liu.seSearch for publications in DiVA
Change search
Refine search result
1 - 17 of 17
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Chowdhury, Shamsul
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Bodemar, Göran
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Gastroenterology and Hepatology. Östergötlands Läns Landsting, Centre for Medicine, Department of Endocrinology and Gastroenterology UHL.
    Haug, Peter
    Utah University USA.
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Methods for knowledge extraction from clinical database on liver diseases1991In: Computers and biomedical research, ISSN 0010-4809, E-ISSN 1090-2368, Vol. 24, p. 530-548Article in journal (Refereed)
  • 2.
    Chowdhury, Shamsul I.
    Linköping University, Department of Biomedical Engineering, Medical Informatics. Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Computer-based support for knowledge extraction from clinical databases1990Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis is devoted to aspects related to the analysis and interpretation of medical data thus allowing knowledge extraction from medical databases. The difficulties with traditional approaches for data analysis and interpretation by people less proficient in statistics are well known. An attempt has been made to identify different stages in the processes of data analysis and interpretation where this category of users might need help and to identify how this help could best be provided (studies I, II, III). In this work artificial intelligence approaches have been used as remedies to improve user-friendliness as well as power and effectiveness of statistical software in respect to data analysis strategies. Prototype implementations based on these approaches are presented and discussed. Issues pertaining to the evaluation of decision support systems m medicine have been identified and discussed in detail (study IV).

    Knowledge in a knowledge-based system for decision support is generally acquired from experts and the literature. Knowledge can also be effectively extracted from a database of patient observations and from interpretation of those observations. The resulting system would be more accurate in the latter case, especially if it is intended to operate in decision support in the same clinical setting.

    The studies V and VI were conducted to show how retrospectively collected data could be utilized for the purpose of knowledge extraction. More traditional data analysis approaches (study V) were used to analyze a database on liver diseases. The data material used in the study was collected in the HELP system as a routine part of patient care. The main issues involved were detection of outliers and treatment of missing values in order to facilitate utilization of this kind of database for eventual knowledge extraction. In Study V, statistical techniques including discriminant analysis and artificial intelligence approaches such asinductive learning, were used. The 'K nearest neighbor' technique was found to be an easy and acceptable method for estimating missing values when the database contained only a few missing values for each object in the database. Discriminant analysis was found to be a good method for classifying a patient, based on a set of variables, into two or more disease classes. The results show that when discriminant analysis was applied to two groups based on a relatively large number (19) of variables, then only a few (3) of the variables accounted for a high percentage of correct classifications.

    The knowledge-based approach for data analysis and interpretation used in (study III) was applied to a large database (study VI). The main emphasis was to study the feasibility of the approach in exploring a large patient record system. The data material was taken from Kronan Health Center - a primary health care center in suburban Stockholm with a patient database consisting of about 14,000 medical records. The analysis was carried out to test the hypothesis of a possible causation between hypertension and diabetes. The results of this study support the assumption that there is a relationship between diabetes and hypertension but the question of the direction of this relationship remained unsolved, as did the question of direct causality. On the other hand, the results of this study are in accordance with the hypothesis of a common metabolic syndrome. The results arrived at by the analysis method (multivariate tabular analysis) utilized by the system are, moreover in accordance with another statistical method (log linear analysis). This also supports the approach taken in the knowledge-based system.

  • 3.
    Chowdhury, Shamsul I.
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Statistical expert systems: a special application area for knowledge-based computer methodology1987Licentiate thesis, monograph (Other academic)
    Abstract [en]

    The study investigates the purposes, functions and requirements of statistical expert systems and focuses attention on some unique characteristics of this subcategory of knowledge-based systems. Statistical expert systems have been considered in this thesis as one approach to improve statistical software and extend their safe usability to a broad category of users in different phases of a statistical investigation. Some prototype applications in which the author has been involved are presented and discussed. A special chapter is devoted to the question whether this methodology might be a rare example of an advanced technology that is suitable for application in non-advanced environments, such as in developing countries.

