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VTC Spring 2009 - IEEE 69th Vehicular technology Conference

作者： Lanante Jr., Leonardo Kurosaki, Masayuki Ochi, Hiroshi Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9781424425174

This paper proposes a simple algorithm for joint estimation of carrier frequency offset and I/Q imbalance. The reduced complexity algorithm is derived from a closed form solution of the carrier frequency offset and I/Q imbalance parameters given two identical training blocks. The proposed algorithm also uses the least squares algorithm to give accurate estimate in the presence of noise. It was shown that for as little as 10 samples each from two identical OFDM symbols, the proposed algorithm can produce accurate estimate of CFO and I/Q imbalance. While the target system is OFDM, the proposed algorithm applies to any system as long as two identical data blocks are received in the receiver. Simulation results show that performance of the proposed algorithm that uses only 10 samples for complexity reduction is only 1dB below a system without CFO nor I/Q imbalance degradation. © 2009 IEEE.

关键词： Orthogonal frequency division multiplexing

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A new joint estimation scheme for carrier frequency offset and I/Q imbalance

A new joint estimation scheme for carrier frequency offset a...

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2009 IEEE International Conference on Communications, ICC 2009

作者： Lanante Jr., Leonardo Kurosaki, Masayuki Ochi, Hiroshi Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9781424434350

This paper introduces a novel algorithm for jointly estimating Carrier Frequency Offset and I/Q Imbalance for OFDM systems. The new algorithm is a closed form solution to obtain the frequency offset and I/Q Imbalance parameters in the absence of noise. In the presence of noise, the proposed algorithm uses the least squares algorithm to accurately estimate the parameters. The proposed algorithm is thus very scalable in terms of complexity. While the target system is OFDM, the proposed algorithm applies to any system as long as two identical data blocks are received in the receiver. Simulation results show that given a suitable amount of CFO, the high estimation accuracy of the proposed algorithm makes its BER performance comparable to a system without CFO and I/Q Imbalance. ©2009 IEEE.

关键词： Orthogonal frequency division multiplexing

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Construction of super-micro sense of force feedback and visual for micro objects - Develop the haptic device

Construction of super-micro sense of force feedback and visu...

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作者： Uehara, Ryo Hayashi, Eiji Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan Department of Mechanical Information Science and Technology Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9784990288037

This research aims to develop a combined sense system that uses both the sense of a force feedback as well as visual feedback in the shape of microscopic features from a micro sample. It is thought that the efficiency of minute work would be improved if the operator could obtain a sense of force while using a manipulator. We used a cantilever to touch a minute object and obtained anti-power from the degree of its bend. We made a haptic device, which gives a sense of force to the operator, who can feel the force when he touches a sample with a cantilever. In addition, when he uses the haptic device in a simulated manner, he can feel as if he had touched a sample. ©ISAROB 2009.

关键词： Haptic interfaces

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Feature extraction from EEG signals in P300 spelling system

Feature extraction from EEG signals in P300 spelling system

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ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009

作者： Omori, Kana Yamaguchi, Tomonari Inoue, Katsuhiro Department of Systems Innovation and Informatics Graduate School of Computer Science and Technology Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Department of Systems Innovation and Informatics Faculty of Computer Science and Technology Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

ISBN: (纸本)9784907764333

Recently, there are many studies on brain computer interface (BCI) system and some use EEG response at oddball paradigms. The aim of this paper is to extract feature (i.e. P300 response) from the EEG signals to improve the spelling system. We propose the method to analyze the averaged EEG signal concerned time and spatial. It is confirmed that the processing period with feature extraction is able to be shortened by averaging multi-channels. Effective information is obtained from the EEG signal near of the center part. © 2009 SICE.

关键词： Brain computer interface

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Development of an autonomous-drive personal robot (self-position recognition by characteristic point detection)

Development of an autonomous-drive personal robot (self-posi...

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作者： Matsuura, Seiki Hayashi, Eiji Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka Prefecture Japan

ISBN: (纸本)9784990288037

We are attempting to develop an autonomous personal robot that has the ability to perform practical tasks in a human living environment by using information derived from sensors and a knowledge database. When a robot is made to function in a human environment, the issue of safety must be considered in regard to its autonomous movements. Thus, robots absolutely require systems that can recognize the external world and maintain correct driving control. We have thus developed a navigation system for an autonomous robot. The system requires only image data captured by an ocellus CCD camera. This study paid attention to the necessary self-position recognition so that the robot can move precisely. We limited the environment in which it drove to a corridor. In this system, the robot recognizes a door from an image provided by an ocellus CCD camera, and it calculates its position relative to the door. In addition, it recognizes its self-position by comparing the calculated result about the door to map information that we registered beforehand. From all of this and based on the understanding of its self-position that it has developed, the robot performs safe and correct movements without hitting walls. ©ISAROB 2009.

关键词： Robots

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Development of an autonomous-drive personal robot "object recognition system using a monocular camera"

Development of an autonomous-drive personal robot "object re...

