Stanislaw Ambroszkiewicz

A Model of BDI-Agent in Game-Theoretic Framework

A model of BDI-agent in game-theoretic framework is presented. The desire is represented as agents goal to achieve a maximum level of utility. A reasoning process based on agents rational behavior is proposed. This process determines agents intention. It is also shown how to use the backward induction consistently with the assumption of the common knowledge of rationality.

On the concept of agent in multi-robot environment

Although, the software agent paradigm has been widely accepted, there is still a problem with situating (implementing) concrete agents in real environments. Agent is an abstract notion so that there is no straightforward mapping of real entities like robots, spacecrafts or any other autonomous systems to agents. An interesting discussion on this subject was done within the framework of LOGOS and ACT Agent Architecture in the context of ground and space systems, see [10,11]. In the paper we discuss the problem of situating agents in open systems consisting of cognitive heterogeneous robots that are supposed to perform jointly complex tasks. The starting point of the discussion is the archtecture of the M-agent.

Agent Based Approach to Service Description and Composition

An approach to service description and composition is presented. It is based on agent technology, and on the idea of separating description and composition language from biding, i.e., from specification of data format (exchanged by applications) and transport protocol. Usually, the biding is an integral part of description language, e.g., WSDL, and DAML-S. Starting with this idea, a simple service description language is constructed as well as a composition protocol is specified. Agents play crucial role in our approach; they are responsible for service composition.

enTish: An Approach to Service Composition

A new technology for service description and composition in open and distributed environment is proposed. The technology consists of description language (called Entish) and composition protocol called entish 1.0. They are based on software agent paradigm. The description language is the contents language of the messages that are exchanged (between agents and services) according to the composition protocol. The syntax of the language as well as the message format are expressed in XML. The language and the protocol are merely specifications. To prove that the technology does work, the prototype was implemented. A demo of the prototype is available for use and evaluation via web interfaces starting with www.ipipan.waw.pl/mas/ . Related work was done by WSDL + BPEL4WS + (WS-Coordination) + (WS-Transactions), WSCI, BPML, DAML-S, SWORD, XSRL, and SELF-SERV. Our technology is based on similar principles as XSRL, however the proposed solution is different. The language Entish is fully declarative contrary to BPEL4WS and DAML-S. A request (expressed in Entish) describes the desired static situation to be realized by the composition protocol.

Agentspace as a Middleware for Service Integration

Agentspace is an emerging environment resulting from process automation in the Internet and the Web. It is supposed that autonomous software (mobile) agents provide the automation. The agents realize goals delegated to them by their human masters. Interoperability is crucial to assure meaningful interaction, communication and cooperation between heterogeneous agents and heterogeneous services. In order to realize the goals, the agents must create, manage and reconfigure complex workflows. Usually, a workflow integrates a number of heterogeneous services. Our research aims at extracting a minimum that is necessary and sufficient for providing transparency between users and services, i.e. for joining applications as services to agentspace on the one hand and for using and integrating them by heterogeneous agents (on behalf of their users) on the other hand. For this very purpose we introduce a new concept of agent architecture as well as the new agent mobility form called soul migration.

Knowledge and best responses in games

Processes of iterated elimination of strategies that are not best responses are studied. Some suggestions are made about how rational players may use their mutual knowledge about game and behavior.

The SOA paradigm and e-service architecture reconsidered from the e-business perspective

A business service has well founded structure where its operations (corresponding to request-quote, order-contract, invoice-payment) are related to each other. These relations cannot be expressed in WSDL. The request-quote operation corresponds to SLA negotiations and can be performed in a universal description language such as OWL that can also express all the relations between service operations mentioned above. Generally, from the e-business perspective the following notions are important: (1) Service architecture. (2) Communication protocols in e-business processes. These notions are crucial for providing standards necessary for creating open, heterogeneous and scalable systems for realizing complex e-business processes. These notions are discussed in the paper.

Modeling Agent Organizations

We present a formal specification of an environment created by our mobile platform Pegaz [17]. Since all existing mobile agent platform create more or less the same infrastructure on a computer network, this formal specification may be seen as a formal representation of the cyberspace Then, we present a concept of agent organizations in a model of production environment. It is argued that such organizations can be applied in the cyberspace. Agents are supposed to form enterprises producing the commodity specified by the system designer, and then sell the commodity at the market. The goal of the designer is to create efficient enterprises producing the desired commodity. The market is modeled as the price oligopoly. The price oligopoly serves to eliminate enterprises that are not efficient.

Entish: Agent Communication Language for Service Integration

A new technology for service description and composition in open and distributed environment is proposed. The technology consists of description language (called Entish) and composition protocol called entish 1.0. They are based on software agent paradigm. The description language is the contents language of the messages that are exchanged (between agents and services) according to the composition protocol. The syntax of the language as well as the message format are expressed in XML. The language and the protocol are merely specifications. To prove that the technology does work, the prototype implementation is provided. It is still under testing. However, it is available for use and evaluation via web interfaces starting with the website www.ipipan.waw.pl/mas/. The specifications were created on the basis of the requirements produced by the Service Description and Cornposition Working Group ( www.ipipan.waw.pl/mas/sdc-wg ) of Agentcities.NET project. Related work was done by WSDL -+- BPEL4WS + (WS-Coordination) + (WS-Transactions), and DAML-S. Our technology is based on different principles. The language Entish is fully declarative contrary to BPEL4WS and DAML-S. A task (expressed in Entish) describes the desired static situation to be realized by the composition protocol.

On the concepts of rationalizability in games

Rationalizability arises when the decision situations and rational behaviors of the players are common knowledge among them. We extend the notion of rationalizability, introduced by Bernheim [5] and Pearce [18] for Bayesian behavior, to some another kinds of players behavior. We also present a representation of common knowledge consisting in introducing an additional player who sends messages to the players.