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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751-760 订阅

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The Heterogeneous Integration of InAlAs/InGaAs Heterojunction Diodes on GaAs: Impact of Wafer Bonding on Structural and elec.rical Characteristics

The Heterogeneous Integration of InAlAs/InGaAs Heterojunctio...

引用

Proceedings IEEE Lester Eastman Conference on High Performance Devices

作者： Kim, Tong-Ho Yi, Changhyun Brown, April S. Moran, Peter Kuech, Thomas Sch. of Elec./Computer Engineering Georgia Institute of Technology 791 Atlantic Drive Atlanta GA 30332 United States Department of Chemical Engineering University of Wisconsin 1415 Engineering Hall Madison WI 53706 United States

ISBN: (纸本)0780374789

We have investigated the influence of low temperature wafer bonding on the elec.rical and structural characteristics of InAlAs/InGaAs n-p heterojunction structures with similar structure to an emitter-base junction of InAlAs/InGaAs HBTs. Those n-p junction heterostructures were grown on an InP (100) substrate by solid source MBE. The effect of the wafer bonding process on the structural properties of the epitaxial layers was studied by comparing triple crystal x-ray diffraction measurements and simulations before and after bonding. In addition, the influence of the bonding process on the elec.rical properties of the heterojunction structures was assessed through SIMS analysis of both the bonded and non-bonded samples and an analysis of the I-V characteristics of diodes fabricated on both the bonded and non-bonded sample. These analyses show that the structural and elec.rical properties of the as-grown epitaxial layers were negligibly changed by the low temperature wafer transfer process.

关键词： Heterojunction bipolar transistors

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Structured channel estimation based decision feedback equalizers for sparse multipath channels with applications to digital TV receivers

Structured channel estimation based decision feedback equali...

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The Thirty-Sixth Asilomar Conference on Signals Systems and computers

作者： Özen, Serdar Hillery, William Zoltowski, Michael Nereyanuru, S.M. Fimoff, Mark Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907-1285 United States Zenith Electronics Corp. 2000 Millbrook Drive Lincolnshire IL 60069 United States

In this paper we investigate the performance of channel estimation based equalizers. We introduce two different channel estimation algorithms. Our first channel estimation sch.me is a novel structured channel impulse response (CIR) estimation method for sparse multipath channels. We call this novel CIR estimation method Blended Least Squares (BLS) which uses symbol rate sampled signals, based on blending the least squares based channel estimation and the correlation and thresholding based channel estimation methods. The second CIR estimation is called Variable Thresholding (VT), and is based on improving the output of the correlation and thresholding based estimation method. We then use these two CIR estimates to calculate the Decision Feedback Equalizer (DFE) tap weights. Simulation examples are drawn from the ATSC digital TV 8-VSB system [1] The delay spread for digital TV systems can be as long as several hundred times the symbol duration;however digital TV channels are, in general, sparse where there are only a few dominant multipaths.

关键词： Channel capacity

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A simulation study on the economic aspects of hybrid energy systems for remote islands in Thailand

A simulation study on the economic aspects of hybrid energy ...

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2002 IEEE Region 10 Conference on computers, Communications, Control and Power engineering

作者： Fung, Chun Che Rattanongphisat, Waraporn Nayar, Chem Sch. of Elec./Computer Engineering Curtin University of Technology GPO Box U 1987 Perth WA 6845 Australia Department of Physics Faculty of Sciences Naresuan University Muang Phitsanulok 65000 Thailand

This paper reports an investigation on the economic aspects of a typical hybrid energy system for remote islands in Thailand. In addition to the utilization of renewable energy, the study has based on different elec.rical load profiles simulating typical usage within a year. The simulation study and the optimization of hybrid energy system are based on a computer program called HOMER, as the simulation tool. From the economic analysis, the capital cost, net present cost and cost of energy are determined for different types of system configuration. Results from the study will be useful to aid business and investment decisions on choosing the most appropriate system for the island resorts.

关键词： Energy management

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Combined active and passive microwave sensing of ocean surface wind vector from TRMM

Combined active and passive microwave sensing of ocean surfa...

