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SiGe-Si-based optoelectronic devices for high-speed communication applications

SiGe-Si-based optoelectronic devices for high-speed communic...

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Topical Meeting on Silicon Monolithic Integrated Circuits in RF systems

作者： P. Bhattacharya O. Qasaimeh Jae-Sung Rieh Solid Stated Electronics Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Agere Systems Breinigsville PA USA IBM Corporation Hopewell Junction NY USA

The principles and properties of some SiGe-Si-based optoelectronic devices are described. These include photodiodes, photoreceivers and modulators. InGaAs-GaAs quantum dot lasers grown directly on Si also exhibit prom... 详细信息

关键词： Silicon germanium Germanium silicon alloys Optoelectronic devices Optical amplifiers Bandwidth Photodiodes Diodes Heterojunction bipolar transistors Solids Gallium arsenide

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Rate scalable video coding using a foveation-based human visual system model

Rate scalable video coding using a foveation-based human vis...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zhou Wang Ligang Lu A.C. Bovik Laboratory for Image and Video Engineering LIVE Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA Video and Image Systems IBM Thomas J. Watson Research Center Yorktown Heights NY USA

Recently, there have been two interesting trends in image and video coding research. One is to use human visual system (HVS) models to improve the current state-of-the-art coding algorithms by better exploiting the properties of the intended receiver. The other is to design rate-scalable video codecs, which allow the extraction of coded visual information at continuously varying bit rates from a single compressed bitstream. We follow these two trends and propose a foveation scalable video coding (FSVC) algorithm, which supplies good quality-compression performance as well as effective rate scalability to support simple and precise bit rate control. A foveation-based HVS model plays a key role in the algorithm. The algorithm is amenable to the inclusion of various HVS models and adaptable to different video communication applications.

关键词： Video coding Humans Visual system Video compression Image coding Partitioning algorithms Bit rate Scalability Bandwidth Discrete wavelet transforms

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Wavelet-based foveated image quality measurement for region of interest image coding

Wavelet-based foveated image quality measurement for region ...

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IEEE International Conference on Image Processing

作者： Z. Wang A.C. Bovik L. Lu Laboratory for Image and Video Engineering (LIVE) Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA Video and Image Systems IBM Thomas J. Watson Research Center Yorktown Heights NY USA

Region of interest (ROI) image and video compression techniques have been widely used in visual communication applications in an effort to deliver good quality images and videos at limited bandwidths. Most image quality metrics have been developed for uniform resolution images. These metrics are not appropriate for the assessment of ROI coded images, where space-variant resolution is necessary. The spatial resolution of the human visual system (HVS) is highest around the point of fixation and decreases rapidly with increasing eccentricity. Since the ROIs are usually the regions "fixated" by human eyes, the foveation property of the HVS supplies a natural approach for guiding the design of ROI image quality measurement algorithms. We have developed an objective quality metric for ROI coded images in the wavelet transform domain. This metric can serve to mediate the compression and enhancement of ROI coded images and videos. We show its effectiveness by applying it to an embedded foveated image coding system.

关键词： Image quality Video compression Spatial resolution Image resolution Humans Image coding Visual communication Bandwidth Visual system Eyes

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Energy efficiency in energy-limited wireless networks for session-based multicasting

Energy efficiency in energy-limited wireless networks for se...

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IEEE Conference on Vehicular Technology (VTC)

作者： J.E. Wieselthier G.D. Nguyen A. Ephremides Information Technology Division Naval Research Laboratory Inc. Washington D.C. DC USA Electrical & Computer Engineering Department and Institute for Systems Research University of Maryland College Park MD USA

We consider source-initiated multicast session traffic in an ad hoc wireless network, under hard constraints on the available transmission energy as well as on bandwidth and transceiver resources. We compare energy-limited and energy-efficient communications, and we illustrate the impact of these overlapping (and sometimes conflicting) considerations on network operation. We use alternative energy-based cost metrics with two algorithms for the construction of multicast trees. These algorithms are evaluated on the basis of several appropriate performance measures. A remarkable result is that they deliver a volume of traffic that is nearly independent of the bandwidth and transceiver resources over a wide range of parameter values.

