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Zoznam článkov

Computing and Informatics

Volume 26, 2007, No. 5
Content:

J. Jung, J.
Semantic Co-Browsing System Based on Contextual Synchronization on Peer-to-Peer Environment.
In Computing and Informatics. Vol. 26, no. 5 (2007), p. 465-467.
K. Sahingoz, O. - C. Sonmez, A.
Agent-Based Fault Tolerant Distributed Event System.
In Computing and Informatics. Vol. 26, no. 5 (2007), p. 489-506.
Čapkovič, F.
Modelling, Analysing and Control of Interactions Among Agents in MAS.
In Computing and Informatics. Vol. 26, no. 5 (2007), p. 507-541.
Alípio, P. - Neves, J. - Carvalho, P.
An Ontology for Network Services.
In Computing and Informatics. Vol. 26, no. 5 (2007), p. 543-561.

	Semantic Co-Browsing System Based on Contextual Synchronization on Peer-to-Peer Environment J. J. Jung Context-awareness, focused crawling, peer-to-peer In this paper, we focus on a personalized information retrieval system based on multi-agent platform. Especially, they are capable of sharing information between them, for supporting collaborations between people. Personalization module has to be exploited to be aware of the corresponding user's browsing contexts (e.g., purposes, intention, and goals) at the specific moment. We want to recommend as relevant information to the estimated user context as possible, by analyzing the interaction results (e.g., clickstreams or query results). Thereby, we propose a novel approach to self-organizing agent groups based on contextual synchronization. Synchronization is an important requirement for online collaborations among them. This synchronization method exploits contextual information extracted from a set of personal agents in the same group, for real-time information sharing. Through semantically tracking of the users' information searching behaviors, we model the temporal dynamics of personal and group context. More importantly, in a certain moment, the contextual outliers can be detected, so that the groups can be automatically organized again with the same context. The co-browsing system embedding our proposed method was shown 52.7 % and 11.5 % improvements of communication performance, compared to single browsing system and asynchronous collaborative browsing system, respectively. Computing and Informatics. Volume 26, 2007, No. 5: 465-467.
	Agent-Based Fault Tolerant Distributed Event System O. K. Sahingoz, A. C. Sonmez Distributed event system, fault tolerance, agvent, agent event, advertisement based routing, publish/subscribe systems In the last years, event-based communication style has been extensively studied and is considered a promising approach to develop large scale distributed systems. The historical development of event based systems has followed a line which has evolved from channel-based systems, to subject-based systems, next content-based systems and finally type-based systems which use objects as event messages. According to this historical development the next step should be usage of agents in event systems. In this paper, we propose a new model for Agent Based Distributed Event Systems, called ABDES, which combines the advantages of event-based communication and intelligent mobile agents into a flexible, extensible and fault tolerant distributed execution environment. Computing and Informatics. Volume 26, 2007, No. 5: 489-506.
	Modelling, Analysing and Control of Interactions Among Agents in MAS F. Čapkovič Agents, analysis, control, decision, discrete-event systems, modelling, Petri nets An alternative approach to modelling and analysis of interactions among agents in multiagent systems (MAS) and to their control is presented in analytical terms. The attention is focused especially on the negotiation process. However, the possibility of another form of the communication is mentioned too. The reachability graph of the Petri net (PN)-based model of MAS is found as well as the space of feasible states. Trajectories representing the interaction processes among agents in MAS are computed by means of the mutual intersection of both the straight-lined reachability tree (from a given initial state towards the terminal one) and the backtracking reachability tree (from the desired terminal state towards the initial one, however oriented towards the terminal state). Control interferences are obtained on the basis of the most suitable trajectory chosen from the set of feasible ones. Computing and Informatics. Volume 26, 2007, No. 5: 507-541.
	An Ontology for Network Services P. Alípio, J. Neves, P. Carvalho Network service specification, multiservice ip networks, network service management Most of the network service specifications are implemented using relational databases or XML schemas. However, those specifications are not flexible and expressive enough to be extended with new service classes, different corporate policies, network configurations and deployment strategies; thus, most of the QoS management operations are implemented as hard-coded software components. This paper presents a novel approach in the specification of IP network services, using F-logic knowledge representation framework, aiming to include, in the same specification, the high-level service requirements, the network model and the necessary operations for the deployment of multiple network services. Computing and Informatics. Volume 26, 2007, No. 5: 543-561.