Model Compilation An Approach to Automated Model Derivation

An approach is introduced to automated model derivation for knowledge based systems. The approach, model compilation, involves procedurally generating the set of domain models used by a knowledge based system. With an implemented example, how this approach can be used to derive models of different precision and abstraction is illustrated, and models are tailored to different tasks, from a given set of base domain models. In particular, two implemented model compilers are described, each of which takes as input a base model that describes the structure and behavior of a simple electromechanical device, the Reaction Wheel Assembly of NASA's Hubble Space Telescope. The compilers transform this relatively general base model into simple task specific models for troubleshooting and redesign, respectively, by applying a sequence of model transformations. Each transformation in this sequence produces an increasingly more specialized model. The compilation approach lessens the burden of updating and maintaining consistency among models by enabling their automatic regeneration. Keller, Richard M. and Baudin, Catherine and Iwasaki, Yumi and Nayak, Pandurang and Tanaka, Kazuo Ames Research Center NASA-TM-107895, FIA-90-04-06-01, NAS 1.15:107895 NAS2-11555; NAS2-12952...