关键词： Energy efficiency Intelligent networks Wireless networks Transceivers Peer to peer computing Bandwidth Multicast algorithms Information technology Laboratories Telecommunication traffic

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Internet-based remote sensing and manipulation in micro environment

Internet-based remote sensing and manipulation in micro envi...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： C.K.M. Fung W.J. Li I. Elhajj Ning Xi Center for Micro and Nano Systems Chinese University of Hong Kong New Territories Hong Kong China Robotics and Automation Laboratory Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

ISBN: (纸本)0780367367

Recent developments in the Internet have significantly increased the human capability to reach and obtain information from remote locations. In parallel, the advent of micro sensors and actuators makes it possible for humans to sense and act in a microenvironment. Combined, the Internet and MEMS will produce a new technology for humans to sense and act in remote microenvironments, allowing the potential development of micro teleoperation and micro automation technologies. These new technologies have potential impact on several fields, including remote micro automation and biomedical engineering. In this paper, we will present our ongoing development of polyvinylidene fluoride (PVDF) sensors that can be used for force-reflective control of micromechanical devices over the Internet. Internet based teleoperation between Hong Kong and Michigan State was demonstrated using an event-based control scheme, which ensured stability and synchronization. Control was enhanced by multimedia feedback, which included, in addition to the traditional video, force feedback. The force fed back augmented the limited information supplied by visual feedback. We believe this project will eventually make a great impact to the globalization of MEMS foundries because it will allow global users to micro-assemble and micro-manipulate surface micromachined devices from their laboratories, and hence, reduce the time from design to production significantly.

关键词： Internet Remote sensing Force feedback Humans Micromechanical devices Automation Automatic control Force control Actuators Biomedical engineering

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Development of InP-based test structures for optical MEMS applications

Development of InP-based test structures for optical MEMS ap...

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International Symposium Semiconductor Device Research (ISDRS)

作者： M. Pruessner R. Grover L. Calhoun R. Ghodssi Laboratory for Physical Sciences College Park MD USA The Institute for Systems Research ISR University of Maryland College Park MD USA Department of Electrical and Computer Engineering University of Maryland College Park MD USA

ISBN: (纸本)0780374320

III-V semiconductors such as InP have a direct bandgap and thus allow active optical devices such as lasers and optical amplifiers to be realized. The monolithic integration of InP based active optical devices with MEMS actuators will enable a new generation of versatile wavelength division multiplexed (WDM) devices from lossless switches to tunable lasers and optical filters to be realized at the 1.55 /spl mu/m communications wavelength. While the electro-mechanical properties of silicon are well known,, those of InP must first be studied before InP-based optical micro-electro-mechanical systems (MEMS) can be realized. This can be done by the M-Test, which utilizes electrostatically actuated beams to obtain bending and stress parameters of thin films. An applied voltage between a beam and substrate causes the beam to bend down toward the substrate. The electrostatic force increases as 1/g/sup 2/ where g is the beam-to-substrate gap. The mechanical bending force of the beam is proportional to k(/spl Delta/g) where /spl Delta/g is the change in beam to substrate gap and k is the spring constant of the beam. The spring constant k is dependent on both material properties as well as beam geometry. Because the electrostatic and mechanical forces increase at different rates, it should be clear that an instability point exists at which the two forces no longer balance and the beam is pulled in to the substrate. This instability is known to occur at 2/3 the original beam to substrate gap. By measuring the pull in voltage for various beam geometries, Young's modulus and intrinsic stress of the beam material can be found. Both properties are fundamental for MEMS design.

关键词： Testing Micromechanical devices Substrates Optical filters Optical films Indium phosphide Optical devices Stimulated emission Semiconductor optical amplifiers Wavelength division multiplexing

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The impact of directional antennas on energy-aware, session-based multicasting in ad hoc wireless networks

The impact of directional antennas on energy-aware, session-...

