전시-P-91 : Costs and Productivities of Forest Biomass Harvesting Operations in the US

( Han Sup Han1 ),( Sang Kyun Han ),( Du Song Cha ),( Nam Hun Kim ) 韓國木材工學會 2013 한국목재공학회 학술발표논문집 Vol.2013 No.-

전자척의 고정압력분포에 관한 실험적 연구

김청균,김한구,홍성준 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.1

This paper deals with the distributions of magnetic flux of an electro-magnetic chuck which is one of the most commonly used chucking attachments in a surface grinding machine. The measured results showed good correspondence with the theoretical results which were previously presented by the same author. The normal and tangential components of the magnetic flux density were measured using the gauss meter. The measured results indicated that the magnetic flux density was periodically changing over the transverse position to the magnetic pole. The normal component of magnetic flux decreases very rapidly for the increased z position.

일부 도시지역 여성의 건강과 가족생활 및 사회생활에 대한 조사

김학균,김정혜,김해연,배철영,신동학 대한가정의학회 1994 Korean Journal of Family Medicine Vol.15 No.6

진공차단기용 영구자석형 엑추에이터 최적설계

김한균,김중경,이정근,한성진 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1

The vacuum interrupter operated by permanent magnet actuator(PMA) gives outlook on improved characteristic, higher reliability and cost price reduction as well as the feature of simple structure and few component. For the anlysis and design of permanent magnetic actuator, not only electric, magnetic and mechanical phenomena but also material properties should be taken into account. Aim of the present paper is modeling of permanent magnet actuator(PMA) used in medium voltage distribution systems and remodeling by permanent magnetic. Coupled finite element method is used to analysis the modeling and we compared with previous PMA model and improved PMA model.

표면 거칠기가 탄성유체윤활에 미치는 영향에 관한 연구

김청균,김한구 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

In this study, lubrication characteristics of mechanical elements which is operated under the elastohydrodynamic lubrication condition has been analyzed numerically. According to the phase angle, wavelength, amplitude of surface roughness variation of two contact bodies, pressure distribution and film thickness have been analyzed by using finite difference method. Lubrication characteristics found the fact, when the dimensionless wave amplitude(α/hs) is 0.8, dimensionless wavelength of λ/b > 4 can produce negligible surface roughness effects. When the wave surface has shorter wavelength and/or larger amplitude, lubrication characteristics should be analyzed by considering the surface roughness effect.

이동탄성계에 의한 동하중과 축력을 받는 단순보의 동특성

김봉균,이용운,윤한익 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-

An analysis is presented on the influence of the axial force and a moving elastic system at constant velocities on dynamic behavior of a simple beam. The compressive force is consevative, which remain in constant direction. A moving elastic system consists of spring, viscous dampers, a sprung mass, and an unsprung mass. The sprung mass is an elastic body supported at both ends by the suspension unite consisting of springs and viscous dampers, and assumed to be vibrated transvesly. The unsprung masses are the rigid bodies attached to the bottom of the suspension unit and moves, not seperating from a simple beam, at constant velocity on it. As the position of a moving elastic system moves to the right on a simple beam, the deflection of it is increased. The deflection of a simple beam is nearly influenced by the velocities of a moving elastic body in total mode. Since the spring force control the transverse vibration of a simple beam, the large force of spring decrease the deflection unit and a axial force influence infitesimally on the deflection of a simple beam.

초고압 전력기기의 온도상승 예측

김중경,김한균,민경조,한성진 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1

This paper presents a new magneto-thermal finite element analysis for predicting the temperature rise of the EHV GIS bus bar. The power losses of a bus bar calculated by the magnetic field analysis are used as the input data to predict the temperature rise for the thermal analysis. The heat-transfer coefficients on the boundaries are analytically calculated by applying the Nusselt number considering material constant and model geometry for the natural convection. The temperature distribution in a bus bar by coupled magneto-thermal finite element analysis shows good agreement with the experimental data.

