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Featured researches published by Judith Barlow.


Health Care Analysis | 1994

Operations research survey and computer simulation of waiting times in two medical outpatient clinic structures.

Richard H. T. Edwards; John E Clague; Judith Barlow; Margaret Clarke; Patrick G. Reed; Roy Rada

Outpatient services are increasingly recognised as an important component of health care provision and may be improved through the application of modern management techniques. We have performed a time and role audit of consultation and waiting times in two medical clinics using different queuing systems: namely, a serial processing clinic where patients wait in a single queue and a quasi-parallel processing clinic where patients are directed to the shortest queue to maintain clinic flow. Data collected were used to construct a computer simulation of patient flows in clinic. Assessment of patient satisfaction in the clinic process was determined using a self-administered questionnaire. Mean waiting time was shorter in the quasi-parallel processing clinic: 26 (SD 17) minutes compared with 36(24) minutes in the serial processing clinic. In the serial processing clinic 61% of patients waited more than 30 minutes compared with 41% in the quasi-parallel processing clinic. In the serial processing clinic 8% of 142 patients surveyed complained of the time spent waiting. The computer simulation we produced was able to determine waiting times with different clinic structures. The simulation showed that reductions in waiting time up to 30% might be achieved by changing our serial processing clinic to a quasi-parallel processing one. Performance of medical outpatient clinics can be improved by examining and changing clinic management. Computer simulation of outpatient clinics offers a means of assessing the impact of such changes on waiting time in clinic and on waiting lists.


Expert Systems With Applications | 1990

EXPERTEXT: from semantic nets to logic petri nets

Roy Rada; Paul E. Dunne; Judith Barlow

Abstract Hypertext systems present textual information in an intuitive way, while expert systems logically solve problems. Expertext is an approach to combining the precision of expert reasoning processes with the browsing capabilities afforded by hypertext. In this paper intelligent hypertext is first modeled with a semantic net. The semantic net formalism is then extended to a Petri net formalism. Finally, a deductive inferencing ability is added to the Petri net formalism. Examples of how an Electronic Yellow Pages might exploit these methods are presented.


International journal on policy and information | 1990

A Multicriteria Stratification Framework for Uncertainty and Risk Analysis

Judith Barlow; Fred Glover

We present a new decision framework for handling uncertainty and risk based on stratifying uncertainty in a model whose structure parallels that of multicriteria optimization. The approach incorporates multiple risk perspective without homogenizing them into one representative function. Rather than requiring a priori omniscience about how factors will interact, it generates progressively amended decision templates based on model outcomes.


Artificial Intelligence in Medicine | 1990

Expertext for medical care and literature retrieval

Roy Rada; Judith Barlow; Pieter E. Zanstra; Pieter F. de Vries Robbé; Djujan Bijstra; Jan Potharst

An expert system has been extended to a kind of expertext system and can be used to structure a query to a medical literature system and retrieve document citations. The expert system is built on the ROIS expert system shell, and the literature retrieval is from the Excerpta Medica document database EMBASE. The domain knowledge in ROIS is structured in a rich but small semantic net, while EMBASE has a massive, hierarchical, semantic net backbone. Queries that reason with the patient record and a medical semantic net so as to produce Boolean queries for literature retrieval have been implemented. The terms of these queries are then mapped into the semantic net of EMBASE. Finally, another reasoning strategy ranks documents to the query.


Health Informatics Journal | 1995

Modelling and simulating the management of medical outpatient clinics

Patrick G. Reed; Roy Rada; Judith Barlow; John E Clague; Rhiannon Tudor Edwards

Previous efforts to model health care clinics point to the value of careful observation of clinics, the derivation of performance criteria and the use of object-oriented models. A computer program, called Medical Outpatient Clinic Simulator, has been developed which simulates the running of medical outpatient clinics in terms of waiting times in clinics for medical staff and patients. The steps of observing clinics, determining their performance criteria, and modelling and simulating them are described in this paper. The modelling highlights the roles undertaken and procedures performed by staff in an object-oriented fashion. Patients may flow through the clinic in either serial or quasi-parallel fashion. The Medical Outpatients Clinic Simulator has been used by management as a tool for testing the effects of changes in running a clinic, and demonstrates the soundness of the modelling and simulation methodology.


Interacting with Computers | 1989

Interacting with computers

Judith Barlow; Roy Rada; Dan Diaper

Abstract In contrast with the claims of Bench-Capon and McEnery (1989), this paper argues that users of computer systems will find it more profitable to model the computer system than to model its programmers. However, Bench-Capon and McEnerys views about the limitations of natural language for interacting with computers are supported.


International Journal of Health Care Quality Assurance | 1997

Improving outpatient clinic efficiency using computer simulation

John E Clague; Patrick G. Reed; Judith Barlow; Roy Rada; Margaret Clarke; Richard H. T. Edwards


Journal of Documentation | 1991

Document ranking using an enriched thesaurus

Roy Rada; Judith Barlow; Jan Potharst; Pieter E. Zanstra; Djujan Bijstra


Knowledge Engineering Review | 1988

Expert systems and hypertext

Roy Rada; Judith Barlow


Information and decision technologies | 1990

Hierarchical semantic nets support retrieving and generating hypertext

Roy Rada; Mahmoud Mhashi; Judith Barlow

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Roy Rada

University of Maryland

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Dan Diaper

Bournemouth University

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