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REAL-TIME DIGITAL PROCESSING OF BLOOD-PRESSURE AND HEART-RATE DATA OF TETHERED NONHUMAN-PRIMATES

REAL-TIME DIGITAL PROCESSING OF BLOOD-PRESSURE AND HEART-RAT...

28TH ANNUAL ROCKY MOUNTAIN BIOENGINEERING SYMP / 28TH INTERNATIONAL SYMP OF THE INSTRUMENT SOC OF AMERICA : BIOMEDICAL SCIENCES INSTRUMENTATION

作者： MARINEZ, YN COMEAUX, PJ COOPER, TE SHADE, RE United States

ISBN: (纸本)1556173083

To facilitate data analysis, we developed a computerized system for collecting and screening systolic, diastolic, and mean arterial blood pressure, and heart rate data. Each value is tested for acceptability (filtered), in real-time, by a computer algorithm. Level one, spike detection, is performed by independently comparing each datum to specified upper and lower limits. Level two, damping detection, is applied to data which passed level one and is categorized as mild, severe, or none. We monitored 69 tethered conscious baboons for approximately eight 12-hour overnight periods to obtain 23,433,000 one-second data points per variable. The computerized system eliminated approximately 65% of unacceptable data and highlighted problems, thus reducing the time required to inspect digital files or analog hard-copy recordings. No acceptable data were rejected by the filter and all data rejected by the filter also were unacceptable by data inspection.;To facilitate data analysis, we developed a computerized system for collecting and screening systolic, diastolic, and mean arterial blood pressure, and heart rate data. Each value is tested for acceptability (filtered), in real-time, by a computer algorithm. Level one, spike detection, is performed by independently comparing each datum to specified upper and lower limits. Level two, damping detection, is applied to data which passed level one and is categorized as mild, severe, or none. We monitored 69 tethered conscious baboons for approximately eight 12-hour overnight periods to obtain 23,433,000 one-second data points per variable. The computerized system eliminated approximately 65% of unacceptable data and highlighted problems, thus reducing the time required to inspect digital files or analog hard-copy recordings. No acceptable data were rejected by the filter and all data rejected by the filter also were unacceptable by data inspection.

关键词： BLOOD PRESSURE computer algorithm DIGITAL PROCESSING BABOON

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Optical coherence tomography: Interpretation artifacts and new algorithm

Optical coherence tomography: Interpretation artifacts and n...

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Medical Imaging 2004 Conference

作者： Bartsch, DU Gong, X Ly, C Freeman, WR Univ Calif San Diego Shiley Eye Ctr Retinal Imaging Lab La Jolla CA 92093 USA

ISBN: (纸本)0819452831

Purpose: To study the frequency and severity of artifacts in optical Coherence tomography images and to develop a new algorithm for improved retinal thickness detection. Methods: We propose a new method to measure the retinal thickness in OCT scans. We compared our modified edge detection (MED) method to the Markov method and the conventional OCT algorithm (cOCT) in 226 OCT macular scans. Results: We defined errors as a difference in detected interface location of less than 100 mum offset for less than 10 A-scans, otherwise it was an artifact. The frequency of errors was reduced from 32% (cOCT) to less than 2% with the MED method, while the Markov method had a frequency of 5%. Artifacts were reduced from 9.3% (cOCT) to 0.9% (MED) while the Markov method had a frequency of 11.5%. Conclusion: The results show the MED method of detecting retinal thickness is superior to the other two methods, since the OCT method is prone to both errors and artifacts and the Markov method is robust only to healthy retina. Our MED method is robust for detection of normal retinas and effective even in eyes with pathological conditions. Use of improved retinal thickness detection algorithm should significantly improve clinical utility of the optical coherence tomograph.

关键词： optical coherence tomography computer algorithm artifacts

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A pattern search algorithm for feedback-control system parameter optimization

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IEEE Transactions on computers 1972年第11期C-21卷 1222-1227页

作者： Lange-Nielsen, Truls Lance, George M. Forsvarets Forskningsinstitutt Kjeller Norway Department of Mechanical Engineering University of Iowa Iowa City Iowa 52240 United States

