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检索条件"机构=Sch. of Elec. Engineering and Computer Science"

共 863 条记录，以下是131-140 订阅

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Distorted speech rejection for automatic speech recognition in wireless communication

Distorted speech rejection for automatic speech recognition ...

引用

作者： Chang, Joon-Hyuk Kim, Nam Soo Inst. of New Media/Communication Sch. of Elec. Eng./Computer Science Seoul National University Seoul Korea Republic of

This letter introduces a pre-rejection technique for wireless channel distorted speech with application to automatic speech recognition (ASR). Based on analysis of distorted speech signals over a wireless communication channel, we propose a method to reject the channel distorted speech with a small computational load. From a number of simulation results, we can discover that the pre-rejection algorithm enhances the robustness of speech recognition operation.

关键词： Wireless telec.mmunication systems

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An OFDM transmission sch.me using variable-length groupwise orthogonal code multiplexing

An OFDM transmission scheme using variable-length groupwise ...

引用

2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall

作者： Oh, Seong Keun Kwon, Ki Bum Sunwoo, Myung Hoon Sch. of Elec./Computer Engineering Ajou University San 5 Wonchon-Dong Paldal-Gu Suwon 442-749 Korea Republic of

ISBN: (纸本)0780379543

We propose a novel orthogonal frequency division multiplexing (OFDM) transmission sch.me using variable-length groupwise (VLG) orthogonal code multiplexing (OCM). It reduces significantly the complexity for multiplexing and demultiplexing with just a little sacrifice in the performance as compared with the ordinary OCM sch.me. In the proposed sch.me, all the subcarriers are divided into multiple subcarrier groups, in which each group is composed of only relatively less correlated subcarriers. The sch.me then transmits modulation symbols through two-step interleaving and groupwise OCM. As a proper set of VLG orthogonal codes, we use the set of discrete Fourier transform (DFT) codes. We consider the coded and uncoded VLG-OCM OFDM systems. Finally, we evaluate the bit error rate (BER) performance and the complexity according to the OCM code length.

关键词： Orthogonal frequency division multiplexing

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Spatio-temporal correlation: Theory and applications for wireless sensor networks

Spatio-temporal correlation: Theory and applications for wir...

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作者： Vuran, Mehmet C. Akan, Özgür B. Akyildiz, Ian F. Broadband/Wireless Networking Lab. Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States

Wireless Sensor Networks (WSN) are characterized by the dense deployment of sensor nodes that continuously observe physical phenomenon. Due to high density in the network topology, sensor observations are highly correlated in the space domain. Furthermore, the nature of the physical phenomenon constitutes the temporal correlation between each consecutive observation of a sensor node. These spatial and temporal correlations along with the collaborative nature of the WSN bring significant potential advantages for the development of efficient communication protocols well-suited for the WSN paradigm. In this paper, several key elements are investigated to capture and exploit the correlation in the WSN for the realization of advanced efficient communication protocols. A theoretical framework is developed to model the spatial and temporal correlations in WSN. The objective of this framework is to enable the development of efficient communication protocols which exploit these advantageous intrinsic features of the WSN paradigm. Based on this framework, possible approaches are discussed to exploit spatial and temporal correlation for efficient medium access and reliable event transport in WSN, respectively. © 2004 Elsevier B.V. All rights reserved.

关键词： computer networks

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Applying collaborative filtering for efficient document search

Applying collaborative filtering for efficient document sear...

引用

Proceedings - IEEE/WIC/ACM International Conference on Web Intelligence, WI 2004

作者： Jung, Seikyung Kim, Juntae Herlocker, Jonathan L. Sch. of Elec. Eng. and Comp. Science Oregon State University Corvallis OR United States Department of Computer Engineering Donguk University Seoul Korea Republic of

ISBN: (纸本)0769521002

This paper presents the SERF (System for elec.ronic Recommendation Filtering) which is a collaborative filtering system that recommends context-sensitive, high-quality information sources for document search. Collaborative filtering systems remove the limitation of traditional content-based search by using individual's ratings to evaluate and recommend information sources. SERF uses collaborative filtering algorithms to predict the relevance and quality of each document with respect to each particular user and their specific information need. In our system, users specify their need in the form of a natural language query, and are provided with recommended documents based on ratings by other users with similar questions. Preliminary experiments show that the collaborative filtering recommendations increase the efficiency of the document search process. We also discuss some key challenges of designing a collaborative filtering system for document search. © 2004 IEEE.

