Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

Division display 401 - 420 of about 1,493 ／ All the affair displays >>

Inter-vehicle visible light communication using visually non-lighting LED

K. Maeno, T. Yendo, M. P. Tehrani, T. Fujii, T. Yamazato, M. Tanimoto

2010 IEE of Japan, Tokai Section, Wakate Seminar. page： - 2010.8

Unique teaching practices presented at Nagoya Univeristy OCW

T. Yamazato

Japanese Society for Engineering Education 58th Annual Conference & Exposition Vol. 10-107 page： - 2010.8

RM-002 LED Traffic Light Detection Using a High-speed-camera for a Road-to-vehicle Visible Light Communication System Reviewed

Premachandra Halpage Chinthaka Nuwandika, Yendo Tomohiro, Tehrani Mehrdad Panahpour, Yamazato Takaya, Okada Hiraku, Fujii Toshiaki, Tanimoto Masayuki

情報科学技術フォーラム講演論文集 Vol. 9 ( 4 ) page： 45 - 50 2010.8

Publishing type：Research paper (scientific journal) Publisher：FIT(電子情報通信学会・情報処理学会)運営委員会

A new visible light road-to-vehicle communication system at intersections is proposed for the area of ITS. In this system, the communication between a vehicle and an LED traffic light is conducted using an LED traffic light as a transmitter, and an on-vehicle high-speed camera as a receiver. The LEDs in the transmitter emit light in high frequency and those emitting LEDs are captured by the high-speed camera for making communication. Here, the luminance value of LEDs in the transmitter should be captured in consecutive frames to achieve communication. For this purpose, finding the transmitter and tracking it in consecutive frames by processing the images from the high-speed camera is important. We propose new effective algorithms for finding and tracking the transmitter, which result in a increased communication speed, compared to the previous methods. Experiments using appropriate images showed the effectiveness of the proposals.

RM-003 Channel Characteristics and Receiving System of Road-vehicle Communication Reviewed

MASUDA Takato, Yendo Tomohiro, YAMAZATO Takaya, OKADA Hiraku, TEHRANI Mehrdad Panahpour, FUJII Toshiaki, TANIMOTO Masayuki

Vol. 9 ( 4 ) page： 51 - 55 2010.8

10-107 Unique teaching practices presented at Nagoya Univeristy OCW Reviewed

Yamazato Takaya

Proceedings of Annual Conference of Japanese Society for Engineering Education Vol. 2010 ( 0 ) page： 210 - 211 2010.8

Experimental validation of TOA UWB positioning with two receivers using known indoor features Reviewed

Kietlinski-Zaleski J.

Record - IEEE PLANS, Position Location and Navigation Symposium page： 505 - 509 2010.8

Performance evaluation of the cognitive piggyback overlay systems using QAM modulation

J. Naganawa, K. Kobayashi, T. Yamazato, M. Katayama

Technical Report of IEICE Vol. SR2010-31 page： 89-94 2010.7

Improvement of the Sequential-Test-Based Cooperative Spectrum Sensing Systems in Band Limited Control Channels

S. Mitsuya, K. Kobayashi, T. Yamazato, M. Katayama

Technical Report of IEICE Vol. SR2010-19 page： 19-24 2010.7

Language：Japanese

In a cooperative spectrum sensing system, many nodes perform spectrum sensing and report their decisions to one fusion center via control channels. This paper considers efficient use of the frequency band for the control channels. For this purpose, sequential-test is introduced for the local decision at each node. With this scheme, the transmission timing of the reports from nodes becomes at random and necessary maximum bandwidth for the control channels decreases. Numerical results show that this sequential-test-base-scheme not only decreases the number of simultaneous reports but also improves sensing reliability. For further improvement, this paper introduces a decision scheme at the fusion center based on probabilistic features of the reports from nodes.

Visible Light Communication Between LED Array and On-vehicle High Speed Camera Reviewed

H. C. N. Premachandra, T. Yendo, M. P. Tehrani, T. Yamazato, H. Okada, T. Fujii, M. Tanimoto

Technical Report of IEICE Vol. ITS2010-10 page： 25-30 2010.7

Performance evaluation of the cognitive piggyback overlay systems using QAM modulation Reviewed

NAGANAWA Jun, KOBAYASHI Kentaro, YAMAZATO Takaya, KATAYAMA Masaaki

IEICE technical report Vol. 110 ( 153 ) page： 89 - 94 2010.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

This manuscript considers a secondary system sharing the spectrum with the primary system at the same time and frequency. The proposed cognitive overlay system relays the primary signal and piggybacks its own data on it. As the modulation scheme, phase shift keying and quadrature amplitude modulation are considered and performance with them are compared. The result of the analysis for Rayleigh fading environment shows that the proposed scheme with regenerative relay allows the secondary signal to communicate at the same speed of the primary signal without any harm to it.