行政私法理論에 관한 考察

韓堅愚,金鉉峻 慶北大學校 1991 論文集 Vol.51 No.-

오리 網膜에 存在하는 神經節細胞의 數와 分布에 關한 硏究

姜翰秀,金武剛,申台均,金弘善,柳時潤,李永浩 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.1

The number and distribution of the retinal ganglion cells in the 1-week-old and 7-week-old ducks were determined from whole flat mounted preparations stained with methylene blue and thionin. The results were summarized as follows. 1. In the 1-week-old and 7-week-old ducks, the areas of the retinas were 269.4㎟ and 357.2㎟, respectively, and the total cell numbers 1,742,800 and 1,808,800, respectively. 2. The ganglion cells based upon soma diameter were classified into 3 groups such as small (below 10㎛), medium (10-20㎛) and large (above 20㎛) ganglion cells. In 1-week-old duck, the relative frequencies of these 3 groups were 91.0%, 8.5% and 0.5%, respectively, and in 7-week-old duck, 83.7% 14.7% and 1.6%, respectively. 3. Area centralis was located at the distance of 1.6mm (1-week-old) and 2.0mm(7-week-old) nasal side from the anterior tip of the pecten. The number of ganglion cells in the area centralis was 11,000 cells/㎟ (1-week-old) and 12,000 cells/㎟ (7-week-old). 4. There was a gradual decrease in density of retinal ganglion cells extending from area centralis to the periphery of retina. 5. The density of the large (above 20㎛) ganglion cells was higher in the peripheral regions than in the center of retina. Higher densities were noted in the superior-temporal region in 7-week-old duck, and in the nasal region in 1-week-old duck than in the other regions. 6. The direction of the beak tip is approximately 30° in 1-week-old and 26° in 7-week-old duck from the angle of the pecten.

인터넷을 통해서 본 미국 고등학교의 생물교육 내용 분석

윤한선,김종균,김현섭 공주대학교 사범대학 과학교육연구소 1999 과학교육연구 Vol.30 No.1

컴퓨터 통신과 인터넷에 힘입어 앞으로의 교육은 온라인 교육이 보편화될 것이다. 생물 교육에도 온라인 교육이 교육의 한 형태로 자리매김할 것으로 예상되므로 인터넷상의 학습 정보가 어느 정도인가를 파악하는 것은 매우 의미있는 일이라 생각된다. 따라서, 본 연구는 우리 나라보다 인터넷이 먼저 도입되고 또 많은 정보가 실려 있는 미국 고등학교 홈페이지의 생물 교과 내용을 조사 및 분석하여 우리 나라 고등학교의 생물 교과 온라인 교육 자료 제작에 참고할 수 있도록 함으로써 생물 교과의 수업에 조금이나마 도움을 주는 데 목적을 두고 수행되었다. 생물 교과 내용이 우수한 고등학교를 선정하기 위해서 미국에서 일반적으로 많이 적용하고 있는 4개의 홈페이지에 실린 19개 Topic을 기준으로 삼았다. 미국의 고등학교 홈페이지에 실린 내용이 그 기준에 어느 정도 접근하였는지를 조사하여, 접근률이 가장 큰 것에서부터 10개의 홈페이지를 선정, 그 내용을 분석하였다. 그 결과는 다음과 같다. 1. 미국 고등학교 훔페이지에는 학생들이 스스로 공부할 수 있는 생물 교과 내용이 충분히 있었고, 각 Topic에는 관련 사이트들이 많이 연결되어 있어서 각자의 능력에 맞는 내용을 선택하여 이용할 수 있게 되어 있었다. 2. 또한 전자우편을 통하여 질문과 답변뿐만 아니라 시험문항에 대한 답을 교환할 수도 있었다. 3. 표준으로 삼은 4개의 홈페이지와 상위 10개 홈페이지에 주로 소개되는 Topic은 Classical Genetics, The Cell, Biological Evolution, Chemistry of Life, Plants, Molecular Basis of Heredity, Energy, Diversity of Organisms, Behavior of Organisms, Cellular Respiration의 순서로 나타났는데, 이들 내용은 우리 나라 고등학교의 생물 교과 온라인 수업에 이용될 내용을 선정하는 데 참고로 삼을 만하였다. The continuous development of internet makes us not only use many types of information such as letters, pictures, sounds, animations and video-visions synthetically, but ?? communicate with each other. In a short time, we will make use of the computer with multimedia instead of the blackboard in education. And the on-line education will be world-wide by the help of telecommunication and internet. Naturally, it also will be applied to biology education. The purpose of this study is to analyze the homepages of the United States high school in order to help building up the data-base for high school biology curriculum of our country. For this study, we first investigated the references. Next, we classified and standardized the curriculums of the United States high school. After that, we searched for the high school home pages in the registered engine. Finally, we selected and analyzed the home pages close to the standard biology curriculum of them. The analyzed results were as follows. 1. The homepages of the United States high school were contained much biology related contents, and linked to various related topic sites including many animations to stimulate interest of students. It means that United States high school make good use of internet for the biology learning. 2. The homepags of the United States high school were also contained the teaching plan, the informations and questions for examination so that students may catch the way of learning. 3. It may be possible that students self-study using them. because the homepages were composed of the simple and systematic structure.