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2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA2008

作者： Sakata, Atsunori Yamazato, Takaya Okada, Hiraku Katayama, Masaaki Department of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan EcoTopia Science Institute Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Center for Transdisciplinary Research Niigata University 8050 Ikarashi 2-no-cho Niigata-shi 950-2181 Japan

ISBN: (纸本)9781424422043

This paper compares the throughput performance of orthogonal frequency division multiple access (OFDM) and multicarrier CDMA (MC-CDMA) in inter-vehicle communications (IVC). In particular, we compare the throughputs in a situation where hidden terminals are no longer negligible. We encounter the situation in an intersection where two or more cars are crossing by. Due to the hidden terminal degradation, poor throughput performance is obtained with OFDM scheme. On the other hand, MC-CDMA has a resistance to the hidden terminals as it can support simultaneous packets. However, the transmission data rate is much slow because of the spreading. Thus the total throughput may not be as high as the OFDM. As results, we show that throughput of the OFDM is better than the MC-CDMA in a low traffic region. We found that the OFDM can communicate only with the nearest car. On the contrary, when the traffic is high, the MC-CDMA shows better throughput than the OFDM. In addition, we show that many packets can be received simultaneously in MC-CDMA. These results lead to the conclusion that when we want high-speed communication to a few cars, the OFDM is a good candidate. And when low speed but simultaneous communication with many surrounding cars is our desire, then the MC-CDMA is our choice. As MC-CDMA has a compatibility with an OFDM by setting a spreading factor to one, MC-CDMA system may be the preferable choice for IVC. © 2008 IEEE.

关键词： Throughput

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Pseudo virtual passive dynamic walking and effect of upper body as counterweight

Pseudo virtual passive dynamic walking and effect of upper b...

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2008 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Fumihiko Asano Zhi-Wei Luo RIKEN Bio Mimetic Control Research Center Nagoya Japan Department of Computer Science and Systems Engineering Graduate School of Engineering Kobe University Kobe Japan

ISBN: (纸本)9781424420575

This paper investigates the effect of an upper body on efficient dynamic bipedal walking utilizing its natural dynamics. We introduce an upper body as a one-link torso and add it to a simple biped model by means of a bisecting hip mechanism (BHM). We first mathematically analyze the effect of the upper body with the BHM as a counterweight and discuss how it affects natural swinging motion of the swing leg. Second, we propose a simple method for generating efficient dynamic bipedal gait imitating the property of virtual passive dynamic walking, and numerically analyze the gait efficiency. Simulation results show that the walking system exhibits period-doubling bifurcation, and we discuss how the efficiency changes in the multiple-period gait.

关键词： Legged locomotion Robots Mechanical energy Leg Hip Torso Joints

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The Third International Conference on human-robot interaction

The Third International Conference on human-robot interactio...

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作者： Fong, Terry Dautenhahn, Kerstin Scheutz, Matthias Demiris, Yiannis Intelligent Robotics Group NASA Ames Research Center Department of Artificial Intelligence School of Computer Science University of Herfordshire Herfordshire United Kingdom Adaptive Systems Research Group University of Herfordshire Herfordshire United Kingdom Department of Cognitive Science Computer Science and Informatics Cognitive Science Program Indiana University Bloomington IN United States Intelligent Robotics Team Department of Electrical Engineering Imperial College London London United Kingdom

The third international conference on Human-Robot Interaction (HRI-2008) was held in Amsterdam, The Netherlands, March 12-15, 2008. The theme of HRI-2008, "living with robots," highlights the importance of the technical and social issues underlying human-robot interaction with companion and assistive robots for long-term use in everyday life and work activities. More than 250 researchers, practitioners, and exhibitors attended the conference, and many more contributed to the conference as authors or reviewers. HRI-2009 will be held in San Diego, California, from March 11-13, 2009. Copyright © 2008, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Human robot interaction

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Computational nanomechanics and thermal transport in nanotubes and nanowires

Computational nanomechanics and thermal transport in nanotub...

