检索结果-内蒙古大学图书馆

Biomedical Topical Meeting, BIOMED 2004

作者： Tan, Wei Fahrner, Lester J. Sendemir-Urkmez, Aylin Jamison, Russell D. Leckband, Deborah E. Boppart, Stephen A. Beckman Institute for Advanced Science and Technology University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Materials Science and Engineering University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Chemical Engineering University of Illinois at Champaign-Urbana UrbanaIL61801 United States Department of Electrical and Computer Engineering Bioengineering Program Beckman Institute for Advanced Science and Technology College of Medicine University of Illinois at Urbana-Champaign 405 North Mathews Avenue UrbanaIL61801 United States

Optical coherence tomography (OCT), confocal, and multiphoton microscopy are used to nondestructively monitor in situ cell distribution and cell-matrix interaction in 3-D engineered tissues composed of chitosan scaffo... 详细信息

ISBN: (纸本)1557527695

关键词： Tissue

来源：评论

学校读者我要写书评

暂无评论

Joint semiblind channel estimation and data detection for MIMO-OFDM systems

Joint semiblind channel estimation and data detection for MI...

引用

Proceedings of the IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Jiang Yue Kyeong Jin Kim T. Reid J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Nokia Research Center TX Nokia Research Center Irving TX USA Media Arts and Technology Program and Electrical & Computer Engineering University of California Santa Barbara Santa Barbara CA

In MIMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse responses are often assumed to be constant over a block or packet. This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on N/sub P/ subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost. The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over noniteration.

关键词： Channel estimation MIMO Receiving antennas Transmitting antennas Transmitters Degradation OFDM Iterative algorithms Computational efficiency Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Optical coherence tomography of breast cancer: Feasibility for surgical guidance

Optical coherence tomography of breast cancer: Feasibility f...

引用

Biomedical Topical Meeting, BIOMED 2004

作者： Bredfeldt, Jeremy S. Luo, Wei Marks, Daniel L. Singletary, Keith W. Wisseman, Charles L. Johnson, Patricia A. Boppart, Stephen A. Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign United States Department of Food Science and Human Nutrition Functional Foods for Health Program University of Illinois at Urbana-Champaign United States Surgical Pathology and Oncology Carle Foundation Hospital UrbanaIL United States Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Bioengineering Program College of Medicine University of Illinois at Urbana-Champaign 405 N. Mathews Avenue UrbanaIL61801 United States

We present the use of OCT for breast cancer imaging. In situ rat mammary and excised human breast tumors were imaged. The feasibility of OCT for applications in surgical oncology of the breast is discussed. © 200... 详细信息

ISBN: (纸本)1557527695

关键词： Optical tomography

来源：评论

学校读者我要写书评

暂无评论

Space-time signaling based on Kerdock and Delsafte-Goethals codes

Space-time signaling based on Kerdock and Delsafte-Goethals ...

引用

IEEE International Conference on Communications (ICC)

作者： A.R. Calderbank S.N. Diggavi N. Al-Dhahir Program in Applied and Computational Mathematics Princeton University Princeton NJ USA School of Computer and Communication Sciences Swiss Federal Institute of Technology Lausanne Switzerland Department of Electrical Engineering University of Technology Dallas TX USA

This paper designs space-time codes for standard PSK and QAM signal constellations that have flexible rate, diversity and require no constellation expansion. Central to this construction are binary partitions of the PSK and QAM constellations that appear in codes designed for the Gaussian channel. The space-time codes presented here are designed by separately specifying the different levels of the binary partition in the space-time array. The individual levels are addressed by either the binary symmetric matrices associated with codewords in a Kerdock code or other families of binary matrices. Binary properties of these sets are sufficient to verify the diversity property of the codewords in the complex domain. Larger sets of binary symmetric matrices (such as the set used in Delsarte-Goethals codes) are used to trade diversity protection for increased rate.

关键词： Space time codes Phase shift keying Quadrature amplitude modulation Constellation diagram Symmetric matrices Binary phase shift keying Quadrature phase shift keying Transmitting antennas Fading Mathematics

来源：评论

学校读者我要写书评

暂无评论

The effects of process parameters on size, density, structure, and field emission properties of Pd-catalyzed carbon nanotubes synthesized by thermal chemical vapor deposition

The effects of process parameters on size, density, structur...

引用

International Conference on Vacuum Nanoelectronics (IVNC)

作者： S. Wei W.P. Kang W.H. Hofmeister J.L. Davidson Y.M. Wong J.H. Huang Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Department of Chemical Engineering Vanderbilt University Nashville TN USA Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

In this study, various thicknesses of Pd catalytic films were deposited on Ti/Si substrates and pretreated with NH/sub 3/. The effects of catalyst deposition parameters and NH/sub 3/ pretreatment time (0, 1, and 10 minutes) on the size distribution of Pd catalytic particles, and subsequently, on the diameter and density of synthesized carbon nanotubes (CNTs) were investigated. The CNTs were synthesized by thermal CVD at 750/spl deg/C using methane (CH/sub 4/) as the carbon source, and a mixture of Ar/H/sub 2/ (80 vol.%/20 vol.%) as the carrier gas.

