Dalarna University's logo and link to the university's website

du.sePublikasjoner
Endre søk
Begrens søket
1234567 1 - 50 of 653
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Abdelmageed, Rana
    Högskolan Dalarna, Institutionen för information och teknik.
    The implementation of a solar photovoltaic park with potential energy storage on SSAB's industrial area and its impact onthe internal electricity system2023Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The global push for increased renewable energy in power production is reshaping how industries approach energy systems. As the urgency to combat climate change grows, industries are integrating alternative power pathways alongside existing systems. This shift is driven by factors such as renewable energy adoption, energy storage advances, decentralization, electrification, circular economy principles, regulatory support, sustainability goals, and technological progress. These changes not only yield economic benefits but also enhance environmental and social impact. Integrating alternative pathways necessitates strategic planning, optimization, and a phased approach for seamless integration. Through these transformations, industries position themselves as sustainability leaders, align with climate goals, and ensure long-term energy security.

    The proposed implementation of a photovoltaic (PV) system at SSAB's steel production plant in Borlänge, specifically for forming line 4's electricity needs, will have a positive impact. This integration introduces renewable energy generation, offsetting the load and reducing reliance on the grid during peak hours, potentially leading to lower costs. It aligns with SSAB's environmental goals by curbing emissions, bolsters energy resilience, and aiding peak demand management. However, challenges in grid integration and infrastructure adjustments must be addressed for successful implementation. Overall, this move embodies SSAB's commitment to sustainability and efficient operations. 

    Through the utilization of simulation tools such as PVsyst and Homer Pro, an extensive study was conducted to investigate diverse scenarios involving combinations of a PV system, hydrogen modules, batteries, and a grid-connected load. The primary aim was to assess the feasibility of these scenarios within the energy system context. By leveraging PVsyst's capabilities for photovoltaic system analysis and Homer Pro's system optimization features, the study comprehensively examines interactions between electricity generation, storage, and consumption. This simulation-driven approach provided valuable insights into the performance dynamics, energy balance, and economic viability of each configuration, aiding in the informed selection of optimal combinations that align with the project's feasibility objectives.

    The results obtained suggest that the ideal size for the PV system in this context is 2.7 MW, allowing for an annual energy generation of 2.5 GWh. The electricity output aligns well with the yearly demand of 2.4 GWh for Forming Line 4

    The results from different scenarios offer valuable insights into how integrating renewable energy and incorporating energy storage affect the overall efficiency and cost-effectiveness of the system. Each scenario was assessed in comparison to the base case of grid connection, uncovering a spectrum of LCOE values. It is noteworthy that the highest LCOE, reaching 0.12 €/kWh, was observed when all renewable resources were combined, whereas the lowest LCOE, at 0.059 €/kWh, was achieved with the PV system-only configuration.

    Fulltekst (pdf)
    fulltext
  • 2.
    Abdilrahim, Ahmad
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Mokhtar, Alsiraira
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    The Impact of an Attention Mechanism on the Representations in Neural Networks, Focusing on Catastrophic Forgetting and Robustness to Input Noise2024Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study explores how attention mechanisms impact representation distributions within neural networks, focusing on catastrophic forgetting and robustness to input noise. We compare Recurrent Neural Network (RNN), Long Short-Term Memory (LSTM), Gated Recurrent Units (GRU), their attention-enhanced counterparts (RNNA, LSTMA, GRUA), and the Transformer model using musical sequences from "Daisy Bell". A key finding is the difference in how these models distribute the information in their representation. Base models like RNN, LSTM, and GRU concentrate information within specific nodes, while attention-enhanced models spread information across more nodes, demonstrating greater robustness to input noise. This is shown by significant differences in performance deterioration between base models and their attention-augmented versions. However, base models such as RNN and GRU exhibit better resistance to catastrophic forgetting compared to their attention-enhanced counterparts. Despite this, attention models show a positive correlation between higher overlap percentages in their representations and improved accuracy for certain tasks, alongside a negative correlation with higher numbers of empty nodes. The Transformer model stands out by maintaining high accuracy across tasks, likely due to its self-attention mechanisms. These results suggest that while attention mechanisms enhance robustness to noise, further research is needed to address catastrophic forgetting in neural networks.

    Fulltekst (pdf)
    fulltext
  • 3.
    Abdulahad, Aziz
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Ohlsson, Martin
    Högskolan Dalarna, Institutionen för information och teknik.
    Analys av fuktsäkerhet hos hybridelement kontra sandwichelement2022Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna studie är ett examensarbete inom byggingenjörsprogrammet på Högskolan Dalarna i Borlänge. Examensarbetet belyser det nya hybridelementet och dess fuktrelaterade egenskaper, samt jämför hybridelement med en gammal beprövad lösning i sandwichelement från fuktperspektiv. Denna studie är av intresse då byggbranschen behöver nya hållbarare lösningar som detta hybridelement erbjuder.

    Syftet med denna studie är att jämföra fukttekniska egenskaper för sandwichelement och hybridelement med hjälp av intervjuer och simulering av hybrid- och sandwichelement i WUFI. Ett vidare syfte är att analysera beteende hos båda element när de utsätts för olika mängder fukt, undersöka eventuella fuktrelaterade problem hos dessa element samt möjligheten att bygga med hybridelement i stället för sandwichelement.

    Studiens resultat bekräftar att hybridelement rent teoretisk är en godtagbar lösning när det kommer till fuktsäkerhet. Samtidigt konstateras av slutsatsen att en god täthet hos en vägg är en viktig parameter men räcker inte alltid för att garantera fuktsäkerheten, utan täthet behöver kompletteras med noggrann projektering och utförande.

    Fulltekst (pdf)
    fulltext
  • 4.
    Adolfsson, Alexander
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Ovesson, Christoffer
    Högskolan Dalarna, Institutionen för information och teknik.
    Utvärdering av sökmotorer i en svensk kontext2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The focus of this study was to evaluate different search engines on Swedish text. Information retrieval is widely used by both people and organizations, and it is important to be able to efficiently retrieve needed information at the right time. The study determined that relevance and speed are the most important factors in search engines. The evaluation measures the precision and recall which are relevance measurements, and speed of two search engines, Elastic search and MarkLogic. The evaluation has determined that there is no significant difference in the relevance of the retrieved results between the engines. The evaluation has also determined that there is a statistically significant difference in speed between the engines, with Elastic search outperforming MarkLogic. Both search engines performed very well in terms of successful searches, meaning to return a relevant document in the first 20 results. Both engines succeeded in fulfilling the information need 96% of the time.

    Fulltekst (pdf)
    fulltext
  • 5.
    Afzali, Faizullah
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Byggteknik.
    Rashid, Renas
    Högskolan Dalarna, Institutionen för information och teknik, Byggteknik.
    Främjande av återbruk av byggmaterial: En kvalitativ studie om branschens uppfattningar kring potentialen hos ekonomiska incitament2023Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna uppsats lyfter fram betydelsen av ekonomiska incitament för att stimulera återanvändning av byggmaterial i Sverige. Trots att byggindustrin ser fördelarna med återanvändning, visar studien att det saknas tillräckliga ekonomiska incitament för att göra det till en standardpraxis. Genom semistrukturerade intervjuer med representanter från byggindustrin och litteraturstudie, identifierade studien flera hinder som kvalitetsgaranti, byggregler, brist på kunskap och ekonomiska utmaningar. Studiens syfte var att undersöka vilka ekonomiska incitament som kunde främja användningen av återanvända byggmaterial och identifiera potentiella hinder för deras implementering. Resultaten tyder på att det för närvarande saknas direkta ekonomiska incitament som uppmuntrar byggföretag till att återanvända byggmaterial. Flera hinder har identifierats, bland annat utmaningar rörande kvalitetsgarantier, byggregler, brist på kunskap och ekonomiska svårigheter. Studien framhåller också att det krävs mer omfattande politiska och ekonomiska initiativ för att stimulera användningen av återanvända byggmaterial. Uppsatsen bidrar till den befintliga forskningen genom att ge rekommendationer till beslutsfattare och andra aktörer inom byggsektorn som är intresserade av att främja hållbarhet och miljövänliga metoder. Den föreslår att framtida forskning bör inriktas på att utforma och testa specifika ekonomiska incitament för att främja återanvändning av byggmaterial. Av studien framkommer det att byggföretag identifierar en mängd hinder och utmaningar vid återanvändning av byggmaterial. Det framkommer även att det finns en märkbar brist på ekonomiska incitament från staten för att främja användandet av återanvända byggmaterial i byggprojekt. Byggföretagen föreslog olika former av ekonomiska incitament som skulle kunna främja användningen av återanvända byggmaterial, inklusive bidrag, skattelättnader och digitala plattformar. Det fanns även en variation i politiska åsikter gällande idén om att införa ekonomiska incitament för att främja återanvändningen av byggmaterial, med en del som stödde idén och andra som motsatte sig den.

    Fulltekst (pdf)
    fulltext
  • 6.
    Ahmad Nia, Pardis
    Högskolan Dalarna, Institutionen för information och teknik.
    Shading and natural ventilation, addressing indoor overheating in the present and future through the case study of Bysjöstrand eco-village2021Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Climate change temperatures expected to rise and extreme heat events (HW) canbe intensified. The influence of climate change on the built environment willbecame more apparent over the coming years. For example, there would be ashift in the risk of overheating in buildings, as well as the cooling and heatingneeds.Studies found that design strategies used to optimize buildings for winter like:good thermal insulation, high airtightness, and extra heat gains increase the riskof overheating. Thus, because of climate change, there is a need for checking thebuildings for summer conditions even in heating dominated countries.This study aims to investigate the potential of two main passive design strategiesto mitigate indoor overheating: ventilation and shading. The main focus of thisstudy is on single-family homes within the Swedish context. Bysjöstrand EkobyAssociation’s Bysjöstrand eco-village project is used as case study. 30 singlefamilyhomes are simulated using Honeybee to run EnergyPlus for calculatingindoor mean air temperature values, extracting the number of hour andpercentages of overheating for each building.Six alternative scenarios were used to evaluate the eco-village. The firststructures were assessed to determine the hours and percentage of time spentoverheating in the present and future situations. The second scenarios, whichinvolved utilizing natural ventilation, was tested to determine if and to what extentit can help to reduce the overheating risk in present and future.A combination of natural ventilation and shading was used for the last scenariosboth for current and future climate.According to the findings, natural ventilation has the greatest influence in reducingoverheating. Combining these two strategies in 2020 and 2070 can lower theaverage percentages of overheating from 17.5 % to 0.6 % and 52.8 % to 12.4%,respectively.The majority of the overheating risk may be addressed using passive strategies,based on the results. More detailed building design is likely be able to eliminateoverheating in single family homes, however, as this study showed it is importantto consider passive strategies from the early stage on the design process.

    Fulltekst (pdf)
    fulltext
  • 7.
    Ahmed, Omar
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Kelli, Philip
    Högskolan Dalarna, Institutionen för information och teknik.
    Analysing recommended content provided by YouTube and users preferences: A Case Study at Dalarna University in Sweden2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The application YouTube released in 2005 is today known as the most prominent platform on the world wide web for sharing, creating, and discovering video content(s). By utilizing technology trends such as Machine learning, YouTube can take advantage of algorithms such as deep neural networks to entice the users with a massive amount of personalized recommended content(s)t to watch based on the user's data.