引用

Ocean's 2002 Conference and Exhibition

作者： Jones, W. Linwood Soisuvarn, Seubson Park, Jun Adams, Ian Kasparis, Takis Ctrl. Florida Remote Sensing Lab. University of Central Florida Sch. of Elec. Eng./Computer Science PO Box 162450 Orlando FL 32816-2450 United States

This paper presents a new ocean wind vector measurement technique that uses the combined passive and active microwave measurements respectively from the Tropical Rainfall Measuring Mission (TRMM) Microwave mager (TMI) and the Precipitation Radar (PR). The wind speed is inferred by TMI over a wide swath that includes the narrower PR swath. The PR scans cross-track ±18°;and near the swath edges, where the radar backscatter responds to both the magnitude and direction of the surface wind, we use the microwave radiometer estimate of wind speed and the measured sigma-0 at incidence angles greater than 15 degrees to derive wind direction. Because the PR provides only a single azimuth look, multiple possible wind direction solutions exist. The ability to selec. the proper (single) direction is beyond the scope of this paper;but comparisons are presented between the "closest" retrieved TRMM wind vectors and near-simultaneous wind vectors measured by the QuikSCAT satellite scatterometer to demonstrate the potential for measuring ocean surface vector winds.

关键词： Remote sensing

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Convergence detection in classification task of knowledge discovery process

Convergence detection in classification task of knowledge di...

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Portland International Conference on Management of engineering and Technology (PICMET)

作者： Brumen, Boštjan Welzer, Tatjana Golob, Izidor Jaakkola, Hannu University of Maribor Fac. of Elec. Eng./Computer Science Smetanova 17 2000 Maribor Slovenia Tampere University of Technology Pori Sch. of Technol. and Economics Pohjoisranta 11 28101 Pori Finland

The convergence detection in classification task of knowledge discovery was discussed. An adaptive incremental k-fold cross-validation method was used for this purpose. Three criteria in form of mathematical equations... 详细信息

ISBN: (纸本)1890843067

关键词： Knowledge engineering

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Microcharacterisation and Gas Sensing Properties of Mechanochemically Processed Nanosized Iron-doped SnO2

Microcharacterisation and Gas Sensing Properties of Mechanoc...

引用

First IEEE International Conference on Sensors - IEEE Sensors 2002

作者： Cukrov, L.M. McCormick, P.G. Galatsis, K. Wlodarski, W. Res. Ctr. Adv. Mineral/Mat. Proc. University of Western Australia Crawley WA Australia Sch. of Elec./Computer Engineering RMIT University Melbourne Vic. Australia

SnO2nanoparticles, undoped and doped with 1, 2 and 5 mol% Fe2O3}, were synthesized by mechanochemical processing. XRD analysis, for heat treatment at 600°C, revealed the average crystallite size to decrease progressively from 9.5 nm for undoped SnO2, to 5.3 nm for SnO2doped with 5% Fe2O3. HRTEM imaging revealed the presence of a number of crystal defects. Thin films for elec.rical characterisation were prepared by spin coating and subsequent annealing, with the response to O2measured. The resistance increased for increasing dopant concentration. The response to 1000 ppm, 1% and 10% O2was measured, with the highest response found for the 2%-doped sample. The 5%-doped sample exhibited a weak p-type response at 400°C and below, with a transition to n-type at 450°C. The thin films prepared from the Fe2O3-doped SnO2nanopowders have potential for the development of gas sensors.

关键词： Tin compounds

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Fingerprint Classification Based on the Extraction and Analysis of Pseudo Ridges

Fingerprint Classification Based on the Extraction and Analy...

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Proceedings of the First International Conference on Information Technology and Applications (ICITA 2002)

作者： Zhang, Qinzhi Yan, Hong Sch. of Elec./Info. Engineering University of Sydney New South Wales NSW 2006 Australia Department of Computer Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong University of Sydney Australia

ISBN: (纸本)1864671149

In this paper, we introduce a new approach to fingerprint classification based on the extraction and analysis of pseudo ridges. Since noise exists in most fingerprint images including those in the NIST databases, it is difficult to get the correct number and position of the singularities such as core or delta points which are widely used in current structural classification methods. By extracting the pseudo ridges and analyzing such traced curves, our method focuses on the extraction of the global ridge pattern. This method has been tested on the NIST-4 fingerprint database. For the 4000 images in this database, the classification accuracy is 85.4% with a 26.2% reject rate for the 4-class problem (combining Arch and Tented Arch as one class).

