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Computational Optical Sensing and Imaging, COSI 2007

作者： Watson, Jonathan M. Wissmann, Patrick Oh, Se Baek Stenner, Michael Barbastathis, George Department of Mechanical Engineering Massachusetts Institute of Technology Massachusetts Avenue Cambridge MA 02139 United States Department of Industrial Engineering Technical University of Aachen Germany Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daejon Korea Republic of Department of Electrical and Computer Engineering Optical Sciences Center University of Arizona Tucson AZ United States

We present two analytical methods for evaluating the response of optical systems utilizing volume holograms for three-dimensional spatial heterodyning. These methods enable the evaluation of system behavior with stand... 详细信息

ISBN: (纸本)1557528381

关键词： Holograms

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Novel optoelectronic methodology to facilitate development of MEMS

Novel optoelectronic methodology to facilitate development o...

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63rd Annual Meeting of the institute of Navigation 2007

作者： Pryputniewicz, Ryszard J. Marinis, Ryan T. Klempner, Adam R. Hefti, Peter Mechanical Engineering Department CHSLT- Center for Holographic Studies and Laser Micro-mechatronics Worcester Polytechnic Institute Worcester MA 01609 United States Department of Mechanical Engineering CHSL WPI NEST Program WPI Department of Electrical Computer Engineering SPIE SEM MEMS Nanotechnology Division SEM

ISBN: (纸本)1604232862

Development of microelectromechanical systems (MEMS), and structures they interact with, especially for navigation applications constitutes one of the most challenging tasks in today's micromechanics. In addition to design, analysis, and fabrication capabilities, this task also requires advanced test methodologies for determination of functional characteristics of MEMS to enable verification as well as refinement and optimization of their designs. More specifically, development of MEMS requires sophisticated design, analysis, fabrication, testing, and characterization tools. These tools can be categorized as analytical, computational, and experimental. Solutions using the tools from any one category alone do not usually provide necessary information on MEMS and extensive merging, or hybridization, of the tools from different categories is used. One of the approaches employed in the development of MEMS, as well as other complex structures of contemporary interest, is based on a combined use of the analytical, computational, and experimental solutions (ACES) methodology. Development of this methodology was made possible by recent advances in optoelectronic methodology, which was coupled with the state-of-the-art computational methods, to offer a considerable promise for effective development of the design of MEMS. This approach facilitates characterization of dynamic and thermomechanical behavior of MEMS components, packages for MEMS, and other complex material structures. In this paper, we describe the novel optoelectronic methodology that facilitates development of MEMS and illustrate its use with representative examples by emphasizing their functional operation/ characteristics, reliability, and durablity.

关键词： Optoelectronic devices

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Dynamic bandwidth allocation based on online traffic prediction for real-time MPEG-4 video streams

Eurasip Journal on Advances in Signal Processing

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Eurasip Journal on Advances in Signal Processing 2007年 2007卷

作者： Liang, Yao Han, Mei Department of Electrical and Computer Engineering Advanced Research Institute Virginia Polytechnic Institute and State University Arlington VA 22203 United States

The distinct characteristics of variable bit rate (VBR) video traffic and its quality of service (QoS) constraints have posed a unique challenge on network resource allocation and management for future integrated networks. Dynamic bandwidth allocation attempts to adaptively allocate resources to capture the burstiness of VBR video traffic, and therefore could potentially increase network utilization substantially while still satisfying the desired QoS requirements. We focus on prediction-based dynamic bandwidth allocation. In this context, the multiresolution learning neural-network-based traffic predictor is rigorously examined. A well-known-heuristic based approach RED-VBR scheme is used as a baseline for performance evaluation. Simulations using real-world MPEG-4 VBR video traces are conducted, and a comprehensive performance metrics is presented. In addition, a new concept of renegotiation control is introduced and a novel renegotiation control algorithm based on binary exponential backoff (BEB) is proposed to efficiently reduce renegotiation frequency. Copyright © 2007 Hindawi Publishing Corporation. All rights reserved.

关键词： Frequency allocation

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HIDE -- A Web-based Hydrological Integrated Data Environment

HIDE -- A Web-based Hydrological Integrated Data Environment

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ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Nimmy Ravindran Yao Liang Advanced Research Institute Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University VA USA

One of the challenging tasks in data management and interoperation is efficient data integration. Data integration in scientific community is affected by heterogeneities of the data and diversity of the participating data sources. We have developed a web-based data integration framework, HIDE, for hydrology datasets and data sources. The system is built on an extended XML mediator architecture with modular methodology and software engineering practices of simplicity, extensibility and flexibility. HIDE promotes on-demand data integration and carries functionalities such as search and data access, data integration and remote data visualization. Registration of a new data source to HIDE for integration involves minimal effort of adding a few XML metadata files. The system can help hydrologists to access and share, and dynamically integrate data from diverse data sources quickly. HIDE was primarily built for integrating data from National Weather services with datasets from various autonomous organizations.

关键词： Ontologies XML Mediation Hydrology Software engineering Environmental management Geology Geographic Information Systems Floods Artificial intelligence

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Improving Key Distribution forWireless Sensor Networks

Improving Key Distribution forWireless Sensor Networks

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NASA/ESA Conference on Adaptive Hardware and Systems (AHS)

作者： Noureddine Mehallegue Emi Garcia Ahmed Bouridane Gang Qu The Institute of Electronics Communications and Information Technology Queen''s University Belfast Belfast UK Electrical and Computer Engineering Department and Institute for Advanced Computer Studies University of Maryland College Park MD USA

Key management plays an essential role in achieving security in wireless sensor networks (WSNs). A range of new key distribution schemes have been suggested in an attempt to improve existing ones which are inappropriate for WSNs. However these schemes are still vulnerable when a certain number of sensor nodes are captured. The key distribution proposed in this paper makes use of coordinator sensor nodes, increasing the number of nodes that would need to be captured by an adversary. The analysis of our scheme against well known schemes such as the DDHV scheme shows a significant improvement in security.

