A Realidade Virtual é usada na produção de simulações complexas de ambientes virtuais 3D, envolvendo dispositivos de entrada e saída não triviais, para proporcionar aos usuários sensações de imersão em mundos simulados de tempo real. O projeto e o desenvolvimento de aplicações de realidade virtual caracterizam-se como tarefas complexas, devido à necessidade de integração de técnicas de diferentes áreas da computação e dispositivos não convencionais. Com o objetivo de aumentar o potencial de reutilização e compartilhamento de elementos de aplicações de realidade virtual, este trabalho propõe o RM-VRServices, um modelo conceitual de representação de aplicações de realidade virtual, e o VRServices, um modelo arquitetural para uma plataforma de software que apoia a produção, execução e compartilhamento de elementos de aplicações de realidade virtual em ambiente on-line. O RM-VRServices foi desenvolvido por meio da representação hierárquica de conceitos de mundos virtuais e aplicações de realidade virtual. A plataforma VRServices foi projetada com base no paradigma de computação orientada a serviços, com o objetivo de promover o compartilhamento de conteúdo, a interoperabilidade e a flexibilidade de acesso às funcionalidades da plataforma. O desenvolvimento de protótipos do modelo RM-VRServices e da plataforma VRServices, possibilitou a produção de aplicações de realidade virtual, em um ambiente on-line, acessível por meio de serviços, com interoperabilidade de linguagem de programação e plataforma computacional. / Virtual reality is used in the production of complex simulations of 3D virtual environments, involving nontrivial input and output devices, to provide users with sensations of immersion in the simulated world in real time. The design and development of virtual reality applications are characterized with complex tasks, due to the need to integrate techniques from different areas of computing and non-conventional devices. In order to increase the potential for reuse and sharing of elements of virtual reality applications, this work proposes the RM-VRServices, a conceptual model for representing virtual reality applications, and the VRServices, an architectural model for a software platform to support the production, implementation and element sharing of virtual reality applications in an online environment. The RM-VRServices was developed by using the hierarchical representation of virtual world concepts and virtual reality applications. The VRServices platform was designed based on the paradigm of service-oriented computing, with the goal of promoting content sharing, interoperability and flexibility of access to the features of the platform. The development of prototypes of the RM-VRServices model and the VRServices platform, enabled the production of virtual reality applications in an online environment, accessible through services, with interoperability of programming language and computing platform.

<p>Att designa en generell och utbyggbar mjukvara är inte enkelt, då det krävs en bred kompetens inom många olika områden. Vi belyser i detta arbete en del av problematiken kring design. Utgångspunkten är ett praktikfall vars målmiljö rör processer och integrationer. Huvudfokus ligger på designmönster, men även en bredare genomgång av ämnen så som utvecklingsmetodik, Service Oriented Architecture (SOA), Web Services (WS) och utvecklingsmiljöer presenteras. Arbetet bedrivs i enlighet med riktlinjer från Rational Unified Process (RUP) och slutprodukten är en checklista på tre punkter. De tre punkterna speglar de lärdomar vi dragit av arbetet genom saker vi gjort och saker vi borde ha gjort. God design kan uppnås genom att förstå den uppgift man åtagit sig, utvärdera sitt resultat och delresultat samt genom användandet av rätt verktyg. Framtida forskningsområden med anknytning till vårt rör förslagsvis metoders betydelse för mjukvarudesign, dynamiska perspektiv hos utvecklare och mer enhetlighet kring begreppet SOA.</p>

In the context of building software systems, Service-oriented Systems (SOS) have become one of the major research topics in the past few years. In SOS, services are basic functional units that can be created, invoked, composed, and if needed deleted on-the-fly. Since these software systems are composed of different services there is no easy way to assure the Quality of Service (QoS), therefore, formal specification of both functional and extra-functional system behaviour, compatibility, and interoperability between different services have become important issues. As a way to address this issues, resource-aware timing behavioural language REMES was chosen to be extended towards service-oriented paradigm with service specific information, such as type, capacity, time-to-serve, etc., as well as Boolean predicate constraints on control flow guarantees. In this thesis we present a design framework that provides a graphical user interface for behaviour modelling of services based on REMES language. NetBeans Visual Library API is used to display editable service diagrams with support for graph-oriented models. A textual dynamic service composition language was implemented, together with means to automatically verify service composition correctness. We ensure also an automated traceability between service specification interfaces, where both modelling levels are combined in an efficient tool for designing SOS.