Improvement of the Sequential-Test-Based Cooperative Spectrum Sensing Systems in Band Limited Control Channels Reviewed

MITSUYA Shohei, KOBAYASHI Kentaro, YAMAZATO Takaya, KATAYAMA Masaaki

IEICE technical report Vol. 110 ( 153 ) page： 19 - 24 2010.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Visible Light Communication Between LED Array and On-vehicle High-speed Camera Reviewed

Premachandra H. Chinthaka N., Yendo Tomohiro, Panahpour Tehrani Mehrdad, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, TANIMOTO Masayuki, Tanimoto Masayuki

電子情報通信学会技術研究報告. ITS Vol. 110 ( 150 ) page： 25 - 30 2010.7

Publishing type：Research paper (scientific journal) Publisher：一般社団法人電子情報通信学会

We propose visible light road-to-vehicle communication system at intersections for ITS. In this system, the communication between a vehicle and an LED array is conducted using an LED array as a transmitter, and an on-vehicle high-speed camera as a receiver. The LEDs in the transmitter emit light in high frequency and those emitting LEDs are captured by the high-speed camera for making communication. Here, the data is sent by emitting LEDs in the transmitter and those data is received by capturing luminance value of LEDs by high-speed camera. To achieve this, finding the transmitter and tracking it in consecutive frames is important. We propose new effective algorithms for finding and tracking the transmitter, which result in a increased communication speed, compared to the previous methods.

Effect of Slanted LED Traffic Light on Road-to-Vehicle Visible Light Communication Reviewed

SHIRAKI Yasutake, YAMAZATO Takaya, YENDO Tomohiro, FUJII Toshiaki, OKADA Hiraku, ARAI Shintaro

IEICE technical report Vol. 110 ( 150 ) page： 31 - 36 2010.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In this paper, we discuss on road-to-vehicle visible light communications using an LED traffic light and a high-speed camera fixed to a vehicle. We assume that the camera is facing forwards and that it is parallel to the surface of the road. In our study, the LED traffic light in the image is slanted to represent the case in which the camera and the LED traffic light are not directly facing each other in an intersection. In order to demodulate data, we consider the slanting of the LED traffic light on the image. In this paper, we evaluate the effect the slanting of the LED traffic light on communication.

Study on parallel visible light communication using visually non-lighting LED Reviewed

MAENO Keita, YENDO Tomohiro, PANAHPOUR TEHRANI Mehrdad, FUJII Toshiaki, YAMAZATO Takaya, OKADA Hiraku, TANIMOTO Masayuki

IEICE technical report Vol. 110 ( 150 ) page： 19 - 24 2010.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Previous studies on visible light communication uses visually lighting LED. However, LEDs isn't always lighting. In this paper, we propose visible light communication method using visually non-lighting LED. This method enables us to communicate using visually non-lighting tail lamps of cars and visually non-lighting traffic lights and so on. We conduct two types of experiments to demonstrate the performance of the proposed system. The result shows possibility of communication using visually non-lighting LED.

Spectrum Efficiency Improvement by Dynamic Resource Allocation for Satellite Terrestrial Integrated Mobile Communication System Reviewed

AMAN Tomohiro, YAMAZATO Takaya

IEICE technical report Vol. 110 ( 136 ) page： 97 - 102 2010.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In Satellite Terrestrial Integrated Mobile Communication System, a single mobile terminal can communicate to both satellite and terrestrial communication systems depend upon his location, QoS and availability of resources among satellite and terrestrial communication systems. But it is hard to achieve high spectrum efficiency of Satellite Terrestrial Integrated Mobile Communication System using fixed resource allocation schemes because variation of satellite traffic and terrestrial traffic is different. In this paper, we propose dynamic resource allocation schemes according to traffic of satellite communication systems and terrestrial communication systems. Finally we show spectrum efficiency is improved by proposed scheme.

