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In this paper, we propose an approach to select top-k cloud services. Our approach combines the trust, determined by the reputation of the provider, and the QoS. We present different algorithms for processing such selection queries and evaluate them through a set of experiments.
As more and more cloud services are provided on the web, composite services will increase exponentially. How to select the optimal services for a given composite service is a important problem and is NP-Hard. This paper proposes a multi-objective service selection algorithm based on MOACS(Multi-Objective Ant Colony System) optimization algorithm for this problem. In this problem, two objectives are...
Machine-to-machine (M2M) communications have emerged as a flourishing technology for next-generation communications, and are undergoing rapid development while inspiring numerous applications. However, unique features of M2M communications, such as the massive number of machine type devices (MTD) and delay sensitive applications require specific considerations. To enhance the communication efficiency...
Nowadays, as the various applications emerge, to address the problem of the end-to-end QoS guarantee in the heterogeneous networks is becoming more and more important. Considering the communication between two nodes within a domain or cross-domain in the heterogeneous networks, we design the scheme of Signaling of Cross-domain QoS Cooperation in heterogeneous networks (SCQC). In SCQC, the SSE nodes...
In the composite service which runs for a long time under the heterogeneous and loose-coupled circumstance, the failure of service tends to occur. The transaction and recovery mechanism is urgently needed in order to guarantee the end-to-end QoS of the workflow and satisfy the user requirement. In this paper we address the composite service recovery issue in the way of substitution with the consideration...
Nowadays, the exploding number of functionally similar Web services has led to a new challenge of selecting the most relevant services using quality of service (QoS) aspects. Traditionally, the relevance of a service is determined by computing an overall score that aggregates individual QoS values. Users are required to assign weights to QoS attributes. This is a rather demanding task and an imprecise...
During the execution of a QoS-aware service process, Web Services (WSs) may become faulty and cause the whole process to violate the predefined QoS constraints. Service processes need to adapt to the runtime faults so as to support reliable service-based applications. In this paper, we study the problem of runtime service process reconfiguration under end-to-end QoS constraints. An adaptive QoS-aware...
With the development of Web Service, it has become a key issue to select appropriate services from a large number of candidates for creating complex composite services according to users' different QoS levels requirements. However, the existing service selection algorithms have many defects such as high time complexity, non-global optimal solutions, and poor quality solutions. To solve these defects,...
How to repair a failed composite service with end-to-end constraints is a big concern for users. Just by replacing a failed atomic service may not solve the problem, due to constraints violation or unavailability of remote services (server crash down, network disconnect, and so on). In this paper we propose an approach for service replacement based on constraints partition in web service composition...
SOA based software is typically based on dynamic reconfiguration, since it is the composition of services. But few works focus on the non-functional reconfiguration of the SOA-based software. This paper presents an approach for QoS driven dynamic reconfiguration of the SOA based Software. The approach can reconfigure a SOA based software to comply with a new QoS constrains by replacing its individual...
In the DiffServ architecture, a queue buffer management algorithm-PARIO-C algorithm based on traffic prediction was proposed. The algorithm used Recursive Least Squares (RLS) method to predict the change of average queue length in the network, and combined Adaptive Random Early Detection (ARED) algorithm to adjust the parameter adaptively, thus achieved better control of network congestion. Experimental...
Distributed Virtual Environment (DVE) has attracted much attentions in recent years due to the rapid advances in the areas of E-learning, Internet gaming, human-computer interfaces, and etc. Meanwhile, in recent years, the emergence of Service Oriented Architecture (SOA) provides a more flexible and inter-operable framework for building more advanced DVE based applications. In such a background, service...
Web services can be composed together and interact with each other to carry out complex transactions or workflows. During the execution of an autonomic process, if one component service fails or becomes overloaded, a mechanism is needed to ensure that the running process is not interrupted and the failed service is quickly and efficiently replaced. This paper presents a novel Web services replacement...
WiMedia ultra wideband (UWB) MAC consists of distributed reservation protocol (DRP) and prioritized contention access (PCA), where DRP is used to reserve the medium for time division multiple access for isochronous and other traffic. This paper proposes an improved service interval-based medium access slot (MAS) allocation (ISIMA) algorithm for MAS allocation to support the quality of service (QoS)...
Grid computing has emerged as a global platform to support organizations for coordinated sharing of distributed data, applications, and processes. Furthermore, Grid computing has also leveraged Web services to define standard interfaces for grid services adopting the service-oriented view. Consequently, there have been significant efforts to enable applications capable of tackling computationally...
The flexibility and dynamism of service-oriented architecture (SOA) makes it critical to monitor and manage services behaviors at runtime for performance assurance. In this paper, two efficient evidence channel selection (ECS) algorithms are designed to select service run-time data collection locations for business process management. The design of ESC algorithms are based on the classic facilities...
An emergent modeling approach is proposed to the study of E-service workflow, which is inspired by the characteristics of emergence and self-evolution in biological neuroendocrine-immune network. E-services are represented by autonomous bio-entities (mobile agents with biological operation), The E-service workflow composition is achieved by the evolutionary community of the bio-entities. By understanding...
The advancement of mobile computing is mainly limited by battery lifetime of an end device, and thus power management is always a critical design issue in various wireless networks. To conserve power consumption of mobile subscribe stations (MSSs), three types of power saving classes are defined in the IEEE 802.16e standard. However, the defined power saving mechanism is per-connection basis. When...
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