Typical-case complexity and the SAT competitions

Mann, Zoltán Ádám

doi:10.29007/cvj9

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…The main metric that we used for comparing the performance of solvers is the number of problem instances they can solve within a given time limit. This is in line with the methodology used at the SAT competitions [39].…”

Section: Evaluation Methodologysupporting

confidence: 82%

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Guiding SAT Solving by Formula Partitioning

Mann

Papp

2017

Int. J. Artif. Intell. Tools

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When deciding the satisfiability of a Boolean formula, one promising approach is to split the formula into two smaller independent sub-formulas. While many studies report encouraging early results with such methods, the approach is rarely used in state-of-the-art solvers. In this paper, we present a technique that uses formula partitioning to guide the solution of the SAT problem through providing initialization values for the VSIDS heuristic. Our results on a large number of benchmark instances show that the method can notably improve the performance of modern solvers, especially if the time available for solving is short. We also present some findings in the area of hypergraph partitioning, which is used as a tool for our technique.

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Section: Evaluation Methodologysupporting

confidence: 82%

“…Deciding satisfiability is NP-complete. Although modern SAT solvers can sometimes solve extremely large formulas in reasonable time, they may need orders of magnitude more time to solve other, much smaller formulas [39]. Therefore, further research is still needed.…”

Section: Introductionmentioning

confidence: 99%

Guiding SAT Solving by Formula Partitioning

Mann

Papp

2017

Int. J. Artif. Intell. Tools

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“…The rightmost three 's below the diagonal are instances where the SAT solver struggled with the formulas generated by Reuse. We noticed more timeouts using Reuse in these instances, which provides more evidence of the well-known fact that there is no strict connection between the size and the hardness of formulas for satisfiability checking [13].…”

Section: Category 4 (♦)mentioning

confidence: 59%

Improving SAT-based Bounded Model Checking for Existential CTL through Path Reuse

Jiang

Ciardo

EPiC Series in Computing

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A complementary technique to decision-diagram-based model checking is SAT-based bounded model checking (BMC), which reduces the model checking problem to a propositional satisfiability problem so that the corresponding formula is satisfiable iff a counterexample or witness exists. Due to the branching time nature of computation tree logic (CTL), BMC for the universal fragment of CTL (ACTL) considers a counterexample in a bounded model as a set of bounded paths. Since the existential fragment of CTL (ECTL) is dual to ACTL, and ACTL formulas are often negated to obtain ECTL ones in practice, we focus on BMC for ECTL and propose an improved translation that generates a possibly smaller propositional formula by reducing the number of bounded paths to be considered in a witness. Experimental results show that the formulas generated by our approach are often easier for a SAT solver to answer. In addition, we propose a simple modification to the translation so that it is also defined for models with deadlock states.

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BME VIK Annual Research Report on Electrical Engineering and Computer Science 2015

Vajk¹,

Harsányi

Poppe

et al. 2016

Period. Polytech. Elec. Eng. Comp. Sci.

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PrefaceThroughout László Vajta, Dean of BME VIK János Levendovszky, Deputy Dean of BME VIK Department of Automation and Applied InformaticsDepartment of Automation and Applied Informatics (AUT) is one of the largest and dynamically developing departments at BME with diverse scope competences such as control theory, embedded systems, software modelling, applied software development, Internet of Things, power electronics, mechatronics, and many others. The department's main activities are education, research and development. Training versatile electrical and software engineers with solid practical knowledge is our top priority. Our profile also includes developing high quality software and hardware solutions for industry partners. All of our activities are backed by strong research background.In 2015, the department has organized the 21 st European Wireless (EW) Conference. The EW 2015 conference hosted more than 140 participants from 30 different countries. The 2015 edition of EW was aimed at addressing a key theme on "5G and beyond."The next sections summarize the key research results of the department in year 2015. IoT and Smart CityThe Internet of Things (IoT) is transforming the surrounding physical objects into an ecosystem of information that enriches our everyday life. The IoT represents the convergence of advances in miniaturization, wireless connectivity, and increased data storage, and is driven by various sensors. Application and service development methods and frameworks are required to support the realization of solutions covering data collection, transmission, data processing, analysis, reporting, and advanced querying. Our SensorHUB framework URBMOBI is a mobile environmental sensor that (i) provides temporally and spatially distributed environmental data, (ii) fulfills the need for monitoring at various places without the costs for a large number of fixed measurement stations, (iii) integrates small and precise sensors in a system that can be operated on buses, trams, or other vehicles, (iv) concentrates on urban heat and thermal comfort, and (v) aims at providing climate services and integration with real-time climate models.utilizes the state-of-the-art open source technologies and provides a unified tool chain for IoT related application and ser-URBMOBI project has been worked out between 2013 and 2015 by the following consortium: RWTH Aachen University (Germany), Netherlands Organization for Applied Scientific Research TNO (Netherlands), ARIA Technologies (France), Budapest University of Technology and Economics (Hungary), and Meteorological and Environmental Earth Observation (Italy).The SOLSUN (Sustainable Outdoor Lighting & Sensory Urban Networks) project is about to demonstrate how intelligent city infrastructure can be created in a cost-effective and sustainable way by reusing existing street lighting as the communications backbone. We apply different technologies and methods to reduce energy consumption at the same time as turning streetlights into nodes on a scalable network that is al...

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Typical-case complexity and the SAT competitions

Cited by 3 publications

References 22 publications

Guiding SAT Solving by Formula Partitioning

Guiding SAT Solving by Formula Partitioning

Improving SAT-based Bounded Model Checking for Existential CTL through Path Reuse

BME VIK Annual Research Report on Electrical Engineering and Computer Science 2015

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