Cross-Layer Routing Based on Semantic Web Services Discovery with Energy Evaluation and Optimization in MANET

The web services discovery process in mobile adhoc networks is considered as a very difficult challenge due to the continuous change in the topology of the network and also the lack of a fixed central directory for publishing web services. Several approaches have been proposed which are based on either keywords or identifiers representing the service to be searched or by using a specific scenario of discovery. All of those proposed solutions try to respect the constraints of ad hoc networks such as energy, bandwidth, throughput ... etc. In this paper we present our new proposed model for measuring the cost of the overall energy consumption in ad hoc networks depending on the web services discovery protocols. We also present a new optimized web services discovery protocol in MANET based on cross_layer routing techniques with the dissemination in the routing process at the same time the semantic web services information and a Discovery_Diameter parameter that we have proposed to limit the area of discovery in the network. Finally, we present simulation results of our defined approach showing a significant optimization of the energy consumption level and the average throughput

Developing a semantic web-based distributed model management system: Experiences and lessons learned

Distributed model management systems (DMMSs) are decision support systems with a focus on managing decision models throughout the modeling lifecycle and across the extended enterprise. The advent and proliferation of web services and semantic web technologies offers the possibilities of sharing and reusing models in a distributed setting. This paper presents the design and implementation of a semantic web-based DMMS. Key lessons learned, technical and organizational issues encountered are summarized and directions for future research have been outlined. From a technical perspective, future research will need to explore the viability of tools specifically designed to facilitate the semantic annotation of models, specify and validate SA-SMML, and extend the white-box approach presented in this paper to other model types not amenable to structured modeling. From an organizational perspective, further research is needed in the areas of adoption issues and business models that would ensure the sustainable support for of such systems in the service enterprise

A Four-Level Linear Discriminant Analysis Based Service Selection in the Cloud Environment

The cloud is an outstanding platform to deal with functionally equivalent services which are exponentially increasing day-by-day. The selection of services to meet the client requirements is a subtle task. The services can be selected by ranking all the candidate services using their network and non-network Quality-of-Service (QoS) parameters, which is formulated as a NP hard optimization problem. In this paper, we proposed a linear discriminant analysis (LDA) based a four level matching model for service selection based on QoS parameters, which includes description matching of a service, matchmaking phase, LDA-based QoS matching and ranking. The LDA-service selection agent is deployed on each cloud to classify services into classes and rank the services based on the aggregate QoS value of each service. Finally, the test results show the efficiency in service selection with minimal discovery overhead, significant reduction in the computation time and the number of candidate services to be considered

An Indexation and Discovery Architecture for Semantic Web Services and its Application in Bioinformatics

Recently much research effort has been devoted to the discovery of relevant Web services. It is widely recognized that adding semantics to service description is the solution to this challenge. Web services with explicit semantic annotation are called Semantic Web Services (SWS). This research proposes an indexation and discovery architecture for SWS, together with a prototype application in the area of bioinformatics. In this approach, a SWS repository is created and maintained by crawling both ontology-oriented UDDI registries and Web sites that hosting SWS. For a given service request, the proposed system invokes the matching algorithm and a candidate set is returned with different degree of matching considered. This approach can add more flexibility to the current industry standards by offering more choices to both the service requesters and publishers. Also, the prototype developed in this research shows the value can be added by using SWS in application areas such as bioinformatics

Ontologías para servicios web semánticos de información de tráfico: descripción y herramientas de explotación.

