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Contribution to Green Power Technology Through Electrical Insulating Materials Research
Yoshimichi Ohki 한국전기전자재료학회 2010 Transactions on Electrical and Electronic Material Vol.11 No.4
With soaring public concerns of environmental issues, many researchers have started to carry out research on various related topics in many areas of science and engineering. This paper describes a brief outline of typical recent research results obtained in the author’s laboratory on electrical and optical properties of dielectric materials, done aiming at contributing to green power technology.
Segmentation Method for Phalanges in CR Image by Use of DCT
Yoshimichi Hozu,Seiichi Murakami,Hyoungseop Kim,Joo Kooi Tan,Seiji Ishikawa,Takatoshi Aoki 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, we propose a CAD (Computer aided diagnosis) system to analyze the RA (rheumatoid arthritis) and osteoporosis by using image processing techniques from the CR images. To analyze the RA, we develop a segmentation method for phalanges in CR Image by use of DCT (Discrete Cosine Transform) for detection of temporal change. The temporal change is detected using the difference image between previous image and current one. The DCT is performed to emphasize the edge of the difference image. Finally, the phalanges are extracted by performing Snakes. The primary objective of this study is to segment phalanges by making temporal subtraction images. We apply our proposed technique to eight cases of CR images and satisfactory segmentation results are achieved. A new index that diagnoses the progress level of the disease of phalanges can be offered as a second opinion.
Study on Effectiveness of Active Safety Devices on Low Friction Road Using Driving Simulator
Yoshimichi Terashima,Yuya Ishizaki,Ryuzo Hayashi,Pongsathorn Raksincharoensak,Masao Nagai 한국자동차공학회 2008 한국자동차공학회 Symposium Vol.2008 No.9
In recent years, various active safety devices have been developed for the prevention of accidents such as rear-end collision and skidding. The representative device for the collision prevention is the forward collision warning system, and the one for the stability control is the direct yaw-moment control (DYC) system using distributed braking forces. In this study, we aim to evaluate the performance of these devices by experiments using driving simulator reconducting critical and dangerous driving situations. Regarding the forward collision warning system, we propose a new algorithm of warning system adapted to road condition, and conduct experiments to verify its effectiveness with the driving simulator. The results of the experiment indicate that the proposed system is more effective than the conventional system. Regarding the DYC, we develop a DYC system for the driving simulator to verify the effectiveness of DYC on low friction road, including human driver in the closed-loop evaluation. The DYC algorithm is designed by model-matching control method. From the results of the experiment of obstacle avoidance, it reveals that the DYC system is very effective to stabilize the vehicle on low friction road.
Role of Gap Junctions in the Endothelium-Dependent Hyperpolarization of Vascular Smooth Muscle Cells
Yoshimichi Yamamoto,Megan F. Klemm,Hikaru Hashitani,Richard J. Lang,Tsuyoshi Soji.,Hikaru Suzuki 대한생리학회-대한약리학회 2001 The Korean Journal of Physiology & Pharmacology Vol.5 No.1
<P> Hyperpolarization of arterial smooth muscle by acetylcholine is considered to be produced by the release of an unidentified chemical substance, an endothelium-derived hyperpolarizing factor (EDHF). Several chemicals have been proposed as the candidate for EDHF. However, none of them fulfil completely the nature and property of EDHF. Ultrastructural observation with electron microscope reveals that in some arteries, gap junctions are formed between endothelial and smooth muscle cells. In small arterioles, injection of gap junction permeable dyes into an endothelial cell results in a distribution of the dye to surrounding cells including smooth muscle cells. These observations allow the speculation that myoendothelial gap junctions may have a functional significance. Simultaneous measurement of the electrical responses in both endothelial and smooth muscle cells using the double patch clamp method demonstrates that these two cell types are indeed electrically coupled, indicating that they behave as a functional syncytium. The EDHF-induced hyperpolarization is produced by an activation of Ca<SUP>2</SUP>-sensitive K<SUP></SUP>-channels that are inhibited by charybdotoxin and apamin. Agonists that release EDHF increase [Ca<SUP>2</SUP>]<SUB>i</SUB> in endothelial cells but not in smooth muscle cells. Inhibition of gap junctions with chemical agents abolishes the agonist- induced hyperpolarization in smooth muscle cells but not in endothelial cells. All these observations can be explained if EDHF is an electrotonic signal propagating from endothelium to smooth muscle cells through gap junctions.
요시미치사토 ( Yoshimichi Sato ) 연세대학교 사회발전연구소 2009 현대사회와 문화 Vol.28 No.-
구로사와(Kurasawa, 1986)가 만든 사회적 지도(social maps)는 도쿄에서의 공간, 사회계층, 범죄 사이의 흥미로운 관계를 보여주고 있다. 사회경제적 지위가 낮은 인구가 일본 동부에 집중되어 있지만, 범죄율은 이 지역에서 높게 나타나는 것이 아니라 도쿄 전반에서 불규칙적으로 나타난다. 일반적인 사회학적 지식에 따르면 사회경제적 지위와 범죄율은 서로 반대로 나타나야 하지만, 도쿄에서는 그렇지 않은 것이다. 이 수수께끼를 어떻게 풀 수 있을까? ‘사회적 자본’으로 이 문제를 풀 수 있다. 동부지역의 사회경제적 지위는 낮지만 많은 주민들이 자영업자이며 오랫동안 이 지역에 살아왔던 사람들이다. 따라서 높은 수준의 사회적 자본을 형성할 수 있었고, 이것이 범죄율의 상승을 막은 것으로 볼 수 있다. 이러한 결과는 공간과 사회계층이 진공 속에서가 아니라 사회역사적 맥락 속에서 같이 진화해 나간다는 것을 의미한다. Social maps created by Kurasawa (1986) reveal an intriguing relationship between space, social stratification, and crime in Tokyo. Although people with lower socioeconomic status concentrate in the eastern area, the crime rate is not necessarily high in the area; rather, it seems to be randomly distributed over Tokyo. Conventional sociological knowledge tells us that the crime rate negatively correlates with socioeconomic status, which is not the case in Tokyo. How can we explain this puzzle? Social capital is the key to solving it. Although they are in lower socioeconomic status, people in the eastern area are mainly self-employed and have lived in the same residence for many years. Thus they have established rich social capital, which has prevented the rise in the crime rate. This finding implies that space and social stratification co-evolve not in a vacuum but in the socio-historical context.
Contribution to Green Power Technology Through Electrical Insulating Materials Research
Ohki, Yoshimichi The Korean Institute of Electrical and Electronic 2010 Transactions on Electrical and Electronic Material Vol.11 No.4
With soaring public concerns of environmental issues, many researchers have started to carry out research on various related topics in many areas of science and engineering. This paper describes a brief outline of typical recent research results obtained in the author's laboratory on electrical and optical properties of dielectric materials, done aiming at contributing to green power technology.