74 research outputs found
Unified publication and discovery of semantic web services
The challenge of publishing and discovering Web services has recently received lots of attention. Various solutions to this problem have been proposed which, apart from their offered advantages, suffer the following disadvantages: (i) most of them are syntactic-based, leading to poor precision and recall, (ii) they are not scalable to large numbers of services, and (iii) they are incompatible, thus yielding in cumbersome service publication and discovery. This article presents the principles, the functionality, and the design of PYRAMID-S which addresses these disadvantages by providing a scalable framework for unified publication and discovery of semantically enhanced services over heterogeneous registries. PYRAMID-S uses a hybrid peer-to-peer topology to organize Web service registries based on domains. In such a topology, each Registry retains its autonomy, meaning that it can use the publication and discovery mechanisms as well as the ontology of its choice. The viability of this approach is demonstrated through the implementation and experimental analysis of a prototype. © 2009 ACM
Credible reputation metric for P2P e-communities
Peer-to-Peer (P2P) systems and applications are attracting a lot of attention nowadays, as they mimic human communities and support useful community. Due to their social and decentralized nature, trust plays an essential role for their functionality. P2P reputation systems have emerged in order to satisfy this need for trust. However, reputation systems themselves are targets of multiple kinds of attacks which should be taken into consideration during the design of the former in order to be effective. In this paper we propose a reputation mechanism for P2P e-communities of entities which offer services to each other. The focus is on the reputation inference algorithm (reputation metric) which integrates various credibility factors. © 2010 Springer-Verlag Berlin Heidelberg
A generic query model for the unified discovery of heterogeneous services
In this paper, we propose Proteus, a generic query model for the discovery of operations offered by heterogeneous services. We demonstrate the need for such a model, and show how it unifies the task of service discovery through abstractions, which allow for the technology-independent formulation of service advertisements, queries, and query responses. On top of these generic elements, we build an intuitive, fuzzy-based query evaluation mechanism that supports the service matchmaking process by employing and appropriately combining existing similarity metrics. Thanks to the generality of Proteus, it is possible to seamlessly accommodate the discovery of operations provided by various types of services without the need of changing the existing service infrastructure. Thus, our approach is applicable to a variety of settings ranging from traditional web services to service-oriented grids, peer-to-peer networks, geospatial information systems, and so on. Overall, compared to the existing query models supported by standard service discovery technologies, our approach is marked by openness, flexibility, and improved performance in terms of precision and recall. The feasibility and efficiency of Proteus are verified by a series of experiments. © 2008-2012 IEEE
HILDE : A Generic Platform for Building Hypermedia Training Applications
this paper, we present an environment, called HILD
A MULTIMEDIA TITLE DEVELOPMENT ENVIRONMENT (MTDE)
The development of Multimedia Titles (M-Titles) (i.e., multimedia
applications stored on CDs) is performed by many designers and
implementors using tools that run on specific platforms and often have
complementary and/or overlapping functionality. The potential designer
or implementor of an M-Title is restricted by the availability of tools
on a selected development platform. This paper presents a Multimedia
Title Development Environment (MTDE), which integrates multimedia
information, tools used to produce it, as well as their formats and
storage media as objects in an Asset Repository. The cooperative
construction of complex multimedia objects is modelled as a DAG
consisting of two types of nodes: multimedia objects and actions
applied to multimedia objects. An M-Title consists of a number of
complex multimedia objects linked with each other in a hypernetwork of
relationships. MTDE enables a group of authors to cooperatively
construct M-Titles as a hypernetwork of multimedia nodes by activating
tools running on various platforms, by exploiting the hypermedia
functionality of MTDE, and by reusing existing material from the Asset
Repository
E-services: Current technology and open issues
The Internet changes the way business is conducted. It provides an affordable and easy way to link companies with their incorporating trading and distribution partners as well as customers. However, the Internet’s potential is jeopardized by the rising digital anarchy: closed markets that cannot use each other’s services; incompatible applications and frameworks that cannot interoperate or build upon each other; difficulties in exchanging business data; lack of highly available servers and secure communication. One solution to these problems is a new paradigm for e-business in which a rich array of modular electronic services (called e-services) is accessible by virtually anyone and any device. This new paradigm is currently the focus of the efforts of many researchers and software vendors. This paper presents the e-services architecture, its advantages as opposed to today’s applications and gives an overview of evolving standards. It then presents the related technical challenges, the way some of them are addressed by existing technology and the remaining open issues. © Springer-Verlag Berlin Heidelberg 2001
Reputation-based trust systems for P2P applications: Design issues and comparison framework
In Peer-to-Peer (P2P) computing area trust issues have gained focus as a result of the decentralized nature of P2P systems where autonomous peers interact with each other without relying on any central authority. There is, thus, the need of a trust system to ensure a level of robustness against malicious nodes. Various reputation-based trust models have been proposed for P2P systems which use similar concepts but focus on different aspects and address different set of design issues. As a result, there is a clear need to investigate the design aspects of reputation-based trust systems that could be deployed in P2P applications. In this paper we present the basic elements and design issues of such systems and compare representative approaches, aiming at supporting the design of reputation systems suitable for particular P2P applications. © Springer-Verlag Berlin Heidelberg 2006
Rule-based behaviour modelling: specification and validation of information systems dynamics
E-services interoperability analysis and roadmap actions
e-Services are the building blocks for loosely-coupled, distributed applications based on the Service Oriented Architecture's principles. One of the major benefits they offer is interoperability both between components of Service Oriented systems and between different systems. Still, the variety and diversity of implementations and interpretations of SOA and the vast amount of emerging standards hinder interoperability. This paper examines the interoperability requirements and related issues for each one of the major e-Services categories: Web, Grid and P2P services. Our aim is to provide the basis for a roadmap towards improving interoperability of e-Services which will enable the successful formation of service-based distributed applications. © 2005 by International Federation for Information Processing
- …