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Author Della Penna, Giuseppe; Intrigila, Benedetto; Magazzeni, Daniele; Melatti, Igor; Tronci, Enrico
Title CGMurphi: Automatic synthesis of numerical controllers for nonlinear hybrid systems Type Journal Article
Year 2013 Publication European Journal of Control Abbreviated Journal European Journal of Control
Volume 19 Issue 1 Pages 14-36
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Abstract
Address
Corporate Author Thesis
Publisher Elsevier North-Holland, Inc. Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0947-3580 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number Sapienza @ melatti @ Serial 114
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Author Intrigila, Benedetto; Salvo, Ivano; Sorgi, Stefano
Title A characterization of weakly Church-Rosser abstract reduction systems that are not Church-Rosser Type Journal Article
Year 2001 Publication Information and Computation Abbreviated Journal
Volume 171 Issue 2 Pages 137-155
Keywords
Abstract Basic properties of rewriting systems can be stated in the framework of abstract reduction systems (ARS). Properties like confluence (or Church-Rosser, CR) and weak confluence (or weak Church-Rosser, WCR) and their relationships can be studied in this setting: as a matter of fact, well-known counterexamples to the implication WCR CR have been formulated as ARS. In this paper, starting from the observation that such counterexamples are structurally similar, we set out a graph-theoretic characterization of WCR ARS that is not CR in terms of a suitable class of reduction graphs, such that in every WCR not CR ARS, we can embed at least one element of this class. Moreover, we give a tighter characterization for a restricted class of ARS enjoying a suitable regularity condition. Finally, as a consequence of our approach, we prove some interesting results about ARS using the mathematical tools developed. In particular, we prove an extension of the Newman’s lemma and we find out conditions that, once assumed together with WCR property, ensure the unique normal form property. The Appendix treats two interesting examples, both generated by graph-rewriting rules, with specific combinatorial properties.
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Corporate Author Thesis
Publisher Academic Press, Inc. Place of Publication Duluth, MN, USA Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0890-5401 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Intrigila-Salvo-Sorgi:01 Serial 68
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Author Melatti, Igor; Palmer, Robert; Sawaya, Geoffrey; Yang, Yu; Kirby, Robert Mike; Gopalakrishnan, Ganesh
Title Parallel and Distributed Model Checking in Eddy Type Conference Article
Year 2006 Publication Model Checking Software, 13th International SPIN Workshop, Vienna, Austria, March 30 – April 1, 2006, Proceedings Abbreviated Journal
Volume Issue Pages 108-125
Keywords
Abstract Model checking of safety properties can be scaled up by pooling the CPU and memory resources of multiple computers. As compute clusters containing 100s of nodes, with each node realized using multi-core (e.g., 2) CPUs will be widespread, a model checker based on the parallel (shared memory) and distributed (message passing) paradigms will more efficiently use the hardware resources. Such a model checker can be designed by having each node employ two shared memory threads that run on the (typically) two CPUs of a node, with one thread responsible for state generation, and the other for efficient communication, including (i) performing overlapped asynchronous message passing, and (ii) aggregating the states to be sent into larger chunks in order to improve communication network utilization. We present the design details of such a novel model checking architecture called Eddy. We describe the design rationale, details of how the threads interact and yield control, exchange messages, as well as detect termination. We have realized an instance of this architecture for the Murphi modeling language. Called Eddy_Murphi, we report its performance over the number of nodes as well as communication parameters such as those controlling state aggregation. Nearly linear reduction of compute time with increasing number of nodes is observed. Our thread task partition is done in such a way that it is modular, easy to port across different modeling languages, and easy to tune across a variety of platforms.
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Corporate Author Thesis
Publisher Springer - Verlag Place of Publication Editor Valmari, A.