Spectrum Efficiency Improvement by Dynamic Resource Allocation for Satellite Terrestrial Integrated Mobile Communication System

T. Aman, T. Yamazato

Technical Report of IEICE Vol. SAT2010-27 page： 97-102 2010.7

Language：Japanese

In Satellite Terrestrial Integrated Mobile Communication System, a single mobile terminal can com- municate to both satellite and terrestrial communication systems depend upon his location, QoS and availability of resources among satellite and terrestrial communication systems. But it is hard to achieve high spectrum efficiency of Satellite Terrestrial Integrated Mobile Communication System using fixed resource allocation schemes because variation of satellite traffic and terrestrial traffic is different. In this paper, we propose dynamic resource allocation schemes according to traffic of satellite communication systems and terrestrial communication systems. Finally we show spectrum efficiency is improved by proposed scheme.

Effect of Slanted LED Traffic Light on Road-to-Vehicle Visible Light Communication

Y. Shiraki, T. Yamazato, T. Yendo, T. Fujii, H. Okada, S. Arai

Technical Report of IEICE Vol. ITS2010-12 page： 31-36 2010.7

Language：Japanese

"In this paper, we discuss on road-to-vehicle visible light communications using an LED traffic light and a high-speed camera fixed to a vehicle. We assume that the camera is facing forwards and that it is parallel to the surface of the road.
In our study, the LED traffic light in the image is slanted to represent the case in which the camera and the LED traffic light are not directly facing each other in an intersection. In order to demodulate data, we consider the slanting of the LED traffic light on the image. In this paper, we evaluate the effect the slanting of the LED traffic light on communication."

Effects and Mitigation of Channel Errors in a Wireless Control System for Cooperative Motion of Machines Reviewed

KONDO Tsugunori, YAMAZATO Takaya, KATAYAMA Masaaki

IEICE technical report Vol. 110 ( 72 ) page： 57 - 62 2010.6

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

This manuscript discusses a wireless control system for cooperative motion of machines, and clarifies the influence of channel errors to a cooperative motion system. In addition, a new wireless control method is proposed to improve performance of cooperative motion when the channel errors occur. As an example of the controlled objects, rotary inverted pendulums with wireless connections in feedback loops are considered. In this study, we select a simple setting for cooperative motion, two rotary inverted pendulums are operated symmetrically. In order to improve the synchronization of their cooperative motion, we propose a system in which each pendulum receives control signals of it and also of the other pendulum. In addition, the main controller generates control signals for them based on the state information of both objects. The proposed system provides a better performance of cooperative motion than a conventional system with two independent feedback loops does.

Performance Evaluation of a Power Supply Overlaid Communication for Cooperative Motion of Multiple Machines Reviewed

MINAMIYAMA Fumikazu, KOGA Hidetsugu, YAMAZATO Takaya, KATAYAMA Masaaki

IEICE technical report Vol. 110 ( 72 ) page： 63 - 68 2010.6

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In order to reduce wiring in industrial machinery, we consider a cooperative-action system in which various devices (slaves) are multidrop-connected through a bus topology to a controlling master. Additionally, power is supplied together with communication signals over the same wiring. To accurately deliver timing information to the slaves, we propose the use of a spread spectrum (SS) signal. Together with the this signal, the control information signal is transmitted by applying an OFDM scheme. This manuscript provide an example of a set of system parameter to be used for an actual application. To assess the proposed method, the reception characteristics and mutual influence of the two overlaid signals is also explained.

High-speed-camera Image Processing Based LED Traffic Light Detection for Road-to-vehicle Visible Light Communication Reviewed

H.C.N. Premachandra, T. Yendo, M. P. Tehrani, T. Yamazato, H. Okada, T. Fujii, M. Tanimoto

IEEE Intelligent Vehicles Symposium page： 793-798 2010.6

Language：English

As one of ITS technique, a new visible light road to- vehicle communication system at intersections is proposed. In this system, the communication between a vehicle and an LED traffic light is conducted using an LED traffic light as a transmitter, and an on-vehicle high-speed camera as a receiver. The LEDs in the transmitter emit light in high frequency and those emitting LEDs are captured by the high-speed camera for making communication. Here, the luminance value of LEDs in the transmitter should be captured in consecutive frames to achieve effective communication. For this purpose, first the transmitter should be found, then it should be tracked in consecutive frames by processing the images from the high-speed camera. In this paper, we propose new effective algorithms for finding and tracking the transmitter, which result in a increased communication speed, compared to the previous methods. Experiments using appropriate images showed the effectiveness of the proposals.

　 PREV - NEXT 　

<YAMAZATO Takaya>

Papers - YAMAZATO Takaya