1,720,982 research outputs found
Enhancing dynamic selection of Web service access points
No full textThis paper defines the main logical functionalities and the software architecture of a framework that overcomes the limits of UDDI in fully exploiting the advantages offered by dynamic binding. The framework, relying on the ser vices offered by remote monitoring agents, makes it pos sible for UDDI Registries to associate a value of conve nience to different implementations of the same tModel. This value will lead Service Requestors in the choice of implementations to be contacted and invoked. UDDI Reg istries with this enhanced behavior still expose an interface compliant to the standard UDDI specification, thus being fully and transparently integrable in the UDDI infrastruc ture. The framework fills the gap existing between ap proaches to the discovery of Web Services that do not deal with any aspect of their performance and more complex so lutions that guarantee a certain level of quality in providing services. This paper also describes the main design and implementation issues concerning a first open source Java prototype of the framework
A description logic based grid inferential monitoring and discovery framework
No full textIn this paper we propose a new architecture for an inferential monitoring and discovery system for Grid. The system supports reasoning activities on a knowledge base formalising the relevant concepts and relevant relationships to a grid computing environment. The current applied Grid Information Index Sys- tem (GIS) shows infrastructural and technological limits. First of all, LDAP, the underling technology for information data manage- ment, has not been conceived to deal with dynamic information and its data model is not expressive enough to describe a complex information system like the one needed to properly manage Grid. Moreover GIS, does not manage effectively resources and events information. The re-actions to events are left to human responsibilities, so Grid cannot adapt its behaviour by itself, as wished in a dynamic changing environment. The goal of this work is to define an inferential GIS that adds autonomous capabilities to the Grid middleware. This is achieved by defining a Grid Ontology and an agent building a KB on that Ontology. Furthermore we add Inferential capabilities to the GIS for prediction, deduction and query activities
Extending the UDDI API for service instance ranking
No full textIn order for Web services to be able to fully exploit the advantages of dynamic binding, requesting agents must be given a way to select the most ”convenient” service at invoke time. Current techniques do not address the problem of selecting services that best fit a requester’ needs. In this paper, we propose an extension of the UDDI specification in order to provide and exploit predictions about the behavior of Web services. Such values/parameters are expressed in terms of availability, reliability and completion time. The computed predictions are used by requesting agents to implement an effective dynamic service selection. A prototype, named eUDDIr, implementing such extension has been developed. Our proposal is particularly suited for scenarios where requestors do not wish to explicitly deal with QoS aspects, or in case provider agents have no convenience in building up the infrastructure for guaranteed QoS, but aim to provide services of good quality to their customers. The adoption of eUDDIr can effectively improve the service requestors ”satisfaction”, in particular when they are involved in a Web services composition process
FUB, IASI-CNR and University of ”Tor Vergata” at TREC 2008 Blog Track
Full text linkWe take part in the opinion and polarity retrieval tasks of the blog track.
A test collection, called Blog06, was created for the blog track in 2006 with three main different components: feeds, permalinks and home-pages. The collection contains spam as well as possibly no blogs and no english pages. For our
experimentation only permalinks have been taken into consideration, consisting
of 3.2 million of Web pages for a total of 88.8GB, each one containing a post
and its related comments.
The evaluation metrics are precision/recall based, the Mean Average Precision (MAP) and R-Precision (RPrec), but we also focused on Precision at 10
(P@10), due to its relevance in evaluating the effectiveness of Web search engine
N-JIS: a System for Web Services Integration in Java RMI Distributed Applications
No full textIn this paper we describe the main architectural and implementation aspects of a system, the Netlab Java Integration System (N-JIS), which makes it possible to developers of RMI distributed applications to access RPC based Web Services in the same way they access RMI Objects. Moreover N-JIS allows to register multiple components, either RMI Objects or Web Services, providing the same functionalities and is able to perform a run time selection of the best component according to a programmer specified evaluation criterion
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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