Catálogo de publicaciones - libros

We propose an efficient search scheme based on a self-organizing hierarchical ring structure in unstructured peer-to-peer systems. Our solution maintains a consistent super-peer ratio and makes the peers with relatively high capacities super-peers in dynamic environments. The benchmarking results show that the proposed algorithm outperforms the static algorithm that has the fixed number of rendezvous peers such as JXTA.

The Second International Workshop on Agents, Web Services and Ontologies Merging (AWeSOMe’06) is held in conjunction with the OnTheMove Federated Conferences (OTM’06) in Montpellier, France, 29th October 2006. AWeSOMe is an interdisciplinary workshop focusing on research and applications combining web services, ontologies and agents leading to the development of an intelligent service Web.

Web services are a rapidly expanding approach to building distributed software systems across networks such as the Internet. A Web service is an operation typically addressed via a URI, declaratively described using widely accepted standards, and accessed via platform-independent XML-based messages.

There are two types of behavioural model in the WSMO semantic description of services: an orchestration and a choreography, together called the interface. While an orchestration defines a service’s behaviour as a composition of existing parts, a choreography is intended to document the conversation of messages exchanged with a single client. In this paper we present a three-level model for behavioural descriptions, and how the Cashew workflow model fits into this, building on existing work in, and establishing connections with, semantic web services, workflow, and software engineering design.

Real-time animation of virtual humans, capable of interacting realistically with others, requires a sophisticated architecture for the integration of different elements. A more flexible architecture for intelligent virtual agents emphasizing on the learning process should be designed to fulfil these requirements. In this paper we present an open and flexible architecture, IVAL, that has being designed to accomplish the requested necessities. IVAL is based on the Web Service principles, as well as on the fundaments of the Open Agent Architecture (OAA) and it intends to accomplish determined objectives through the cooperation with other agents that inhabit the environment. One of the main purposes is to introduce a realistic learning process based on the interaction with the environment as similar as possible to humans been doing. This paper also presents a set of languages, based on the standard Extensible Markup Language (XML), that have been designed to get a more appropriate representation of all the required information elements.

In this paper, we present a new extension and reinterpretation of one of the most successful models of awareness in Computer Supported Cooperative Work (CSCW), called the Spatial Model of Interaction (SMI), which manage awareness of interaction through a set of key concepts, to manage task delivery in collaborative distributed systems. This model , called AMBLE (Awareness Model for Balancing the Load in Collaborative Grid Environments), also applies some theoretical principles of multi-agents systems to create a collaborative environment that can be able to provide an autonomous, efficient and independent management of resources available in a Grid. This model has been implemented using web services and some experimental results carried out over and real and heterogeneous grid are presented with the end of emphasizing the performance speedup of the system using the AMBLE model.

Semantic web services have the potential to change the way knowledge and business services are consumed and provided on the Web. The current semantic web service architectures, however, do not provide with integrated functionality of automated composition, dynamic binding, and invocation. Openness and dynamics of the Web environment limits the usage of previous approaches based upon the traditional AI planning techniques. This paper introduces a BDI agent system for semantic web service composition and invocation. Through some tests on healthcare web services, we found our agent-oriented approach has the potential enough to improve robustness and flexibility of semantic web services.

Mediation between buyers (service requester’s agents) and sellers (service provider’s agents) is one of the most difficult problems in real electronic markets. In this paper, we propose an economic approach to solving this problem combined with AI () concepts. Firstly, we enable provider agents to dynamically and autonomously advertise semantic descriptions of available services by proposing a new auction model based on Pay-Per-Click advertising auctions. We call it the Semantic Pay-Per-Click Agent (SPPCA) auction. Requester agents then use two-level filtration of the advertised services to efficiently discover eligible services. In the first level of filtration, a semantic-based mechanism for matchmaking between services requested by buyers and those advertised by sellers is applied. Services which pass the first level of filtration are then considered on the second level. Here information regarding the actual performance of service providers is considered in conjunction with the prices bid by service provider’s agents in the SPPCA auction. A final set of advertised services is then chosen and proposed to the buyer agent as an answer to its request.

Innovations in web technologies during last years have caused changes in the way that Web Information Systems are developed. New tools such as XML or Web Services and new paradigms, such as Service Oriented Computing make IT analysts focus on business process. To implement these business process there are several technologies. The aim of this work is to analyze business process implementation possibilities by using existing technologies, but focusing on those that require a user interaction, such as: a process to buy a flight ticket or a process for billing approval. In this work, we follow a comprehensive method for business process development to get detailed business process models and then we analyze the implementation possibilities of the resulting models, describing advantages and disadvantages for each technology analyzed and pointing out a possible workaround.

Ontologies as means for conceptualizing and structuring domain knowledge within a community of interest are seen as a key to realize the Semantic Web vision. However, the decentralized nature of the Web makes achieving consensus across communities difficult, thus, hampering efficient knowledge sharing between them. To address this problem of heterogeneity we propose a Categorization Framework (CF) that makes it possible to use (multilingual) terminology to specify concepts and concept relations in domain ontologies. Such CF could describe the meaning of concepts and concept relations by means of terminological information and external references. We believe that such (multilingual) ontology description could enhance the (re)usability and facilitate the coordination of domain ontologies.

Community Informatics, also known as community networking, electronic community networking, community-based technologies or community technology refers to an emerging set of principles and practices concerned with the use of Information and Communications Technologies (ICTs) for personal, social, cultural or economic development within communities; for enabling the achievement of collaboratively determined community goals; and for invigorating and empowering communities in relation to their larger social, economic, cultural and political environments.

From an academic and research perspective Community Informatics can be seen as a field of practice in applied ICT. It brings together the practices of community (and economic and social) development with insights from fields such as sociology, planning, development studies, women’s studies, library and information sciences, management information systems, and management and computer sciences. Its outcomes – community networks and community-based ICT-enabled service applications – are of increasing interest to grassroots organizations, NGOs and civil society, governments and multi-lateral agencies, and the private sector, among others. Self-organized community ICT initiatives spanning the range of application areas including health, social and economic development, small business, environmental management, and local governance have been emerging world-wide with the objective of harnessing ICTs for developing social capital, poverty alleviation and empowerment at the local level. As well, collaborative communities enabled with ICTs are helping to bridge organizational boundaries, ensuring more effective and efficient forms of collaboration in and between stakeholders from business, government, education, and civil society.