    The algorithm in the YouTube recommendation system collects the users' personalized data such as location, watch history and search history to recommend video content. The YouTube recommendation system gives personalized recommended content(s) to a YouTube user with the collected data. The user may deem the recommended content as ethically wrong. Therefore, bring up meaningful discussions such as a YouTube consumer's sentiment towards those contents they deem unethical.

    This research study examines what ethical challenges exist in the YouTube recommendation system and how those challenges affect the YouTube consumers trust in the recommendation system.

    • The research questions that were examined in this study are: What kind of ethical challenges does the YouTube recommendation system have?

    • What kind of impact do those ethical challenges have on the user’s trust in the YouTube recommendation system?

    The respondents consisted of students at Dalarna University. This research was conducted with semistructured interviews and a questionnaire that consisted of 11 questionnaires.

    By examining the results from the literature reviews, interviews, and questionnaire, the gathered results show that challenges such as inappropriate, misinformed content and privacy exist with the YouTube recommendation system. Numerous of our respondents felt like they did not trust the YouTube recommendation system with their personalized data, primarily because of receiving video content that is not relevant, which has made some of the respondent question what YouTube does with the influx of the individual data.

    Based on the result it can be concluded that there are many concerns related to ethical issues in the YouTube recommendation system. In essence, the respondents highlighted the significance of privacy when using a platform such as YouTube. The respondents desired more transparency with their data.

    Fulltekst (pdf)
    fulltext
  • 8.
    Akhras, Samir
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Alkhalil, Bashar
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Optimizing Workspace Comfort and Efficiency: A Comparative Analysis of Displacement Ventilation and Mixed Ventilation strategies in Landscape Offices, considering Thermal Comfort, Air Quality, Energy Performance, and Life Cycle Assessment in HVAC Design2024Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Purpose: This study conducts a comparative analysis of Displacement Ventilation (DV) and Mixed Ventilation (MV) strategies in landscape offices, considering thermal comfort, indoor air quality, energy performance, and life cycle assessment (LCA) in HVAC design. Methods: IDA-ICE 5 software was used for air stratification analysis of the indoor environment, Magi-CAD for ventilation system design, One Click LCA for calculating the environmental impact, hand calculations and an extensive literature review. Results: The energy performance simulations indicate that DV is more energy efficient than MV. This efficiency is largely attributed to the higher heat exchange capacity of the DV system´s air handling unit, benefiting from the stratification of indoor air temperatures, because for the DV case, the exhaust air temperature is higher than in the MV system, enabling more effective heat recovery. Conversely, the MV system exhibit a more homogeneous air temperature distribution, resulting in a lower exhaust air temperature and consequently less effective heat recovery. Additionally, the supply air temperature for MVS is lower (16°C) than DVS (19°C), leading to increased energy consumption for indoor heating. Regarding environmental impact, the LCA results from stages A1 to A5 (“cradle to practical completion”) show that DVS has a higher Global Warming Potential (GWP) compared to MVS. However, when considering the complete LCA (“cradle to grave”), including energy consumption over the entire lifespan, DVS has a lower GWP than MVS. This outcome is due to the operational energy efficiency of DV, leading to a lower overall environmental impact over the system´s lifetime. Sensitivity analysis confirms also that DV has a lower overall environmental impact, even when accounting for future climate scenarios. Regarding indoor air quality, DV delivers better indoor air quality for the same airflow rate compared to the MV system. MVS requires a higher airflow rate to meet the WELL Building Standard's CO2 level requirements, leading to higher energy consumption and global warming potential. Thus, the DV system maintain better indoor air quality at lower airflow rates, contributing to greater energy efficiency and reduced environmental impact. However, MV systems demonstrate better performance in thermal comfort. The homogeneous air distribution of MV systems results in lower Predicted Percentage of Dissatisfied (PPD) values, enhancing overall occupant comfort. In contrast, DV systems' air temperature stratification characteristics result in cooler temperatures at the floor level, increasing PPD values, and decreasing thermal comfort, particularly in the summertime when temperature differences are more pronounced. Conclusion: DV is more energy-efficient due to higher heat recovery from stratified air temperatures. DV is more environmentally friendly over its lifespan due to lower operational energy use. DV provides better air quality at lower airflow rates, reducing energy consumption and GWP. MV offers a slightly better thermal comfort with more uniform air distribution.

    Fulltekst (pdf)
    fulltext
  • 9.
    Aldrin, Marcus
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Costello, Glenn
    Högskolan Dalarna, Institutionen för information och teknik.
    Wiklundh Engqvist, Mia
    Högskolan Dalarna, Institutionen för information och teknik.
    Studenters uppfattning av sin programtid: En fallstudie på kandidatprogrammet Informationsdesign2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Bakgrund Enligt lärare för en högskoleutbildning för en generell examen finns ett upplevt återkommande problem med att studenter som läser ett treårigt kandidatprogram inte förstår hur kurser hänger ihop med varandra och att kurser kan vara behörighetsgivande. Hur ser egentligen problemet ut ur studenters perspektiv? Kan det som lärare beskriver bekräftas av studenter? Hur ser de på sin programtid, hur tar de till sig information om sina studier och hur skulle de vilja få den informationen?

    Syfte Syftet med forskningsstudien är att bidra med kunskap om vilken typ av information studenter vid en högskoleutbildning behöver under sin programtid. Studiens två frågeställningar är: Vilken information behöver studenter för att de ska förstå sin egen programtid? Hur kan lärosäten utforma information för att stödja studenters förståelse för sin egen tid vid programmet?

    Metod Metoderna för insamlande av empiri var enkät, semistrukturerade intervjuer och dokumentanalys. De tre årskurserna på Informationsdesignprogrammet vid Högskolan Dalarna tillsammans med dokument som studiehandledningar, kursplaner, utbildningsplan och informationssidorna som finns tillgängliga för studenterna, har utgjort empirin för studien. Totalt utfördes sju intervjuer med studenter från dessa årskurser.

    Resultat Studien identifierade två huvudsakliga teman i relation till hur studenterna uppfattade programmet, ”Kontext/Identitet” och ”Förståelse/Relevans”. Återkommande uttryck för oförståelse av hur programmets innehåll hänger samman och en osäkerhet kring dess slutmål.

    Slutsatser Studenter behöver att utbildningens innehåll kopplas till programmets slutmål och mot kommande arbetsliv. Programmet upplevs som väldigt brett och svårt att greppa och att vissa kurser behöver en tydligare relevans för att öka förståelsen, engagemanget och motivationen. Studiehandledningen är ett centralt dokument som borde delvis standardiseras och innehålla specifik information. En interaktiv lösning över programmet med filtreringsfunktion behövs. 

    Fulltekst (pdf)
    fulltext
  • 10.
    Al-Dulaimy, Auday
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Informatik. Mälardalen University.
    Ashjaei, M.
    Behnam, M.
    Nolte, T.
    Papadopoulos, A. V.
    Fault Tolerance in Cloud Manufacturing: An Overview2023Inngår i: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, Springer Science and Business Media Deutschland GmbH , 2023, s. 89-101Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Utilizing edge and cloud computing to empower the profitability of manufacturing is drastically increasing in modern industries. As a result of that, several challenges have raised over the years that essentially require urgent attention. Among these, coping with different faults in edge and cloud computing and recovering from permanent and temporary faults became prominent issues to be solved. In this paper, we focus on the challenges of applying fault tolerance techniques on edge and cloud computing in the context of manufacturing and we investigate the current state of the proposed approaches by categorizing them into several groups. Moreover, we identify critical gaps in the research domain as open research directions. © 2023, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

  • 11.
    Al-Hammadi, Mustafa
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Fleyeh, Hasan
    Högskolan Dalarna, Institutionen för information och teknik, Datateknik.
    Åberg, Anna Cristina
    Högskolan Dalarna, Institutionen för hälsa och välfärd, Medicinsk vetenskap.
    Halvorsen, Kjartan
    Högskolan Dalarna, Institutionen för hälsa och välfärd, Medicinsk vetenskap.
    Thomas, Ilias
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Machine Learning Approaches for Dementia Detection Through Speech and Gait Analysis: A Systematic Literature Review2024Inngår i: Journal of Alzheimer's Disease, ISSN 1387-2877, E-ISSN 1875-8908, Vol. 100, nr 1, s. 1-27Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    BACKGROUND: Dementia is a general term for several progressive neurodegenerative disorders including Alzheimer's disease. Timely and accurate detection is crucial for early intervention. Advancements in artificial intelligence present significant potential for using machine learning to aid in early detection.

    OBJECTIVE: Summarize the state-of-the-art machine learning-based approaches for dementia prediction, focusing on non-invasive methods, as the burden on the patients is lower. Specifically, the analysis of gait and speech performance can offer insights into cognitive health through clinically cost-effective screening methods.

    METHODS: A systematic literature review was conducted following the PRISMA protocol (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). The search was performed on three electronic databases (Scopus, Web of Science, and PubMed) to identify the relevant studies published between 2017 to 2022. A total of 40 papers were selected for review.

    RESULTS: The most common machine learning methods employed were support vector machine followed by deep learning. Studies suggested the use of multimodal approaches as they can provide comprehensive and better prediction performance. Deep learning application in gait studies is still in the early stages as few studies have applied it. Moreover, including features of whole body movement contribute to better classification accuracy. Regarding speech studies, the combination of different parameters (acoustic, linguistic, cognitive testing) produced better results.

    CONCLUSIONS: The review highlights the potential of machine learning, particularly non-invasive approaches, in the early prediction of dementia. The comparable prediction accuracies of manual and automatic speech analysis indicate an imminent fully automated approach for dementia detection.

    Fulltekst (pdf)
    fulltext
  • 12.
    Ali, Marwan
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Narani, Eema Sheykhi
    Högskolan Dalarna, Institutionen för information och teknik.
    Optimizing the Performance and Efficiency of District Heating Substations: A Study of the Cooling Process and Overall System Improvements in Ludvika2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The concept of future sustainability is driving efforts toward the efficient improvement of energy systems. District heating systems play a key role in balancing the energy system by improving performance and flexibility. As system efficiency increases, fuel consumption decreases, resulting in reduced greenhouse gas emissions and mitigating potential climate impacts, especially when using fossil fuels. In Sweden, district heating has shown significant growth, with a 75 % increase in total heat production over the last 30 years. Furthermore, carbon dioxide emissions have been reduced by approximately 50 % for each delivered kWh in the past 20 years, while renewable energy sources have doubled in the district heating sector. This thesis focuses on optimizing the cooling process to achieve lower return temperatures and higher system efficiency. It also emphasizes the importance of implementing an efficient heat consumption strategy to reduce peak loads and improve overall system efficiency. This approach involves managing demand to minimize peak heat requirements and distribute the load evenly throughout the day, leading to a more resource-effective and efficient system. The case study examines district heating supplied by VB Energy to Ludvikahem AB buildings, using data from Dec 2022 to Jan 2023. Quantitative data from district heating substations and the district heating plant are collected and analyzed to generate qualitative insights. The study proposes theoretical optimization measures based on the findings. The evaluation of substation performance reveals 20 poorly performing substations with various issues. Eight of these substations have technical problems related to substation components, while another eight experience management issues not aligned with specific activity profiles. The load shifting simulation demonstrates a 3% reduction in heat rate peak levels, resulting in approximately 7 kW of subscribed heat rate savings. Energy usage savings reach approximately 0.9%, leading to an increase in energy usage effectiveness. The cost savings amounted to about 3000 SEK over two months for a single building. This research emphasizes the importance of routine control, inspection, and documentation of substation performance to ensure optimal efficiency. Furthermore, indicates that the poorly performing substations that contribute to inefficiencies in the district heating network. Additionally, real-time regulation and load-shifting strategies are vital for optimizing customer consumption and maintaining an efficient district heating system, benefiting both suppliers and consumers.

    Fulltekst (pdf)
    fulltext
  • 13.
    Ali, Yalda
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Gunnarsson Sahlberg, Jonas
    Högskolan Dalarna, Institutionen för information och teknik.
    Förändringar och effekter efter implementering avRPA i mindre svenska kommuner2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Robotic Process Automation (RPA) är en bred variation av tillvägagångssätt och tekniska lösningar som arbetar som ett stöd för att automatisera repetitiva arbetsuppgifter. År 2017 fastslogs en ny lagstiftning i Sverige som möjliggjorde för den offentliga sektorn att automatisera beslutstöd. Detta ledde i sin tur att allt fler svenska kommuner började implementera RPA. Av Sveriges totalt 290 kommuner klassas 259 stycken som mindre kommuner. För dessa mindre kommuner är det viktigt att balansera mellan att ha tillräckligt mycket bemanning för att både klara av ekonomin samt arbetsuppgifterna. Dessutom har flera kommuner i Sverige inte råd att anställa ny personal på grund av den rådande pandemin. Flertalet av dessa mindre kommuner har ännu ej påbörjat sitt arbete med RPA.

    Studien undersöker sex mindre svenska kommuner som har implementerat RPA med syfte för att ta reda på de effekter och förändringar som uppstått efter implementationen. Detta har gått till genom semistrukturerade intervjuer, för att få reda på hur kommunens implementering gått till, vilka processer och inom vilka områden kommunen har valt att automatisera samt vad kommunen har sett för effekter av detta. Tematisk analys användes sedan för att hitta mönster samt teman i intervjuerna.

    Resultatet visade på lyckade implementeringar där kommunerna har kommit olika långt i sitt arbete och nått olika nivåer av framgång men där samtliga genom RPA har frigjort tid för sin amedarbetare. De medverkande kommunerna i studien har ett flertal nya processer att automatisera i planeringsstadiet för det kommande året.

    Slutsatsen av denna studie visar på att effekterna av RPA ger goda resultat genom att frigöra tid och effektivisera arbetet för de mindre kommuner som har valt att lägga ner resurser på det. I brist på andra sätt att lösa sina nuvarande problem, är RPA i dagsläget en metod för att balansera ekonomi och de växande utmaningarna för en mindre kommun.

    Fulltekst (pdf)
    fulltext
  • 14.
    Aljifri, Ahmed
    Högskolan Dalarna, Institutionen för information och teknik.
    Predicting Customer Churn in a Subscription-Based E-Commerce Platform Using Machine Learning Techniques2024Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This study investigates the performance of Logistic Regression, k-Nearest Neighbors (KNN), and Random Forest algorithms in predicting customer churn within an e-commerce platform. The choice of the mentioned algorithms was due to the unique characteristics of the dataset and the unique perception and value provided by each algorithm. Iterative models ‘examinations, encompassing preprocessing techniques, feature engineering, and rigorous evaluations, were conducted. Logistic Regression showcased moderate predictive capabilities but lagged in accurately identifying potential churners due to its assumptions of linearity between log odds and predictors. KNN emerged as the most accurate classifier, achieving superior sensitivity and specificity (98.22% and 96.35%, respectively), outperforming other models. Random Forest, with sensitivity and specificity (91.75% and 95.83% respectively) excelled in specificity but slightly lagged in sensitivity. Feature importance analysis highlighted "Tenure" as the most impactful variable for churn prediction. Preprocessing techniques differed in performance across models, emphasizing the importance of tailored preprocessing. The study's findings underscore the significance of continuous model refinement and optimization in addressing complex business challenges like customer churn. The insights serve as a foundation for businesses to implement targeted retention strategies, mitigating customer attrition, and promote growth in e-commerce platforms.

    Fulltekst (pdf)
    fulltext
  • 15.
    Alkhuder, Juma
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Alnabhani, Mazen
    Högskolan Dalarna, Institutionen för information och teknik.
    A comparative study of the materials of Villa Zero project using LCA2021Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    In this thesis a future-world case was undertaken of the life cycle assessment (from cradleto grave) of a single-family house. The house is expected to be constructed by the end of2021 in Borlänge, a city located in Dalarna County. The aim of this study is to investigatewhether the building materials in external walls and roof surpass in terms ofenvironmental impacts compared with other building materials suggested by the authorsof this thesis.Six scenarios were evaluated in terms of the environmental impacts for two buildingelements, external wall, and roof. A base case scenario is taken into consideration foreach building element, considering the fact, that the thermal performance characteristicsof the building materials are comprehensively provided. Consequently, four scenarios aredetermined by the authors.One Click LCA program was used to calculate the environmental impacts of thebuilding materials through the lifecycle of the house during a time horizon of 50 years.Hemp fiber insulation material is planned to be used in the external walls; thus, it isconsidered the baseline case for this thesis. The first study is corresponded to the externalwalls, and it was found that glass wool insulation is more environmentally friendly thanhemp fiber and rock wool insulation.Wood material is planned to be used in the roof; thus, it is considered the baseline casefor this thesis. The second study is corresponded to the roof, and it was found that woodmaterial is more environmentally friendly than concrete and steel.Therefore, the suggested material by the authors surpasses the baseline case materialenvironmentally in respect of external walls, but this was not the case regarding the roof.

    Fulltekst (pdf)
    fulltext
  • 16.
    Allabwani, Yassin
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Almefrej, Mohamed
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    CyberSafe in Action: A comparative study of knowledge enhancement in cybersecurity among Swedish university students before and after interacting with an interactive digital prototype2024Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Amidst escalating cyber threats, the necessity for robust cybersecurity education is more pressing than ever, particularly within university environments that are increasingly targeted. This study, "CyberSafe in Action," evaluates the effectiveness of an interactive digital prototype designed to enhance cybersecurity awareness among Swedish university students. Through a mixed-methods approach, combining quantitative pre- and post-intervention quizzes with qualitative interviews, the study assesses the prototype's impact on students' cybersecurity knowledge and behavioral intentions.The research involved 20 participants divided into an experimental group, which interacted with the prototype, and a control group, which did not. Results indicated a significant improvement in cybersecurity awareness in the experimental group, with average quiz scores increasing from 16.2 to 24.8, representing a 40.9% improvement in cybersecurity knowledge. In contrast, the control group experienced a decline in scores from 17.1 to 13.1, indicating a -25.6% change. Statistical analysis using paired and independent t-tests confirmed these enhancements were significant (p<0.01), demonstrating the prototype’s efficacy. Qualitative feedback highlighted increased engagement and a proactive approach to cybersecurity, affirming the benefits of interactive educational tools. This study contributes to pedagogical practices by demonstrating that interactive, problem-based learning can substantially enhance cybersecurity education. Recommendations for future research include larger-scale studies to explore long-term retention of knowledge and behavioural changes. This study underscores the critical role of innovative educational strategies in preparing students to navigate and secure increasingly digital landscapes effectively.

    Fulltekst (pdf)
    fulltext
  • 17.
    Almlof, Erik
    et al.
    KTH Royal Inst Technol.
    Zhao, Xiaoyun
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys. KTH Royal Inst Technol.
    Pernestal, Anna
    KTH Royal Inst Technol.
    Jenelius, Erik
    KTH Royal Inst Technol, Div Transport Planning, Stockholm, Sweden..
    Nybacka, Mikael
    KTH Royal Inst Technol.
    Frameworks for assessing societal impacts of automated driving technology2022Inngår i: Transportation planning and technology (Print), ISSN 0308-1060, E-ISSN 1029-0354, Vol. 45, nr 7, s. 545-572Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Numerous studies have studied the impacts of automated driving (AD) technology on e.g. accident rates or CO2 emissions using various frameworks. In this paper we present an overview of previous frameworks used for societal impacts and review their advantages and limitations. Additionally, we introduce the Total Impact Assessment (TIA) framework developed by the Swedish Transport Administration and use this framework to evaluate three scenarios for AD bus services in Stockholm. We conclude that the reviewed frameworks cover different aspects of AD technology, and that e.g. cybersecurity and biodiversity are areas largely neglected. Furthermore, most frameworks assume effects to be homogenous, when there may be large variation in e.g. perceived security. The TIA framework does not manage to include all societal aspects of AD technology, but has great benefits and manages to provide important insights of the societal impacts of AD technology, especially how effects may wary for different actors.

    Fulltekst (pdf)
    fulltext
  • 18.
    Alsbäck, Linda
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Landin, Emelie
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Maximizing Solar Potential: Estimating The Solar Energy Production on Falun's Roofs2024Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    The study aimed to prepare for future software to estimate the solar energy production on rooftops by establishing specific criteria and developing a method to estimate the solar energy potential for PV systems on rooftops. The research initiated with a comprehensive literature review and the gathering of geographical data which proceeded in parallel. To verify the study's findings, an existing roof were studied. The developed method involves converting the total roof area into the annual solar energy production output, which is visually represented in a flowchart. The method starts by adjusting the total roof area using LiDAR data and adhering to building regulations and guidelines concerning solar- and architectural suitability. The suitable area is then further refined into usable area based on the dimensions and installation requirements of the PV panels. The final step in the method calculates the solar energy production of the PV system considering the location and specific system conditions. This method was tested on an existing building to verify the results. The calculations indicated that 39% of the total roof area was suitable for horizontal (landscape)-oriented panels, producing an annual solar energy output of 6,900 kWh/year. For vertical (portrait)-oriented panels, 32% of the total roof area was applicable, yielding an annual solar energy production of 5,800 kWh/year. The study's conclusion highlights that criteria include distances from obstacles and solar viability. Integrating various geographical data would enhance the accuracy of solar energy production estimation, when planning PV panel installations. Future software should incorporate visualisation features representing physical barriers and shading elements that may prevent PV installations, as well as safety distance regulatory.

    Fulltekst (pdf)
    fulltext
  • 19.
    Amin, Solin
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Hellström, Johan
    Högskolan Dalarna, Institutionen för information och teknik.
    Can ChatGPT Generate Code to Support a System Sciences Bachelor’s Thesis?2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Background ChatGPT is a chatbot released in November 2022. Its usage has grown to include being used in academia and for scientific writing, with varying results. We investigate if ChatGPT can be used for the technical part in a Bachelor’s thesis in System Sciences.

    Aim We evaluate if it is possible to generate the code for detecting potential gender bias in previous responses from ChatGPT, in the form of a dialogue.

    Method We use an exploratory case study where an iterative dialogue with ChatGPT is used to generate Python code to be able to analyse previous responses made byChatGPT. The methods for development were chosen by the authors from suggestions by ChatGPT.

    Results Two separate dialogues resulted in a program that combined a fine-tuned Natural Language Processing model together with sentiment analysis and word frequency analysis. The program successfully identified responses in the dataset as having a female or male gender bias or being gender neutral.

    Conclusions ChatGPT serves as a powerful tool for coding, although it currently falls short of being a one-stop solution that can generate code sufficient for more complex tasks witha single prompt. Our experience suggests that ChatGPT accelerates one’s work when the user possesses some programming knowledge. With further development, ChatGPT could transform coding workflows and increase productivity in related fields.

