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Time slot allocation scheme based on a region division in CDMA/TDD systems

Time slot allocation scheme based on a region division in CD...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Sung-Hong Wie Dong-Ho Cho Communication and Information System Laboratory Department of Electrical Engineering & Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea

In wireless multimedia networks, there exists traffic asymmetry between uplink and downlink channels. The CDMA/TDD system can alleviate this problem, however, previous work in this area can not manage efficiently the traffic, asymmetry among cells. In this paper, we propose a new time slot allocation scheme that considers the traffic pattern of each cell. To solve the inter-cell interference problem, we divide a cell's area into two regions and we allocate the resource of crossed slots to mobile stations which are existing in the inner-region. This proposed scheme increases the resource utilization and decreases the blocking probability of the system as a whole. And our DARD (Different time slot Allocation based on a Region Division) scheme outperforms conventional SA (Same time slot Allocation) scheme in the heterogeneous traffic environment.

关键词： Multiaccess communication Resource management Downlink Interference Multimedia systems Intelligent networks Information systems Laboratories computer science Web and internet services

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Use of computational intelligence for corrosion damage assessment of aging aircraft panels

Use of computational intelligence for corrosion damage asses...

引用

2001 ASME International Mechanical engineering Congress and Exposition

作者： Palakal, M.J. Pidaparti, R.M. Rebbapragada, S. Huang, J. Peeler, D.T. Department of Computer Science Indiana University Purdue University Indianapolis IN 46202 United States Department of Mechanical Engineering Indiana University Purdue University Indianapolis IN 46202 United States Air Force Research Laboratory System Support Division MLSA Dayton OH 45385 United States

This paper describes computational methods that have been developed to automatically detect and quantify corrosion on images of aircraft panels obtained using nondestructive inspection (NDI) techniques. Images obtained from NDI techniques are not directly suitable for corrosion analysis. We propose a multi-resolution wavelet analysis to segment the NDI images to isolate the corroded regions from the undamaged regions. Wavelet coefficients were extracted from each segment and subjected to a multivariate data analysis to obtain the most relevant features. These features are then used to identify the corroded region on the images and also to estimate the extent of damage, in terms of material loss, using backpropagation neural networks. Experiments were conducted to test the developed modules on images obtained from the Air Force Research Lab in Dayton, Ohio. The results obtained prove the feasibility and robustness of our approach in detecting the damaged regions and for estimating the material loss due to corrosion.

关键词： Aircraft parts and equipment

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A modified constant modulus algorithm for adaptive channel equalization for QAM signals

A modified constant modulus algorithm for adaptive channel e...

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IEEE/SP Workshop on Statistical Signal Processing (SSP)

作者： M. Amin Lin He C.R. Reed R. Malkemes Department of Electrical and Computer Engineering Villanova University Villanova PA USA Integrated Circuit System Laboratory Sarnoff Corporation Princeton NJ USA

A modified constant modulus algorithm (MCMA) for adaptive equalization of the wireless indoor channel for QAM signals is presented. The algorithm minimizes an error cost function that includes both the amplitude and phase of the equalizer output. In addition to the amplitude-dependent term that is provided by the conventional constant modulus algorithm (CMA), the cost function includes a signal constellation matched error (CME) term. This term speeds up convergence and allows the equalizer to switch to decision directed (DD), or any soft-decision mode, faster than the CMA applied alone. The constellation-matched error term is constructed using polynomials with desirable properties. The MCMA is applied to a decision feedback equalizer and shown to provide improved performance over dual mode techniques.

关键词： Adaptive equalizers Quadrature amplitude modulation Cost function Convergence Polynomials Constellation diagram Switches Laboratories computer errors Decision feedback equalizers

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Evolving groups of basic decision trees

Evolving groups of basic decision trees

引用

Annual IEEE Symposium on computer-Based Medical systems

作者： M. Sprogar P. Kokol M. Zorman V. Podgorelec L. Lhotska J. Klema Faculty of Electrical Engineering and Computer Science Laboratory for System Design Maribor Slovenia Gerstner Laboratory Faculty of Electrical Enginéering Czech Technical University Prague Czech Republic

A decision tree is a good classifier with a transparent decision mechanism. Decision-tree building methods usually have problems in splitting the learning samples into more subsets, because of the nature of the tree. If the classification into such subsets is not possible, it is better to put the classification decision on to some other classifier. This leads to the introduction of a null classification, which simply means that no classification is possible in this step. This approach is sensible with evolutionary methods, as they can handle a number of trees simultaneously. In the process of construction, we have to address the problem of whether a classification is sensible. The performance of the proposed model has been tested on several data sets and the results presented on one such data set show its potential.

关键词： Decision trees Testing Classification tree analysis Medical diagnostic imaging Decision making Laboratories computer science Humans Intelligent systems Genetic algorithms

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Mining user access behavior on the WWW

Mining user access behavior on the WWW

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IEEE International Conference on systems, Man and Cybernetics

作者： Mei-Ling Shyu Shu-Ching Chen Choochart Haruechaiyasak Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia System Laboratory School of Computer Science Florida International University Miami FL USA

In this paper, an affinity-based approach that provides good similarity measures for Web document clustering to discover user access behavior on the World Wide Web (WWW) is proposed. The proposed approach generates the similarity measures for groups of Web documents by considering the user access patterns. Any clustering algorithm using better similarity measures should yield better clusters for discovering user access behavior. By utilizing the discovered user access behavior, for example, the companies can precisely target their potential customers and convince them to purchase their products or services in electronic commerce. An experiment on a real data set is conducted and the experimental result shows that the proposed approach yields a better performance than the cosine coefficient and the Euclidean distance method under the partitioning around medoid (PAM) method.