关键词： Wireless sensor networks Data security Protection computer networks Distributed computing computer network management Protocols Authentication Information technology Educational institutions

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New Single Sustaining Driver for AC-PDP employing Voltage Stress Reduction Technique

New Single Sustaining Driver for AC-PDP employing Voltage St...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Ki-Bum Park Seong-Wook Choi Chong-Eun Kim Gun-Woo Moon Myung-Joong Youn Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

The single sustaining driver (SSD) for AC plasma display panel (AC-PDP) can simplify and optimize the circuit part of PDP, however it suffers from twice a high voltage stress of switches compared with conventional sustaining driver (SD). To solve this problem, new SSD employing the voltage stress reduction technique (VSRT) is proposed. By adjusting the gate timing with the proposed simple structure, the voltage stresses of all devices are effectively ensured at Vs. Therefore, the proposed SSD features a low cost, reduced heating, and a simple structure.

关键词： Voltage Stress Switches Switching circuits Resonance Inverters Driver circuits Costs Clamps Diodes

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Short Period Boost Current Transferring ZVS Boost Half Bridge Converter

Short Period Boost Current Transferring ZVS Boost Half Bridg...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Sung-Sae Lee Jae-Kuk Kim Chol-Ho Kim Gun-Woo Moon Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

A new boost half bridge (BHB) converter is presented. It is composed of additional switch, diode and coupled winding to boost inductor of BHB converter. Using the transferring of boost inductor current to coupled winding in a short period, the cancellation of ZVS current, which always occurs in convention one, is prevented. Therefore, the ZVS operation is easily achieved by leakage inductor current of transformer. Furthermore, since negatively build-up leakage inductor current of boost winding helps the ZVS operation throughout full load range, the excellent ZVS operation and high efficiency is achieved.

关键词： Zero voltage switching Inductors Switches Bridge circuits Switching converters Circuit faults Magnetic switching Uninterruptible power systems Moon Diodes

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Traffic Adaptive Uplink Scheduling Scheme for Relay Station in IEEE 802.16 Based Multi-Hop System

Traffic Adaptive Uplink Scheduling Scheme for Relay Station ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Ohyun Jo Dong-Ho Cho Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

To improve system throughput and extend coverage, multi-hop relaying is a promising technology in wireless communication systems. Thus, multi-hop relaying is world-widely gaining huge attention as a key research item. Nevertheless, it may cause longer delay and degrade resource efficiency at the cost of the benefits due to multi-hop relaying. In this paper, we propose a traffic adaptive uplink scheduling algorithm for relay station, which could be applied to the centralized multi-hop system such as IEEE 802.16 MMR efficiently. The proposed algorithm can overcome those defects of multi-hop relaying technology and enhance system performance.

关键词： Adaptive scheduling Relays Throughput Spread spectrum communication Communications technology Wireless communication Delay Degradation Scheduling algorithm System performance

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Software Robot in a PDA for Human Interaction and Seamless Service

Software Robot in a PDA for Human Interaction and Seamless S...

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Ye-Hoon Kim Se-Hyoung Cho Seung-Hwan Choi Jong-Hwan Kim Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

In this paper, a new architecture is proposed for the efficient human interaction with software robot (Sobot) in a PDA and the Sobot transmission between PDAs. Sobot can move to any mobile device through a wireless communication network. This ability is required to follow its user by moving itself to a device in his/her new location. Sobot as an artificial creature, has genetic code which is a set of computerized codes representing the personality. It has an internal state which consists of motivation, homeostasis, and emotion. The data set of genetic code and current internal state are transmitted through the network when it moves to the other device. A main server manages IP addresses of registered devices, Sobot's data set, and Sobot's location for the transmission. To demonstrate the effectiveness of the proposed scheme, Sobot is implemented in windows mobile environment of PDA such that it can interact with a human being and move to the other mobile device without spatial limitation.

关键词： Human robot interaction Genomics Bioinformatics Personal digital assistants Mobile robots Genetics Virtual environment computer architecture Network servers Autonomous agents

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Hybrid Energy-Saving Algorithm Considering Silent Periods of VoIP Traffic for Mobile WiMAX

Hybrid Energy-Saving Algorithm Considering Silent Periods of...

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IEEE International Conference on Communications (ICC)

作者： H.-H. Choi D.-H. Cho Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

Recent broadband wireless access systems apply voice over Internet protocol (VoIP) for their voice services, so a mobile station (MS) requires an efficient energy-saving algorithm for VoIP services to prolong its battery lifetime. The IEEE 802.16e system called Mobile WiMAX provides the power saving class (PSC) of type II as an energy-saving algorithm for VoIP service, but it is not originally designed to consider silent periods of VoIP traffic. Therefore, we propose a new hybrid energy-saving algorithm suitable for VoIP services with silence suppression, which basically follows PSC II during talk-spurt periods, but uses the truncated binary exponential algorithm of PSC I during silent periods. The analysis and simulation results show that the proposed hybrid scheme reduces power consumption effectively during silent periods while satisfying the maximum allowable end-to-end delay and low packet drop probability constraints with respect to the quality of service (QoS) of VoIP.

关键词： WiMAX Media Access Protocol Mobile computing Electronic mail Internet telephony Traffic control Analytical models Quality of service Telecommunication traffic Communications Society

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