M. Itami

Tokyo University of Science

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Kiminori Itoh

Yokohama National University

Masahiro Fujii

Niigata University

Masahiro Fujii

Utsunomiya University

Kiyoshi Mizuuchi

Osaka Research Institute of Industrial Science and Technology

Masami Sugioka

Osaka Research Institute of Industrial Science and Technology

Masakazu Kawahara

ShinEtsu Chemical (Japan)

Yohei Kawamagari

Tokyo University of Science

Kazuhiko Ohno

Mie University

Hiroto Ohta

Doshisha University

K. Inoue

New York University

Cooperative Institutions

Tokyo University of Science

The University of Tokyo

Osaka University

National Institute of Advanced Industrial Science and Technology

Nagoya University

Hokkaido University

Osaka Research Institute of Industrial Science and Technology

Kyoto University

Keio University

National Institute of Information and Communications Technology

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Processing of TiNi SMA fiber reinforced AZ31 Mg alloy matrix composite by pulsed current hot pressing

Materials Science and Engineering A (2004)

Kiyoshi Mizuuchi K. Inoue Kenichi Hamada Masami Sugioka M. Itami

Hot pressing

10.1016/j.msea.2003.10.286

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Citations (93)

A Study on Teletraffic Congestion Control of Inter-Vehicle Communication using Packet Priority

IEEE Intelligent Vehicles Symposium (2006)

Fumio Watanabe Yohei Kawamagari Masahiro Fujii M. Itami Kiminori Itoh

In IVC (inter-vehicle communication) systems, under the situation where communication traffic goes into crowded owing to increase in density of vehicles and IVC traffic, required communication traffic may exceed communication resources. This situation leads to unstable communication. In the communication assumed in IVC systems, both the high priority communication which demands urgent transmission such as incident and rapid braking information and the low priority communication which does not demand urgent transmission comparatively such as mid-level message and entertainment information exist together. In fact, the communication system that treats multi-level priorities is assumed. If these communication models are assumed, the situation where information with high priority is buried in information with low priority is fatal problem. As the result, improvement of safety, which is the most important purpose of IVC systems, may be harmed. Therefore, in this paper, the method that the throughput of information with high priority which requires urgent transmission is not sacrificed even if the load of teletraffic increases is proposed and its performance is evaluated

Priority ceiling protocol

Information transmission

10.1109/ivs.2006.1689618

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Citations (0)

Bi-directional OFDM Transmission using Adaptive Modulation that spreads Data Symbols

Hiroki Ishikawa Masahiro Fujii M. Itami Kiminori Itoh

An adaptive modulation in OFDM transmission is an effective scheme in order to increase transmission rate. In performing adaptive modulation, the transmitter must transmit allocation information of modulation scheme as packet header in order for receiver to demodulate symbols exactly. When different modulation scheme is allocated to each sub-carrier according to its channel state, transmission of huge allocation information of modulation scheme is required. This leads to degradation of transmission performance. Therefore, we propose an adaptive modulation scheme in OFDM that makes less allocation information transmission. In this paper, the proposed scheme is applied to bi-directional communication and detailed performance is analyzed

Header

Link adaptation

Modulation (music)

Channel state information

10.1109/isplc.2006.247461

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Citations (4)

A study on complexity reduction of zero-forcing ICI cannceller in mobile reception of OFDM

Akira Nakamura K. Ishizu Kazuhiko Ohno M. Itami

In mobile reception of OFDM, the bit error rate characteristic is deteriorated, because the inter-carrier interference(ICI) is generated by the Doppler-spread of radio channel. The influence of ICI can be reduced by ICI canceller based on Zero-forcing equalization. In this paper, Zero-forcing ICI canceller using the linear interpolation is studied in order to reduce the complexity of the circuits. As the result of simulation, the proposed ICI canceller can achieve performance equivalent to the conventional scheme with less complexity.

Interpolation

10.1109/icce.2010.5418836

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Citations (2)

Hardware implementation of FM multipath distortion canceller

M. Itami Toshiaki Mochizuki M. Hatori

The tap selecting digital adaptive FM multipath distortion canceller is described. In order to implement hardware of FM multipath distortion canceller, the convergence property of it is examined by computer simulation with finite bit length variables. As the result, a good DU ratio and fast convergence speed is confirmed. Moreover, simplification of hardware and structure of it is examined in practice.

