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Author : Johann Deneux
Publisher :
ISBN 13 : 9789155465742
Total Pages : 29 pages
Book Rating : 4.4/5 (657 download)
Download or read book Verification of Parameterized and Timed Systems written by Johann Deneux and published by . This book was released on 2006 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hoang Gia Nguyen
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (114 download)
Download or read book Efficient Parametric Verification of Parametric Timed Automata written by Hoang Gia Nguyen and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Critical real-time systems are becoming ubiquitous and are playing a vital role in our world. To provide guarantees that the system is behaving correctly, the correctness of these systems need to be verified before running. Besides functional checking, the timed behavior checking is also crucial. Indeed, the correctness of the systems also depends on the timing values or delays of internal operations that can be affected by the environment. Verification techniques assure that software or hardware systems fully satisfy all their expected requirements. Most formal verification methods for timed systems guarantee the correctness of a timed system for the predefined timing values in its blueprint, but not for other undefined timing values which might occur by the environment change and lead to undesired system behaviors. Unfortunately, verifying such system for various timing values can be an obstacle and time-consuming. Therefore, by abstracting these specific timing values with parameters, many timing values of a system can be easily synthesized and checked at the same time : this technique is also known as parameter synthesis. As a huge challenge for the verification, parameter synthesis techniques also suffer from the “state space explosion” problem, which is the explosion of the number of possible states while verifying a system formally. Firstofall, we are interested in taking advantage of the capabilities of current distributed architectures, and parameter synthesis algorithms should be redefined and adapted to the distributed case. We propose in the thesis several distribution schemes that can accelerate our parameter synthesis procedures. We also focus on studying the techniques such as symbolic verification, zone subsumption, etc. and how they affect the state space explosion problem. Then we introduce several smart state exploration techniques with some heuristics, in order to reduce the state space explosion. These techniques and heuristics are integrated into our new synthesis algorithms, and one of these algorithms is also extended in a distributed manner which gives an impressive performance in our benchmarks. Furthermore, to achieve a reliable result we present an approach for detecting timed systems doing an infinite amount of actions in a finite time, which is known as the Zeno phenomenon in theory. In reality, it is infeasible and such counterexamples should always be avoided. Additionally, to detect the non-Zeno phenomenon on a large scale network model, we also distribute our approach on clusters. In the end, we introduce an algorithm to detect non-Zeno runs and its distributed version of it for large-scale models. At the time of writing this thesis, this is also the first work on non-Zeno parameter synthesis.
Author : Etienne André
Publisher : John Wiley & Sons
ISBN 13 : 1118569784
Total Pages : 170 pages
Book Rating : 4.1/5 (185 download)
Download or read book The Inverse Method written by Etienne André and published by John Wiley & Sons. This book was released on 2013-02-20 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces state-of-the-art verification techniques for real-time embedded systems, based on the inverse method for parametric timed automata. It reviews popular formalisms for the specification and verification of timed concurrent systems and, in particular, timed automata as well as several extensions such as timed automata equipped with stopwatches, linear hybrid automata and affine hybrid automata. The inverse method is introduced, and its benefits for guaranteeing robustness in real-time systems are shown. Then, it is shown how an iteration of the inverse method can solve the good parameters problem for parametric timed automata by computing a behavioral cartography of the system. Different extensions are proposed particularly for hybrid systems and applications to scheduling problems using timed automata with stopwatches. Various examples, both from the literature and industry, illustrate the techniques throughout the book. Various parametric verifications are performed, in particular of abstractions of a memory circuit sold by the chipset manufacturer ST-Microelectronics, as well as of the prospective flight control system of the next generation of spacecraft designed by ASTRIUM Space Transportation. Contents: 1. Parametric Timed Automata. 2. The Inverse Method for Parametric Timed Automata. 3. The Inverse Method in Practice: Application to Case Studies. 4. Behavioral Cartography of Timed Automata. 5. Parameter Synthesis for Hybrid Automata. 6. Application to the Robustness Analysis of Scheduling Problems. 7. Conclusion and Perspectives. About the Authors Étienne André is Associate Professor in the Laboratoire d’Informatique de Paris Nord, in the University of Paris 13 (Sorbonne Paris Cité) in France. His current research interests focus on the verification of real-time systems. Romain Soulat is currently completing his PhD at the LSV laboratory at ENS-Cachan in France, focusing on the modeling and verification of hybrid temporal systems.
