Hercules X-1 (Her X-1) light-curve dips are analysed using the entire set of Rossi X-ray Timing Explorer/Proportional Counter Array observations archived over nine years. 370 new dips are found in 35 different 35-d cycles. This is the largest record of Her X-1 dips acquired as a result of a single study and by the same satellite, and includes 20 post-eclipse recovery dips, over 100 short-high-s...

Achieving processor cooperation in the presence of faults is a major problem in distributed systems. Popular paradigms such as Byzantine agreement have been studied principally in the context of a complete network. Indeed, Dolev [J. Algorithms, 3 (1982), pp. 14-30] and Hadzilacos [Issues of Fault Tolerance in Concurrent Computations, Ph.D. thesis, Harvard University, Cambridge, MA, 1984] have s...

In this article, a parallel computer program is implemented, based on Finite Element Method, to speed up the analysis of hollow circular cylinders, made from Functionally Graded Materials (FGMs). FGMs are inhomogeneous materials, which their composition gradually varies over volume. In parallel processing, an algorithm is first divided to independent tasks, which may use individual or shared da...

Due to the heterogeneity of network processor architectures and constantly evolving network applications, it is currently a challenge to compare or evaluate network processors. In this paper, we present principles of a benchmarking methodology that aim to facilitate the realistic evaluation and comparison of network processors. A key aspect of our approach is the separation of function, the env...

A parallel simulator, based on the Dual Site-Bond Model of complex media, is developed to study Hg intrusion and extrusion processes in the myriad of voids contained in a porous network. In order to reduce the requirements in RAM and computing resources, the porous network is partitioned into several sub-networks distributed in different cluster processors. The simulator uses shared memory to p...

A performance evaluation of a crossbar network is presented using discrete-time Markov chain (MC). Identical processors, totally synchronized with system clock and communicating through common memory modules. Simple MC models the behavior of each processor. We have developed state and output equations for discrete-time state space model. The transition probabilities of transition matrices are c...

We study the performance of inter-process communication on four high-speed multiprocessor systems using a set of communication benchmarks. The goal is to identify certain limiting factors and bottlenecks with the interconnect of these systems as well as to compare between these interconnects. We used several benchmarks to examine network behavior under different communication patterns and numbe...

In this short paper we consider the equivalence between various load-scheduling policies and continuous time Markov chains. It provides a basic unification of both divisible load scheduling and Markov chains for the first time in 15 years of research. This unification is suggested by the fact that both divisible load scheduling theory and Markovian queueing theory have common features. I. Backg...