The problem of parameter optimization for the purpose of synthesis and design of feedback control systems is considered. A flexible performance index, which permits direct consideration of performance specifications such as rise time, settling time, peak overshoot, and bandwidth, in addition to the usual analytic forms, is developed and adapted to a modified version of Rosenbrock's pattern-search algorithm. Modifications of Rosenbrock's method include: 1) scaling of parameters to ensure coordinate orthogonalization;and 2) employing variable step sizes at the beginning of each new stage, the steps being a function of previous failures and successes. The efficiency of each stage is thus improved and the sensitivity to initial estimates of step size is reduced. A stopping criterion for the search based on a given number of consecutive stages with no improvement of the performance index (within the precision of the computer) is shown to be effective. Calculation of sensitivity numbers and desired performance specifications around the optimal point are included to give a feel for system behavior near optimal condition. The IBM/360 continuous system modeling program (CSMP) is employed, permitting system simulation directly from a block diagram. Copyright © 1972 by The Institute of Electrical and Electronics Engineers, Inc.

关键词： computer algorithm control optimization pattern search systems

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Computing the Kekule structure count for alternant hydrocarbons

Computing the Kekule structure count for alternant hydrocarb...

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Annual Meeting of the Fock-School on Quantum and Computational Chemistry

作者： Torrens, F Univ Valencia Inst Univ Ciencia Mol E-46100 Valencia Spain

A fast computer algorithm brings computation of the permanents of sparse matrices, specifically, molecular adjacency matrices. Examples and results are presented, along with a discussion of the relationship of the permanent to the Kekule structure count. A simple method is presented for determining the Kekule structure count of alternant hydrocarbons. For these hydrocarbons, the square of the Kekule structure count is equal to the permanent of the adjacency matrix. In addition, for alternant structures the adjacency matrix for N atoms can be written in such a way that only an N/2 X N/2 matrix need be evaluated. The Kekule structure count correlates with topological indices. The inclusion of the number of cycles improves the fit. When comparing with previous results, the variance decreases 74%. The calculated standard heat of formation correlates with the logarithm of the Kekule structure count. This heat increments 349 kJ/mol each time the Kekule structure count increases by one order of magnitude. (C) 2002 Wiley Periodicals, Inc.

关键词： Kekule structure count permanent of a matrix heat of formation computer algorithm alternant hydrocarbon

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C362. Percentiles: Fixed width estimation

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Journal of Statistical Computation and Simulation 1990年第1期36卷 54-56页

作者： Krutchkoff, Richard G. Virginia Polytechnic Institute State University Blacksburg VA 24061 United States

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关键词： computer algorithm Percentile estimation simulation

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SPECTROSCOPIC DETERMINATION OF CHROMIUM(VI) DURING THE REDUCTION OF CHROMIUM(VI) TO CHROMIUM(III)

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APPLIED SPECTROSCOPY 1991年第6期45卷 1036-1040页

作者： MAXCY, TA WILLHITE, GP GREEN, DW MERTES, KB UNIV KANSAS DEPT CHEM & PETR ENGNLAWRENCEKS 66045 UNIV KANSAS DEPT CHEM & MED CHEMLAWRENCEKS 66045

Reduction of chromium(VI) to chromium(III) by thiourea between pH 3.0 and 5.5 is a key aspect of the chromium(VI)/thiourea/polyacrylamide gel polymer system used in enhanced oil recovery processes. A method has been developed to determine chromium(VI) concentration during the reduction of chromium(VI) to chromium(III) in this pH range. The reduction reaction is run in the presence of an acetic acid/sodium acetate buffer which reacts with the chromium(III) produced and prevents the formation of a brown precipitate which forms in the absence of the buffer. With interference from the precipitate eliminated, chromium(VI) concentration is determined from the visible absorbance of the reaction mixture and the unique molar absorptivity spectra of the five chromium species present in the reaction mixture. An average error of approximately 1% between known and measured chromium(VI) concentrations was demonstrated over a chromium(VI) concentration range from 0.0005 to 0.0025 M.

关键词： REDUCTION OF CHROMIUM(VI) ANALYSIS OF CHROMIUM(VI) computer algorithm

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A generalized inverse algorithm and analysis of experimental designs in a regression framework

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Communications in Statistics 1974年第2期3卷 179-184页

作者： Mullet, Gary M. Walsh, Victor J. College of Industrial Management Georgia Institute of Technology Atlanta Georgia U.S.A United States

This paper describes a generalized inverse algorithm which has been embedded into a regression package to give a versatile experimental design-multiple regression program. It has been tested on a two-way unequal cell frequency design from Dixon and Massey (1969), a balanced randomized incomplete block design from Hicks (1964) and both a three-stage nested sampling design and a two-factor split plot design from Mendenhall (1968). In each case, the only differences in results were within rounding/truncation error limits.