    Implications ChatGPT as a tool is very capable in supporting students in the technical aspect of a Bachelor’s thesis and it is not unreasonable to assume that it works in other contexts, as well. As such, one can achieve more with the tool than without, and consequently it would be for the better to integrate ChatGPT into thesis work. This stresses the point that we need to find better regulations for cheating and plagiarism.

    Fulltekst (pdf)
    fulltext
  • 20.
    Andersdotter, Julia
    Högskolan Dalarna, Institutionen för information och teknik.
    Improvement of an electrical coupler cover2022Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study was made for Dellner Couplers and is regarding a development of their electrical coupler cover (ECC).

    The electrical coupler includes several electrical contacts where the current flows, which lets electrical signals to be transported between all carriages in a train when the electrical couplers are connected to each other. An electrical coupler that is not connected to another one will have an ECC that automatically folds down in in front of the coupler to protect the electrical contacts from dust, water, and damage. The current ECC Dellner Couplers have today is made from an extruded aluminium profile, which has desirable properties in all aspects, except that it’s conductive.

    If the ECC encounter the electrical contacts, which can happen during a collision between the train and an animal, the contact between them could cause short circuit since the electricity is always running and can’t be turned off. The development of the ECC is aimed to remove the occurrence of short circuit in case of collision with an animal, but still fulfil the mechanical requirements.

    The method used to find a solution was based around well know concept development methods involving problem identification, identifying customer needs to create a target specification on what the ECC must fulfil, search for external and internal ideas for solving similar problems, performing concept screening on several concept ideas, and implement a finite element analysis (FEA) on the final concepts to see which one has the best potential for success. A part of the focus in the method has also been around material exchange by searching for potential materials in a material database.

    The results imply that adding thickness to the extruded aluminium profile could be a promising concept, which was discovered in the concept screening and FEA. The FEA of the concept shows lower displacement of the ECC and a decrease of stress level of about 57% compared to the original when being exposed to 10kN, and the result in displacement is ¼ of the original concept when being exposed to 100kN.

    The conclusion of this work is that a significant improvement can be made by adding thickness to the cross-section, but it is limited by the strength of the screws and the attachment. The ECC can handle up to 100kN before it will reach the electrical contacts, but the screws can only endure up to 53kN before they rupture. The screws and the attachment are the ones limiting what the electrical coupler can handle, but if the real force of an impact is below 53kN, this solution could be seen as acceptable in terms of the strength.

    The concept also involves a significant addition of weight and space required. The weight (+2,4kg) needs to be examined so it doesn’t affect other parts of the coupler negatively, and evaluation needs to be done to find out if the space required (+12mm at the center of the ECC) is available and that the meeting electrical couplers won’t collide in each other when connecting.

    A suggestion is to focus on the avoidance of short circuit, rather than the avoidance of reaching the electrical contacts. A more potential solution could potentially be found in a protective coating, which will allow the ECC to deform and not exhaust the screws and the attachment as much. The thicker and stronger geometry of the ECC will set higher requirements for the screws and the attachment. 

  • 21.
    Andersen, Martin
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik. Dept. of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg.
    Bales, Chris
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik.
    Dalenbäck, J. -O
    Economic Analysis of Heat Distribution Concepts for a Small Solar District Heating System2022Inngår i: Energies, E-ISSN 1996-1073, Vol. 15, nr 13, artikkel-id 4737Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One challenge in today’s district heating systems is the relatively high distribution heat loss. Lowering distribution temperatures is one way to reduce operational costs resulting from high heat losses, while changing the distribution system from steel pipes to plastic pipes and changing the heat distribution concept can reduce investment costs. The result is that the overall life cycle cost of the district heating system is reduced, leading to the improved cost competitiveness of district heating versus individual heating options. The main aim of this study was to determine the most cost-efficient distribution system for a theoretical solar district heating system, by comparing the marginal life cycle cost of two different distribution systems. A secondary aim was to determine the influence of the employed pipe type and insulation level on the marginal life cycle cost by comparing detailed economic calculations, including differences in pipe installation costs and construction costs, among others. A small solar-assisted district heating system has been modeled in TRNSYS based on a real system, and this “hybrid” model is used as a basis for a second model where a novel distribution system is employed and the heating network operating temperature is changed. Results indicate that a novel distribution concept with lower network temperatures and central domestic hot water preparation is most efficient both from an energy and cost perspective. The total life cycle costs vary less than 2% for a given distribution concept when using different pipe types and insulation classes, indicating that the investment costs are more significant than operational costs in reducing life cycle costs. The largest difference in life cycle cost is observed by changing the distribution concept, the novel concept having approximately 24% lower marginal life cycle cost than the “hybrid” system. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

    Fulltekst (pdf)
    fulltext
  • 22.
    Andersen, Martin
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik. Chalmers University of Technology, Gothenburg.
    Bales, Chris
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik.
    Dalenbäck, Jan-Olof
    Chalmers University of Technology, Gothenburg.
    Heat distribution concepts for small solar district heating systems – Techno-economic study for low line heat densities2022Inngår i: Energy Conversion and Management: X, E-ISSN 2590-1745, Vol. 15, artikkel-id 100243Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The high operating temperatures in today’s district heating networks combined with the low energy demand of new buildings lead to high relative network heat losses. New networks featuring lower operating temperatures have reduced relative heat losses while enabling an increase in the use of solar heat. The primary aim of this study was to determine if a particular district heating system can be made more effective with respect to heat losses and useful solar energy, by considering different distribution concepts and load densities. A small solar assisted district heating system with a novel hybrid distribution system has been modelled based on a real case study. This model serves as a basis for two other models where the distribution system and heating network operating temperature is changed. A secondary aim of the study was to determine the economic implications of making these changes, by using costs estimates to calculate the contribution of essential system components to total system cost. Results indicate that a novel distribution concept with lower network temperatures and central domestic hot water preparation is most energy efficient in a sparse network with a heat density of 0.2 MWh/m∙a and a performance ratio of 66%, while a conventional district heating system performs worst and has a performance ratio of less than 58% at the same heat density. In an extremely sparse network with heat density of 0.05 MWh/m∙a, the performance ratio is 41% and 30% for these systems, respectively. A simple economic analysis indicates that the novel distribution concept is also best from an economic point of view, reducing the initial investment cost by 1/3 compared to the conventional concept, which is the most costly. However, more detailed calculations are needed to conclude on this.

    Fulltekst (pdf)
    fulltext
  • 23.
    Andersson, Anna
    Högskolan Dalarna, Institutionen för information och teknik.
    Faktorer som upplevs som hinder för nyttjandet av kollektivtrafiken: Mellan Falun och Borlänge2024Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study takes its point of departure in the 1950s when the car became more accessible to the public and its impact on the use of public transport. There are many positive aspects to using public transport which in turn lead to better sustainability, reduced carbon dioxide emissions and other societal factors. Despite these advantages, this study addresses several obstacles such as distance, travel times and safety aspects as reasons for travelers to opt out of means of transport such as public transport. The purpose of the study is to investigate and understand the obstacles that affect commuters' choice of means of transport between Falun and Borlänge, with a focus on the reasons that lead to some commuters opting out of public transport as a means of transport. The study has used qualitative interviews to bring out themes such as limitations and time aspects, which are some of the aspects that influence the choice of means of transport. The study focuses on finding out the obstacles that influences commuters to opt out of public transport to travel betweenFalun and Borlänge. The discussion part of the study also addresses how individual behaviors and preferences affect the choice of means of transport.

    Fulltekst (pdf)
    fulltext
  • 24.
    Andersson, Daniel
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Warnerfjord, Alexander
    Högskolan Dalarna, Institutionen för information och teknik.
    Påbyggnad med förstärkningstomme i befintlig byggnad: Konstruktionsval för invändig förstärkningsstomme av trä2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Sveriges kommuner har under lång tid rapporterat om en ökande bostadsbrist ilandet. För att motverka bristen behöver en nybyggnation av 60 000–70 000bostäder genomföras årligen fram till 2029. På 60-70 talet stod Sverige även dåinför stora utmaningar som följd av urbaniseringsvågen från Sveriges landsbygdtill städerna. Resultatet blev att bygga storskaligt på ett industriliknandetillvägagångsätt och konsekvenserna till detta blev att stora grönområden runtstäderna exploaterades för att ge plats för nya bostadsområden. För att inte upprepahistorien igen kan ett alternativ istället vara att förtäta en redan befintlig stadsmiljömed exempelvis påbyggnader.I en redan befintlig stadskärna finns många olika typer av byggnader, detta betyderockså att det finns lika många olika typer av påbyggnader. Syftet med detta arbeteär: för ett referenshus beläget i centrala Falun, titta på ett alternativ för påbyggnad iträ där stommen på det befintliga huset inte belastas ytterligare. Ett syfte medarbetet är därför också att bidra till en kunskapsökning kring ämnet påbyggnader iträ.Byggnaden som arbetet har utgått ifrån är beläget i centrala Falun och är uppförtunder slutet av 60-talet. Påbyggnaden som tagits fram för projektet är av”lättbyggnadsteknik” medan förstärkningsstommen bygger på enmassivträkonstruktion i form av pelare och balkar. Anledningen till att använda sigav ett referensobjekt är för att ge arbetet en verklighetsförankring och enkonstruktion att förhålla sig till vid analys av pelarplaceringar. Dimensionering avpåbyggnad samt förstärkningsstommen är utförd med handberäkningar somgrundar sig i de gällande konstruktionsregler som finns i Sverige, Eurokod ochEKS. Byggnaden har även modellerats i Revit för att ge en illustration överpåbyggnaden med förstärkningstomme ser ut men även byggnaden i sin helhetefter påbyggnaden.Resultatet för förstärkningsstommen liknar i mycket ett “trä8” system. Pelare ochbalkar tar upp dom vertikala lasterna medan den befintliga stommens bjälklag,väggar och trapphus i betong bidrar till stomstabiliteten. Genom ritningsanalysenav den befintliga byggnaden har pelarnas placering i konstruktionen valts utefterolika parametrar. Balkarna som placeras på pelartopparna har sedan kontrolleratsför de aktuella spännvidderna med den gällande lasten från påbyggnadenshandberäkningar. Resultatet och slutsatsen som har kunnat dragits från arbetet äratt den kritiska delen för en sådan påbyggnad är balkarna placerade påpelartopparna och inte pelarna i sig själv. Dimensionerna på dessa balkar blirdirekt styrande för hur många våningar som är möjliga att bygga på de placeradepelarna. Även hur mycket påbyggnaden väger har en inverkan på antal pelare ochdärför också spännvidder för balkarna placerade på pelarna.

