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Author | Mari, Federico; Tronci, Enrico | ||||
Title | CEGAR Based Bounded Model Checking of Discrete Time Hybrid Systems | Type | Conference Article | ||
Year | 2007 | Publication | Hybrid Systems: Computation and Control (HSCC 2007) | Abbreviated Journal | |
Volume | Issue | Pages | 399-412 | ||
Keywords | Model Checking, Abstraction, CEGAR, SAT, Hybrid Systems, DTHS | ||||
Abstract | Many hybrid systems can be conveniently modeled as Piecewise Affine Discrete Time Hybrid Systems PA-DTHS. As well known Bounded Model Checking (BMC) for such systems comes down to solve a Mixed Integer Linear Programming (MILP) feasibility problem. We present a SAT based BMC algorithm for automatic verification of PA-DTHSs. Using Counterexample Guided Abstraction Refinement (CEGAR) our algorithm gradually transforms a PA-DTHS verification problem into larger and larger SAT problems. Our experimental results show that our approach can handle PA-DTHSs that are more then 50 times larger than those that can be handled using a MILP solver. | ||||
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Publisher | Springer | Place of Publication | Editor | Bemporad, A.; Bicchi, A.; Buttazzo, G.C. | |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | ||
Series Volume | 4416 | Series Issue | Edition | ||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Sapienza @ mari @ MarTro07 | Serial | 92 | ||
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Author | Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico; Alvisi, Lorenzo; Clement, Allen; Li, Harry | ||||
Title | Model Checking Nash Equilibria in MAD Distributed Systems | Type | Conference Article | ||
Year | 2008 | Publication | FMCAD '08: Proceedings of the 2008 International Conference on Formal Methods in Computer-Aided Design | Abbreviated Journal | |
Volume | Issue | Pages | 1-8 | ||
Keywords | Model Checking, MAD Distributed System, Nash Equilibrium | ||||
Abstract | We present a symbolic model checking algorithm for verification of Nash equilibria in finite state mechanisms modeling Multiple Administrative Domains (MAD) distributed systems. Given a finite state mechanism, a proposed protocol for each agent and an indifference threshold for rewards, our model checker returns PASS if the proposed protocol is a Nash equilibrium (up to the given indifference threshold) for the given mechanism, FAIL otherwise. We implemented our model checking algorithm inside the NuSMV model checker and present experimental results showing its effectiveness for moderate size mechanisms. For example, we can handle mechanisms which corresponding normal form games would have more than $10^20$ entries. To the best of our knowledge, no model checking algorithm for verification of mechanism Nash equilibria has been previously published. | ||||
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Publisher | IEEE Press | Place of Publication | Piscataway, NJ, USA | Editor | Cimatti, A.; Jones, R. |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 978-1-4244-2735-2 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Sapienza @ mari @ MarMelSalTroAlvCle08 | Serial | 93 | ||
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Author | Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
Title | Linear Constraints and Guarded Predicates as a Modeling Language for Discrete Time Hybrid Systems | Type | Journal Article | ||
Year | 2013 | Publication | International Journal on Advances in Software | Abbreviated Journal | Intern. Journal on Advances in SW |
Volume | vol. 6, nr 1&2 | Issue | Pages | 155-169 | |
Keywords | Model-based software design; Linear predicates; Hybrid systems | ||||
Abstract | Model based design is particularly appealing in
software based control systems (e.g., embedded software) design, since in such a case system level specifications are much easier to define than the control software behavior itself. In turn, model based design of embedded systems requires modeling both continuous subsystems (typically, the plant) as well as discrete subsystems (the controller). This is typically done using hybrid systems. Mixed Integer Linear Programming (MILP) based abstraction techniques have been successfully applied to automatically synthesize correct-by-construction control software for discrete time linear hybrid systems, where plant dynamics is modeled as a linear predicate over state, input, and next state variables. Unfortunately, MILP solvers require such linear predicates to be conjunctions of linear constraints, which is not a natural way of modeling hybrid systems. In this paper we show that, under the hypothesis that each variable ranges over a bounded interval, any linear predicate built upon conjunction and disjunction of linear constraints can be automatically translated into an equivalent conjunctive predicate. Since variable bounds play a key role in this translation, our algorithm includes a procedure to compute all implicit variable bounds of the given linear predicate. Furthermore, we show that a particular form of linear predicates, namely guarded predicates, are a natural and powerful language to succinctly model discrete time linear hybrid systems dynamics. Finally, we experimentally show the feasibility of our approach on an important and challenging case study taken from the literature, namely the multi-input Buck DC-DC Converter. As an example, the guarded predicate that models (with 57 constraints) a 6-inputs Buck DC-DC Converter is translated in a conjunctive predicate (with 102 linear constraints) in about 40 minutes. |
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Publisher | IARIA | Place of Publication | Editor | Luigi Lavazza | |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1942-2628 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | yes | |||
Call Number | Sapienza @ melatti @ | Serial | 115 | ||
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