Distortion (music)

10.1109/icassp.1986.1168729

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Citations (1)

A study of inter vehicle communication scheme allocating PN codes to the location on the road

Hiroya Nakata Takashi Inoue M. Itami Kiminori Itoh

In this paper, improving performance of the PN code allocation scheme for inter-vehicle communication system using spread spectrum communication that we have already proposed [Y. Shiga et al., Nov 2000] is discussed. In the proposed system, a road is divided into small areas and different PN code is assigned to each area. All vehicles on the road share the unique PN code map and they decide on their own PN code used in IVC according to their position on the road by referring the PN code map. By binding PN code to the absolute location, each vehicle can determine its PN code easily and no complex PN code allocation protocol is necessary. In this paper, performance of the proposed system is discussed under more actual and practical situations than the conventional analyses. Here, each vehicle makes a communication randomly while each vehicle is making a communication at constant intervals. As a result of computer simulations, better performance of the proposed scheme were confirmed as compared to the conventional scheme.

Code (set theory)

Position (finance)

Pseudorandom noise

10.1109/itsc.2003.1252739

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Citations (27)

A study of OFDM system applying frequency diversity

Takeshi Seki M. Itami Hiroto Ohta Kiminori Itoh

An OFDM system is widely known as a modulation scheme, which can reduce the effect of frequency selective fading. However, under a large frequency selective fading environment, it is difficult to demodulate correctly even with appropriate equalization. In this paper, an OFDM system applying a frequency diversity scheme is proposed. In this system, the same symbols are transmitted on several sets of carriers, and at the receiver end, these symbols are combined so as to maximize the signal to noise ratio. As the experimental result, it is shown that as the fading level becomes larger, the proposed system provides a larger gain in the bit error rate characteristics than the conventional system.

Diversity scheme

Fading distribution

Modulation (music)

Time diversity

Diversity gain

10.1109/pimrc.2000.881645

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Citations (5)

<title>Processing and properties of TiNi shape memory fiber-reinforced 6061 aluminum matrix composite made by spark plasma sintering</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2000)

Kiyoshi Mizuuchi Kanryu Inoue Kenichi Hamada Masami Sugioka M. Itami

Aluminum alloy matrix composite reinforced by continuous TiNi shape memory allow (SMA) fiber was fabricated by Spark Plasma Sintering (SPS) process of A1 alloy powder with 20 vol. % of the TiNi SMA fiber, and its microstructure and mechanical properties were examined. The A1 alloy powder with the TiNi fiber was readily consolidated into composite at temperatures between 633K and 873K. The relative packing density of the composite fabricated increased with increasing sintering temperature. Reaction occurred at the boundary between A1 alloy matrix and TiNi fiber and the interfacial reaction is considered to consist of three intermetallic phases, Ni₃Ti (next to TiNI), Ni₂Ti and Al₃Ni (next to A1 matrix). The tensile yield stress of the composite deformed in tension at 373K was higher by about 40MPa than at 293K.

Spark Plasma Sintering

Relative density

10.1117/12.396419

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Citations (12)

An analysis of incident information transmission performance using MCS/CDMA scheme

Fumio Watanabe Masahiro Fujii M. Itami Kiminori Itoh

Incident information transmission using an IVC (inter-vehicle communication) system is one of the most important factors in ITS in order to increase safety and efficiency of road traffic. In IVC systems that use a spread spectrum communication (SS) scheme, when communication traffic goes into crowded conditions due to an increase of density of vehicles and IVC traffics, communication resources beyond the capacity of the system are sometimes required and this leads to unstable communication. Under this situation, the incident information that must be transmitted immediately is afraid to be jammed by excessive IVC traffics and relay transmission of the incident information may be intercepted. In this paper, an IVC system based on slotted MCS/CDMA scheme is proposed in order to avoid such a situation. The proposed system prepares an exclusive time slot for incident information in order to prioritize incident information from the general IVC packets that are less important than the incident information packets. As the result, it is considered that the possibility of interception of relay transmission can be decreased. Since the proposed system prepares an exclusive slot of incident information, there is a disadvantage where IVC throughput is reduced by an addition of an exclusive slot. In this paper, the performance of the proposed system is examined by computer simulation and optimization of parameters is discussed.

10.1109/ivs.2005.1505110

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Citations (16)

Improving Detection Performance of Pre-coded STBC OFDM by Re-generating Pre-coded Symbols

H Horii S. Tamura Masahiro Fujii M. Itami Kiminori Itoh

The pre-coded STBC transmission is an effective scheme in order to improve performance of OFDM under frequency selective fading channels. However, its performance degrades very severe frequency selective fading. In this paper, an iterative detection scheme of the pre-coded STBC OFDM scheme is proposed and good performance is confirmed by computer simulation.

Space–time block code

10.1109/icce.2006.1598444

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Citations (0)