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Unlike the majority of existing dialogue understanding engines, the presented system automatically encodes semantic representation of a user's query using Bayesian networks. The structure of the networks is determined from annotated dialogue corpora using the Bayesian scoring method, thus eliminating the tedious and costly process of manually coding domain knowledge. The conditional probability distributions are estimated during a training phase using data obtained from the same set of dialogue acts. In order to cope with words absent from our restricted dialogue corpus, a separate offline module was incorporated, which estimates their semantic role from both medical and general raw text corpora, correlating them with known lexical-semantically similar words or predefined topics. Lexical similarity is identified on the basis of both contextual similarity and co-occurrence in conjunctive expressions. The evaluation of the platform was performed against the existing language natural understanding module of DIKTIS, the architecture of which is based on manually embedded domain knowledge.<\/jats:p>","DOI":"10.1142\/s0218213004001570","type":"journal-article","created":{"date-parts":[[2004,7,1]],"date-time":"2004-07-01T11:03:23Z","timestamp":1088679803000},"page":"333-365","source":"Crossref","is-referenced-by-count":0,"title":["DOMAIN KNOWLEDGE ACQUISITION AND PLAN RECOGNITION BY PROBABILISTIC REASONING"],"prefix":"10.1142","volume":"13","author":[{"given":"MANOLIS","family":"MARAGOUDAKIS","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of Patras, 26500 Rion, Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"ARISTOMENIS","family":"THANOPOULOS","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of Patras, 26500 Rion, Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"KYRIAKOS","family":"SGARBAS","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of Patras, 26500 Rion, Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"NIKOS","family":"FAKOTAKIS","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, University of Patras, 26500 Rion, Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2011,11,21]]},"reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1011175525451"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1011174108613"},{"key":"rf5","doi-asserted-by":"crossref","unstructured":"B. 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