Scalability of a low-cost, Intel Xeon-based, multi-Teraflop Linux cluster is tested for two high-end scientific applications: Classical atomistic simulation based on the molecular dynamics method and quantum mechanica...
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Scalability of a low-cost, Intel Xeon-based, multi-Teraflop Linux cluster is tested for two high-end scientific applications: Classical atomistic simulation based on the molecular dynamics method and quantum mechanical calculation based on the density functional theory. These scalable parallel applications use spacetime multiresolution algorithms and feature computational-space decomposition, wavelet-based adaptive load balancing, and spacefilling-curve-based data compression for scalable I/O. Comparative performance tests are performed on a 1024-processor Linux cluster and a conventional higher-end parallel supercomputer, 1184-processor IBM SP4. The results show that the performance of the Linux cluster is comparable to that of the SP4. We also study various effects, such as the sharing of memory and L2 cache among processors, on the performance.
A multidisciplinary, collaborative simulation has been performed on a Grid of geographically distributed PC clusters. The multiscale simulation approach seamlessly combines i) atomistic simulation based on the molecul...
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An application of the wavelet transform to electrocardiography is described in the paper. The transform is used as a first stage of a lossy compression algorithm for efficient coding of rest :ECG signals. The proposed...
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An application of the wavelet transform to electrocardiography is described in the paper. The transform is used as a first stage of a lossy compression algorithm for efficient coding of rest :ECG signals. The proposed technique is based on the decomposition of the ECG signal into a set of basic functions covering the time-frequency domain. Thus, non-stationary character of ECG data is considered. Some of the time-frequency signal components are removed because of their low influence to signal characteristics. Resulting components are efficiently coded by quantization, composition into a sequence of coefficients and compression by a run-length coder and a entropic Huffman coder. The proposed wavelet-based compression algorithm can compress data to average code length about 1 bit/sample. The algorithm can be also implemented to a real-time processing system when wavelet transform is computed by fast linear filters described in the paper. (C) 1997 Elsevier science Ireland Ltd.
An example of application of the wavelet transform to electrocardiography is described in the paper. The transform is exploited as a first stage of an ECG signal compression algorithm. The signal is decomposed into pa...
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An example of application of the wavelet transform to electrocardiography is described in the paper. The transform is exploited as a first stage of an ECG signal compression algorithm. The signal is decomposed into particular time-frequency components. Some of the components are removed because of their low influence to signal shape due to nonstationary character of ECG. Resulted components are quantized, composed into one block and compressed by a classical entropic Huffman coder. The wavelet transform with the threshold detector, the quantizer, and the Huffman coder can compress data with average compression ratio CR=9.2 and percentual root mean square difference PRD=3.0%. The lossy compression algorithm was tested on CSE library of rest ECG signals.
The authors consider the foundation of the courseware development environment to be a resource library. A large-scale, robust resource database with object-oriented subject classification and task-oriented access laye...
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The authors consider the foundation of the courseware development environment to be a resource library. A large-scale, robust resource database with object-oriented subject classification and task-oriented access layers can well address the needs of the main dimensions of courseware design. As a resource library it is to help in the selection and the design of representations, presentations and interactions. In addition to the created and curated object collections, a template library of presentations and interactions is an integral part of the proposed resource library. The courseware development process the authors followed consisted of the design and implementation of one building block in an imaginary, computer-based, interactive medical teaching system for patient education, a lecture on breast diseases. One result of the analysis of this process is a set of functional specifications for the first iteration of a local resource library. The resource repository (resource library) offers different functionalities during the different stages of courseware development.
The concept of the cultured neuron probe was induced by the possible selective stimulation of nerves for functional recovery after a neural lesion or disease. The probe consists of a micro-electrode array on top of wh...
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ISBN:
(数字)9783642554698
ISBN:
(纸本)9783540006374
The concept of the cultured neuron probe was induced by the possible selective stimulation of nerves for functional recovery after a neural lesion or disease. The probe consists of a micro-electrode array on top of which groups of neuronal cells are cultured. An efficient method to position groups of neuronal cells on top of the stimulation sites of the micro-electrode array is developed. With negative dielectrophoretic forces, produced by non-uniform electric fields on polarizable particles, neuronal cells are trapped. Experimental results and model simulations describe the trapping process and its effect on neuronal cell viability.
This book constitutes the thoroughly refereed post-conference proceedings of the Third International Conference on Scale Space Methods and Variational Methods in computer Vision, SSVM 2011, held in Ein-Gedi, Israel in...
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ISBN:
(数字)9783642247859
ISBN:
(纸本)9783642247842
This book constitutes the thoroughly refereed post-conference proceedings of the Third International Conference on Scale Space Methods and Variational Methods in computer Vision, SSVM 2011, held in Ein-Gedi, Israel in May/June 2011.;The 24 revised full papers presented together with 44 poster papers were carefully reviewed and selected from 78 submissions. The papers are organized in topical sections on denoising and enhancement, segmentation, image representation and invariants, shape analysis, and optical flow.
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