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An experimental study of search strategies and heuristics in answer set programming

An experimental study of search strategies and heuristics in...

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3rd international workshop on Answer Set programming: Advances in Theory and Implementation, ASP 2005, Co-located Event with the 19th international Joint Conference on Artificial Intelligence, IJCAI 2005

作者： Giunchiglia, Enrico Maratea, Marco STAR-Lab. DIST University of Genova viale Francesco Causa 13 16145 Genova Italy

Answer Set programming (ASP) and propositional satisfiability (SAT) are closely related. In some recent work we have shown that, on a wide set of logic programs called "tight", the main search procedures used by ASP and SAT systems are equivalent, i.e., that they explore search trees with the same branching nodes. In this paper, we focus on the experimental evaluation of different search strategies, heuristics and their combinations that have been shown to be effective in the SAT community, in ASP systems. Our results show that, despite the strong link between ASP and SAT, it is not always the case that search strategies, heuristics and/or their combinations that currently dominate in SAT are also bound to dominate in ASP. We provide a detailed experimental evaluation for this phenomenon and we shed light on future development of efficient Answer Set solvers.

关键词： logic programming

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A backjumping technique for disjunctive logic programming

A backjumping technique for disjunctive logic programming

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作者： Faber, Wolfgang Leone, Nicola Ricca, Francesco Italy

In this work we present a backjumping technique for Disjunctive logic programming (DLP) under the Answer Set Semantics. It builds upon related techniques that had originally been proposed for propositional satisfiability testing, which have been adapted to non-disjunctive Answer Set programming (ASP) recently [1,2]. We focus on backjumping without clause learning. We provide a new theoretical framework for backjumping on Disjunctive logic Programs. We optimize the reason calculus, reducing the information to be stored, while fully preserving the correctness and the efficiency of the jumping technique. We implement the proposed technique in DLV, the state-of-the-art DLP system. We have conducted several experiments on hard random problems in order to assess the impact of backjumping. Our conclusion is that when lookahead is employed, there is basically no advantage when enabling backjumping. However, when lookahead is disabled, we can observe that the number of choices in general decreases by a non-negligible factor. In our (naive) implementation this gain is (often more than) compensated by the additional overhead incurred by the reason calculus. It is unclear whether one can reduce this overhead by a more efficient implementation. We therefore conjecture that, at least on hard unstructured instances, backjumping only has an impact when lookahead is not active and when clause learning is employed in addition.

关键词： logic programming

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A preliminary report on integrating of answer set and constraint solving

A preliminary report on integrating of answer set and constr...

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作者： Baselice, Sabrina Bonatti, Piero Gelfond, M. Dipartimento di Scienze Fisiche Università Federico II Complesso Universitario di Monte Sant'Angelo Via Cinthia Napoli Italy Texas Tech. University Department of Computer Science Lubbock TX United States

Despite all efforts on intelligent grounding, state-of-the-art answer set solvers still have huge memory requirements, because they compute the ground instantiation of the input program before the actual reasoning starts. This prevents ASP to be effective on several classes of problems. In this paper we integrate answer set generation and constraint solving to reduce the memory requirements for a class of multi-sorted logic programs with cardinality constraints. We prove some theoretical results, introduce a provably sound and complete algorithm, and report experimental results showing that our approach can solve problem instances with significantly larger domains.

关键词： logic programming

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Reducing propositional theories in equilibrium logic to logic programs

Reducing propositional theories in equilibrium logic to logi...

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作者： Cabalar, Pedro Pearce, David Valverde, Agustín Dept. of Computation Univ. of Corunna Spain Dept. of Informatics Statistics and Telematics Univ. Rey Juan Carlos Móstoles Madrid Spain Dept. of Applied Mathematics Univ. of Malaga Spain

The paper studies reductions of propositional theories in equilibrium logic to logic programs under answer set semantics. Specifically we are concerned with the question of how to transform an arbitrary set of propositional formulas into an equivalent logic program and what are the complexity constraints on this process. We want the transformed program to be equivalent in a strong sense so that theory parts can be transformed independent of the wider context in which they might be embedded. It was only recently established [2] that propositional theories are indeed equivalent (in a strong sense) to logic programs. Here this result is extended with the following contributions. (i) We show how to effectively obtain an equivalent program starting from an arbitrary theory. (ii) We show that in general there is no polynomial transformation if we require the resulting program to share precisely the vocabulary or signature of the initial theory. (iii) Extending previous work we show how polynomial transformations can be achieved if one allows the resulting program to contain new atoms. The program obtained is still in a strong sense equivalent to the original theory, and the answer sets of the theory can be retrieved from it.

关键词： Computer circuits

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An integrated architecture for surveillance and monitoring in an archaeological site 3

An integrated architecture for surveillance and monitoring i...

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3rd ACM international workshop on Video Surveillance and Sensor Networks, VSSN 2005

作者： Ardizzone, Edoardo La Cascia, Marco Lo Re, Giuseppe Ortolani, Marco DINFO - University of Palermo Viale delle Scienze ed. 6 Palermo90128 Italy

ISBN: (纸本)1595932429

This paper describes an on-going work aimed at designing and deploying a system for the surveillance and monitoring of an archaeological site, namely the "Valley of the Temples" in Agrigento, Italy. Given the relevance of the site from an artistical and historical point of view, it is important to protect the monuments from malicious or simply incautious behavior;however, the vastity of the area to be monitored and the vague definition of its boundaries make it unpractical to provide extensive coverage through traditional sensors or similar devices. We describe the design of an architecture for the surveillance of the site and for the monitoring of the visitors' behavior consisting in an integrated framework of networked sensors and cameras. Information will be collected by a minimal set of cameras deployed only at critical spots and coupled with higher-performance wireless sensor nodes. Both sets of devices will be supported by more densely deployed lower-cost wireless sensor so that the system will fulfill the concurrent goals of being minimally intrusive and remaining both responsive and efficient. Sensed data will be processed locally whenever possible and convenient, or otherwise sent to a central intelligent unit that will perform further and more sophisticated analyses using a reasoning system, will infer a higher level representation of the outdoor environment, and finally will be able to fine-tune the action of remote devices. © 2005 ACM.

