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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 | ||
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| 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. | ||||
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| 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 | 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 | |
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| 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. | ||||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Dasia09 | Serial | 20 | ||
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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 |
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| 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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| ISSN | 0018-9286 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Sapienza @ mari @ ref7902199 | Serial | 164 | ||
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| Author | Intrigila, Benedetto; Magazzeni, Daniele; Melatti, Igor; Tronci, Enrico | ||||
| Title | A Model Checking Technique for the Verification of Fuzzy Control Systems | Type | Conference Article | ||
| Year | 2005 | Publication | CIMCA '05: Proceedings of the International Conference on Computational Intelligence for Modelling, Control and Automation and International Conference on Intelligent Agents, Web Technologies and Internet Commerce Vol-1 (CIMCA-IAWTIC'06) | Abbreviated Journal | |
| Volume | Issue | Pages | 536-542 | ||
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| Abstract | Fuzzy control is well known as a powerful technique for designing and realizing control systems. However, statistical evidence for their correct behavior may be not enough, even when it is based on a large number of samplings. In order to provide a more systematic verification process, the cell-to-cell mapping technology has been used in a number of cases as a verification tool for fuzzy control systems and, more recently, to assess their optimality and robustness. However, cell-to-cell mapping is typically limited in the number of cells it can explore. To overcome this limitation, in this paper we show how model checking techniques may be instead used to verify the correct behavior of a fuzzy control system. To this end, we use a modified version of theMurphi verifier, which ease the modeling phase by allowing to use finite precision real numbers and external C functions. In this way, also already designed simulators may be used for the verification phase. With respect to the cell mapping technique, our approach appears to be complementary; indeed, it explores a much larger number of states, at the cost of being less informative on the global dynamic of the system. | ||||
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| Publisher | IEEE Computer Society | Place of Publication | Washington, DC, USA | Editor |
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| ISSN | 0-7695-2504-0-01 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Immt05 | Serial | 75 | ||
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| Author | Brizzolari, Francesco; Melatti, Igor; Tronci, Enrico; Della Penna, Giuseppe | ||||
| Title | Disk Based Software Verification via Bounded Model Checking | Type | Conference Article | ||
| Year | 2007 | Publication | APSEC '07: Proceedings of the 14th Asia-Pacific Software Engineering Conference | Abbreviated Journal | |
| Volume | Issue | Pages | 358-365 | ||
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| Abstract | One of the most successful approach to automatic software verification is SAT based bounded model checking (BMC). One of the main factors limiting the size of programs that can be automatically verified via BMC is the huge number of clauses that the backend SAT solver has to process. In fact, because of this, the SAT solver may easily run out of RAM. We present two disk based algorithms that can considerably decrease the number of clauses that a BMC backend SAT solver has to process in RAM. Our experimental results show that using our disk based algorithms we can automatically verify programs that are out of reach for RAM based BMC. | ||||
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| Publisher | IEEE Computer Society | Place of Publication | Washington, DC, USA | Editor |
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| ISSN | 0-7695-3057-5 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Bmtd07 | Serial | 76 | ||
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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 |
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| 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. | ||||
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| Publisher | Elsevier Science Publishers B. V. | Place of Publication | Amsterdam, The Netherlands, The Netherlands | Editor |
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| ISSN | 0169-023x | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Ddimp06 | Serial | 77 | ||
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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 | Journal Article | ||
| Year | 2009 | Publication | Int. J. Softw. Tools Technol. Transf. | Abbreviated Journal | |
| Volume | 11 | Issue | 1 | Pages | 13-25 |
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| 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 (1) performing overlapped asynchronous message passing, and (2) 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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| Publisher | Springer-Verlag | Place of Publication | Berlin, Heidelberg | Editor |
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| ISSN | 1433-2779 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Mpsykg09 | Serial | 80 | ||
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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 |
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| 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. | ||||
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| Publisher | Elsevier North-Holland, Inc. | Place of Publication | New York, NY, USA | Editor |
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| ISSN | 0169-2607 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ Imtm07 | Serial | 82 | ||
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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 | Report | ||
| Year | 2012 | Publication | Abbreviated Journal | ||
| Volume | abs/1207.4098 | Issue | Pages | ||
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| Abstract | Many Embedded Systems are indeed Software Based Control Systems, that is control systems whose controller consists of control software running on a microcontroller device. This motivates investigation on Formal Model Based Design approaches for automatic synthesis of embedded systems control software. This paper addresses control software synthesis for discrete time nonlinear systems. We present a methodology to overapproximate the dynamics of a discrete time nonlinear hybrid system H by means of a discrete time linear hybrid system L(H), in such a way that controllers for L(H) are guaranteed to be controllers for H. We present experimental results on the inverted pendulum, a challenging and meaningful benchmark in nonlinear Hybrid Systems control. | ||||
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| Publisher | CoRR, Technical Report | Place of Publication | Editor |
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ | Serial | 103 | ||
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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 | Report | ||
| Year | 2012 | Publication | Abbreviated Journal | ||
| Volume | abs/1210.2276 | Issue | Pages | ||
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| Abstract | Many Control Systems are indeed Software Based Control Systems, i.e. control systems whose controller consists of control software running on a microcontroller device. This motivates investigation on Formal Model Based Design approaches for automatic synthesis of control software.
Available algorithms and tools (e.g., QKS) may require weeks or even months of computation to synthesize control software for large-size systems. This motivates search for parallel algorithms for control software synthesis. In this paper, we present a map-reduce style parallel algorithm for control software synthesis when the controlled system (plant) is modeled as discrete time linear hybrid system. Furthermore we present an MPI-based implementation PQKS of our algorithm. To the best of our knowledge, this is the first parallel approach for control software synthesis. We experimentally show effectiveness of PQKS on two classical control synthesis problems: the inverted pendulum and the multi-input buck DC/DC converter. Experiments show that PQKS efficiency is above 65%. As an example, PQKS requires about 16 hours to complete the synthesis of control software for the pendulum on a cluster with 60 processors, instead of the 25 days needed by the sequential algorithm in QKS. |
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| Publisher | CoRR, Technical Report | Place of Publication | Editor |
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| Notes | Approved | yes | |||
| Call Number | Sapienza @ mari @ | Serial | 101 | ||
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