Eike Best – författare

Petri nets model concurrent and distributed systems where active components communicate through the production and absorption of various kinds of resources. Although the dynamic properties of such systems may be very complex, they may sometimes be connected to the static structure of a Petri net. Many properties are decidable, but their complexity may be huge. It is often opportune to restrict oneself to classes of systems, to partial algorithms, and to similar but simpler properties. Instead of analysing a given system, it is also possible to search for a system satisfying some desired properties by construction. This comprehensive textbook/reference presents and discusses these issues in-depth in the context of one of the most fundamental Petri net models, called place/transition nets. The presentation is fortified by means of many examples and worked exercises. Among topics addressed: • In which order may actions may be generated and scheduled? • What states and configurations may be reached in a concurrent system? • Which interesting classes of systems can be analysed relatively efficiently? • Is it possible to synthesise a system of some class from its behaviour? • How can systems be represented algebraically, compositionally, and concisely? This unique text, based on introductory as well as on advanced courses on distributed systems, will serve as an invaluable guide for students and (future) researchers interested in theoretical—as well as in practical—aspects of Petri nets and related system models. Eike Best has been a full professor (now retired) affiliated to Carl von Ossietzky Universität Oldenburg, Germany. Raymond Devillers has been a full professor (now retired) affiliated to Université Libre de Bruxelles, Belgium. The authors have a long record as collaborators in the fields of Petri nets and the semantics of concurrency.

Petri nets model concurrent and distributed systems where active components communicate through the production and absorption of various kinds of resources. 

Although the dynamic properties of such systems may be very complex, they may sometimes be connected to the static structure of a Petri net. Many properties are decidable, but their complexity may be huge. It is often opportune to restrict oneself to classes of systems, to partial algorithms, and to similar but simpler properties. Instead of analysing a given system, it is also possible to search for a system satisfying some desired properties by construction. This comprehensive textbook/reference presents and discusses these issues in-depth in the context of one of the most fundamental Petri net models, called place/transition nets. The presentation is fortified by means of many examples and worked exercises. Among topics addressed: • In which order may actions may be generated and scheduled? • What states and configurations may be reached in a concurrent system? • Which interesting classes of systems can be analysed relatively efficiently? • Is it possible to synthesise a system of some class from its behaviour? • How can systems be represented algebraically, compositionally, and concisely? This unique text, based on introductory as well as on advanced courses on distributed systems, will serve as an invaluable guide for students and (future) researchers interested in theoretical—as well as in practical—aspects of Petri nets and related system models. Eike Best has been a full professor (now retired) affiliated to Carl von Ossietzky Universität Oldenburg, Germany. Raymond Devillers has been a full professor (now retired) affiliated to Université Libre de Bruxelles, Belgium. The authors have a long record as collaborators in the fields of Petri nets and the semantics of concurrency.

Petri nets model concurrent and distributed systems where active components communicate through the production and absorption of various kinds of resources. Although the dynamic properties of such systems may be very complex, they may sometimes be connected to the static structure of a Petri net. Many properties are decidable, but their complexity may be huge. It is often opportune to restrict oneself to classes of systems, to partial algorithms, and to similar but simpler properties. Instead of analysing a given system, it is also possible to search for a system satisfying some desired properties by construction. This comprehensive textbook/reference presents and discusses these issues in-depth in the context of one of the most fundamental Petri net models, called place/transition nets. The presentation is fortified by means of many examples and worked exercises. Among topics addressed: • In which order may actions may be generated and scheduled? • What states and configurations may be reached in a concurrent system? • Which interesting classes of systems can be analysed relatively efficiently? • Is it possible to synthesise a system of some class from its behaviour? • How can systems be represented algebraically, compositionally, and concisely? This unique text, based on introductory as well as on advanced courses on distributed systems, will serve as an invaluable guide for students and (future) researchers interested in theoretical—as well as in practical—aspects of Petri nets and related system models. Eike Best has been a full professor (now retired) affiliated to Carl von Ossietzky Universität Oldenburg, Germany. Raymond Devillers has been a full professor (now retired) affiliated to Université Libre de Bruxelles, Belgium. The authors have a long record as collaborators in the fields of Petri nets and the semantics of concurrency.

This book constitutes the proceedings of the 38th International Conference on Application and Theory of Petri Nets and Concurrency, PETRI NETS 2017, held in Zaragoza, Spain, in June 2017. Petri Nets 2017 is co-located with the Application of Concurrency to System Design Conference, ACSD 2017.The 16 papers, 9 theory papers, 4 application papers, and 3 tool papers, with 1 short abstract and 3 extended abstracts of invited talks presented together in this volume were carefully reviewed and selected from 33 submissions. The focus of the conference is on following topics: Simulation of Colored Petri Nets, Petri Net Tools.- Model Checking,  Liveness and Opacity,  Stochastic Petri Nets,  Specific Net Classes, and  Petri Nets for Pathways.

