The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 1993
Filed:
Jul. 05, 1990
Naoki Katoh, Hachioji, JP;
Masato Mogaki, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
According to the present invention, in a knowledge based system having rules each constructed of 'IF condition clause, THEN action clause', a working memory for storing a data group describing an inference object to which a rule is applied, and an inference engine, in selecting one instantiation from a conflict set, a rule for each instantiation is executed in accordance with the action clause of the rule, the execution results are evaluated by using an evaluation knowledge, and the evaluation results are compared to select the instantiation having a higher evaluation value. The data changed by the rule execution process for an instantiation aborted after the evaluation is recovered to the original state. The invention is applicable to the placement method of elements and interconnections within a semiconductor integrated circuit.