| Records |
| Author |
Cesta, Amedeo; Finzi, Alberto; Fratini, Simone; Orlandini, Andrea; Tronci, Enrico |
| Title |
Verifying Flexible Timeline-based Plans |
Type |
Conference Article |
| Year |
2009 |
Publication |
E-Proc. of ICAPS Workshop on Validation and Verification of Planning and Scheduling Systems |
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| Abstract |
The synthesis of flexible temporal plans has demonstrated wide applications possibilities in heterogeneous domains. We are currently studying the connection between plan generation and execution from the particular perspective of verifying a flexible plan before actual execution. This paper explores how a model-checking verification tool, based on UPPAAL-TIGA, is suitable for verifying flexible temporal plans. We first describe the formal model, the formalism, and the verification method. Furthermore we discuss our own approach and some preliminary empirical results using a real-world case study. |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ Vvps09 |
Serial |
23 |
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| Author |
Campagnano, Edoardo; Ciancamerla, Ester; Minichino, Michele; Tronci, Enrico |
| Title |
Automatic Analysis of a Safety Critical Tele Control System |
Type |
Conference Article |
| Year |
2005 |
Publication |
24th International Conference on: Computer Safety, Reliability, and Security (SAFECOMP) |
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Issue |
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Pages |
94-107 |
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| Abstract |
We show how the Mur$\varphi$ model checker can be used to automatically carry out safety analysis of a quite complex hybrid system tele-controlling vehicles traffic inside a safety critical transport infrastructure such as a long bridge or a tunnel. We present the Mur$\varphi$ model we developed towards this end as well as the experimental results we obtained by running the Mur$\varphi$ verifier on our model. Our experimental results show that the approach presented here can be used to verify safety of critical dimensioning parameters (e.g. bandwidth) of the telecommunication network embedded in a safety critical system. |
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| Publisher |
Springer |
Place of Publication |
Fredrikstad, Norway |
Editor |
Winther, R.; Gran, B. A.; Dahll, G. |
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Series Title |
Lecture Notes in Computer Science |
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| Series Volume |
3688 |
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| ISSN |
3-540-29200-4 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ safecomp05 |
Serial |
32 |
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| Author |
Lanotte, Ruggero; Maggiolo-Schettini, Andrea; Tini, Simone; Troina, Angelo; Tronci, Enrico |
| Title |
Automatic Covert Channel Analysis of a Multilevel Secure Component |
Type |
Conference Article |
| Year |
2004 |
Publication |
Information and Communications Security, 6th International Conference, ICICS 2004, Malaga, Spain, October 27-29, 2004, Proceedings |
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249-261 |
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The NRL Pump protocol defines a multilevel secure component whose goal is to minimize leaks of information from high level systems to lower level systems, without degrading average time performances. We define a probabilistic model for the NRL Pump and show how a probabilistic model checker (FHP-mur$\varphi$) can be used to estimate the capacity of a probabilistic covert channel in the NRL Pump. We are able to compute the probability of a security violation as a function of time for various configurations of the system parameters (e.g. buffer sizes, moving average size, etc). Because of the model complexity, our results cannot be obtained using an analytical approach and, because of the low probabilities involved, it can be hard to obtain them using a simulator. |
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Springer |
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Editor |
Lopez, J.; Qing, S.; Okamoto, E. |
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Lecture Notes in Computer Science |
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| Series Volume |
3269 |
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yes |
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Sapienza @ mari @ icics04 |
Serial |
34 |
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| Author |
Martinelli, Marco; Tronci, Enrico; Dipoppa, Giovanni; Balducelli, Claudio |
| Title |
Electric Power System Anomaly Detection Using Neural Networks |
Type |
Conference Article |
| Year |
2004 |
Publication |
8th International Conference on: Knowledge-Based Intelligent Information and Engineering Systems (KES) |
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Pages |
1242-1248 |
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| Abstract |
The aim of this work is to propose an approach to monitor and protect Electric Power System by learning normal system behaviour at substations level, and raising an alarm signal when an abnormal status is detected; the problem is addressed by the use of autoassociative neural networks, reading substation measures. Experimental results show that, through the proposed approach, neural networks can be used to learn parameters underlaying system behaviour, and their output processed to detecting anomalies due to hijacking of measures, changes in the power network topology (i.e. transmission lines breaking) and unexpected power demand trend. |
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| Publisher |
Springer |
Place of Publication |
Wellington, New Zealand |
Editor |
Negoita, M.G.; Howlett, R.J.; Jain, L.C. |
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Series Title |
Lecture Notes in Computer Science |
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| Series Volume |
3213 |
Series Issue |
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Edition |
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| ISSN |
3-540-23318-0 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ kes04 |
Serial |
35 |
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| Author |
Ciancamerla, Ester; Minichino, Michele; Serro, Stefano; Tronci, Enrico |
| Title |
Automatic Timeliness Verification of a Public Mobile Network |
Type |
Conference Article |
| Year |
2003 |
Publication |
22nd International Conference on Computer Safety, Reliability, and Security (SAFECOMP) |
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Pages |
35-48 |
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This paper deals with the automatic verification of the timeliness of Public Mobile Network (PMN), consisting of Mobile Nodes (MNs) and Base Stations (BSs). We use the Mur$\varphi$ Model Checker to verify that the waiting access time of each MN, under different PMN configurations and loads, and different inter arrival times of MNs in a BS cell, is always below a preassigned threshold. Our experimental results show that Model Checking can be successfully used to generate worst case scenarios and nicely complements probabilistic methods and simulation which are typically used for performance evaluation. |
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Springer |
Place of Publication |
Edinburgh, UK |
Editor |
Anderson, S.; Felici, M.; Littlewood, B. |
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Series Title |
Lecture Notes in Computer Science |
Abbreviated Series Title |
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| Series Volume |
2788 |
Series Issue |
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Edition |
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| ISSN |
978-3-540-20126-7 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ safecomp03 |
Serial |
38 |
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| Author |
Della Penna, Giuseppe; Intrigila, Benedetto; Tronci, Enrico; Venturini Zilli, Marisa |
| Title |
