Catálogo de publicaciones - libros

Knowledge-based Web information system should be considered for performance with different types of mobile agents serviced by different mobile communication operators. The ubiquitous Web information server accessed by a user-group with various mobile agents should be a unified center for unified-and-ubiquitous (U) knowledge-based Web information services. We studied the performance of Web information access, i.e. the registration and retrieval of information/knowledge, with mobile agents for Uknowledge-based Web information services. We show the empirical results based on the implementation and experience got both in Korea and in Japan.

Studies have been conducted on pre-fetching models based on decision trees, Markov chains, and path analysis. However, the increased uses of dynamic pages, frequent changes in site structure and user access patterns have limited the efficacy of these static techniques. One of the techniques that are used for improving user latency is Caching and another is Web pre-fetching. Approaches that bank solely on caching offer limited performance improvement because it is difficult for caching to handle the large number of increasingly diverse files. An agent based method is proposed here to cluster related pages into different categories based on the access patterns. Additionally page ranking is used to build up the prediction model at the initial stages when users are yet to invoke any page.

With the increasing use of XML, considerable research is being conducted on the XML document management systems for more efficient storage and searching of XML documents. Depending on the base systems, these researches can be classified into object-oriented DBMS (OODBMS) and relational DBMS (RDBMS). OODBMS-based systems are better suited to reflect the structure of XML-documents than RDBMS-based ones. However, using an XML parser to map the contents of documents to relational tables is a better way to construct a stable and effective XML document management system. The proposed X-Binder system uses an RDBMS-based inverted index; this guarantees high searching speed but wastes considerable storage space. To avoid this, the proposed system incorporates a path combining module agent that combines paths with sibling relations, and stores them in a single row. Performance evaluation revealed that the proposed system reduces storage wastage and search time.

The development of various digital broadcasting services and the rapid growth of broadband network infrastructure have accelerated the convergence of broadcasting and communication services. To show the potentiality of hybrid or convergence technologies, we designed and implemented a hybrid Electronic Program Guide (EPG) agent system for digital broadcasting systems, which provides comprehensive information from broadcast and web information sources. The implemented hybrid EPG agent system can provide detailed information for a specific program by combining broadcast information and web information retrieved from the scattered web pages. The methods of searching the URLs that contain the related information for a specific TV program and retrieving the related information from the selected web pages are proposed.

The vision of global agent-based e-commerce environments that enable dynamic trading between business partners requires the study and development of suitable formal modeling frameworks. In particular, negotiation is a necessary and important activity to allow engagement of business parties in non-trivial business relationships. In this note we propose a formal framework using for modeling and analysis of agent-based negotiations, with a focus on a particular price negotiation – English auction.

Interface agents are applications of recommender systems that are applied in many areas such as information filtering, information retrieval or web browsing. Different reasoning methods that are known from many disciplines: Artificial Intelligence, Expert Systems or Information Retrieval are being used by recommender systems. Recently, the recommender systems also adopt some nature inspired methods such as Artificial Immune System (AIS). In this paper we present application of AIS collaborative filtering in the system Reporter that is based on Wiki-news and recommends both articles and interface layouts. Wiki-based information systems are gaining its popularity among many different users so it is becoming necessary to apply recommendation for most effective information delivery.

Many types of information are geographically referenced and interactive maps provide a natural user interface to such data. However, the process to access and retrieve geospatial data presents several problems related to heterogeneity and interoperability of the geospatial information. Thus, information integration and semantic heterogeneity are not trivial tasks. Therefore, we propose a w system focused on retrieving geospatial information by means of geospatial ontologies and representing this information on the Internet. Moreover, a Multi-Agent System is proposed to deal with the process related to obtain the tourist geo-information, which aids in the information-integration task for several nodes (geographic sites) that are involved in this application. The agent system provides the mechanism to communicate different distributed and heterogeneous Geographic Information Systems and retrieves the data by means of GML description. Also, this paper proposes an interoperability approach based on geospatial ontologies matching that is performed by the Multi-Agent System in each node considered in the application. The retrieval mechanism is based on encoding the information in a GML description to link each geospatial data with a concept of the ontologies that have been proposed.

When browsing the Web, users demand the low latency, high throughput and high availability of Web pages. Therefore each Web site should be measured, tested and evaluated from the user’s perspective. In the paper, we present the architecture of the system MWING that is able to test, measure and diagnose Web sites from the user point of view. It is a new generation system that adds new functions and extends the functionality and performance of the previously developed WING tool. MWING is now the multiagent measurement platform able to cooperate with independently developed measurement agents. Here we present how the MWING works and how the new architecture meets the ultimate user needs.

Web is the boundless source of information and no one is able to process the vast amount of new documents published on the web every day, even with filtering out the documents the user is not interested in. However, most of the recent web documents are blog posts, news and other documents with the author information established. Each author who is also the receiver of web documents possesses their own personal agent that delivers trust information related to other authors as well as rank data for each new document. Trusts and ranks available for agents are exchanged between them and in this way new authors and new web documents can be easily assessed. Based on the general concept of Web of Trust the new idea of Personal Web of Trust and its application to local ranking method for web documents is proposed in the paper.

Non-repudiation of a mobile payment transaction ensures that when a buyer (B) sends some messages to a seller (S), neither B nor S can deny having participated in this transaction. An evidence of a transaction is generated by wireless PKI mechanism such that B and S cannot repudiate sending and receiving the purchase order respectively. The broker generates a mobile agent for B which carries encrypted purchase order to the seller. One trusted third party acts as a lightweight notary for evidence generation. One advantage of this agent-based non-repudiation protocol is to reduce inconvenience for mobile clients such as connection time; it causes difficulty for fair transaction for mobile payments.