background: with increased use of computers, exposure to electric and magnetic fields is increasing, the main objective of this study was to evaluate the electric and magnetic field strength in portable computers (laptops) and its relation with eyestrain users. methods: in this cross – sectional study, magnetic and electric fields in 125 laptop computers were measured from 30 cm and 50 cm dista...

(SSI) in a workstation cluster. In a cluster of computers, local area networks or highbandwidth switch networks using optical fibers physically connect a collection of node computers. The workstations in a cluster can work collectively as an integrated computing resource—that is, an SSI—or they can operate as individual computers, separately. Present clusters are usually small and provide only ...

We design and implement a high availability parallel run-time system---ChaRM64, a Checkpointbased Rollback Recovery and Migration system for parallel running programs on a cluster of IA-64 computers. At first, we discuss our solution of a user-level, single process checkpoint/recovery library running on IA-64 systems. Based on this library, ChaRM64 is realized, which implements a user-transpare...

The parallelization of complex planning and control problems arising in diverse application areas in the industrial, services and commercial environments not only allows the determination of control variables in the required times but also improves the performance of the control procedure as more processors are involved in the execution of the parallel program. In this paper we describe a sched...

In this paper, a methodology to exploit legacy sequential libraries on a multicomputer is shown. The process of integrating such libraries is exposed as a slave pool design pattern. The proposed solution is implemented using the concurrent functional programming language Erlang, and it has been applied to extend a C++ sequential XSLT library to perform clustered XSLT processing on a Beowulf, wh...

Creation of systems of the distributed calculations is the new perspective tendency of development of computing systems. As uniform definition of a computing cluster does not exist, for simplification of the further statement we shall accept some terminology which will reflect the described properties of a hardware and software platforms essential from the point of view of development of applie...

Cluster computing is presently a major research area, mostly for high performance computing. The work herein presented refers to the application of cluster computing in a small scale where a virtual machine is composed by a small number of off-the-shelf personal computers connected by a low cost network. A methodology to determine the optimal number of processors to be used in a computation is ...

It has been designed, built and executed a code for the Fast Fourier Transform (FFT), compiled and executed in a cluster of 2n computers under the operating system MacOS and using the routines MacMPI. As practical application, the code has been used to obtain the transformed from an astronomic imagen, to execute a filter on its and with a transformed inverse to recover the image with the variat...

Monte Carlo cluster update algorithms are extremely eecient for simulating spin models near their phase transitions, where local update algorithms suuer severe critical slowing down. Unfortunately, as the cluster algorithms are highly irregular as well as non-local, they are much more diicult to parallelize eeciently. The main diiculty lies in identifying which spins belong to which cluster. In...