Kardio Ivan Bratko, Igor Mozetic, and Nada Lavrac 02273-7, November 1988, 200 pages, $35.00 The MIT Press A successful complex expert system, Kardio's model of the human heart is designed for the diagnosis of cardiac arrhythmias. Kardio is highly skilled in the reading of ECG recordings, and can be used as a diagnostic tool in ECG interpretation. In this grouodbrealdng account, the authors show how the model was compiled, by means of qualitative simulation and machine learning tools, into various representations that are suited for parficnlar expert tasks. They investigate a hierarchical organization of a qualitative model and outline an experiment whereby the construction of a deep model is automated by machine learning techniques. The book contains a complete model of the electrical system of the heart. knowledge are the semantic networks. They were also used in the database field for the semantic data modeling argo development of conceptual schemata. A semantic network is a graph whose nodes represent concepts, classes or sets of entides and the arcs model relationships between theses concepts. Besides the named relationships obtained from the modelling of an application with a semantic network, some special, structural relationships between concepts can occur and have
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