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	Author	Cavaliere, Federico; Mari, Federico; Melatti, Igor; Minei, Giovanni; Salvo, Ivano; Tronci, Enrico; Verzino, Giovanni; Yushtein, Yuri
	Title	Model Checking Satellite Operational Procedures			Type	Conference Article
	Year	2011	Publication	DAta Systems In Aerospace (DASIA), Org. EuroSpace, Canadian Space Agency, CNES, ESA, EUMETSAT. San Anton, Malta, EuroSpace.	Abbreviated Journal
	Volume		Issue		Pages
	Keywords
	Abstract	We present a model checking approach for the automatic verification of satellite operational procedures (OPs). Building a model for a complex system as a satellite is a hard task. We overcome this obstruction by using a suitable simulator (SIMSAT) for the satellite. Our approach aims at improving OP quality assurance by automatic exhaustive exploration of all possible simulation scenarios. Moreover, our solution decreases OP verification costs by using a model checker (CMurphi) to automatically drive the simulator. We model OPs as user-executed programs observing the simulator telemetries and sending telecommands to the simulator. In order to assess feasibility of our approach we present experimental results on a simple meaningful scenario. Our results show that we can save up to 90% of verification time.
	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		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ Dasia11			Serial	13
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	Author	Mazzini, Silvia; Puri, Stefano; Mari, Federico; Melatti, Igor; Tronci, Enrico
	Title	Formal Verification at System Level			Type	Conference Article
	Year	2009	Publication	In: DAta Systems In Aerospace (DASIA), Org. EuroSpace, Canadian Space Agency, CNES, ESA, EUMETSAT. Instanbul, Turkey, EuroSpace	Abbreviated Journal
	Volume		Issue		Pages
	Keywords
	Abstract	System Level Analysis calls for a language comprehensible to experts with different background and yet precise enough to support meaningful analyses. SysML is emerging as an effective balance between such conflicting goals. In this paper we outline some the results obtained as for SysML based system level functional formal verification by an ESA/ESTEC study, with a collaboration among INTECS and La Sapienza University of Roma. The study focuses on SysML based system level functional requirements techniques.
	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		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ Dasia09			Serial	20
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	Author	Bobbio, Andrea; Ciancamerla, Ester; Di Blasi, Saverio; Iacomini, Alessandro; Mari, Federico; Melatti, Igor; Minichino, Michele; Scarlatti, Alessandro; Tronci, Enrico; Terruggia, Roberta; Zendri, Emilio
	Title	Risk analysis via heterogeneous models of SCADA interconnecting Power Grids and Telco networks			Type	Conference Article
	Year	2009	Publication	Proceedings of Fourth International Conference on Risks and Security of Internet and Systems (CRiSIS)	Abbreviated Journal
	Volume		Issue		Pages	90-97
	Keywords
	Abstract	The automation of power grids by means of supervisory control and data acquisition (SCADA) systems has led to an improvement of power grid operations and functionalities but also to pervasive cyber interdependencies between power grids and telecommunication networks. Many power grid services are increasingly depending upon the adequate functionality of SCADA system which in turn strictly depends on the adequate functionality of its communication infrastructure. We propose to tackle the SCADA risk analysis by means of different and heterogeneous modeling techniques and software tools. We demonstrate the applicability of our approach through a case study on an actual SCADA system for an electrical power distribution grid. The modeling techniques we discuss aim at providing a probabilistic dependability analysis, followed by a worst case analysis in presence of malicious attacks and a real-time performance evaluation.
	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		ISBN		Medium
	Area		Expedition		Conference	Fourth International Conference on Risks and Security of Internet and Systems (CRiSIS)
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ crisis09			Serial	17
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	Author	Coppo, Mario; Dezani-Ciancaglini, Mariangiola; Giovannetti, Elio; Salvo, Ivano
	Title	Mobility Types for Mobile Processes in Mobile Ambients			Type	Journal Article
	Year	2003	Publication	Electr. Notes Theor. Comput. Sci.	Abbreviated Journal
	Volume	78	Issue		Pages
	Keywords
	Abstract	We present an ambient-like calculus in which the open capability is dropped, and a new form of Ã¢â‚¬Å“lightweightÃ¢â‚¬Â process mobility is introduced. The calculus comes equipped with a type system that allows the kind of values exchanged in communications and the access and mobility properties of processes to be controlled. A type inference procedure determines the Ã¢â‚¬Å“minimalÃ¢â‚¬Â requirements to accept a system or a component as well typed. This gives a kind of principal typing. As an expressiveness test, we show that some well known calculi of concurrency and mobility can be encoded in our calculus in a natural way.
	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		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ Coppo-Dezani-Giovannetti-Salvo:03			Serial	74
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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.
