韓·中·日 初中高校生의 體格과 最大成長發育年齡에 관한 硏究 : 1987年을 中心으로

박춘배,최중명,박순영 慶熙大學校 1990 論文集 Vol.19 No.-

On the basis of the presented data which took boy and girl students and their subjects in Korea, Japan and Republic of China n 1987, the authors intended to compare and analyze the physique-growths(body height and body weight) of the three nations' students from May 1 in 1989 to April, 30, 1990 with the application of the medians of Korea, Republic of China and Japan. The result are as follows : A. Physical growth and development 1. Body height(cm) In case of male students, Korean students are superior in their body heights to Japanese students when they are before the year 10, but from 10 to 20, both of nations' students are same. And them students of Republic of China are all inferior to those of Korea and Japan through all these ages. In case of girl students, Koreans are taller than Japanese and Repulic of China through all these ages. Chinese are inferior in their heights to Korean and Japanese through all these ages. The interchange ages of the body height occured in the both sexes of 9.5-12.5 in Korean, 9.5-12.5 in Republic of China and 9.0-12.0 in Japan. During this period, girls are taller than boys, but after this period boys are taller than girls, Maximum growth age per year for male in Korea is the ages 12-13(8.71cm) and these for female is the ages 11-12(6.90cm) of Korean students. 2. Body weight(kg) In case of male, Japan students show similar growing degrees through all the ages, and the students of Korea and Republis of chinese indicate a little lower degree than Japan. In case of female, the similar phenomena are showed. The interchange ages of the body weight occured in the both sexes of 9.0-13.0 in Korea, 105-13.5 in Republic of China, and 10.0-12.5 in Japan. The MGA per year for male is the ages 12-13(7.01kg) in Korea, 13-14(5.46kg) in Republic of China, and 11-12(5.5kg) in Japan, while for female is the ages 11-12(2.72kg) in Korea, 10-11 and 11-12(4.39kg) in Republic of China, and 11-12(4.39kg) in Republic of China, and 11-12(5.1kg) in Japan, respectively. B : Maximum growth age(M.G.A) Comparison growth ages of Korean, Republic of China and Japanese students are as follows. Kore : Body height : Male 12.33 Female 11.32 Body weight : Male 12.36 Female 11.61 R.O.C : Body heigt : Male 13.27 Female 10.69 Body weight : Male 13.52 Female 11.50 Japan : Body height : Male 12.28 Female 9.88 Body weight : Male 11.94 Female 11.13

유한요소법을 이용한 기둥형 로드셀의 비선형성 평가

배준우,황재근,박경흠,양희준,이춘열 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.1

Recently, force measurement systems are commonly used in many industrial fields and the precision of the measurement system is getting more important as the industry needs more precise tools and instruments to make high quality products. However, a high precision force measurement system is hard to make unless we know precisely the causes, quality and quantity of measurement errors in advance. In this work, many possible mechanical causes of measurement errors are reviewed including ratio of length to diameter of sensing part, radius of contact area, radius of bearing part, ratio of material properties and change of boundary conditions. Also, the measurement errors are analyzed by nonlinear finite element method and the nonlinear behavior of the errors are investigated. The results can be used to design force measurement systems and expected to be very useful especially for compact type load cells.

BaTiO₃계 세라믹의 미세구조와 유전 특성에 관한 연구

박춘배,송민종 圓光大學校 1995 論文集 Vol.29 No.2

BaTiO₃계 세라믹은 페로브스카이트 구조, 높은 유전상수, 그리고 낮은 전이 온도에서 저항에 대한 낮은 온도계수를 갖는 물질이다. 이 세라믹은 소결에 의해 제조된 다결정체로서 내부 구조적으로는 결정립, 입계, 입계내에 존재하는 절연층 및 기공등으로 구성되어 있다. BaCO₃와 TiO₂를 적당한 몰 비율로 조성하여 소결온도의 변화에 따른 시편의 미세구조 변화와 주파수 변화에 따른 유전특성을 고찰하였다. 주파수 변화에 대한 복소 유전율 특성 곡선에서 쌍극자 분극이 나타났으며, 유전분산이 10[MHz]부근에서 크게 일어났다. BaTiO₃has the Perovskite Structure, high dielectric constant and a small temperature coefficient of resistance due to it's low transition temperature(T =120℃). This ceramic system was composed with insulation layer and pore within the grain and grain boundary. It was fabrication in palycrystalline at sintering temperature. BaCO₃and TiO₃was composied mol percent, was showed microstructure in variable sintering temperature and Elecronic, dielectric properties in variable frequency. Polarization in complex dieletric loss factor for the variable frequency was showed bipole polarization, dielectric dispersion is large increase above 10 mega frequency.

