Leonard Friedman

IJCAI Conference 1985 Conference Paper

Controlling Production Firing: The FCL Language

• Leonard Friedman

While implementing a diagnostic expert system, FAITH, we have developed a new language, FCL, for controlling the f i r i n g of productions. FCL greatly simplifies the task of the user to direct this f i r i n g in a coherent and purposeful way without s a c r i f i c i n g some of the main advantages enjoyed by production systems. One of the interesting features of the language is the use of declarative forms to direct the f i r i n g of proper production sequences in a diagnostic expert system. Declarative forms which represent c i r c u i t diagrams and problem families control goal-directed processes l i k e tracing through c i r c u i t s and searching for symptoms to confirm or deny closely related problems. Because we have the FCL f a c i l i t y at our disposal, we have been able to incorporate a larger than usual number of diagnostic strategies in FAITH, with the assurance that they w i l l be employed under the r i g h t circumstances.

AAAI Conference 1980 Conference Paper

Trouble-Shooting by Plausible Inference

• Leonard Friedman

IJCAI Conference 1969 Conference Paper

Robot Control Strategy

• Leonard Friedman

A b e i i a v i o r a l theory of i n f o r m a t i o n p r o cessing based on e t h o l o g i c a l observations has been t e s t e d e x p e r i m e n t a l l y by programming a robot c o n t r o l system. The r e s u l t ant software has s u c c e s s f u l l y simulated robot o p e r a t i o n . Three basic types of software modules are assumed as elements. These accept i n p u t s t i m u l i and generate d e t a i l e d s t r i n g s of motor response " u n i t s " to a t t a i n design g o a l s . A complex process of i n t e r a c t i o n between the modules permits the c o n s i d e r a t i o n of many a l t e r n a t i v e actions w h i l e focusing a t t e n t i o n on a s e l e c t e d set of i n p u t s i g n a l s . ' The organi z a t i o n is shown to have e s p e c i a l l y f l e x i b l e c h a r a c t e r i s t i c s adapted to robot cont r o l and permits a r e c u r s i v e d e f i n i t i o n of 3ome of the modules. B r i e f comparisons w i t h other robot systems in being i n d i c a t e some of the r e l a t i o n s h i p s between the d i f f e r e n t design approaches so f a r proposed.