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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Y. Shiraishi T. Yambe K. Sekine Y. Saijo Q. Wang H. Liu S. Nitta S. Konno N. Masumoto J. Nagatoshi S. Itoh Y. Park M. Uematsu M. Umezu D. Ogawa P. Olegario F. Sato M. Yoshizawa A. Tanaka K. Tabayashi H. Sasada T. Fujimoto D. Homma M. Higa Y. Hori Institute of Development Aging and Cancer University of Tohoku Sendai Japan Department of Mechanical Engineering Nippon Institute of Technology Saitama Japan Graduate School of Science and Engineering Waseda University Tokyo Japan Graduate School of Engineering University of Tohoku Sendai Japan Information Synergy Center University of Tohoku Sendai Japan Faculty of Symbiotic Systems Science Fukushima University Fukushima Japan Tohoku University Biomedical Engineering Research Organization (TUBERO) Sendai Japan Shibaura Institute of Technology Tokyo Japan Graduate School of Medicine University of Tohoku Sendai Japan Graduate School of Agriculture University of Tohoku Sendai Japan Toki Corporation Tokyo Japan

The authors have been developing a newly-designed totally-implantable artificial myocardium using a covalent shape-memory alloy fibre (Biometalreg, Toki Corporation), which is attached onto the ventricular wall and is also capable of supporting the natural ventricular contraction. This mechanical system consists of a contraction assistive device, which is made of Ti-Ni alloy. And the phenomenon of the martensitic transformation of the alloy was employed to achieve the physiologic motion of the device. The diameter of the alloy wire could be selected from 45 to 250 mum. In this study, the basic characteristics of the fiber of 150 mum was examined to design the sophisticated mechano-electric myocardium. The stress generated by the fiber was 400 gf under the pulsatile driving condition (0.4W, 1 Hz). Therefore it was indicated that the effective assistance might be achieved by using the Biometal shape-memory alloy fiber

关键词： Myocardium Shape memory alloys Cardiology Optical fiber devices Medical treatment Heart Biomedical imaging Biomedical engineering Thermal force Mechanical systems

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QoS-aware resource allocation and utilization technology in access networks

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Journal of the National institute of information and Communications technology 2005年第3-4期52卷 73-81页

作者： Koga, Hiroyuki Fukuda, Yutaka Haraguchi, Hiroaki Tsuru, Masato Oie, Yuji Kitakyusyu JGNII Research Center Collaborative Research Management Department Technology Division Yaskawa Information Systems Corporation Collaborative Research Management Department Information Science Center Kyushu Institute of Technology

Future pervasive ubiquitous networks will be constructed by various access networks such as wireless LAN and cellular networks. Such wireless access networks have a variety of capacity and dynamics compared with core networks, so that they have a significant impact on end-to-end communication in terms of quality of service. Therefore, we focus on the QoS-aware resource allocation and utilization technologies in access networks. In the present paper, we introduce our proposed intra-domain and inter-domain schemes to improve communication quality.

关键词： Resource allocation

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Safety stock positioning in supply chains with stochastic lead times

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Manufacturing and Service Operations Management 2005年第4期7卷 295-318页

作者： Simchi-Levi, David Zhao, Yao Engineering Systems Division Department of Civil and Environmental Engineering Massachusetts Institute of Technology Cambridge MA 02139 Department of Management Science and Information Systems Rutgers University Newark NJ 08903

We study the safety stock positioning problem in single-product multistage supply chains with tree network structures, where each stage controls its inventory using an installation continuous-time base-stock policy. External demands follow independent Poisson processes, and unsatisfied demands at each stage are fully back-ordered. The processing (e.g., production) cycle times and transportation lead times are assumed to be stochastic, sequential, and exogenously determined. We derive recursive equations for the backorder delays (because of stockout) at all stages in the supply chain. Based on the recursive equations, we characterize the dependencies of the backorder delays across different stages in the network, and develop insights into the impact of safety stock positioning in various supply chain topologies. We present approximations and algorithms to coordinate the base-stock levels in these supply chains, so as to minimize systemwide inventory cost subject to meeting certain service-level requirements of the external customers. © 2005 INFORMS.

关键词： Inventory control

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A Pure P2P Network Size Estimation Method using Network Measurements and Computer Simulation Experiments

A Pure P2P Network Size Estimation Method using Network Meas...