关键词： Information retrieval systems

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Reference wave generation in dynamic voltage restorers by use of PQR power theory

Reference wave generation in dynamic voltage restorers by us...

引用

19th Annual IEEE Applied Power elec.ronics Conference and Exposition - APEC 2004

作者： Kim, Hyosung Lee, Sang-Joon Sul, Seung-Ki Dept. of Control Engineering Cheonan National Technical College Korea Republic of Sch. of Elec. Eng./Computer Science Seoul National University Korea Republic of

Dynamic voltage restorer (DVR)s are known as effective and economic means to compensate for voltage sags and swells [1]-[11], This paper proposes a novel method to generate reference waves synchronized with the grid whether or not the line voltages are distorted by a fault. The proposed reference wave generator (RWG) looks for the normal voltage waveforms in the grid from the corrupted line voltages and synthesizes the expected positive sequence reference waves for DVRs. There is no transient problem on the generated reference waves when the line voltages are distorted by faults. Experimental results verified the proposed theory very well.

关键词： elec.rical engineering

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An evolutionary algorithm method for sampling n-partite graphs

An evolutionary algorithm method for sampling n-partite grap...

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Proceedings of the 2004 Congress on Evolutionary Computation, CEC2004

作者： Goldstein, Michel L. Yen, Gary G. Intelligent Syst./Contr. Laboratory Sch. of Elec./Computer Engineering Oklahoma State University Stillwater OK 74078 United States

ISBN: (纸本)0780385152

The growth of use of graph-structured databases modeled on n-partite graphs has increased the ability to generate more flexible databases. However, the calculation of certain features in these databases may be highly resource-consuming. This paper proposes a method for approximating these features by sampling. A discussion of the difficulty of sampling in n-partite graphs is made and an evolutionary algorithm-based method is presented that uses the information from a smaller subset of the graph to infer the amount of sampling needed for the rest of the graph. Experimental results are shown on a publications database on Anthrax for finding the most important authors.

关键词： computer science

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A simplified maximum likelihood detection sch.me for MIMO systems

A simplified maximum likelihood detection scheme for MIMO sy...

引用

2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall

作者： Sung, Hozun Lee, Kwang Bok Kang, Jee Woong Sch. of Elec. Eng./Computer Science Seoul National University Shinlim-dong Kwanak-gu Seoul 151-742 Korea Republic of

Multiple transmit and multiple receive antennas system, referred to Multiple-Input Multiple-Output (MIMO) system, is known to achieve large channel capacity without bandwidth expansion. In this paper, we propose a simplified ML detection sch.me for MIMO system which has reduced computational complexity compared to Maximum Likelihood (ML) detection sch.me. According to simulation results, the bit error rate (BER) performance of the proposed sch.me shows similar with that of ML detection sch.me with significant reduction in the computational complexity.

关键词： Wireless telec.mmunication systems

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Optical properties and their depth profiling of Si nanocrystals embedded in SiO2 matrix

Optical properties and their depth profiling of Si nanocryst...

引用

BioMEMS and Nanotechnology

作者： Chen, Tu Pei Liu, Yang Tse, Man Siu Gui, Dong Sch. of Elec./Electronic Engineering Nanyang Technological University Singapore 639798 Institute of Microelectronics Singapore Science Park II Singapore 117685

In this work, we have developed an approach to determination of optical constants of Si nanocrystals embedded in SiO2 matrix synthesized with Si ion implantation. The approach is based on the effective medium approximation, and appropriate models are developed to simulate the secondary ion mass spectroscopy and spectroscopic ellipsometry measurements on the material system. The energy gap expansion of the Si nanocrystals due to the nanocrystal size effect has been obtained by modeling the optical properties with the single-oscillator model. From the energy gap expansion the nanocrystal size can be also obtained with the phenomenological model based on quantum confinement and the bond contraction model, In addition, a novel approach to quantitative determination of depth profiles of optical constants of Si nanocrystals embedded in SiO2 thin films, which is useful to the applications of light emitting and waveguiding of the nanocrystals, is also developed in this work.

