Communication as unification in process algebras: Operational semantics

This paper introduces new-HOPLA, a concise but powerful language for higher-order nondeterministic processes with name generation. Its origins as a metalanguage for domain theory are sketched but for the most part the paper concentrates on its operational semantics. The language is typed, the type of a process describing the shape of the computation paths it can perform. Its transition semantics, bisimulation, congruence properties and expressive power are explored. Encodings are given of well-known process algebras, including pi-calculus, Higher-Order pi-calculus and Mobile Ambients.

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From CML to process Algebras

DAIMI Report Series ◽

10.7146/dpb.v22i433.6750 ◽

1993 ◽

Vol 22 (433) ◽

Cited By ~ 2

Author(s):

Flemming Nielson ◽

Hanne Riis Nielson

Keyword(s):

Programming Languages ◽

Programming Language ◽

Process Algebra ◽

Operational Semantics ◽

Concurrent Programming ◽

Process Algebras ◽

Standard Ml ◽

Concurrent Programming Languages ◽

Structural Operational Semantics ◽

Communication Behaviours

Reppy's language CML extends Standard ML of Milner et al. with primitives for communication. It thus inherits a notion of strong polymorphic typing and may be equipped with a structural operational semantics. We formulate an effect system for statically expressing the communication behaviours of CML programs as these are not otherwise reflected in the types.We then show how types and behaviours evolve in the course of computation: types may decrease and behaviours may loose alternatives as well as decrease. It will turn out that the syntax of behaviours is rather similar to that of a process algebra; our main results may therefore be viewed as regarding the semantics of a process algebra as an abstraction of the semantics of an underlying programming language. This establishes a new kind of connection between ''realistic'' concurrent programming languages and ''theoretical'' process algebras.

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Mind Operational Semantics and Brain Operational Architectonics: A Putative Correspondence

The Open Neuroimaging Journal ◽

10.2174/1874440001004010053 ◽

2010 ◽

Vol 4 (1) ◽

pp. 53-69

Author(s):

Giulio Benedetti

Keyword(s):

Operational Semantics

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Specifying and Executing User Agents in an Environment of Reasoning and RESTful Systems Using the Guard-Stage-Milestone Approach

Journal on Data Semantics ◽

10.1007/s13740-021-00123-0 ◽

2021 ◽

Author(s):

Tobias Käfer ◽

Benjamin Jochum ◽

Nico Aßfalg ◽

Leonard Nürnberg

Keyword(s):

Linked Data ◽

Operational Semantics ◽

Workflow Management ◽

Management Systems ◽

Workflow Management Systems ◽

The Web

AbstractFor Read-Write Linked Data, an environment of reasoning and RESTful interaction, we investigate the use of the Guard-Stage-Milestone approach for specifying and executing user agents. We present an ontology to specify user agents. Moreover, we give operational semantics to the ontology in a rule language that allows for executing user agents on Read-Write Linked Data. We evaluate our approach formally and regarding performance. Our work shows that despite different assumptions of this environment in contrast to the traditional environment of workflow management systems, the Guard-Stage-Milestone approach can be transferred and successfully applied on the web of Read-Write Linked Data.

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Persistent Stochastic Non-Interference

Fundamenta Informaticae ◽

10.3233/fi-2021-2049 ◽

2021 ◽

Vol 181 (1) ◽

pp. 1-35

Author(s):

Jane Hillston ◽

Andrea Marin ◽

Carla Piazza ◽

Sabina Rossi

Keyword(s):

Process Algebra ◽

Operational Semantics ◽

Evaluation Process ◽

Decision Algorithm ◽

Secure Systems ◽

Information Flow Security ◽

Structural Operational Semantics ◽

Timing Properties ◽

Functional Point ◽

Security Property

In this paper, we study an information flow security property for systems specified as terms of a quantitative Markovian process algebra, namely the Performance Evaluation Process Algebra (PEPA). We propose a quantitative extension of the Non-Interference property used to secure systems from the functional point view by assuming that the observers are able to measure also the timing properties of the system, e.g., the response time of certain actions or its throughput. We introduce the notion of Persistent Stochastic Non-Interference (PSNI) based on the idea that every state reachable by a process satisfies a basic Stochastic Non-Interference (SNI) property. The structural operational semantics of PEPA allows us to give two characterizations of PSNI: one based on a bisimulation-like equivalence relation inducing a lumping on the underlying Markov chain, and another one based on unwinding conditions which demand properties of individual actions. These two different characterizations naturally lead to efficient methods for the verification and construction of secure systems. A decision algorithm for PSNI is presented and an application of PSNI to a queueing system is discussed.

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Dynamic game semantics

Mathematical Structures in Computer Science ◽

10.1017/s0960129520000250 ◽

2020 ◽

pp. 1-60

Author(s):

Norihiro Yamada ◽

Samson Abramsky

Keyword(s):

Programming Languages ◽

Functional Programming ◽

Operational Semantics ◽

Dynamic Game ◽

Standard Interpretation ◽

Functional Programming Languages ◽

Game Semantics ◽

Wide Range ◽

Cartesian Closed Categories ◽

Cartesian Closed

Abstract The present work achieves a mathematical, in particular syntax-independent, formulation of dynamics and intensionality of computation in terms of games and strategies. Specifically, we give game semantics of a higher-order programming language that distinguishes programmes with the same value yet different algorithms (or intensionality) and the hiding operation on strategies that precisely corresponds to the (small-step) operational semantics (or dynamics) of the language. Categorically, our games and strategies give rise to a cartesian closed bicategory, and our game semantics forms an instance of a bicategorical generalisation of the standard interpretation of functional programming languages in cartesian closed categories. This work is intended to be a step towards a mathematical foundation of intensional and dynamic aspects of logic and computation; it should be applicable to a wide range of logics and computations.

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