摘要:

Abstract:Intrinsically vague knowledge is typical of the decision processes involved in medical diagnosis, especially when they are based on complex and non numeric data. Linguistic descriptions of the symptoms exhibited by a given patient do not, by definition, represent a precise numeric concept and diagnostic classes cannot be modelled in terms of crisp sets. Fuzzy set theory and fuzzy logic provide an appropriate framework for the representation of imprecise medical concepts and imprecise modes of reasoning. A medical expert system with a fuzzy inference model, for the diagnosis of involutional osteoporosis is presented. Medical knowledge is represented in the form of relationships between combinations of symptoms and diagnostic classes. Two categories of disease, postmenopausal osteoporosis and senile osteoporosis are identified and three diagnostic classes are introduced for each disease category expressing the degree of severity of the disease: Definite, Possible, Excluded. For each diagnostic class the system infers a conclusion expressing the degree of satisfaction in the choice of the diagnostic class.

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00220.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Abstract:The sophisticated nature of new production facilities means more complex maintenance units and costly breakdowns. For users of high tech machinery, the efficiency of their maintenance services is becoming an increasingly important factor, and for manufacturers, the maintainability of their equipment they sell is an element that has to be taken into account in their battle for market share. Troubleshooting Expert Systems (TES) are one possible means of improving maintenance capability and maintenance units. Surveying cases of success or failure that the authors have witnessed themselves or come across in the literature, they propose a checklist of seven questions to be considered at the outset of TES development, which deal with the human, managerial and organisational aspects of TES.

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00221.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Abstract:On the basis of experience gained in the engineering industry, the present paper describes advantages and drawbacks encountered using the expert system technique. The constraints which real programs are subject to are explained using a configuration system as an example. The criteria which influence the choice of software and hardware are presented. Finally, aspects of the knowledge elicitation task as well as implementation topics are discussed.

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00222.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Abstract:Techniques for acquiring and representing strategic knowledge for guiding diagnostic processes are presented. In a diagnostic expert system, strategic knowledge can be represented either by a specific knowledge base or it can be ‘embedded’ into the inference engine. We decided for the former; so that knowledge can be acquired or modified without affecting the problem solving paradigm. Strategic knowledge is acquired by expert interview in a straightforward way: on the basis of simple information provided by the expert, an internal sophisticated representation is automatically generated. The techniques are not restricted to a particular problem‐solving paradigm or application. However, in order to prove the effectiveness of our approach, a problem solving paradigm is also presented. The paradigms adopted in diagnosis must face two problems: the selection of the ‘right’ hypothesis (fault) to pursue and the selection of the ‘right’ observation (measurement) to be executed. We present some criteria for selecting hypotheses and observations. Our proposal is suitable for domains where the measurements to localise the fault do not always provide certainty but only a ‘degree of belief’ about the presence of the fault. As a consequence, the problem of selecting the right measurement is solved by appropriate criteria and heuristic reasoning. Moreover, we do not consider ‘right’ as a predefined concept: actually, it is based on the information provided by the expert. So he can define this concept on the basi

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00223.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00224.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00225.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Expert Systems has invited Julian Clinton, Product Development Manager at Integral Solutions, to describe the background to the company's recent launch of POPLOG‐Neural. POPLOG‐Neural runs on all POPLOG host systems. These include Sun 3, SPARC station, Sun 386i, DEC VAX under both VMS and Ultrix, DECstation, Hewlett‐Packard 9000/300 systems, Sequent Symmetry and 68000‐based Apollo workstations. You do not need an existing POPLOG licence to use POPLOG‐Neural. For further information contact either Julian Clinton or Colin Shearer at Integral Solutions Ltd, Unit 3, Campbell Court, Bramley, Basingstoke RG26 5EG, UK (tel: +44 (0)256 882028). POPLOG is a trademark of the University of Sussex. Other trademarks ack

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00226.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00227.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Book reviewd in this article:Deduction Systems in Artificial Intelligence,Karl Hans Bläsius and Hans‐Jürgen Bürckert (Eds.)Prolog Programming,Nigel Ford.Perspectives in Artificial Intelligence, Volume I: Expert Systems: Applications and Technical Foundations,J. A. Campbell, J. Cuena (

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00228.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-4720    

DOI:10.1111/j.1468-0394.1990.tb00229.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY