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  • Team bisimilarity, and its associated modal logic, for BPP nets
    Acta Inform. (IF 1.042) Pub Date : 2020-03-13
    Roberto Gorrieri

    Abstract BPP nets, a subclass of finite Place/Transition Petri nets, are equipped with an efficiently decidable, truly concurrent, bisimulation-based, behavioral equivalence, called team bisimilarity. This equivalence is a very intuitive extension of classic bisimulation equivalence (over labeled transition systems) to BPP nets and it is checked in a distributed manner, without necessarily building

    更新日期:2020-03-16
  • Safety synthesis for incrementally stable switched systems using discretization-free multi-resolution abstractions
    Acta Inform. (IF 1.042) Pub Date : 2019-09-13
    Antoine Girard, Gregor Gössler

    Abstract Control of continuous and hybrid systems using discrete abstractions often suffers from scalability issues, due to the use of state space partitions as symbolic states. In this paper, for incrementally stable switched systems, we introduce a class of abstractions that do not rely on state space partitions but use mode sequences as symbolic states. Our approach differs from existing works by

    更新日期:2020-03-06
  • Programming by predicates: a formal model for interactive synthesis
    Acta Inform. (IF 1.042) Pub Date : 2019-08-30
    Hila Peleg, Shachar Itzhaky, Sharon Shoham, Eran Yahav

    Abstract Program synthesis is the problem of computing from a specification a program that implements it. New and popular variations on the synthesis problem accept specifications in formats that are easier for the human synthesis user to provide: input–output example pairs, type information, and partial logical specifications. These are all partial specification formats, encoding only a fraction of

    更新日期:2020-03-06
  • Indecision and delays are the parents of failure—taming them algorithmically by synthesizing delay-resilient control
    Acta Inform. (IF 1.042) Pub Date : 2020-02-20
    Mingshuai Chen, Martin Fränzle, Yangjia Li, Peter N. Mosaad, Naijun Zhan

    Abstract The possible interactions between a controller and its environment can naturally be modelled as the arena of a two-player game, and adding an appropriate winning condition permits to specify desirable behavior. The classical model here is the positional game, where both players can (fully or partially) observe the current position in the game graph, which in turn is indicative of their mutual

    更新日期:2020-02-20
  • Complement for two-way alternating automata
    Acta Inform. (IF 1.042) Pub Date : 2020-02-17
    Viliam Geffert, Christos A. Kapoutsis, Mohammad Zakzok

    Abstract We consider the problem of converting a two-way alternating finite automaton (2AFA) with n states to a 2AFA accepting the complement of its language. Complementing is trivial for halting2AFAs, by swapping the roles of existential and universal decisions and the roles of accepting and rejecting states. However, since 2AFAs do not have resources to detect infinite loops by counting executed

    更新日期:2020-02-18
  • Watson–Crick quantum finite automata
    Acta Inform. (IF 1.042) Pub Date : 2020-02-10
    Debayan Ganguly, Kingshuk Chatterjee, Kumar Sankar Ray

    Abstract One-way quantum finite automata are reversible in nature, which greatly reduces its accepting property. In fact, the set of languages accepted by one-way quantum finite automata is a proper subset of regular languages. In this paper, we replace the tape head of one-way quantum finite automata with DNA double strand and name the model Watson–Crick quantum finite automata. The non-injective

    更新日期:2020-02-10
  • A deterministic parsing algorithm for ambiguous regular expressions
    Acta Inform. (IF 1.042) Pub Date : 2020-02-04
    Angelo Borsotti, Luca Breveglieri, Stefano Crespi Reghizzi, Angelo Morzenti

    Abstract We introduce a new parser generator, called Berry–Sethi Parser (BSP), for ambiguous regular expressions (RE). The generator constructs a deterministic finite-state transducer that recognizes an input string, as the classical Berry–Sethi algorithm does, and additionally outputs a linear representation of all the syntax trees of the string; for infinitely ambiguous strings, a policy for selecting

    更新日期:2020-02-04
  • Arithmetical datatypes with true fractions
    Acta Inform. (IF 1.042) Pub Date : 2020-01-13
    Jan A. Bergstra, Alban Ponse

    Abstract We consider several novel congruences on the signature of meadows with the aim to survey different notions of fractions. In particular we suggest a notion of “true fraction”.

