| Records |
| Author |
Della Penna, Giuseppe; Intrigila, Benedetto; Tronci, Enrico; Venturini Zilli, Marisa |
| Title |
Synchronized regular expressions |
Type |
Journal Article |
| Year |
2003 |
Publication |
Acta Inf. |
Abbreviated Journal |
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| Volume |
39 |
Issue |
1 |
Pages |
31-70 |
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| Abstract |
Text manipulation is one of the most common tasks for everyone using a computer. The increasing number of textual information in electronic format that every computer user collects everyday also increases the need of more powerful tools to interact with texts. Indeed, much work has been done to provide simple and versatile tools that can be useful for the most common text manipulation tasks. Regular Expressions (RE), introduced by Kleene, are well known in the formal language theory. RE have been extended in various ways, depending on the application of interest. In almost all the implementations of RE search algorithms (e.g. the egrep [15] UNIX command, or the Perl [20] language pattern matching constructs) we find backreferences, i.e. expressions that make reference to the string matched by a previous subexpression. Generally speaking, it seems that all kinds of synchronizations between subexpressions in a RE can be very useful when interacting with texts. In this paper we introduce the Synchronized Regular Expressions (SRE) as an extension of the Regular Expressions. We use SRE to present a formal study of the already known backreferences extension, and of a new extension proposed by us, which we call the synchronized exponents. Moreover, since we are dealing with formalisms that should have a practical utility and be used in real applications, we have the problem of how to present SRE to the final users. Therefore, in this paper we also propose a user-friendly syntax for SRE to be used in implementations of SRE-powered search algorithms. |
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yes |
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Sapienza @ mari @ actainf03 |
Serial |
39 |
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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) |
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Pages |
317-324 |
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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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yes |
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Sapienza @ mari @ apsec01 |
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43 |
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| Author |
Tronci, Enrico |
| Title |
Automatic Synthesis of Control Software for an Industrial Automation Control System |
Type |
Conference Article |
| Year |
1999 |
Publication |
Proc.of: 14th IEEE International Conference on: Automated Software Engineering (ASE) |
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Pages |
247-250 |
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We present a case study on automatic synthesis of control software from formal specifications for an industrial automation control system. Our aim is to compare the effectiveness (i.e. design effort and controller quality) of automatic controller synthesis from closed loop formal specifications with that of manual controller design, followed by automatic verification. Our experimental results show that for industrial automation control systems, automatic synthesis is a viable and profitable (especially as far as design effort is concerned) alternative to manual design, followed by automatic verification. |
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Cocoa Beach, Florida, USA |
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yes |
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Sapienza @ mari @ ase99 |
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49 |
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| Author |
Cesta, Amedeo; Finzi, Alberto; Fratini, Simone; Orlandini, Andrea; Tronci, Enrico |
| Title |
Merging Planning, Scheduling & Verification – A Preliminary Analysis |
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Conference Article |
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2008 |
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In Proc. of 10th ESA Workshop on Advanced Space Technologies for Robotics and Automation (ASTRA) |
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Approved |
yes |
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Sapienza @ mari @ Astra08 |
Serial |
24 |
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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 |
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62 |
Issue |
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Pages |
83-101 |
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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. |
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Elsevier |
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TOSCA 2001, Theory of Concurrency, Higher Order Languages and Types |
Approved |
yes |
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Sapienza @ mari @ Barbanera-Dezani-Salvo-Sassone:01 |
Serial |
73 |
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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 |
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Issue |
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Pages |
358-365 |
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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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IEEE Computer Society |
Place of Publication |
Washington, DC, USA |
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0-7695-3057-5 |
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yes |
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Sapienza @ mari @ Bmtd07 |
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76 |
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| Author |
Bono, V.; Salvo, I. |
| Title |
A CuCh Interpretation of an Object-Oriented Language |
Type |
Journal Article |
| Year |
2001 |
Publication |
Electronic Notes in Theoretical Computer Science |
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50 |
Issue |
2 |
Pages |
159-177 |
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CuCh machine extends pure lambda–calculus with algebraic data types and provides a the possibility of defining functions over the disjoint sum of algebras. We exploit such natural form of overloading to define a functional interpretation of a simple, but significant fragment of a typical object-oriented language. |
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Elsevier |
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BOTH 2001, Bohm’s theorem: applications to Computer Science Theory (Satellite Workshop of ICALP 2001) |
Approved |
yes |
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Sapienza @ mari @ Bono-Salvo:BOTH01 |
Serial |
72 |
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| Author |
Bartolini, Novella; Tronci, Enrico |
| Title |
On Optimizing Service Availability of an Internet Based Architecture for Infrastructure Protection |
Type |
Conference Article |
| Year |
2006 |
Publication |
Cnip |
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yes |
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Sapienza @ mari @ Bt06 |
Serial |
28 |
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| Author |
Bucciarelli, Antonio; de Lorenzis, Silvia; Piperno, Adolfo; Salvo, Ivano |
| Title |
Some Computational Properties of Intersection Types (Extended Abstract) |
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Journal Article |
| Year |
1999 |
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109-118 |
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lambda calculusCurry types, intersection types, lambda-definability, lambda-terms, strong normalization |
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This paper presents a new method for comparing computation-properties of λ-terms typeable with intersection types with respect to terms typeable with Curry types. In particular, strong normalization and λ-definability are investigated. A translation is introduced from intersection typing derivations to Curry typeable terms; the main feature of the proposed technique is that the translation is preserved by β-reduction. This allows to simulate a computation starting from a term typeable in the intersection discipline by means of a computation starting from a simply typeable term. Our approach naturally leads to prove strong normalization in the intersection system by means of purely syntactical techniques. In addition, the presented method enables us to give a proof of a conjecture proposed by Leivant in 1990, namely that all functions uniformly definable using intersection types are already definable using Curry types. |
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IEEE Computer Society |
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yes |
| Call Number |
Sapienza @ mari @ bucciarelli-delorenzis-piperno-salvo:99 |
Serial |
71 |
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| Author |
Bucciarelli, Antonio; Piperno, Adolfo; Salvo, Ivano |
| Title |
Intersection types and λ-definability |
Type |
Journal Article |
| Year |
2003 |
Publication |
Mathematical Structures in Computer Science |
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13 |
Issue |
1 |
Pages |
15-53 |
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This paper presents a novel method for comparing computational properties of λ-terms that are typeable with intersection types, with respect to terms that are typeable with Curry types. We introduce a translation from intersection typing derivations to Curry typeable terms that is preserved by β-reduction: this allows the simulation of a computation starting from a term typeable in the intersection discipline by means of a computation starting from a simply typeable term. Our approach proves strong normalisation for the intersection system naturally by means of purely syntactical techniques. The paper extends the results presented in Bucciarelli et al. (1999) to the whole intersection type system of Barendregt, Coppo and Dezani, thus providing a complete proof of the conjecture, proposed in Leivant (1990), that all functions uniformly definable using intersection types are already definable using Curry types. |
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Cambridge University Press |
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New York, NY, USA |
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0960-1295 |
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yes |
| Call Number |
Sapienza @ mari @ Bucciarelli-Piperno-Salvo:MSCS-03 |
Serial |
69 |
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