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  • 501.
    Vinka, Ida
    Dalarna University, School of Humanities and Media Studies, Moving Image Production.
    Tillbakablickar på två män som heter Ove: Flashbacks påverkan på Ove i berättelsen En man som heter Ove2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna vetenskapliga uppsats kommer boken En man som heter Ove och filmen En man

    som heter Ove jämföras med varandra, med fokus på Oves tillbakablickar. Detta görs genom

    att analysera bokens och filmens tillbakablickar som förklarar Oves förflutna. Filmens

    tillbakablickar visas via flashbacks. Syftet med denna uppsats är att se hur stor påverkan

    skillnaden mellan bokens tillbakablickar och filmens användande av flashbacks har på

    karaktären Ove. Oves resa placeras i Craig Battys modell av protagonistens resa, både i bok

    och film. De båda resorna jämförs med fokus på Oves bakgrundsberättelse och hur det

    påverkar Oves karaktär i nutid. Vidare analyseras filmens val av flashbacks med hjälp av

    Linda Aronsons teori om flashbacks användning och funktion. Analysens resultat visar att

    Oves bakgrund har stor betydelse för hur Ove agerar i nutid vilket leder till att Ove upplevs

    olika i de olika medierna.

  • 502.
    Wahlberg, Mats
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Fantomen och det gröna fältets schack: En studie av fotograferande av direktsänd fotboll med hjälp av multikopter.2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Jag har i denna undersökning studerat stilmässiga skillnader mellan bilder i flerkameraproducerad

    och fåkameraproducerad tv-sänd fotboll, samt hur en radiostyrd multikopter kan

    bidra som flygande bildproducerande verktyg i detta sammanhang. De teorier jag huvudsakligen

    stödde mig på var bildteori, fenomenologi, statistisk stilanalys och emotionell

    immersion.

    Forskningsfrågan formulerades på följande sätt: Vilka av de bilder som förekommer i en

    tv-sändning av en fotbollsmatch, lämpar sig multikoptermodellen Phantom 2 till att producera?

    Metoden byggde på tre steg, varav det första var att identifiera vilka bildtyper som förekomer

    i tv-sänd fotboll. I steg två analyserades stilskillnader mellan olika sändningar. Detta gav

    upphov till en kravlista att testa multikopterfotograferandet mot. I det tredje, explorativa

    steget, genomfördes test med verktyget baserat på kravlistan.

    Resultatet av studien var att upp till elva uppfattade kameror förekommer i tv-sänd fotboll.

    Av dessa lämpar sig fyra fullt ut för multikopterproduktion med den aktuella modellen och

    dess kamera, och en femte lämpar sig delvis.

    Slutsatsen är att multikoptern kan fylla en relevant roll som produktionsverktyg för tv-sänd

    fotboll, speciellt för fåkameraproduktioner som idag helt saknar flera av de bilder som multikoptern

    kan producera.

  • 503.
    Wahlberg, Olof
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Mobilising local entrepreneurship - experiences from a destination development2005In: The entrepreneurship - innovation - marketing interface : proceedings of the symposium, Karlsruhe, Künzelsau: Swiridoff , 2005, p. 524-Conference paper (Refereed)
  • 504.
    Wahlberg, Olof
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Strandberg, Christer
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Anderson, Karen
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Sirkemaa, Seppo
    Borglund, Erik
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    How a medium sized small enterprise uses ICT based marketing tools in its customer relationship management2009In: , 2009Conference paper (Refereed)
  • 505.
    Wahlberg, Olof
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Strandberg, Christer
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Anderson, Karen
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Sirkemaa, Seppo
    Turku University.
    Borglund, Erik A.M
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    How a Medium Sized Enterprise Applies the CRM Approach in its Marketing2009In: Proceedings of the 3rd European Conference on Information Management and Evaluation / [ed] Remenyi, D; Ljungberg, Jan; Grundén, Kerstin, Academic Conferences Limited , 2009, p. 448-459Conference paper (Refereed)
    Abstract [en]

    The purpose is to describe how a medium sized enterprise with an international scope, positive economic development, and relatively high ICT maturity applies the CRM approach in its marketing. Medium sized enterprises with these features are assumed to be role models for smaller enterprises, and in particular for smaller enterprises with growth ambitions. This case study is based on structured interviews conducted with the CEO and the manager responsible for IT and IS development in the enterprise. The findings show that the enterprise endorses a customer-oriented business strategy, supported by fairly simple information gathering and analysing methods; that the dependency on agents and dealers is a problem in an CRM perspective; and that the development of the Web offers new possibilities for CRM practices and policies.

  • 506.
    Wahlberg, Olof
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Strandberg, Christer
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Sundberg, Håkan
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Trends, Topics and Under-Researched Areas in CRM Research: A Literature Review2009In: International Journal of Public Information Systems, ISSN 1653-4360, Vol. 5, no 3, p. 191-208Article in journal (Refereed)
    Abstract [en]

    Purpose – The main purpose of this paper is to add to the image of CRM research by identifying trends and topics, using the perspective of CRM when it is divided into the four separate branches, namely those of Strategic CRM, Analytical CRM, Operational CRM and Collaborative CRM. In addition to this, the purpose is to identify under-researched areas in the body of CRM research in which there are research questions requiring to be addressed by means of further research.

    Design/methodology/approach – A review is made of articles in three major journals.

    Findings – The development of the number of CRM articles published in the journals signals a maturity within the CRM research field. Articles on Strategic and Analytical CRM dominate the research in this field. The focus has changed from Analytical to Strategic CRM, which is the most popular branch by the end of the period reviewed. There is a paucity of research with a resource based view in Strategic CRM. There is a large scale bias in CRM research.

    Research implications - Three implications for future research on CRM are noted: 1. There is need for more research within the area of Operational CRM and Collaborative CRM. 2. There is a need for research with a resource based view on CRM. 3. There is a need for more research on CRM in SMEs, using a frame of reference that accounts for SME features.

    Originality/value – The paper presents an image of the development of the CRM research field using an image of CRM that is well established, yet which has not been used in earlier literature reviews. It also points to the development of the CRM research field during the past two decades, including an increased focus on Strategic CRM. Furthermore, it points to voids in CRM research that call for further studies.

    Paper type – Literature review.

  • 507.
    Waldenby, Timothy
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Uppfattningen av modern instrumental progressiv metal: - En uppsats om människors reaktioner på musiken och uppfattning av genren2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats ämnar att redogöra för hur genren ”modern instrumental progressiv metal” uppfattas och hur uppfattningen skiljer sig från genren ”modern progressiv metal”- (där sång inkluderas). Uppsatsen redogör även för vilka fördomar som kan finnas mot genren. Till grund för uppsatsen så ligger svar från 25 respondenter som fått svara på ett frågeformulär. Undersökningen gick ut på att respondenterna fick lyssna på två låtar: det ena exemplet i genren ”modern instrumental progressiv metal” och det andra i genren ”modern progressiv metal”. För att ange hur de reagerade på låtarna så användes i frågeformuläret både frisvar och bundna svar, därmed så har både kvalitativ och kvantitativ data samlats in.