    更新日期:2020-01-13
  • Parameterized synthesis of self-stabilizing protocols in symmetric networks
    Acta Inform. (IF 1.042) Pub Date : 2019-12-20
    Nahal Mirzaie, Fathiyeh Faghih, Swen Jacobs, Borzoo Bonakdarpour

    Self-stabilization in distributed systems is a technique to guarantee convergence to a set of legitimate states without external intervention when a transient fault or bad initialization occurs. Recently, there has been a surge of efforts in designing techniques for automated synthesis of self-stabilizing algorithms that are correct by construction. Most of these techniques, however, are not parameterized

    更新日期:2020-01-04
  • Linear-bounded composition of tree-walking tree transducers: linear size increase and complexity
    Acta Inform. (IF 1.042) Pub Date : 2019-12-09
    Joost Engelfriet, Kazuhiro Inaba, Sebastian Maneth

    Abstract Compositions of tree-walking tree transducers form a hierarchy with respect to the number of transducers in the composition. As main technical result it is proved that any such composition can be realized as a linear-bounded composition, which means that the sizes of the intermediate results can be chosen to be at most linear in the size of the output tree. This has consequences for the expressiveness

    更新日期:2020-01-04
  • Synthesis from hyperproperties
    Acta Inform. (IF 1.042) Pub Date : 2019-12-07
    Bernd Finkbeiner, Christopher Hahn, Philip Lukert, Marvin Stenger, Leander Tentrup

    Abstract We study the reactive synthesis problem for hyperproperties given as formulas of the temporal logic HyperLTL. Hyperproperties generalize trace properties, i.e., sets of traces, to sets of sets of traces. Typical examples are information-flow policies like noninterference, which stipulate that no sensitive data must leak into the public domain. Such properties cannot be expressed in standard

    更新日期:2020-01-04
  • Automated formal synthesis of provably safe digital controllers for continuous plants
    Acta Inform. (IF 1.042) Pub Date : 2019-12-06
    Alessandro Abate, Iury Bessa, Lucas Cordeiro, Cristina David, Pascal Kesseli, Daniel Kroening, Elizabeth Polgreen

    We present a sound and automated approach to synthesizing safe, digital controllers for physical plants represented as time-invariant models. Models are linear differential equations with inputs, evolving over a continuous state space. The synthesis precisely accounts for the effects of finite-precision arithmetic introduced by the controller. The approach uses counterexample-guided inductive synthesis:

    更新日期:2020-01-04
  • Transducer degrees: atoms, infima and suprema
    Acta Inform. (IF 1.042) Pub Date : 2019-12-05
    Jörg Endrullis, Jan Willem Klop, Rena Bakhshi

    Abstract Although finite state transducers are very natural and simple devices, surprisingly little is known about the transducibility relation they induce on streams (infinite words). We collect some intriguing problems that have been unsolved since several years. The transducibility relation arising from finite state transduction induces a partial order of stream degrees, which we call Transducer

    更新日期:2020-01-04
  • Performance heuristics for GR(1) synthesis and related algorithms
    Acta Inform. (IF 1.042) Pub Date : 2019-12-05
    Elizabeth Firman, Shahar Maoz, Jan Oliver Ringert

    Reactive synthesis for the GR(1) fragment of LTL has been implemented and studied in many works. In this work we present and evaluate a list of heuristics to potentially reduce running times for GR(1) synthesis and related algorithms. The list includes several heuristics for controlled predecessor computation and BDDs, early detection of fixed-points and unrealizability, fixed-point recycling, and

