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Survivability is crucial for computer systems that support critical infrastructures of our society. For those in paradigm of SOA where the computing settings are intrinsically open, traditional survivability model and safeguard mechanisms are no longer applicable. To rise to the challenge, we propose a formal definition and a corresponding framework to evaluate the survivability of SOA systems. We...
In Service Oriented Architecture, Quality of Service (Qos) represents an important issue which is often considered when selecting and composing services. For receiving up-to-date information, non-functional properties can be continuously monitored using current methods. Because of the occurrence of monitoring at every time of service calling, the current methods imposes some overhead on the SOA. The...
The following topics are dealt with: content-based image retrieval; mobile IP; ad hoc wireless networks; Internet routing scalability; wireless neutral access networks; service-oriented multi agent middleware; information fusion; MAC protocol; wireless sensor networks; QoS paradigm; file transfer service; mobile phones; avatars; virtual environments; VoIP; AQM routers; cloud SSO authentication; and...
To be successful a cloud service provider has to target a preferably large customer group to leverage economies of scale. Therefore an application offered as a service in the cloud is often configurable regarding non-functional qualities, such as location or availability. Since many of these qualities depend on the resources on which the service is hosted, a large number of computing environments...
Large-scale complex infrastructures are emerging as new computing platforms for the federation of world-wide mission critical systems over the Internet. However, standard approaches to data dissemination are still not adequate to the scale of these systems. The best-effort delivery guarantees of the Internet and the occurrence of node failures may compromise the correct and timely delivery of data,...
The overall Quality of Service (QoS) delivered by a system depends on the resources available to its constituting components. Achieving predictable QoS behaviour therefore requires a resource-aware component framework. Moreover, for applications that exhibit highly fluctuating loads and that have to compete for resources at runtime, the framework must also allow dynamic reconfiguration. The goal of...
Web services have emerged as a technology that aims at improving the communication between applications, through the service-oriented paradigm. Researches involving web semantics, ontology and composition of services has currently been developed. However, research in performance evaluating of web services architecture with quality of service support (QoS) is little widespread. Some works separately...
Distributed governance is the process for individual entities in the system to make autonomous decisions in response to special situations. It is an important principle in governing the actions in cyber physical systems to achieve operation responsiveness. In this paper, we extend the widely adopted service-oriented architecture (SOA) paradigm to build a distributed governance model in the context...
When using SOAs in mission critical environments, quality and performance related aspects may not be ignored. Service Level Agreements (SLAs) have to be defined and applied during runtime. In this paper we present a method to enhance an existing SOA container to take into account Quality of Service (QoS) related aspects and enforce these aspects during runtime using feedback controlled priority adaptations...
IP Multimedia Subsystem (IMS) known for its prominent service delivery is paving way for applications like Video Voice over IP (VVOIP) on handheld devices too. Android, a software platform from Google, pioneering in middleware and applications domain of handheld devices does not offer support for IMS services by design. Motivated by these observations, we present novel scalable architecture to cater...
Service Oriented Architectures enable markets of functionally equivalent service providers delivering services at different Quality of Service (QoS) and cost levels. Under these circumstances, there is a need for mechanisms to optimally select service providers at run-time to support a business process execution so that a utility function for the business process is maximized subject to QoS and cost...
Web service is a new paradigm of using the Web. One of the fundamental supports of the web service vision is a brokerage system that enables services to be published to a searchable repository and later retrieved by potential users. Automated Web service discovery is a key challenge in Service Oriented Architecture (SOA) research. There exist many web services which exhibit similar functional characteristics...
This paper introduces a novel method for the specification and selection of criteria-weighted operation modes for the orchestration of services in industrial automation using Petri nets. The objective is to provide to the internal decision support system of a service-oriented automation device or of another applicable computational system the capability to select the best path in a Petri net orchestration...
Computing has reached the time of distributed applications everywhere. Service-oriented architectures are more and more used to organize such complex and highly dynamic applications into business processes calling services discovered in registries at load-time. In this context, Quality of Service (QoS) and agility in business processes become key issues. Instead of binding business processes to services...
Sustainability is an important issue with a growing interest. Two ICT technologies provide useful support for the sustainability of industrial systems: service-oriented architecture (SOA) and cyber-physical systems (CPS). SOA has been adopted in a variety of industrial systems due to its integration flexibility and process composability. CPS is a new technology to bring computational intelligence...
Ubiquitous computing environments are becoming more heterogeneous and highly dynamic. Systems need to dynamically self-adapt in order to accommodate dynamically changing resources, needs of different users and failure events. This paper focuses on the runtime adaptation mechanisms that need to be dealt with the distributed nature of systems and the heterogeneity of the environment. We tackle the problem...
The move towards Network Enabled Capability (NEC) by the UK Ministry of Defence (MoD) is designed to achieve enhanced military effect through the networking and coherent integration of existing and future resources including sensors, weapon systems, and decision makers to achieve greater agility in the prosecution of military operations. One of the many challenges of realizing NEC is engineering systems...
In recent years, Service Oriented Architectures (SOA) have risen in use as an architectural style for distributed systems. They have many desirable features such as flexibility, software reuse and cost benefits. In addition to this, SOA enables and indeed encourages the binding of services at runtime in the form of dynamic binding. Here, services are bound to service requests at runtime and the choice...
Services composition technology provides a promising way to create a new service in services-oriented architecture (SOA). However, some challenges are hindering the application of services composition. One of the greatest challenges for composite service developer is how to select a set of services to instantiate composite service with quality of service (QoS) assurance across different autonomous...
The Service-Oriented Architecture (SOA) leverages the service abstraction to enable the development of modular, loose-coupled and distributed applications. In order to use such an architecture, service-based applications directly rely on services or compose them for conceiving new functionalities. In spite of these capabilities, they do not support the development of services which need high-performance...
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