| Records |
| Author |
Tronci, Enrico |
| Title |
Automatic Synthesis of Controllers from Formal Specifications |
Type |
Conference Article |
| Year |
1998 |
Publication |
Proc of 2nd IEEE International Conference on Formal Engineering Methods (ICFEM) |
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Pages |
134-143 |
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| Abstract |
Many safety critical reactive systems are indeed embedded control systems. Usually a control system can be partitioned into two main subsystems: a controller and a plant. Roughly speaking: the controller observes the state of the plant and sends commands (stimulus) to the plant to achieve predefined goals. We show that when the plant can be modeled as a deterministic finite state system (FSS) it is possible to effectively use formal methods to automatically synthesize the program implementing the controller from the plant model and the given formal specifications for the closed loop system (plant+controller). This guarantees that the controller program is correct by construction. To the best of our knowledge there is no previously published effective algorithm to extract executable code for the controller from closed loop formal specifications. We show practical usefulness of our techniques by giving experimental results on their use to synthesize C programs implementing optimal controllers (OCs) for plants with more than 109 states. |
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Brisbane, Queensland, Australia |
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yes |
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Sapienza @ mari @ icfem98 |
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52 |
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| Author |
Tronci, Enrico |
| Title |
Equational Programming in Lambda-Calculus via SL-Systems. Part 1 |
Type |
Journal Article |
| Year |
1996 |
Publication |
Theoretical Computer Science |
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| Volume |
160 |
Issue |
1&2 |
Pages |
145-184 |
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yes |
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Sapienza @ mari @ tcs96 |
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54 |
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| Author |
Tronci, Enrico |
| Title |
Equational Programming in Lambda-Calculus via SL-Systems. Part 2 |
Type |
Journal Article |
| Year |
1996 |
Publication |
Theoretical Computer Science |
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160 |
Issue |
1&2 |
Pages |
185-216 |
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yes |
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Sapienza @ mari @ tcs96a |
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55 |
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| Author |
Tronci, Enrico |
| Title |
Equational Programming in lambda-calculus |
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Conference Article |
| Year |
1991 |
Publication |
Sixth Annual IEEE Symposium on Logic in Computer Science (LICS) |
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191-202 |
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IEEE Computer Society |
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Amsterdam, The Netherlands |
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yes |
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Sapienza @ mari @ lics91 |
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58 |
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| Author |
Bobbio, Andrea; Bologna, Sandro; Minichino, Michele; Ciancamerla, Ester; Incalcaterra, Piero; Kropp, Corrado; Tronci, Enrico |
| Title |
Advanced techniques for safety analysis applied to the gas turbine control system of Icaro co generative plant |
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Conference Article |
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2001 |
Publication |
X Convegno Tecnologie e Sistemi Energetici Complessi |
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339-350 |
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The paper describes two complementary and integrable approaches, a probabilistic one and a deterministic one, based on classic and advanced modelling techniques for safety analysis of complex computer based systems. The probabilistic approach is based on classical and innovative probabilistic analysis methods. The deterministic approach is based on formal verification methods. Such approaches are applied to the gas turbine control system of ICARO co generative plant, in operation at ENEA CR Casaccia. The main difference between the two approaches, behind the underlining different theories, is that the probabilistic one addresses the control system by itself, as the set of sensors, processing units and actuators, while the deterministic one also includes the behaviour of the equipment under control which interacts with the control system. The final aim of the research, documented in this paper, is to explore an innovative method which put the probabilistic and deterministic approaches in a strong relation to overcome the drawbacks of their isolated, selective and fragmented use which can lead to inconsistencies in the evaluation results. |
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Genova, Italy |
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yes |
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Sapienza @ mari @ tesec01 |
Serial |
65 |
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| Author |
Bucciarelli, Antonio; Salvo, Ivano |
| Title |
Totality, Definability and Boolean Circuits |
Type |
Journal Article |
| Year |
1998 |
Publication |
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| Volume |
1443 |
Issue |
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Pages |
808-819 |
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In the type frame originating from the flat domain of boolean values, we single out elements which are hereditarily total. We show that these elements can be defined, up to total equivalence, by sequential programs. The elements of an equivalence class of the totality equivalence relation (totality class) can be seen as different algorithms for computing a given set-theoretic boolean function. We show that the bottom element of a totality class, which is sequential, corresponds to the most eager algorithm, and the top to the laziest one. Finally we suggest a link between size of totality classes and a well known measure of complexity of boolean functions, namely their sensitivity. |
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Springer |
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yes |
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Sapienza @ mari @ bucciarelli-salvo:98 |
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70 |
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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 |
| Keywords |
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 |
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Sapienza @ mari @ bucciarelli-delorenzis-piperno-salvo:99 |
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71 |
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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 |
| Call Number |
Sapienza @ mari @ Bono-Salvo:BOTH01 |
Serial |
72 |
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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 |
| Call Number |
Sapienza @ mari @ Barbanera-Dezani-Salvo-Sassone:01 |
Serial |
73 |
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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. |
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78 |
Issue |
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We present an ambient-like calculus in which the open capability is dropped, and a new form of “lightweight  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 “minimal  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. |
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yes |
| Call Number |
Sapienza @ mari @ Coppo-Dezani-Giovannetti-Salvo:03 |
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74 |
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