检索结果-内蒙古大学图书馆

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

DCMSim: Didactic cache memory simulator 33

DCMSim: Didactic cache memory simulator

引用

33rd Annual Frontiers in Education, FIE 2003

作者： Cordeiro, Eduardo Santos Abdanur Stefani, Italo Giovani Do Amaral Pales Soares, Tays Cristina Da Silva Martins, Carlos Augusto Paiva Pontifical Catholic University of Minas Gerais Graduate Program in Computer Science 500 Av. Dom Cabral Coração Eucaristico Belo HarizonteMinas Gerais Brazil Pontifical Catholic University of Minas Gerais Graduate Program in Computer Science Graduate Program in Electrical Engineering 500 Av. Dom Cabral Coração Eucaristico Belo HarizonteMinas Gerais Brazil

ISBN: (纸本)0780379616

We present a functional and structural didactic simulator of Cache Memory Systems developed at the Pontifical Catholic University of Minas Gerais, Brazil. The development occurred during the undergraduate computer Architecture discipline, in the computer Science course. Its implementation is one part of a new didactic method, in which developers (students of the computer Architecture discipline) must learn the concepts and theory of the discipline topics to correctly apply them in the simulator. In our simulator, DCMSim, there are features to allow students to construct and verify knowledge, testing and comparing several different configurations and memory access traces. © 2003 IEEE.

关键词： Cache memory

来源：评论

学校读者我要写书评

暂无评论

A university-based web resource supporting the Xilinx University program

A university-based web resource supporting the Xilinx Univer...

引用

2003 IEEE International Conference on Microelectronic Systems Education, MSE 2003

作者： Shanblatt, Michael A. Foulds, Brian Kane, Patrick Acevedo, Anna Department of Electrical and Computer Engineering Michigan State University East LansingMI48824 United States Xilinx University Program Xilinx Corporation 2100 Logic Drive San JoseCA95124 United States

ISBN: (纸本)0769519733

The Xilinx University program is supported by a comprehensive web resource developed and maintained by students at the Department of electrical and computer engineering at Michigan State University. The site is designed specifically to support Xilinx University program partners using Xilinx products for teaching and research. Materials on laboratories, hardware, and other support resources that can help improve classroom preparation and interaction are provided for faculty. For students, hardware and software tutorials that shorten the learning curve, as well as a number of student projects are available. To tie everything together, a strong on-line support system, with an email question submission facility and FAQ's is in place to help find answers to questions or problems encountered in using Xilinx tools. © 2003 IEEE.

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

引用

Data Compression Conference, DCC 2003

作者： Tang, Wenye He, Tao Gibson, Jerry D. Globespan Virata Inc. 100 SchulzDrive Red BankNJ07701 United States Electrical Engineering Department Southern Methodist University DallasTX75275 United States Media Arts and Technology Program and Electrical and Computer Engineering University of California at Santa Barbara Santa BarbaraCA93106 United States

ISBN: (纸本)0769518966

In 1960, Campbell derived a quantity that he defined as the coefficient rate of a random process that involves the process spectral entropy. However, no potential applications of the coefficient rate were identified. Two new derivations of Campbell's rate coefficient rate are presented. One derivation solidifies the interpretation of this quantity as a coefficient rate and allows definition of an effective bandwidth for the process. The second derivation implies a new approach for realization adaptive source compression. The coefficient rate can be used for realization adaptive coefficient selection in a sequence of source representations. Furthermore, the effective bandwidth is designated as Campbell bandwidth and contrasted with Fourier bandwidth and Shannon bandwidth. Several specific examples are presented that illustrate the differences among the three quantities. © 2003 IEEE.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

Analysis of the trade-offs between manual and computer-based stereology/classification

Analysis of the trade-offs between manual and computer-based...

引用

Annual Northeast Bioengineering Conference

作者： Z. Markowitz M.H. Loew Biomedical Engineering Program Department of Electrical and Computer Engineering George Washington University Washington D.C. DC USA

Estimation of volume, surface area, area, length and number in stereology is based on a manual count of the number of intersections between the feature of interest and a specific low-resolution geometrical test probe. It is usually a tedious and imprecise process, hut benefits from the user's ability to identify the feature of interest. In computer-based stereology, by contrast, a high-resolution test probe is used, generally yielding greater precision but suffering from imperfection of the automated classification. The trade-offs between manual and computer-based stereology are introduced and the conditions under which each is advantageous are defined.

关键词： Labeling Probes Testing Image processing Biology computing Pixel computer errors Humans Concurrent computing Biomedical computing

来源：评论

学校读者我要写书评

暂无评论

The trade-offs between manual and computer-based stereology/classification: application to estimates of volume fraction

The trade-offs between manual and computer-based stereology/...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Z. Markowitz M.H. Loew Biomedical Engineering Program Department of Electrical and Computer Engineering George Washington University Washington D.C. DC USA

Estimation of volume or the ratio of volumes in an image requires both mensuration and classification. The former is achieved through stereology - a set of techniques that estimate such parameters as area, volume, surface area, length, and number. Classification is achieved by extracting features that capture discriminating information (e.g., about tissue type). Both stereology and classification can be performed either manually or by computer. Manual techniques for the combination are based on coarse point counting (low resolution), but assumed perfect pixel classification. computer-based methods, on the other hand, rely on very fine point counting but in general suffer from imperfect pixel classification. This paper examines the interaction between manual and image processing-based approaches; in particular, we present a measure that combines the classification and measurement errors. Estimation of the variance is used to define the conditions under which each method is and is not advantageous despite its underlying error. This allows the user to choose a method that optimizes overall performance, given the human and machine capabilities available. Illustrations are given of cases in which each method can be preferable, as measured by the variance of the estimate of the performance that was inferred from the measurement.

