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A linear dynamic affect-expression model: Facial expressions according to perceived emotions in mascot-type facial robots

A linear dynamic affect-expression model: Facial expressions...

引用

16th IEEE International Conference on Robot and Human Interactive Communication, RO-MAN

作者： Hui, Sung Lee Jeong, Woo Park Su, Hun Jo Myung, Jin Chung IEEE Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon Korea Republic of

ISBN: (纸本)1424416345

It is expected that robots will be widely exposed to humans in the near future. Emotional communication is very important in human-robot interaction, as well as human-human interaction. Facial expression is an emotional expression method between humans, and it also enables human to recognize a robot's emotional state. Although there are lots of previous research regarding facial expressions, it is not easily applicable to different shapes of robot faces, if the number and types of the robot's control points are varied. In addition, the natural connection between emotions has not been considered or has been inefficiently implemented in previous research. In this paper, we propose a linear dynamic affect-expression model for continuous change of expression and diversifying characteristics of expressional changes. Therefore, the proposed model allows a robot's facial expression and expression changes to more closely resemble those of humans, and this model is applicable to various mascot-type robots irrespective of the number and types of robot's control points. ©2007 IEEE.

关键词： Human robot interaction

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A Converter Topology to Interface Low Voltage Solar/Fuel Cell Type Energy Sources to Electric Utility

A Converter Topology to Interface Low Voltage Solar/Fuel Cel...

引用

23rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2008), vol.1

作者： L. Palma P. Enjeti N. Denniston J. L. Duran-Gomez Department of Electrical Engineering Universidad de Concepción Casilla 160 C Correo 3 Chile Power Electronics & Fuel Cell Power Systems Laboratory Department of Electrical & Computer Engineering Texas A&M University College Station 77843-3128 USA Power Electronics Laboratory Graduate Studies and Research Division Chihuahua Institute of Technology Chih. 31310 México

Solar and Fuel Cells are some of the most promising energy sources for future energy generation. However due to their variable and low magnitude voltage a power conditioner capable of providing a large voltage gain is required. This is especially true in applications supplying power to AC loads or the electric grid in which a voltage gain around 8 p.u. is required. The traditional approach to implement the power conditioner in single phase applications is by cascading an isolated DC-DC converter with a DC-AC inverter. However this results in a system of larger size and cost due to the need of a high frequency transformer and the presence of a large second harmonic component in the DC link current. An alternative to the traditional approach is presented in this paper in which a high gain transformer-less DC-DC converter and Z-source inverter are used. It is shown that due to inductor losses the maximum voltage gain of the Z-source inverter is limited. And therefore a two stage approach is a more suitable solution. It is also shown, by means of simulations, that by combining the Z-source inverter with the transformer less DC-DC converter a system with improved performance is obtained.

关键词： Topology Low voltage Fuel cells Power industry Inverters DC-DC power converters Solar power generation Power supplies Costs Frequency

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Towards energy optimization in environmental wireless sensor networks for lossless and reliable data gathering

Towards energy optimization in environmental wireless sensor...

引用

2007 IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems, MASS

作者： Fei, Huang Yao, Liang Advanced Research Institute Department of Electrical and Computer Engineering Virginia Tech. Arlington VA 22203 United States

ISBN: (纸本)1424414555

Wireless sensor networks (WSNs) have provided many new opportunities for scientific studies and discoveries through continuously monitoring our world. However, one of the most critical challenges in environmental WSNs is their severe power limitation. While several approaches exist to overcome energy limitation, this paper focuses on systematically exploring temporal correlation in environmental observations through data compression approach for lossless, reliable and energy-efficient data gathering in WSNs for environmental monitoring. In light of this, we illustrate our developed approach and demonstrate its efficacy through an empirical study using real-world sensed data. ©2007 IEEE.

