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Interdigital-Gated HEMT Structure for High Frequency Devices

Interdigital-Gated HEMT Structure for High Frequency Devices

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International RF and Microwave Conference, RFM

作者： Abdul Manaf Hashim Seiya Kasai Tamotsu Hashizume Hideki Hasegawa Department of Microelectronic and Computer Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Research Center for Integrated Quantum Electronics Graduate School of Information Science and Technology Hokkaido University Sapporo Hokkaido Japan

Interdigital-gated AlGaAs/GaAs high electron mobility transistor (HEMT) structure was used to investigate the interaction between the drifting carrier plasma waves and electromagnetic (EM) waves. It was shown theoretically that the interaction in the range from microwave to terahertz (THz) at room temperature should produce negative conductance characteristics when the carrier drift velocity slightly exceeds the phase velocity of EM waves. S-parameter reflection measurements were carried out at room temperature for a frequency range from 1 to 20 GHz and a drastic change in conductance was observed at 5GHz and 10GHz with the increase of drain-source voltage. Large conductance change over 1000 mS/mm was obtained and it showed a peak at a certain frequency. The peak position could be controlled by changing the pitch size of the interdigital gates. These characteristics can be used for high frequency applications such as high-speed switching devices although a feature size of our interdigital-gated HEMT device is much larger than conventional HEMT device

关键词： HEMTs Frequency Plasma temperature Temperature distribution Gallium arsenide MODFETs Plasma waves Electromagnetic scattering Microwave devices Electron mobility

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Identification of the Mechanical Parameters for Servo Drive

Identification of the Mechanical Parameters for Servo Drive

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Tae-suk Kwon Seung-ki Sul Hiroshi Nakamura Kazuhiro Tsuruta School of Electrical Engineering & Computer Science Seoul National University Seoul South Korea Corporate Research and Development Center YASKAWA Electric Corporation Kitakyushu Japan Faculty of Engineering Kyushu Sangyo University Fukuoka Japan

This paper describes a novel identification technique of the moment of inertia and the viscous friction coefficient for a servo drive system. It is developed based on the basic dynamic equation of a mechanical system, and it uses the torque reference of a speed controller and the actual rotating speed of machine for the identification. Regardless of the simplicity of the techniques it is robust to external disturbances such as measurement noise, Coulomb friction, mechanical resonance of the drive system. The identified inertia and friction can be used for auto-tuning of the gains in the speed controller and the disturbance observer. The effectiveness of the proposed method is proved by the computer simulation and experimental results

关键词： Servomechanisms Friction Equations Mechanical systems Torque control control systems Noise robustness Current measurement Mechanical variables measurement Noise measurement

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Investigation of lateral charge distribution of 2-bit SONOS memory devices using physically separated twin SONOS structure

Investigation of lateral charge distribution of 2-bit SONOS ...

引用

IEEE International Conference on Microelectronic Test Structures

作者： Byung Yong Choi Choong-Ho Lee Yong Kyu Lee Hyungcheol Shin Jong Duk Lee Byung-Gook Park Dong-Won Kim Suk-Kang Sung Se Hoon Lee Byung-Kyu Cho Tae-Yong Kim Eun Suk Cho Jong Jin Lee Donggun Park ISRC and School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea Device Research Team Semiconductor Research Center Samsung Electronics Company Limited Yongin si Gyeonggi South Korea Department of Electrical Engineering University of Stanford Stanford CA USA

The lateral charge distribution on 2-bit SONOS memory can be readily characterized using physically separated twin SONOS structure. The damascene gate and outer sidewall process successfully contribute to make the twin SONOS structure down to 80nm gate regime. Its lateral charge distribution is estimated through the SS and V/sub th/ shifts for forward and reverse reading and confirmed by the comparison with a conventional (non-separated) SONOS structure.

关键词： SONOS devices Fabrication Current measurement Size control Channel hot electron injection Degradation Process control computer science Charge carrier processes Hot carriers

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Biologically Motivated Face Selective Attention System

Biologically Motivated Face Selective Attention System

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International Joint Conference on Neural Networks (IJCNN)

作者： Woong-Jae Won Sang-Woo Ban Jaekyoung Moon Minho Lee School of Electrical Engineering and Computer Science Kyungpook National University Taegu South Korea Department of Information & Communication Engineering Dongguk University Gyeongju Gyeongbuk South Korea Sensor Technology Research Center Taegu South Korea

In this paper, we propose a biologically motivated face preference selective attention system to identify a face within complex natural scenes. In order to localize a face in natural scenes, we have developed a task-specific selective attention model which integrates the conventional bottom-up saliency map with punishment and rewarding functions, with top-down attention and bias signals, according to a given task. The color-filtered intensity, color opponent, and edge of the winner color opponent features are intensified for the biasing of skin color in order to identify a face. computer experimental results have shown that the proposed model successfully identifies multiple faces within a complex environment. In addition, we have implemented a robot vision system which will be used for an autonomous mental development system.