RESUMEN Esta tesis forma parte de los denominados Sistemas Inteligentes de Tráfico (ITS) los cuales se basan en la aplicación de tecnologías de Telecomunicaciones e Informática (Telemática) a los sistemas de ayuda al tráfico vial, perteneciendo al dominio Servicios de Información al Viajero (TIS). Como se pone de manifiesto, existen algunos problemas derivados del uso de este tipo de sistemas, desde el punto de vista del usuario, que dan lugar a que éste sea incapaz de obtener la información clara y precisa correspondiente a sus requerimientos. Los principales problemas identificados han sido la falta de un vocabulario común de términos que haga uso de una semántica bien definida que permita obtener el significado (incluso aquél no explícito) de cada concepto de tráfico vial, así como la recuperación de información desde distintas fuentes heterogéneas, de una forma intuitiva y sencilla. Varios aspectos describen la problemática actual relativos al acceso y distribución de la información: 1. Un gran volumen de información de tráfico se distribuye entre varios sitios Web. El principal problema para un usuario que necesita información de este tipo es encontrar estos sitios Web y además tratar con los diferentes accesos a ésta, así como sus diferentes formas de presentación. 2. Por otra parte, un usuario puede necesitar información de diferente naturaleza o tipo, y por lo tanto el almacenaje de toda esta información en un solo sitio Web no es viable a nivel de costes de almacenamiento ni incluso a nivel de mantenimiento. 3. El tratamiento de la información no permite realizar inferencias sobre ella de manera que pueda ser obtenido como resultado, información que a priori no estuviera explícitamente detallada. Tras el descubrimiento de la problemática existente y la identificación de elementos que pudieran solventar esta situación, el presente trabajo se centra en el estudio de los sistemas ITS orientados a facilitar información de tráfico al usuario, y que a su vez permitan la gestión de la información, su tratamiento e intercambio, de manera eficaz entre los diferentes elementos que componen la arquitectura de servicios de información de tráfico, como los usuarios, aplicaciones, y proveedores de la información. Para la consecución de los objetivos marcados han sido desarrollados diversos elementos como parte integrante de una arquitectura, que supusieron determinados aportes y/o resultados: 1. Construcción de una infraestructura ontológica cuyo dominio queda enmarcado en la información sobre tráfico vial. 2. Se ha expuesto un marco de trabajo para la conversión de portales Web convencionales de información en Servicios Web Semánticos (SWS). 3. Extensión a las metodologías de construcción de ontologías, previamente existentes, para plantear el proceso a seguir en la obtención de un modelo semántico formal a partir de un modelo de Entidad-Relación (ER). 4. Se ha diseñado, implementado y evaluado, un algoritmo de emparejamiento de SWS, que aprovecha al máximo las capacidades proporcionadas por las ontologías de descripción de servicios y que constituye una mejora de los ya existentes. Inclusión del grado fraternal o de hermanos y otra serie de modificaciones. 5. Se han mostrado una serie de propuestas que permiten crear y manejar Servicios Web Semánticos de información de tráfico vial: nuevo parámetro no funcional (valor añadido), ontología de categorización de servicios de tráfico y elección de factores de medida en la QoS. Finalmente las propuestas han sido validadas a partir del desarrollo de un prototipo software basado en la arquitectura de integración de SWS de información sobre tráfico vial, que ha permitido el ensamblaje de todos los elementos (ontologías de tráfico, algoritmo de emparejamiento, servicios de información de tráfico), obtenidos como resultado en cada una de las etapas de esta investigación. __________________________________________________________________________________________________This thesis forms part of the common Intelligent Transportation Systems which in turn are based on the application of telecommunication and Informatics (Telematics) to traffic management which belongs to the domain of Traveller Information.. The principle identified problems are the lack of a common vocabulary of elements which use a well defined semantic description which permits obtaining the meaning (including the non-explicit) of each concept of rural traffic as well as obtaining information from different heterogeneous sources in an intuitive and simple way. Different aspects describe the actual problem related to the access and distribution of information: 1. High volume of traffic information is distributed over different web sites. The main problem for a user who needs such information is to find such webs and handle the different ways of access and presentation 2. On the other hand, the users need information of a different nature or type, and the storage of such information on a simple site would be too costly as well for maintenance. 3. It is no possible to obtain any information if this information is not explicit before, After defining the existing problems and identifying the elements which could solve this situation, the present work focuses on those ITS-systems which provide traffic information to the user, its handling and exchange, in an efficient way between the elements which compose the architecture of traffic information systems, such as users applications and information providers. Different elements have been developed as an integral part of an architecture: 1. Construction of an ontological infrastructure which domain is covered by road traffic information, 2. A framework was defined for the conversion of conventional web portals to semantic web services (SWS), 3. Extension of the existing methodology for the construction of ontologies based on ER model, 4. A SWS matching algorithm was designed, implemented and evaluated which make maximal use of the capabilities of the ontologies of the service description, which constitute an improvement of the existing ones. 5. A number of proposals were demonstrated which permits creation and handling of Semantic web services of road traffic information

BRINGING SEMANTIC SECURITY TO SEMANTIC WEB SERVICES

Abstract: Semantic Web services begin to emerge as the next evolution of the Service Oriented Architecture. It is become clear that authorization is going to be one of the biggest challenges. The typical obstacles which most areas of Semantic Web services have had to overcome are what parts of a Web services need semantic information, how best to use the semantics, and agreeing on standards. However, for authorization there are the fine grained security implications as well. For instance, how much authorization information is necessary to aid in Semantic Discovery of Web services? Is the authorization information opening any new security holes? We will examine a framework for expressing the proper authorization information in order to aid in the Semantic Discovery of Web services in which the requesting service most likely has the authority to invoke