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Dougherty, Mark
Publications (8 of 8) Show all publications
Aghanavesi, S., Fleyeh, H., Memedi, M. & Dougherty, M. (2019). Feasibility of using smartphones for quantification of Parkinson’s disease motor states during hand rotation tests. In: : . Paper presented at 41st International Engineering in Medicine and Biology Conference, Berlin, Germany, July 23–27, 2019.
Open this publication in new window or tab >>Feasibility of using smartphones for quantification of Parkinson’s disease motor states during hand rotation tests
2019 (English)Conference paper, Published paper (Refereed)
National Category
Medical Engineering
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-29543 (URN)
Conference
41st International Engineering in Medicine and Biology Conference, Berlin, Germany, July 23–27, 2019
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-06-05Bibliographically approved
Jomaa, D., Yella, S. & Dougherty, M. (2017). A comparative study between vehicle activated signs and speed indicator devices. Paper presented at 19th EURO Working Group on Transportation Meeting, EWGT2016, 5-7 September 2016, Istanbul, Turkey. Transportation Research Procedia, 22, 115-123
Open this publication in new window or tab >>A comparative study between vehicle activated signs and speed indicator devices
2017 (English)In: Transportation Research Procedia, ISSN 2324-9935, E-ISSN 2352-1465, Vol. 22, p. 115-123Article in journal (Refereed) Published
Abstract [en]

Vehicle activated signs and Speed indicator devices are safety signs used to warn and remind drivers that they are exceeding the speed limit on a particular road segment. This article has analysed and compared such signs with the aim of reporting the most suitable sign for relevant situations. Vehicle speeds were recorded at different test sites and the effects of the signs were studied by analyzing the mean and standard deviation. Preliminary results from the work indicate that both types of signs have variable effects on the mean and standard deviation of speed on a given road segment. Speed indicator devices were relatively more effective than vehicle activated signs on local roads; in contrast their effectivity was only comparable when tested on highways.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
vehicle activated signs; speed indicator devices; trigger speed; effect on drivers
National Category
Computer and Information Sciences
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-21502 (URN)10.1016/j.trpro.2017.03.017 (DOI)000404633300012 ()2-s2.0-85019409576 (Scopus ID)
Conference
19th EURO Working Group on Transportation Meeting, EWGT2016, 5-7 September 2016, Istanbul, Turkey
Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2018-01-10Bibliographically approved
Dougherty, M. (2017). Something old, something new, something borrowed, something blue: Part 3 - An elephant never forgets. Journal of Intelligent Systems, 26(3), 433-437
Open this publication in new window or tab >>Something old, something new, something borrowed, something blue: Part 3 - An elephant never forgets
2017 (English)In: Journal of Intelligent Systems, ISSN 0334-1860, E-ISSN 2191-026X, Vol. 26, no 3, p. 433-437Article in journal (Refereed) Published
Abstract [en]

Forgetting is an oft-forgotten art. Many artificial intelligence (AI) systems deliver good performance when first implemented; however, as the contextual environment changes, they become out of date and their performance degrades. Learning new knowledge is part of the solution, but forgetting outdated facts and information is a vital part of the process of renewal. However, forgetting proves to be a surprisingly difficult concept to either understand or implement. Much of AI is based on analogies with natural systems, and although all of us have plenty of experiences with having forgotten something, as yet we have only an incomplete picture of how this process occurs in the brain. A recent judgment by the European Court concerns the "right to be forgotten" by web index services such as Google. This has made debate and research into the concept of forgetting very urgent. Given the rapid growth in requests for pages to be forgotten, it is clear that the process will have to be automated and that intelligent systems of forgetting are required in order to meet this challenge.

Keywords
Adaptive memory, forgetting
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-25648 (URN)10.1515/jisys-2014-0148 (DOI)2-s2.0-85023209521 (Scopus ID)
Available from: 2017-07-31 Created: 2017-07-31 Last updated: 2017-11-15Bibliographically approved
Aghanavesi, S., Memedi, M., Dougherty, M., Nyholm, D. & Westin, J. (2017). Verification of a method for measuring Parkinson’s disease related temporal irregularity in spiral drawings. Sensors, 17(10), Article ID 2341.
Open this publication in new window or tab >>Verification of a method for measuring Parkinson’s disease related temporal irregularity in spiral drawings
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2017 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, no 10, article id 2341Article in journal (Refereed) Published
Abstract [en]