关键词： Carbon nanotubes Chemical vapor deposition Argon Hydrogen Scanning electron microscopy Morphology Substrates Materials science and technology Transmission electron microscopy Carbon dioxide

来源：评论

学校读者我要写书评

暂无评论

Picosecond response of metal-semiconductor-metal ultraviolet photodiodes

Picosecond response of metal-semiconductor-metal ultraviolet...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Jianliang Li W.R. Donaldson T.Y. Hsiang Material Science Program a d olboratory for Laser Energetics University of Rochester Rochester NY USA Laboratory for Laser Energetics University of Rochester Rochester NY USA Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

We studied the ultrafast response in metal-semiconductor-metal ultraviolet photodiodes fabricated on GaN. The best performance of a device with 1-/spl mu/m finger width and spacing showed a 3.5-ps response. The pulse ... 详细信息

ISBN: (纸本)1557527776

关键词： Photodiodes Optical pulse shaping Fingers Energy measurement Gallium nitride Optical devices Ultrafast optics Time measurement Laser theory Rivers

来源：评论

学校读者我要写书评

暂无评论

Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

引用

Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and computers

作者： Wei, Bo Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and Adaptive Multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Telecommunication links

来源：评论

学校读者我要写书评

暂无评论

Virtual PQ troubleshooter

引用

IEEE Power and Energy Magazine 2003年第3期1卷 24-31页

作者： Li, Chun Xu, Wilsun Hughes, Brent Gurney, James Neilson, Bruce Electrical and Computer Engineering Department University of Alberta Canada University of Alberta Canada Revenue Metering and Distribution Standards BC Hydro Canada IEEE Cigré Study Committee 36 BC Hydro's Strategic Research and Development Program IEEE Canada

An overview is given of the development of a PQ instrument that is specifically geared to power quality troubleshooting applications. The development has benefited from recent advancement in PC-based instrumentation technology and PQ disturbance source detection methods. The resultant instrument is a virtual tool, a laptop equipped with a PCMCIA card that performs all the instrumentation functions. This strategy has enhanced the reliability and flexibility of the device and also reduced the development efforts.

关键词： Electric power systems

来源：评论

学校读者我要写书评

暂无评论

RJSSim: A reconfigurable job scheduling simulator for parallel processing learning 33

RJSSim: A reconfigurable job scheduling simulator for parall...

引用

33rd Annual Frontiers in Education, FIE 2003

作者： Góes, Luís F.W. Martins, Carlos A.P.S. Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil Pontifical Catholic University of Minas Gerais Computer Science Department Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil

ISBN: (纸本)0780379616

In this work, we present and analyze the use of a reconfigurable job scheduling simulator called RJSSim as an aid tool for parallel processing learning. This software is a functional and performance Java-based simulator of job scheduling policies. Our objectives are: to present RJSSim;to show the use of RJSSim and reconfigurability concepts for parallel processing learning. First, we present a prototype of RJSSim and the reconfigurability concept. Then we describe two case studies remarking the main parallel processing concepts and skills students can learn. In the first case study, we analyze two parallel algorithm models. In the second, we do some performance tests among parallel (reconfigurable) scheduling policies and architectures. Then, we analyze the performance through some metrics like response time, idle time etc. Finally we discuss and analyze the use of RJSSim for parallel processing learning. Our main contribution is: an implementation of RJSSim for parallel processing learning. © 2003 IEEE.

关键词： Parallel algorithms

来源：评论

学校读者我要写书评

暂无评论

Controller Design via Adaptive Critic and Model Reference Methods

Controller Design via Adaptive Critic and Model Reference Me...

引用

International Joint Conference on Neural Networks 2003

作者： Lendaris, G.George Santiago, Roberta McCarthy, Jay Carroll, Michael Systems Science Ph.D. Program Electrical and Computer Engineering Portland State University Portland OR 97201 United States Systems Science Ph.D. Program Portland State University Portland OR 97201 United States Electrical Engineering Department Portland State University Portland OR 97201 United States Computational Neuroscience University of Chicago Chicago IL United States

Dynamic programming (DP) is a principled way to design optimal controllers for certain classes of nonlinear systems;unfortunately, DP is computationally very expensive. The Reinforcement Learning methods known as Adaptive Critics (AC) provide computationally feasible means for performing approximate Dynamic programming (ADP). The term 'adaptive ' in A C refers to the critic 's improved estimations of the Value Function used by DP. To apply DP, the user must craft a Utility function that embodies all the problem-specific design specifications/criteria. Model Reference Adaptive Control methods have been successfully used in the control community to effect on-line redesign of a controller in response to variations in plant parameters, with the idea that the resulting closed loop system dynamics will mimic those of a Reference Model. The work reported here 1) uses a reference model in ADP as the key information input to the Utility function, and 2) uses ADP off-line to design the desired controller. Future work will extend this to on-line application. This method is demonstrated for a hypersonic shaped airplane called LoFL YTE®;its handling characteristics are natively a little "hotter" than a pilot would desire. A control augmentation subsystem is designed using ADP to make the plane "feel like " a better behaved one, as specified by a Reference Model. The number of inputs to the successfully designed controller are among the largest seen in the literature to date.

关键词： Adaptive control systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：