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Positive and negative length-bound reachability constraints 27

Positive and negative length-bound reachability constraints

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27th international conference on principles and practice of constraint programming, CP 2021

作者： Quesada, Luis Brown, Kenneth N. Insight Centre for Data Analytics School of Computer Science University College Cork Ireland

ISBN: (纸本)9783959772112

In many application problems, including physical security and wildlife conservation, infrastructure must be configured to ensure or deny paths between specified locations. We model the problem as sub-graph design subject to constraints on paths and path lengths, and propose length-bound reachability constraints. Although reachability in graphs has been modelled before in constraint programming, the interaction of positive and negative reachability has not been studied in depth. We prove that deciding whether a set of positive and negative reachability constraints are satisfiable is NP complete. We show the effectiveness of our approach on decision problems, and also on optimisation problems. We compare our approach with existing constraint models, and we demonstrate significant improvements in runtime and solution costs, on a new problem set. © Luis Quesada and Kenneth N. Brown.

关键词： constraint theory

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Neighborhood-based variable ordering heuristics for the constraint satisfaction problem 7

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7th international conference on principles and practice of constraint programming, CP 2001

作者： Bessière, Christian Chmeiss, Assef Saïs, Lakhdar 161 rue Ada Montpellier Cedex 534392 France CRIL - Université d’ Artois IUT de Lens Rue de l’université - SP 16 LENS Cedex62307 France

ISBN: (纸本)3540428631

One of the key factors in the efficiency of backtracking algorithms is the rule they use to decide on which variable to branch next (namely, the variable ordering heuristics). In this paper, we give a formulation of dynamic variable ordering heuristics that takes into account the properties of the neighborhood of the variable. © Springer-Verlag Berlin Heidelberg 2001.

关键词： constraint satisfaction problems

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A constraint-based framework for prototyping distributed virtual applications 6th

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6th international conference on principles and practice of constraint programming, CP2000

作者： Gupta, Vineet Jagadeesan, Lalita Jategaonkar Jagadeesan, Radha Jiang, Xiaowei Läufer, Konstantin 201 Ravendale Mountain ViewCA94043 United States Software Production Research Dept Bell Laboratories Lucent Technologies 263 Shuman Blvd NapervilleIL60566 United States Dept. of Mathematical and Computer Sciences Loyola University Chicago 6525 N. Sheridan Road ChicagoIL60626 United States

ISBN: (纸本)3540410538

this paper describes the architecture and implementation of a constraint-based framework for rapid prototyping of distributed applications such as virtual simulations, collaborations and games. Our framework integrates three components based on (concurrent) constraint programming ideas: (1) Hybrid cc, a (concurrent) constraint modeling language for hybrid systems, (2) Sisl, a (discrete) timed constraint language for describing interactive services with flexible user interfaces and (3) Triveni, a process-algebraic language for concurrent programming. the framework is realized as a collection of tools implemented in Java. the utility of the ideas are illustrated by sketching the implementations of simple distributed applications. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Modeling languages

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Epistemic Logic Programs: A Study of Some Properties 16th

Epistemic Logic Programs: A Study of Some Properties

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16th international conference on Logic programming and Non-Monotonic Reasoning (LPNMR)

作者： Costantini, Stefania Formisano, Andrea Univ Aquila DISIM Laquila Italy Univ Udine DMIF Udine Italy

ISBN: (纸本)9783031157073;9783031157066

Epistemic Logic Programs (ELPs), extend Answer Set programming (ASP) with epistemic operators. the semantics of such programs is provided in terms of world views, which are sets of belief sets. Different semantic approaches propose different characterizations of world views. Recent work has introduced semantic properties that should be met by any semantics for ELPs, like the Epistemic Splitting Property, that, if satisfied, allows to modularly compute world views in a bottom-up fashion, analogously to 'traditional' ASP. We analyze the possibility to change the perspective, shifting from a bottom-up to a top-down approach to splitting. Our new definition: (i) copes with concerns regarding unfoundedness of world views and subjective constraint monotonicity;(ii) is provably applicable to many of the existing semantics;(iii) operates similarly to "traditional" ASP;(iv) provably coincides with the bottom-up notion of splitting at least on the class of Epistemically Stratified Programs (which are, intuitively, those where the use of epistemic operators is stratified).