    Fulltekst (pdf)
    fulltext
  • 25.
    Andersson, Evelina
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Jansson, Felix
    Högskolan Dalarna, Institutionen för information och teknik, Energisystem i byggd miljö.
    Comparative Life Cycle Analysis of a Swedish Row House Construction: New Concrete vs. Timber Frame vs. Reused Concrete Elements2024Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    The building and construction sector is transitioning from a linear to circular economy to meet the global climate goals set by the Paris Agreement. Historically, most GHG emissions from buildings occurred during the user phase. In Sweden, heating emissions have decreased over the past 20 years, but construction and renovation emissions remained consistent. As operational energy efficiency improves, embodied GHG emissions now play a larger role in a building’s total life cycle emissions. A majority of the emissions occurs in the production of structural elements in addition to waste generation. One way to lowers both waste and production emissions is using reused materials. The purpose of the study is to assess the climate impact of a rowhouse in Drottninghög, by comparing the global warming potential (GWP) of three structural options: 1. Reused concrete 2. Traditional concrete 3. Light timber construction. The goal is to determine the most climate friendly option and provide valuable insights for future projects within the industry. This is a case study which focuses on comparing the GWP that is given by the Life cycle analysis (LCA) of each case. The results from the LCA shows that reused concrete has the lowest GWP, followed by the option with timber construction. Exchanging the new concrete structure to a reused concrete structure can reduce the GWP by 77%, and by 52% for the timber construction. This suggests that reused concrete can even be considered a competitive alternative to the traditional timber construction for this type of buildings. The construction sector must become more sustainable to reach climate goals. Reusing concrete structural elements is shown in this study to be a good solution to decrease the GHG in the production phase in comparison to timber construction and new concrete structure.

    Fulltekst (pdf)
    fulltext
  • 26.
    Andersson, Jens
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Berg, Marcus
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Klassificering av refuger baserat på spatiala vektorpolygoner i vägnät: En fallstudie om utmaningar och lösningar till att klassificera företeelser till det norska vägnätet2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Geografiska informationssystems användning blir allt viktigare i dagens samhälle där spatiala data kan lagras, hämtas, analyseras och visualiseras. Genom att sammanställa spatiala data kan en bild av verkligheten abstraheras. Detaljerad information om vägnat och företeelser (refuger, bullerplank, skyltar etcetera) för analys leder till ett effektivare drift- och underhållsarbete. Vilket i sin tur ger en ökad framkomlighet för trafikanter. Teknikföretaget Triona har en kartapplikation där utmaningar har uppstått gällande algoritmisk knytning av inmätta refuger (benämnd Norge-datasamlingen) till det norska vägnatet. En refug ar en upphöjning i gatan som avgränsar körfalt och påminner om en trottoar i utseendet. Denna fallstudie behandlade ett delproblem där klassificering av refuger skulle kunna underlätta knytningen och förutsättningarna for analys. Syftet med studien kan sammanfattas till att presentera förslag på metoder for att klassificera refugerna med övervakad maskininlärning. Med algoritmerna K-nearest neighbors (KNN) och Decision tree studerades möjligheten att automatiskt klassificera refugerna. En refug bestod av en vektorpolygon vilket är en lista med koordinater. Polygonens hörn bestod av koordinatparen latitud och longitud. Norge-datasamlingen var inte i forväg kategoriserad till sina elva typer och kunde därfor inte anvandas. En datasamling med 2157 refuger med sju typer från Portland, USA tillämpades i stället. De spatiala vektorpolygonerna transformerades med Elliptical Fourier Descriptors (EFD). Maskinlärningsmodellerna tränades på att klassificera refugerna baserat på matematiska approximationer av dess konturer från EFD. Slutsatser kunde dras genom att refugtypernas konturer analyserades och prestationer observerades. Prestationer utvärderades utifrån traffsäkerhet med kompletterande mätvarden som precision och återkallelse på Portland-datasamlingen. Traffsäkerhet är andelen rätta klassificeringar av refugerna. KNN uppnådde 64 % och Decisiontree 69 % traffsäkerhet. Då båda datasamlingarna var verkliga exempel på refuger i vägnat kunde ett antagande göras att det inte skulle bli en mycket högre traffsäkerhet om studiens metod appliceras på Norge-datasamlingen. Modellernas prestationer bedömdes därmed inte vara tillrackligt bra for en rekommendation.

    Fulltekst (pdf)
    fulltext
  • 27.
    Andersson, Jesper
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Danielsson, Sebastian
    Högskolan Dalarna, Institutionen för information och teknik.
    Jämförande studie av AI-verktyg för systemutveckling och testning: Med fokus på säkerhet2024Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna studie undersöker användningen av kodassistenter som bygger på generativ AI (GAI) för systemutveckling och testning inom myndigheter och större företag, med fokus på säkerhetsrisker och funktionella krav. Detta görs genom en kartläggning där intervjuer och interna såväl som publika dokument används som datainsamlingsmetod.

    Med den snabba utvecklingen av stora språkmodeller (LLM:s) och deras tillämpningar inom systemutveckling är det viktigt för organisationer att göra val av AI-verktyg som uppfyller både säkerhets- och funktionskrav. Studien kartlägger och jämför olika verktyg baserat på dessa kriterier, med syfte att hjälpa organisationer att göra välavvägda val i ett ständigt växande utbud av GAIverktyg för programmering.

    Säkerhetsriskerna som identifierats inkluderar risken för informationsläckor och generering av osäker kod. Studien föreslår mitigerande åtgärder som användning av verktyg som inte sparar eller tränar på användardata för att minska dessa risker. Funktionella krav som identifierats inkluderar förmågan att generera och förklara kod, samt integration med utvecklingsmiljöer som Visual Studio och VisualStudio Code. Verktygen filtrerades därefter baserat på de identifierade mitigeringarna, vilket resulterade i en rekommendation av sex verktyg som uppfyller säkerhetskraven. Fyra av dessa sex verktyg uppfyller i sin tur de ställda kriterierna från samarbetspartnern (Trafikverket) gällande funktionskrav.

    Denna studie bidrar till den akademiska forskningen genom att erbjuda en ökad förståelse för säkerhets- och funktionsaspekterna av GAI-verktyg (ChatGPT, Claude, Codeium, Codiumate, Cody, GitHub Copilot, Gemini, Q, Tabnine) inom systemutveckling och testning. Detta genom en lista över potentiella säkerhetsrisker och en interaktiv jämförelsetabell där identifierade GAI-verktygkan filtreras efter olika krav.

    Fulltekst (pdf)
    fulltext
  • 28.
    Andersson, Julia
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Liedström, Matilda
    Högskolan Dalarna, Institutionen för information och teknik.
    Effekten av olika logistiklösningar: En studie kring fördelar och nackdelar med tredjepartslogistik och inbärning till ett projekt i Dalarna2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Inom byggbranschen har man börjat sett fördelar med att titta mer på logistiken iolika byggprojekt. Många olika studier har utförts kring vilka lösningar som finnsoch hur man kan använda dem.Denna studie utförs i samarbete med Skanska Sverige AB. Studien syftar till att påolika sätt undersöka vilka fördelar och nackdelar man kan se med att använda sigav logistiktjänsterna terminalisering och inbärning till ett byggprojekt i Dalarna.Byggprojektet som utgör det specifika fallet i studien är ett ombyggnadsprojekt aven grundskola. Elever vistas i detta skolområde samtidigt som ombyggnationenutförs etappvis inom det stängda arbetsområdet. Studien innefattar även tredje mandär trygghetsupplevelse kring arbetsplatsen undersöks. Inbärningens användbarhetdiskuteras därefter utifrån trygghetsupplevelsen kring och inom arbetsplatsen samtutifrån ekonomiskt och ekologiskt perspektiv.Metoder som används i studien är intervjuer med somliga från projektets ledning,en logistiker på Skanska, rektor för årskurs F-6, yrkesarbetare samt tredje man.Utöver dessa intervjuer utförs även en fältstudie som involverar observationer ochmätningar. Som avslut utförs överslagsberäkningar för att se om användning av ettexternt företag kan leda till ekonomisk lönsamhet.Studiens resultat visar hur man inom företaget ser på logistiklösningarnaterminalisering och inbärning idag. Här visas även vilka fördelar och nackdelarolika parter ser med tjänsterna. Fältstudiens mätningar visar hur många av tredjeman som rör sig kring arbetsområdet i anslutning till att skoldagen börjar.Överslagsberäkningar visar på att man kan se en besparing ifall man använder sigav ett inbärningsföretag som arbetar under kvällstid och detta sker i samband medatt man använder sig av terminalisering.Studiens slutsatser är att det inte finns en allmän lösning till hur logistikfrågan skalösas på olika projekt. Om det finns möjlighet för terminalisering i området ärdetta samt inbärning ett alternativ för projektet.

    Fulltekst (pdf)
    fulltext
  • 29.
    Andersson, Mattias
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Marshall Olsson, Tom
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    ChatGPT as a Supporting Tool for System Developers: Understanding User Adoption2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Bakgrund: AI, specifikt konversations-AI som OpenAI:s ChatGPT, växer snabbt i både privata och professionella sammanhang, vilket erbjuder möjligheter till kostnadsbesparingar och modernisering för företag. ChatGPT kan simulera mänskliga konversationer, vilket kan ge fördelar i flera olika industrier och kan genom samarbete mellan människa och AI potentiellt förbättra anställdas produktivitet. Det huvudsakliga forskningsproblemet är att identifiera faktorer som påverkar systemutvecklarens användning av ChatGPT och beakta dess design och implementation för att minska potentiella negativa effekter. Syfte:  Denna studie syftar till att undersöka de faktorer som påverkar användares adoption ChatGPT som ett verktyg för att stödja systemutvecklare. Dessutom syftar studien till att identifiera hur ChatGPT kan hjälpa systemutvecklare i deras dagliga arbete och vilka hinder som finns för att inkorporera ChatGPT i denna kontext. Metod: Genom en fallstudieansats med kvalitativa och kvantitativa datainsamlingsmetoder, använder studien positivistiska och interpretivistiska paradigm. Resultat: Resultatet visar att den uppfattade förmågan hos ChatGPT att förbättra effektiviteten och generera korrekta svar påverkar avsikten att använda tekniken. Faktorer som tidsbesparing, produktivitetsförbättring och användarvänlighet gav dock inte statistiskt signifikanta resultat. Utvecklare finner ChatGPT användbart för att förenkla uppgifter och hjälpa juniora utvecklare, men det finns oro för att hantera komplexa uppgifter och säkerhetsfrågor. Slutsatser: Användarnas acceptans av ChatGPT drivs främst av den uppfattade precisionen och effektiviteten. ChatGPT kan hjälpa till med uppgifter som felsökning, kodgenerering, kodrefaktorering, kodoptimering och teknisk dokumentation, men med vissa potentiella begränsningar när det gäller hantering av alltför komplex kod. Trots detta så finns hinder för införandet i form av oro för integritet, säkerhet och brist på medvetenhet samt funktionella begränsningar. Följder: De insikter som vunnits kan indirekt gynna företag, inklusive vår affärspartner CGI, genom att bidra till beslutsfattandeprocesser relaterade till adoption och användning av ChatGPT.

    Fulltekst (pdf)
    fulltext
  • 30.
    Andersson, Michael
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Hysing Berg, Robert
    Högskolan Dalarna, Institutionen för information och teknik.
    Docker Container Images: Concerns about available container image scanning tools and image security2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    With the growing use of cloud computing and need for resource effectiveness, the use of container technology has increased compared to virtual machines. This is since containers require fewer resources and are significantly faster to start up. A popular containerplatform is Docker which lets users manage and run containers. The containers are run from images that can be downloaded from different sources, Docker Hub being a popular choice. Because of container technology sharing the OS-kernel with the host, there is a great need to increase and monitor the security of containers and the images they are run from. To find vulnerabilities in images, there are image scanning tools available. In this dissertation, we study 5 different image scanning tools and their performance. Twentyfive random images were selected from popular images on Docker Hub and were then scanned for vulnerabilities with the tools in the study. We aimed to answer the following questions: (1) Are there any clear differences between the number of vulnerabilities found by different image vulnerability scanning tools? (2) Are there any differences between the types of vulnerabilities found by different image vulnerability scanning tools? (3) What is the relative effectiveness of different image vulnerability scanning tools? The results show that there are considerable differences between different container image scanning tools regarding the number of found vulnerabilities. We also found that there were differences regarding the severity-grading of found vulnerabilities between the tested tools. When using our proposed metric for calculation of relative effectiveness, we discovered that the tool with the highest relative effectiveness could still miss approximately 39 percent of the vulnerabilities in images. The tool with the lowest relative effectiveness could miss approximately 77 percent of the vulnerabilities in images. 