Exploiting Transition Locality in the Disk Based Mur$\varphi$ Verifier |
Type |
Conference Article |
| Year |
2002 |
Publication |
4th International Conference on Formal Methods in Computer-Aided Design (FMCAD) |
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Issue |
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Pages |
202-219 |
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The main obstruction to automatic verification of Finite State Systems is the huge amount of memory required to complete the verification task (state explosion). This motivates research on distributed as well as disk based verification algorithms. In this paper we present a disk based Breadth First Explicit State Space Exploration algorithm as well as an implementation of it within the Mur$\varphi$ verifier. Our algorithm exploits transition locality (i.e. the statistical fact that most transitions lead to unvisited states or to recently visited states) to decrease disk read accesses thus reducing the time overhead due to disk usage. A disk based verification algorithm for Mur$\varphi$ has been already proposed in the literature. To measure the time speed up due to locality exploitation we compared our algorithm with such previously proposed algorithm. Our experimental results show that our disk based verification algorithm is typically more than 10 times faster than such previously proposed disk based verification algorithm. To measure the time overhead due to disk usage we compared our algorithm with RAM based verification using the (standard) Mur$\varphi$ verifier with enough memory to complete the verification task. Our experimental results show that even when using 1/10 of the RAM needed to complete verification, our disk based algorithm is only between 1.4 and 5.3 times (3 times on average) slower than (RAM) Mur$\varphi$ with enough RAM memory to complete the verification task at hand. Using our disk based Mur$\varphi$ we were able to complete verification of a protocol with about $10^9$ reachable states. This would require more than 5 gigabytes of RAM using RAM based Mur$\varphi$. |
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Springer |
Place of Publication |
Portland, OR, USA |
Editor |
Aagaard, M.; O'Leary, J.W. |
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Series Title |
Lecture Notes in Computer Science |
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| Series Volume |
2517 |
Series Issue |
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Edition |
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| ISSN |
3-540-00116-6 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ fmcad02 |
Serial |
41 |
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| Author |
Gribaudo, Marco; Horváth, Andras; Bobbio, Andrea; Tronci, Enrico; Ciancamerla, Ester; Minichino, Michele |
| Title |
Model-Checking Based on Fluid Petri Nets for the Temperature Control System of the ICARO Co-generative Plant |
Type |
Conference Article |
| Year |
2002 |
Publication |
21st International Conference on Computer Safety, Reliability and Security (SAFECOMP) |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
273-283 |
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| Abstract |
The modeling and analysis of hybrid systems is a recent and challenging research area which is actually dominated by two main lines: a functional analysis based on the description of the system in terms of discrete state (hybrid) automata (whose goal is to ascertain for conformity and reachability properties), and a stochastic analysis (whose aim is to provide performance and dependability measures). This paper investigates a unifying view between formal methods and stochastic methods by proposing an analysis methodology of hybrid systems based on Fluid Petri Nets (FPN). It is shown that the same FPN model can be fed to a functional analyser for model checking as well as to a stochastic analyser for performance evaluation. We illustrate our approach and show its usefulness by applying it to a “real world†hybrid system: the temperature control system of a co-generative plant. |
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Springer |
Place of Publication |
Catania, Italy |
Editor |
Anderson, S.; Bologna, S.; Felici, M. |
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Series Title |
Lecture Notes in Computer Science |
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| Series Volume |
2434 |
Series Issue |
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Edition |
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| ISSN |
3-540-44157-3 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ safecomp02 |
Serial |
42 |
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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 |
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Issue |
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Pages |
317-324 |
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| 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. |
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IEEE Computer Society |
Place of Publication |
Macau, China |
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0-7695-1408-1 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ apsec01 |
Serial |
43 |
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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) |
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Issue |
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Pages |
259-274 |
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| 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. |
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Springer |
Place of Publication |
Livingston, Scotland, UK |
Editor |
Margaria, T.; Melham, T.F. |
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Series Title |
Lecture Notes in Computer Science |
Abbreviated Series Title |
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| Series Volume |
2144 |
Series Issue |
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Edition |
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| ISSN |
3-540-42541-1 |
ISBN |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ charme01 |
Serial |
44 |
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| Author |
Dipoppa, G.; D'Alessandro, G.; Semprini, R.; Tronci, E. |
| Title |
Integrating Automatic Verification of Safety Requirements in Railway Interlocking System Design |
Type |
Conference Article |
| Year |
2001 |
Publication |
High Assurance Systems Engineering, 2001. Sixth IEEE International Symposium on |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
209-219 |
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| Abstract |
A railway interlocking system (RIS) is an embedded system (namely a supervisory control system) that ensures the safe, operation of the devices in a railway station. RIS is a safety critical system. We explore the possibility of integrating automatic formal verification methods in a given industry RIS design flow. The main obstructions to be overcome in our work are: selecting a formal verification tool that is efficient enough to solve the verification problems at hand; and devising a cost effective integration strategy for such tool. We were able to devise a successful integration strategy meeting the above constraints without requiring major modification in the pre-existent design flow nor retraining of personnel. We run verification experiments for a RIS designed for the Singapore Subway. The experiments show that the RIS design flow obtained from our integration strategy is able to automatically verify real life RIS designs. |
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IEEE Computer Society |
Place of Publication |
Albuquerque, NM, USA |
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Series Issue |
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Edition |
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| ISSN |
0-7695-1275-5 |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ hase01 |
Serial |
45 |
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