By P. Pandurang Nayak

This booklet is predicated at the author's PhD thesis which used to be chosen in the course of the 1993 ACM Doctoral Dissertation festival as one of many 3 most sensible submissions.

This monograph investigates the matter of choosing sufficient versions for reasoning approximately actual platforms and functions to engineering challenge fixing. a sublime remedy of either the theoretical and useful facets are provided: the matter is exactly formalized, its computational complexity is analyzed intimately, and an effective set of rules for locating sufficient versions is derived; at the useful facet, a strategy for development structures that immediately build sufficient versions is supplied, and implementational elements and exams are described.

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**Extra info for Automated Modeling of Physical Systems**

**Example text**

It can be described by different sets of equations. Different device models differ because they give different answers to the following two fundamental questions: What must be modeled? Different models can differ because they choose to model different physical phenomena. 2 include the heat generated due to current flow in the wire, but not the electromagnetic field generated by the same current flow. , they choose a different set of objects to model. 2 chose a granularity that includes the bimetallic strip as a single object.

E q u a t i o n s . T h e equations that a modet fragment class inherits to its instances are defined using the e q u a t i o n s clause. These equations are defined 28 2. object)))))] Fig. 11. The Two-terminal-electrical-component model fragment class. using equation schemas. Equation schemas are exactly like equations, except that parameters are replaced by terms like ( r e s i s t a n c e ? o b j e c t ) . To instantiate such equation schemas for specific instances of the model fragment class, the variable " ?

11. The Two-terminal-electrical-component model fragment class. using equation schemas. Equation schemas are exactly like equations, except that parameters are replaced by terms like ( r e s i s t a n c e ? o b j e c t ) . To instantiate such equation schemas for specific instances of the model fragment class, the variable " ? o b j e c t " is bound to the instance, and the terms are replaced by the parameter resulting from evaluating the term. For example, if r e s i s t a n c e ( w i r e - l ) = r e s i s t a n c e - p a r a m e t e r - I , then evaluating the term ( r e s i s t a n c e ?