The next generations of Geometrical Product Specification (GPS) standards are considered to be too\ud theoretical, abstract, complex and over-elaborate. And it is not easier for industry to understand and\ud implement them efficiently in a short time. An intelligent knowledge-based system, “VirtualSurf” is\ud being developed to solve the problem, particularly for surface texture knowledge, which is a critical\ud part of GPS. This system will provide expert knowledge of surface texture to link surface function,\ud specification of micro- and nano-geometry through manufacture, and verification. The intelligent\ud knowledge-base should be capable of incorporating knowledge from multiple sources (standards,\ud books, experts, etc), adding new knowledge from these sources and still remain a coherent reliable\ud system. A new data model – category model, based on category theory will be adopted to construct\ud this system
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