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前文主要介绍了一般CAD系统。但是新开发的CAD系统,几乎都带有不同程度的人工智能(Artificiel Intelligence,AI)特征。人工智能是从五十年代开始出现的一门新兴学科,至今已经历了两个不同的发展阶段。在七十年代初以前,人们致力于基础理论的研究,诸如问题的求解,知识的表达及信息的感知等方面,并提出了不少较抽象的原理,如启发式搜索,问题剖析法,推理机理,语义网络和过程知识等。自七十年代到现在,人们更注重工程应用的研究,其中已取得成效的有机器入学,定理证明,数据库智能检索,组合调度及专家系统等。因此,专家系统实际上是人工智能应用领域中
Preface mainly introduces the general CAD system. However, newly developed CAD systems have almost all Artificially Intelligence (AI) features. Artificial intelligence is a new discipline emerging from the 1950s. It has gone through two different stages of development. Before the early 1970s, people devoted themselves to the study of basic theories such as solving problems, expressing knowledge and perceiving information, and put forward many more abstract principles such as heuristic search, problem analysis, reasoning Mechanism, semantic network and process knowledge. Since the 1970s, people pay more attention to the research of engineering application. Among them, there are machine enrollments, theorem proving, database intelligent retrieval, combination scheduling and expert system that have achieved success. Therefore, expert systems are actually artificial intelligence applications