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A maximum entropy framework that integrates word dependencies and grammatical relations for reading comprehension

A maximum entropy framework that integrates word dependencie...

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2006 Human Language technology Conference of the North American Chapter of the Association of Computational Linguistics, HLT-NAACL 2006

作者： Xu, Kui Meng, Helen Weng, Fuliang Human-Computer Communications Laboratory Dept. of Systems Engineering and Engineering Management The Chinese University of Hong Kong Hong Kong Research and Technology Center Robert Bosch Corp. Palo AltoCA94304 United States

Automatic reading comprehension (RC) systems can analyze a given passage and generate/extract answers in response to questions about the passage. The RC passages are often constrained in their lengths and the target answer sentence usually occurs very few times. In order to generate/extract a specific precise answer, this paper proposes the integration of two types of "deep" linguistic features, namely word dependencies and grammatical relations, in a maximum entropy (ME) framework to handle the RC task. The proposed approach achieves 44.7% and 73.2% HumSent accuracy on the Remedia and ChungHwa corpora respectively. This result is competitive with other results reported thus far. © 2006 Association for Computational Linguistics

关键词： Entropy

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On probing signal design for MIMO radar

On probing signal design for MIMO radar

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40th Asilomar Conference on Signals, systems, and computers, ACSSC '06

作者： Li, Jian Stoica, Petre Xie, Yao Dept. of Electrical and Computer Engineering University of Florida P O. Box 116130 Gainesville FL 32611 United States Dept. of Information Technology Systems Control Division Uppsala University P.O. Box 337 SE-75105 Uppsala Sweden

ISBN: (纸本)1424407850

A MIMO (multi-input multi-output) radar system, unlike a standard phased-array radar, can choose freely the probing signals transmitted via its antennas to maximize the power around the locations of the targets of interest, or more generally to approximate a given transmit beampattern, and also to minimize the cross-correlation of the signals reflected back to the radar by the targets of interest. In this paper, we show how the above desirable features can be achieved by designing the covariance matrix of the probing signal vector transmitted by the radar. Moreover, in a numerical study, we show that the proper choice of the probing signals can significantly improve the performance of adaptive MIMO radar techniques. Additionally, we demonstrate the advantages of several MIMO transmit beampattern designs, including a beampattern matching design and a minimum sidelobe beampattern design, over their phased-array counterparts.

关键词： Covariance matrix

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On the use of randomization for System of systems (SoS) design of intelligent machines

On the use of randomization for System of Systems (SoS) desi...

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2006 World Automation Congress, WAC'06

作者： Rubin, Stuart Lee, Gordon K. SPAWAR Systems Center 53560 Hull Street San Diego CA United States Dept. of Electrical and Computer Engineering San Diego State University 5500 Campanile Drive San Diego CA 92182-1326 United States

ISBN: (纸本)1889335339

This paper takes a System of systems (SoS) approach to the realization of machine intelligence. Random differences are learned by the system, generalized, and made available for subsequent replay in design transformations. It is empirically demonstrated that cross-domain symmetries can play a major role in design generation in particular and in the design of SoSs in general. The fundamental theory of randomization is the science, which underpins the practice. The approach is illustrated by an example of the design of a refrigeration system. Copyright - World Automation Congress (WAC) 2006.

关键词： systems analysis

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A low-power multithreaded processor for software defined radio

A low-power multithreaded processor for software defined rad...

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作者： Schulte, Michael Glossner, John Jinturkar, Sanjay Moudgill, Mayan Mamidi, Suman Vassiliadis, Stamatis University of Wisconsin Dept. of ECE 1415 Engineering Drive Madison WI 53706 United States Sandbridge Technologies 1 North Lexington Ave. White Plains NY 10512 United States Delft University of Technology Electrical Engineering Mathematics and Computer Science Department Delft Netherlands University of Wisconsin Madison Madison Embedded Systems and Architectures Group IEEE IEEE Computer Society Sandbridge Technologies Sandbridge Systems Software and Communications Software Groups Department of Electrical and Computer Engineering University OfWisconsin Madison Netherlands ACM

