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Abstract
This paper describes one of the most important aspects in our recent research on building a HIS-oriented expert system shell: representation and processing of temporal propositions about time-series. With respect to time attribute, medical objects have been classified into three categories: time-independent objects, pointwise time-dependent objects and durationwise time-dependent objects. Temporal propositions can be applied only to time-dependent objects. Through implementation of fuzzy relational operators and their uses, the representation and processing of such propositions become more reasonable and more natural