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检索条件"主题词=Algorithm Development"

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Comparison of induced rules based on likelihood estimation

Comparison of induced rules based on likelihood estimation

引用

Conference on Data Mining and Knowledge Discovery - Theory, Tools, and Technology IV

作者： Tsumoto, S Shimane Med Univ Dept Med Informat Izumo Shimane 6938501 Japan

ISBN: (纸本)0819444804

Rule induction methods have been applied to knowledge discovery in databases and data mining, The empirical results obtained show that they are very powerful and that important knowledge has been extracted from datasets. However, comparison and evaluation of rules are based not on statistical evidence but on rather naive indices, such as conditional probabilities and functions of conditional probabilities. In this paper, we introduce two approaches to induced statistical comparison of induced rules. For the statistical evaluation, likelihood ratio test and Fisher's exact test play an important role: likelihood ratio statistic measures statistical information about an information table and it is used to measure the difference between two tables.

关键词： Statistical analysis Databases Knowledge discovery Data mining Data modeling algorithm development Distance measurement Medicine Binary data Information science

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Resource constrained complexity scalable video decoding via adaptive B-residual computation

Resource constrained complexity scalable video decoding via ...

引用

Conference on Visual Communications and Image Processing 2002

作者： Peng, S Zhong, Z Philips Res Briarcliff Manor NY 10510 USA

ISBN: (纸本)0819444111

As media processing gradually migrates from hardware to software programmable platforms, the number of media processing functions added on the media processor grow even faster than the ever-increasing media processor power can support. Computational complexity scalable algorithms become powerful vehicles for implementing many time-critical yet complexity-constrained applications, such as MPEG2 video decoding. In this paper, we present an adaptive resource-constrained complexity scalable MPEG2 video decoding scheme that makes a good trade-off between decoding complexity and output quality. Based on the available computational resources and the energy level of B-frame residuals, the scalable decoding algorithm selectively decodes B-residual blocks to significantly reduce system complexity. Furthermore, we describe an iterative procedure designed to dynamically adjust the complexity levels in order to achieve the best possible output quality under a given resource constraint. Experimental results show that up to 20% of total computational complexity reduction can be obtained with satisfactory output visual quality.

关键词： Video Computing systems Multimedia Video processing algorithm development Control systems Data processing Distortion Telecommunications Visualization

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Image enhancement for Automatic Target Detection

Image enhancement for Automatic Target Detection

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12th Conference on Automatic Target Recognition

作者： Muise, R Mahalanobis, A Lockheed Martin Orlando FL 32819 USA

ISBN: (纸本)0819444766

Typically when one tackles an Automatic Target Detection (ATD) problem in image data, an assumption is made that the sample of target pixels is statistically different from the sample of background pixels in an immediate neighborhood of the target. algorithms are then devised to recognize groups (or individual) outlier pixels as indicating a possible target to be further processed by an Automatic Target Recognition (ATR) algorithm. In this paper, we present a novel approach for image enhancement that raises the intensity of outlier pixels while suppressing background pixels. Thus, simple thresholding of the enhanced image becomes a powerful ATD algorithm. The approach is not a pixel-level algorithm as it is derived and implemented in the frequency domain. This also implies that, since the algorithm is not specifically intensity-based, low SNR targets can be significantly enhanced if the target frequency domain characteristics are outliers compared to the background frequency domain characteristics. Full performance statistics over a large and clutter rich IR dataset will be presented and compared to other ATD algorithms.

关键词： Detection and tracking algorithms Image enhancement Target detection Automatic target recognition Image processing Signal to noise ratio Silicon Sensors Target recognition algorithm development

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ρ-domain optimum bit allocation and accurate rate control for DCT video coding

ρ-domain optimum bit allocation and accurate rate control f...

引用

Conference on Visual Communications and Image Processing 2002

作者： He, ZH Chen, CW Sarnoff Co Interact Med Grp Princeton NJ 08543 USA

ISBN: (纸本)0819444111

In this research, we have developed a novel and unified rate-distortion (R-D) analysis framework for all standard DCT-based video coding systems, including MPEG-2, H.263, and MPEG-4. Within this framework, we consider the coding bit rate as a function of the percentage of zeros among the quantized DCT coefficients. From our extensive simulations over a wide range of video data, we observe that this rate function appears linear in all standard video coding. Based on Shannon's source coding theorem, we provide a heuristic justification for this linear rate model, which helps us better understand the unique behavior of the video encoder. Within the proposed R-D analysis framework, we have also developed an accurate distortion model. It is expected that this simple yet unified R-D modeling shall have significant impact on various video coding related research and development works, including rate control, bit allocation, joint source and channel coding, and so on. In this work, we have developed a unified bit allocation and rate control algorithm for MPEG-2, H.263 and MPEG-4 video coding. Compared to other rate control algorithms reported in the literature, the proposed algorithm controls the coding bit rate more accurately and robustly. In addition, the coded video quality is significantly improved.

关键词： Video coding Video Distortion Quantization Systems modeling algorithm development Detection and tracking algorithms Computer programming Control systems Image compression

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Simulation of earthquake-induced structural vibrations in systems with SMA damping elements

Simulation of earthquake-induced structural vibrations in sy...