MIM 샌드위치 구조의 전도메카니즘에 관한 연구

배선기,박창엽,남춘우 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1

In this study, the MIM devices of Al-Al₂O₃-Al, Al-Al₂O₃-Ag structure with junction area ??[㎠] and thickness of oxide layer 30[Å] were fabricated, and then those conduction mechanism and characteristics were investigated. The results, at low voltage region the voltage-current characteristics was ohmic because of the quantum mechanical tunneling and hopping process, and at high voltage region the voltage-current characteristics was I∝V² because of the space charge limited conduction. The voltage which transited from ohmic to I∝ V² and the barrier height were 110[mV], 0.42[eV] of Al-Al₂O₃-Al device and 90[mV], 0.44[eV] of Al-Al₂O₃-Ag device respectively. The polarity dependence of voltage-current characteristics was found only in Al-Al₂O₃-Ag device because of the intrinsic field in insulator thin film.

A Study on Improvement of Electrical Stability in Semi-Conducting ZnO Ceramic Varistors Sintered in Oxygen Ambient

박춘배,소순진,김영진 원광대학교 2001 論文集 Vol.26 No.-

산소, 대기, 질소 아르곤 분위기에서 각각 서로 다른 4 종류의 시편이 소결되어졌다. 이들 4 종류에 대한 열화 특성을 연구하기 위해 115℃에서 가속 DC 열화시험이 이루어졌다. 미세구조 내에서 원소들의 분석을 위해 전자현미분석기(EPMA)가 이용되어졌다. DC 열화시험 이전의 전기적 특성의 모든 시편에 대해 거의 비슷한 특성을 보였으나, 열화시험 이후에는 각각의 시편에 대해 큰 차이를 보였다. 열화시험 이후에 4 종류의 시편들 중 산소분위기에서 소결된 ZnO 바리스터가 가장 우수한 특성을 보였으며, 이들 결정립에서 Zn 원소는 가장 많이 존재하고 O원소는 가장 적게 존재함을 밝혔다. Four different samples of ZnO ceramic varistors were sintered in oxygen, air, nitrogen and argon ambient, respectively. To investigate the degradation characteristics for these four samples, an accelerated DC degradation test was performed at 115℃ , Electron Probe Microanalysis (EPMA) was used to analyze the elemental content in microstructure, The samples have very similar electrical properties before the DC degradation test. After, however, each of the samples shows significant difference. It was found that ZnO varistors sintered in oxygen ambient show superior properties after the degradation test, the their gains have the highest Zn and the lowest 0 elements content among four samples. KEYWORDS : ZnO, varistor, degradation, EPMA, ambient sintering

農業用 水利設備를 理用한 小水力 發電의 資源調査 및 開發方法

朴椿培 圓光大學校 1987 論文集 Vol.21 No.2

본 연구에서는 전국적으로 산재되어 있는 농업용 수리설비를 조사하여 소수력 발전에 이용할 수 있는 후보지를 선정하였다. 한편 발전방식의 개량을 위하여 저낙차에서도 효율이 좋은 일체형 수차와 경제적이고 보수가 용이하여 기계적으로 튼튼한 유도 발전기를 선정된 후보지에 소수력 발전 시스템으로서 제안하였다. 또한 단독 전원으로 발전된 전력을 이용하는 응용기술분야를 제시하였다. In this paper, In order to select proposed site for the generation of mini hydro electric power, irrigation facillities of agriculture were investigated which were lying here and there. The water-mill of package type(which, is a high degree of efficiency at a low head of water) and the induction generator(which is stable and economical) were proposed as the generation system of mini-hydro electric power at a proposed site, in order to improve the generation system in the past. And applied fields of generated electric power were showed.

