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Author Bobbio, Andrea; Bologna, Sandro; Minichino, Michele; Ciancamerla, Ester; Incalcaterra, Piero; Kropp, Corrado; Tronci, Enrico
Title Advanced techniques for safety analysis applied to the gas turbine control system of Icaro co generative plant Type Conference Article
Year 2001 Publication (down) X Convegno Tecnologie e Sistemi Energetici Complessi Abbreviated Journal
Volume Issue Pages 339-350
Keywords
Abstract The paper describes two complementary and integrable approaches, a probabilistic one and a deterministic one, based on classic and advanced modelling techniques for safety analysis of complex computer based systems. The probabilistic approach is based on classical and innovative probabilistic analysis methods. The deterministic approach is based on formal verification methods. Such approaches are applied to the gas turbine control system of ICARO co generative plant, in operation at ENEA CR Casaccia. The main difference between the two approaches, behind the underlining different theories, is that the probabilistic one addresses the control system by itself, as the set of sensors, processing units and actuators, while the deterministic one also includes the behaviour of the equipment under control which interacts with the control system. The final aim of the research, documented in this paper, is to explore an innovative method which put the probabilistic and deterministic approaches in a strong relation to overcome the drawbacks of their isolated, selective and fragmented use which can lead to inconsistencies in the evaluation results.
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Publisher Place of Publication Genova, Italy Editor
Language Summary Language Original Title
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ISSN ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ tesec01 Serial 65
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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 (down) 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.
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ ChiLatMar08 Serial 94
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Author Pugliese, Rosario; Tronci, Enrico
Title Automatic Verification of a Hydroelectric Power Plant Type Conference Article
Year 1996 Publication (down) Third International Symposium of Formal Methods Europe (FME), Co-Sponsored by IFIP WG 14.3 Abbreviated Journal
Volume Issue Pages 425-444
Keywords
Abstract We analyze the specification of a hydroelectric power plant by ENEL (the Italian Electric Company). Our goal is to show that for the specification of the plant (its control system in particular) some given properties hold. We were provided with an informal specification of the plant. From such informal specification we wrote a formal specification using the CCS/Meije process algebra formalism. We defined properties using μ-calculus. Automatic verification was carried out using model checking. This was done by translating our process algebra definitions (the model) and μ-calculus formulas into BDDs. In this paper we present the informal specification of the plant, its formal specification, some of the properties we verified and experimental results.
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Publisher Springer Place of Publication Oxford, UK Editor Gaudel, M.-C.; Woodcock, J.
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 1051 Series Issue Edition
ISSN 3-540-60973-3 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ fme96 Serial 53
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Author Della Penna, Giuseppe; Intrigila, Benedetto; Melatti, Igor; Tronci, Enrico; Venturini Zilli, Marisa
Title Finite Horizon Analysis of Stochastic Systems with the Mur$\varphi$ Verifier Type Conference Article
Year 2003 Publication (down) Theoretical Computer Science, 8th Italian Conference, ICTCS 2003, Bertinoro, Italy, October 13-15, 2003, Proceedings Abbreviated Journal
Volume Issue Pages 58-71
Keywords
Abstract Many reactive systems are actually Stochastic Processes. Automatic analysis of such systems is usually very difficult thus typically one simplifies the analysis task by using simulation or by working on a simplified model (e.g. a Markov Chain). We present a Finite Horizon Probabilistic Model Checking approach which essentially can handle the same class of stochastic processes of a typical simulator. This yields easy modeling of the system to be analyzed together with formal verification capabilities. Our approach is based on a suitable disk based extension of the Mur$\varphi$ verifier. Moreover we present experimental results showing effectiveness of our approach.
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Publisher Springer Place of Publication Editor Blundo, C.; Laneve, C.
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 2841 Series Issue Edition
ISSN 3-540-20216-1 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ DIMTZ03c Serial 90
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Author Tronci, Enrico
Title Equational Programming in Lambda-Calculus via SL-Systems. Part 1 Type Journal Article
Year 1996 Publication (down) Theoretical Computer Science Abbreviated Journal
Volume 160 Issue 1&2 Pages 145-184
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Notes Approved yes
Call Number Sapienza @ mari @ tcs96 Serial 54
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Author Tronci, Enrico
Title Equational Programming in Lambda-Calculus via SL-Systems. Part 2 Type Journal Article
Year 1996 Publication (down) Theoretical Computer Science Abbreviated Journal
Volume 160 Issue 1&2 Pages 185-216
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Notes Approved yes
Call Number Sapienza @ mari @ tcs96a Serial 55
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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 (down) 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.
Language Summary Language Original Title
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
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Mari2012 Serial 99
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Author Cesta, Amedeo; Finzi, Alberto; Fratini, Simone; Orlandini, Andrea; Tronci, Enrico
Title Validation and verification issues in a timeline-based planning system Type Journal Article
Year 2010 Publication (down) The Knowledge Engineering Review Abbreviated Journal
Volume 25 Issue 03 Pages 299-318
Keywords
Abstract One of the key points to take into account to foster effective introduction of AI planning and scheduling systems in real world is to develop end user trust in the related technologies. Automated planning and scheduling systems often brings solutions to the users which are neither “obvious” nor immediately acceptable for them. This is due to the ability of these tools to take into account quite an amount of temporal and causal constraints and to employ resolution processes often designed to optimize the solution with respect to non trivial evaluation functions. To increase technology trust, the study of tools for verifying and validating plans and schedules produced by AI systems might be instrumental. In general, validation and verification techniques represent a needed complementary technology in developing domain independent architectures for automated problem solving. This paper presents a preliminary report of the issues concerned with the use of two software tools for formal verification of finite state systems to the validation of the solutions produced by MrSPOCK, a recent effort for building a timeline based planning tool in an ESA project.
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Publisher Cambridge University Press Place of Publication Editor
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Notes Approved yes
Call Number Sapienza @ mari @ Cffot10 Serial 18
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Author Tronci, Enrico
Title Hardware Verification, Boolean Logic Programming, Boolean Functional Programming Type Conference Article
Year 1995 Publication (down) Tenth Annual IEEE Symposium on Logic in Computer Science (LICS) Abbreviated Journal
Volume Issue Pages 408-418
Keywords
Abstract One of the main obstacles to automatic verification of finite state systems (FSSs) is state explosion. In this respect automatic verification of an FSS M using model checking and binary decision diagrams (BDDs) has an intrinsic limitation: no automatic global optimization of the verification task is possible until a BDD representation for M is generated. This is because systems and specifications are defined using different languages. To perform global optimization before generating a BDD representation for M we propose to use the same language to define systems and specifications. We show that first order logic on a Boolean domain yields an efficient functional programming language that can be used to represent, specify and automatically verify FSSs, e.g. on a SUN Sparc Station 2 we were able to automatically verify a 64 bit commercial multiplier.
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Publisher IEEE Computer Society Place of Publication San Diego, California Editor
Language Summary Language Original Title
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Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ lics95 Serial 56
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Author Böhm, Corrado; Tronci, Enrico
Title X-Separability and Left-Invertibility in lambda-calculus Type Conference Article
Year 1987 Publication (down) Symposium on Logic in Computer Science (LICS) Abbreviated Journal
Volume Issue Pages 320-328
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Publisher IEEE Computer Society Place of Publication Ithaca, New York, USA Editor
Language Summary Language Original Title
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Notes Approved yes
Call Number Sapienza @ mari @ lics87 Serial 63
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