关键词： Pattern recognition

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Infinite and finite sample properties of set membership identification in a stochastic setting

Infinite and finite sample properties of set membership iden...

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41st IEEE Conference on Decision and Control

作者： Kitamura, Wataru Fujisaki, Yasumasa Bai, Er-Wei Grad. Sch. of Science and Technology Kobe University Nada Kobe 657-8501 Japan Dept. of Elec. and Comp. Engineering University of Iowa Iowa City IA 52242 United States

In this paper, infinite and finite sample properties of set membership identification are investigated in a stochastic setting. In particular, the size of the membership set in the presence of not only disturbance but also parameter uncertainty is estimated. The bounds of the disturbance and the parameter uncertainty are assumed to be tight as well as known, where tight means that the disturbance and the parameter uncertainty take a value around their extreme points with nonzero probability. The following results are obtained. (i) Infinite sample case: The size of the membership set converges to zero with probability one as the number of samples tends to infinity if the regressor is persistently exciting and the bounds of the disturbance and the parameter uncertainty are tight. This means that the membership set converges to the true but unknown parameter. (ii) Finite sample case: For a given number of samples, the size of the membership set can be estimated with a probabilistic confidence if the regressor is periodic and persistently exciting, and the bounds of the disturbance and the parameter uncertainty are tight. This result also clarifies the necessary number of samples such that the size of the membership set is less than a specified bound with a specified probability.

关键词： Parameter estimation

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Generation of Dense Disparity Maps in Stereo Vision

Generation of Dense Disparity Maps in Stereo Vision

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Proceedings of the 6th Joint Conference on Information sciences, JCIS 2002

作者： De Almeida Nogueira, Fernando Marques Tozzi, Clésio Luis Universidade Federal De Juiz De Fora Department of Project Fundaments CEP 36015.400 Juiz De Fora MG Brazil Universidade Estadual De Campinas Sch. of Elec./Computer Engineering CEP 13083.970 Campinas SP Brazil

ISBN: (纸本)0970789017

This paper presents an approach for stereo image matching that results in a dense and non-smooth disparity map. In the first step, a feature-based matching technique is applied and the obtained sparse disparity map is interpolated. In the second step the disparities in the smooth interpolated map are iteratively adjusted using an area-based matching technique and the disparity gradient. The obtained results show that disparities for non-smooth surfaces can be more accurately determined improving the description of three-dimensional scenes.

关键词： Stereo vision

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Development of power quality monitoring system with central processing sch.me

Development of power quality monitoring system with central ...

引用

2002 IEEE Power engineering Society Summer Meeting

作者： Won, Dong-Jun Chung, Il-Yop Kim, Joong-Moon Moon, Seung-Il Seo, Jang-Cheol Choe, Jong-Woong Sch. of Elec. Eng./Computer Science Seoul National University Seoul 151-742 Korea Republic of Electrotechnology R and D Center LG Industrial Systems Co. Ltd. Cheong Ju Korea Republic of

Power quality monitoring system is the cornerstone of power quality analysis, diagnosis and improvement. Power Quality (PQ) measurement concepts are evolving from instantaneous metering to continuous monitoring and recent developments in measurement technology make PQ monitoring system more powerful. That is, now it is possible to construct more flexible, reliable, fast and economical PQ monitoring system. So this paper presents an improved PQ monitoring system with central processing sch.me. Proposed system basically consists of one PQ analyzer and multiple PQ meters. PQ meter only acts as raw data acquisition system and PQ analyzer performs all calculations and analysis algorithm. The proposed system is very economical especially for large-scale system because the price of PQ meter can be dramatically lowered in this sch.me. PQ monitoring algorithms to catch steady-state trends and to detect PQ events are also proposed. The prototype of this system is constructed and real-time tests are performed using this system.

关键词： elec.ric power systems

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