关键词： Application software Parameter estimation Data mining Feature extraction Manuals Particle measurements Measurement errors Estimation error Optimization methods Humans

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

Asilomar Conference on Signals, Systems & computers

作者： Bo Wei J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California Santa Barbara CA USA

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： Speech coding programmable control Adaptive control Error correction Speech analysis System performance Spine Adaptive systems Wireless LAN Wireless application protocol

来源：评论

学校读者我要写书评

暂无评论

Artificial neural network-based pharmacodynamic population analysis in chronic renal failure

Artificial neural network-based pharmacodynamic population a...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： A.E. Gaweda A.A. Jacobs M.E. Brier J.M. Zurada Kidney Disease Program Louisville USA Department of Veteran Affairs Kidney Disease Program Department of Electrical and Computer Engineering University of Louisville Louisville KY USA

An artificial neural network (ANN)-based approach to pharmacodynamic population analysis presented. In pursuit of an optimal and cost-effective strategy for drug dosing in patients with renal failure, an ANN is applied to perform drug-dose-effect modeling. Such a model allows for versatile prediction of the response to the drug at the effect site and, subsequently, for adjusting the dosing regimen.

关键词： Artificial neural networks Failure analysis Intelligent networks Drugs Iron Diseases Predictive models Medical treatment Personnel Laboratories

来源：评论

学校读者我要写书评

暂无评论

Channel Estimation and Data Detection for MIMO-OFDM Systems

Channel Estimation and Data Detection for MIMO-OFDM Systems

引用

IEEE Global Telecommunications Conference GLOBECOM'03

作者： Yue, Jiang Kim, Kyeong Jin Gibson, Jerry D. Iltis, Ronald A. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 United States Nokia Research Center 6000 Connection Dr. Irving TX 75039 United States Media Arts and Technology Program Elec. and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065 United States Department of Electrical Engineering University of California Santa Barbara CA 93106-9560 United States

The use of multiple antennas at both the transmitter and receiver can significantly increase the channel capacity. These systems are called the multiple-input multiple-output (MIMO) systems. By using orthogonal frequency division multiplexing (OFDM) transmission techniques, the MIMO-OFDM system can achieve high spectral efficiency, which makes it an attractive candidate for high-data-rate wireless applications. In this paper, we propose a convolutionally coded MIMO-OFDM system with EM-based channel estimation and a QRD-M data detection algorithm. In our systems, one training symbol is transmitted from each transmit antenna for the MEMO channel estimation at the receiver. With the channel estimates available, we apply the QRD-M algorithm on the estimated channel matrix for suboptimal data detection with reasonable computational cost. The bit error rate (BER) and packet error rate (PER) performance of the MIMO-OFDM systems are compared. In the simulations, the bit error rate performance of our systems is 9 (or 5) dB better than that of uncoded (or coded) BLAST systems.

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

Intersubband Transitions in InxGa1-xAs/AlGaAs Multiple Quantum Wells for Long Wavelength Infrared Detection

引用

MRS Online Proceedings Library 2003年第1期744卷 1-6页

作者： Workman, Clayton L. Wang, Zhiming Ma, Wenquan George, Christi E. Panneer Selvam, R. Salamo, Gregory J. Zhou, Qiaoying Omar Manasreh, M. Center for Semiconductor Physics in Nanostructures (C-SPIN) and the Microelectronics-Photonics Program University of Arkansas Fayetteville USA Department of Electrical and Computer Engineering University of New Mexico Albuquerque USA

We report on intersubband transitions in InxGa1-xAs/AlGaAs multiple quantum wells (MQWs) grown by molecular beam epitaxy. The conduction band offset for this material system is larger than that of the well known GaAs/AlGaAs system, thus making it possible to design, grow, and fabricate quantum well infrared photodetectors operational beyond the 14 μm spectral region with minimized dark current. We have grown InxGa1-xAs/AlGaAs MQWs with indium compositions ranging from x = 0.08 to 0.20 verified by in situ RHEED oscillations, band offset measurements, and high-resolution X-ray diffraction. Band-to-band transitions were verified by photoluminescence measurements, and intersubband transitions were measured using Fourier transform infrared (FTIR) spectroscopy. Due to the high strain and introduction of dislocations associated with the high indium content, wells with indium compositions above ∼ 0.12 did not result in intersubband transitions at silicon doping levels of 2×1018 cm-3. A thick linear graded InxGa1-xAs buffer was grown below the MQW structures to reduce the strain and resulting dislocations. Intersubband transitions were measured in InxGa1-xAs wells with indium compositions of x = 0.20 and greater when grown on top of the linear graded buffer. In addition to these results, FTIR measurements on InGaAs/AlGaAs MQW multi-color, long-wavelength infrared detector structures are reported.

关键词：

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：