<p>With the proliferation of Internet, ERP systems like all the domains of Information Technology have known an important evolution. This final thesis project is a study about the evolution of ERP systems, more precisely about their migration to the Web giving birth to a new generation of systems: the Web-Based or Web-enabled ERP systems. This migration to the Web is justified by the difficulty of making possible the communication between partner’s legacy systems and the organizations’ ERP systems. A historical evolution of these systems is presented in order to understand the reasons that lead vendors to adopt the Web Service Technology. Based on different studies, the main technologies such as Web services, Service-Oriented Architecture and Web Application server are also presented. From an interpretative research approach mySAP ERP has been chosen as a case study. This Master’s thesis has been led into AIRBUS France Company within the framework of the SAP Customer Competence Center (SAPCCC) Web site project. The project is aimed at re-building the SAPCCC Web site. The new characteristic of the Web site is to make it accessible by all AIRBUS partners working with SAP applications. To make the Web site accessible by the partners from their own applications located on their own platforms the development has been done thanks to mySAP ERP which is an ERP using the Web service technology. Finally, this thesis presents a comparative study between traditional ERP systems and the new generation of Web-based ERP systems.</p>

<p>This thesis emphasizes on investigating the relationship between the quality attributes and service oriented architecture (SOA). Due to quality attributes requirements drive the design of software architecture, it is necessary to maintain the positive quality of SOA and improve the negative quality of SOA. This thesis gives an introduction to SOA, Enterprise Service Bus (ESB) and MULE. Then, it covers information on quality of systems and tactics for achieving each quality attribute. Finally, we discuss the quality of SOA in detail, and illustrate how to set up a SOA and how to improve its quality using a case of an order for supermarket.</p> / Order system

<p>In this thesis we will identify which are the desired features and functionalities for implementing a system capable of acting as an information bridge for content available in the “wired” Internet to be delivered to mobile devices. We will also explore how to design and build such a system based on the specifications within parts of the MUSIS project. The MUSIS’ system development is used as a base of the work described in this thesis and the experiences from those efforts are used in order to design a system with more focus on data portability and media migration.</p><p>During the development of the MUSIS platform, problems related to system upgrading, i.e. adding new ad-hoc functionalities were discovered. Due to the fact that a user-centred design approach was taken, this was essential in the project. To solve some of these issues, we propose a new component-based system with a high level of scalability and re-usability. We name this system Collect, Convert and Send, CCS. The system shall be seen as a base that can be used as a core system for different projects where interoperability of content between different platforms, devices or systems is important.</p><p>The implementation of the system is based on the use cases and those theoretical aspects and ideas related to component software, interoperability, media migration and metadata in a Web service context. The results of our efforts give some indications that the use of component software gives a foundation for a service-oriented architecture.</p>

Thesis (MTech. degree in Software Development.)--Tshwane University of Technology, 2011 / With regards to extending component-based and service-oriented system development approaches and solving current problems related to enterprise systems, this study will explore the requirements and challenges of current enterprise systems, and define an SCSD (Service-oriented Component-based System Development) framework which would provide all-round service-oriented component-based support for a complex application environment. The purpose of this study is to create a novel SCSD framework which combines the features of both component-based and service-oriented paradigms, as well as avoid the weaknesses of the existing service and component combination approaches. The SCSD framework combines the re-usability of the component-based paradigm and the flexibility of the service-oriented paradigm. Reusable SCSD-based components and services can reduce costs, shorten development time, and improve service quality when implemented effectively. The SCSD framework offers an alternative to older system development approaches, while it also provides a new solution in order to establish relationships between services and components for current enterprise systems.

Daugėjant informacijos ir paslaugų kiekiui internete tradicinės elektroninio mokymo architektūros vis sunkiau patenkina iškylančius integracijos, išplėtimo, resursų valdymo poreikius. Nauja paslaugom orientuota architektūra, įgyvendinama žiniatinklio paslaugų technologijomis bei Grid aplinka yra tinkamas būdas efektyviam ir kokybiškam e-mokymui užtikrinti. Šiame darbe nagrinėjama kokias naujas galimybes e-mokymo srityje atveria paslaugom orientuota Grid architektūra. Tam kad būtų galima pasinaudoti naujomis galimybėmis turimą sistemą reikia modifikuoti. Pateikiamos rekomendacijos egzistuojančios interaktyvios e-mokymo taikomosios programos adaptacijai Grid paslaugų architektūrai. Šios rekomendacijos realizuoja esamą sistemą kaip paslaugą ar paslaugų rinkinį. Sudarytos rekomendacijos praktiškai išbandomos pritaikant realią nuotolinę testavimo sistemą Grid paslaugų aplinkai. Eksperimentinėje dalyje yra įvertinta nauda, kurią suteikia sistemos realizavimas Grid paslaugomis išplečiamumo, lankstumo bei pakartotinio panaudojimo požiūriu. / The increasing amount of information and services on the internet continues to grow, traditional e-learning architectures are unable to satisfy the need of integration, flexibility and resource management. The new service oriented architecture based on web services technologies and Grid environment is the effective and valuable way to develop e-learning. In this master thesis new e-learning opportunities based on service oriented Grid architecture are analyzed. In order to use new approaches the existing system has to be modified. Recommendations for the existing interactive e-learning applications adaptation for the service oriented Grid environment are presented. These recommendations implement the current systems as a service or set of services. The proposed recommendations are tested practically adapting the real distant assessment system for Grid service environment. The added value of this new approach is evaluated taking into consideration scalability, flexibility and reusability of Grid services in the experimentation part.