关键词： Nanostructured materials

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CRCD experiences at the university of Central Florida: An NSF project

CRCD experiences at the university of Central Florida: An NS...

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ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Georgiopoulos, Michael Castro, Jose Gelenbe, Erol Demara, Ronald Gonzalez, Avelino Kysilka, Marcella Mollaghasemi, Mansooreh Wu, Annie Russell, Ingrid University of Central Florida University of Central Florida Imperial College University of Hartford Sch. of Elec. Eng. and Comp. Science University of Central Florida Department of Computer Science University of Hartford Computer Engineering Program University of Central Florida Education Foundations Department University of Central Florida Sch. of Elec. Eng. and Comp. Science Coll. of Eng. and Computer Science University of Central Florida Industrial Engineering Department University of Central Florida

Machine Learning has traditionally been a topic of research and instruction in computer science and computer engineering programs. Yet, due to its wide applicability in a variety of fields, its research use has expanded in other disciplines, such as elec.rical engineering, industrial engineering, civil engineering, and mechanical engineering. Currently, many undergraduate and first-year graduate students in the aforementioned fields do not have exposure to recent research trends in Machine Learning. This paper reports on a project in progress, funded by the National science Foundation under the program Combined Research and Curriculum Development (CRCD), whose goal is to remedy this shortcoming. The project involves the development of a model for the integration of Machine Learning into the undergraduate curriculum of those engineering and science disciplines mentioned above. The goal is increased exposure to Machine Learning technology for a wider range of students in science and engineering than is currently available. Our approach of integrating Machine Learning research into the curriculum involves two components. The first component is the incorporation of Machine Learning modules into the first two years of the curriculum with the goal of sparking student interest in the field. The second is the development of new upper level Machine Learning courses for advanced undergraduate students. The paper will focus on the details of the integration of a machine learning module (related to neural networks) applied to a Numerical Analysis class, taught to sophomores and juniors in the engineering Departments at the University of Central Florida. Furthermore, it will report results on the assessment and evaluation of the effectiveness of the module by the students taking the class. Finally, based on the assessment results some conclusions will be drawn regarding the potential of the modules in attracting undergraduate students into research, specifically machine-learning

关键词： Learning systems

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Software prefetching for mark-sweep garbage collection: Hardware analysis and software redesign

Software prefetching for mark-sweep garbage collection: Hard...

引用

11th International Conference on Architectural Support for Programming Languages and Operating Systems, ASPLOS XI

作者： Cher, Chen-Yong Hosking, Antony L. Vijaykumar, T.N. Sch. of Elec. and Comp. Engineering Purdue University West Lafayette IN 47907 Department of Computer Sciences Purdue University West Lafayette IN 47907

ISBN: (纸本)1581138040

Tracing garbage collectors traverse references from live program variables, transitively tracing out the closure of live objects. Memory accesses incurred during tracing are essentially random: a given object may contain references to any other object. Since application heaps are typically much larger than hardware caches, tracing results in many cache misses. Technology trends will make cache misses more important, so tracing is a prime target for prefetching. Simulation of Java benchmarks running with the Boehm-Demers-Weiser mark-sweep garbage collector for a projected hardware platform reveal high tracing overhead (up to 65% of elapsed time), and that cache misses are a problem. Applying Boehm's default prefetching strategy yields improvements in execution time (16% on average with incremental/generational collection for GC-intensive benchmarks), but analysis shows that his strategy suffers from significant timing problems: prefetches that occur too early or too late relative to their matching loads. This analysis drives development of a new prefetching strategy that yields up to three times the performance improvement of Boehm's strategy for GC-intensive benchmarks (27% average speedup), and achieves performance close to that of perfect timing (ie, few misses for tracing accesses) on some benchmarks. Validating these simulation results with live runs on current hardware produces average speedup of 6% for the new strategy on GC-intensive benchmarks with a GC configuration that tightly controls heap growth. In contrast, Boehm's default prefetching strategy is ineffective on this platform.

关键词： computer software

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