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There exist so many web services that share same or similar functional properties, so it is often a challenging effort to select a credible and optimal web service based on their various history QoS records. In view of this challenge, in this paper, a novel QoS-aware web service selection method is put forward, based on credibility evaluation associated with negotiated QoS dimensions. More specifically,...
This article describes how the service-oriented approach could be adopted to the automation environment. The concept of services could be used to classify services of large, heterogeneous systems. One of the main aspects of services is the dynamic assignment and usage at runtime. Taking this into account, dynamic, flexible and scalable systems could be designed. It is shown how the hardware-related...
The increasing complexity of networked embedded systems (NES) brings in the vision of large-scale systems made of subparts with decoupled interaction. In highly decoupled environments, it is required to introduce software paradigms that adjust well to this degree of independence among subsystems. In modern NES, real-time properties and reconfiguration facilities are not only an added value but an...
This paper first presents a novel model for QoS-aware web services composition based on workflow patterns, and an executing path tree with probability. Then a discrete PSO algorithm is proposed to fit our model, which also requires some other preliminary algorithms, such as the generation of all reachable paths and executing path tree. The experiments show the performance of that algorithm and its...
Modern distributed real-time systems (DRTS) are typically formed by several heterogeneous networked devices. Sometimes these devices must adapt to dynamic environments in which devices may join or leave the network and must respond in run-time to changing requirements ensuring certain levels of QoS. These characteristics yield to systems that are intrinsically complex to develop, test and maintain...
Large scale Service Oriented Architecture (SOA) developments are becoming increasingly reliant on registry services that manage Web Services using taxonomic attributes. At present a registry stores a Web Services interface definition and protocol bindings in WSDL, along with one or more XML schema files that define the structure of a SOAP message exchanged between Web Services operations and client...
Software as a Service (SaaS) providers enable the on-demand use of software, which is an intriguing concept for business and scientific applications. Typically, service level agreements (SLAs) are specified between the provider and the user, defining the required quality of service (QoS). Today SLA aware solutions only exist for business applications. We present a general SaaS architecture for scientific...
Service Oriented Computing is being widely accepted as an effective paradigm for developing applications by using already developed services. Services can be developed by different developers and be subscribed by different service consumers. Because of the loosely coupled nature, Service-based applications can be typically highly dynamic and unstable. That means services can be moved, deleted, and...
Service-Oriented Computing reveals features which are not commonly found in conventional computing paradigms; loose coupling, dynamism, blackbox, evolvability, and heterogeneity. These features make diagnosing and healing faults found in deployed services and service-related elements more challenging than managing conventional systems. Hence, service-oriented systems management often results in problems...
While the increasingly e-commerce provides enormous opportunities, it presents potential threats and risks because of lack of trust as well. Various trust management polices are proposed to improve these issues. However, most of these existing approaches only take into account a global attribute. The evaluation granularity is too coarse for customers to make an exact transaction decision. This paper...
Recently, as an important way of software applications, web services technology developed rapidly. As many web services provide the same functionality, quality of service (QoS) has become an important criterion for service selection. However, the QoS value provided by service provider is being tested in an ideal runtime, regardless of the effect of the actual load and different service time. This...
A Cyber-Physical System (CPS) is defined as integrations of computation and physical processes. In CPS, downsized embedded devices monitor and manage the physical process. Mobile Internet Device (MID), as a portable handheld device designed for mobility providing a down-graded computing capability, can be used as a strong candidate for client-side devices in CPS. Since these physical devices have...
As a new computing paradigm, Cloud computing has been advocated by IT industry and academia. It can provide lots of services, however, how to manage these services and guarantee the quality of service, has become one of the key factors for the development of Cloud computing. This paper proposes a hierarchical architecture model of Cloud services resources management and monitoring by integrating the...
In the System View of C4ISR Architecture, the military resource systems were tightly coupled and hard to adapt to the dynamic changement of operational process within Operational View. This paper presents a service oriented C4ISR Architecture Framework and prescribes the formalized description of service view. In the future integrated joint operation, C4ISR system which federates systems, sensors...
As a new form of software, the technique and standard of web services are grown to perfection day by day. However, application of web services is restricted by complex factors such as lack of user interface and effective QoS guarantee. As a result, it hasn't been used widely, which makes it necessary to provide an excellent platform to share web services resource the common people. Furthermore, since...
Service composition is a new paradigm for efficient and cost-effective IT service provisioning over the network. To safely and effectively deploy composed services within an organization or among multiple domains, one must be able to specify and enforce a variety of constraints such as those derived from legal regulations, Quality of Service (QoS) requirements and privacy and security policies. In...
This paper describes how to simultaneously support both dynamic policies and separation of concerns when developing an SOA application. We propose the DPSL (dynamic policy specification language) for managing and controlling the QoS according to the dynamic behavior of the workflow in SOA. The operation model is compatible with existing SOA standards, such as the WSDL, WS-Policy, WS-SecurityPolicy,...
In a distributed service-oriented computing environment, service consumers like to obtain guarantees related to services which they use provided by web service provider. Web service agreement specification is to define a language and protocol for advertising the capabilities of service providers. As the current version of web service agreement can not provides enough semantic expression. This work...
The advancement of large scale computing (LSC) has been driven not only by the continuous improvement in hardware infrastructures but also by the development of software paradigms including the introduction of Service Oriented Architecture (SOA). Grid computing is one area of LSC that has seen a focus in the attempt to infuse SOA technology to implement grid services. The decomposition of applications...
In solving the problem of heterogeneous systems in enterprise, this paper brings forward information exchange solutions of service-oriented architecture based on ESB centralized management to services, the scenario adopts services gateway interface design patterns and introduces efficient service scheduling algorithm, it achieves the decoupling between service packages and service communication, and...
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