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When a business process fails to deliver the quality of service (QoS), it is necessary to identify the faulty services that cause the problem. In this paper, we present a framework for diagnosing QoS problems in SOA. A set-covering algorithm is used to select the locations of run-time service data collection, or probes. The framework then creates a dependency matrix to denote the relationships between...
QoS (Quality-of-Service) has become a critical issue to guarantee the performance of service oriented systems (SOS). However, efficient ways to build SOS with required QoS are still being developed. In most cases of SOS, developers are more concerned on the service functionalities than QoS. In this paper, we propose a QoS-driven service composition approach to efficiently build SOS with optimal QoS...
In this paper, we introduce an IP multimedia sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of service oriented architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network...
Since the Internet of Services (IoS) is becoming reality, there is an inherent need for novel service selection mechanisms, which work in spite of large numbers of alternative services and take the user-centric nature of services in the IoS into account. One way to do this is to incorporate feedback from previous service users. However, practical issues such as trust aspects, interaction contexts...
Large Service Oriented Architectures (SOAs) have to fulfill qualitative and quantitative requirements. Usually Service Level Agreements (SLAs) are defined to fix the maximal load the system can accept and the minimal performance and dependability requirements the system has to provide. In a complex SOA where services use other services and thus performance and dependability of a service depend on...
This paper presents an active QoS infrastructure of wireless sensor networks (WSN), named QISM, which is based on middleware and service-oriented. The design, structure, important modules and working processes are discussed. The important characteristics of QISM include the active regulation mechanism based on feedback and negotiation between applications and network, the architecture based on middleware...
With the widespread of Web services (WS), more deployed services are being registered into a services registry, consequently giving rise to a series of problems. A conspicuous one is the large amount of functionally equivalent Web services returned by a service registry. A plausible solution is to involve QoS (quality of service) in the services discovery. However, some existing QoS-based discovery...
One of the major challenges faced by the Web services platform is how to compose a more appropriate new value added web service according to the user's requirements and preferences, and adapt it at runtime. To this end, we suggest in this paper a QoS-oriented approach to build more efficient composite web services and personalize this composition on-the-fly by taking into account user context, requirements,...
Nowadays, using Service-Oriented Architectures (SOA) is spreading as a flexible architecture for developing dynamic enterprise systems. Due to the increasing need of high quality services in SOA, it is desirable to consider different Quality of Service (QoS) aspects in this architecture as security, availability, reliability, fault tolerance, etc. In this paper we investigate fault tolerance mechanisms...
Web services is a service-oriented architecture of Web-based standard software components, while the agent is intelligent software entity which has its own ability to achieve its designed goals in a heterogeneous environment. In order to improve the qualities of Web services, this paper introduced a QoS module to Web services and proposed agent Web services system (AWSS) for the composition of Web...
The discovery of Web services for a specific request is one of the central operations in SOA, and research on semantic Web services (SWS) aims to achieve the automation of this step. This paper presents an enhanced goal-based approach for semantic Web service discovery based on rich functional and non-functional descriptions. We distinguish goal templates and goal instances, the previous are generic...
In order to improve the scalability, reliability and stability of the semantic Web service composition system, and to achieve ontology-based semantic Web services composition efficiently, this paper presents a P2P-based Semantic Web services (P2PSWS) composition system architecture. This architecture combines the advantages of centralized and decentralized structures. It distributes the functions...
This article describes middleware by adopting a horizontal and a vertical layer views. Middleware are enabling technologies for application development and execution in ubiquitous environments. In the horizontal view, we find most types of middleware developed so far, such as MOM, ORB, databases middleware and more recently SOA. Two new concepts emerged in this category, the ``middleware of sensors"...
A fundamental problem that confronts SOA-based CSCW applications is the efficient and timely QoS information obtainment of component services. However, this issue has largely been overlooked. This paper presents a P2P based publish/subscribe service to disseminate new revised QoS information reliably and efficiently. Specialized rendezvous points and a replica mechanism are introduced to reduce the...
Automated composition and optimization of workflows in Service Oriented Computing (SOC) is a challenging research area. However, there are numerous problems yet to be completely resolved, such as: How to automate the solution in a service oriented environment with redundant services competing with each other? How to formally quantify the performance metrics based on user requirements both at the task...
Enterprise Service Bus (ESB) is a promising tool to solve the problem of service composition at the background of service integration. Traditional ESB is not efficient enough for dynamical composition; and do not have the coordinative distributed execution feature, which can provide both effective and rapid service composition. This paper proposes a Coordinative Service Bus based Execution Platform...
Faced with intense competition, network service providers, supported by their respective network operations centers (NOCs), must ensure the best possible quality of service (QoS) and corresponding quality of experience (QoE) for end-users or face the loss of business. QoE represents the perception of quality experienced by end-users of a real-time system, such as VoIP. The QoE challenge becomes significant...
With the increasing size and complexity of emerging military communication networks, low footprint emulation methods are required to evaluate protocols, algorithms and user performance. In this paper we describe a new emulation architecture that is scalable, modular, and responds to real-time changes in topology and link characteristics. We use this scalable emulation testbed to evaluate system performance...
In a service-oriented architecture, how to analyze the feasibility of service composition according to the requirements of service consumers has become a problem that must be solved in service composition. A method for analyzing feasibility of requirement driven service composition is proposed. Based on the support function at different stages in the lifecycle of service composition, the composition...
The current business challenge and solution supported by EERP (end-to-end resource planning) is presented in this paper. The relevant technologies about SOA and semantic SOA to realize EERP have been researched in detail. An approach based on semantic SOA and component oriented technologies for EERP has been proposed and applied, which can help to realize business-goal-driven dynamic semantic integration...
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