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Search Results: 1 - 10 of 253 matches for " Achille Frigeri "
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Circular planar nearrings: geometrical and combinatorial aspects
Anna Benini,Achille Frigeri,Fiorenza Morini
Mathematics , 2010,
Abstract: Let $(N,\Phi)$ be a circular Ferrero pair. We define the disk with center $b$ and radius $a$, $\mathcal{D}(a;b)$, as \[\mathcal{D}(a;b)=\{x\in \Phi(r)+c\mid r\neq 0,\ b\in \Phi(r)+c,\ |(\Phi(r)+c)\cap (\Phi(a)+b)|=1\}.\] We prove that in the field-generated case there are many analogies with the Euclidean geometry. Moreover, if $\mathcal{B}^{\mathcal{D}}$ is the set of all disks, then, in some interesting cases, we show that the incidence structure $(N,\mathcal{B}^{\mathcal{D}},\in)$ is actually a balanced incomplete block design.
Fuzzy Time in LTL
Achille Frigeri,Liliana Pasquale,Paola Spoletini
Computer Science , 2012,
Abstract: In the last years, the adoption of active systems has increased in many fields of computer science, such as databases, sensor networks, and software engineering. These systems are able to automatically react to events, by collecting information from outside and internally generating new events. However, the collection of data is often hampered by uncertainty and vagueness that can arise from the imprecision of the monitoring infrastructure, unreliable data sources, and networks. The decision making mechanism used to produce a reaction is also imprecise, and cannot be evaluated in a crisp way. It depends on the evaluation of vague temporal constraints, which are expressed on the collected data by humans. Despite fuzzy logic has been mainly conceived as a mathematical abstraction to express vagueness, no attempt has been made to fuzzify the temporal modalities. Existing fuzzy languages do not allow us to represent temporal properties, such as "almost always" and "soon". Indeed, the semantics of existing fuzzy temporal operators is based on the idea of replacing classical connectives or propositions with their fuzzy counterparts. To overcome these limitations, we propose a temporal framework, FTL (Fuzzy-time Temporal Logic), to express vagueness on time. This framework formally defines a set of fuzzy temporal modalities, which can be customized by choosing a specific semantics for the connectives. The semantics of the language is sound, and the introduced modalities respect a set of expected mutual relations. We also prove that under the assumption that all events are crisp, FTL reduces to LTL. Finally, for some of the possible fuzzy interpretations of the connectives, we identify adequate sets of temporal operators, from which it is possible to derive all the others.
Composing short 3-compressing words on a 2 letter alphabet
Alessandra Cherubini,Achille Frigeri,Zuhua Liu
Computer Science , 2014,
Abstract: A finite deterministic (semi)automaton $\mathcal{A} =(Q,\Sigma,\delta)$ is $k$-compressible if there is some word $w\in \Sigma^+$ such that the image of its state set $Q$ under the natural action of $w$ is reduced by at least $k$ states. Such word, if it exists, is called a $k$-compressing word for $\mathcal{A}$. A word is $k$-collapsing if it is $k$-compressing for each $k$-compressible automaton. We compute a set $W$ of short words such that each $3$-compressible automata on a two letter alphabet is $3$-compressed at least by a word in $W$. Then we construct a shortest common superstring of the words in $W$ and, with a further refinement, we obtain a $3$-collapsing word of length $53$. Moreover, as previously announced, we show that the shortest $3$-synchronizing word is not $3$-collapsing, illustrating the new bounds $34\leq c(2,3)\leq 53$ for the length $c(2,3)$ of the shortest $3$-collapsing word on a two letter alphabet.
Constraint LTL Satisfiability Checking without Automata
Marcello M. Bersani,Achille Frigeri,Angelo Morzenti,Matteo Pradella,Matteo Rossi,Pierluigi San Pietro
Computer Science , 2012,
Abstract: This paper introduces a novel technique to decide the satisfiability of formulae written in the language of Linear Temporal Logic with Both future and past operators and atomic formulae belonging to constraint system D (CLTLB(D) for short). The technique is based on the concept of bounded satisfiability, and hinges on an encoding of CLTLB(D) formulae into QF-EUD, the theory of quantifier-free equality and uninterpreted functions combined with D. Similarly to standard LTL, where bounded model-checking and SAT-solvers can be used as an alternative to automata-theoretic approaches to model-checking, our approach allows users to solve the satisfiability problem for CLTLB(D) formulae through SMT-solving techniques, rather than by checking the emptiness of the language of a suitable automaton A_{\phi}. The technique is effective, and it has been implemented in our Zot formal verification tool.
