Download ALPUK 91: Proceedings of the 3rd UK Annual Conference on by Peter Kacsuk (auth.), Geraint A. Wiggins MA, PhD, Chris PDF

By Peter Kacsuk (auth.), Geraint A. Wiggins MA, PhD, Chris Mellish MA, PhD, Tim Duncan BA, MSc (eds.)

Since its notion approximately twenty years in the past, common sense Programming - the assumption of utilizing good judgment as a programming language - has been constructed to the purpose the place it now performs a major position in parts corresponding to database idea, synthetic intelligence and software program engineering. even if, there are nonetheless many not easy study matters to be addressed and the united kingdom department of the organization for good judgment Programming was once manage to supply a discussion board the place the flourishing study neighborhood might speak about very important problems with good judgment Programming which have been usually by-passed on the huge foreign meetings. This quantity comprises the twelve papers that have been awarded on the ALPUK's third convention which was once held in Edinburgh, 10-12 April 1991. the purpose of the convention used to be to offer a vast yet exact technical perception into the paintings at the moment being performed during this box, either within the united kingdom and by means of researchers as some distance afield as Canada and Bulgaria. The breadth of curiosity during this quarter of desktop technological know-how is mirrored within the diversity of the papers which hide - among different parts - vastly parallel implementation, constraint good judgment programming, circuit modelling, algebraic facts of software homes, deductive databases, specialized editors and standardisation. The ensuing quantity provides a great assessment of the present development being made within the box and may be of curiosity to researchers and scholars of any elements of common sense programming, parallel computing or database concepts and management.

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Extra resources for ALPUK 91: Proceedings of the 3rd UK Annual Conference on Logic Programming, Edinburgh, 10–12 April 1991

Sample text

Gregory 87] Gregory, S. Parallel Logic Programming in PARLOG. Addison-Wesley, 1987. [Henderson & Morris 76] Henderson, P. H. Morris. "A lazy evaluator", in Proceedings of the 3rd ACM Symposium on Principles of Programming Languages, 1976, ACM,95-103. [Jorrand 87] Jorrand, Ph. "Design and implementation of a parallel inference machine for first order logic", in: Proc. PARLE Conference. Lecture Notes in Computer Science No. 259, Springer-Verlag, 1987. W. Foundations of Logic Programming. Springer-Verlag, 1984.

E. each net-clause can process only one pattern of data and if we have many of them several copies of the same net-clause are required. g. the Prolog clauses are patterns for data processing). To fill the gap a special kind of net-variable is introduced, called lazy netvariable. It realises the concept of multiple assignment, keeping in the same time the property of logic variable. Two types of lazy net-variables are imple-' mented in NCL. The lazy net-variables of type 1 has three basic features: • The lazy variable is never bound.

The procedure "p" in turn unifies the free node lip", which activates node 11 printing the solutions - the answer substitutions of the goal variables. The lazy unification with decentralised control suits well to the data-driven inference adopted here. The shared variable constraints are applied and new data are generated only when Ilenough" input data are available. In such a way the amount of the output data is reduced to the necessary minimum. Generally the NCL data-driven inference can be viewed as two independent processes: • Local inference of solutions (new data) and propagating them among the net-clauses in the program.

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