Parkinson's disease (PD) is a progressive movement disorder caused by the death of dopamine-producing cells in the midbrain. There is a need for frequent symptom assessment, since the treatment needs to be individualized as the disease progresses. The aim of this paper was to verify and further investigate the clinimetric properties of an entropy-based method for measuring PD-related upper limb temporal irregularities during spiral drawing tasks. More specifically, properties of a temporal irregularity score (TIS) for patients at different stages of PD, and medication time points were investigated. Nineteen PD patients and 22 healthy controls performed repeated spiral drawing tasks on a smartphone. Patients performed the tests before a single levodopa dose and at specific time intervals after the dose was given. Three movement disorder specialists rated videos of the patients based on the unified PD rating scale (UPDRS) and the Dyskinesia scale. Differences in mean TIS between the groups of patients and healthy subjects were assessed. Test-retest reliability of the TIS was measured. The ability of TIS to detect changes from baseline (before medication) to later time points was investigated. Correlations between TIS and clinical rating scores were assessed. The mean TIS was significantly different between healthy subjects and patients in advanced groups (p-value = 0.02). Test-retest reliability of TIS was good with Intra-class Correlation Coefficient of 0.81. When assessing changes in relation to treatment, TIS contained some information to capture changes from Off to On and wearing off effects. However, the correlations between TIS and clinical scores (UPDRS and Dyskinesia) were weak. TIS was able to differentiate spiral drawings drawn by patients in an advanced stage from those drawn by healthy subjects, and TIS had good test-retest reliability. TIS was somewhat responsive to single-dose levodopa treatment. Since TIS is an upper limb high-frequency-based measure, it cannot be detected during clinical assessment.

Keywords
Parkinson's disease; smartphone; spiral tests; temporal irregularity; timing variability; motor assessment; approximate entropy; complexity
National Category
Other Medical Engineering Probability Theory and Statistics
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-29318 (URN)10.3390/s17102341 (DOI)29027941 (PubMedID)2-s2.0-85032855199 (Scopus ID)
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-06-05Bibliographically approved
Yella, S., Nyberg, R. G., Gupta, N. K. & Dougherty, M. (2015). Reliability of manual assessments in determining the types of vegetation on railway tracks. In: Wang, J., Cellary, W., Wang, D., Wang, H., Chen, S.-C., Li, T., Zhang, Y. (Ed.), Web Information Systems Engineering – WISE 2015: 16th International Conference, Miami, FL, USA, November 1-3, 2015, Proceedings, Part II. Paper presented at Web Information Systems Engineering – WISE 2015, 16th International Conference, Miami, FL, USA, November 1-3, 2015 (pp. 391-399). Springer, 9149
Open this publication in new window or tab >>Reliability of manual assessments in determining the types of vegetation on railway tracks
2015 (English)In: 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, Published 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).

Place, publisher, year, edition, pages
Springer, 2015
Series
Lecture Notes in Computer Science; Information Systems and Applications, incl. Internet/Web, and HCI, ISSN 0302-9743 ; 9419
Keywords
Measurements, Reliability, Monitoring, Railway, Vegetation, Maintenance, Human raters, Visual estimates
National Category
Computer and Information Sciences Probability Theory and Statistics
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-20540 (URN)10.1007/978-3-319-26187-4_37 (DOI)978-3-319-26187-4 (ISBN)978-3-319-26186-7 (ISBN)
Conference
Web Information Systems Engineering – WISE 2015, 16th International Conference, Miami, FL, USA, November 1-3, 2015
Available from: 2015-12-27 Created: 2015-12-27 Last updated: 2018-01-10Bibliographically approved
Elf, M. & Dougherty, M. (2003). The role for simulation in the design of new health care environments. In: The 8th International Congress in Nursing Informatics - NI2003: . Paper presented at The 8th International Congress in Nursing Informatics - NI2003, Rio de Janeiro, Brazil, 2003. Rio de Janeiro, Brazil
Open this publication in new window or tab >>The role for simulation in the design of new health care environments
2003 (English)In: The 8th International Congress in Nursing Informatics - NI2003, Rio de Janeiro, Brazil, 2003Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Rio de Janeiro, Brazil: , 2003
National Category
Health Sciences Architectural Engineering
Identifiers
urn:nbn:se:du-148 (URN)
Conference
The 8th International Congress in Nursing Informatics - NI2003, Rio de Janeiro, Brazil, 2003
Available from: 2004-08-10 Created: 2004-08-10 Last updated: 2016-12-29Bibliographically approved
Grek, Å., Hartwig, F. & Dougherty, M.Auxiliary variables for nonresponse adjustment in business surveys.
Open this publication in new window or tab >>Auxiliary variables for nonresponse adjustment in business surveys
(English)Manuscript (preprint) (Other academic)
National Category
Business Administration
Research subject
Complex Systems – Microdata Analysis
Identifiers
urn:nbn:se:du-28521 (URN)
Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-10-26Bibliographically approved
Grek, Å., Hartwig, F. & Dougherty, M.Determinants of debt leverage ratios in Swedish listed companies.
Open this publication in new window or tab >>Determinants of debt leverage ratios in Swedish listed companies
(English)Manuscript (preprint) (Other academic)
National Category
Business Administration
Research subject
Complex Systems – Microdata Analysis, General Microdata Analysis - retail
Identifiers
urn:nbn:se:du-28523 (URN)
Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-10-26Bibliographically approved
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