Providing reliable and efficient services are primary goals in designing a web server system. Data replication can be used to improve the reliability of the system. However, mapping mechanism is one of the primary concerns to data replication. In this paper, we propose a mapping mechanism model called enhanced domain name server (E-DNS) that dispatches the user requests through the URL-name to ...

In this work, we review the stochastic decomposition for the number of customers in M/G/1 retrial queues with reliable server and server subjected to breakdowns which has been the subject of investigation in the literature. Using the decomposition property of M/G/1 retrial queues with breakdowns that holds under exponential assumption for retrial times as an approximation in the non-exponential...

Protein contact map prediction is useful for protein folding rate prediction, model selection and 3D structure prediction. Here we describe NNcon, a fast and reliable contact map prediction server and software. NNcon was ranked among the most accurate residue contact predictors in the Eighth Critical Assessment of Techniques for Protein Structure Prediction (CASP8), 2008. Both NNcon server and ...

In this paper, we study an M/M/2 queueing system with balking and two heterogeneous servers, Server 1 and Server 2. Customers arrive according to a Poisson process and form a single waiting line. Two parallel servers provide heterogeneous exponential service to customers on a firstcome first-served basis. It is assumed that Server 1 is perfectly reliable and Server 2 is subject to breakdowns. F...

This paper deals with a retrial queueing system with a finite number of homogeneous sources of calls and a single non-reliable server, which means that the server is subject to random breakdowns depending on whether it is busy or idle. The failure of the server may block or unblock the systems’s operations and the service of the interrupted request may be resumed or the call can be transmitted ...

Substantiation and verification of the energy economic calculations for solar power plants require initial data experimental results. The paper proposes a device developed monitoring processing information from panel facility. facility aims to obtain reliable models designed assess resource indices used justify performance in eastern regions Russia. characteristics panels has additional capabil...

We present a protocol that enables mobile clients to be authenticated and authorized in data networks that are deployed in public places otherwise referred to as hotspots! The three key elements of a hotspot network are the mobile client, the hotspot server and the service provider. A mobile client is any device that can be used to access the internet. The hotspot server is a node in the data n...

Although testing is the mostpopular method for assuring sofrware quality, there are two recognized limitations, known as the reliable test set problem and the oracle problem. Fault-based testing is un attempt by Morell to alleviate the reliable test set problem. In this papec we propose to enhance fault-based testing to address the oracle problem as well. We present an integrated method that co...

Clinicians frequently underestimate or do not assess sleep-disordered breathing (SDB) in children in ambulatory surgical centers. Identifying the disorder and obtaining information relevant to anesthesia management can be assisted by the use of a standard questionnaire during preoperative assessment. We wanted to determine whether a preoperative screening tool increases clinician awareness of S...