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Smart Structures and Materials 2002 Conference

作者： Seelecke, S Heintze, O Masuda, A N Carolina State Univ Dept Mech & Aerosp Engn Raleigh NC 27695 USA

ISBN: (纸本)0819444456

The paper studies the influence of a shape memory alloy (SMA) element on the dynamic response of a single-degree-of-freedom-system, representing a structural building under earthquake excitation. Variations of the SMA geometry are studied by numerical simulation, and a value for the SMA radius is determined, which provides optimal system performance. In particular do we focus on the role of hysteresis-induced passive damping, which can potentially be exploited for the development of SMA-based semi-active control schemes.

关键词： Shape memory alloys Earthquakes Chemical elements Control systems Motion models Numerical simulations Smart materials Aerospace engineering algorithm development Systems engineering

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Quantum computing and a unified approach to fast unitary transforms

Quantum computing and a unified approach to fast unitary tra...

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Conference on Image Processing - algorithms and Systems

作者： Agaian, SS Klappenecker, A CUNY New York NY 10021 USA

ISBN: (纸本)0819444073

A quantum computer directly manipulates information stored in the state of quantum mechanical systems. The available operations have many attractive features but also underly severe restrictions, which complicate the design of quantum algorithms. We present a divide-and-conquer approach to the design of various quantum algorithms. The class of algorithm includes many transforms which are well-known in classical signal processing applications. We show how fast quantum algorithms can be derived for the discrete Fourier transform, the Walsh-Hadamard transform, the Slant transform, and the Hartley transform. All these algorithms use at most O(log(2) N) operations to transform a state vector of a quantum computer of length N.

关键词： Transform theory Quantum communications Quantum computing Fourier transforms Signal processing Quantum information Matrices algorithm development Computing systems Quantum mechanics

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Structural integrity monitoring of composite patch repairs using wavelet analysis and neural networks

Structural integrity monitoring of composite patch repairs u...

引用

Smart Structures and Materials 2002 Conference

作者： Amaravadi, VK Mitchell, K Rao, V Derriso, MM Univ Missouri Ctr Integrated Syst Rolla MO USA

ISBN: (纸本)0819444499

Bonded composite repairs for the reinforcement of damaged aircraft structures are effective in extending the life of aging airframes. The structural integrity of the composite patch repair in terms of disbond, fracture at the bond-lines, delamination, and structural crack growth is to be investigated before the composite repair technology can be adopted by the aerospace industry. We have developed structural health monitoring techniques for locating, identifying, and quantifying damages using the changes in the dynamical response of the repaired structure. A signal-based health monitoring algorithms wavelet transforms, have been developed for monitoring the structural integrity of composite patches, which detects variations induced by small changes in the vibration signature of the repaired structure. In this paper, threshold wavelet maps and neural networks have been integrated to detect and quantify the damage (s) in the composite patch repairs. Neural networks are utilized to find the extent of the damage. This method is also capable of detecting multiple damages. The mode shapes are obtained analytically using finite element analysis and experimentally with laser vibrometer. We have also developed a wireless data acquisition system for collection, feature extraction, and transmission of vibration data. The results of the damage location and extent estimation in the composite patch repairs are satisfactory.

关键词： Wavelets Composites Neural networks Aluminum Adhesives Finite element methods algorithm development Damage detection Data acquisition Network architectures

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MPEG-4/XML file compression and its application to error resilient coding

MPEG-4/XML file compression and its application to error res...

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Conference on Multimedia Systems and Applications V

作者： Sun, XM Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819446408

Many error resilience techniques have been proposed to improve the MPEG-4 coding performance. However, most of them can hardly detect and correct errors occurring in headers, motion vectors and macroblock mode data. MPEG-4/XML was introduced in our previous work to protect the important information of video against error corruption. However, the overhead of a straightforward XML description can be high. In this work, we develop an efficient XML compression algorithm to reduce the MPEG-4/XML file size. Furthermore, we present a XML-based MPEG-4 error resilience technique performed at the macroblock level. Experimental results are given to demonstrate the performance of the proposed MPEG-4/XML coding technique.

关键词： Video Video coding Video compression Error analysis Binary data Computer programming algorithm development Video processing Detection and tracking algorithms System integration

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Power control algorithms in wireless communications

Power control algorithms in wireless communications

引用

Conference on Digital Wireless Communications IV

作者： Rohwer, JA Abdallah, CT El-Osery, A Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819444901

This paper presents a comprehensive review of the published algorithms on power control for cellular systems. The majority of the research is focused on Code Division Multiple Access (CDMA) systems, although a small fraction of the reviewed literature pertains to Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA).

关键词： Control systems algorithm development Stochastic processes Transmitters Error analysis Receivers Wireless communications Detection and tracking algorithms Principal component analysis Telecommunications

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Multiplicative theorem based fast Williamson-Hadamard transforms

Multiplicative theorem based fast Williamson-Hadamard transf...

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Conference on Image Processing - algorithms and Systems

作者： Agaian, S Sarukhanyan, H Astola, J Univ Texas San Antonio San Antonio TX 78285 USA

ISBN: (纸本)0819444073

Hadamard matrices have received much attention in recent years, owing to their numerous known and promising applications. The difficulties of construction of N equivalent to 0(mod4)-point Hadamard transforms are related to the existence of Hadamard matrices problem. In this paper algorithms for fast computation of N-point Williamson-Hadamard transform based on multiplicative theorems are presented. Comparative estimates revealing the efficiency of the proposed algorithms with respect to the known ones are given. The results of numerical examples are presented.

关键词： Matrices Transform theory algorithm development algorithms Telecommunications Data compression Detection and tracking algorithms Information science Reconstruction algorithms Signal processing

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