    更新日期:2020-01-04
  • A formal methods approach to predicting new features of the eukaryotic vesicle traffic system
    Acta Inform. (IF 1.042) Pub Date : 2019-12-02
    Arnab Bhattacharyya, Ashutosh Gupta, Lakshmanan Kuppusamy, Somya Mani, Ankit Shukla, Mandayam Srivas, Mukund Thattai

    Abstract Vesicle traffic systems (VTSs) transport cargo among the intracellular compartments of eukaryotic cells. The compartments are viewed as nodes that are labeled by their chemical identity and the transport vesicles are similarly viewed as labeled edges between the nodes. Several interesting questions about VTSs translate to combinatorial search and synthesis problems. We present novel encodings

    更新日期:2020-01-04
  • Congruence from the operator’s point of view
    Acta Inform. (IF 1.042) Pub Date : 2019-12-02
    Maciej Gazda, Wan Fokkink, Vittorio Massaro

    Abstract A basic sanity property of a process semantics is that it constitutes a congruence with respect to standard process operators. This issue has been traditionally addressed by developing, for a specific process semantics, a syntactic format for operational semantics specifications. We suggest a novel, orthogonal approach, which focuses on a specific process operator and determines a class of

    更新日期:2020-01-04
  • Coupled similarity: the first 32 years
    Acta Inform. (IF 1.042) Pub Date : 2019-11-28
    Benjamin Bisping, Uwe Nestmann, Kirstin Peters

    Abstract Coupled similarity is an equivalence on (labeled) transition systems; its distinguishing power lies between (weak) bisimilarity and (may) testing equivalence. Its main feature, compared to weak bisimilarity, is an additional \(\tau \)-law that abstracts from the atomicity of internal choices among several possible branches, thus allowing for gradual commitments. The need for this \(\tau \)-law

    更新日期:2020-01-04
  • Practical synthesis of reactive systems from LTL specifications via parity games
    Acta Inform. (IF 1.042) Pub Date : 2019-11-21
    Michael Luttenberger, Philipp J. Meyer, Salomon Sickert

    Abstract The synthesis of reactive systems from linear temporal logic (LTL) specifications is an important aspect in the design of reliable software and hardware. We present our adaption of the classic automata-theoretic approach to LTL synthesis, implemented in the tool Strix which has won the two last synthesis competitions (Syntcomp2018/2019). The presented approach is (1) structured, meaning that

    更新日期:2020-01-04
  • Reactive synthesis with maximum realizability of linear temporal logic specifications
    Acta Inform. (IF 1.042) Pub Date : 2019-11-09
    Rayna Dimitrova, Mahsa Ghasemi, Ufuk Topcu

    A challenging problem for autonomous systems is to synthesize a reactive controller that conforms to a set of given correctness properties. Linear temporal logic (LTL) provides a formal language to specify the desired behavioral properties of systems. In applications in which the specifications originate from various aspects of the system design, or consist of a large set of formulas, the overall system

    更新日期:2020-01-04
  • Static versus dynamic reversibility in CCS
    Acta Inform. (IF 1.042) Pub Date : 2019-11-07
    Ivan Lanese, Doriana Medić, Claudio Antares Mezzina

    The notion of reversible computing is attracting interest because of its applications in diverse fields, in particular the study of programming abstractions for fault tolerant systems. Most computational models are not naturally reversible since computation causes loss of information, and history information must be stored to enable reversibility. In the literature, two approaches to reverse the CCS

    更新日期:2020-01-04
  • Subsequence versus substring constraints in sequence pattern languages
    Acta Inform. (IF 1.042) Pub Date : 2019-11-07
    Steven Engels, Tony Tan, Jan Van den Bussche

    Abstract A family of logics for expressing patterns in sequences is investigated. The logics are all fragments of first-order logic, but they are variable-free. Instead, they can use substring and subsequence constraints as basic propositions. Propositions expressing constraints on the beginning or the end of the sequence are also available. Also wildcards can be used, which is important when the alphabet

