学术讲座：A Formal Model of Fuzzy Ontology and Its Application in Recommender Systems
报告人：Professor Ho-fung Leung （Chairman of the Department of Computer Science and Engineering at The Chinese University of Hong Kong）
时 间：2012-5-16周三下午2:00
地 点：九龙湖经管楼B-201会议室
主持人：张玉林 (管理科学与工程系) ， 刘新旺(管理科学与工程系)，
摘要： Ontology is becoming increasingly important as a means of knowledge representation and organization to facilitate information exchange, particularly in the context of the Semantic Web. Currently, most of the existing ontology models can only specify concepts as crisp sets. However, many concepts are without clear boundaries or are vague in meanings. In addition, with respect to a certain category, certain objects can be considered as more typical. Based on the Prototype Theory of concepts in psychology, we propose a formal model for fuzzy ontologies. This model is equipped with likeliness, the extent to which an object is considered as an instance of a concept, and typicality, the representativeness of an object in a concept. This model attempts to enable ontologies to model concepts and bring the results of reasoning closer to human thinking. In the second part of the seminar, we describe TYCO, a typicality based collaborative filtering approach for building recommender systems, which has shown superiority in cases where data are sparse.
Biography
Professor Ho-fung Leung is a Professor and the Chairman of the Department of Computer Science and Engineering at The Chinese University of Hong Kong. His research interests cover various aspects centring around artificial intelligence and the web, including ontologies, intelligent agents, self-organising systems, complex systems, social computing, service-oriented architectures, and cloud computing. Professor Leung has authored about 200 papers, including 3 research monographs. Professor Leung was the chairperson of ACM (Hong Kong Chapter) in 1998. He is a Chartered Fellow of the BCS, a Senior Member of both the ACM and the IEEE, and a full member the HKCS. Professor Leung received his BSc and MPhil degrees in Computer Science from The Chinese University of Hong Kong, and his PhD degree and DIC (Diploma of Imperial College) in Computing from Imperial College London.
