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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
	Keywords
	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	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 NewmanÃ¢â‚¬â„¢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.
	Address
	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	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.
	Address
	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	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
	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	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	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
	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	8044	Series Issue		Edition
	ISSN	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	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 structuresÃ¢â‚¬â„¢ logical model (e.g., the relational model of a DBMS). In this paper, we introduce a technique called Xere (XML entityÃ‚â€“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 entityÃ‚â€“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	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	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.
	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	0018-9286	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Sapienza @ mari @ ref7902199			Serial	164
Permanent link to this record