In most queueing systems the server may be subjected to lengthy and unpredictable breakdowns while serving a customer. For instance, in manufacturing systems the machine may breakdown due to malfunction or job related problems; in computer systems, the machine may be subject to scheduled backups and predicted failures. In these systems, server breakdown results in a period of server unavailabil...

Dense linear algebra computations such as matrix factorization require the technique of`block-partitioned algorithms' for their eecient implementation on memory-hierarchy processors. For scalar-based distributed memory multiprocessors, the register, cache and oo-processor memory levels of the memory hierarchy all aaect the optimal block-partition size for such algorithms. Most studies on matrix...

This study investigates a random N-policy Geo/G/1 queue with startup and closedown times. N is newly determined every time a new cycle begins. When random N customers are accumulated, the server is immediately turned on but is temporarily unavailable to the waiting customers. It needs a startup time before starting providing service. After all customers in the system are served exhaustively, th...

In this paper a new method for the detection of broken rotor bars in induction machines is introduced. The startup transient current of an induction machine is used as the medium for diagnoses. The fundamental component is extracted using an algorithm that predicts the instantaneous amplitude and frequency during startup. The residual current is then analyzed using wavelets and a comparison is ...

Project JXTA is an open-source effort to specify the standard protocols for peer-to-peer communication and collaboration. This paper proposes a JXTA performance model and presents results obtained by benchmarking the JXTA 1.0 reference implementation in Java. This study focuses on the performance evaluation of typical peer operations and consequences for the peer network, the user and the devel...

In this paper, we present the design, implementation, and evaluation of a novel endpoint congestion control system that achieves near-optimal performance in all likely circumstances. Our approach, called the Probe Control Protocol (PCP), emulates network-based control by using explicit short probes to test and temporarily acquire available bandwidth. Like TCP, PCP requires no network support be...

Plasmatron fuel converters have been investigated for the conversion of a wide range of fuels. This paper is one of a series of paper investigating the performance of plasmatron methane reformers. In this paper a systematic experimental investigation is carried out of the reformation of methane in a plasmatron fuel reformer at steady state conditions. The effect upon reformation of flow rate di...

As the sizes of high-end computing systems continue to grow to massive scales, efficient bootstrapping for distributed software infrastructures is becoming a greater challenge. Distributed software infrastructure bootstrapping is the procedure of instantiating all processes of the distributed system on the appropriate hardware nodes and disseminating to these processes the information that they...