	Address
	Corporate Author				Thesis
	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	Tronci, Enrico; Della Penna, Giuseppe; Intrigila, Benedetto; Venturini Zilli, Marisa
	Title	Exploiting Transition Locality in Automatic Verification			Type	Conference Article
	Year	2001	Publication	11th IFIP WG 10.5 Advanced Research Working Conference on Correct Hardware Design and Verification Methods (CHARME)	Abbreviated Journal
	Volume		Issue		Pages	259-274
	Keywords
	Abstract	In this paper we present an algorithm to contrast state explosion when using Explicit State Space Exploration to verify protocols. We show experimentally that protocols exhibit transition locality. We present a verification algorithm that exploits transition locality as well as an implementation of it within the Mur$\varphi$ verifier. Our algorithm is compatible with all Breadth First (BF) optimization techniques present in the Mur$\varphi$ verifier and it is by no means a substitute for any of them. In fact, since our algorithm trades space with time, it is typically most useful when one runs out of memory and has already used all other state reduction techniques present in the Mur$\varphi$ verifier. Our experimental results show that using our approach we can typically save more than 40% of RAM with an average time penalty of about 50% when using (Mur$\varphi$) bit compression and 100% when using bit compression and hash compaction.
	Address
	Corporate Author				Thesis
	Publisher	Springer	Place of Publication	Livingston, Scotland, UK	Editor	Margaria, T.; Melham, T.F.
	Language		Summary Language		Original Title
	Series Editor		Series Title	Lecture Notes in Computer Science	Abbreviated Series Title
	Series Volume	2144	Series Issue		Edition
	ISSN	3-540-42541-1	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ charme01			Serial	44
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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
	Keywords
	Abstract
	Address
	Corporate Author				Thesis
	Publisher	IEEE	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN	978-1-4673-2065-8	Medium
	Area		Expedition		Conference
	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	Mari, Federico; Melatti, Igor; Salvo, Ivano; Tronci, Enrico
	Title	Synthesis of Quantized Feedback Control Software for Discrete Time Linear Hybrid Systems			Type	Conference Article
	Year	2010	Publication	Computer Aided Verification	Abbreviated Journal
	Volume		Issue		Pages	180-195
	Keywords
	Abstract	We present an algorithm that given a Discrete Time Linear Hybrid System returns a correct-by-construction software implementation K for a (near time optimal) robust quantized feedback controller for along with the set of states on which K is guaranteed to work correctly (controllable region). Furthermore, K has a Worst Case Execution Time linear in the number of bits of the quantization schema.
	Address
	Corporate Author				Thesis
	Publisher	Springer Berlin / Heidelberg	Place of Publication		Editor	Touili, T.; Cook, B.; Jackson, P.
	Language		Summary Language		Original Title
	Series Editor		Series Title	Lecture Notes in Computer Science	Abbreviated Series Title
	Series Volume	6174	Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ cav2010			Serial	16
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	Author	Barbanera, Franco; Dezani-Ciancaglini, Mariangiola; Salvo, Ivano; Sassone, Vladimiro
	Title	A Type Inference Algorithm for Secure Ambients			Type	Journal Article
	Year	2002	Publication	Electronic Notes in Theoretical Computer Science	Abbreviated Journal
	Volume	62	Issue		Pages	83-101
	Keywords
	Abstract	We consider a type discipline for the Ambient Calculus that associates ambients with security levels and constrains them to be traversed by or opened in ambients of higher security clearance only. We present a bottom-up algorithm that, given an untyped process P, computes a minimal set of constraints on security levels such that all actions during runs of P are performed without violating the security level priorities. Such an algorithm appears to be a prerequisite to use type systems to ensure security properties in the web scenario.
	Address
	Corporate Author				Thesis
	Publisher	Elsevier	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes	TOSCA 2001, Theory of Concurrency, Higher Order Languages and Types			Approved	yes
	Call Number	Sapienza @ mari @ Barbanera-Dezani-Salvo-Sassone:01			Serial	73
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	Author	Tronci, Enrico; Della Penna, Giuseppe; Intrigila, Benedetto; Venturini Zilli, Marisa
	Title	A Probabilistic Approach to Automatic Verification of Concurrent Systems			Type	Conference Article
	Year	2001	Publication	8th Asia-Pacific Software Engineering Conference (APSEC)	Abbreviated Journal
	Volume		Issue		Pages	317-324
	Keywords
	Abstract	The main barrier to automatic verification of concurrent systems is the huge amount of memory required to complete the verification task (state explosion). In this paper we present a probabilistic algorithm for automatic verification via model checking. Our algorithm trades space with time. In particular, when memory is full because of state explosion our algorithm does not give up verification. Instead it just proceeds at a lower speed and its results will only hold with some arbitrarily small error probability. Our preliminary experimental results show that by using our probabilistic algorithm we can typically save more than 30% of RAM with an average time penalty of about 100% w.r.t. a deterministic state space exploration with enough memory to complete the verification task. This is better than giving up the verification task because of lack of memory.
	Address
	Corporate Author				Thesis
	Publisher	IEEE Computer Society	Place of Publication	Macau, China	Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0-7695-1408-1	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	Sapienza @ mari @ apsec01			Serial	43
Permanent link to this record