  • 4.
    Chowdhury, Shamsul
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Linnarsson, Rolf
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wallgren, Anders
    Dept of Statistics Sween Örebro.
    Wallgren, Britt
    Dept Statistics Sweden Örebro.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Extracting knowledge from a large primary health care database using a knowledge-based statistical approach1990In: Journal of medical systems, ISSN 0148-5598, E-ISSN 1573-689X, Vol. 14, no 4, p. 213-225Article in journal (Refereed)
  • 5.
    Chowdhury, Shamsul
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Mathiesen, Ulrik
    Oskarshamns sjukhus .
    Krusinska, Ewa
    Technical University of Wroclaw, Poland .
    Franzén, Lennart
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Bodemar, Göran
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Gastroenterology and Hepatology. Östergötlands Läns Landsting, Centre for Medicine, Department of Endocrinology and Gastroenterology UHL.
    Design and delivery of information resources and knowledge bases for the diagnosis and managementof liver disorders1994In: ANZIIS-94,1994, Brisbane: IEEE , 1994Conference paper (Refereed)
  • 6.
    Chowdhury, Shamsul
    et al.
    Linköping University, Department of Biomedical Engineering, Medical Informatics. Linköping University, The Institute of Technology.
    Wigertz, Ove
    Linköping University, Department of Biomedical Engineering, Medical Informatics. Linköping University, The Institute of Technology.
    Artificial Intelligence methods in data analysis and interpretation1990In: Knowledge, Data and Computer-assisted Decisions / [ed] Martin Schader, Wolfgang Gaul, Berlin: Springer Verlag , 1990, p. 199-208Chapter in book (Other academic)
  • 7.
    Chowdhury, Shamsul
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Sundgren, Bo
    Stockholm School of Econimics .
    A knowledge-based system for data analysis and interpretation1989In: Methods of Information in Medicine, ISSN 0026-1270, Vol. 28Article in journal (Refereed)
  • 8.
    Kohli, Sunil
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Moidu, Khalid
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Farrier, J
    MEDSIG Sysop Canada.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Åhlfeldt, Hans
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    A study of e-mail use on a health care bulletin board1992In: World Congress On Medical Informatics MEDINFO92,1992, Amsterdam: ElsivierScience Publ , 1992, p. 124-Conference paper (Refereed)
  • 9.
    Krusinska, Ewa
    et al.
    University of Wroclaw .
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Bodemar, Göran
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Gastroenterology and Hepatology. Östergötlands Läns Landsting, Centre for Medicine, Department of Endocrinology and Gastroenterology UHL.
    Integrated approach for designing medical decision support systems with knowledge extracted from clinical databases by statistical methods1991In: SCAMC,1991, MCGRAWHILL, Inc , 1991, p. 353-Conference paper (Refereed)
  • 10.
    Krusinska, Ewa
    et al.
    Dept of Mathemtics and iInformatics Paris.
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Mathiesen, Ulrik
    Oskarshamns hospital .
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Bodemar, Göran
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Gastroenterology and Hepatology. Östergötlands Läns Landsting, Centre for Medicine, Department of Endocrinology and Gastroenterology UHL.
    Franzén, Lennart
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    A statistically rule-based decision support system for the management of patients with suspected liver disease1993In: Vol. 18, no 2, p. 113-130Article in journal (Refereed)
  • 11.
    Krusinska, Ewa
    et al.
    University of Technology Wroclaw, Poland.
    Shahsavar, Nosrat
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Xiao-Ming, Gao
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    A systematic approach to knowledge extraction and representation for medical decision support1993In: Int Open Workshop on Knowledge acquisition, representation and processing,1993, 1993, p. 47-Conference paper (Refereed)
  • 12.
    Krusinska, Ewa
    et al.
    Technical University of Wroclaw Poland.
    Shahsavar, Nosrat
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Xiao-Ming, Gao
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    A systematic approach to knowledge extraction and representation for medical decision support1994In: Foundations of computing and decision sciences, ISSN 0867-6356, Vol. 19, no 1-2, p. 71-88Article in journal (Refereed)
  • 13.
    Mathiesen, Ulrik
    et al.
    Oskarshamn Hospital .
    Krusinska, Ewa
    Technical University of Wroclaw, Poland .
    Bodemar, Göran
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Molecular and Clinical Medicine, Gastroenterology and Hepatology. Östergötlands Läns Landsting, Centre for Medicine, Department of Endocrinology and Gastroenterology UHL.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Babic, Ankica
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Franzén, Lennart
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Frydén, Aril
    Linköping University, Department of Molecular and Clinical Medicine.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Investigation and follow-up of patients with raised levels of liver transaminases. Computerised support for high quality and cost-effetiveness1994In: Medical Informatics in Europe MIE94,1994, 1994, p. 196-Conference paper (Refereed)
  • 14.
    Moidu, Khalid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Singh, Ashok Kumar
    IMT LIU.
    Boström, Karin
    Dept of Obstetrics and Gynaecology University Hospital Linköping.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Trell, Erik
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Department of Health and Society, General Practice.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Towards an essential data set: Applicability in the domain of maternal health services1992In: Methods of Information in Medicine, ISSN 0026-1270, Vol. 31, p. 182-192Article in journal (Refereed)
  • 15.
    Nyänen, P
    et al.
    Technical Research Centre of Finland Tampere.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Wigertz, Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Evaluation of decision support systems in medicine1991In: Computer Methods and Programs in Biomedicine, ISSN 0169-2607, E-ISSN 1872-7565, Vol. 34, p. 229-238Article in journal (Refereed)
  • 16.
    Wigertz, Ove
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Arkad, Kristina
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Magyar, Gabor
    IMT, LiU .
    Xiao-Ming, Gao
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Åhlfeldt, Hans
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Standards for medical knowledge representation1991In: IMIA working conference on Hospital Information Systems,1991, Amsterdam: Elsevier Science Publishers , 1991, p. 175-Conference paper (Refereed)
  • 17.
    Wigertz, Ove
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Chowdhury, Shamsul
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Shahsavar, Nosrat
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Arkad, Kristina
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Xiao-Ming, Gao
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Gill, Hans
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Johansson, Bo
    IMT LiU.
    Validation of medical logics in the Arden syntax knowledge representation1992In: MEDICON92 Mediterrean conference on medical and biological engineering,1992, Pisa: AREADI RICERCA , 1992, p. 1051-Conference paper (Refereed)
1 - 17 of 17
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf