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Australasian Universities Power Engineering Conference (AUPEC)

作者： Krata, Jaroslaw Univ Queensland Sch Informat Technol & Elect Engn Brisbane Qld Australia

ISBN: (纸本)9781509014057

This paper describes a hybrid real-time simulation method for power system studies and an example application of the proposed technique for distribution grid reactive power controller. The platform consists of a Real-Time Digital Simulator (RTDS), Matlab application and a communication protocol. The RTDS machine is responsible for fast and accurate power system modeling while the Matlab software is used for fast prototyping of a controller. The method was applied to a model that is based on a real distribution grid equipped with a 3.3MWp of photovoltaic generation. A new reactive power control algorithm was designed and tested in a case of a rapid drop of solar insolation. Results prove that the proposed hybrid platform is suitable for power grid control investigations. The real-time tests indicated that the new algorithm can support grid voltage with no negative impact on other grid controllers. The new hybrid method can be applied to other algorithms studies in real-time scenarios.

关键词： Hybrid simulation method RTDS Matlab power grid control reactive power control algorithm testing

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Enabling the integration of clinical event and physiological data for real-time and retrospective analysis

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INFORMATION SYSTEMS AND E-BUSINESS MANAGEMENT 2015年第4期13卷 693-711页

作者： Percival, Jennifer McGregor, Carolyn Percival, Nathan James, Andrew Univ Ontario Inst Technol Fac Business & Informat Technol Oshawa ON Canada Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada Hosp Sick Children Div Neonatol Toronto ON M5G 1X8 Canada Univ Toronto Dept Paediat Toronto ON M5S 1A1 Canada

There is a growing trend of developing advanced clinical decision support systems that analyze physiological data streams for early detection of a variety of clinical diagnoses. This paper presents prototype architecture for both a real-time mobile clinical event data capture application and an Artemis-based replay system for retrospective analysis and validation of physiological data analytics. These two components provide important information for improving the ability of clinical decision support systems and patient monitoring algorithms to detect and adjust for artifacts caused by clinical events. A description of the prototypes, as well as results from initial prototype testing is provided. Although the sample size is small for the initial testing, significant information with respect to design principles and infrastructure needs were uncovered. Future research directions are identified to improve the mobile application through increased security, robustness, further integration into data mining analysis, and future clinical decision support algorithms.

关键词： Real-time patient monitoring systems Intelligent clinical decision support systems Physiological data streams Clinical data integration Data replay algorithm testing

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Volume conductor models in surface electromyography: Applications to signal interpretation and algorithm test

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COMPUTERS IN BIOLOGY AND MEDICINE 2013年第7期43卷 953-961页

作者： Mesin, Luca Politecn Torino Dept Elect & Telecommun I-10129 Turin Italy

Simulation of surface electromyogram (EMG) has provided support for the development and testing of algorithms (e.g., for the extraction of amplitude or spectral properties of the EMG or for the estimation of the muscle fiber conduction velocity) and for the interpretation of experimental results. This is the second part of a pair of papers: the first explains the methods for the development of structure based models of surface EMG;this one provides a summary of interesting applications for the interpretation of signals and testing of algorithms. Simulations from some models already introduced in the literature are compared. Moreover, estimation of indexes from an innovative layered volume conductor including a subcutaneous tissue with variable thickness in space is studied. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Electromyography Volume conductor Interpretation of surface EMG algorithm testing

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Evoptool: an Extensible Toolkit for Evolutionary Optimization algorithms Comparison

Evoptool: an Extensible Toolkit for Evolutionary Optimizatio...

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2010 IEEE World Congress on Computational Intelligence

作者： Valentini, Gabriele Malago, Luigi Matteucci, Matteo Politecn Milan DEI I-20133 Milan Italy

ISBN: (纸本)9781424481262

This paper presents Evolutionary Optimization Tool (Evoptool), an optimization toolkit that implements a set of meta-heuristics based on the Evolutionary Computation paradigm. Evoptool provides a common platform for the development and test of new algorithms, in order to facilitate the performance comparison activity. The toolkit offers a wide set of benchmark problems, from classical toy examples to complex tasks, and a collection of implementations of algorithms from the Genetic algorithms and Estimation of Distribution algorithms paradigms. Evoptool is flexible and easy to extend, also with algorithms based on other approaches that go beyond Evolutionary Computation.

关键词： Evolutionary Optimization Tool Evoptool toolkit algorithm development algorithm testing distribution algorithm evolutionary computation evolutionary optimization algorithm comparison genetic algorithm genetic algorithms optimization toolkit

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Deformation image generation for testing a strain measurement algorithm

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OPTICAL ENGINEERING 2008年第10期47卷 107202-107202页

作者： Koljonen, Janne Alander, Jarmo T. Univ Vaasa Dept Elect Engn & Automat FIN-65101 Vaasa Finland

An optical extensometer was tested using artificially deformed images with a known strain field. A real image series from a tensile test was used to obtain realistic deformation parameters, including spatial and temporal strain characteristics, changes in tonal pixel properties due to deformation, and the effect of nonuniform illumination. These parameters are used to artificially deform a real image taken from an object with a random speckle pattern. The signal-to-noise ratio of the resulting artificially deformed images is varied by applying a blurring pillbox filter and additive Gaussian noise to them. The optical extensometer uses digital image correlation to track homologous points of the object, and further to measure strains. The strain measurement algorithm includes a heuristic to dynamically control the template size in image correlation. Furthermore, several other methods to improve the accuracy-complexity ratio of the algorithm exist. The effects of different parameters and heuristics on the accuracy of the algorithm as well as its robustness against blur and noise are studied. Results show that the proposed test method is practical, and the heuristics improve the accuracy and robustness of the algorithm. c 2008 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.2993319]

关键词： algorithm testing computer vision pattern recognition strain analysis test image generation

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testing imaging systems with genetic algorithms-case: error diffusion methods

Testing imaging systems with genetic algorithms-case: error ...

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Conference on Intelligent Robots and Computer Vision XXV - algorithms, Techniques, and Active Vision

作者： Mantere, Timo Univ Vaasa Dept Elect Engn & Automat FIN-65101 Vaasa Finland

ISBN: (纸本)9780819469243

This paper studies the testing of the imaging systems and algorithms with the genetic algorithms. We test if there are inherent natural weaknesses in the image processing algorithm or system and can they are search and found with the evolutionary algorithms. In this paper, we test the weaknesses of the error diffusion halftoning methods. We also take a closer look at the method and identify why these weaknesses appear and are relatively easy to identify with synthetic test images. Moreover. we discuss the importance of comprehensive testing before the results with some image processing methods can be trustworthy. The results seem to suggest that the error diffusion methods do not have as apparent inherent problems as e.g. dispersed dot method, but the GA testing does reveal some other problems, like delayed response to the image tone changes. The different error diffusion methods have similar problems, but with different intensity.

关键词： genetic algorithms testing weaknesses system testing algorithm testing error diffusion imaging

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testing and optimization of a semiautomatic prostate boundary segmentation algorithm using virtual operators

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MEDICAL PHYSICS 2003年第7期30卷 1637-1647页

作者： Ladak, HM Wang, YQ Downey, DB Fenster, A Univ Western Ontario Dept Med Biophys London ON N6H 5C1 Canada Robarts Res Inst Imaging Res Labs London ON N6H 5C1 Canada London Hlth Sci Ctr Dept Radiol London ON N6H SC1 Canada Univ Western Ontario Dept Elect & Comp Engn London ON N6H 5C1 Canada

Image analysis tasks such as size measurement and landmark-based registration require the user to select control points in an image. The output of such algorithms depends on the choice of control points. Since the choice of points varies from one user to the next, the requirement for user input introduces variability into the output of the algorithm. In order to test and/or optimize such algorithms, it is necessary to assess the multiplicity of outputs generated by the algorithm in response to a large set of inputs;however, the input of data requires substantial time and effort from multiple users. In this paper we describe a method to automate the testing and optimization of algorithms using "virtual operators," which consist of a set of spatial distributions describing how actual users select control points in an image. In order to construct the virtual operator, multiple users must repeatedly select control points in the image on which testing is to be performed. Once virtual operators are generated, control points for initializing the algorithm can be generated from them using a random number generator. Although an initial investment of time is required from the users in order to construct the virtual operator, testing and optimization of the algorithm can be done without further user interaction. We illustrate the construction and use of virtual operators by testing and optimizing our prostate boundary segmentation algorithm. The algorithm requires the user to select four control points on the prostate as input. (C) 2003 American Association of Physicists in Medicine.

