An alternative analysis of the classical M/G/1 cyclic order polling model is presented. We introduce the new Markov regenerative process framework, which provides a way to perform the analysis of the polling model on a unified, i.e. service discipline independent way. We derive the decomposition property and the general expressions of the stationary number of customers as well as the stationary...

Presented is the vision of the authors on how diverse web services may be composed, mediated by dynamic task coalitions of agents performing tasks for service requestors. The focus and the contribution of the paper is the proposal of the layered web service mediation architecture. Middle Agent Layer is introduced to conduct service request to task transformation, agent-enabled cooperative task ...

Methods are developed for approximately characterizing the departure process of each customer class from a multi-class single-server queue with unlimited waiting space and the firstin first-out service discipline. The model is Σ(GI i / GI i )/1 with a non-Poisson renewal arrival process and a non-exponential service-time distribution for each class. The methods provide a basis for improving par...

For given external arrival process and given service-time distributions, the object is to determine the order of infinite-capacity single-server queues in series that minimizes the long-run average sojourn time per customer. We gain additional insight into this queueing design problem, and congestion in open queueing networks more generally, primarily by performing simulation experiments. We de...

KRONECKER REPRESENTATION AND DECOMPOSITIONAL ANALYSIS OF CLOSED QUEUEING NETWORKS WITH PHASE–TYPE SERVICE DISTRIBUTIONS AND ARBITRARY BUFFER SIZES Akın Meriç M.S. in Computer Engineering Supervisor: Assoc. Prof. Dr. Tuğrul Dayar June, 2007 This thesis extends two approximative fixed–point iterative methods based on decomposition for closed queueing networks (QNs) with Coxian service distributio...

In this paper, we introduce a task-based hybrid collaborative filtering (CF) recommender service to support users’ information gathering tasks. Even with the best web search engines (WSEs), and the most effective query formulations, information gathering tasks require people to work through long list of documents to determine potentially relevant documents. We propose and implement Singular Val...

reduced differental transform method (rdtm), which isone of the useful and effective numerical method, is applied to solve nonlinear time-dependent foam drainage equation (fde) with different initial conditions. we compare our method with the famous adomian decomposition and laplace decomposition methods. the obtained resultsdemonstrated that rdtm is a powerful tool for solving nonlinear par...

Abstract: This paper examines the steady state behavior of an M/G/1 queue with repeated attempts in which the server may provide an additional second phase of service. This model generalizes both the classical M/G/1 retrial queue and the M/G/1 queue with classical waiting line and second optional service. We carry out an extensive stationary analysis of the system, including existence of statio...

WS-BPEL is way to orchestrate web services. It defines business processes that interact with external entities through web service operations using WSDL. The existing system defines service flow using Web Services based on WSDL. We have proposed BPEL-TC, an extension to existing WS-BPEL which uses temporally customized Web Services as a model for process decomposition and assembly. WSDL-TC hand...

Fulfilling a service request in highly dynamic service environments may require deploying a service. Therefore, the effectiveness of service deployment systems affects initial service response times. On Infrastructure as a Service (IaaS) cloud systems deployable services are encapsulated in virtual appliances. Services are deployed by instantiating virtual machines with their virtual appliances...