SMT-based Verification of LTL Specifications with Integer Constraints and its Application to Runtime Checking of Service Substitutability
Marcello M. Bersani,Luca Cavallaro,Achille Frigeri,Matteo Pradella,Matteo Rossi
Computer Science , 2010,
Abstract: An important problem that arises during the execution of service-based applications concerns the ability to determine whether a running service can be substituted with one with a different interface, for example if the former is no longer available. Standard Bounded Model Checking techniques can be used to perform this check, but they must be able to provide answers very quickly, lest the check hampers the operativeness of the application, instead of aiding it. The problem becomes even more complex when conversational services are considered, i.e., services that expose operations that have Input/Output data dependencies among them. In this paper we introduce a formal verification technique for an extension of Linear Temporal Logic that allows users to include in formulae constraints on integer variables. This technique applied to the substitutability problem for conversational services is shown to be considerably faster and with smaller memory footprint than existing ones.
Bounded Reachability for Temporal Logic over Constraint Systems
Marcello M. Bersani,Achille Frigeri,Angelo Morzenti,Matteo Pradella,Matteo Rossi,Pierluigi San Pietro
Computer Science , 2010,
Abstract: We present CLTLB(D), an extension of PLTLB (PLTL with both past and future operators) augmented with atomic formulae built over a constraint system D. Even for decidable constraint systems, satisfiability and Model Checking problem of such logic can be undecidable. We introduce suitable restrictions and assumptions that are shown to make the satisfiability problem for the extended logic decidable. Moreover for a large class of constraint systems we propose an encoding that realize an effective decision procedure for the Bounded Reachability problem.
Global existence of weak solutions for a nonlocal model for two-phase flows of incompressible fluids with unmatched densities
Sergio Frigeri
Mathematics , 2015,
Abstract: We consider a diffuse interface model for an incompressible isothermal mixture of two viscous Newtonian fluids with different densities in a bounded domain in two or three space dimensions. The model is the nonlocal version of the one recently derived by Abels, Garcke and Gr\"{u}n and consists in a Navier-Stokes type system coupled with a convective nonlocal Cahn-Hilliard equation. The density of the mixture depends on an order parameter. For this nonlocal system we prove existence of global dissipative weak solutions for the case of singular double-well potentials and non degenerate mobilities. To this goal we devise an approach which is completely independent of the one employed by Abels, Depner and Garcke to establish existence of weak solutions for the local Abels et al. model.
Visualizzazione stereoscopica collaborativa di geodati tridimensionali con software libero
Alessandro Frigeri,Costanzo Federico
GEOmedia , 2012,
Abstract: La visualizzazione dell'informazione sussiste da quando esiste l'informazione stessa e nasce dalla necessità sia dicomprendere meglio particolari aspetti di un insieme di dati, sia di comunicarli. Collaborative three-dimensional stereoscopic visualization of geodata with free software Geodata are inherently three-dimensional, when referred to heights and depths. This article describes the development and applications of a interactive and collaborative stereoscopic visualization system built by off-the-shelf hardware and focusing on the use of a completely free open source software stack, from the operative system to the graphics drivers and the users space applications.
Global and trajectory attractors for a nonlocal Cahn-Hilliard-Navier-Stokes system
Sergio Frigeri,Maurizio Grasselli
Mathematics , 2011, DOI: 10.1007/s10884-012-9272-3
Abstract: The Cahn-Hilliard-Navier-Stokes system is based on a well-known diffuse interface model and describes the evolution of an incompressible isothermal mixture of binary fluids. A nonlocal variant consists of the Navier-Stokes equations suitably coupled with a nonlocal Cahn-Hilliard equation. The authors, jointly with P. Colli, have already proven the existence of a global weak solution to a nonlocal Cahn-Hilliard-Navier-Stokes system subject to no-slip and no-flux boundary conditions. Uniqueness is still an open issue even in dimension two. However, in this case, the energy identity holds. This property is exploited here to define, following J.M. Ball's approach, a generalized semiflow which has a global attractor. Through a similar argument, we can also show the existence of a (connected) global attractor for the convective nonlocal Cahn-Hilliard equation with a given velocity field, even in dimension three. Finally, we demonstrate that any weak solution fulfilling the energy inequality also satisfies an energy inequality. This allows us to establish the existence of the trajectory attractor also in dimension three with a time dependent external force.
Trajectory attractors for the Sun-Liu model for nematic liquid crystals in 3D
Sergio Frigeri,Elisabetta Rocca
Mathematics , 2012, DOI: 10.1088/0951-7715/26/4/933
Abstract: In this paper we prove the existence of a trajectory attractor (in the sense of V.V. Chepyzhov and M.I. Vishik) for a nonlinear PDE system coming from a 3D liquid crystal model accounting for stretching effects. The system couples a nonlinear evolution equation for the director d (introduced in order to describe the preferred orientation of the molecules) with an incompressible Navier-Stokes equation for the evolution of the velocity field u. The technique is based on the introduction of a suitable trajectory space and of a metric accounting for the double-well type nonlinearity contained in the director equation. Finally, a dissipative estimate is obtained by using a proper integrated energy inequality. Both the cases of (homogeneous) Neumann and (non-homogeneous) Dirichlet boundary conditions for d are considered.
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