    Fulltekst (pdf)
    fulltext
  • 31.
    Andersson, Mikael
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Byggteknik.
    Barrioz, Gabriel
    Borlänge kommun.
    Nordström, Louise
    Borlänge kommun.
    Ranhagen, Ulf
    Högskolan Dalarna, Institutionen för information och teknik, Byggteknik.
    Svensson, Tony
    Högskolan Dalarna, Institutionen för information och teknik, Byggteknik.
    Rönnelid, Mats
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik.
    Energiinnovation Jakobsdalen: Workshopserie hösten 20212022Rapport (Annet vitenskapelig)
    Fulltekst (pdf)
    fulltext
  • 32.
    Andersson, Moa
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Enqvist, Tom
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Bridging the Skills Gap: Applying an LLM and RAG Architecture for Recommending Competence Development in the IT JobMarket2024Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Job Recommendation Systems have traditionally been using machine learning and information retrieval techniques such as Word2Vec, Term Frequency – Inverse Term Frequency and Support Vector Machines. The rise of Large Language Models (LLM) could potentially bridge the shortcomings of the traditional techniques. LLMs have other shortcomings which could be mitigated using the Retrieval Augmented Generation (RAG) architecture, which grounds output of an LLM to a dataset. This thesis explores the use of LLMs and RAG in job recommendation systems. Addressing gaps in existing methods that overlook user’s skills, geographic preferences, and multilingual datasets. LLMs and RAG enhance recommendation systems by processing unstructured data and providing grounded, personalized suggestions. This thesis aims to evaluate the trustworthiness and utility of an LLM in recruitment and competence development. It examines how an LLM can enhance traditional recruitment processes and support job seekers by recommending skills needed for specific job roles and regions, based on a user’s existing skills – resulting in a curated list of skills that could be improved upon. The methodology involves using Swedish IT job market data to provide personalized skill recommendations for job seekers based on their existing skills and desired job titles for specific regions. Data is collected, cleaned, and formatted to meet system requirements, and the models’ usefulness is evaluated through questionnaires, experiments and interviews with IT-students and recruitment professionals and analyzed using thematic and quantitative analysis. The inclusion of LLMs in recruitment and competence development shows promising potential. Findings suggest LLMs can refine the recruitment process, identify skill gaps, and offer insights for both job seekers and recruiters. Both IT-students and professionals in recruitment express optimism about LLMs ability to enhance traditional methods. Respondents given examples of the model’s output showed positive reactions and valuable insights in potential.

    Fulltekst (pdf)
    fulltext
  • 33.
    Andrén, Axel
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Kashlan, Ghaith
    Högskolan Dalarna, Institutionen för information och teknik.
    Nantarat, Atichoke
    Högskolan Dalarna, Institutionen för information och teknik.
    Improving Email Security in Organizations: Solutions and Guidelines2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Data breaches from email attacks have been an issue since email was first implemented. Common attack methods like phishing are still a threat to organizations to this very day. That is because it never seems to stop evolving and keeps becoming more and more convincing. Email compromises have caused billions of dollars in damage worldwide, and it shows no sign of stopping. The purpose and research questions of this thesis are formulated to find guidelines or solutions that organizations can follow to improve their overall email security and awareness. In this thesis, both a systematic literature review and interviews are methods used to conduct the research. That way, both the technical portion of the subject, as well as the human perspective are covered. We found that the most common and significant email threats to organizations are phishing, BEC, and APT attacks. This thesis provides methods to mitigate these threats. What has also become clear is that human mistakes are a large portion of the problem concerning email attacks.

    Fulltekst (pdf)
    fulltext
  • 34. Anglart, D
    et al.
    Emanuelson, U
    Rönnegård, Lars
    Högskolan Dalarna, Institutionen för information och teknik, Statistik.
    Sandgren, C Hallén
    Detecting and predicting changes in milk homogeneity using data from automatic milking systems.2021Inngår i: Journal of Dairy Science, ISSN 0022-0302, E-ISSN 1525-3198, Vol. 104, nr 10, s. 11009-11017Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To ensure milk quality and detect cows with signs of mastitis, visual inspection of milk by prestripping quarters before milking is recommended in many countries. An objective method to find milk changed in homogeneity (i.e., with clots) is to use commercially available inline filters to inspect the milk. Due to the required manual labor, this method is not applicable in automatic milking systems (AMS). We investigated the possibility of detecting and predicting changes in milk homogeneity using data generated by AMS. In total, 21,335 quarter-level milk inspections were performed on 5,424 milkings of 624 unique cows on 4 farms by applying visual inspection of inline filters that assembled clots from the separate quarters during milking. Images of the filters with clots were scored for density, resulting in 892 observations with signs of clots for analysis (77% traces or mild cases, 15% moderate cases, and 8% heavy cases). The quarter density scores were combined into 1 score indicating the presence of clots during a single cow milking and into 2 scores summarizing the density scores in cow milkings during a 30-h sampling period. Data generated from the AMS, such as milk yield, milk flow, conductivity, and online somatic cell counts, were used as input to 4 multilayer perceptron models to detect or predict single milkings with clots and to detect milking periods with clots. All models resulted in high specificity (98-100%), showing that the models correctly classified cow milkings or cow milking periods with no clots observed. The ability to successfully classify cow milkings or cow periods with observed clots had a low sensitivity. The highest sensitivity (26%) was obtained by the model that detected clots in a single milking. The prevalence of clots in the data was low (2.4%), which was reflected in the results. The positive predictive value depends on the prevalence and was relatively high, with the highest positive predictive value (72%) reached in the model that detected clots during the 30-h sampling periods. The misclassification rate for cow milkings that included higher-density scores was lower, indicating that the models that detected or predicted clots in a single milking could better distinguish the heavier cases of clots. Using data from AMS to detect and predict changes in milk homogeneity seems to be possible, although the prediction performance for the definitions of clots used in this study was poor.

    Fulltekst (pdf)
    fulltext
  • 35.
    Apelman, Jonas
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Johnson, Konrad
    Högskolan Dalarna, Institutionen för information och teknik.
    Informationsdesign i kristid: Regioner och effektiv kommunikation genom Instagram2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Bakgrund I slutet av 2019 började spridningen av SARS-CoV-2 i Kina. För a; förhindrasmi;spridning har myndigheterna i Sverige stå; inför en utmaning a; förmedlakrisinforma<on på e; effek<vt sä;. E; sä; de når många är genomsociala medier där bild och text oTa kombineras för a; förmedla e; budskap.Syfte SyTet är a; analysera hur tre regioner använt Instagram för a; förmedlainforma<on om pandemin <ll sina medborgare, samt vilken strategi somfungerat bäst.Metod Undersökningen använde intervjuer för a; se hur regionerna såg på si; arbeteoch mål med Instagram. DäreTer en enkätundersökning för a; kollamålgruppens aVtyd <ll regionernas inlägg. Inläggen jämfördes även mot enmul$modal analys för a; kunna klassificera och analysera dem.Resultat Undersökningen visade a; regionerna hade olika målgrupper och syTenmed Instagram, och a; de;a speglades i inläggen. Undersökningen visadea; vissa mul<modala u;ryck som kulturella symboler, analy$ska processeroch textuella metafunk$oner kan ha posi<v inverkan på medborgarnas upplevelseav Instagraminläggens informa<onsförmedling. Undersökningen visadeäven a; det är en utmaning för regionerna a; få medborgarna a; viljaläsa hela inläggen. I synnerhet om kulturella symbolerna används på e; felak<gt sä; eller om bildens budskap uppfa;as vara irrelevant. Undersökningenvisade a; regionerna ämnar följa myndigheternas skrivregler mena; det i prak<ken inte all<d uXörs.Slutsatser Undersökningen visade a; vissa mul<modala val kan leda <ll både posi<vaoch nega<va effekter på medborgarnas aVtyder <ll informa<onen som förmedlas.Regionerna behöver vara medvetna om a; inläggens budskap ochhur användandet av kulturella symboler kan ha en nega<v påverkan påmedborgarnas vilja a; ta <ll sig e; inläggs informa<on.

    Fulltekst (pdf)
    fulltext
  • 36.
    Aras, Diyar
    Högskolan Dalarna, Institutionen för information och teknik.
    Byggfel i produktion: Vanligaste uppkommande byggfelen i byggprocessen2023Independent thesis Basic level (university diploma), 5 poäng / 7,5 hpOppgave
    Abstract [sv]

    Byggfel vid upprättande av byggnationer genomsyrar byggbranschen och står för onödigt höga kostnader av den totala byggkostnaden. Denna problematik har under de senaste åren uppmärksammats markant av både aktörer inom byggbranschen, samt av samhället. Enligt en rapport upprättad av Boverket (2022) uppnår dessa kostnader närmare 100 miljarder kronor och därmed sänker värdigheten i de investerade pengarna. Syftet med denna rapport är att upplysa problemområdet, och utifrån samverkan med aktörer som är delaktiga i byggprocessens olika skeden, försöka undersöka vilka byggfel som är vanligast och vart dess brister uppkommer. Utifrån det som påvisas så ska konkreta åtgärder och förbättringstips lyftas fram. Syftet och frågeställningarna i rapporten förväntas besvaras och uppnås via kvalitativa studier. Dessa studier kommer att upprättas i from av intervju och litteraturstudie. Intervjuerna kommer att hållas med aktörer inom byggbranschen som medverkar i byggprocessens olika skeden, detta urval ska ge möjligheten att få tankar och idéer utifrån olika synvinklar. Byggfelen som anses vara vanligast förekommande är fukt och vattenrelaterade skador, samt montering och infästning. Denna typen av skador uppkommer på olika platser i byggnationer, men främst i badrum och våtrum, takfönstermontering, fönsterdörrar och tyngre dörrar. De bakomliggande orsakerna till uppkomsten av dessa skador är bristande i kunskap, erfarenhet och tidspress. Bristande kunskapen och erfarenheten anses vara en central faktor i både projekteringen och produktionen, medan tidspressen framhävs tydligast i produktionsfasen. För att få bukt med byggfel-problematiken krävs det specifika enskilda åtgärder för de olika problemområdena genomförs. Ansvarstagandet hos de olika aktörerna i byggbranschen behöver öka, både i planering, utförande och kravsättning.

