INTRODUCTION Contemporary ophthalmology knows many methods of measuring intraocular pressure, namely the methods of non-contact and impression applanation tonometry. In non-contact applanation tonometers, e.g. the Corvis, the corneal flattening is caused by an air puff. Image registration of the corneal deflection performed by a tonometer enables to determine other interesting biomechanical par...

We investigate the parallelization of an algorithm on three very different architectures. These are: a 128-processor Cray XMT massively multithreaded machine, a 16-processor IBM x3755 shared memory machine and a 240-core NVIDIA FX 5800 graphics processor unit (GPU). The problem we use in our investigation is the wellknown subset-sum problem. While this is known to be NP-complete, it is solvable...

Background The virtual microscopy is a discipline that emulates the interaction between an expert with a microscopical sample upon a high resolution digital slide [1]. This type of technology is used for medical training and medical education, but so far it has been exclusively used in research environments because of the large computational requirements [2]. For instance, after digitizing 1cm2...

SUMMARY We present several preconditioned conjugate gradient methods for the iterative solution of the linear, symmetric systems of equations arising from the nite element method in displacement form, both for the h-version and the p-version. The preconditioners are based on a decomposition of the solution space into overlapping subspaces and solving separately on each subspace. A judicious cho...

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A $2k computer can execute about 8k transactions per second. This is 80x more than one of the largest US bank’s 1970’s traffic – it approximates the total US 1970’s financial transaction volume. Very modest modern computers can easily solve yesterday’s problems. 1. A Thousand-Transactions-per-second was once difficult and expensive. In 1973, Bank of America wanted to convert their paper-based b...

RISC stands for " Reduced Instruction Set Computer ". On RISC architectures the instruction length is constant, e.g. 32 bit on a SPARC. For a given instruction opcode there are certain bits which encode the opcode and others which encode the parameters. This makes point mutations conserving syntactic closure straight−forward. Parameters of an instruction can be changed by only modifying the bit...

The reconstruction of in-beam PET data acquired during the therapeutic irradiation with heavy ions at GSI Darmstadt requires high computational power since the PET images have to be available as shortly as possible after finishing a fractionated irradiation, however, at the latest before applying the next daily dose fraction. Furthermore, the number of patients treated per day (up to 15) increa...