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

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 an incredible position in components resembling database concept, synthetic intelligence and software program engineering. in spite of the fact that, there are nonetheless many not easy learn concerns to be addressed and the united kingdom department of the organization for common sense Programming used to be arrange to supply a discussion board the place the flourishing learn group may well speak about very important problems with common sense Programming that have been usually by-passed on the huge overseas meetings. This quantity comprises the twelve papers that have been offered on the ALPUK's third convention which used to be held in Edinburgh, 10-12 April 1991. the purpose of the convention was once to offer a wide yet distinct technical perception into the paintings presently being performed during this box, either within the united kingdom and through researchers as a long way afield as Canada and Bulgaria. The breadth of curiosity during this zone of desktop technological know-how is mirrored within the variety of the papers which conceal - among different parts - vastly parallel implementation, constraint good judgment programming, circuit modelling, algebraic evidence of software homes, deductive databases, specialized editors and standardisation. The ensuing quantity provides a superb review of the present growth 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 suggestions 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

Xn) . Xn) . - A : B. - notA : C. Here, notA is a predicate which fails whenever A succeeds and vice versa. The ':' may be thought of as a parallel version of Prolog's cut. It is mandatory in all clauses in concurrent logic languages, causing all computations to commit to a particular clause, though implicit in clauses where no goals precede it. The calculation of A and notA can proceed in parallel. Given a clause of the form P :- A : E, F. computation of E and F may not start until computation of A has terminated, but may then proceed in parallel.

G. the geometric figure example), opposed to the goal-driven Prolog inference - aimed at solving problems by decomposing them into sub-problems. However it is important to note that since NCL is an extension of Logic Programming it allows both inference schemes to be used in a uniform environment. 2: Logical semantics of the spreading activation The data-driven inference on Hom clauses uses a restricted subset of NCL. e. the corresponding net-clause should have at most one spreading activation node.

A solution of this problem in Prolog is described in [Markov 89, Markov & Risse 88]. 20). 60). 20). 60)] An important feature of this representation is the possibility to define a class of figures, using variables instead of fixed values standing for the vertex names and attributes. L1). L2). L1). L2)] Using variables as edge attributes ensures that the class representation is free of any specific geometric properties as size, orientation, etc. Using this representation the problem of polyhedron recognition comes to the problem of graph isomorphism.

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