By Prof. Dr. José Encarnação, Dr. Ernest G. Schlechtendahl (auth.)
4 lation and optimization. those are crucial materials of the iterative strategy, resulting in a possible and, one hopes, optimum layout. 1.3 content material of the publication In bankruptcy 2 we current in short the background of CAD. the most elements of CAD structures are pointed out, and their significant services defined. Economi cal and interdisciplinary features are mentioned. bankruptcy three begins with a platforms research of the layout method. The proposal of a strategy is brought as a basic software to explain actions like layout as an entire, computer-aided layout, application executions, terminal periods and so forth. the surroundings and the assets which the surroundings needs to offer for the winning execution of any strategy are mentioned. the matter of modelling the layout items in an summary schema and the interrelation among the schema and the making plans of the person step within the layout are analysed. bankruptcy four concentrates at the interfaces one of the parts of a CAD process, together with the human operator. the matter of mapping an summary schema onto the services of assorted programming, command, or info de scription languages is defined intimately. Emphasis is laid upon the source point and its effect at the layout of CAD structures. the idea that of a CAD software program desktop is brought, and principles for designing such machines are given.
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Additional info for Computer Aided Design: Fundamentals and System Architectures
Benest: A Review of Computer Graphics Publications. Computers & Graphics 4 (1979), pp. 95-136. H. Chasen: Historical Highlights of Interactive Computer Graphics. Mechanical Engineering 103 (1981) 11, pp. 32-41.  W. Pease: An Automatic Machine Tool. Scientific American 187 (1952) 3, pp. 101-115.  S. Brown, C. Drayton, B. Mittman: A Description of the APT-Language. CACM 6 (1963) 11, pp. 649--658.  S. Coons: An Outline of the Requirements for a Computer-Aided Design System. AFIPS, SJCC 23 (1963), pp.
We quote Hofstadter  in order to illustrate what we mean by this term: " ... " With the separation we have now introduced between the set of applicable rules and the set of known rules, we can easily express what is meant by changes in the knowledge (which we call "learning" in accordance with ) and by specification: - Learning: add new rules to the set of known rules; - Specification: specify the rules which have to be applied in any given case. 44 3 The Process Aspect of CAD We have seen that the whole design process can indeed be formulated in terms of rules.
1 is not yet the product itself. It is a model of the product which allows us to talk about the product before it exists. Using Nijssens approach , such a model may be deduced from the real world by a sequence of two operations: perception and selection (see Fig . 2). We perceive only a subset of reality: the perceptible reality. The subjectivity 38 3 The Process Aspect of CAD design process Fig. 1. A crude model of the design process perception selection universe of discourse Fig. 2. 1 Modelling of the Design Process 39 We can talk about perceptible reality by assigning names to its entities and the attributes of the entities.