| Records |
| Author |
Piperno, Adolfo; Tronci, Enrico |
| Title |
Regular Systems of Equations in λ-calculus |
Type |
Journal Article |
| Year |
1990 |
Publication |
Int. J. Found. Comput. Sci. |
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| Volume |
1 |
Issue |
3 |
Pages |
325-340 |
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| Abstract |
Many problems arising in equational theories like Lambda-calculus and Combinatory Logic can be expressed by combinatory equations or systems of equations. However, the solvability problem for an arbitrarily given class of systems is in general undecidable. In this paper we shall focus our attention on a decidable class of systems, which will be called regular systems, and we shall analyse some classical problems and well-known properties of Lambda-calculus that can be described and solved by means of regular systems. The significance of such class will be emphasized showing that for slight extensions of it the solvability problem turns out to be undecidable. |
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yes |
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Sapienza @ mari @ ijfcs90 |
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60 |
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| Author |
Piperno, Adolfo; Tronci, Enrico |
| Title |
Regular Systems of Equations in λ-calculus |
Type |
Conference Article |
| Year |
1989 |
Publication |
Ictcs |
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Many problems arising in equational theories like Lambda-calculus and Combinatory Logic can be expressed by combinatory equations or systems of equations. However, the solvability problem for an arbitrarily given class of systems is in general undecidable. In this paper we shall focus our attention on a decidable class of systems, which will be called regular systems, and we shall analyse some classical problems and well-known properties of Lambda-calculus that can be described and solved by means of regular systems. The significance of such class will be emphasized showing that for slight extensions of it the solvability problem turns out to be undecidable. |
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Mantova - Italy |
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yes |
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Sapienza @ mari @ ictcs89 |
Serial |
61 |
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| Author |
Böhm, Corrado; Piperno, Adolfo; Tronci, Enrico |
| Title |
Solving Equations in λ-calculus |
Type |
Conference Article |
| Year |
1989 |
Publication |
Proc. of: Logic Colloquium 88 |
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Padova - Italy |
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yes |
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Sapienza @ mari @ logic-colloquium-88 |
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62 |
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| Author |
Böhm, Corrado; Tronci, Enrico |
| Title |
X-Separability and Left-Invertibility in lambda-calculus |
Type |
Conference Article |
| Year |
1987 |
Publication |
Symposium on Logic in Computer Science (LICS) |
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Pages |
320-328 |
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IEEE Computer Society |
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Ithaca, New York, USA |
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yes |
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Sapienza @ mari @ lics87 |
Serial |
63 |
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| Author |
Böhm, Corrado; Tronci, Enrico |
| Title |
X-separability and left-invertibility in the λ-calculus (extended abstract, invited paper) |
Type |
Conference Article |
| Year |
1987 |
Publication |
Proceedings of: Temi e prospettive della Logica e della Filosofia della Scienza contemporanea |
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Place of Publication |
Cesena - Italy |
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yes |
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Sapienza @ mari @ cesena87 |
Serial |
64 |
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| Author |
Tronci, Enrico |
| Title |
On Computing Optimal Controllers for Finite State Systems |
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Conference Article |
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1997 |
Publication |
CDC '97: Proceedings of the 36th IEEE International Conference on Decision and Control |
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IEEE Computer Society |
Place of Publication |
Washington, DC, USA |
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yes |
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Sapienza @ mari @ cdc97 |
Serial |
66 |
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| Author |
Tronci, Enrico |
| Title |
Optimal Finite State Supervisory Control |
Type |
Conference Article |
| Year |
1996 |
Publication |
CDC '96: Proceedings of the 35th IEEE International Conference on Decision and Control |
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Supervisory Controllers are Discrete Event Dynamic Systems (DEDSs) forming the discrete core of a Hybrid Control System. We address the problem of automatic synthesis of Optimal Finite State Supervisory Controllers (OSCs). We show that Boolean First Order Logic (BFOL) and Binary Decision Diagrams (BDDs) are an effective methodological and practical framework for Optimal Finite State Supervisory Control. Using BFOL programs (i.e. systems of boolean functional equations) and BDDs we give a symbolic (i.e. BDD based) algorithm for automatic synthesis of OSCs. Our OSC synthesis algorithm can handle arbitrary sets of final states as well as plant transition relations containing loops and uncontrollable events (e.g. failures). We report on experimental results on the use of our OSC synthesis algorithm to synthesize a C program implementing a minimum fuel OSC for two autonomous vehicles moving on a 4 x 4 grid. |
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IEEE Computer Society |
Place of Publication |
Washington, DC, USA |
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yes |
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Sapienza @ mari @ cdc96 |
Serial |
67 |
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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) |
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536-542 |
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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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IEEE Computer Society |
Place of Publication |
Washington, DC, USA |
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0-7695-2504-0-01 |
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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 |
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Conference Article |
| Year |
2007 |
Publication |
APSEC '07: Proceedings of the 14th Asia-Pacific Software Engineering Conference |
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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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Approved |
yes |
| Call Number |
Sapienza @ mari @ Bmtd07 |
Serial |
76 |
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| Author |
Della Penna, Giuseppe; Magazzeni, Daniele; Tofani, Alberto; Intrigila, Benedetto; Melatti, Igor; Tronci, Enrico |
| Title |
Automatic Synthesis of Robust Numerical Controllers |
Type |
Conference Article |
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2007 |
Publication |
Icas '07 |
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4 |
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A major problem of numerical controllers is their robustness, i.e. the state read from the plant may not be in the controller table, although it may be close to some states in the table. For continuous systems, this problem is typically handled by interpolation techniques. Unfortunately, when the plant contains both continuous and discrete variables, the interpolation approach does not work well. To cope with this kind of systems, we propose a general methodology that exploits explicit model checking in an innovative way to automatically synthesize a (time-) optimal numerical controller from a plant specification and apply an optimized strengthening algorithm only on the most significant states, in order to reach an acceptable robustness degree. We implemented all the algorithms within our CGMurphi tool, an extension of the well-known CMurphi verifier, and tested the effectiveness of our approach by applying it to the well-known truck and trailer obstacles avoidance problem. |
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IEEE Computer Society |
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0-7695-2859-5 |
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Approved |
yes |
| Call Number |
Sapienza @ mari @ Dmtimt07 |
Serial |
89 |
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