인버터勵磁 單相誘導發電機의 最大出力制御

朴椿培 圓光大學校 1986 論文集 Vol.20 No.2

본 연구는 소수력, 풍력, 파력등의 에너지 변환에 우수한 특징을 갖고 있는 인버터 단상 유도발전기를 어떠한 슬립에서도 최대출력을 얻을 수 있도록 하기 위하여 최대출력방정식을 유도하고, 피이드벡 제어 시스템을 구성하였다. 시작기의 실험 결과, 파형이 정현파에 근사하였으며 발전기도 안정하였다. 또한 DC 전원이 자동 충전되었고, 부하시에는 현저한 수하특성이 나타남을 알았다. 이리하여 항상 최대출력을 얻는 무인발전소의 가능성을 확고히 하였다. In any slip, In order to acquire maximum power from Inverter exciting single phase generator which has excellent characteristics in energy conversion of small hyraric power, wind power or wave power, maximum power wquation was induced and feedback control system was manufactured in this paper. Experiment for the system reveals the following facts, (1) Waveform from the generator is very similar to sine wave. (2) The system is very stable. (3) D·C Power is auto-charged. (4) There is severe droping characteristic on load. Thus, the posibility of unattended substation which generates maximum power at all times is become certain by this study.

전기-전자 기기의 과열방지용 박막형 서미스터의 PTC특성

송민종,박춘배 圓光大學校 1996 論文集 Vol.31 No.2

??을 기본 조성식으로하여 1,200[℃]에서 제조된 타게트는 1,350[℃]까지 소결 온도를 변화시켜서 BaTiO₃계 벌크형 세라믹 타게트를 제조하였다. 슬라이드 글라스, ITO(indum-thin-oxide) 글라스, 실리콘 웨이퍼, 백금판, 알루미나 세라믹 등 기판 종류를 변화시켜 295[℃]의 기판 온도에서 RF 스퍼터를 이용하여 서미스터 박막을 제조하였다. 시편의 비저항은 상온에서 ?? 정도의 반도성을 보였으며, 임계 온도 이상에서는 ?? 정도의 절연성을 보였다. 또한, 동일한 조건에서 기판의 종류에 따라 600[℃]에서 열처리한 시편의 저항 변화율은 각 기판에 따라 다르게 나타남을 알 수 있었는데, 이는 BaTiO₃계 박막 재료의 열 팽창 계수와 그에 따른 박막 두께의 변화 및 계면 현상의 차이라고 사료된다. BaTiO₃system bulk-type ceramic targets were fabricated at 1200[℃] by varying calcination temperature up to 1350[℃] based on the basic composite formula of ??. Thin films were formed on a slide glass, ITO glass, silicon wafer, platinum plate, alumina ceramics and etc, at 295[℃] by using RF sputter. Then second heat-treatment temperature was varied in the range of 400 to 1350[℃]. Measured resistivities of specimens at room and ciritical temperatures are about ?? (highly semicondutive) and ?? (insulating), respectively. Besides, it is thought that the proper composite formula could be obtained by considering the composition ratio of target based on the composite components of sputtered specimen. The resistivity variation of the thermally annealed specimen above 600[℃] depends severely on the substrate type. The variation may be due to a variation of film thickness and a difference of interfacial phenomena.

自勵型 Brushless 單相同期發電機의 解析

尹良雄,金永炯,朴椿培 圓光大學校 1982 論文集 Vol.16 No.2

The theoretical analysis of the cylindrical magnetic fieldtyped self-excited brushless single-phase synchronous generator with inductive load was performed in this paper. The equations for the generator with inductive load was derived in considering of non-linearity character owing to the saturation of magnetic path, and the data for the design of generator was derived in this paper too. The following facts are concluded; 1) The generator characteristics with inductive load is depend upon saturation curve and the capacity of condenser. 2) The generator characteristics with inductive load has compound character as it has the shunt character by condenser currenet and the series character by load current.

고속도강공구의 절삭온도 예측과 플랭크마모에 관한 연구

전태옥,전언찬,박흥식,배춘익 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool Flank wear were observed by the tool microscope. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.