    更新日期:2020-01-04
  • Reversible sessions with flexible choices
    Acta Inform. (IF 1.042) Pub Date : 2019-03-01
    Ilaria Castellani, Mariangiola Dezani-Ciancaglini, Paola Giannini

    Abstract We propose a calculus for concurrent reversible multiparty sessions, equipped with a flexible choice operator allowing for different sets of participants in each branch. This operator is inspired by the notion of connecting action recently introduced by Hu and Yoshida to describe protocols with optional participants. We argue that this choice operator allows for a natural description of typical

    更新日期:2020-01-04
  • Distributive laws for monotone specifications
    Acta Inform. (IF 1.042) Pub Date : 2019-02-22
    Jurriaan Rot

    Turi and Plotkin introduced an elegant approach to structural operational semantics based on universal coalgebra, parametric in the type of syntax and the type of behaviour. Their framework includes abstract GSOS, a categorical generalisation of the classical GSOS rule format, as well as its categorical dual, coGSOS. Both formats are well behaved, in the sense that each specification has a unique model

    更新日期:2020-01-04
  • Using contracted solution graphs for solving reconfiguration problems
    Acta Inform. (IF 1.042) Pub Date : 2019-05-31
    Paul Bonsma, Daniël Paulusma

    Abstract We introduce in a general setting a dynamic programming method for solving reconfiguration problems. Our method is based on contracted solution graphs, which are obtained from solution graphs by performing an appropriate series of edge contractions that decrease the graph size without losing any critical information needed to solve the reconfiguration problem under consideration. Our general

    更新日期:2020-01-04
  • Synthesizing optimally resilient controllers
    Acta Inform. (IF 1.042) Pub Date : 2019-10-31
    Daniel Neider, Alexander Weinert, Martin Zimmermann

    Recently, Dallal, Neider, and Tabuada studied a generalization of the classical game-theoretic model used in program synthesis, which additionally accounts for unmodeled intermittent disturbances. In this extended framework, one is interested in computing optimally resilient strategies, i.e., strategies that are resilient against as many disturbances as possible. Dallal, Neider, and Tabuada showed

    更新日期:2020-01-04
  • A symbolic algorithm for lazy synthesis of eager strategies
    Acta Inform. (IF 1.042) Pub Date : 2019-10-04
    Swen Jacobs, Mouhammad Sakr

    Abstract We present an algorithm for solving two-player safety games that combines a mixed forward/backward search strategy with a symbolic representation of the state space. By combining forward and backward exploration, our algorithm can synthesize strategies that are eager in the sense that they try to prevent progress towards the error states as soon as possible, whereas standard backwards algorithms

    更新日期:2020-01-04
  • Compositional schedulability analysis of real-time actor-based systems.
    Acta Inform. (IF 1.042) Pub Date : 2017-05-23
    Mohammad Mahdi Jaghoori,Frank de Boer,Delphine Longuet,Tom Chothia,Marjan Sirjani

    We present an extension of the actor model with real-time, including deadlines associated with messages, and explicit application-level scheduling policies, e.g.,"earliest deadline first" which can be associated with individual actors. Schedulability analysis in this setting amounts to checking whether, given a scheduling policy for each actor, every task is processed within its designated deadline

    更新日期:2019-11-01
  • Distributive laws for monotone specifications.
    Acta Inform. (IF 1.042) Pub Date : null
    Jurriaan Rot

    Turi and Plotkin introduced an elegant approach to structural operational semantics based on universal coalgebra, parametric in the type of syntax and the type of behaviour. Their framework includes abstract GSOS, a categorical generalisation of the classical GSOS rule format, as well as its categorical dual, coGSOS. Both formats are well behaved, in the sense that each specification has a unique model

    更新日期:2019-11-01
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