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Normative Positions in Multi-Agent Systems
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management. Department of Computer and Systems Sciences, University of Stockholm, Stockholm, Sweden. (Besluts-, risk- och policyanalys)
2016 (English)In: Web Intelligence, ISSN ISSN 2405-6456, EISSN 2405-6464, Vol. 14, no 2, 153-171 p.Article in journal (Refereed) Published
Abstract [en]

The Kanger-Lindahl theory of normative positions has great potential of serving as a logical foundation for normative systems for MAS, and its generality allows for great freedom when interpreting the theory. As a first step towards a typology of interpretations of the theory, we study the application of normative positions in the context of a class of transition systems in which transitions are deterministic and associated with a single agent performing an act. By an interpretation of different types of normative positions in terms of permitting or prohibiting different state transition types in this context, lexicons for two different systems of types of normative positions are suggested and discussed. It is demonstrated that both interpretations areuseful foundations for normative systems semantics in a MAS context.

Place, publisher, year, edition, pages
IOS Press, 2016. Vol. 14, no 2, 153-171 p.
Keyword [en]
Normative MAS, Norm-regulated, Norm-governed, Normative positions, Transition system
National Category
Computer Science
URN: urn:nbn:se:hig:diva-20191DOI: 10.3233/WEB-160337ScopusID: 2-s2.0-84969813512OAI: diva2:850681
The 2014 IEEE/WIC/ACM International Joint Conference on Web Intelligence (WI) and Intelligent Agent Technologies (IAT), 11–14 August 2014, Warsaw, Poland
Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2016-08-12Bibliographically approved
In thesis
1. Norm-Regulation of Agent Systems: Instrumentalizing an algebraic approach to agent system norms
Open this publication in new window or tab >>Norm-Regulation of Agent Systems: Instrumentalizing an algebraic approach to agent system norms
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An architecture for norm-regulated multi-agent systems based on an algebraic approach to normative systems is instrumentalized and further developed. The core of the instrumentalization is a Prolog module, which together with a Java library can be used for creating client/server-based runtime systems. Norms are represented as conditional sentences, whose normative consequences are formulated by applying normative operators to descriptive conditions. From such general normative conditions follow normative sentences regarding specific states of affairs. These in turn result in permission or prohibition of individual actions in specific situations. Furthermore, an approach to turning runtime systems into instruments for problem-solving by using evolutionary mechanisms for evolving normative systems, is presented. The construction of norm-creating operators on conditions, which forms the basis for the representation of normative systems, is approached from two angles. (i) A logical analysis based on the Kanger-Lindahl theory of normative positions is conducted. This results in two extended sets of types of normative positions, and based on an algebraic version of one of these extended systems, a set of operators for creating agent-specific norms is constructed. (ii) An alternative analysis, which takes as its starting point a systematic exploration of types of state transitions, yields a set of norm-creating operators based on prohibition of transition types. It is furthermore argued that in the context of a class of transition systems, in which transitions are deterministic and associated with a single agent performing an act, operators based on (ii) specify a meaningful semantics of operators based on (i). Theoretical results together with shared code and example applications contribute to make possible theoretically sound, transparently described, and efficiently implemented norm-regulated autonomous agent systems.

Abstract [sv]

En arkitektur för normreglerade multiagentsystem baserad på en algebraisk representation av normativa system instrumentaliseras och vidareutvecklas. Kärnan i instrumentaliseringen utgörs av en Prolog-modul som tillsammans med ett Java-bibliotek kan användas för att skapa client/server-baserad körbar kod. Normer representeras som ordnade par av grundvillkor och följdvillkor. De senare konstrueras genom att normativa operatorer appliceras på deskriptiva villkor. Från sådana generella normativa villkor följer normativa satser om specifika sakförhållanden, vilka i sin tur ger upphov till förbud mot eller tillåtelse att utföra enskilda handlingar i olika situationer. Vidare skisseras en metod för att göra körbara multiagentsystem till verktyg för problemlösning genom att använda evolutionära mekanismer för att odla fram normativa system. Konstruktionen av normskapande operatorer på villkor, vilka ligger till grund för representationen av normativa system, betraktas ur två olika synvinklar. (i) En logisk analys, baserad på Kanger-Lindahls teori om normativa positioner. Denna resulterar i två utökade uppsättningar av typer av normativa positioner och utgående från en algebraisk version av ett av dessa utökade system konstrueras sedan en uppsättning operatorer för att skapa agentspecifika normer. (ii) En alternativ analys, som tar sin utgångspunkt i en systematisk undersökning av olika typer av tillståndsövergångar. Denna ger upphov till en uppsättning av normskapande operatorer som är baserade på förbud mot olika typer av övergångar. Argument presenteras vidare för att inom ramen för en klass av övergångssystem, där övergångar är deterministiska och associerade med en agent som utför en handling, så specificerar operatorer baserade på (ii) en meningsfull semantik för operatorer baserade på (i). Teoretiska resultat tillsammans med tillgängliggjord programkod och exempel på tillämpningar bidrar till att underlätta skapandet av teoretiskt sunda, transparent beskrivna och effektivt implementerade normreglerade system av autonoma agenter.

Place, publisher, year, edition, pages
Stockholm: Department of Computer and Systems Sciences, Stockholm University, 2015. 64 p.
Report Series / Department of Computer & Systems Sciences, ISSN 1101-8526 ; 15-014
Agent System, Norm-regulated, Norm-governed, Normative MAS, Normative Positions, Normative system, Transition system
National Category
Computer Science
Research subject
Computer and Systems Sciences
urn:nbn:se:hig:diva-20425 (URN)978-91-7649-260-4 (ISBN)
Public defence
2015-11-03, L30, Nodhuset, Borgarfjordsgatan 12, Stockholm, 13:00 (English)

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Submitted. Paper 5: Forthcoming.

Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2016-01-14Bibliographically approved

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