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Takahiko Kurahashi,Hideki Oshita 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.1
We present the shape determination method of 3-D reinforcement corrosion based on observed temperature on concrete surface. The non-destructive testing for reinforcement corrosion in concrete using a heat image on concrete surface have been proposed by Oshita. The position of the reinforcement of corrosion or the cavity can be found using that method. However, the size of those defects can not be precisely measured based on the heat image. We therefore proposed the numerical determination system of the shape for the reinforcement corrosion using the observed temperature on the concrete surface. The adjoint variable method is introduced to formulate the shape determination problem, and the finite element method is employed to simulate the heat transfer problem. Some numerical experiments and the examination for the number of the observation points are shown in this paper.
Range inclusion of two same type concrete operators
Takahiko Nakazi 대한수학회 2016 대한수학회보 Vol.53 No.6
Let $H$ and $K$ be two Hilbert spaces, and let $A$ and $B$ be two bounded linear operators from $H$ to $K$. We are interested in Range$B^\ast \supseteq$ Range$A^\ast $. It is well known that this is equivalent to the inequality $A^\ast A\geq\varepsilon B^\ast B$ for a positive constant $\varepsilon$. We study conditions in terms of symbols when $A$ and $B$ are singular integral operators, Hankel operators or Toeplitz operators, etc.
The Yomiuri Project and Its Results
Takahiko Tennichi 경남대학교 극동문제연구소 2007 ASIAN PERSPECTIVE Vol.31 No.1
In 2006 the Yomiuri Shimbun, the largest daily paper in Japan, completed a year-long campaign to clarify Japanese leaders' responsibility for World War II. Such an undertaking is rare in Japan. The campaign raised five questions: Why did Japan extend the lines of battle? Why did Japan go to war with the United States in spite of the extremely slim prospects for victory? What foolishness caused the Japanese military to employ suicide aircraft attacks? Were sufficient efforts made to bring the war to an end? And, what problems were there with the International Military Tribunal for the Far East? Our project team suggested answers to these questions and clarified who should be held responsible for the war. Throughout the project, we criticized Japan’s brutal militarism. At the same time, we made clear our view that those leaders who initiated the war betrayed Japan’s national interest. I believe that this project will be a cornerstone for future honest dialogue between Japan and its neighbors.
Voltage Regulator using Low Temperature Poly Silicon Technology for TFT-LCD Panel
Takahiko Mizuno,Masahiro Yoshida,Shigeki Imai,Yasoji Suzuki,Shinichi Murata 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, a voltage regulator which can be integrated on a LCD panel using LTPS-TFT is proposed. The new voltage regulator can be reduced the deviation rate of the reference voltage (α') depending on the load fluctuation because the new voltage regulator provides a reference voltage shifter (RVS). By utilizing this circuit configulation, the proposed regulator can be obtained a stable constant output voltage. To confirm some performances of the proposed voltage regulator, the circuit analysis is carried out by using Smart-SPICE. As this results, the regulation rate of the output voltage (α) of the proposed voltage regulator is improved about 50% in comparison with that of conventional circuit under the conditions that the supply voltage (VDD) is +15V, the frequency (f) with the load current of+0.5㎃±0.5㎃ is 250㎑.
Takahiko Mori 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Recently,study on a control of flexible manipulators have been receiving increasing attension in the domain of master-slave system. The master-slave system is a control system to operate a manipulator for objects in a remote environment which is at a distance from the presence of a human operator. In order to consider the influence by the elasticity of flexible manipulators, it is necessary to study on the control of vibration of flexible master-slave manipulators and the passivity. Thus in this paper, we discuss about a new modified bilateral controller considering the elasticity by using intervention impedance in basis on the passivity and a control performance of the system. This paper is organized in the following way : First, we introduce mechanical models of manipulators. Second, we propose bilateral controls by using intervention impedance based on passivity. Third, we transeform each models represented by time domain into models represented by s-plain, find the scattering matrix,and prove the passivity of system. Fourth, we propose a new modified controller controller for the purpose of realizaion. Lastly, we show some results of experiments in order to verify the usefulness of proposed controller.