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MILCOM, Military Communications Conference

作者： J.E. Wieselthier G.D. Nguyen A. Ephremides Information Technology Division Naval Research Laboratory Inc. Washington D.C. DC USA Electrical and Computer Engineering Department and Institute for Systems Research University of Maryland College Park MD USA

ISBN: (纸本)0780372255

In our earlier studies we developed several algorithms for broadcast and multicast tree construction for session traffic in all-wireless networks. The Broadcast Incremental Power (BIP) and Multicast Incremental Power (MIP) algorithms are "node-based" schemes that exploit the "wireless multicast advantage" provided by the use of omnidirectional antennas. In this paper, we study broadcasting and multicasting when directional antennas are used. Alternative approaches to implementing algorithms based on BIP and MIP are presented, and their energy efficiency is evaluated. It is shown that considerable savings in energy can be achieved by using directional antennas, especially by using the Directional-BIP (D-BIP) and Directional MIP (D-MIP) schemes, which exploit directional antenna properties throughout the tree construction process.

关键词： Directional antennas Multicast algorithms Energy efficiency Peer to peer computing Transceivers Broadcasting Telecommunication traffic Intelligent networks Wireless networks Information technology

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Integrated design of linear alternator/engine system for HEV auxiliary power unit

Integrated design of linear alternator/engine system for HEV...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： W. Cawthorne P. Famouri N. Clark Division of General Motors Allison Transmission Indianapolis IN USA Electromechanical Systems Laboratory Department of Computer Science & Electrical Engineering West Virginia University Morgantown WV USA Engine and Emissions Research Center Department of Mechanical & Aerospace Engineering West Virginia University USA

ISBN: (纸本)0780370910

For a cleaner environment and efficient operation, vehicles rely more and more heavily on electrical power generation for success, and the advent of the hybrid electric vehicle has emphasized the need to re-examine efficient, compact generators for use in vehicle propulsion. Crankless linear engines coupled to linear alternators have gained recent visibility and West Virginia University (WVU) has already enjoyed success in the research of spark-ignited and compression ignition linear engines coupled to permanent magnet alternators. This research will provide an integrated design approach for the alternator which accounts for the characteristics of the engine used as the prime mover and the interactions between the engine and the alternator.

关键词： Alternators Hybrid electric vehicles Internal combustion engines Stirling engines Power generation Propulsion Hybrid power systems Permanent magnets Batteries Power system reliability

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Static and dynamic behavior of saturation-induced saliencies and their effect on carrier signal based sensorless AC drives

Static and dynamic behavior of saturation-induced saliencies...

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

作者： F. Briz M.W. Degner A. Diez R.D. Lorenz Department of Electrical Computer & Systems Engineering University of Oviedo Gijon Spain Ford Research Laboratory Ford Motor Company Limited Dearborn MI USA Depts of ME & ECE University of Wisconsin Madison Madison WI USA

This paper analyzes the origin and the behavior of saturation-induced saliencies in induction machines, and their influence on carrier signal injection based sensorless techniques. The modeling of saturation-induced saliencies is necessary for the estimation of flux position, while the minimization of their influence is desired for the estimation of rotor position. Specifically focusing on rotor position estimation, there are two ways to achieve this minimization, the first being the use of a machine design that reduces the magnitude of the undesired saturation-induced saliencies and the second being the compensation in the estimator of the undesired saturation-induced saliencies. The modeling of saturation-induced saliencies, not only statically, but also dynamically, i.e. when the operating point of the machine changes, is addressed by this paper.

关键词： Induction machines Sensorless control Stators Voltage Frequency estimation Drives systems engineering and theory AC motors Laboratories Signal analysis

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BIFURCATION CONTROL AND NONSMOOTH FEEDBACK

BIFURCATION CONTROL AND NONSMOOTH FEEDBACK

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第二十届中国控制会议

作者： Hua O.Wang Yiguang Hong Laboratory for Intelligent and Nonlinear Control(LINC)Department of Electrical and Computer Engineering Duke University DurhamNC 27708U.S.A and Center for Nonlinear and Complex Systems Dept.of Control Science and Engineering Huazhong University of Science and Technology Institute of Systems Sciences Chinese Academy of Sciences

In the paper,we exhibit the usefulness of nonlinearity in two aspects:analysis of nonlinear dynamics and nonsmooth feedback *** illustrative examples are given to show how the new bifurcation p

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