关键词： Wireless sensor networks

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ParalleX: A study of a new parallel computation model

ParalleX: A study of a new parallel computation model

引用

21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Gao, Guang R. Sterling, Thomas Stevens, Rick Hereld, Mark Zhu, Weirong Department of Electrical and Computer Engineering University of Delaware Center for Advanced Computing Research California Institute of Technology Department of Computer Science Louisiana State University Mathematics and Computer Science Division Argonne National Laboratory

ISBN: (纸本)1424409101

This paper proposes the study of a new computation model that attempts to address the underlying sources of performance degradation (e.g. latency, overhead, and starvation) and the difficulties of programmer productivity (e.g. explicit locality management and scheduling, performance tuning, fragmented memory, and synchronous global barriers) to dramatically enhance the broad effectiveness of parallel processing for high end computing. In this paper, we present the progress of our research on a parallel programming and execution model - mainly, ParalleX. We describe the functional elements of ParalleX, one such model being explored as part of this project. We also report our progress on the development and study of a subset of ParalleX - the LITL-X at University of Delaware. We then present a novel architecture model - Gilgamesh II - as a ParalleX processing architecture. A design point study of Gilgamesh II and the architecture concept strategy are presented. © 2007 IEEE.

关键词： Parallel processing systems

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A 0.2-mW 2-Mb/s digital transceiver based on wideband signaling for human body communications

A 0.2-mW 2-Mb/s digital transceiver based on wideband signal...

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作者： Song, Seong-Jun Cho, Namjun Yoo, Hoi-Jun IEEE Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Republic of

This paper presents a low-power wideband signaling (WBS) digital transceiver for data transmission through a human body for body area network applications. The low-power and highspeed human body communication (HBC) utilizes a digital transceiver chip based on WBS and adopts a direct-coupled interface (DCI) which uses an electrode of 50-Ω impedance. The channel investigation with the DCI identifies an optimum channel bandwidth of 10 kHz to 100 MHz. The WBS digital transceiver exploits a direct digital transmitter and an all-digital clock and data recovery (CDR) circuit. To further reduce power consumption, the proposed CDR circuit incorporates a low-voltage digitally-controlled oscillator and a quadratic sampling technique. The WBS digital transceiver chip with a 0.25-μm standard CMOS technology has 2-Mb/s data rate at a bit error rate of 1.1 × 10-7, dissipating only 0.2 mW from a 1-V supply generated by a 1.5-V battery. © 2007 IEEE.

关键词： Transceivers

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Improvement of turn-off characteristics in ZnO TFT's by introducing hydrogen during MOCVD growth

Improvement of turn-off characteristics in ZnO TFT's by intr...

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Functional Interfaces in Oxides - 2007 MRS Spring Meeting

作者： Jo, Jungyol Seo, Ogweon Choi, Hyoshik Jun, Chan Bong Ajou University Department of Electrical and Computer Engineering Suwon Korea Republic of NFC Samsung Advanced Institute of Technology Suwon Korea Republic of

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Layout-Accurate Design and Implementation of a High-Throughput Interconnection Network for Single-Chip Parallel Processing

Layout-Accurate Design and Implementation of a High-Throughp...

引用

IEEE Symposium on High Performance Interconnects

作者： Aydin O. Balkan Michael N. Horak Gang Qu Uzi Vishkin Electrical and Computer Engineering Department Institute for Advanced Computer Studies University of Maryland USA UMD

A mesh of trees (MoT) on-chip interconnection network has been proposed recently to provide high throughput between memory units and processors for single-chip parallel processing (Balkan et al., 2006). In this paper, we report our findings in bringing this concept to silicon. Specifically, we conduct cycle-accurate Verilog simulations to verify the analytical results claimed in (Balkan et al., 2006). We synthesize and obtain the layout of the MoT interconnection networks of various sizes. To further improve throughput, we investigate different arbitration primitives to handle load and store, the two most common memory operations. We also study the use of pipeline registers in large networks when there are long wires. Simulation based on full network layout demonstrates that significant throughput improvement can be achieved over the original proposed MoT interconnection network. The importance of this work lies in its validation of performance features of the MoT interconnection network, as they were previously shown to be competitive with traditional network solutions. The MoT network is currently used in an eXplicit multi-threading (XMT) on-chip parallel processor, which is engineered to support parallel programming. In that context, a 32-terminal MoT network could support up to 512 on-chip XMT processors. Our 8-terminal network that could serve 8 processor clusters (or 128 total processors), was also accepted recently for fabrication.

