Array processors

The ST-100 is not a typical array processor. Figure 1 shows the data flow through the functional units of the machine for a routine application. There are seven main functional units (1)... 

Water Potentials. The ST2 (23), MCY (24), and CF (2J5) potentials are computationally tractable and accurate models for two-body water-water interaction potentials. The ST2, MCY and CF models have five, four, and three interaction sites and have four, three and three charge centers, respectively. Neither the ST2 nor the MCY potentials allow OH or HH distances to vary, whereas bond lengths are flexible with the CF model. While both the ST2 and CF potentials are empirical models, the MCY potential is derived from ab initio configuration interaction molecular orbital methods (24) using many geometrical arrangements of water dimers. The MCY+CC+DC water-water potential (28) is a recent modification of the MCY potential which allows four body interactions to be evaluated. In comparison to the two-body potentials described above, the MCY+CC+DC potential requires a supercomputer or array processor in order to be computationally feasible. Therefore, the ST2, MCY and CF potentials are generally more economical to use than the MCY+CC+DC potential. 

McDonough, 1972] McDonough, R. (1972). Degraded performance of nonlinear array processors in the presence of data modeling errors. J. Acoust. Soc. Am., 51 1186-1193. 

Glinski and Roe, 1994] Glinski, S. and Roe, D. (1994). Spoken Language Recognition on a DSP Array Processor. IEEE Trans, on Parallel and Distributed Systems, 5(7) 697-703. 

All broadband spectra were amplified by a low-noise preamplifier with a dynamic range > 1,000, and a broadband main amplifier. The amplified time-domain signal is digitized by a 20 MHz, 9 bit Bruker ADC with 128 K words of buffer memory, and Fourier transformed by a Bruker array processor (128 K word FFT in 8 sec). 

Array Processor Computer circuit designed for performing fast... 

Loh, W. W., Array processor for use in electrical impedance tomography. MSc Thesis UMIST... 

Terence Wilson, Chemical Searching on an Array Processor, Research Studies Press, Somerset, UK, 1993. 

The CRAY-1 vector processing computer at the Science Research Council s (S.E.R.C) Daresbury Laboratory, is at the centre of a network providing large scale computational facilities for Universities in the United Kingdom. This is the only supercomputer available at present to Quantum Chemists in the U.K., and this article will therefore be restricted to experience gained on the CRAY-1, although this experience will undoubtedly be relevant to future applications on machines such as the ICL Distributed Array Processor (DAP) (see reference (2) for a detailed description) and the CDC Cyber 203/205. 

It must be pointed out these considerations are highly dependent on the nature of the computation. In the particular problem reported here the extent of array processing is the overriding feature that makes these economies possible. The size of the arrays in relation to the hardware is also important. Experience has shown that it takes the equivalent of about four executions of a DO-loop to set up the array processor, and that the maximum number of array elements which can be processed without incurring additional overhead is 64. 

Traditionally the vector feature has been the sole property of large scale supercomputers. With the advent of array processors, however, this important feature is becoming available to minicomputer users also. 

VAX 11-70 with attached Floating Point Systems Array Processor... 

Agglomerative Clustering Using the ICE Distributed Array Processor. 

Classification of Chemical Structure Databases Using a Highly Parallel Array Processor. 

M. P. Allen, Theor. Chim. Acta, 84, 399 (1993). Simulation of Condensed Phases Using the Distributed Array Processor. 

Narrow band filters 410,5 and 4S0,5 nrn Xenon [UV light source 60286 computer OT-2861 frame grabber OE-7020 array processor... 

All spectra were run on a Digilab FTS-10 FTIR system equipped with fast-scan capabilities, a Hycomp 32 data array processor, and a nitrogen-cooled mercury-cad-mium-telluride detector. Transmission spectra were obtained using CaF2 windows with a 6- xm spacer. For each transmission spectrum, 500 scans were co-added at 4-cm-1 resolution. Smoothing was not needed on these spectra. All the spectra in this chapter (both transmission and ATR) are subtracted spectra, that is, they are the resultof subtracting a saline (H20) spectrum from the spectra of the aqueous protein solutions. 

We thank Dale L. Bodian and Brian K. Shoichet for their help. We thank the Computer Graphics Laboratory (supported by National Institutes of Health RR-01081) for use of their facilities for parts of this project. Partial support was received from the National Institutes of Health GM-31497 (IDK) GM-39552 (IDK), GM-07175 (GLS), and GM-29072 to Peter Kollman. The Floating Point Systems 264 array processor was purchased with grant support from National Science Foundation DMB-84-13762 and National Institutes of Health RR-02441. Assistance from the Macromolecular Workbench supported by the Defense Advanced Research Projects Agency under contract N00014-86-K0757 administered by the Office of Naval Research is also appreciated. 

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