关键词： Face detection Humans Biological system modeling Intelligent robots Layout Autonomous mental development Intelligent sensors Machine vision Humanoid robots Visual system

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CTH03-1: Reduced Complexity Receiver Design for MIMO-OFDM Systems with Space-Time-Frequency Coding

CTH03-1: Reduced Complexity Receiver Design for MIMO-OFDM Sy...

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IEEE Globecom 2006

作者： Shaohua Li Defeng Huang K. B. Letaief Zucheng Zhou Nokia Research Center Beijing China School of Electrical Electronic & Computer Engineering University of Western Australia Crawley WA Australia Center for Wireless Information Technology Electrical and Electronic Engineering Department Hong Kong University of Science and Technology Hong Kong China Department of Electronic Engineering Tsinghua University Beijing China

Space-time-frequency coding is an important technology for OFDM (orthogonal frequency division multiplexing) under MIMO (multiple-input and multiple-output) channels to achieve high speed wireless multimedia transmission. Traditionally, multiple DFT (discrete Fourier transform) blocks, each corresponding to one receive antenna, are employed at the receiver of a MIMO-OFDM system with space-time- frequency coding, which induces huge complexity. In this paper, we propose a pre-DFT processing scheme for such a system, where the number of DFT blocks employed can be adjusted, thus enabling effective complexity and performance tradeoff. Simulation results will show that, under some channel conditions, the performance of the proposed scheme can be almost as good as the traditional optimal scheme but with much lower complexity.

关键词： Discrete Fourier transforms OFDM Receiving antennas Transmitters System performance Array signal processing Space technology MIMO Data engineering Frequency diversity

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TWIn SONOS TransistOR (TWISTOR) for 2-bit/cell SONOS memory technology

TWIn SONOS TransistOR (TWISTOR) for 2-bit/cell SONOS memory ...

引用

21st IEEE Non-Volatile Semiconductor Memory Workshop 2006, NVSMW 2006

作者： Choi, Byung Yong Park, Byung-Gook Lee, Jong Duk Shin, Hyungcheol Lee, Yong Kyu Sung, Suk-Kang Lee, Se-Hoon Chae, Heesoon Lee, Jong Jin Bai, Keun Hee Kim, Dong-Dae Kim, Dong-Won Lee, Choong-Ho Park, Donggun ISRC School of Electrical Engineering and Computer Science Seoul National University Seoul 151-742 Korea Republic of Department of Electrical Engineering Stanford University Stanford CA 94305-4070 United States Device Research Team Semiconductor R and D Center Samsung Electronics Co. Yongin-City Gyeonggi-Do 449-711 Korea Republic of Process Development Team Semiconductor R and D Center Samsung Electronics Co. Yongin-City Gyeonggi-Do 449-711 Korea Republic of Test Engineering Team Semiconductor R and D Center Samsung Electronics Co. Yongin-City Gyeonggi-Do 449-711 Korea Republic of

In terms of nonvolatile memory device characteristics, the optimal device parameters for the TWISTOR (TWIn SONOS TransistOR) structure are investigated. Through this study, we show the best performance of 80nm gate TW... 详细信息

ISBN: (纸本)1424400260

关键词： Nonvolatile storage

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Implementation of a Transcutaneous Charger for Fully Implantable Middle Ear Hearing Device

Implementation of a Transcutaneous Charger for Fully Implant...

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

作者： H.G. Lim Y.H. Yoon C.W. Lee I.Y. Park B.S. Song J.H. Cho School of Electrical Engineering & Computer Science Kyungpook National University Daegu South Korea Advanced Research Center for Recovery of Human Sensibility Kyungpook National University Daegu South Korea Department of Rehabilitation Science & Technology School of Rehabilitation Science Daegu University Daegu South Korea

A transcutaneous charger for the fully implantable middle ear hearing device (F-IMEHD), which can monitor the charging level of battery, has been designed and implemented. In order to recharge the battery of F-IMEHD, the electromagnetic coupling between primary coil at outer body and secondary coil at inner body has been used. Considering the implant condition of the F-IMEHD, the primary coil and the secondary coil have been designed. Using the resonance of LC tank circuit at each coil, transmission efficiency was increased. Since the primary and the secondary coil are magnetically coupled, the current variation of the primary coil is related with the impedance of internal resonant circuit. Using the principle mentioned above, the implanted module could transmit outward the information about charging state of battery or coupling between two coils by the changing internal impedance. As in the demonstrated results of experiment, the implemented charger has supplied the sufficient operating voltage for the implanted battery within about 10 mm distance. And also, it has been confirmed that the implanted module can transmit information outward by control of internal impedance

关键词： Ear Auditory system Coils Batteries Impedance Magnetic resonance RLC circuits Coupling circuits Electromagnetic coupling Implants

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Time-Frequency Analysis of Endogenous Calf Skeletal Muscle Vibromyograms

Time-Frequency Analysis of Endogenous Calf Skeletal Muscle V...