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 3925 Series Issue Edition
ISSN (down) 0302-9743 ISBN 978-3-540-33102-5 Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Mpsykg06 Serial 81
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Author Alimguzhin, Vadim; Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico
Title On-the-Fly Control Software Synthesis Type Conference Article
Year 2013 Publication Proceedings of International SPIN Symposium on Model Checking of Software (SPIN 2013) Abbreviated Journal International SPIN Symposium on Model Checking of Software
Volume Issue Pages 61-80
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Abstract
Address
Corporate Author Thesis
Publisher Springer - Verlag Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 7976 Series Issue Edition
ISSN (down) 0302-9743 ISBN 978-3-642-39175-0 Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ melatti @ Serial 111
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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 Conference Article
Year 2013 Publication Proc. of International SPIN Symposium on Model Checking of Software (SPIN 2013) Abbreviated Journal International SPIN Symposium on Model Checking of Software
Volume Issue Pages 43-60
Keywords
Abstract
Address
Corporate Author Thesis
Publisher Springer - Verlag Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 7976 Series Issue Edition
ISSN (down) 0302-9743 ISBN 978-3-642-39175-0 Medium
Area Expedition Conference
Notes Approved no
Call Number Sapienza @ melatti @ Serial 112
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Author Mancini, Toni; Mari, Federico; Massini, Annalisa; Melatti, Igor; Merli, Fabio; Tronci, Enrico
Title System Level Formal Verification via Model Checking Driven Simulation Type Conference Article
Year 2013 Publication Proceedings of the 25th International Conference on Computer Aided Verification. July 13-19, 2013, Saint Petersburg, Russia Abbreviated Journal CAV 2013
Volume Issue Pages 296-312
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Abstract
Address
Corporate Author Thesis
Publisher Springer - Verlag Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Lecture Notes in Computer Science Abbreviated Series Title
Series Volume 8044 Series Issue Edition
ISSN (down) 0302-9743 ISBN 978-3-642-39798-1 Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Serial 113
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Author Intrigila, Benedetto; Melatti, Igor; Tofani, Alberto; Macchiarelli, Guido
Title Computational models of myocardial endomysial collagen arrangement Type Journal Article
Year 2007 Publication Computer Methods and Programs in Biomedicine Abbreviated Journal
Volume 86 Issue 3 Pages 232-244
Keywords
Abstract Collagen extracellular matrix is one of the factors related to high passive stiffness of cardiac muscle. However, the architecture and the mechanical aspects of the cardiac collagen matrix are not completely known. In particular, endomysial collagen contribution to the passive mechanics of cardiac muscle as well as its micro anatomical arrangement is still a matter of debate. In order to investigate mechanical and structural properties of endomysial collagen, we consider two alternative computational models of some specific aspects of the cardiac muscle. These two models represent two different views of endomysial collagen distribution: (1) the traditional view and (2) a new view suggested by the data obtained from scanning electron microscopy (SEM) in NaOH macerated samples (a method for isolating collagen from the other tissue). We model the myocardial tissue as a net of spring elements representing the cardiomyocytes together with the endomysial collagen distribution. Each element is a viscous elastic spring, characterized by an elastic and a viscous constant. We connect these springs to imitate the interconnections between collagen fibers. Then we apply to the net of springs some external forces of suitable magnitude and direction, obtaining an extension of the net itself. In our setting, the ratio forces magnitude /net extension is intended to model the stress /strain ratio of a microscopical portion of the myocardial tissue. To solve the problem of the correct identification of the values of the different parameters involved, we use an artificial neural network approach. In particular, we use this technique to learn, given a distribution of external forces, the elastic constants of the springs needed to obtain a desired extension as an equilibrium position. Our experimental findings show that, in the model of collagen distribution structured according to the new view, a given stress /strain ratio (of the net of springs, in the sense specified above) is obtained with much smaller (w.r.t. the other model, corresponding to the traditional view) elasticity constants of the springs. This seems to indicate that by an appropriate structure, a given stiffness of the myocardial tissue can be obtained with endomysial collagen fibers of much smaller size.