Author : Tobias Isenberg
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Induction-based Verification of Timed Systems written by Tobias Isenberg and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer controlled systems are a foundation to today's society. Correctness of the functionality provided by these systems is of importance, since they are often deployed in safety-critical scenarios. Many of these systems include timed behavior. In order to ensure the quality of these systems, model-based design approaches can be employed where the systems under development are designed using models. The absence of erroneous behavior in these models can be ensured with formal methods. In this work, we use the modeling formalism of networks of timed automata. We approach two deficiencies of analysis techniques for these models. First, they easily run out of memory when exploring large, complex models. Second, they do not handle changes of the models efficiently. We provide a technique for the verification of safety properties specifying the absence of erroneous behavior for networks of timed automata. Our technique deliberately works distinct from other approaches in this field, as it employs induction and avoids explicit exploration and storage of states. In consequence, it is a valuable complement to existing technologies. Furthermore, in the presence of reconfigurations (i.e., changes) we reuse inductive invariants computed by our algorithm. This idea works well for a special class of systems, denoted Parameterized Timed Systems, where the number of timed automata is given as parameter. Our technique enables a verification of the entire system, irrespective of the actual number of automata. To this end, we verify the safety property for the smaller models of the family and reuse the computed inductive invariants to reason about the larger models. In addition, we examine the reusability of the inductive invariant for general models and reconfigurations. ; eng
Author : Thomas Göthel
Publisher : Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN 13 : 9783838134604
Total Pages : 240 pages
Book Rating : 4.1/5 (346 download)
Download or read book Mechanical Verification of Parameterized Real-Time Systems written by Thomas Göthel and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2012-08 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real-time systems, such as real-time operating systems, often have to be able to cope with an unbounded number of similar components. These systems fall in the class of parameterized systems. Especially in safety-critical areas, formal verification ensures that they behave correctly in all cases. However, the machine-assisted verification of parameterized real-time systems is hard because automatic verification techniques (such as model checking) can be employed directly only for finite instances of a system and are thus incomplete. To overcome this problem, we provide a framework for the mechanical, comprehensive, and semi-automatic verification of parameterized real-time systems. At its core, we employ the process calculus Timed CSP. We provide an interactive theorem proving environment enhanced with debugging capabilities using automatic verification techniques. Thus, finite instances can be checked and debugged with automatic tool support. Then, given the evidence that the overall parameterized real-time system behaves correctly, our theorem proving environment facilitates its semi-automatic, comprehensive verification.
Author : Vladislavs Jahundovics
Publisher : Linköping University Electronic Press
ISBN 13 : 9176859185
Total Pages : 155 pages
Book Rating : 4.1/5 (768 download)
Download or read book Automatic Verification of Parameterized Systems by Over-Approximation written by Vladislavs Jahundovics and published by Linköping University Electronic Press. This book was released on 2015-11-17 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a completely automatic verification framework to check safety properties of parameterized systems. A parameterized system is a family of finite state systems where every system consists of a finite number of processes running in parallel the same algorithm. All the systems in the family differ only in the number of the processes and, in general, the number of systems in a family may be unbounded. Examples of parameterized systems are communication protocols, mutual exclusion protocols, cache coherence protocols, distributed algorithms etc. Model-checking of finite state systems is a well-developed formal verification approach of proving properties of systems in an automatic way. However, it cannot be applied directly to parameterized systems because the unbounded number of systems in a family means an infinite state space. In this thesis we propose to abstract an original family of systems consisting of an unbounded number of processes into one consisting of a fixed number of processes. An abstracted system is considered to consist of k+1 components—k reference processes and their environment. The transition relation for the abstracted system is an over-approximation of the transition relation for the original system, therefore, a set of reachable states of the abstracted system is an over-approximation of the set of reachable states of the original one. A safety property is considered to be parameterized by a fixed number of processes whose relationship is in the center of attention in the property. Such processes serve as reference processes in the abstraction. We propose an encoding which allows to perform reachability analysis for an abstraction parameterized by the reference processes. We have successfully verified three classic parameterized systems with replicated processes by applying this method.
Author : Paul Pettersson
Publisher : Springer
ISBN 13 : 3540316167
Total Pages : 313 pages
Book Rating : 4.5/5 (43 download)
Download or read book Formal Modeling and Analysis of Timed Systems written by Paul Pettersson and published by Springer. This book was released on 2005-11-29 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-proceedings of the Third International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2005, held in Uppsala, Sweden in September 2005 in conjunction with ARTIST2 summer school on Component Modelling, Testing and Verification, and Static analysis of embedded systems. The 19 revised full papers presented together with the abstracts of 3 invited talks were carefully selected from 43 submissions. The papers cover work on semantics and modeling of timed systems, formalisms for modeling and verification including timed automata, hybrid automata, and timed petri nets, games for verification and synthesis, model-checking, case studies and issues related to implementation, security and performance analysis.