Embedded digital signal processors for software defined radio have stringent design constraints including high computational bandwidth, low power consumption, and low interrupt latency. Furthermore, due to rapidly evolving communication standards with increasing code complexity, these processors must be compiler-friendly, so that code for them can quickly be developed in a high-level language. In this paper, we present the design of the Sandblaster Processor, a low-power multithreaded digital signal processor for software defined radio. The processor uses a unique combination of token triggered threading, powerful compound instructions, and SIMD vector operations to provide real-time baseband processing capabilities with very low power consumption. We describe the processor's architecture and microarchitecture, along with various techniques for achieving high performance and low power dissipation. We also describe the processor's programming environment and the SB3010 platform, a complete system-on-chip solution for software defined radio. Using a super-computer class vectorizing compiler, the SB3010 achieves real-time performance in software on a variety of communication protocols including 802.11b, GPS, AM/FM radio, Bluetooth, GPRS, and WCDMA. In addition to providing a programmable platform for SDR, the processor also provides efficient support for a wide variety of digital signal processing and multimedia applications. © 2006 Springer Science + Business Media, LLC.

关键词： Program processors

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Performance of DS Time Hopping Ultra Wideband systems with Diversity

Performance of DS Time Hopping Ultra Wideband Systems with D...

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12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications

作者： Yuhua Zhao George P. Efthymoglou Okechukwu C. Ugweje Dept. of Electrical Engineering Miami University Oxford OH 45056 USA Dept. of Technology Education and Digital Systems University of Piraeus Greece Dept. of Electrical and Computer Engineering The University of Akron Akron OH 44325 USA

In this paper, a direct sequence (DS) time hopping (TH) ultra wideband (UWB) communications system, denoted as DS-TH-UWB is introduced and analyzed. This is a hybrid technique combining the conventional time hoping and direct sequence techniques. The system is analyzed in terms of the signal-to-noise plus interference ratio (SNIR) and bit error rate (BER) performance. In particular, we provide analytical expressions for the SNIR and BER as a function of several system parameters. The performance of the proposed system is compared with other techniques. Furthermore, the impact of diversity on the performance is demonstrated. Numerical results indicate that the BER performance of the DS-TH-UWB system is superior to the other techniques and can be improved significantly with the use of diversity.

关键词： Wideband

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Head detection and tracking for the car occupant's pose recognition

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19th International Conference on Industrial, engineering and Other Applications of Applied Intelligent systems, IEA/AIE 2006

作者： Lee, Jeong-Eom Kim, Yong-Ouk Kim, Sang-Jun Jang, Min-Soo Lee, Seok-Joo Park, Min Chul Park, Gwi-Tae Dept. of Electrical Engineering Korea University Seoul Korea Republic of Interdisciplinary Programs of Mechatronics Korea University Seoul Korea Republic of School of Computer Engineering Sejong University Seoul Korea Republic of Hyundai Autonet Co. Ltd. Korea Republic of Systems Technology Division KIST Korea Republic of

ISBN: (纸本)3540354530

This paper describes a Vision-based Occupant Pose Recognition (VOPR) system, which can ensure a safe airbag deployment. Head detection and its tracking are necessary for occupant's pose recognition in the car, since the position of occupuit's head provides valuable Information, such as his pose, size, position, and so on. We use the stereo cameras to extract a disparity map. Against variable lighting conditions including the night drive, we adopt infrared illumination as well as normal one. Results suggest that VOPR system is reliable and performs reasonably well. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Pattern recognition

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ISHM implementation for Constellation systems

ISHM implementation for Constellation Systems

引用

AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference

作者： Figueroa, Fernando Holland, Randy Schmalzel, John Duncavage, Dan Crocker, Alan Alena, Rick NASA Stennis Space Center Stennis Space Center MS 39529 Rowan University Dept. of Electrical and Computer Engineering Glassboro NJ 08028 NASA Johnson Space Center Houston TX 77058 NASA Ames Research Center Moffett Field CA 94035 Science and Technology Division EA41 Stennis Space Center MS 39529 AIAA Department of Electrical and Computer Engineering Rowan University Glassboro NJ 08028 International Space Station Program OD NASA Johnson Space Center Houston TX 77058 Systems Division Mission Operations Directorate DF NASA Johnson Space Center Houston TX 77058 Intelligent Systems Division MS 269-4 Moffett Field CA 94035

ISBN: (纸本)1563478188

This paper addresses methodic implementation of a credible ISHM capability for elements of Constellation systems. ISHM capability must be implemented by a combination of on-board and ground elements, each contributing to determining the health of systems in the most effective manner. Implementation of ISHM capability must evolve continuously to reach higher and higher levels of functional capability. The implication is that a sustainable approach must be defined in order to accomplish a believable capability. This paper describes the methodology, the elements, and the technology to implement ISHM capability throughout the life cycle of elements of Constellation systems, reaching beyond individual elements that might have a limited life while the constellation moves on.