Address
Corporate Author Thesis
Publisher Elsevier North-Holland, Inc. Place of Publication New York, NY, USA Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0169-2607 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Imtm07 Serial 82
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Author Della Penna, Giuseppe; Di Marco, Antinisca; Intrigila, Benedetto; Melatti, Igor; Pierantonio, Alfonso
Title Interoperability mapping from XML schemas to ER diagrams Type Journal Article
Year 2006 Publication Data Knowl. Eng. Abbreviated Journal
Volume 59 Issue 1 Pages 166-188
Keywords
Abstract The eXtensible Markup Language (XML) is a de facto standard on the Internet and is now being used to exchange a variety of data structures. This leads to the problem of efficiently storing, querying and retrieving a great amount of data contained in XML documents. Unfortunately, XML data often need to coexist with historical data. At present, the best solution for storing XML into pre-existing data structures is to extract the information from the XML documents and adapt it to the data structures’ logical model (e.g., the relational model of a DBMS). In this paper, we introduce a technique called Xere (XML entity–relationship exchange) to assist the integration of XML data with other data sources. To this aim, we present an algorithm that maps XML schemas into entity–relationship diagrams, discuss its soundness and completeness and show its implementation in XSLT.
Address
Corporate Author Thesis
Publisher Elsevier Science Publishers B. V. Place of Publication Amsterdam, The Netherlands, The Netherlands Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0169-023x ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Sapienza @ mari @ Ddimp06 Serial 77
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Author Mancini, T.; Mari, F.; Massini, A.; Melatti, I.; Tronci, E.
Title Anytime system level verification via parallel random exhaustive hardware in the loop simulation Type Journal Article
Year 2016 Publication Microprocessors and Microsystems Abbreviated Journal
Volume 41 Issue Pages 12-28
Keywords Model Checking of Hybrid Systems; Model checking driven simulation; Hardware in the loop simulation
Abstract Abstract System level verification of cyber-physical systems has the goal of verifying that the whole (i.e., software + hardware) system meets the given specifications. Model checkers for hybrid systems cannot handle system level verification of actual systems. Thus, Hardware In the Loop Simulation (HILS) is currently the main workhorse for system level verification. By using model checking driven exhaustive HILS, System Level Formal Verification (SLFV) can be effectively carried out for actual systems. We present a parallel random exhaustive HILS based model checker for hybrid systems that, by simulating all operational scenarios exactly once in a uniform random order, is able to provide, at any time during the verification process, an upper bound to the probability that the System Under Verification exhibits an error in a yet-to-be-simulated scenario (Omission Probability). We show effectiveness of the proposed approach by presenting experimental results on SLFV of the Inverted Pendulum on a Cart and the Fuel Control System examples in the Simulink distribution. To the best of our knowledge, no previously published model checker can exhaustively verify hybrid systems of such a size and provide at any time an upper bound to the Omission Probability.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0141-9331 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number MCLab @ davi @ Mancini201612 Serial 155
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Author Alimguzhin, V.; Mari, F.; Melatti, I.; Salvo, I.; Tronci, E.
Title Linearising Discrete Time Hybrid Systems Type Journal Article
Year 2017 Publication IEEE Transactions on Automatic Control Abbreviated Journal
Volume 62 Issue 10 Pages 5357-5364
Keywords
Abstract Model Based Design approaches for embedded systems aim at generating correct-by-construction control software, guaranteeing that the closed loop system (controller and plant) meets given system level formal specifications. This technical note addresses control synthesis for safety and reachability properties of possibly non-linear discrete time hybrid systems. By means of syntactical transformations that require non-linear terms to be Lipschitz continuous functions, we over-approximate non-linear dynamics with a linear system whose controllers are guaranteed to be controllers of the original system. We evaluate performance of our approach on meaningful control synthesis benchmarks, also comparing it to a state-of-the-art tool.
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 0018-9286 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number Sapienza @ mari @ ref7902199 Serial 164
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