Paper:
Language: English:

Hybrid Module of the IACVIRTUAL Project

Lourdes M. Brasil^, Jean C. C. Rojas^, Fernando M. de Azevedo^, and Carlos W. D. de Almeida^****

^Master's Program in Knowledge and Information Technology Management/Biomedical Engineering Course, Catholic University of Brasília, Campus II, SGAN 916, Módulo B, Sala A 206 Asa Norte, Brasília DF 70790-160, Brazil
^Computer Science Course, Catholic University of Brasília, Campus II, SGAN 916, Módulo B, Sala A 206, Asa Norte, Brasília DF 70790-160, Brazil
^Biomedical Engineering Institute, Federal University of Santa Catarina, Trindade, Florianópolis, SC 88040-900, Brazil
^****Technology Center, Department of Electronics and Systems, Federal University of Pernambuco, DES/CTG-UFPE, Rua Acadêmico Hélio Ramos s/n, sala 416, Cidade Universitária, Recife, PE 50740-530, Brazil

Received: June 25, 2005

Accepted: October 19, 2005

Keywords: hybrid expert system, neural networks, knowledge acquisition, cardiology

Journal ref: Journal of Advanced Computational Intelligence and Intelligent Informatics, Vol.10, No.4 pp. 472-476, 2006

Abstract

This work represents the hybrid module of the IACVIRTUAL meta-environment. In this context we will basically approach the Hybrid Expert System (HES), which is composed by the Neural Networks Based Expert System (NNES) and by the Rule-Based Expert System (RBES). The HES is destined to support the decision of a clinical-surgical team, in the area of cardiology, in the definition of a therapeutic conduct in patients with coronary heart disease. The implementation process starts with the Knowledge Acquisition (KA), which comes from the analysis of a series of clinical parameters, which are used as input data for the NNES. This way, knowledge acquired during elicitation is converted in fuzzy rules. Through these rules, elicitated knowledge is mapped in AND/OR graphs, which then represent the starting structure of the NNES. Learning and optimization of the RBES are made through the Genetic-Backpropagation Based Learning Algorithm (GENBACK). This algorithm can, during the learning process, modify the weight of the connections, as well as the network structure. Knowledge abstracted from the RBES, being already refined, as well as trained and tested, is used to form the Knowledge Base of the RBES.

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