关键词： Multiprocessor interconnection networks Parallel processing Network-on-a-chip Throughput Silicon Hardware design languages Analytical models Network synthesis Pipelines Registers

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Design and implementation of a device network application for distributed line-crossing recognition

Design and implementation of a device network application fo...

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International Symposium Semiconductor Device Research (ISDRS)

作者： Chung-Ching Shen Roni Kupershtok Shuvra S. Bhattacharyya Neil Goldsman Department of Electrical and Computer Engineering and Institute for Advanced Computer Studies University of Maryland College Park USA

In this paper, we present a complete distributed sensor system design with features of low energy usage and small size. In this system, a distributed application for line-crossing recognition (LCR) is demonstrated as a concrete example. This system includes optimizations associated with algorithm streamlining, communication protocol configuration, and hardware/software implementation. We summarize our developed light-weight distributed algorithm for line-crossing recognition, together with its specific protocol implementation, and present the corresponding hardware implementation. We also describe a system prototype that we have built based on off-the-shelf devices, including a field programmable gate array (FPGA).

关键词： Protocols Hardware Field programmable gate arrays Sensor systems Application software Concrete Software algorithms Communication system software Distributed algorithms Software prototyping

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An Energy-Driven Design Methodology for Distributing DSP Applications across Wireless Sensor Networks

An Energy-Driven Design Methodology for Distributing DSP App...

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Real-Time Systems Symposium (RTSS)

作者： Chung-Ching Shen William Plishker Shuvra S. Bhattacharyya Neil Goldsman Department of Electrical and Computer Engineering and Institute for Advanced Computer Studies University of Maryland College Park USA

Wireless sensor network (WSN) applications have been studied extensively in recent years. Such applications involve resource-limited embedded sensor nodes that have small size and low power requirements. Based on the need for extended network lifetimes in WSNs in terms of energy use, the energy efficiency of computation and communication operations in the embedded sensor nodes becomes critical. Digital signal processing (DSP) applications typically require intensive data processing operations. They are difficult to apply directly in resource-limited WSNs because their operational complexity can strongly influence the network lifetime. In this paper, we present a design methodology for modeling and implementing DSP applications applied to wireless sensor networks. This methodology explores efficient modeling techniques for DSP applications, including acoustic sensing and data processing; derives formulations of energy-driven partitioning for distributing such applications across wireless sensor networks; and develops efficient heuristic algorithms for finding partitioning results that maximize the network lifetime. A case study involving a speech recognition system demonstrates the capabilities of our proposed methodology.

关键词： Design methodology Digital signal processing Wireless sensor networks Data processing Energy efficiency computer networks Embedded computing Acoustic applications Heuristic algorithms Partitioning algorithms

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Design Techniques for Streamlined Integration and Fault Tolerance in a Distributed Sensor System for Line-crossing Recognition

Design Techniques for Streamlined Integration and Fault Tole...

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International Conference on computer Communications and Networks (ICCCN)

Distributed sensor system applications (e.g., wireless sensor networks) have been studied extensively in recent years. Such applications involve resource-limited embedded sensor nodes that communicate with each other through self-organizing protocols. Depending on application requirements, distributed sensor system design may include protocol and prototype implementation. Prototype implementation is especially useful in establishing and maintaining system functionality as the design is customized to satisfy size, energy, and cost constraints. In this paper, we present a streamlined, application-specific approach to incorporating fault tolerance into a TDMA-based distributed sensor system for line-crossing recognition. The objective of this approach is to prevent node failures from translating into failures in the overall system. Our approach is specialized and light-weight so that fault tolerance is achieved without significant degradation in energy efficiency. We also present an asynchronous handshaking approach for providing synchronization between the transceiver and digital processing subsystem in sensor node. This provides a general method for achieving such synchronization with reduced hardware requirements and reduced energy consumption compared to conventional approaches, which rely on generic interface protocols. We demonstrate the capabilities of our approaches to fault tolerance and transceiver-processor integration through experiments involving a complete prototype wireless sensor network test-bed, and a distributed line-crossing recognition application that runs on this test-bed.

关键词： Fault tolerant systems Sensor systems Protocols Prototypes Wireless sensor networks Fault tolerance Testing Cost function Degradation Energy efficiency

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