关键词： Answer Set programming Epistemic Logic Programs Epistemic Splitting

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A constraint programming approach to the stable marriage problem 1

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7th international conference on principles and practice of constraint programming, CP 2001

作者： Gent, Ian P Irving, Robert W Manlove, David F Prosser, Patrick Smith, Barbara M School of Computer Science University of St. Andrews United Kingdom Department of Computing Science University of Glasgow United Kingdom School of Computing and Mathematics University of Huddersfield United Kingdom

ISBN: (数字)9783540455783

ISBN: (纸本)3540428631

the Stable Marriage problem (SM) is an extensively-studied combinatorial problem with many practical applications. In this paper we present two encodings of an instance I of SM as an instance J of a constraint Satisfaction Problem. We prove that, in a precise sense, establishing arc consistency in J is equivalent to the action of the established Extended Gale/Shapley algorithm for SM on I. As a consequence of this, the man-optimal and woman-optimal stable matchings can be derived immediately. Furthermore we show that, in both encodings, all solutions of I may be enumerated in a failure-free manner. Our results indicate the applicability of constraint programming to the domain of stable matching problems in general, many of which are NP-hard. © Springer-Verlag Berlin Heidelberg 2001.

关键词： constraint satisfaction problems

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principles and practice of constraint programming – CP 2004 1

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丛书名： Lecture Notes in Computer Science

1000年

作者： Mark Wallace

ISBN: (数字)9783540302018

ISBN: (纸本)9783540232414

the 10th international conference on the principles and practice of constraint programming (CP 2003) was held in Toronto, Canada, during September 27 – October 1, 2004. Information about the conference can be found on the Web at http://***/~cp2004/ constraint programming (CP) is about problem modelling, problem solving, programming, optimization, software engineering, databases, visualization, user interfaces, and anything to do with satisfying complex constraints. It reaches into mathematics, operations research, arti?cial intelligence, algorithms, c- plexity, modelling and programming languages, and many aspects of computer science. Moreover, CP is never far from applications, and its successful use in industry and government goes hand in hand with the success of the CP research community. constraintprogrammingcontinuesto beanexciting,?ourishingandgrowing research?eld,***, from 158 submissions, we chose 46 to be published in full in the proceedings. Instead of selecting one overall best paper, we picked out four “distinguished” papers – though we were tempted to select at least 12 such papers. In addition we included 16 short papersin the proceedings– these were presentedas posters at CP 2004. this volume includes summaries of the four invited talks of CP 2004. Two speakers from industry were invited. However these were no ordinary industrial representatives,buttwoofthe leadingresearchersinthe CPcommunity:Helmut Simonis of Parc Technologies, until its recent takeover by Cisco Systems; and Jean Francoi ¸ s Puget, Director of Optimization Technology at ILOG. the other two invited speakers are also big movers and shakers in the researchcommunity.

关键词： Software Engineering/programming and Operating Systems programming Techniques programming Languages, Compilers, Interpreters Logics and Meanings of Programs Mathematical Logic and Formal Languages Artificial Intelligence

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Computer Science principles: Impacting Student Motivation & Learning Within and Beyond the Classroom 16

Computer Science Principles: Impacting Student Motivation & ...

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12th ACM annual conference on international Computing Education Research (ICER)

作者： Behnke, Kara A. Kos, Brittany Ann Bennett, John K. Univ Colorado ATLAS Inst 1125 18th St320 UCB Boulder CO 80309 USA Univ Denver inWorks 1380 Lawrence StSuite 1400 Denver CO 80204 USA

ISBN: (纸本)9781450344494

the Computer Science (CS) principles framework seeks to broaden student participation and diversity in the field by focusing on the creative and social aspects of computing. As the pilot effort undergoes its early execution phases, this research contributes to the theoretical and practical application of CS principles. We investigated the impact of CS principles on student motivation and learning outcomes and sought to determine if the pedagogy created any lasting change on student perceptions of CS as a field of practice. We report a case study of how CS principles created an effective framework for introducing undergraduate students to the fundamentals of computer science. We discuss how Self-Determination theory instantiates Self-Directed Learning, Constructionist, and Connectivist learning theories, which can be used to inform the pedagogical framework. Quantitative and qualitative measures were used to assess the impact of CS principles on student motivation and learning outcomes, followed by an additional surveying of students one year after the completion of the course. Results indicate that CS principles facilitated positive programming experiences for students, helped increase learning interest and improve attitudes of CS as a field of study, positively changed perceptions of CS as a creative practice, and also encouraged students to continue learning CS after the course had finished. In particular, many non-majority students in the course self-reported to having positive changes and attitudes about CS explicitly because of the course. these finding suggest that CS principles is a step in the right direction for creating more engaging and compelling curricula to diverse groups of students, especially those with minimal experience and exposure in the field. We discuss opportunities for future work using the selected theoretical framework for CS principles.

