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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. | |
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| Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | ||
| Series Volume | 4416 | Series Issue | Edition | ||
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| 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. |
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| ISSN | 978-1-4244-2735-2 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ MarMelSalTroAlvCle08 | Serial |
93 | ||
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| Author | Chierichetti, Flavio; Lattanzi, Silvio; Mari, Federico; Panconesi, Alessandro | ||||
| Title | On Placing Skips Optimally in Expectation | Type | Conference Article | ||
| Year | 2008 | Publication | Web Search and Web Data Mining (WSDM 2008) | Abbreviated Journal | |
| Volume | Issue | Pages | 15-24 | ||
| Keywords | Information Retrieval | ||||
| Abstract | We study the problem of optimal skip placement in an inverted list. Assuming the query distribution to be known in advance, we formally prove that an optimal skip placement can be computed quite efficiently. Our best algorithm runs in time O(n log n), n being the length of the list. The placement is optimal in the sense that it minimizes the expected time to process a query. Our theoretical results are matched by experiments with a real corpus, showing that substantial savings can be obtained with respect to the tra- ditional skip placement strategy, that of placing consecutive skips, each spanning sqrt(n) many locations. | ||||
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| Publisher | Acm | Place of Publication | Editor | Najork, M.; Broder, A.Z.; Chakrabarti, S. | |
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ ChiLatMar08 | Serial |
94 | ||
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| Author | Alimguzhin, Vadim; Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | Automatic Control Software Synthesis for Quantized Discrete Time Hybrid Systems | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of the 51th IEEE Conference on Decision and Control, CDC 2012, December 10-13, 2012, Maui, HI, USA | Abbreviated Journal | |
| Volume | Issue | Pages | 6120-6125 | ||
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| Publisher | IEEE | Place of Publication | Editor | ||
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| ISSN | ISBN | 978-1-4673-2065-8 | Medium | ||
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| Notes | Techreport version can be found at http://arxiv.org/abs/1207.4098 | Approved | yes | ||
| Call Number | Sapienza @ mari @ cdc12 | Serial |
96 | ||
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| Author | Alimguzhin, Vadim; Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | On Model Based Synthesis of Embedded Control Software | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of the 12th International Conference on Embedded Software, EMSOFT 2012, part of the Eighth Embedded Systems Week, ESWeek 2012, Tampere, Finland, October 7-12, 2012 | Abbreviated Journal | |
| Volume | Issue | Pages | 227-236 | ||
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| Publisher | ACM | Place of Publication | Editor | Ahmed Jerraya and Luca P. Carloni and Florence Maraninchi and John Regehr | |
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| ISSN | ISBN | 978-1-4503-1425-1 | Medium | ||
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| Notes | Techreport version can be found at arxiv.org | Approved | yes | ||
| Call Number | Sapienza @ mari @ emsoft12 | Serial |
97 | ||
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| Author | Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | Linear Constraints as a Modeling Language for Discrete Time Hybrid Systems | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of ICSEA 2012, The Seventh International Conference on Software Engineering Advances | Abbreviated Journal | |
| Volume | Issue | Pages | 664-671 | ||
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| Publisher | ThinkMind | Place of Publication | Editor | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ icsea12 | Serial |
98 | ||
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| Author | Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | Undecidability of Quantized State Feedback Control for Discrete Time Linear Hybrid Systems | Type | Book Chapter | ||
| Year | 2012 | Publication | Theoretical Aspects of Computing – ICTAC 2012 | Abbreviated Journal | |
| Volume | Issue | Pages | 243-258 | ||
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| Publisher | Springer Berlin Heidelberg | Place of Publication | Editor | Roychoudhury, A.; D'Souza, M. | |
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| Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | ||
| Series Volume | 7521 | Series Issue | Edition | ||
| ISSN | ISBN | 978-3-642-32942-5 | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Mari2012 | Serial |
99 | ||
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| Author | Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | Control Software Visualization | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of INFOCOMP 2012, The Second International Conference on Advanced Communications and Computation | Abbreviated Journal | |
| Volume | Issue | Pages | 15-20 | ||
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| Publisher | ThinkMind | Place of Publication | Editor | ||
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| ISSN | 978-1-61208-226-4 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ infocomp2012 | Serial |
100 | ||
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| Author | Alimguzhin, Vadim; Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | A Map-Reduce Parallel Approach to Automatic Synthesis of Control Software | Type | Report | ||
| Year | 2012 | Publication | Abbreviated Journal | ||
| Volume | abs/1210.2276 | Issue | Pages | ||
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| Abstract | Many Control Systems are indeed Software Based Control Systems, i.e. control systems whose controller consists of control software running on a microcontroller device. This motivates investigation on Formal Model Based Design approaches for automatic synthesis of control software.
Available algorithms and tools (e.g., QKS) may require weeks or even months of computation to synthesize control software for large-size systems. This motivates search for parallel algorithms for control software synthesis. In this paper, we present a map-reduce style parallel algorithm for control software synthesis when the controlled system (plant) is modeled as discrete time linear hybrid system. Furthermore we present an MPI-based implementation PQKS of our algorithm. To the best of our knowledge, this is the first parallel approach for control software synthesis. We experimentally show effectiveness of PQKS on two classical control synthesis problems: the inverted pendulum and the multi-input buck DC/DC converter. Experiments show that PQKS efficiency is above 65%. As an example, PQKS requires about 16 hours to complete the synthesis of control software for the pendulum on a cluster with 60 processors, instead of the 25 days needed by the sequential algorithm in QKS. |
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| Publisher | CoRR, Technical Report | Place of Publication | Editor | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ | Serial |
101 | ||
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| Author | Alimguzhin, Vadim; Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico | ||||
| Title | On Model Based Synthesis of Embedded Control Software | Type | Report | ||
| Year | 2012 | Publication | Abbreviated Journal | ||
| Volume | abs/1207.4474 | Issue | Pages | ||
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| Abstract | Many Embedded Systems are indeed Software Based Control Systems (SBCSs), that is control systems whose controller consists of control software running on a microcontroller device. This motivates investigation on Formal Model Based Design approaches for control software. Given the formal model of a plant as a Discrete Time Linear Hybrid System and the implementation specifications (that is, number of bits in the Analog-to-Digital (AD) conversion) correct-by-construction control software can be automatically generated from System Level Formal Specifications of the closed loop system (that is, safety and liveness requirements), by computing a suitable finite abstraction of the plant.
With respect to given implementation specifications, the automatically generated code implements a time optimal control strategy (in terms of set-up time), has a Worst Case Execution Time linear in the number of AD bits $b$, but unfortunately, its size grows exponentially with respect to $b$. In many embedded systems, there are severe restrictions on the computational resources (such as memory or computational power) available to microcontroller devices. This paper addresses model based synthesis of control software by trading system level non-functional requirements (such us optimal set-up time, ripple) with software non-functional requirements (its footprint). Our experimental results show the effectiveness of our approach: for the inverted pendulum benchmark, by using a quantization schema with 12 bits, the size of the small controller is less than 6% of the size of the time optimal one. |
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| Publisher | CoRR, Technical Report | Place of Publication | Editor | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ | Serial |
102 | ||
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