引用

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

作者： A.A. Goddard G. Madhavan J.P. Cole M.L. Fowler K.J. McLeod Clinical Science and Engineering Research Center Department of BioengineeringInnovative Technologies ComplexThomas J. Watson School of Engineering and Applied Science State University of New York Binghamton NY USA Department of Electrical and Computer Engineering Thomas J. Watson School of Engineering and Applied Science State University of New York Binghamton NY USA

Calf skeletal muscle pump activity is essential for maintaining adequate venous and interstitial fluid flows in the dependent body. Correspondingly, failure of this extracorporeal pump leads to a host of acute and chronic physiological complications. The focus of this study is to assess the calf muscle pump contractility, more specifically through analysis of soleus muscle firing dynamics, in supine and seated positions, utilizing vibromyography (VMG). We have extended our previous investigations which relied on Fourier analysis of VMG recordings by utilizing wavelet-based time-frequency analysis to characterize the intrinsically non-stationary peripheral postural muscle dynamics during quiet sitting. Our objective was to identify the fibers types responsible for muscle pump activity during sitting, by looking for significant increases in activity in specific muscle fiber groups when a subject assumes an upright position from recumbency, and examine their temporal dynamics

关键词： Time frequency analysis Muscles Pumps Blood Heart Fluid flow Humans Extremities Fluid dynamics Wavelet analysis

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ZnO Nanowire Field-Effect Transistors: Ozone-Induced Threshold Voltage Shift and Multiple Nanowire Effects

ZnO Nanowire Field-Effect Transistors: Ozone-Induced Thresho...

引用

IEEE Conference on Nanotechnology

作者： Sanghyun Ju Kangho Lee D.B. Janes Jianye Li R.P.H. Chang Myung-Han Yoon A. Facchetti T.J. Marks School of Electrical and Computer Engineering The Institute for Nanoelectronics and Computing and Birck Nanotechnology Center Purdue University West Lafayette IN USA Department of Materials Science and Engineering and Materials Research Center Northwestern University Evanston IL USA Department of Chemistry and the Materials Research Center and the Institute for Nanoelectronics and Computing Northwestern University Evanston IL USA

ISBN: (纸本)1424400775

ZnO nanowire field-effect transistors (NW-FETs) employing single nanowires were fabricated, using a self-assembled superlattice (SAS) as the gate insulator. Both depletion-mode and enhancement-mode ZnO NW-FETs were fabricated and characterized. An electrostatic model is proposed to describe observed threshold voltage shift upon optimum ozone treatment. Temperature-dependent current-voltage characteristics of depletion-mode ZnO NW-FETs verify this model, indicating the existence of body current through ZnO nanowires with low activation energy. In addition, NW-FETs that use multiple ZnO nanowires and a SiO 2 gate insulator were fabricated to achieve higher on-current without significant degradation in on-off current ratio, threshold voltage shift, and subthreshold slopes.

关键词： Zinc oxide FETs Threshold voltage Insulation Self-assembly Superlattices Synthetic aperture sonar Electrostatics Current-voltage characteristics Degradation

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Oxide confined vertical cavity laser - depleted optical thyristor

Oxide confined vertical cavity laser - depleted optical thyr...

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Conference on Lasers and Electro-Optics (CLEO)

作者： W. K. Choi D. G. Kim Y. W. Choi Kent D. Choquette S. Lee D. H. Woo Microwave and Lightwave Telecommunications Laboratory School of Electrical and Electronic Engineering Chung-Ang University Seoul South Korea Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Photonics Research Center Korea Institute of Science and Technology Seoul South Korea

This study shows the optical properties of a vertical cavity laser(VCL) - depleted optical thyristor(DOT) fabricated using selective oxidation. The oxide confined PnpN VCL-DOT clearly shows the nonlinear s-shaped curr... 详细信息

ISBN: (纸本)1557528136

关键词： Optical sensors Optical device fabrication Nonlinear optics Stimulated emission Optical switches Optical reflection Vertical cavity surface emitting lasers

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