Ich mochte mit zwei Behauptungen beginnen: Die formale Semantik gehOrt zu den wichtigen Themen der Informatik. Ein wichtiges Thema der Informatik ist die formale Semantik. Anhand dieser beiden Behauptungen mochte ich Ihnen, lieber Leser, den Gegenstand dieses Buches erkIaren: man sagt, daB die beiden Satze unterschiedliche Syntax, aber gleiche Semantik haben. Unter der Syntax eines Satzes versteht man seinen auBeren Aufbau, zum Beispiel als Folge Subjekt­ Pradikat-Objekt. Vom rein satzbautechnischen Standpunkt aus besteht etwa zwischen den beiden Satzen: Die formale Semantik ist ein Thema der Informatik. Das neue Buch begleitet eine Vorlesung des Studiengangs. 1 kein wesentlicher Unterschied. Der Inhalt, die Bedeutung oder eben die Semantik eines Satzes umfaBt die Bedeutung der Worter, aus denen er besteht. Sie ist jedoch mehr als nur deren Summe. In der Tat gehen zeitliche (z.B.: formal bedeutet heutzutage etwas anderes als vor 1000 Jahren), kontextuelle (z.B.: die Phrase Das neue Buch ist nur aus dem textuellen Zusammenhang heraus zu verstehen) und andere Aspekte, eventuell auch subjektive, in die Semantik eines Satzes ein. Die ''untersuchbare'' Bedeutung ist daher stets eine Abstraktion vieler verschiedener Facetten ihrer Gesamtheit. Bei sehr genauer Untersuchung zeigen sich sogar zwischen den beiden Satzen zu Beginn dieser Uberlegungen unterschiedliche semantische Nuancen. Der erste legt starker als der zweite die Idee nahe, daB es eine wohldefinierte Menge von wichtigen Themen der Informatik gibt. Nur wenn Von diesem Unterschied abstrahiert wird, sind die Bedeutungen der beiden Satze gleich.

Ich mochte mit zwei Behauptungen beginnen: Die formale Semantik gehOrt zu den wichtigen Themen der Informatik. Ein wichtiges Thema der Informatik ist die formale Semantik. Anhand dieser beiden Behauptungen mochte ich Ihnen, lieber Leser, den Gegenstand dieses Buches erkIaren: man sagt, daB die beiden Satze unterschiedliche Syntax, aber gleiche Semantik haben. Unter der Syntax eines Satzes versteht man seinen auBeren Aufbau, zum Beispiel als Folge Subjekt­ Pradikat-Objekt. Vom rein satzbautechnischen Standpunkt aus besteht etwa zwischen den beiden Satzen: Die formale Semantik ist ein Thema der Informatik. Das neue Buch begleitet eine Vorlesung des Studiengangs. 1 kein wesentlicher Unterschied. Der Inhalt, die Bedeutung oder eben die Semantik eines Satzes umfaBt die Bedeutung der Worter, aus denen er besteht. Sie ist jedoch mehr als nur deren Summe. In der Tat gehen zeitliche (z.B.: formal bedeutet heutzutage etwas anderes als vor 1000 Jahren), kontextuelle (z.B.: die Phrase Das neue Buch ist nur aus dem textuellen Zusammenhang heraus zu verstehen) und andere Aspekte, eventuell auch subjektive, in die Semantik eines Satzes ein. Die 'untersuchbare' Bedeutung ist daher stets eine Abstraktion vieler verschiedener Facetten ihrer Gesamtheit. Bei sehr genauer Untersuchung zeigen sich sogar zwischen den beiden Satzen zu Beginn dieser Uberlegungen unterschiedliche semantische Nuancen. Der erste legt starker als der zweite die Idee nahe, daB es eine wohldefinierte Menge von wichtigen Themen der Informatik gibt. Nur wenn Von diesem Unterschied abstrahiert wird, sind die Bedeutungen der beiden Satze gleich.

The refereed proceedings of the 24th International Conference on Applications and Theory of Petri Nets, ICATPN 2003, held in Eindhoven, The Netherlands, in June 2003. The 25 revised full papers presented together with 6 invited contributions were carefully reviewed and selected from 77 submissions. All current issues on research and development in the area of Petri nets are addressed, in particular concurrent systems design and analysis, model checking, networking, business process modeling, formal methods in software engineering, agent systems, systems specification, systems validation, discrete event systems, protocols, and prototyping.

This volume contains the proceedings of CONCUR '93, thefourth in an annual series of conferences devoted to thestudy of concurrency. The basic aim of the CONCURconferences is to communicate advances in concurrency theoryand applications.The volume contains 31 papers selected from 113submissions,together with four invited papers and two abstracts ofinvited talks. The invited talks are: "The lambda-calculuswith multiplicities" (extended abstract) by G rard Boudol,"A pi-calculus semantics for an object-based designnotation" by Cliff B. Jones, "Partial-order methods fortemporal verification" by Pierre Wolper and PatriceGodefroid, "Non-interleaving process algebra" by Jos C.M.Baetenand Jan A. Bergstra, "Loop parallelization in thepolytope model" by Christian Lengauer, and "Structuredoperational semantics for process algebras and equationalaxiom systems" (abstract) by Bard Bloom.

In modern society services and support provided by computer-based systems have become ubiquitous and indeed have started to fund amentally alter the way people conduct their business. Moreover, it has become apparent that among the great variety of computer technologies available to potential users a crucial role will be played by concurrent systems. The reason is that many commonly occurring phenomena and computer applications are highly con­ current : typical examples include control systems, computer networks, digital hardware, business computing, and multimedia systems. Such systems are characterised by ever increasing complexity, which results when large num­ bers of concurrently active components interact. This has been recognised and addressed within the computing science community. In particular, sev­ eral form al models of concurrent systems have been proposed, studied, and applied in practice. This book brings together two of the most widely used formalisms for de­ scribing and analysing concurrent systems: Petri nets and process algebras. On the one hand , process algebras allow one to specify and reason about the design of complex concurrent computing systems by means of algebraic operators corresponding to common programming constructs. Petri nets, on the other hand, provide a graphical representation of such systems and an additional means of verifying their correctness efficiently, as well as a way of expressing properties related to causality and concurrency in system be­ haviour.

In modern society services and support provided by computer-based systems have become ubiquitous and indeed have started to fund amentally alter the way people conduct their business. Moreover, it has become apparent that among the great variety of computer technologies available to potential users a crucial role will be played by concurrent systems. The reason is that many commonly occurring phenomena and computer applications are highly con­ current : typical examples include control systems, computer networks, digital hardware, business computing, and multimedia systems. Such systems are characterised by ever increasing complexity, which results when large num­ bers of concurrently active components interact. This has been recognised and addressed within the computing science community. In particular, sev­ eral form al models of concurrent systems have been proposed, studied, and applied in practice. This book brings together two of the most widely used formalisms for de­ scribing and analysing concurrent systems: Petri nets and process algebras. On the one hand , process algebras allow one to specify and reason about the design of complex concurrent computing systems by means of algebraic operators corresponding to common programming constructs. Petri nets, on the other hand, provide a graphical representation of such systems and an additional means of verifying their correctness efficiently, as well as a way of expressing properties related to causality and concurrency in system be­ haviour.

The theory of Petri nets is a part of computer science whose importance is increasingly acknowledged. Many papers and anthologies, whose subject matter is net theory and its applications, have appeared to date. There exist at least seven introductory textbooks on the theory. The present monograph augments this literature by offering a mathematical treatment of one of the central aspects of net theory: the modelling of concur­ rency by partially ordered sets. Occurrence nets - which are special nets as well as special partial orders - are proposed by net theory for this purpose. We study both the general properties of occurrence nets and their use in describing the concurrent behaviour of systems. Occurrence nets may be contrasted with a more language-oriented approach to the modelling of concurrency known as arbitrary interleaving. We will dis­ cuss some connections between these'' two approaches. Other approaches based on partially ordered sets - such as the theory of traces, the theory of event structures and the theory of semi words - are not considered in this book, in spite of the strong links between them and net theory.

The theory of Petri nets is a part of computer science whose importance is increasingly acknowledged. Many papers and anthologies, whose subject matter is net theory and its applications, have appeared to date. There exist at least seven introductory textbooks on the theory. The present monograph augments this literature by offering a mathematical treatment of one of the central aspects of net theory: the modelling of concur­ rency by partially ordered sets. Occurrence nets - which are special nets as well as special partial orders - are proposed by net theory for this purpose. We study both the general properties of occurrence nets and their use in describing the concurrent behaviour of systems. Occurrence nets may be contrasted with a more language-oriented approach to the modelling of concurrency known as arbitrary interleaving. We will dis­ cuss some connections between these' two approaches. Other approaches based on partially ordered sets - such as the theory of traces, the theory of event structures and the theory of semi words - are not considered in this book, in spite of the strong links between them and net theory.