关键词： Dynamic programming

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Secure UML information flow using flow UML

Secure UML information flow using flow UML

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作者： Alghathbar, Khaled Wijesekera, Duminda Farkas, Csilla Dept. of Information and Software Engineering and CSIS George Mason University MS 4A4 Fairfax VA 22030 United States Information Security Laboratory Dept. of Computer Science and Engineering University of South Carolina Columbia SC 29208 United States

ISBN: (纸本)9728865252

FlowUML is a logic-based system to validate information flow policies at the requirements specification phase of UML based designs. It uses Horn clauses to specify information flow polices that can be checked against flow information extracted from UML sequence diagrams. FlowUML policies can be written at a coarse grain level of caller-callee relationships or at a finer level involving passed attributes.

关键词： logic programming

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Multi-level Method Understanding Using Microprints

Multi-level Method Understanding Using Microprints

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IEEE international workshop on Visualizing Software for Understanding and Analysis (VISSOFT)

作者： S. Ducasse M. Lanza R. Robbes LISTIC Université de Savoie France Faculty of Informatics University of Lugano Switzerland

Understanding classes and methods is a key activity in object-oriented programming, since classes represent the primary abstractions from which applications are built, while methods contain the actual program logic. The main problem of this task is to quickly grasp the purpose and inner structure of a class. To achieve this goal, one must be able to overview multiple methods at once. In this paper, we present microprints, pixel-based representations of methods enriched with semantic information. We present three specialized microprints each dealing with a specific aspect we want to understand of methods: (1) state access, (2) control flow, and (3) invocation relationship

关键词： Visualization Informatics Color Object oriented programming logic programming Information analysis Java Printers Switches Delay

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Rule-based topological vulnerability analysis

Rule-based topological vulnerability analysis

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3rd international workshop on Mathematical Methods, Models, and Architectures for Computer Network Security, MMM-ACNS 2005

作者： Swarup, Vipin Jajodia, Sushil Pamula, Joseph MITRE Corporation 7515 Colshire Drive McLean VA 22102 Center for Secure Information Systems George Mason University Fairfax VA 22030-4444

ISBN: (纸本)354029113X

Attack graphs represent known attack sequences that attackers can use to penetrate computer networks. Recently, many researchers have proposed techniques for automatically generating attack graphs for a given computer network. These techniques either use model checkers to generate attack graphs and suffer from scalability problems, or they are based on an assumption of monotonicity and are unable to represent real-world situations. In this paper, we present a vulnerability analysis technique that is more scalable than model-checker-based solutions and more expressive than monotonicity-based solutions. We represent individual attacks as the transition rules of a rule-based system. We define noninterfering rulesets and present efficient, scalable algorithms for those sets. We then consider arbitrary nonmonotonic rulesets and present a series of optimizations which permit us to perform vulnerability assessment efficiently in most practical cases. We motivate the issues and illustrate our techniques using a substantial example. © Springer-Verlag Berlin Heidelberg 2005.

关键词： logic programming

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Modeling and logic control design for production system: a matrix based approach

Modeling and logic control design for production system: a m...

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IEEE international Conference on Industrial Informatics (INDIN)

作者： A. Polic A. Hace K. Jezernik Faculty of Electrical Engineering and Computer science University of Maribor Maribor Slovenia

This paper introduces a novel, more systematic approach to the modeling and control design of machine logic control. The machine logic control is considered to be an event-driven system. A matrix representation of Petri nets is used, for modeling the structure of discrete event-driven system. Its dynamics is described by state-transition equations. The control of discrete event system is introduced by drawing a clear distinction between the plant and the controller model. The proposed approach is illustrated by simulation and experimental results for the lab-scale linear drive position initialization procedure.

关键词： logic design Control design Production systems Programmable control Automatic control Actuators Control systems Petri nets Discrete event systems logic programming

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Cobalt: A Language for Writing Provably-Sound Compiler Optimizations

Cobalt: A Language for Writing Provably-Sound Compiler Optim...

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Proceedings pf the 3rd international workshop on Compiler Optimization Meets Compiler Verification (COCV 2004)

作者： Lerner, Sorin Millstein, Todd Chambers, Craig Department of Computer Science and Engineering University of Washington Seattle WA United States Computer Science Department University of California Los Angeles Los Angeles CA United States

We overview the current status and future directions of the Cobalt project. Cobalt is a domain-specific language for implementing compiler optimizations as guarded rewrite rules. Cobalt optimizations operate over a C-like intermediate representation including unstructured control flow, pointers to local variables and dynamically allocated memory, and recursive procedures. The design of Cobalt engenders a natural inductive strategy for proving the soundness of optimizations. This strategy is fully automated by requiring an automatic theorem prover to discharge a small set of simple proof obligations for each optimization. We have written a variety of forward and backward intraprocedural dataflow optimizations in Cobalt, including constant propagation and folding, branch folding, full and partial redundancy elimination, full and partial dead assignment elimination, and simple forms of points-to analysis. The implementation of our soundness-checking strategy employs the Simplify automatic theorem prover, and we have used this implementation to automatically prove the above optimizations correct. An execution engine for Cobalt optimizations is implemented as part of the Whirlwind compiler infrastructure. © 2005 Elsevier B.V. All rights reserved.

关键词： Computer programming languages

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