关键词： Spacecraft propulsion

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Efficient active sonar multitarget tracking

Efficient active sonar multitarget tracking

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OCEANS 2006 - Asia Pacific

作者： Mušicki, Darko Xuezhi, Wang Ellem, Richard Fletcher, Fiona Melbourne Systems Laboratory Dept. of Electrical and Computer Engineering University of Melbourne Melbourne Australia Maritime Operations Division Defence Science and Technology Organisation PO Box 1500 Edinburgh SA 5111 Australia Intelligence Surveillance and Reconnaissance Division Defence Science and Technology Organisation PO Box 1500 Edinburgh SA 5111 Australia

ISBN: (纸本)1424401380

The active sonar environment presents a challenge for any tracking system. Multipath propagation and the fact that targets are, in general, extended objects mean that multiple measurements may be obtained for each target in the surveillance region. In addition, other objects and random scatterers introduce clutter measurements. Whilst pre-processing such as clustering and classification of detections can assist in significantly reducing the number of measurements, there may still be multiple measurements resulting from a single target. This also applies in a multitarget environment, where multiple measurements may be received from each target. Automatic target tracking, which uses measurements in consecutive scans to initiate tracks, generate a large number of false tracks. The key problem for a tracker becomes that of false track discrimination, i.e. confirming true tracks and terminating false tracks. This paper investigates the performance of three trackers for multitarget tracking in the active sonar environment, each using a different data association paradigm. These are the Global Nearest Neighbor (GNN) data association, Linear Multitarget Integrated Probabilistic Data Association (LMIPDA) and Nearest Neighbour Joint Probabilistic Data Association (NNJPDA). A simulation study of these algorithms in a simulated active sonar environment is presented. ©2006 IEEE.

关键词： Target tracking

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Silicon-based integrated MOSFETS and MESFETS: A new paradigm for low power, mixed signal, monolithic systems using commercially available SOI

Silicon-based integrated MOSFETS and MESFETS: A new paradigm...

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作者： Yang, Jinman Balijepalli, Asha Thornton, Trevor J. Vandersand, James Blalock, Benjamin J. Wood, Michael E. Mojarradi, Mohammad M. Arizona State University Dept. of Electrical Engineering PO Box 876206 Tempe AZ 85287-6206 United States University of Tennessee Dept. of Electrical and Computer Engineering Knoxville TN 37996-2100 United States SPAWAR Systems Center Code 2876 49375 Ashburn Rd San Diego CA 92152-7633 United States Jet Propulsion Laboratory California Institute of Technology Mail Stop 303-300 4800 Oak Grove Drive Pasadena CA 91109-8099 United States

Metal Semiconductor Field Effect Transistors fabricated using compound semiconductor materials have important applications in high-speed/low-noise communication systems. However, their integration densities are low compared to silicon technologies, and it is difficult to combine them with conventional CMOS for single-chip, mixed-signal circuit applications. In this paper we describe how silicon-on-insulator MESFETs can be fabricated alongside conventional MOSFETs using a commercially available silicon-on-insulator foundry. The process flow for the integrated MOSFETS and MESFETs is presented. Measurements from MESFETs fabricated using a commercial foundry demonstrate good depletion-mode device operation. The measured data confirms a square-law behavior for the saturated drain current, which can be reproduced using readily available MESFET models for Spice circuit simulation. The Spice model is applied to a simple differential-pair amplifier and the modeled results compared to measured data. © World Scientific Publishing Company.

关键词： MOSFET devices

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On the reliability issues of RF CMOS devices

On the reliability issues of RF CMOS devices

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ICSICT-2006: 2006 8th International Conference on Solid-State and Integrated Circuit technology

作者： Wong, Hei Fu, Yue Liou, J.J. Yue, Yun Iwai, Hiroshi Dept. of Electronic Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Frontier Collaborative Research Center Tokyo Institute of Technology Nagatsuta Yokohama 226-8502 Japan Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32816 United States RF/MS Design Group Conexant Systems Palm Bay FL 32905 United States

ISBN: (纸本)1424401615

Although multi-finger MOS structures have demonstrated very attractive behaviors for high-frequency analog circuit applications, the shared drain and source regions for adjacent gate fingers have led to current crowding and results in the finger number-dependent current-voltage characteristics. In addition, the high current density spots near the drain region would deteriorate the MOS reliability in several aspects. Present results suggest that the common drain regions should be wider and more heavily doped in order to alleviate these effects. © 2006 IEEE.

关键词： CMOS integrated circuits

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