By Tony C. Shan (auth.), José Cordeiro, Slimane Hammoudi, Joaquim Filipe (eds.)

This booklet constitutes the completely refereed post-conference lawsuits of the 4th overseas convention on net details platforms and applied sciences, held in Funchal, Madeira, Portugal, in may possibly 2008.

The 32 papers awarded during this e-book have been conscientiously reviewed and chosen from 238 submissions, leading to an popularity fee of 13.5%. The papers are grouped in 4 components on net know-how; internet interfaces and functions; society, e-Business, and e-Government; and e-Learning. additionally, 4 invited papers entire this volume.

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Extra resources for Web Information Systems and Technologies: 4th International Conference, WEBIST 2008, Funchal, Madeira, Portugal, May 4-7, 2008, Revised Selected Papers

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In this context let us introduce an initial understanding of the notion of a module. Let us thus say that a module is an object that encapsulates appropriate knowledge and behaviors required for an agent to instantiate a specific functionality. For instance, a Department Management Module will group behaviors and knowledge that allow the Personal Agent extended by such module to interact with the system and support a member of the Department Management Team in completing Department Management-related tasks.

Fra¸ckowiak1, M. Ganzha1 , M. Paprzycki1, M. -S. -W. kr Abstract. Ability of an organization to adapt to change is one of its important features. When a real-world organization is transformed into a virtual one, with a help of software agents and ontologies, it is important to specify how adaptability can be achieved. In our earlier work we have conceptualized, on a general level, adaptability in an agent-based virtual organization. The aim of this chapter is to discuss how agent adaptability can be implemented.

While injecting new modules is rather easy to achieve (agents can self-inject with additional modules), module updating is a more complex problem. Let us observe that: – when we introduce new modules we have to be sure that every agent in the system will “instantaneously” start working with the same version of the module; situation in which agents try to communicate with each other while utilizing incompatible procedures/messages/protocols can result in a disaster – update cannot occur in the middle of a conversation/transaction between any affected agents; as a matter of fact, agents cannot switch behavior version (kill older version and load a new one) if the current one is a part of a still working process.

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