关键词： World Wide Web Uniform resource locators Electronic commerce Web sites Clustering algorithms Multimedia systems Laboratories computer science Electric variables measurement Euclidean distance

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An unsupervised segmentation framework for texture image queries

An unsupervised segmentation framework for texture image que...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Shu-Ching Chen Mei-Ling Shyu Chengcui Zhang Distributed Multimedia Information System Laboratory School of Computer Science Florida International University FL USA Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA

In this paper a novel unsupervised segmentation framework for texture image queries is presented. The proposed framework consists of an unsupervised segmentation method for texture images, and a multi-filter query strategy. By applying the unsupervised segmentation method on each texture image, a set of texture feature parameters for that texture image can be extracted automatically. Based upon these parameters, an effective multi-filter query strategy which allows the users to issue texture-based image queries is developed The test results of the proposed framework on 318 texture images obtained from the MIT VisTex and Brodatz database are presented to show its effectiveness.

关键词： Image segmentation Image databases Image retrieval Multimedia systems Information systems Laboratories computer science Spatial databases Image texture analysis Information retrieval

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A comparative performance analysis of a DDR-SDRAM, a D-RDRAM, and a DDR-FCRAM using a POPeye simulator

A comparative performance analysis of a DDR-SDRAM, a D-RDRAM...

引用

2001 IEEE International Symposium on Circuits and systems, ISCAS 2001

作者： Lee, Kangmin Yoon, Chi Weon Woo, Ramchan Kook, Jeong-Hun Koo, Ja-Il Jung, Tae-Sung Yoo, Ho-Jun Semiconductor System Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Yusong-gu Taejon 305-701 Korea Republic of Samsung Electronics San #24 Nongseo-ri. Kiheung-eup Yongin Kyungki-do 449-900 Korea Republic of

ISBN: (纸本)0780366859

We implemented POPeye (Probe of Performance+eye), a system analysis simulator to evaluate DRAM performance in a personal computer environment. When running any real-life application programs such as Microsoft Office and Paint Shop Pro on Windows OS, POPeye simulates detailed transactions between a CPU and a memory system. Using this tool, we comparatively analyzed the performance of a DDR-SDRAM, a D-RDRAM, and a DDR-FCRAM. © 2001 IEEE.

关键词： Dynamic random access storage

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A technique for characterization and visualization of PMD

A technique for characterization and visualization of PMD

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Conference on Lasers and Electro-Optics (CLEO)

作者： P.M. Sylla C.J.K. Richardson M. Van Leuwen M. Saylors J. Goldhar Laboratory for Physical Sciences & Department of Electrical and Computer Engineering University of Maryland College Park MD USA Department of Electrical and Computer Engineering University of Maryland College Park MD University System of Maryland Adelphi MD US

Summary form only given. Polarization mode dispersion (PMD) is a limiting factor for higher bit rate in optical transmission lines. Due to the complexity of calculating the complete set of PMD parameters a simple representation is needed before real time PMD compensation can be realized. We used several broadband sources such as a multimode Fabry-Perot laser, ASE from an EDFA and 10 Gb/s NRZ data carried on a modulated CW source. A scanning polarization controller varies the input state of polarization of the source uniformly on the Poincare sphere at the input of the fiber transmission line under test. At the output, we use a HP8509B polarization analyzer to record the output state of polarization and the degree of polarization (DOP) as a function of time.

关键词： Visualization Transmission lines Polarization mode dispersion Bit rate Fabry-Perot Fiber lasers Laser modes Erbium-doped fiber amplifier Optical signal processing Optical fiber polarization

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Optimal resource utilization in multimedia transmission

Optimal resource utilization in multimedia transmission

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Mei-Ling Shyu Shu-Ching Chen Hongli Luo Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA

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An intelligent framework for spatio-temporal vehicle tracking

An intelligent framework for spatio-temporal vehicle trackin...

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International Conference on Intelligent Transportation

作者： Shu-Ching Chen Mei-Ling Shyu Chengcui Zhang Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA

Recently, the Intelligent Transportation systems (ITS) have been identified as the new paradigm to address the growing mobility problems, and to alleviate congestion and augment the quality of vehicular flow. This paper presents an intelligent and automatic framework for spatio-temporal vehicle tracking in video sequences in order to provide useful information to the traffic control center. The spatio-temporal relationships of the objects are captured automatically via a proposed unsupervised image/video segmentation method and multimedia input strings. A traffic video sequence is used to demonstrate the effectiveness of the proposed framework to identify and track the vehicle objects in the video sequence.

关键词： Intelligent vehicles Traffic control Video sequences Intelligent transportation systems Communication system traffic control Information systems Vehicle detection Intelligent control Multimedia systems Laboratories

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