关键词： Computer Science principles computational thinking self-determination theory self-directed learning constructionism connectivism motivation learning outcomes

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Software Development as an Experiment System: A Qualitative Survey on the State of the practice 16th

Software Development as an Experiment System: A Qualitative ...

引用

16th international conference on Agile Software Development (XP)

作者： Lindgren, Eveliina Munch, Jurgen Univ Helsinki Dept Comp Sci POB 68 FI-00014 Helsinki Finland

ISBN: (纸本)9783319186122;9783319186115

An experiment-driven approach to software product and service development is gaining increasing attention as a way to channel limited resources to the efficient creation of customer value. In this approach, software functionalities are developed incrementally and validated in continuous experiments with stakeholders such as customers and users. the experiments provide factual feedback for guiding subsequent development. Although case studies on experimentation in industry exist, the understanding of the state of the practice and the encountered obstacles is incomplete. this paper presents an interview-based qualitative survey exploring the experimentation experiences of ten software development companies. the study found that although the principles of continuous experimentation resonated with industry practitioners, the state of the practice is not yet mature. In particular, experimentation is rarely systematic and continuous. Key challenges relate to changing organizational culture, accelerating development cycle speed, and measuring customer value and product success.

关键词： Continuous experimentation Experiment-driven software development Customer feedback Qualitative survey

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Computing the Local Aromaticity of Benzenoids thanks to constraint programming 26th

Computing the Local Aromaticity of Benzenoids Thanks to Con...

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26th international conference on principles and practice of constraint programming, CP 2020

作者： Carissan, Yannick Dim, Chisom-Adaobi Hagebaum-Reignier, Denis Prcovic, Nicolas Terrioux, Cyril Varet, Adrien Aix Marseille Univ CNRS Centrale Marseille ISM2 Marseille France Aix Marseille Univ Université de Toulon CNRS LIS Marseille France

ISBN: (纸本)9783030584740

Benzenoids are a subfamily of hydrocarbons (molecules that are only made of hydrogen and carbon atoms) whose carbon atoms form hexagons. these molecules are widely studied in theoretical chemistry. then, there is a lot of problems relative to this subject, like the benzenoid generation or the enumeration of all its Kekulé structures (i.e. all valid configurations of double bonds). In this context, the computation of the local aromaticity of a given benzenoid is an important problematic since the aromaticity cannot be measured. Nowadays, computing aromaticity requires quantum chemistry calculations that are too expensive to be used on medium to large-sized molecules. But, there exist some methods related to graph theory which can allow us to compute it. In this article, we describe how constraint programming can be useful in order to compute the aromaticity of benzenoids. Moreover we show that our method is much faster than the reference one, namely NICS. © 2020, Springer Nature Switzerland AG.

关键词： Molecules

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On Relation Between constraint Propagation and Block-Coordinate Descent in Linear Programs 26th

On Relation Between Constraint Propagation and Block-Coordin...

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26th international conference on principles and practice of constraint programming, CP 2020

作者： Dlask, Tomáš Werner, Tomáš Faculty of Electrical Engineering Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9783030584740

Block-coordinate descent (BCD) is a popular method in large-scale optimization. Unfortunately, its fixed points are not global optima even for convex problems. A succinct characterization of convex problems optimally solvable by BCD is unknown. Focusing on linear programs, we show that BCD fixed points are identical to fixed points of another method, which uses constraint propagation to detect infeasibility of a system of linear inequalities in a primal-dual loop (a special case of this method is the Virtual Arc Consistency algorithm by Cooper et al.). this implies that BCD fixed points are global optima iff a certain propagation rule decides feasibility of a certain class of systems of linear inequalities. © 2020, Springer Nature Switzerland AG.

关键词： Linear programming

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