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作者： Moritaka, Yuki Hayashi, Eiji Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka Prefecture Japan

ISBN: (纸本)9784990288037

We are developing an autonomous personal robot able to perform practical tasks in a human environment based on information derived from camera images and a knowledge database. In the robot's adjustment to a human environment, it is very important that it be able to recognize the external world and identify specific objects. If an object cannot be identified, the robot cannot determine its next action plan. For this reason, we have developed an object-recognition system that allows an autonomous robot to identify objects within its environment. This object-recognition system is composed of both shape- and color-recognition systems that are based on a sensor using only a monocular camera. The shape-recognition system discerns objects' domains from their background by using region splitting processing. In the shape-recognition system, an object is identified based on its distinctive shape. The color-recognition system identifies an object based on its color information. Here we explain the algorithm used for the object search and the method for processing images. In addition, we describe the results of an experiment carried out to evaluate the system as it performed an object search. ©ISAROB 2009.

关键词： Object recognition

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The recognition of multiple people using an ocellus camera

The recognition of multiple people using an ocellus camera

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作者： Tanaka, Seiichi Hayashi, Eiji Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka Prefecture Japan

ISBN: (纸本)9784990288037

Communication between a person and a robot is necessary for the robot to be able to function in a human living environment in such a way as to be helpful to the humans. A human being needs to send a command to a robot without having to use exclusive equipment, and this requires that the robot recognize the human being. For this purpose, I have developed in this study a system for recognizing multiple human beings whose images appear in a CCD camera. The purpose of this system is to enable a robot to recognize the position of a user with a stemma camera image. From this image, the system detects an object which moves, and it then carries out a search in its data domain. It pays attention to the shape and color of the object and narrows it down to either a non-human object or a human being. In addition, it determines the position of a human face and decides if it is a human being from the color, size, and position of the face that it detected. ©ISAROB 2009.

关键词： Robots

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Development of indoor navigation system for monocular-vision-based autonomous mobile robot

Development of indoor navigation system for monocular-vision...

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作者： Kinoshita, Tomoyuki Hayashi, Eiji Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka Prefecture Japan

ISBN: (纸本)9784990288037

In our research, we developed a technology for our robot that uses an indoor navigation system based on visual methods to provide the required autonomy. For robots to run autonomously, it is extremely important that they be able to recognize the surrounding environment and their current location. Because it was not necessary to use plural external world sensors, we built a navigation system in our test environment that reduced the burden of information processing mainly by using sight information from a monocular camera. In addition, we only used natural landmarks like walls because we assumed the environmental to be a human one. In this paper we discuss and explain two modules: a self-position recognition system and an obstacle recognition system. In both systems, recognition is based on image processing of the sight information provided by the robot's camera. In addition, to provide autonomy for the robot, we use an encoder and information from a two-dimensional space map given beforehand. We explain here the navigation system that integrates these two modules. We applied this system to the robot in an indoor environment and evaluated its performance, and in a discussion of our experimental results we consider the resulting problems. ©ISAROB 2009.

关键词： Navigation systems

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Volume phase transitions of smectic gels

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Physical Review E 2009年第5期79卷 051704-051704页

作者： Akihiko Matsuyama []Department of Bioscience and Bioinformatics Faculty of Computer Science and System Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka 820-8502 Japan

We present a mean-field theory to describe volume phase transitions of side-chain liquid crystalline (LC) gels, accompanied by isotropic-nematic-smectic-A phase transitions. Three different uniaxial nematic phases (N1, N2, and N3) and smectic-A phases (S1, S2, and S3) are defined by using orientational order parameter Sm of side-chain liquid crystals (mesogens), Sb of semiflexible backbone chains, and a translational order parameter σ for a smectic-A phase. We derive the free energy for smectic-A phases of side-chain LC gels dissolved in an isotropic solvent and examine the swelling curve of the LC gel, the orientational order parameters, and the deformation of the LC gel as a function of temperature. We find that the LC gel discontinuously changes the volume at an isotropic-nematic, an isotropic-smectic-A, and a nematic-smectic-A phase transition.

关键词： Chains

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Influence of nanoparticles on critical current properties in TFA-MOD processed YGdBCO coated conductor

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Journal of Physics: Conference Series 2010年第2期234卷

作者： Masaru Kiuchi Fumiya Matsutani Yuji Takahashi Edmund S Otabe Teruo Matsushita Masashi Miura Teruo Izumi Yuh Shiohara Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Superconductivity Research Laboratory International Superconductivity Technology Center 1-10-13 Shinonome Koto-ku Tokyo 135-0062 Japan

For investigation of the flux pinning properties of nanoparticles in TFA-MOD processed Y1−xGdxBa2Cu3Oy (YGdBCO) coated conductors, the critical current density was compared in various directions of the magnetic field for YGdBCO+BaZrO3 (BZO) and YGdBCO coated conductors with the superconducting layer of 0.5 μm thickness. It was found that Jc for θ = 0° (B//e) is larger but Jc for θ = 90° (B//ab) is smaller in YGdBCO+BZO than in YGdBCO. The increase in the normal field is attributed to the pinning of nanoparticles, while the decrease in the parallel field is considered to be caused by limitation of extension of stacking faults by distributed BZO nanoparticles. In addition, the n-value (E ∝ jn) decreases by introduction of BZO nanoparticles for θ = 90°, while it is unchanged for θ = 0°. These results are well described by a theoretical model of flux creep and flow.

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