Author :
Publisher :
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.:/5 (31 download)
Download or read book Parameter Estimation Techniques and Applications in Aircraft Flight Testing written by and published by . This book was released on 1974 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. Dzhaparidze
Publisher : Springer Science & Business Media
ISBN 13 : 1461248426
Total Pages : 331 pages
Book Rating : 4.4/5 (612 download)
Download or read book Parameter Estimation and Hypothesis Testing in Spectral Analysis of Stationary Time Series written by K. Dzhaparidze and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: . . ) (under the assumption that the spectral density exists). For this reason, a vast amount of periodical and monographic literature is devoted to the nonparametric statistical problem of estimating the function tJ( T) and especially that of leA) (see, for example, the books [4,21,22,26,56,77,137,139,140,]). However, the empirical value t;; of the spectral density I obtained by applying a certain statistical procedure to the observed values of the variables Xl' . . . , X , usually depends in n a complicated manner on the cyclic frequency). . This fact often presents difficulties in applying the obtained estimate t;; of the function I to the solution of specific problems rela ted to the process X . Theref ore, in practice, the t obtained values of the estimator t;; (or an estimator of the covariance function tJ~( T» are almost always "smoothed," i. e. , are approximated by values of a certain sufficiently simple function 1 = 1
Author : Mathias Ramparison
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (124 download)
Download or read book On the Theory and Practice of Updatable Parametric Timed Automata written by Mathias Ramparison and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As cyber-physical systems become more and more complex, human debugging is not sufficient anymore to cover the huge range of possible behaviours. For costly critical systems where human lives can be endangered, formally proving the safety of a systemis even more crucial. This is done by defining a formal specification for the system, and then performing the algorithmic verification that the system satisfies some formally specified properties. With this precise and exhaustive description of a system, the usual vagueness of human language is eliminated. In this thesis, we focus on the verification of timed concurrent systems. Time-dependent systems are very hard toverify, especially when the exact value of timing constants remains unknown. Theseunknown timing constants are called parameters. We study several subclasses of aparametric extension of the well-known formalism called Timed Automata. We mainly focus on the reachability decision problem, that asks whether there exists concrete values for these parameters such that a bug state can be reached in the system. We further address for these subclasses a computation problem that is to synthesise the set of parameter values for which a state is reachable. Finally, we apply our work to the security and safety of cyber-physical systems and infrastructure : we extend with parameters a classic formalism to model attack and failure scenarios called attack-fault trees, and propose an implementation of the translation of parametric attack-fault trees to parametric timed automata. This allows us to leverage the verification techniques and tools available for the latter for the analysis of (parametric) attack-fault trees.
Author : Catalin Dima
Publisher : Springer Nature
ISBN 13 : 3030850374
Total Pages : 165 pages
Book Rating : 4.0/5 (38 download)
Download or read book Formal Modeling and Analysis of Timed Systems written by Catalin Dima and published by Springer Nature. This book was released on 2021-08-16 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 19th International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2021, held in Paris, France, in August 2021. The 8 full papers that were carefully reviewed and selected from 19 submissions are presented in this volume with 2 invited talks. The papers focus on topics such as probabilistic computation, logic and verification, robotic planning, complexity of timed pattern matching, safety violations in real-time systems, modal and temporal logics, and others.
Author : M. Amouroux
Publisher : Elsevier
ISBN 13 : 1483298817
Total Pages : 533 pages
Book Rating : 4.4/5 (832 download)
Download or read book Control of Distributed Parameter Systems 1989 written by M. Amouroux and published by Elsevier. This book was released on 2014-06-28 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents state-of-the-art reports on the theory, and current and future applications of control of distributed parameter systems. The papers cover the progress not only in traditional methodology and pure research in control theory, but also the rapid growth of its importance for different applications. This title will be of interest to researchers working in the areas of mathematics, automatic control, computer science and engineering.
Author : Farn Wang
Publisher : Springer Science & Business Media
ISBN 13 : 3540236104
Total Pages : 517 pages
Book Rating : 4.5/5 (42 download)
Download or read book Automated Technology for Verification and Analysis written by Farn Wang and published by Springer Science & Business Media. This book was released on 2004-10-19 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Second International Conference on Automated Technology for Verificaton and Analysis, ATVA 2004, held in Taipei, Taiwan in October/November 2004. The 24 revised full papers presented together with abstracts of 6 invited presentations and 7 special track papers were carefully reviewed and selected from 69 submissions. Among the topics addressed are model-checking theory, theorem-proving theory, state-space reduction techniques, languages in automated verification, parametric analysis, optimization, formal performance analysis, real-time systems, embedded systems, infinite-state systems, Petri nets, UML, synthesis, and tools.