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作者： Srivastava, Deepak Makeev, Maxim A. Menon, Madhu Osman, Mohamed Advanced Aerospace Materials and Devices Group UARC NASA Ames Research Center Moffett Field CA 94035-1000 United States Department of Physics Center for Computational Sciences University of Kentucky Lexington KY 40506 United States School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 United States

Representative results of computer simulation and/or modeling studies of the nanomechanical and thermal transport properties of an individual carbon nanotube, silicon nanowire, and silicon carbide nanowire systems have been reviewed and compared with available experimental observations. The investigated nanomechanical properties include different elastic moduli of carbon nanotubes, silicon nanowires, and silicon carbide nanowires, all obtained within their elastic limits. Moreover, atomistic mechanisms of elastic to plastic transition under external stresses and yielding of carbon nanotubes under experimentally feasible temperature and strain rate conditions are discussed in detail. The simulation and/or modeling results on thermal properties, presented in this work, include vibrational modes, thermal conductivity and heat pulse transport through single carbon nanotubes, and thermal conductivity of silicon nanowires. Copyright © 2008 American Scientific Publishers All rights reserved.

关键词： Carbon nanotubes

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Evaluation of Si wire waveguide fabricated by parallel plate RIE process using double layered EB resist containing C60

Evaluation of Si wire waveguide fabricated by parallel plate...

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2008 International Nano-Optoelectronics Workshop, iNOW 2008 in Cooperation With International Global-COE Summer school (Photonics Integration-Core Electronics: PICE) and 31st International Symposium on Optical Communications

作者： Inoue, Keita Nishiyama, Nobuhiko Enomoto, Haruki Tamura, Shigeo Maruyama, Takeo Arai, Shigehisa Dept. of Electrical and Electronic Engineering Tokyo Institute of Technology Meguro-ku Tokyo 152-8552 Japan Technical Department Tokyo Institute of Technology Meguro-ku Tokyo 152-8552 Japan Quantum Nanoelectronics Research Center Tokyo Institute of Technology Meguro-ku Tokyo 152-8552 Japan School of Electrical and Computer Engineering College of Science and Engineering Kanazawa University Kakuma-machi Kanazawa Ishikawa 920-1192 Japan

ISBN: (纸本)9781424426560

By applying a double layered EB resist containing C60, we could form fine vertical shaped rectangular wire waveguide on silicon on insurator (SOl) by parallel plate reactive-ion-etching (RIE). The propagation loss single-mode Si wire waveguide for TE mode was obtained to be 4.5 dB/cm at 1550 nm, which is the lowest value those fabricated by parallel plate RIE. ©2008 IEEE.

关键词： Reactive ion etching

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Laser-induced current transients in silicon-germanium HBTs

Laser-induced current transients in silicon-germanium HBTs

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作者： Pellish, Jonathan A. Reed, Robert A. McMorrow, Dale Melinger, Joseph S. Jenkins, Phillip Sutton, Akil K. Diestelhorst, Ryan M. Phillips, Stanley D. Cressler, John D. Pouget, Vincent Pate, Nicholas D. Kozub, John A. Mendenhall, Marcus H. Weller, Robert A. Schrimpf, Ronald D. Marshall, Paul W. Tipton, Alan D. Niu, Guofu Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37203 United States Naval Research Laboratory Washington DC 20375 United States School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States L'Intégration du Matariau Au Système University of Bordeaux Talence France Free Electron Laser Center Vanderbilt University Nashville TN United States Institute for Space and Defense Electronics Vanderbilt University Nashville TN 37203 United States Electrical and Computer Engineering Department Auburn University Auburn AL 36849 United States

Device-level current transients are induced by injecting carriers using two-photon absorption from a subbandgap pulsed laser and recorded using wideband transmission and measurement equipment. These transients exhibit three distinct temporal trends that depend on laser pulse energy as well as the transverse and vertical charge generation location. The nature of the current transient is controlled by both the behavior of the subcollector-substrate junction and isolation biasing. However, substrate potential modulation, due to deformation of the subcollector-substrate depletion region, is the dominant mechanism affecting transient characteristics. © 2006 IEEE.

关键词： Power quality

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A Neuro-Fuzzy controller for Rotary Cement Kilns

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IFAC Proceedings Volumes 2008年第2期41卷 13259-13264页

作者： Maryam Fallahpour Alireza Fatehi Babak N. Araabi Morteza Azizi Control & Intelligent Processing Center of Excellence School of Electrical & Computer Eng. University of Tehran Tehran Iran Advanced Process Automation & Control (APAC) Research Group Electrical Engineering Faculty K. N. Toosi University of Technology Tehran Iran Saveh Cement Co. Saveh Iran

In this paper, we design a neurofuzzy controller to control several variables of a rotary cement kilns. The variables are back-end temperature, pre-heater temperature, oxygen content and CO2 gas content of the kiln. The fuzzy control system, as an advanced control option for the kilns, is intended to minimize the operator interaction in the control process. The proposed fuzzy controller uses a neural network to optimize TSK-type fuzzy controller. Since there is no generally applicable analytical model for cement kilns, we use the real data derived from Saveh cement factory for the plant identification. A model, which is very similar to the real plant, is identified then; and the identified model is used for control design and simulations. Extensive simulation studies justify the effectiveness and applicability of the proposed control scheme in intelligent control of cement plant.

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CDMA slotted ALOHA System with Successive Interference Cancellation for Inter-Vehicle Communications

CDMA slotted ALOHA System with Successive Interference Cance...

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2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications (ISSSTA 2008), vol.1

作者： Atsunori SAKATA Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Department of Electrical Engineering and Computer Science Graduate School of Engineering University of Nagoya Nagoya Japan EcoTopia Science Institute University of Nagoya Nagoya Japan Center for Transdisciplinary Research Niigata University Niigata Japan

关键词： OFDM Multicarrier code division multiple access Throughput Multiaccess communication Interference cancellation Protocols Numerical models

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Objective measurement of perceived auditory quality in multichannel audio compression coding systems

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AES: Journal of the Audio engineering Society 2008年第1-2期56卷 3-16页

作者： Choi, Inyong Shinn-Cunningham, Barbara G. Chon, Sang Bae Sung, Koeng-Mo. AES Institute of New Media and Communications School of Electrical Engineering and Computer Science Seoul National University Seoul Korea Republic of Hearing Research Center Boston University Boston MA United States

Objective quality assessment methods have been used widely for the evaluation of audio coding systems. However, even though many different competing multichannel audio compression coding systems are being developed, most current quality assessment methods only predict results for monaural or stereo signals. A prediction method is introduced that can be used for multichannel audio compression coding systems. The method introduces three variables as measures of the degradations in spatial quality: interaural time difference (ITD) distortion, interaural level difference (ILD) distortion, and interaural cross-correlation coefficient (IACC) distortion. Simultaneously ten model output variables proposed in ITU-R BS. 1387-1 are extracted from binaural signals that are synthesized using head-related transfer functions. The prediction model is trained and verified using results from subjective listening tests of multichannel audio compression coding systems that were performed by participants in the MPEG audio group. This new model, using the three interaural and ten nonspatial statistics, shows encouraging results in the prediction of perceived quality.

关键词： Audio systems

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Joint channel decoding of spatially and temporally correlated data in wireless sensor networks

Joint channel decoding of spatially and temporally correlate...

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International Symposium on Information Theory and Its Applications, ISITA

作者： Kentaro Kobayashi Takaya Yamazato Hiraku Okada Masaaki Katayama Department of Electrical Engineering and Computer Science Graduate School of Engineering University of Nagoya Nagoya Japan EcoTopia Science Institute University of Nagoya Nagoya Japan Center for Transdisciplinary Research Niigata University Ikarashi Niigata Japan

ISBN: (纸本)9781424420681

In densely deployed wireless sensor networks, sensor observations are spatially correlated. Furthermore, the nature of physical phenomena constitutes a temporal correlation between transmitted observations of an individual sensor node. In this paper, we propose a joint iterative channel decoding scheme using turbo codes. The proposed decoder exploits the spatial and temporal correlations of two binary data sequences to achieve additional coding gain. Simultaneously exploiting the spatial and temporal correlation, the proposed decoder achieves large performance gain.

关键词： Wireless sensor networks Iterative decoding Sensor phenomena and characterization Electronic mail Turbo codes Power control Yttrium Information theory Application software Data engineering

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