关键词： algorithm testing optimization segmentation prostate therapy ultrasound

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testing a measure of image quality for acquisition control

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IMAGE AND VISION COMPUTING 2002年第7期20卷 449-458页

作者： Marchant, JA Silsoe Res Inst Image Anal & Control Grp Bedford MK45 4HS England

Previous work by the author has shown that the entropy of an image's histogram can be used to control the acquisition variables (brightness, contrast, shutter speed) of a camera/digitiser combination in situations where the imaging conditions are changing. Although the control leads to histograms that satisfy pragmatic expectations of what a 'good' histogram should look like (i.e. filling the dynamic range of the digitiser without too much saturation), it avoids the problem of what we mean by a good histogram in the machine vision context and whether the control produces images that have these histograms. In this work a good image is defined to be one where the subsequent analysis algorithms work well. Three different algorithms, each containing many diverse components, are tested on sets of images with different acquisition parameters. As well as acquiring at different parameters, a simulation of the image acquisition process is derived and validated to assist evaluation. Test results show that near-optimal performance is obtained with maximum entropy and it is concluded that this measure is a suitable one for control of image acquisition. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： image quality acquisition control information theory entropy algorithm testing simulation active vision

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Standard test data for estimating peak parameter errors in x-ray photoelectron spectroscopy III. Errors with different curve-fitting approaches

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SURFACE AND INTERFACE ANALYSIS 2000年第12期29卷 856-872页

作者： Conny, JM Powell, CJ Natl Inst Stand & Technol Surface & Microanal Sci Div Gaithersburg MD 20899 USA

We present results in the final part of a three-part study employing standard test data (STD) to estimate errors in peak parameters derived from data analysis procedures used in x-ray photoelectron spectroscopy (XPS), The XPS-STD are simulated doublet and singlet XPS spectra based on spline polynomial models of measured C 1s spectra, The XPS-STD contained 10 sets of spectra, each of which consisted of 18 doublets and 4 singlets, The doublet spectra in each set were treated from a factorial design with three factors: peak separation;relative intensity of the component peaks;and fractional Poisson noise. Each of the XPS-STD sets contained the same complement of doublet and singlet spectra and Poisson noise at the same levels;however, the noise distributions were unique in each spectral set. Seven curve-fitting approaches were used by a group of 20 analysts to represent single peaks: a single Gaussian (G), a Gaussian-Lorentzian (G-L), a Voigt function, a G function with an asymmetry term, a G-L function with an asymmetry term and dual G or G-L functions. We statistically analyzed errors in binding energies and intensities by the type of curve-fitting approach using the Kruskal-Wallis test and the Mann-Whitney U-test, Bias was used to measure the accuracy of a curve-fitting approach, whereas random error was used to measure the precision of the approach. Despite the fact that individual peaks were nearly symmetrical, curve-fitting approaches that accounted for peak asymmetry proved to be the most accurate for determining both peak intensities and binding energies. For the doublets exhibiting the larger peak at the higher binding energy, the use of dual G-L functions to fit individual peaks, as a way to account for peak asymmetry, produced the highest accuracy in determining peak binding energy. This dual peak-shape approach for this particular spectral condition is also preferable for determining peak intensities and produces better precision. The XPS-STD and the statis

关键词： XPS curve fitting reference data bias accuracy random error precision algorithm testing

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algorithm-709 - testing algorithm IMPLEMENTATIONS

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ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE 1992年第4期18卷 375-391页

作者： BUCKLEY, AG ROYAL ROADS MIL COLL DEPT MATHVICTORIA V0S 1B0BCCANADA

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