关键词： computer algorithm experimental design generalized inverse regression analysis

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Forced Vibration Analysis of Rectangular Membranes with Clamped Edges 3

Forced Vibration Analysis of Rectangular Membranes with Clam...

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3rd International Conference on Emerging Trends in Engineering, Sciences and Technology (ICEEST)

作者： Amjad, Syed Nabeel Khan, Nadeem Shafi Natl Univ Sci & Technol Coll Aeronaut Engn Aerosp Dept Islamabad Pakistan

ISBN: (纸本)9781538682494

In this work the forced vibration analysis of rectangular membranes with clamped edges has been carried out. The analysis has been carried out for the square as well as rectangular membranes of different aspect ratios. During the study, fundamental frequency and its variation has been analysed with regards to dimensions of the membrane, density and tension in the membrane. A computer algorithm has been written to calculate the natural frequencies for square as well as rectangular membranes with different aspect ratios. Furthermore, the computer code calculates the steady forced vibration response of the membrane for any forcing function. In addition to this, the effect of aspect ratio on the natural frequencies of the membrane has also been analysed. For the steady forced vibration response, six different forces (periodic force, impulse force, step force, pulse force, ramp force and blast force) have been analysed. Deflection plots for square as well as rectangular membranes have been obtained for different instants of time. The algorithm developed during the research will help researchers to carry out the forced vibration response analysis of the square as well as rectangular membranes of any aspect ratio and dimensions.

关键词： Forced Vibration Rectangular Membrane Square Membrane Clamped Edges Natural Frequency Density Tension Displacement Plots Aspect Ratio computer algorithm

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Improvisational Dance Piano Accompaniment System Based on BP Neural Network

Improvisational Dance Piano Accompaniment System Based on BP...

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International Conference on computers and Artificial Intelligence Technologies (CAIT)

作者： Liu, Hongyu Sichuan Univ Media & Commun Chengdu 611745 Sichuan Peoples R China

ISBN: (纸本)9798350396171

In recent years, the rapid development of artificial intelligence and its applications in various fields have led to the rapid development of computer music. Among them, algorithmic composition is an important research field of computer music, which aims to use computer technology to achieve the purpose of automatic composition in the process of composition. Impromptu accompaniment of piano has a very important position in dance art performance. Therefore, this article aims to study the improvisational dance piano accompaniment system based on BP neural network, and analyze the basic principles of BP neural network, the characteristics of BP neural network and dance performance. Based on the role of impromptu accompaniment, an impromptu piano accompaniment system is designed combined with the BP neural network algorithm. Finally, three professional composers were invited to conduct a systematic evaluation of the results of the accompaniment system. The evaluation concluded that the 10 types of results generated by the piano accompaniment system performed well in the accuracy of harmony, coherence, and technical complexity of the accompaniment, and the overall effect also meet the needs of this article.

关键词： BP neural network impromptu dance piano accompaniment accompaniment system computer algorithm

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Simplified firefly algorithm for 2D image key-points search

Simplified firefly algorithm for 2D image key-points search

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IEEE Symposium on Computational Intelligence for Human-Like Intelligence (CIHLI)

作者： Napoli, Christian Pappalardo, Giuseppe Tramontana, Emiliano Marszalek, Zbigniew Polap, Dawid Wozniak, Marcin Univ Catania Dept Math & Informat Viale A Doria 6 I-95125 Catania Italy Silesian Tech Univ Inst Math PL-44100 Gliwice Poland

ISBN: (纸本)9781479945061

In order to identify an object, human eyes firstly search the field of view for points or areas which have particular properties. These properties are used to recognise an image or an object. Then this process could be taken as a model to develop computer algorithms for images identification. This paper proposes the idea of applying the simplified firefly algorithm to search for key-areas in 2D images. For a set of input test images the proposed version of firefly algorithm has been examined. Research results are presented and discussed to show the efficiency of this evolutionary computation method.

关键词： evolutionary computation image recognition object recognition 2D image key-points search computer algorithm evolutionary computation method human eyes image identification simplified firefly algorithm Computational modeling computers Object recognition Search problems Sociology Statistics Vectors Image recognition object recognition tabu search evolutionary algorithm Sociology computational methods Computational modeling computer algorithms computers two dimentional images Lampyridae

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