    Sammanfattningsvis går det att identifiera två tydliga läger hos respondenterna: de som uppfattade musiken positivt och blev taggade av den, samt de som upplevde negativa känslor så som stress. Vissa tyckte att det var jobbigt att lyssna på genren på grund av dess komplexitet i så väl låtstruktur som rytmer. Ett par delar av låten verkade ge upphov till liknande känslor hos de olika respondenterna, men i övrigt så uppfattades de många olika partierna relativt olika.

    När låtexemplet för modern progressiv metal spelades upp så var respondenterna mer överens om upplevda känslor som aggressivitet, självdestruktivitet och ilska/hat. Resultaten visade på att detta framförallt berodde på sångarens growl och skrik samt dissonanser hos gitarrerna.

  • 508.
    Wallin, Emil
    Dalarna University, School of Humanities and Media Studies, Moving Image Production.
    Berättande med ljus: En analys om ljus och ljussättning i filmen Confessions2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsen undersöker hur filmarbetare har arbetat med ljussättningen i filmen Confessions och vad ljuset gör för filmens berättande. Uppsatsen går in på hur man med hjälp av ljuset styr vart det är tittaren bör titta för att följa med i berättelsen och visar vad det är i bilden och ljuset som får tittaren att se det viktiga genom. Ljussättning och hur man har arbetat med ljuset i tysk expressionism och amerikansk film noir jämförs med hur det används i Confessions för att se om det finns några likheter mellan och skillnader. Uppsatsen går även in på om det finns några likheter samt skillnader i hur man har använt sig av ljuset och vad ljuset har för funktion i filmens berättande. Det jag kommer fram till i diskussionen är att man väldigt medvetet har jobbat med ljuset för att skapa ett obehag i filmen och det finns tydliga kopplingar till både tysk expressionism samt amerikansk film noir.

  • 509.
    Wallin, Patric
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Laws, Logs and Forensic Traceability: Case Study: Amazon Web Services & Cloud Watch2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis presents research around various aspects concerning log files. Forensic traceability within log files and how the Swedish law regulates saving them. It is mainly a literature study focusing on what information is to be saved within log files, but also when is a forensic investigation worth doing. Log files today is very important as it is the main source to get evidence of events and incidents. Within a log file there can be a lot of information fields, but are all of the information sent to a log file relevant? Most of the time it’s not. the most important fields are IP, Time, what did happen and why did it happen. Of course all of this cannot always be within one single log file, it needs to be correlated with IDS/IPS and other IT security Software and/or Hardware. A practical part of this work is the research around Cloud history/models/services, and how a company can get secure and reliable log files. Amazon Web Services is used for the practical part with its EC2, S3, Cloud Watch and Cloud Trail services.

  • 510.
    Wallin, Rickhard
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Varför låter det skit? "-Det är lugnt, det är punk!"2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Punk-musiken har fått kritik för att låta smutsig eller skräpig. Men enligt många punkfantaster är det så det ska låta, annars är det inte punk. Vad är det som gör att punken låter skräpigt, och varför? Vissa punkband som växer i popularitet får kritik om att inte längre vara punk när de byter sound, de blir mainstream enligt en del av fantasterna. Vad har soundet för betydelse för vad som är punk och inte? Syftet med undersökningen är att få en djupare förståelse för punkens sound. Dessutom undersöks vad soundet har för betydelse för skillnaden mellan vad som är "riktig punk" och vad som är mainstream. Tidigare forskning tar upp kulturella och tekniska aspekter som påverkar och formar punkens sound, såsom; DIY-kulturen, inspelningsmetod i studio, tekniska begränsningar, och producentrollens påverkan på soundet. Även skillnaden mellan riktig punk och mainstreampunk beskrivs. Teoriavsnittet tar upp teorier om begreppet "noise" och hur det används för att förklara hur individer uppfattar ljudideal. Gullös (2010) tredimensionella modell för musikproduktion används för att förklara producenters beteenden och ageranden under produktion. Kvalitativa intervjuer har använts som metod för att studera respondenternas resonemang och tankar kring punkens sound på ett djupare och friare sätt. Resultatet av intervjuerna genomgår sedan en analytisk fas där teori tillämpas för att uppnå svar på forskningsfrågorna. Analysen visar att punkens rötter är det som formar punkens sound, dvs; tekniska begränsningar och enkla inspelningsmetoder, vilket tillhör en äldre tid som många fantaster gärna förhåller sig till. Hur man förhåller sig till rötterna beror på hur viktiga de är för individen. Punken utvecklas likt all annan musik, och det gör även människans uppfattning av musik som därav skapar nya sorters sound hos punken. Bandet själva styr vilket sound de vill ha. Punkband som ändrar sound kan ibland ses som mainstream då fansen inte längre känner igen soundet eller genren. Det finns ingredienser som behövs för att punk ska vara punk, dock är det individuellt om vad man relaterar till och ser som punk, alltså finns det mer än bara punkens sound som avgör om vad som är riktig punk eller mainstream.

  • 511.
    Wan, Benting
    et al.
    Jiang Xi University of Finance and Economics.
    Qin, Y
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Path planning strategy of mobile nodes based on improved RRT algorithm2019In: Proceedings of 3rd International Conference on Computational Intellligence and Applications, IEEE, 2019, p. 228-234, article id 8711533Conference paper (Refereed)
    Abstract [en]

    The RRT algorithm is widely used in the high-dimensional path planning in a dynamic environment, and well adapted to the dynamics of motion of the mobile node needs. However, in large scale wireless sensor networks (WSN), the RRT algorithm lacks stability and is easy to deviate from the optimal path. In this paper we proposes a path planning algorithm called E-RRT to improve the problems that RRT has. The method proposed includes the coverage density of obstacle for initialize searching area for the exploring random tree, and the gradually extended region used to ensure the path to be found. The method also adopts the greedy algorithm to delete the intermediate point in the point sequence of path for an optimal path, and the quadratic Bezier curve to smooth the path for the mobile sensor node. The path found can be the shortest, collision-free and smoothing, and therefore to satisfy the requirement of path planning for mobile sensor nodes. The simulation results show that the E-RRT algorithm outperforms the RRT algorithm.

  • 512.
    Wande, Johan
    et al.
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Malm, Jens
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Mått för att mäta kodkvalitet undersystemutvecklingsprocessen2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The desire to ascertain a high level of quality on the code written during the development of systems and applications is not something new in the system development world. Several larger companies use different kinds of metrics to measure the quality of the code in their systems with the goal of maintaining high reliability and quality.Trafikverket is a government authority responsible for the operation of the system that keeps the Swedish railroad running. Their systems play an important part in ensuring the operation and to ensure that train positions, the planning of departures and error handling works around the clock for the entire country, they find it important and strive to maintain the high quality of the systems.The aim of this thesis was to find out which measurements may be possible to use during the system development process to measure the quality of the code and how measurements can be used to increase the quality of IT solutions. It should be possible to measure the quality of the code that is written in both existing and newly developed systems at an early stage. The study is a case study conducted at Trafikverket, the metrics that were examined were code coverage, the level of maintainability index and the number of reported incidents for each system. Measurements were performed on seven of Trafikverket's systems. In the analysis the measurements were compared to the number of reported incidents. Interviews were conducted to provide a picture of how the operation of the development may affect the quality. Through literature studies we discovered a metric that could not be used practically in this case, this was cyclomatic complexity, it is available as part of the maintainability index, but also separately affects the ability to write unit tests. The results of the study show that the measurements are useful for this purpose but should not be used as individual metrics to measure quality because they all have their own function. A clear link between the level of the code coverage and the number of incidents could be observed in the investigated systems where high code coverage provides a lower rate of incidents. No correlation between maintainability index and incidents could be found.