  • 37. Ardestani, Seyed Faraz Mahdavi
    et al.
    Adibi, Sasan
    Golshan, Arman
    Högskolan Dalarna.
    Sadeghian, Paria
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Factors Influencing the Effectiveness of E-Learning in Healthcare: A Fuzzy ANP Study2023Inngår i: Healthcare, E-ISSN 2227-9032, Vol. 11, nr 14, artikkel-id 2035Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    E-learning has transformed the healthcare education system by providing healthcare professionals with training and development opportunities, regardless of their location. However, healthcare professionals in remote or rural areas face challenges such as limited access to educational resources, lack of reliable internet connectivity, geographical isolation, and limited availability of specialized training programs and instructors. These challenges hinder their access to e-learning opportunities and impede their professional development. To address this issue, a study was conducted to identify the factors that influence the effectiveness of e-learning in healthcare. A literature review was conducted, and two questionnaires were distributed to e-learning experts to assess primary variables and identify the most significant factor. The Fuzzy Analytic Network Process (Fuzzy ANP) was used to identify the importance of selected factors. The study found that success, satisfaction, availability, effectiveness, readability, and engagement are the main components ranked in order of importance. Success was identified as the most significant factor. The study results highlight the benefits of e-learning in healthcare, including increased accessibility, interactivity, flexibility, knowledge management, and cost efficiency. E-learning offers a solution to the challenges of professional development faced by healthcare professionals in remote or rural areas. The study provides insights into the factors that influence the effectiveness of e-learning in healthcare and can guide the development of future e-learning programs.

    Fulltekst (pdf)
    fulltext
  • 38.
    Arumugam, Vijay
    Högskolan Dalarna, Institutionen för information och teknik.
    Techno-economic study of second-life EV batteries as alternative energy storage and comparison with lead-acid and new Li-ion batteries in off-grid PV systems2022Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The global EV stock is expected to increase from 7.2 million in 2019 to nearly 140 million vehicles by 2030. So, the demand for the battery also increases due to the increase in the number of EVs. In any EV, battery degradation is an unavoidable phenomenon and EV batteries are assumed to arrive at their end-of-life in EV application when the state of health reaches 80 %, repurposing the eligible EV batteries after end of first life is expected to extend their lifetime by another 5-15 years in the second life applications. 

    This thesis aims to conduct a techno-economic study on the usage of second life EV batteries as an alternative storage option in off-grid PV systems compared to lead-acid batteries and new Li-ion batteries. A single-family house with an annual demand of 2245 kWh/year located in Athens was chosen as the primary location, the off-grid PV system is pre-sized for Athens and based on the pre-sizing results and what is state of art in the market. The system components were chosen for system design (4 kW bi-directional inverter, 2.9 kW PV array, 7.2 kW genset and three battery bank options i.e., 16.5 kWh of lead-acid, 8 kWh new Li-ion and 12.6 kWh of second life EV battery). PV off-grid system with different storage options is simulated using HOMER for both locations and the results are compared. 

     The simulation results show that the designed off-grid PV system can reach a solar fraction of 90 % in Athens and 73 % in Gotland when 16.5 kWh of lead-acid batteries are used with an allowed depth of discharge of 50 %. When a new Li-ion battery of 8 kWh with an allowed depth of discharge of 80 % is used then the achievable solar fraction is 84 % in Athens and 71 % in Gotland, When the second life EV battery of 12.6 kWh with an allowed depth of discharge of 60 % is used then the achievable solar fraction is 90 % in Athens and 74 % in Gotland. Sensitivity analysis is performed on the depth of discharge and results showed that the solar fraction can be increased by allowing the battery to discharge more, but it also decreases the battery lifetime. 

     The simulation results also show that the net present cost was lower in Athens for all the reference cases compared to Gotland. Net present cost and levelized cost of electricity for the off-grid system are 25.3 k€, 0.9 €/kWh in Athens and 29.2 k€, 1.0 €/kWh in Gotland when a lead-acid battery is used. When a new Li-ion battery is used then 26.2 k€, 0.9 €/kWh in Athens and 29.3 k€, 1.0 €/kWh in Gotland, when the second life EV battery is used then 26.7 k€, 0.9 €/kWh in Athens and 30.7 k€, 1.1 €/kWh in Gotland. 

     Overall, the net present cost and levelized cost of electricity are lower in Athens in all cases compared to Gotland. For the reference house in Athens, lead acid battery system has shown slightly lower net present cost than new Li-ion battery and second life EV battery. For the reference house in Gotland, both lead acid battery and new Li-ion battery system have shown similar net present cost and they are slightly lower than second life EV battery.  

    Also, the second life EV battery levelized cost of electricity is fairly comparable to the new Li-ion and lead acid battery system. In future, the massive inflow of used batteries from EV are expected to be available on the market for the second life application at a lower price than today. Thus, in future, second life EV batteries can become economically viable.

    Fulltekst (pdf)
    fulltext
  • 39. Arya, N.
    et al.
    Chandran, Y.
    Luhar, B.
    Kajal, P.
    Powar, Satvasheel
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik. Indian Institute of Technology, Mandi, Himachal Pradesh, India.
    Balakrishnan, V.
    Porosity-Engineered CNT-MoS2 Hybrid Nanostructures for Bipolar Supercapacitor Applications2023Inngår i: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 15, nr 29, s. 34818-34828Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Bipolar supercapacitors that can store many fold higher capacitance in negative voltage compared to positive voltage are of great importance if they can be engineered for practical applications. The electrode material encompassing high surface area, better electrochemical stability, high conductivity, moderate distribution of pore size, and their interaction with suitable electrolytes is imperative to enable bipolar supercapacitor performance. Apropos of the aforementioned aspects, the intent of this work is to ascertain the effect of ionic properties of different electrolytes on the electrochemical properties and performance of a porous CNT-MoS2 hybrid microstructure toward bipolar supercapacitor applications. The electrochemical assessment reveals that the CNT-MoS2 hybrid electrode exhibited a two- to threefold higher areal capacitance value of 122.3 mF cm-2 at 100 μA cm-2 in 1 M aqueous Na2SO4 and 42.13 mF cm-2 at 0.30 mA cm-2 in PVA-Na2SO4 gel electrolyte in the negative potential window in comparison to the positive potential window. The CNT-MoS2 hybrid demonstrates a splendid Coulombic efficiency of ∼102.5% and outstanding stability with capacitance retention showing a change from 100% to ∼180% over 7000 repeated charging-discharging cycles. © 2023 American Chemical Society.

  • 40. Arzpeyma, N.
    et al.
    Alam, Moudud
    Högskolan Dalarna, Institutionen för information och teknik, Statistik.
    Gyllenram, R.
    Jönsson, P. G.
    Model development to study uncertainties in electric arc furnace plants to improve their economic and environmental performance2021Inngår i: Metals, ISSN 2075-4701, Vol. 11, nr 6, artikkel-id 892Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A statistical model is developed in order to simulate the melt composition in electric arc furnaces (EAFs) with respect to uncertainties in 1) scrap composition, 2) scrap weighing and 3) element distribution factors. The tramp element Cu and alloying element Cr are taken into account. The model enables simulations of a charge program as well as backwards estimations of the element concentrations and their variance in scrap. In the backwards calculation, the maximum likelihood method is solved by considering three cases corresponding to the involved uncertainties. It is shown that the model can estimate standard deviations for elements so that the real values lie within the estimated 95% confidence interval. Moreover, the results of the model application in each target product show that the estimated scrap composition results in a melt composition, which is in good agreement with the measured one. The model can be applied to increase our understanding of scrap chemical composition and lower the charged material cost and carbon footprint of the products. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

    Fulltekst (pdf)
    fulltext
  • 41. Attri, Shubham Dutt
    et al.
    Singh, Shweta
    Dhar, Atul
    Powar, Satvasheel
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik. Indian Institute of Technology Mandi, Himachal Pradesh, India.
    Multi-attribute sustainability assessment of wastewater treatment technologies using combined fuzzy multi-criteria decision-making techniques2022Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 357, artikkel-id 131849Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Water, which is predicted to be one of the most critical resources for the near future, also plays a vital role in society's sustainable development. Wastewater treatment is a critical part of the circular water management system and offers various technological alternatives. Taking appropriate decision for the technology selection is, therefore, essential for a long-term perspective. A complex yet imperative process is the sustainable selection of the wastewater treatment process. This paper presents the use of multi-criteria decision-making (MCDM) in the sustainability assessment of wastewater treatment technologies that may be very relevant to the growing sector with many emerging options. A comparison of six wastewater treatment technologies based on four sustainability parameters using three MCDM techniques, namely FSWARA, FMOORA and FTOPSIS is presented in detail. FSWARA is used for weighting criteria and the other two for technology ranking. The detailed step-by-step comparison study is presented and the results were somewhat predictable for the study, and this confirms the reliability of the methodology. This paper's primary objective is to propose a well-defined increscent practice for making sustainable wastewater treatment decisions among state-of-the-art technologies.

    Fulltekst (pdf)
    fulltext
  • 42.
    Ayubu, Victoria Said
    et al.
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Khan, Mohammed Shahid
    Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    Exploring Swedish Attitudes and Needs Regarding Sustainable Food through Sentiment Analysis in Social Media2024Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Social media has recently become an essential component of our daily modern life, with platforms like Facebook, YouTube, and Twitter serving as popular venues for people to share their opinions on various topics, including sustainable food. The interest in consumer sentiments towards sustainable practices has increased particularly after Covid-2019. This study investigates the attitudes and needs of Swedish consumers regarding sustainable food consumption as reflected in their social media interactions using 4588 comments from Facebook and YouTube. The methodology used are sentiment analysis and topic modelling with VADER and Latent Dirichlet Allocation (LDA) respectively. The results reveal a generally strong positive attitude toward sustainable food. However, the study observes further a decline in positive sentiments over time, indicating changing consumer opinions. The primary topic identified is market challenges, such as high pricing. Furthermore, health concerns and environmental considerations are identified both as important factors influencing the choice of sustainable food. The findings highlight the necessity for policy interventions to enhance the affordability and accessibility of sustainable food, as well as the effective use of social media for raising consumer awareness.

    Fulltekst (pdf)
    fulltext
  • 43.
    Backer-Meurke, Henrik
    et al.
    Högskolan Dalarna, Institutionen för information och teknik.
    Polland, Marcus
    Högskolan Dalarna, Institutionen för information och teknik.
    Predicting Road Rut with a Multi-time-series LSTM Model2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Road ruts are depressions or grooves worn into a road. Increases in rut depth are highly undesirable due to the heightened risk of hydroplaning. Accurately predicting increases in road rut depth is important for maintenance planning within the Swedish Transport Administration. At the time of writing this paper, the agency utilizes a linear regression model and is developing a feed-forward neural network for road rut predictions. The aim of the study was to evaluate the possibility of using a Recurrent Neural Network to predict road rut. Through design science research, an artefact in the form of a LSTM model was designed, developed, and evaluated.The dataset consisted of multiple-multivariate short time series where research was limited. Case studies were conducted which inspired the conceptual design of the model. The baseline LSTM model proposed in this paper utilizes the full dataset in combination with time-series individualization through an added index feature. Additional features thought to correlate with rut depth was also studied through multiple training set variations.

    The model was evaluated by calculating the Root Mean Squared Error (RMSE) and the Mean Absolute Error (MAE) for each training set variation. The baseline model predicted rut depth with a MAE of 0.8110 (mm) and a RMSE of 1.124 (mm) outperforming a control set without the added index. The feature with the highest correlation to rut depth was curvature with a MAEof 0.8031 and a RMSE of 1.1093. Initial finding shows that there is a possibility of utilizing an LSTM model trained on multiple-multivariate time series to predict rut depth. Time series individualization through an added index feature yielded better results than control, indicating that it had the desired effect on model performance.

