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

Infraestrutura de software Continuum para a computação ubíqua: uma abordagem baseada em serviço

The latest technological advances, which introduced innovative and more affordable devices, have contributed to boost the practical application of research in the field of ubiquitous computing (ubicomp). For the development of applications in this area, we need an adequate software infrastructure. In order to do so, we have proposed Continuum, an infrastructure based on service-oriented architecture (SOA), making use of framework and middleware, and employing a redefinition of follow-me semantics. In this redefined vision, users can go anywhere carrying the data and application they want, which they can use in a seamlessly integrated fashion with the real world. In this article, we focus on the description of the service-based architecture proposed for Continuum. The proposal widens the web services standards to support the mobility of services, allowing them to be deployed, copied, or moved. Besides, the abstraction provided enables the adaptation of legacy applications as Continuum pluggable services. We conduct some experimental analysis, using case study methodology. Based on these assessments, we present lessons learned and draw the conclusion of our work.Keywords: software infrastructure, middleware, web services, service oriented architecture, ubiquitous computing.Os mais recentes avanços tecnológicos, com a introdução de dispositivos inovadores e mais baratos, contribuem para o aumento da aplicação prática das pesquisas na área de computação ubíqua (ubicomp). Para o desenvolvimento de aplicativos nessa área, é necessária uma infraestrutura de software adequada. Para atingir esse objetivo, esse artigo propõe o Continuum, uma infraestrutura baseada na arquitetura orientada a serviços (SOA), fazendo uso de framework e middleware. Além disso, a arquitetura emprega uma visão redefinida da semântica siga-me, na qual usuários podem ir aonde quiserem carregando os dados e aplicativos desejados, utilizando-os de forma integrada com o mundo real. Nesse artigo, é dado foco para a descrição da arquitetura orientada a serviços proposta para o Continuum. A proposta amplia os padrões de serviços web para suportar a mobilidade de serviços, permitindo que eles sejam instalados, copiados ou movidos. Adicionalmente, a abstração fornecida permite a adaptação de aplicações legadas como serviços plugáveis do Continuum. Algumas análises experimentais foram conduzidas, usando a metodologia de estudo de caso. Baseada nessas avaliações, algumas lições que foram aprendidas são apresentadas e algumas conclusões do trabalho são definidas.Palavras-chave: infraestrutura de software, middleware, serviços web, arquitetura orientada a serviços, computação ubíqua

Toward Customizable Multi-tenant SaaS Applications

abstract: Nowadays, Computing is so pervasive that it has become indeed the 5th utility (after water, electricity, gas, telephony) as Leonard Kleinrock once envisioned. Evolved from utility computing, cloud computing has emerged as a computing infrastructure that enables rapid delivery of computing resources as a utility in a dynamically scalable, virtualized manner. However, the current industrial cloud computing implementations promote segregation among different cloud providers, which leads to user lockdown because of prohibitive migration cost. On the other hand, Service-Orented Computing (SOC) including service-oriented architecture (SOA) and Web Services (WS) promote standardization and openness with its enabling standards and communication protocols. This thesis proposes a Service-Oriented Cloud Computing Architecture by combining the best attributes of the two paradigms to promote an open, interoperable environment for cloud computing development. Mutil-tenancy SaaS applicantions built on top of SOCCA have more flexibility and are not locked down by a certain platform. Tenants residing on a multi-tenant application appear to be the sole owner of the application and not aware of the existence of others. A multi-tenant SaaS application accommodates each tenant’s unique requirements by allowing tenant-level customization. A complex SaaS application that supports hundreds, even thousands of tenants could have hundreds of customization points with each of them providing multiple options, and this could result in a huge number of ways to customize the application. This dissertation also proposes innovative customization approaches, which studies similar tenants’ customization choices and each individual users behaviors, then provides guided semi-automated customization process for the future tenants. A semi-automated customization process could enable tenants to quickly implement the customization that best suits their business needs.Dissertation/ThesisDoctoral Dissertation Computer Science 201

S.: Web service discovery, replication, and synchronization in ad-hoc networks

Mobile ad-hoc networks with their arbitrary topologies are a difficult domain for providing highly available Web services. Since hosts can move unpredictably, finding services and featuring their constant and reliable functionality poses a challenge. In this paper we present a flexible system which is not only bound to ad-hoc networks, but can be used in any other environment. Our solution offers a discovery technique which keeps UDDI information in distributed registries up-to-date and includes a replication and synchronization mechanism which provides backup services for a highly increased service dependability