Author : G. A. Bekey
Publisher : Elsevier
ISBN 13 : 1483165787
Total Pages : 869 pages
Book Rating : 4.4/5 (831 download)
Download or read book Identification and System Parameter Estimation 1982 written by G. A. Bekey and published by Elsevier. This book was released on 2016-06-06 with total page 869 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identification and System Parameter Estimation 1982 covers the proceedings of the Sixth International Federation of Automatic Control (IFAC) Symposium. The book also serves as a tribute to Dr. Naum S. Rajbman. The text covers issues concerning identification and estimation, such as increasing interrelationships between identification/estimation and other aspects of system theory, including control theory, signal processing, experimental design, numerical mathematics, pattern recognition, and information theory. The book also provides coverage regarding the application and problems faced by several engineering and scientific fields that use identification and estimation, such as biological systems, traffic control, geophysics, aeronautics, robotics, economics, and power systems. Researchers from all scientific fields will find this book a great reference material, since it presents topics that concern various disciplines.
Author : Edmund M. Clarke
Publisher : Springer
ISBN 13 : 3319105752
Total Pages : 1210 pages
Book Rating : 4.3/5 (191 download)
Download or read book Handbook of Model Checking written by Edmund M. Clarke and published by Springer. This book was released on 2018-05-18 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model checking is a computer-assisted method for the analysis of dynamical systems that can be modeled by state-transition systems. Drawing from research traditions in mathematical logic, programming languages, hardware design, and theoretical computer science, model checking is now widely used for the verification of hardware and software in industry. The editors and authors of this handbook are among the world's leading researchers in this domain, and the 32 contributed chapters present a thorough view of the origin, theory, and application of model checking. In particular, the editors classify the advances in this domain and the chapters of the handbook in terms of two recurrent themes that have driven much of the research agenda: the algorithmic challenge, that is, designing model-checking algorithms that scale to real-life problems; and the modeling challenge, that is, extending the formalism beyond Kripke structures and temporal logic. The book will be valuable for researchers and graduate students engaged with the development of formal methods and verification tools.
Author : Dimitrios M. Thilikos
Publisher : Springer
ISBN 13 : 3642332935
Total Pages : 283 pages
Book Rating : 4.6/5 (423 download)
Download or read book Parameterized and Exact Computation written by Dimitrios M. Thilikos and published by Springer. This book was released on 2012-08-30 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 7th International Symposium on Parameterized and Exact Computation, IPEC 2012, in Ljubljana, Slovenia, in September 2012. The 21 revised full papers presented together with 2 keynote talks were carefully reviewed and selected from 37 submissions. The topics addressed cover research in all aspects of parameterized/exact algorithms and complexity including but are not limited to new techniques for the design and analysis of parameterized and exact algorithms; fixed-parameter tractability results; parameterized complexity theory; relationship between parameterized complexity and traditional complexity classifications; applications of parameterized and exact computation; and implementation issues of parameterized and exact algorithms.
Author : Michael Hintermüller
Publisher : Springer Nature
ISBN 13 : 3030793931
Total Pages : 518 pages
Book Rating : 4.0/5 (37 download)
Download or read book Non-Smooth and Complementarity-Based Distributed Parameter Systems written by Michael Hintermüller and published by Springer Nature. This book was released on 2022-02-18 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of the most challenging problems in the applied sciences involve non-differentiable structures as well as partial differential operators, thus leading to non-smooth distributed parameter systems. This edited volume aims to establish a theoretical and numerical foundation and develop new algorithmic paradigms for the treatment of non-smooth phenomena and associated parameter influences. Other goals include the realization and further advancement of these concepts in the context of robust and hierarchical optimization, partial differential games, and nonlinear partial differential complementarity problems, as well as their validation in the context of complex applications. Areas for which applications are considered include optimal control of multiphase fluids and of superconductors, image processing, thermoforming, and the formation of rivers and networks. Chapters are written by leading researchers and present results obtained in the first funding phase of the DFG Special Priority Program on Nonsmooth and Complementarity Based Distributed Parameter Systems: Simulation and Hierarchical Optimization that ran from 2016 to 2019.