    Fulltekst (pdf)
    fulltext
  • 44. Bai, W.
    et al.
    Johanson, Martin
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Uppsala University.
    Oliveira, Luis
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys. Center for International Business Studies, Fundação Getúlio Vargas, Brazil.
    Ratajczak-Mrozek, M.
    Francioni, B.
    Where business networks and institutions meet: Internationalization decision-making under uncertainty2022Inngår i: Journal of International Management, ISSN 1075-4253, E-ISSN 1873-0620, Vol. 28, nr 1, artikkel-id 100904Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Both business networks and institutional forces are relevant to firm internationalization but they have seldom been studied together. We investigate under what circumstances firms are more likely to adopt non-predictive strategy in light of the influence of the business networks, the institutional forces, and the home market background affecting their internationalization. Based on survey data from 758 small and medium-sized enterprises (SMEs) from Brazil, China, Poland, Italy, and Sweden, our results support the effects of formal institutional distance and cultural differences on the use of non-predictive strategies by SMEs in internationalization decisions, as well as the contingency effects of business network stability and of having an emerging market background. We integrate research on the liability of foreignness and the liability of outsidership and find that business network stability is critical. It does not moderate the relation between cultural difference and NPS adoption but attenuates the negative relation between institutional distance and NPS adoption, indicating that the liabilities of foreignness and outsidership play different roles in internationalization. © 2021 The Author(s)

    Fulltekst (pdf)
    fulltext
  • 45.
    Bai, Wensong
    et al.
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Zhejiang University of Technology, Hangzhou, China; Uppsala University.
    Hilmersson, M.
    Johanson, Martin
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Uppsala University.
    Oliveira, Luis
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys.
    SMEs' regional diversification: dynamic patterns and home market institutional determinants2023Inngår i: International Marketing Review, ISSN 0265-1335, E-ISSN 1758-6763Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose: The authors seek to advance the understanding of small- and medium-sized enterprise (SME) internationalization at the regional level and examine the role of home market institutions in this process. Design/methodology/approach: The authors analyze hypotheses with data from SMEs in five country markets and from the Global Entrepreneurship Monitor. A cluster analysis establishes the regional diversification patterns (based on regional diversification scope, speed and rhythm) and a multinomial regression tests the effect of home market institutions on their adoption. Findings: The results offer a refined picture of SME regional diversification by revealing three patterns: intra-regionally focused firms, late inter-region diversifiers and early inter-region diversifiers. They also suggest that the adoption of these patterns is determined by SMEs' home market institutions. Originality/value: The authors develop a nuanced understanding of SME internationalization by building upon and expanding the regionalization rationale in the internationalization patterns literature. Additionally, the authors address the acknowledged, yet rarely investigated, country-level determinants of internationalization patterns. © 2023, Emerald Publishing Limited.

  • 46.
    Bai, Wensong
    et al.
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Zhejiang University of Technology, China; Uppsala University.
    Johanson, Martin
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Uppsala University; University of Huddersfield, UK.
    Oliveira, Luis
    Högskolan Dalarna, Institutionen för kultur och samhälle, Företagsekonomi. Högskolan Dalarna, Institutionen för information och teknik, Mikrodataanalys. Center for International Business Studies, Fundação Getúlio Vargas, Brazil.
    Ratajczak-Mrozek, Milena
    Poznan University.
    The Role of Business and Social Networks in the Effectual Internationalization: Insights from Emerging Market SMEs2021Inngår i: Journal of Business Research, ISSN 0148-2963, E-ISSN 1873-7978, Vol. 129, s. 96-109Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study investigates the performance implications of the distinct mechanisms represented by business and social networks in the effectual internationalization. Our hypotheses consider the influence of both network types on firms’ decision-making during internationalization, including the use of effectuation’s overarching principle of non-predictive strategy and the analysis of affordable losses as preferred criterion for selecting between action paths. We test our structural model on a sample of 469 SMEs from Brazil, China, and Poland. The analysis demonstrates that the knowledge circulating in the firms’ business networks negatively moderates the relationship between non-predictive strategy and affordable losses, while social networking mediates the relationships between both non-predictive strategy and affordable losses, on the one hand, and international performance, on the other.

  • 47.
    Barraza, Diego
    Högskolan Dalarna, Institutionen för information och teknik, Informatik.
    Behov av systemintegration i energibranschen: En fallstudie om hur ett behov uppstår.2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Fallstudien har undersökt hur ett behov uppstår av att integrera informationssystem med varandra, vad det innebär för företag som inte väljer att integrera informationssystem och vilka för- och nackdelar det finns det med systemintegration. Fallföretaget som i denna studie kallas för ”Energiföretaget AB” och innehar flera ansvarsområden som anses vara samhällsviktiga tjänster för infrastrukturen. Företaget förser lokalbefolkning med energi, dricksvatten, sophantering och värme. Utifrån verksamhetens sju olika ansvarsområden tvingas fallföretaget använda sig av flera informationssystem som förser affärssystemet med all nödvändiga data för att personalen ska kunna skapa en slutfaktura till kunderna. Datainsamlingen har genomförts via semistrukturerade intervjuer och tre olika personer har intervjuats från fallföretaget. Urvalet av respondenter grundar sig på olika kriterier som ansågs vara nödvändiga för studien. Analysen har att kunnat spegla studiens teorier som presenterar fyra olika typer informationssystem som verksamheter kan använda sig av och sju olika motiv till systemintegrationer. Resultatet från studien är att behovet av systemintegration kan bestå av omvärldens krav på verksamheten där även politiska beslut påverkar ifall informationssystemen måste förändras och integreras med andra informationssystem. Fallföretagets senaste utökning av ansvarsområde påverkar även informationssystem i verksamheten för att kunna bemöta arbetsprocesserna behov. Det leder till att det sker förändringar och befintliga informationssystemen måste integreras. Det besvarar första forskningsfrågan i denna studie. Andra forskningsfrågan som är vad det innebär för företag som inte väljer att integrera informationssystem har inte kunnat besvarats på grund av de otillräckliga insamlade data och kan inte generaliseras. Tredje forskningsfrågan som är vilka för- och nackdelar det finns med systemintegrationer har kunnat besvarats och summerats i en tabell. Utifrån analysen har respondenterna svar summerats i tabellen och redovisar flera punkter i både för- och nackdelar. En återkommande punkt som respondenterna benämnde var att manuella arbeten försvinner och minimerar fel i informationssystemen.

    Fulltekst (pdf)
    fulltext
  • 48. Barthwal, M.
    et al.
    Dhar, A.
    Powar, Satvasheel
    Högskolan Dalarna, Institutionen för information och teknik, Energiteknik. School of Engineering, Indian Institute of Technology, India.
    Effect of Nanomaterial Inclusion in Phase Change Materials for Improving the Thermal Performance of Heat Storage: A Review2021Inngår i: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 4, nr 8, s. 7462-7480Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Dispersion of nanoparticles is one of the potential solutions to improve the thermophysical properties of phase change (or transition) materials (PCMs) and enhance the performance of latent thermal energy storage (LTES) systems. The PCM ought to have a high latent heat of fusion, and zero or negligible coefficient of thermal expansion. A good PCM should have melting and solidification compatibility with negligible or zero subcooling, and it should not react with the common chemical reagents. The present known PCMs possess low thermal conductivity that results into a longer solidification and melting time of PCMs. In the past two decades, researchers have reported improved thermal conductivity and heat-storing capacity of PCMs employing graphite nanoparticles/fibers, carbon nanotubes/fibers, metal, and metal oxide nanoparticles. This work reviews the reported experimental and numerical studies describing the consequences of nanoparticle inclusions of various shapes and sizes on the thermal properties of the PCMs. This review attempts to make a consolidated database of the studies related to nanoadditive inclusion into PCMs for various applications. Graphene dispersed into PCM has resulted into 14 times thermal conductivity enhancement. As far as metal oxide nanoparticles are concerned, TiO2 and Al2O3 nanoparticles outperformed others. The compatibility between the nanoadditive and PCM is necessary to tailor favorable thermal properties. This work reviews numerous studies of different nanoparticle-PCM duos. © 2021 American Chemical Society.

  • 49. Bejjani, Roland
    et al.
    Salame, Charlie
    Olsson, Mikael
    Högskolan Dalarna, Institutionen för information och teknik, Materialteknik.
    An Experimental and Finite Element Approach for a Better Understanding of Ti-6Al-4V Behavior When Machining under Cryogenic Environment2021Inngår i: Materials, E-ISSN 1996-1944, Vol. 14, nr 11, artikkel-id 2796Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Due to increasing demand in manufacturing industries, process optimization has become a major area of focus for researchers. This research optimizes the cryogenic machining of aerospace titanium alloy Ti-6Al-4V for industrial applications by studying the effect of varying the nozzle position using two parameters: the nozzle's separation distance from the tool-chip interface and its inclination angle with respect to the tool rake face. A finite element model (FEM) and computational fluid dynamics (CFD) model are used to simulate the cryogenic impingement of cryogenic carbon dioxide on the tool-workpiece geometry. Experiments are conducted to evaluate cutting forces, tool wear, and surface roughness of the workpiece, and the results are related to the CFD and FEM analyses. The nozzle location is shown to have a significant impact on the cutting temperatures and forces, reducing them by up to 45% and 46%, respectively, while the dominant parameter affecting the results is shown to be the separation distance. Cryogenic machining is shown to decrease adhesion-diffusion wear as well as macroscopic brittle chipping of the cutting insert compared to dry turning, while the workpiece surface roughness is found to decrease by 44% in the case of cryogenic machining.

    Fulltekst (pdf)
    fulltext
  • 50.
    Belash, Daniel
    Högskolan Dalarna, Institutionen för information och teknik.
    Hållbar förflyttning: Omvandling av en bilanpassad stad till en gång- och cykelvänlig stad2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Vår framtid står inför stora utmaningar som behöver lösas för att vår vidare existens ska kunna fortsätta. Mänsklig påverkning på jorden har uppnått globala mått på grund av vårt sätt att leva och utnyttja naturresurser utan större konsekvenstänkande. Människans strävan efter att leva alltmer bekvämt och rikt har lett till urbanisering och teknisk progress som har skapat resursslukande hjälpmedel som transport. Stadsplaneringen har under den senaste delen av modern historia tagit en ny vändning och städerna har blivit alltmer anpassade efter våra fordon, vilket påverkar den sociala, ekonomiska och ekologiska hållbarheten negativt.

    Detta examensarbete syftar till att med hjälp av tidigare forskning hitta lösningar som skulle kunna omvandla bilanpassade städer till mer promenad- och cykelvänliga städer. Arbetet tillämpas i staden Borlänge som ligger i Dalarna och har präglats starkt av bilismens utveckling. Det viktiga med arbetet är att lyfta fram lösningar som kan användas även i andra städer oavsett geografisk placering eller storlek.

    Den granskade litteraturen har skapat ett detaljerat och övergripande underlag för att kunna möjliggöra vidare arbete med framtagning av åtgärder som kan lösa studiens syfte. Litteraturen har valts ut efter relevans för ämnet samhällsplanering för att kunna redovisa liknande inriktning på kunskaper vilket har gjort texten mer sammanhängande. Den största delen av litteraturen är vetenskapliga artiklar och böcker.

    Arbetet har utfört med hjälp av platsinventering som hjälpte till att upptäcka olika egenskaper i den befintliga miljön och val av två gång- och cykelstråk för framtagning av gestaltningsförslag. Tidigare forskning har skapat grund för de åtgärder som har presenterats i form av gestaltningsförslag. 

    Fulltekst (pdf)
    fulltext
1234567 1 - 50 of 653
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf