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

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

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

HILDE : A Generic Platform for Building Hypermedia Training Applications

this paper, we present an environment, called HILD

Business models and transactions in mobile electronic commerce: requirements and properties

Advances in wireless network technology and the continuously increasing number of users of hand-held terminals make the latter a possible channel for offering personalized services to mobile users and give pace to the rapid development of mobile electronic commerce (MEC). MEC operates partially in a different environment than Internet e-commerce due to the special characteristics and constraints of mobile terminals and wireless networks and the context, situations and circumstances in which people use their hand-held terminals. In this paper, we discuss the business models in MEC and transaction modeling issues pertinent for the business models and the environment. (C) 2001 Elsevier Science B.V. All rights reserved

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