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Search Results: 1 - 10 of 744 matches for " Nikola Bene? "
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CoInDiVinE: Parallel Distributed Model Checker for Component-Based Systems
Nikola Bene,Ivana ?erná,Milan K?ivánek
Electronic Proceedings in Theoretical Computer Science , 2011, DOI: 10.4204/eptcs.72.7
Abstract: CoInDiVinE is a tool for parallel distributed model checking of interactions among components in hierarchical component-based systems. The tool extends the DiVinE framework with a new input language (component-interaction automata) and a property specification logic (CI-LTL). As the language differs from the input language of DiVinE, our tool employs a new state space generation algorithm that also supports partial order reduction. Experiments indicate that the tool has good scaling properties when run in parallel setting.
Language Emptiness of Continuous-Time Parametric Timed Automata
Nikola Bene,Peter Bezděk,Kim G. Larsen,Ji?í Srba
Computer Science , 2015,
Abstract: Parametric timed automata extend the standard timed automata with the possibility to use parameters in the clock guards. In general, if the parameters are real-valued, the problem of language emptiness of such automata is undecidable even for various restricted subclasses. We thus focus on the case where parameters are assumed to be integer-valued, while the time still remains continuous. On the one hand, we show that the problem remains undecidable for parametric timed automata with three clocks and one parameter. On the other hand, for the case with arbitrary many clocks where only one of these clocks is compared with (an arbitrary number of) parameters, we show that the parametric language emptiness is decidable. The undecidability result tightens the bounds of a previous result which assumed six parameters, while the decidability result extends the existing approaches that deal with discrete-time semantics only. To the best of our knowledge, this is the first positive result in the case of continuous-time and unbounded integer parameters, except for the rather simple case of single-clock automata.
Bene's Progressive Design Received the Interior Innovation Award 2013 for Its DOCKLANDS Collection Прогрессивный дизайн от Bene удостоен награды. Коллекция DOCKLANDS стала лауреатом премии Interior Innovation Award – 2013
- Bene
Project Baikal , 2013,
Analysing Sanity of Requirements for Avionics Systems (Preliminary Version)
Ji?í Barnat,Petr Bauch,Nikola Bene,Lubo? Brim,Jan Beran,Tomá? Kratochvíla
Computer Science , 2015,
Abstract: In the last decade it became a common practice to formalise software requirements to improve the clarity of users' expectations. In this work we build on the fact that functional requirements can be expressed in temporal logic and we propose new sanity checking techniques that automatically detect flaws and suggest improvements of given requirements. Specifically, we describe and experimentally evaluate approaches to consistency and redundancy checking that identify all inconsistencies and pinpoint their exact source (the smallest inconsistent set). We further report on the experience obtained from employing the consistency and redundancy checking in an industrial environment. To complete the sanity checking we also describe a semi-automatic completeness evaluation that can assess the coverage of user requirements and suggest missing properties the user might have wanted to formulate. The usefulness of our completeness evaluation is demonstrated in a case study of an aeroplane control system.
Hennessy-Milner Logic with Greatest Fixed Points as a Complete Behavioural Specification Theory
Nikola Bene,Beno?t Delahaye,Uli Fahrenberg,Jan K?etínsky,Axel Legay
Computer Science , 2013,
Abstract: There are two fundamentally different approaches to specifying and verifying properties of systems. The logical approach makes use of specifications given as formulae of temporal or modal logics and relies on efficient model checking algorithms; the behavioural approach exploits various equivalence or refinement checking methods, provided the specifications are given in the same formalism as implementations. In this paper we provide translations between the logical formalism of Hennessy-Milner logic with greatest fixed points and the behavioural formalism of disjunctive modal transition systems. We also introduce a new operation of quotient for the above equivalent formalisms, which is adjoint to structural composition and allows synthesis of missing specifications from partial implementations. This is a substantial generalisation of the quotient for deterministic modal transition systems defined in earlier papers.
LTL Model Checking of Parametric Timed Automata
Peter Bezděk,Nikola Bene,Vojtěch Havel,Ji?í Barnat,Ivana ?erná
Computer Science , 2014,
Abstract: The parameter synthesis problem for timed automata is undecidable in general even for very simple reachability properties. In this paper we introduce restrictions on parameter valuations under which the parameter synthesis problem is decidable for LTL properties. The proposed problem could be solved using an explicit enumeration of all possible parameter valuations. However, we introduce a symbolic zone-based method for synthesising bounded integer parameters of parametric timed automata with an LTL specification. Our method extends the ideas of the standard automata-based approach to LTL model checking of timed automata. Our solution employs constrained parametric difference bound matrices and a suitable notion of extrapolation.
Ad Alta : Journal of Interdisciplinary Research , 2012,
Abstract: This thesis is analyzing the modern role of the internal audit in corporate(mainly banking) structures. It describes the changes made in the social role ofauditing during the years and emphasizes the internal audit′s risk managementfunction, rather than just control function. Attention is given to the methodology used,especially to the currently most widespread risk-based auditing approach. Also one ofthe most recent approaches to auditing – so called continuous auditing - is brieflydescribed and the possibilities of its implementation into the risk-based framework areoutlined.
Calculating the Hubble diagram by perturbation theory
Gyula Bene
Physics , 2010,
Abstract: The effect of density fluctuations upon light propagation is calculated perturbatively in a matter dominated irrotational universe. The starting point is the perturbed metric (second order in the perturbation strength), while the output is the Hubble diagram. Density fluctuations cause this diagram to broaden to a strip. Moreover, the shift of the diagram mimics accelerated expansion.
Quantum reference systems: a new framework for quantum mechanics
Gyula Bene
Physics , 1997, DOI: 10.1016/S0378-4371(97)00254-9
Abstract: A new interpretation of nonrelativistic quantum mechanics is presented. It explains the violation of Bell's inequality by maintaining realism and the principle of locality. Schrodinger's cat paradox and the Einstein-Podolsky-Rosen paradox are solved, too. The new approach assumes the universal validity of the Schrodinger equation, while von Neumann's postulates about the measurement process are replaced with a new, consistent set of postulates. The underlying idea is that quantum states depend on quantum reference systems in a fundamental way. Quantum reference systems (a new concept, first introduced in this paper) are themselves physical systems which contain the system to be described.
On the solution of the EPR paradox and the explanation of the violation of Bell's inequality
Gyula Bene
Physics , 1997,
Abstract: A new interpretation offers a consistent conceptual basis for nonrelativistic quantum mechanics. The Einstein-Podolsky-Rosen (EPR) paradox is solved and the violation of Bell's inequality is explained by maintaining realism, inductive inference and Einstein separability.
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