  • 513. Wang, J.
    et al.
    Liu, G.
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Firefly algorithm with proportional adjustment strategy2019Conference paper (Refereed)
    Abstract [en]

    Firefly algorithm is a new heuristic intelligent optimization algorithm and has excellent performance in many optimization problems. However, in the face of some multimodal and high-dimensional problems, the algorithm is easy to fall into the local optimum. In order to avoid this phenomenon, this paper proposed an improved firefly algorithm with proportional adjustment strategy for alpha and beta. Thirteen well-known benchmark functions are used to verify the performance of our proposed algorithm, the computational results show that our proposed algorithm is more efficient than many other FA algorithms.

  • 514.
    Weiberth, Fredrik
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Effektkartläggning som kravinsamlingsmetod för kommunala register: Hur kan Effektkartläggning användas som kravinsamling för kommunala register?2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Municipalities today use registers to store information about objects that fall under their area of responsibility, Falun municipality today uses IBM Notes to develop new registers but wants to move from this development alternative to keep the licenses within the business down. The purpose of this study is to elucidate how effect mapping can be used as a collection method for designing new registers and to see if they can choose a development alternative based on these requirements. An art register has been used as a user case for this work. When collecting requirements, there are many different methods, effect mapping is a method that focuses on the desired effects a new IT product should contribute to instead of technical functions. The result of an effect mapping becomes an effect map that can be used as a requirement specification which only contains those parts of the product that have an influence on the desired effects. The procedure for this work has been in the form of a case study that has had interviews as the main data collection method but also a document study on an existing register has been carried out. The interviews have been part of the effect mapping method but have also been used to collect data on strengths and weaknesses with different development tools and what is important to consider when collecting requirements. The result of impact mapping became an impact map that can be used as a basis for the design of an art register, based on the collected requirements and data from interview with senior developers, a connection has been made if it is possible to determine which development alternative would best suit the power map. The conclusion of work was that impact mapping can be a good method for capturing stakeholders' needs and wishes for a new IT product in order to be able to design the register with a focus on desired effects. The requirements that were developed could be linked to strengths and weaknesses with SharePoint, but in order to make a decision, other aspects should also be considered and explored.

  • 515.
    Westberg, Sofia
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Forensiska Undersökningar av Molntjänster2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The usage of cloud services has made forensics investigations more complicated. But there are good foundations if the cloud service providers would create services to retrieve all the information. It would make the process easier and more reliable.

    The most difficult part to do correctly is to download the information from the cloud services. The investigation is done in a volatile environment and not on a secured copy. It is possible that changes are made during the time the data is retrieved, which is not always visible. It is not possible to compare the differences in files with hash values, in the same way as forensic investigations of computers. That is why it is very important to document how the information is retrieved, preferably by recording the computer screen during the time the information is retrieved.

    The information is saved on multiple locations when the cloud services Office 365 and Google Apps are used, both in the cloud and on the computer that is being used to access the cloud. The web browser saves a lot of information of what has been done. That is why it is important to find out which computer has been used to connect to the cloud service, which is not possible today. If it would be possible to examine all the computer that have been used, evidence that is no longer in the cloud could be found,

    The best through a forensic angle would be if the cloud service providers offered to retrieve all data which involves a user, including all relevant logs. Then it would be possible to retrieve the data with a secure method, because it would not be possible to change the information during the retrieval. 

  • 516.
    Westgärds, Filip
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Tre skivbranschverksamma spekulerar: Är fullängdsalbum och fysisk skivdistribution snart ett minne blott?2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna kvalitativa studie är att undersöka hur skivbranschverksamma

    personer kan resonera kring inspelning av fullängdsalbum samt distribution av dessa nu

    i en tid när musik distribueras såväl genom digitala releaser som fysiska utgivningar.

    Forskningsfrågorna behandlar hur dessa personer ser på den intresseförändring som

    skett under de senaste 20 åren inom branschen gällande inspelning av fullängdsalbum,

    samt om man helst väljer att släppa musik digitalt eller på ett fysiskt medium. Intervjuer

    med tre stycken mycket erfarna personer inom skivbranschen har genomförts, där

    informanternas utsagor sedan har analyserats med begrepp hämtade från en darwinistisk

    teori. Undersökningens resultat indikerar att det har skett en intresseförändring under de

    senaste 20 åren och att skivbranschen idag fokuserar mer på digitala releaser än fysiska

    utgivningar samt att singlar premieras framför fullängdsalbum. Undersökningens

    resultat överensstämmer väl med den tidigare forskningen inom kunskapsområdet.

  • 517.
    Westin, Jerker
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Slutrapport PAULINA2015Report (Other academic)
  • 518.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Ahmed, M. U.
    Nyholm, D.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Groth, T.
    A fuzzy rule-based decision support system for Duodopa treatment in Parkinson's disease2006In: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 13, no s2, p. 214-214Article in journal (Other academic)
  • 519.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, D.
    Groth, T.
    A home environment test battery for status assessment in patients with motor fluctuations2006In: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 13, no s2, p. 213-214Article in journal (Other academic)
  • 520.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Ghiamati Yazdi, Samira
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Memedi, Mevludin
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, D.
    Johansson, A.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Groth, T.
    A successful computer method for assessing drawing impairment in Parkinson's disease2009In: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 16, p. 559-559Article in journal (Other academic)
  • 521.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Memedi, Mevludin
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Ghiamati Yazdi, Samira
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, Dag
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Groth, Torgny
    Defining a test score for status assessment during motor fluctuations in Parkinson's disease2009In: The Movement Disorder Society's 13th International Congress of Parkinson's Disease and Movement Disorders, Paris, 2009Conference paper (Refereed)
    Abstract [en]

    Objective: To define and evaluate a computer method for assessing drawing impairment in spiral drawings. To define an overall score, summarizing self-assessments and motor test data from a test battery for patients with advanced Parkinson's disease (PD). Background: A test battery, consisting of self-assessments (modified PDQ-8) and motor tests (tapping and spiral drawing) was developed for a hand computer with touch screen in a telemedicine setting. Assessments and tests were carried out four times per day in a group of 65 patients with advanced PD (Duodopa treated or candidates) during 1-6 weekly test periods each. For most test periods, UPDRS ratings were available. Methods: In a web interface, a PD specialist assessed drawing impairment in 505 selected spiral drawings, representing all categories on the Bain & Findley 10-category scale. A computer method, using wavelet transforms and principal component analysis, processed the same spirals to generate a 'spiral score'. According to the PD specialist and co-author Dr Nyholm, the information content of a test period with the test battery could be descibed by six dimensions, 'off', 'dyskinesia', 'walking', 'satisfaction', 'spiral', and 'tapping'. Each dimension was defined as the first principal component of the level (mean) and fluctuation (standard deviation) for the questions or tests that this dimension is based on. Tapping dimension was based on both speed and accuracy. To obtain weights for an overall score, linear regression of the dimensions vs. simultaneous UPDRS ratings was performed. To assess the internal consistency of the test battery, Cronbach's Alpha for the six dimensions was calculated. Results: Pearson correlation between spiral score and clinical rating of drawing impairment was 0.87. Weights in overall test score were (%): spirals, 41, tapping, 24, satisfied, 19, dyskinetic, 10, walking, 5.4 and off, 0.1. Internal consistency for the dimensions was 0.81. Conclusions: The computer generated spiral score was strongly correlated to clinical assessment of drawing impairment. Spirals were assigned highest weight in overall score, reflecting the high weight of motor function in total UPDRS. Internal consistency was strong, implying all dimensions represent aspects of a common characteristic.

  • 522.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, Dag
    Groth, Torgny
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Yerramsetty, Praveen
    Pålhagen, Sven
    Outcome prediction of enteral levodopa/carbidopa infusion in advanced Parkinson's disease2006In: Parkinsonism & Related Disorders, ISSN 1353-8020, E-ISSN 1873-5126, Vol. 12, no 8, p. 509-513Article in journal (Refereed)
    Abstract [en]

    Two studies comparing intraduodenal infusion of a levodopa/carbidopa gel with oral treatments in advanced PD patients, demonstrated improvement in UPDRS scores and in frequent clinical ratings on a global treatment response scale. Further analysis of data from these studies was performed to find predictive factors related to degree of improvement with infusion. Pearson correlation coefficients between measures of improvement and baseline variables were calculated. Using data from one study, a prediction model was designed and was then evaluated using the other study’s data. Correlations were found indicating that patients with more severe symptoms at baseline were most improved after infusion.

  • 523.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, Dag
    Pålhagen, Sven
    Willows, Thomas
    Groth, Torgny
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Karlsson, Mats
    A pharmacokinetic-pharmacodynamic model for duodenal levodopa infusion2011In: Clinical neuropharmacology, ISSN 0362-5664, E-ISSN 1537-162X, Vol. 32, no 2, p. 61-65Article in journal (Refereed)
    Abstract [en]

    Objective: The purpose of this work was to identify and estimate a population pharmacokinetic- pharmacodynamic model for duodenal infusion of a levodopa/carbidopa gel (Duodopa) to examine pharmacological properties of this treatment.

    Methods: The modeling involved pooling data from 3 studies (on advanced Parkinson disease) and fixing some parameters to values found in literature. The first study involved 12 patients studied on 3 occasions each and was previously published. The second study involved 3 patients on 2 occasions. A bolus dose was given after a washout during night. Plasma samples and motor ratings (clinical assessment of motor function on a 7-point treatment response scale ranging from "very off" to "very hyperkinetic") were collected until the clinical effect returned to baseline. The third study involved 5 patients on 3 occasions receiving 5 different dose levels. Different structural models were evaluated using the nonlinear mixed-effects modeling program NONMEM VI. Population mean parameter values, and interindividual, interoccasion, and residual variabilities were estimated.

    Results: Absorption of the levodopa/carbidopa gel can be adequately described with first-order absorption with bioavailability and lag time. Estimated population parameter values were a mean absorption time of 28.5 minutes, a lag time of 2.9 minutes, and a bioavailability of 88%. The pharmacodynamic model for motor ratings had the following population values: a half-life of effect delay of 21 minutes, a concentration at 50% effect of 1.55 mg/L, an Emax of 2.39 U on the treatment response scale, and a sigmoidicity of the Emax function of 11.6.

    Conclusions: For the typical unmedicated subject, it will take 51.4 minutes until the peak levodopa effect is reached after a bolus dose. This delay is, like the magnitude of the effect, highly variable in this patient group. The residual error magnitudes of 20% for levodopa concentrations and 0.92 U (SD) for motor ratings indicate that the models developed provide predictions of a relevant quality. The developed model may be a first step toward model-guided treatment individualization of duodenal infusion of levodopa.

  • 524.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Schiavella, Mauro
    Memedi, Mevludin
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyholm, Dag
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Antonini, Angelo
    Validation of a home environment test battery for supporting assessments in advanced Parkinson's disease2012In: Neurological Sciences, ISSN 1590-1874, E-ISSN 1590-3478, Vol. 3, no 4, p. 831-838Article in journal (Refereed)
    Abstract [en]

    Test sequences in a test battery for Parkinson’s disease patients, consisting of self-assessments and motor tests, were carried out repeatedly in a telemedicine setting, during week-long test periods and results were summarized in an ‘overall score’. 35 patients in stable and fluctuating conditions (15 age- and gender-matched pairs) used the test battery for 1 week, and were then assessed with UPDRS and PDQ-39. This procedure was repeated 1 week later, without treatment changes. Reliability was assessed by intraclass correlation coefficients and Cronbach’s alpha. Convergent validity was assessed by Spearman rank correlations and known-groups’ validity, by the Mann–Whitney test. According to anonymous usability questionnaires, the patients could easily complete the tasks. Median compliance (93%) and test–retest reliability (0.88) were good. The correlations between overall score and total UPDRS (-0.64) and PDQ-39 (-0.72) were adequate. Median overall score was 18% better in the stable compared to the fluctuating group (p = 0.0014).

  • 525.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Stenberg, Georg
    Psychology, Kristianstad univ.
    Development of a test for spatial working memory in Parkinson's disease: sensitivity to medication induced periodic performance changes2012In: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 19, no s1, p. 551-551Article in journal (Refereed)
  • 526.
    Westin, Jerker
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Willows, T.
    Groth, T.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Palhagen, S.
    Pedal: Identification of models for duodenal administration of levodopa2006In: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 13, no s2, p. 220-221Article in journal (Other academic)
  • 527.
    Westling, Jonas
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Pengarna som inte kommer fram: Den ekonomiska fördelningsproblematiken i klubbmusik Sverige 20152016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats problematiserar hur kollektiva förvaltningsorganisationer fördelar pengar

    insamlade från offentligt framförd klubbmusik samt undersöker hur etablerade dj’s och

    producenter ser på dagens system och tror sig påverkas av detta. Med djupintervjuer av

    fyra personer undersöker uppsatsen även hur dessa ser på rapportering av den spelade

    musiken, vilka problem som kan uppstå och om det finns tekniska möjligheter att

    underlätta för korrekt fördelning. Resultaten visar att intervjupersonerna skiljer sig åt i

    vilken typ av karriär de har och därmed hur man förhåller sig till dagens system. Ingen

    ställde sig dock positiv till att rapportera in spellistor med vad de spelat som dj’s, man

    lyfte även fram problemet med att ersätta musik som spelas men ännu inte släppts

    officiellt. Det framkom också att vi idag har tekniska möjligheter att övervaka vad som

    spelas genom användandet av akustiska fingeravtryck. Jag diskuterade att det är först

    när ett sådant system är på plats som vi kan se hur mycket fel dagens pengar fördelas.

  • 528.
    Wikberg, Rasmus
    Dalarna University, School of Humanities and Media Studies, Moving Image Production.
    Zorn, två berättelser: En jämförelse mellan filmen Zorn och biografin Emma Zorn2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Anders Zorn var en av världens främste konstnärer kring sekelskiftet 1900. Han levde ett

    innehållsrikt och hektiskt liv tillsammans med hustrun Emma Zorn. Uppsatsen syftar till att

    jämföra två berättelser om Zorn. Gunnar Hellström gjorde 1994 spelfilmen Zorn som handlar

    om en del ur makarna Zorns liv. Denna film jämförs med Birgitta Sandströms biografi Emma

    Zorn som behandlar samma period som skildras i filmen på ett detaljerat sätt.

    Frågeställningarna som uppsatsen utgår ifrån är: Hur skiljer sig Birgitta Sandströms bild av

    Anders Zorn från den Gunnar Hellström målar upp i sin film Zorn och är det möjligt att peka

    på några speciella aspekter som skiljer sig mer än andra? Samt vad kan skillnaderna mellan

    berättelserna bero på? Syftet är att belysa likheter och skillnader mellan dessa verk för att

    påvisa att det alltid förekommer tolkningar, både av upphovsmannen men också hos

    åskådaren samt att de val upphovsmannen gör har betydelse. Det finns flera delar ur filmen

    som stämmer överens med biografins beskrivning men det finns också stora skillnader.

    Generellt skildras makarna Zorns liv mer dramatiskt och negativt i Hellströms film jämfört

    med i biografin. Det går att peka på framförallt tre aspekter av Zorns liv som skiljer sig mer

    än andra. Dessa är makarna Zorns stormiga förhållande, Zorns oäkta barn och älskarinnor

    samt Emma Zorn som en mycket inaktiv och hemmasittandes person. Det som skiljer sig mest

    mellan filmen och biografin är det sistnämnda.

  • 529.
    Wiksell, Peter
    et al.
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Ryberg, Alexander
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Utveckling av webbaserad kompetenshanterings-prototyp som grund för bemanning av projekt2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today, more organizations are dependent on the competence of their employees. Previous studies have shown that one can use IT systems to support competence management. There are several problems with the systems. One of them is to update the competence, if it isn’t updated the competence becomes less and less useful to the organization. Another problem with implementing a competence management system is to design a competency framework. The purpose of this study is to highlight the problems associated with the development of competence management systems. The research strategy used is Design and Creation and the development model used is prototyping. The prototype was evaluated by demonstrations for end users. The essay knowledge contribution is to show how a system for competence management can be built to address the problems above.

  • 530.
    Wikström, Daniel
    et al.
    Dalarna University, School of Technology and Business Studies, Statistics.
    Brandt, Daniel
    Dalarna University, School of Technology and Business Studies, Human Geography.
    Heldt, Tobias
    Dalarna University, School of Technology and Business Studies, Economics.
    A business intelligence solution of handling traveling data with R and Shiny2016In: Proceedings of the IFITTtalk@Östersund Workshop on Big Data & Business Intelligence in the Travel & Tourism Domain / [ed] Fuchs, M., Lexhagen, M. & Höpken, W., 2016Conference paper (Refereed)
  • 531.
    Wilhelmsson, Tobias
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Undersökning av GDPR och NIS samt dess betydelse för enkla hemsidor2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I detta arbetet har det genomförts två undersökningar. Den ena undersökningen handlar om GDPR och den andra om NIS. Dessa två regelverk är skapade av EU för att säkra upp när det gäller cyberattacker och att styrka individers möjlighet att hantera sina personuppgifter. Det har även skapats en enkel hemsida i arbetet. Denna hemsidan är ett experiment för att ta reda på vad någon som äger eller tillhandahåller en enkel hemsida bör tänka på när det kommer till GDPR och NIS. Hemsidan i sig är tänkt att ge möjlighet för människor att träffa andra med samma intresse eller träffa de som befinner sig i liknande livssituationer. GDPR är en förnyelse av Sveriges tidigare lag PUL. GDPR är en förordning från EU vilket innebär att den måste följas mer noggrant än PUL. PUL var ett direktiv från EU. Ett direktiv väger inte lika tungt som en förordning. GDPR ger EU:s medlemsländers medborgare starkare rättigheter till deras personuppgifter. Det innebär att de har rätt att veta vad och varför personuppgifter hanteras. De har även rätt till radering vilket innebär att en organisation måste radera personuppgifter om de inte längre har någon anledning att fortsätta behandla dem. Det kan handla om rättslig påverkan eller en intresseavvägning om en personuppgift får behandlas vidare eller inte. NIS är som sagt skapat av EU, detta är ett direktiv som beskrivit lite tidigare i detta stycke vad det innebär. Här har EU:S medlemsländer lite friare händer. Det finns mål som skall uppfyllas men medlemsländerna får själva bestämma hur målen skall uppnås. NIS handlar om cybersäkerheten inom EU. Det gäller att stärka den lägstanivå som finns. Jobba med att vara bättre förberedd om en incident skulle inträffa och på så sätt ge ett bättre grundskydd mot cyberattacker. Vad gäller en enkel hemsida så har GDPR en del att säga till om. Om man sparar data i en databas så skall de som personuppgifterna tillhör veta om det och samtycka till det. Det skall även kunna gå att få fram informationen som är sparad om personerna och även radering av personuppgifter om så önskas. En registrerad skall kunna få information om personuppgifter som sparas hos en personuppgiftsbehandlare utan att betala för det. När det gäller NIS och enkla hemsidor så är det i regel inget som rör den som tillhandahåller hemsidan eller hemsidans ägare. Det krävs i så fall att det är större företag med stor omsättning och som har huvudkontor i Sverige.

  • 532.
    Windahl, Sandra
    Dalarna University, School of Humanities and Media Studies, Sound and Music Production.
    Musikens maskuliniteter: En kvalitativ studie kring könshierarkier i musikbranschen ur ett feministiskt perspektiv2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsen faller inom ämnesområdet musikproduktion, där yrket musikproducent

    studeras ur ett feministiskt perspektiv. Studien utgår från att kvinnliga

    musikproducenter är underrepresenterade i Sverige och att musikproduktion i större

    drag är synonymt med manlighet. Med utgångspunkt av Equalizerprojektet, vars mål är

    att på snabbare sikt göra musikbranschen mer jämställd, syftar den här studien till att

    analysera manliga musikproducenters tankar och upplevelser av branschen.

    Genom en kvalitativ metod har semistrukturerade intervjuer gjorts med fyra verksamma

    manliga musikproducenter under november månad år 2017. Respondenternas

    reflektioner har sedan analyserats utifrån pionjärer inom feminism och

    maskulinitetsforskning. Genom dessa teorier får vi en inblick i komplexa hierarkier, där

    män kategoriseras i underordnade, överordnade och delaktiga maskuliniteter, varpå

    några av dessa maskulina beteenden är med och bidrar till en icke jämställd

    musikbransch.

    Efter studien konstateras att samtliga respondenter tillhör en underordnad maskulinitet

    där de själva anser sig vara besvärade av en dominant manlighet som är starkt rådande

    inom yrket. De upplever att det ger utdelning att anamma samma starka maskulina

    jargong, vilket bidrar till att den dominanta maskuliniteten upprätthålls. Två av

    respondenterna påvisar en stark feministiskt medvetenhet, både på strukturell nivå samt

    individnivå. Resterande respondenter visar en positiv inställning till att musikbranschen

    bör bli mer jämställd, samtidigt som de själva anser att de skulle kunna göra mer för att

    förändra rådande strukturella normer.

  • 533.
    Wretlind, Kristoffer
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Separation av resurser i molntjänstarkitekturer: Separation of Resources in Cloud Architectures2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Molnet är ett evolutionärt koncept som erbjuder en konkurrenskraft – och kostnadskontroll för företag

    genom att integrera olika och existerande teknik. Molnet avser både applikationer som levereras som

    tjänst över Internet, och hårdvara – och mjukvara som tillhandahålls i dessa tjänster. För att kunna dra

    nytta av pris – och prestationsfördelar som molnet erbjuder innebär det att resurser är konsoliderade

    mellan flera kunder i samma infrastruktur. Det är med hänsyn till en konsoliderad miljö som isolering

    av kunders resurser är särskilt viktigt att beakta. Syftet med min studie är att identifiera de risker

    gällande separation av resurser som medföljer en molnbaserad infrastruktur, och lyfta fram olika

    mekanismer för att säkert tillgodogöra behovet, samt att belysa homomorfisk kryptering som en

    separationsmekanism. I uppsatsens litteraturstudie presenterar jag de väsentliga risker som gäller

    separation av resurser från andra kunder och från leverantören, och vanligt förekommande logiska

    separationsmekanismer och deras funktioner som riskåtgärder för de presenterade riskerna. Läran om

    kryptografi sammanfattas i syftemål att presentera homomorfisk kryptering och dess anknytning till

    resursseparation. Litteraturstudier och intervjuer med såväl kunder som leverantörer av molntjänster

    har berett mig ett underlag för att kunna utvärdera de presenterade mekanismerna. Studiens resultat

    visade att stark isolering från andra kunder kan uppnås, men att det är problematiskt att fullständigt

    separera resurser från leverantören. Resultatet har dessutom visat att krypteringsalgoritmer som är

    homomorfiska kan vara säkra men brister i dess ineffektivitet att praktiskt kunna tillämpas.

  • 534. Yan, Su-Rong
    et al.
    Zheng, Xiao-Lin
    Wang, Yan
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Zhang, Wen-Yu
    A graph-based comprehensive reputation model: exploiting the social context of opinions to enhance trust in social commerce2015In: Information Sciences, ISSN 0020-0255, E-ISSN 1872-6291, Vol. 318, p. 51-72Article in journal (Refereed)
    Abstract [en]

    Social commerce is a promising new paradigm of e-commerce. Given the open and dynamic nature of social media infrastructure, the governance structures of social commerce are usually realized through reputation mechanisms. However, the existing approaches to the prediction of trust in future interactions are based on personal observations and/or publicly shared information in social commerce application. As a result, the indications are unreliable and biased because of limited first-hand information and stake-holder manipulation for personal strategic interests. Methods that extract trust values from social links among users can improve the performance of reputation mechanisms. Nonetheless, these links may not always be available and are typically sparse in social commerce, especially for new users. Thus, this study proposes a new graph-based comprehensive reputation model to build trust by fully exploiting the social context of opinions based on the activities and relationship networks of opinion contributors. The proposed model incorporates the behavioral activities and social relationship reputations of users to combat the scarcity of first-hand information and identifies a set of critical trust factors to mitigate the subjectivity of opinions and the dynamics of behaviors. Furthermore, we enhance the model by developing a novel deception filtering approach to discard "bad-mouthing" opinions and by exploiting a personalized direct distrust (risk) metric to identify malicious providers. Experimental results show that the proposed reputation model can outperform other trust and reputation models in most cases. (C) 2014 Elsevier Inc. All rights reserved.

  • 535.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Automatically detecting the number of logs on a timber truck2013In: Journal of Intelligent Systems, ISSN 2191-026X, Vol. 22, no 4, p. 417-435Article in journal (Refereed)
    Abstract [en]

    This article describes a method of automatically detecting, counting and classifying logs on a timber truck using a photograph (taken by the driver). An image-processing algorithm is developed to process the photograph to calculate an estimate of the number of logs present and their respective diameters. The algorithm uses color information in multiple color spaces as well as geometrical operators to segment the image and extract the relevant information. This information enables the sawmill to better plan internal logistics and production in advance of the truck’s arrival time. The algorithm is robust with respect to external factors such as varying lighting conditions and camera angle, but some inaccuracies remain, mainly caused by logs being occluded or covered in mud or snow.

  • 536.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, N K
    Artificial Intelligence techniques for the automatic interpretation of data from non-destructive testing2006In: Insight (Northampton), ISSN 1354-2575, E-ISSN 1754-4904, Vol. 48, no 1, p. 10-20Article in journal (Other academic)
    Abstract [en]

    This paper attempts to summarise the findings of a large number of research papers deploying artificial intelligence (AI) techniques for the automatic interpretation of data from non-destructive testing (NDT). Problems in the rail transport domain are mainly discussed. However, a majority of the emphasis in this paper is laid on rail inspection problems, since it was believed that the review would provide a perfect ground to the authors in pursuing further work within the rail inspection area. NDT is a broad name for a variety of methods and procedures concerned with all aspects of uniformity, quality and serviceability of materials and structures, without causing damage to the material that is being inspected. During the past several years, problems concerning the automatic interpretation of data from NDT have received good attention and have stimulated interests in other areas like transportation, for making key assessments within some of its subject areas. Rail, air and marine industries together with bridge inspection and pavement maintenance are good examples of such areas where a considerable amount of work has been done. Such work neatly splits into two schools. The first school investigates the classical usage of data by an experienced human operator to determine the condition of the inspected material or structure. The other school focuses attention on the automatic interpretation of NDT data using AI techniques, in determining the result of inspection. The scope of this paper is only limited to the automatic interpretation of data from NDT, with the goal of assessing embedded flaws as quickly and accurately as possible in a cost effective fashion. AI techniques such as neural networks, machine vision, knowledge-based systems and fuzzy logic were applied to a wide spectrum of problems in the area. A secondary goal was to provide an insight into possible research methods concerning railway sleeper inspection by automatic interpretation of data. A brief introduction is provided for the benefit of the readers unfamiliar with the techniques.

  • 537.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Narendra
    Fuzzy logic approach for automating visual condition monitoring of railway sleepers2007In: IICAI, Indian International Conference on Artificial Intelligence, Pune, India, 2007Conference paper (Other academic)
  • 538.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Narendra K.
    Condition monitoring of wooden railway sleepers2009In: Transportation Research Part C: Emerging Technologies, ISSN 0968-090X, E-ISSN 1879-2359, Vol. 17, no 1, p. 38-55Article in journal (Refereed)
    Abstract [en]

    Wooden railway sleeper inspections in Sweden are currently performed manually by a human operator; such inspections are to large extent based on visual analysis. In this paper a machine vision based approach has been considered to emulate the visual abilities of the human operator to enable automation of the process. Digital images from either ends (left and right) of the sleepers have been acquired. A pattern recognition approach has been adopted to classify the condition of the sleeper into classes (good or bad) and thereby achieve automation. Appropriate image analysis techniques were applied and relevant features such as the number of cracks on a sleeper, average length and width of the crack and the condition of the metal plate were determined. Feature fusion has been proposed in order to integrate the features obtained from each end for the classification task which follows. The effect of using classifiers like multi-layer perceptron and support vector machines has been tested and compared. Results obtained from the experiments show that multi-layer perceptron and support vector machines have achieved encouraging results, with a classification accuracy of 90%; thereby exhibiting a competitive performance when compared to a human operator.

  • 539.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Narendra K.
    Data fusion for automating condition monitoring of wooden railway sleepers2008In: Insight (Northampton), ISSN 1354-2575, E-ISSN 1754-4904, Vol. 50, no 7, p. 356-363Article in journal (Other academic)
    Abstract [en]

    Wooden railway sleeper inspections in Sweden are currently done by hand. That is to say, a human inspector in charge of the maintenance activities visually examines each structure in turn for the presence of cracks on the sleeper. Where necessary some deeper inspection may be carried out on site, for example using an axe to hit and judge the condition of the sleeper by listening to the sound produced. Though the manual procedure uses non-destructive testing methods (visual and sound analysis), decision-making is largely based on intuition; moreover the process is rather slow, expensive and also requires skilled and trained staff. Maintaining an even quality standard is another serious issue. Hence, it is desired to automate the human inspection process by proposing automatic testing procedures for future inspections concerning the condition of the sleeper. Studies based on emulation of the human inspection process have been considered a promising route of enquiry for automation. Such an emulation process is achieved by selecting and evaluating two non-destructive inspection methods. The first method (impact acoustic analysis) aims to build an automatic system to replace the usage of an axe for distinguishing sounds. The second method (visual analysis) is to develop an appropriate machine vision algorithm to replicate the visual examination. Further, the above-mentioned methods were fused (data fusion) to generate a single output condition concerning the condition of the sleeper. In the current work, fusion has been achieved in mainly three levels, namely sensor-level, feature-level and classifier-level. Experimental results achieved in this work indicate that data fusion has achieved superior performance when compared with using data from one method at a time.

  • 540.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Ghiamati, Samira
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Condition monitoring of wooden railway sleepers using time-frequency techniques and pattern classification2009In: Systems, Man and Cybernetics, 2009. SMC 2009. IEEE International Conference on Systems, San Antonio, Texas, USA, 2009, p. 4164-4169Conference paper (Refereed)
    Abstract [en]

    Railway sleepers are a key engineering element of all railways. Lack of much sophistication in monitoring railway sleepers makes it a key problem within the rail transportation domain. Current day condition monitoring applications involving wooden railway sleepers are mostly carried out through visual inspection and if necessary some impact acoustic examination is carried out. Decision making is largely based on intuition; moreover the process of manually inspecting sleepers is rather slow and expensive. Maintaining an even quality standard is another serious issue. In this article, a pattern recognition and classification approach is taken to automate such intuitive human skills for the development of more robust and reliable testing methods. Features were extracted from the impact acoustic emissions of wooden sleepers and were used for pattern classification. Time-frequency based feature extraction techniques such short-time Fourier transform and discrete wavelet transform yielded good results. Multi-layer perceptron, radial basis function neural networks and support vector machine classifiers have been tested and compared. Further classifier fusion was investigated by considering the output of single best classifiers as input to a new classifier with an aim of improving performance. Results obtained experimentally demonstrate a classification accuracy of around 84%.

  • 541.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Naredra K.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Automating condition monitoring of wooden railway sleepers2007In: EngineerIT, ISSN 1991-5047, Vol. 2, no 10Article in journal (Other academic)
  • 542.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Naren
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Condition monitoring using pattern recognition techniques on data from acoustic emissions2006In: ICMLA 2006: 4th International Conference on Machine Learning and Applications, Proceedings, 2006Conference paper (Other academic)
    Abstract [en]

    Condition monitoring applications deploying the usage of impact acoustic techniques are mostly done intuitively by skilled personnel. In this article, a pattern recognition approach is taken to automate such intuitive human skills for the development of more robust and reliable testing methods. The focus of this work is to use the approach as a part of a major research project in the rail inspection area, within the domain of Intelligent Transport Systems. Data from impact acoustic tests made on wooden beams have been used. The relation between condition of the wooden beams and respective sounds they make when struck, has been analyzed experimentally. Features were extracted from the acoustic emissions of wooden beams and were used for pattern classification. Features such as magnitude of the signal, natural logarithm of the magnitude and Mel-frequency cepstral coefficients, yielded good results. The extracted feature vectors were used as input to various pattern classifiers for further pattern recognition task. The effect of using classifiers like Support vector machines and Multi-layer perceptron has been tested and compared. Results obtained experimentally, demonstrate that Support vector machines provide good detection rates for the classification of impact acoustic signals in the NDT domain.

  • 543.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Gupta, Narendra
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Comparison of pattern recognition techniques for the classification of impact acoustic emissions2007In: Transportation Research Part C: Emerging Technologies, ISSN 0968-090X, E-ISSN 1879-2359, Vol. 15, no 6, p. 345-360Article in journal (Refereed)
    Abstract [en]

    Current day condition monitoring applications involving wood are mostly carried out through visual inspection and if necessary some impact acoustic examination is carried out. These inspections are mainly done intuitively by skilled personnel. In this paper, a pattern recognition approach has been considered to automate such intuitive human skills for the development of robust and reliable methods within the area. The study presents a comparison of several pattern recognition techniques combined with various stationary feature extraction techniques for classification of impact acoustic emissions. Further issues concerning feature fusion are discussed as well. It is hoped that this kind of broad analysis could be used to handle a wide spectrum of tasks within the area, and would provide a perfect ground for future research directions. A brief introduction to the techniques is provided for the benefit of the readers unfamiliar with the techniques. Pattern classifiers such as support vector machines, etc. are combined with stationary feature extraction techniques such as linear predictive cepstral coefficients, etc. Results from support vector machines in combination with linear predictive cepstral coefficients delivered good classification rates. However, Gaussian mixture models delivered higher classification rates when feature fusion is proposed.

  • 544.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Nyberg, Roger G
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Gupta, Narendra K.
    Edinburgh Napier University.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Reliability of manual assessments in determining the types of vegetation on railway tracks2015In: Web Information Systems Engineering – WISE 2015: 16th International Conference, Miami, FL, USA, November 1-3, 2015, Proceedings, Part II / [ed] Wang, J., Cellary, W., Wang, D., Wang, H., Chen, S.-C., Li, T., Zhang, Y., Springer, 2015, Vol. 9149, p. 391-399Conference paper (Refereed)
    Abstract [en]

    Current day vegetation assessments within railway maintenance are (to a large extent) carried out manually. This study has investigated the reliability of such manual assessments by taking three non-domain experts into account. Thirty-five track images under different conditions were acquired for the purpose. For each image, the raters’ were asked to estimate the cover of woody plants, herbs and grass separately (in %) using methods such as aerial canopy cover, aerial foliar cover and sub-plot frequency. Visual estimates of raters’ were recorded and analysis-of-variance tests on the mean cover estimates were investigated to see whether if there were disagreements between the raters’.  In tra-correl ation coefficient was used to study the differences between the estimates. Results achieved in this work revealed that seven out of the nine analysis-of-variance tests conducted in this study have demonstrated significant difference in the mean estimates of cover (p < 0.05).

  • 545.
    Yella, Siril
    et al.
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Shaik, Asif ur Rahman
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Dougherty, Mark
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Pattern recognition for classifying the condition of wooden railway sleepers2010In: Multimedia Computing and Information Technology (MCIT), 2010 International Conference on Multimedia Computing and Information Technology, Sharjah, 2010, p. 61-64Conference paper (Refereed)
    Abstract [en]

    This paper summarises the results of using a pattern recognition approach for classifying the condition of wooden railway sleepers. Railway sleeper inspections are currently done manually; visual inspection being the most common approach, with some deeper examination using an axe to judge the condition. Digital images of the sleepers were acquired to compensate for the human visual capabilities. Appropriate image analysis techniques were applied to further process the images and necessary features such as number of cracks, crack length etc have been extracted. Finally a pattern recognition and classification approach has been adopted to further classify the condition of the sleeper into classes (good or bad). A Support Vector Machine (SVM) using a Gaussian kernel has achieved good classification rate (86%) in the current case.