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The 19th International Teletraffic Congress-ITC19

作者： Satoshi Ohzahata Konosuke Kawashima Institute of Symbiotic Science and Technology Division of Systems and Information Technology Tokyo University of Agriculture and Technology 2-24-16 Naka-machi Koganei city Tokyo Japan Institute of Symbiotic Science and Technology Division of Systems and Information Technology Tokyo University of Agriculture and Technology 2-24-16 Naka-machi Koganei city Tokyo Japan

In this paper we estimate the size of the Winny network (one of the most popular pure P2P file sharing applications in Japan) using a combination of network measurements and computer simulation experiments. For the measurement analysis, we use an improved mark-recapture method to estimate the number of newly active Winny peers per unit time. We estimate the number of active peers in the Winny network by applying the actual measurement results to computer simulation experiments. The simulation results reveal that the Winny network had about 200,000 active Winny peers in October 2004.

关键词： estimation method, number of peers, pure P2P network, mark-recapture method

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Analysis of ensemble learning using simple perceptrons based on on-line learning theory

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systems and Computers in Japan 2005年第12期36卷 63-74页

作者： Miyoshi, Seiji Hara, Kazuyuki Okada, Masato Department of Electronic Engineering Kobe City College of Technology Kobe 651-2194 Japan Division of Electronics and Information Engineering Tokyo Metropolitan College of Technology Tokyo 140-0011 Japan Laboratory for Mathematical Neuroscience RIKEN Brain Science Institute Wako 351-0198 Japan Intelligent Cooperation and Control PRESTO Japan Science and Technology Agency Wako 351-0198 Japan IEEE Institute of Electrical Engineers of Japan Japanese Neural Network Society Physical Society of Japan Information Processing Society of Japan Institute of Systems Control and Information Engineers Society for Neuroscience Japan Neuroscience Society

We discuss ensemble learning using K simple non-linear perceptrons and a sign output function within the framework of statistical mechanics of on-line learning. One objective of statistical learning theory is to calculate the theoretical generalization error of a learner. In this paper we show that the generalization error of K students when their combined output is determined by a majority vote can be calculated as a function of two macroscopic variables: the degree of similarity between the teacher and the students, and the degree of similarity among the students. We then derive differential equations describing the dynamics of these macroscopic variables for a generalized learning rule. In addition, we derive these differential equations explicitly for three learning rules: the well-known Hebbian learning, Perceptron learning, and AdaTron learning rules. Solving these, we calculate the generalization error for each in turn numerically. As a result we find that these three learning rules have different characteristics with respect to their affinity to ensemble learning as seen in their conservation of diversity among students;and the fascinating fact that from this perspective the AdaTron learning rule is superior is brought to light. © 2005 Wiley Periodicals, Inc.

关键词： Learning systems

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Analytical approach for calculating the minimally required ranging codes in fixed and mobile broadband wireless access systems based on OFDMA

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WSEAS Transactions on Communications 2005年第10期4卷 989-993页

作者： Chang, Yong Hwang, Gang Uk Lee, Yutae Telecommunication Systems Division Information and Communication Business Samsung Electronics Co. Ltd. Suwon-si Gyeonggi-do Korea Republic of Division of Applied Mathematics and Telecommunication Engineering Program Korea Advanced Institute of Science and Technology Taejeon Korea Republic of Department of Information and Communication Engineering Dongeui University Busanjin-gu Busan 614-714 Korea Republic of

In this paper, we consider a ranging procedure occurred in the fixed and mobile broadband wireless access systems based on the Wireless MAN-OFDMA (Metropolitan Area Network -Orthogonal Frequency division Multiple Access). A ranging procedure is a collection of processes for a Mobile Subscriber Station (MSS) and a Base Station (BS) to maintain the quality of the radio frequency communication link between them. When multiple subscribers select the same ranging codes from the given ranging code pool and range the BS by transmitting those identical ranging codes at the same time frame, the ranging collision may be occurred at BS because the BS can not differentiate two different MSSs since they selected the same ranging code. We propose a mathematical performance model to analyze the probability of ranging collision affected by both the capacity of the ranging code pool and the rate of the MSS arriving to the system and investigate the numerical results of the proposed model. By the proposed model and its numerical results, we can calculate the minimum number of the required ranging codes to be implemented in BS(Base Station). We compare the analytical results with the simulated results to validate the proposed mathematical model is correct.

关键词： Wireless telecommunication systems

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Forming Limit Stresses of Sheet Metal under Proportional and Combined Loadings

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AIP Conference Proceedings 2005年第1期778卷 478-483页

作者： Kengo Yoshida Toshihiko Kuwabara Mitsutoshi Kuroda *Division of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2‐24‐16 Naka‐cho Koganei‐shi Tokyo 184‐8588 Japan †Institute of Symbiotic Science and Technology Division of Advanced Materials Science and Technology Tokyo University of Agriculture and Technology 2‐24‐16 Nakacho Koganei‐shi Tokyo 184‐8588 Japan ¶Department of Mechanical Systems Engineering Yamagata University Yonezawa Yamagata 992‐8510 Japan

The effects of changing strain paths on forming limit stresses of sheet metals are investigated using the Marciniak‐Kuczyński model. Forming limits are analyzed for proportional loading and two types of combined loadings: combined loading which includes unloading between the first and second loadings and that which includes an abrupt strain path change without unloading between the first and second loadings. The forming limit stress curves in stress space calculated for the combined loading with unloading are in good agreement with those calculated for the proportional loading, while the forming limit curves in strain space are strongly dependent on the strain paths. The forming limit stresses calculated for combined loading with an abrupt strain path change, however, do not coincide with those calculated for proportional loading. The strain path dependence of the forming limit stresses is discussed in detail.

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Multiobjective antenna array design using the method of genetic algorithms

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WSEAS Transactions on Communications 2005年第8期4卷 739-743页

作者： Mitilineos, Stelios A. Heretakis, Ioannis I. Chatziathanassiou, Nickolas Thomopoulos, Stelios C.A. Capsalis, Christos N. National Technical University of Athens Department of Electrical and Computer Engineering Division of Information Transmission Systems and Material Technology 9 Iroon Polytechneiou str. Athens 157 73 Greece National Center Science Research Demokritos Institute of Informatics and Telecommunications Patriarxou Ioakeim/Neapoleos str. Agia Paraskevi Athens 153 10 Greece

A multiobjective stochastic optimization technique is presented for the design of antenna arrays with given radiation pattern specifications. The technique utilizes the method of genetic algorithms and the proper objective functions are selected for the optimized array design. The technique has been implemented for the case where the arrays consist of vertical dipoles. The parameters of the GA include the elements positions, the array voltage excitation coefficients (amplitude and phase) and the radius and length of the dipoles. The array elements can either be arbitrarily placed, forming a non-uniform configuration or they can arange a circular, uniform, dual band array. In the latter case, the array and dipole characteristics are optimized by the GA for dual band operation, while different current coefficients have to be evaluated for each frequency. The presented results demonstrate the effectiveness, the versatility and applicability of the proposed technique.

关键词： Antenna arrays

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Tsunami monitoring system by stratospheric LTA platform

Tsunami monitoring system by stratospheric LTA platform

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AIAA 5th Aviation technology, Integration, and Operations Conference, ATIO and the AIAA 16th Lighter-than-Air systems technology Conference and Balloon systems Conference

作者： Koyama, Noboru Onda, Masahiko Sasaki, Yasunori Miura, Ryu Akinaga, Wakoto International Meteorological and Oceanographic Consultant Co. Ltd. Tokyo Japan National Institute of Advanced Industrial Science and Technology Tsukuba Ibaragi Japan National Defense Academy Yokosuka Kanagawa Japan National Institute of Information and Communications Technology Yokosuka Kanagawa Japan NEC Toshiba Space Systems Co. Ltd. Tokyo Japan Engineering Division Intelligent Systems Research Institute AIAA Department of Earth and Ocean Sciences Wireless Innovation System Group Sales and Marketing Division

ISBN: (纸本)1563477408

Tsunamis break out due to an oceanic earthquake or landslide and are propagated to far distant coasts at a very high speed resulting in serious damages to the coastal populations. This paper proposes a full-fledged advanced tsunami monitoring system which detects outbreaks of tsunamis and immediately disseminates alarm signals directly to the coastal populations from stationary LTA (Lighter-Than-Air) platforms positioned in the stratosphere over undersea epicenter areas. These platforms could also be used for other missions such as local weather observation, naval traffic monitoring etc., thus could be operated more economically than conventional tsunami monitoring and warning systems. Copyright © 2005 by the American institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Tsunamis

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Cellular anisotropy in mechanical properties of polyurethane foam

Cellular anisotropy in mechanical properties of polyurethane...

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Society of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005

作者： Goto, Akihiko Yamaguchl, Kazjjani Ishiaku, Umaru S. Hamada, Hiroyuki Department of Information Systems Engineering Osaka Sangyo University 3-1-1 Nakagaito Daito Osaka 574-8530 Japan Industrial Technology Center of Wakayama Prefecture 60 Ogura Wakayama 649-6261 Japan Division of Advanced Fibro Science Graduate School Kyoto Institute of Technology Sakyo-ku Kyoto 606-8585 Japan

We suggested that the cell shape in the polyurethane foam could be approximated to be the simple oval. We have investigated the relationship between the mechanical properties and the cell structure of the polyurethane foam. Deformation of cell structure was observed under the tensile load. Cellular anisotropy of the polyurethane was examined.

关键词： Foams

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