Service composition integrates existing services to fulfill specific tasks using a set of standards and tools. Existing service composition techniques and tools are mainly designed for SOA professionals. The business processes used in the service composition systems are primarily designed by experienced business analysts who have extensive process knowledge. Process knowledge is the information about a process, including the tasks in a process, the control flow and data flow among tasks. It is challenging for end-users without sufficient service composition skills and process knowledge to find desired services then compose services to perform their daily activities, such as planning a trip. Context-aware techniques provide a promising way to help end-users find services using the context of end-users. However, existing context-aware techniques have limited support for dynamic adapting to new context types (e.g., location, time and activity) and context values (e.g., “New York City”). To shelter end-users from the complexity of service composition, we present our techniques that assist non-IT professional end-users in service composition by dynamically composing and recommending services to meet their requirements. To acquire the desired process knowledge for service composition, we propose an approach to automatically extract process knowledge from existing commercial applications on the Web. By analyzing the context of end-users, our techniques can dynamically adapt to new context types or values and provide personalized service recommendation for end-users. Instead of requiring end-users to specify detailed steps for service composition, the end-users only need to describe their goals using a few keywords. Our approach expands the meaning of an end-user's goal using process knowledge then derives a group of tasks to help the end-user fulfill the goal. The effectiveness of our proposed techniques is demonstrated through a set of case studies. / Thesis (Ph.D, Computing) -- Queen's University, 2011-09-30 11:43:39.151

Systems of Systems (SoS) have received a lot of attention recently. In this thesis we will focus on SoS that are built atop the techniques of Service-Oriented Architectures and thus combine the benefits and challenges of both paradigms. For this thesis we will understand SoS as ensembles of single autonomous systems that are integrated to a larger system, the SoS. The interesting fact about these systems is that the previously isolated systems are still maintained, improved and developed on their own. Structural dynamics is an issue in SoS, as at every point in time systems can join and leave the ensemble. This and the fact that the cooperation among the constituent systems is not necessarily observable means that we will consider these systems as open systems. Of course, the system has a clear boundary at each point in time, but this can only be identified by halting the complete SoS. However, halting a system of that size is practically impossible. Often SoS are combinations of software systems and physical systems. Hence a failure in the software system can have a serious physical impact what makes an SoS of this kind easily a safety-critical system. The contribution of this thesis is a modelling approach that extends OMG's SoaML and basically relies on collaborations and roles as an abstraction layer above the components. This will allow us to describe SoS at an architectural level. We will also give a formal semantics for our modelling approach which employs hybrid graph-transformation systems. The modelling approach is accompanied by a modular verification scheme that will be able to cope with the complexity constraints implied by the SoS' structural dynamics and size. Building such autonomous systems as SoS without evolution at the architectural level --- i. e. adding and removing of components and services --- is inadequate. Therefore our approach directly supports the modelling and verification of evolution. / Systems of Systems (SoS) sind ein seit längerem bekanntes Konzept, das jedoch in letzter Zeit vermehrt Aufmerksamkeit erhielt. Das Hauptaugenmerk dieser Arbeit wird auf SoS liegen, die mit Hilfe von Techniken aus Service-Orientierten Architekturen erstellt werden. Somit vereinen die hier betrachteten SoS die Vorteile und Herausforderungen beider Paradigmen. SoS können definiert werden als Zusammenschlüsse einzelner, autonomer Systeme, die zu einem größeren System integriert werden. In diesem Zusammenhang interessant ist, dass die ehemals isolierten Systeme nach wie vor isoliert voneinander weiterentwickelt und gewartet werden. Desweiteren kommt der Strukturdynamik innerhalb des SoS eine beachtliche Bedeutung zu, da jederzeit Systeme dem SoS beitreten und es verlassen können. Zusammen mit der Tatsache, dass die Kooperationen zwischen den konstituierenden Systemen nicht immer beobachtbar sind, führt dies dazu, dass wir diese Systeme als offene Systeme bezeichnen. Wobei das System natürlich jederzeit eine klar definierte Grenze besitzt, diese aber nur durch ein Anhalten des Systems zu bestimmen ist. Dies jedoch ist, von einer praktischen Perspektive aus betrachtet, unmöglich. Häufig stellen SoS eine Kombination aus Softwaresystemen und pyhsikalischen Systemen dar mit der Folge, dass ein Fehler in der Software eine SoS schnell eine immense physikalische Wirkung entwickeln kann. Von daher fallen SoS leicht in die Klasse der sicherheitskritischen Systeme. In dieser Arbeit werden wir einen Modellierungsansatz vorstellen, der die Sprache SoaML der OMG erweitert. Die grundlegenden Konzepte dieses Ansatzes sind die Modellierung mit Kollaborationen und Rollen als Abstraktionsebene über Komponenten. Der vorgestellte Ansatz erlaubt es uns SoS auf einer architekturellen Ebene zu betrachten. Die formale Semantik unseres Modellierungsansatzes ist durch hybride Graphtransformationssysteme gegeben. Abgestimmt auf die Modellierung werden wir ebenfalls ein Verfahren zu Verifikation von SoS vorstellen, welches trotz der inhärenten Komplexität von SoS, diese zu verifizieren. Die Modellierung und Verifikation von Evolution wird von unserem Ansatz direkt unterstützt.