  • 546. Yu, Z.
    et al.
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Zheng, X.
    Chen, D.
    Combining trust propagation and topic-level user interest expansion in recommender systems2016In: International Journal of Web Services Research, ISSN 1545-7362, E-ISSN 1546-5004, Vol. 13, no 2, p. 1-19Article in journal (Refereed)
    Abstract [en]

    With the development of E-commerce and Internet, items are becoming more and more, which brings a so called information overload problem that it is hard for users to find the items they would be interested in. Recommender systems emerge to response to this problem through discovering user interest based on their rating information automatically. But the rating information is usually sparse compared to all the possible ratings between users and items. Therefore, it is hard to find out user interest, which is the most important part in recommender systems. In this paper, we propose a recommendation method TT-Rec that employs trust propagation and topic-level user interest expansion to predict user interest. TT-Rec uses a reputation-based method to weight users' influence on other users when propagating trust. TT-Rec also considers discovering user interest by expanding user interest in topic level. In the evaluation, we use three metrics MAE, Coverage and F1 to evaluate TT-Rec through comparative experiments. The experiment results show that TT-Rec recommendation method has a good performance. 

  • 547.
    Yu, Zukun
    et al.
    Zhejiang University.
    Song, William Wei
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Zheng, Xiaolin
    Zhejiang University.
    Chen, Deren
    Zhejiang University.
    A Recommender System Model Combining Trust with Topic Maps2013In: World Wide Web: Internet and Web Information Systems: APWeb 2013, 2013Conference paper (Refereed)
    Abstract [en]

    Recommender Systems (RS) aim to suggest users with items that they might like based on users' opinion on items. In practice, information about the users' opinion on items is usually sparse compared to the vast information about users and items. Therefore it is hard to analyze and justify users' favorites, particularly those of cold start users. In this paper, we propose a trust model based on the user trust network, which is composed of the trust relationships among users. We also introduce the widely used conceptual model Topic Map, with which we try to classify items into topics for Recommender analysis. We novelly combine trust relations among users with Topic Maps to resolve the sparsity problem and cold start problem. The evaluation shows our model and method can achieve a good recommendation effect.

  • 548.
    Zakrisson, Emma
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    En granskning av personuppgifters flöde genom Falu kommuns gymnasiala Vuxenutbildning i enlighet med General Data Protection Regulation, GDPR2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    On May 25, 2018, the EU's new data protection regulation will come into force throughout the EU. The English name of this regulation is the Data Protection Regulation which is shortened GDPR. The purpose of the new data protection regulation is to ensure people's right to protection of their personal data, which will strengthen personal integrity in an increasingly digitized world. This will be done by establishing rules for the free flow of personal data within the EU. The Data Protection Regulation will place high demands on organizations that have to undergo major change efforts to comply with the regulatory requirements.

    One of the aims of this study has been to investigate whether the operation of the adult education within the municipality of Falun is sustainable in view of the requirements of the new data protection regulation. With this as a starting point, a review of the handling of personal data has been identified. One of the study's issues has been to identify critical points in the adult education activities where personal data incidents could occur. In the study, mixed techniques have been used to gather the necessary information in relation to the questions. Literature studies have been conducted in the field of data protection regulation and information security in general. In addition, gathering of empirical data has been done through oral and written interviews with selected key persons in the organization. Based on this information, a mapping and analysis has been made, which has resulted in an evaluation of the organizations processes in which personal data are handled. With that as a starting point, the questions have been as critical points have been identified and recommended working methods have been presented.

    The study's results show that the municipality of Falun has begun adaptation work to meet the requirements of the new data protection regulation. However, the work has started so late that you still have a lot of work left to implement in the organization. The Data Protection Regulation was adopted on April 27, 2016, which means that in practice they have had at least two years to prepare. For Falun municipality to meet the new requirements of the Data Protection Regulation, key factors are the management's commitment and understanding, as well as the implementation of custom education for all staff in the organization. The study also shows that the adaptation to the new data protection regulation is a continuous work, which should be achieved systematically over time.

    In the environmental surveillance of other municipalities, many have begun their work with an adaptation to the new data protection regulation. These are, like the municipality of Falun, far from fully prepared for the data protection regulation to enter into force on May 25, 2018.

  • 549.
    Zhang, Fan
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    A hybrid structured deep neural network with Word2Vec for construction accident causes classification2019In: International Journal of Construction Management, ISSN 1562-3599Article in journal (Refereed)
    Abstract [en]

    According to the latest fatal work injury rates reported by the Bureau of Labors Statistics, construction sites remain the most hazardous workplaces. In the construction sector, fatality investigation summary reports are available for past accidents and by investigating such reports, valuable insights can be gained. In this study, text mining algorithms are explored for automatic construction accident causes classification. To be more specific, Word2Vec skip-gram model is utilized to learn word embedding from a domain-specific corpus and a hybrid structured deep neural network is proposed by incorporating the learned word embedding for accident reports classification. Dataset from Occupational Safety and Health Administration (OSHA) is employed in the experiment to evaluate the performance of the proposed approach. Besides, five baseline models: support vector machine (SVM), linear regression (LR), K-nearest neighbor (KNN), decision tree (DT), Naive Bayes (NB) are employed to compare with the proposed approach. Experiment results show that the proposed model achieves the highest average weighted F1 score among all models considered in this study. The result also proves the effectiveness of applying Word2Vec skip-gram algorithm for semantic information augmentation. As a result, robustness of the model is improved when classifying cases of low support values.

  • 550.
    Zhang, Fan
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Fleyeh, Hasan
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Wang, X.
    Lu, M.
    Construction site accident analysis using text mining and natural language processing techniques2019In: Automation in Construction, ISSN 0926-5805, E-ISSN 1872-7891, Vol. 99, p. 238-248Article in journal (Refereed)
    Abstract [en]

    Workplace safety is a major concern in many countries. Among various industries, construction sector is identified as the most hazardous work place. Construction accidents not only cause human sufferings but also result in huge financial loss. To prevent reoccurrence of similar accidents in the future and make scientific risk control plans, analysis of accidents is essential. In construction industry, fatality and catastrophe investigation summary reports are available for the past accidents. In this study, text mining and natural language process (NLP) techniques are applied to analyze the construction accident reports. To be more specific, five baseline models, support vector machine (SVM), linear regression (LR), K-nearest neighbor (KNN), decision tree (DT), Naive Bayes (NB) and an ensemble model are proposed to classify the causes of the accidents. Besides, Sequential Quadratic Programming (SQP) algorithm is utilized to optimize weight of each classifier involved in the ensemble model. Experiment results show that the optimized ensemble model outperforms rest models considered in this study in terms of average weighted F1 score. The result also shows that the proposed approach is more robust to cases of low support. Moreover, an unsupervised chunking approach is proposed to extract common objects which cause the accidents based on grammar rules identified in the reports. As harmful objects are one of the major factors leading to construction accidents, identifying such objects is extremely helpful to mitigate potential risks. Certain limitations of the proposed methods are discussed and suggestions and future improvements are provided.

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