[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

대장암 환자에서의 담즙 암태아성 항원(CEA)

김종우,박용태,정철운,권성원,장항석,손석우,안대호,이경포 대한대장항문학회 2000 Annals of Coloproctolgy Vol.16 No.6

낙농자조금 사업의 성과분석

박종수,권용대 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.1

This paper aims at examining the effectiveness of dairy check-off funds, which was first launched by initiative of dairy farmers in 1999 and spent for dairy promotion program such as milk advertising and consumption campaign, and then providing the guideline for efficient funds management. Based on the econometric simulation, we derived meaningful results that dairy promotion program directly contributed to increasing milk consumption by 5,613 m/t worth of 7,468 million won more than would have been otherwise. In addition, it was estimated that dairy promotion program, while alleviating penalty fee for lower quality of fresh milk and redeeming assistance for higher milk grade and supporting for milk price, would indirectly benefit dairy farmers 86,968 million won, which accounts for 52 won of profits per won. Such estimates show that first dairy promotion program was successfully implemented. However, for future program to take more merits, some directions should be suggested as followings; 1) continuing milk advertising campaign, 2) R&D for milk marketing, 3) consumer education and information.

몬드리앙(PIET MONDRIAN)의 作品 世界

朴鍾大 群山大學校 1984 論文集 Vol.7 No.-

Dutch painter who gained international recognition as a leader of the geometrical Abstract style. He was born at Amersfoort and studied at the Amsterdam Academy. His early painting was naturalistic and direct, often delicate in colour though greys and dark greens predominated. Between 1907 and 1910, partly under the influence of Toorop and perhaps partly owing to his conversion to theosophy, his painting took on a Symbolist character and he began to work with primary colours. In 1911 he went to Paris, where he came into contact with Cubism and executed the now famous series of successive abstractions on a single theme Trees. He was caught in Holland by the outbreak of the First World War and continued there his study of abstraction, developing theories about the horizontal-vertical axes. With Theo van Doesburg he founded the periodical De Stijl in 1917 and became the main exponent of a new kind of abstract painting which he named N대-Plasticism. His pictures were designed by horizontal and vertical lines marking rectangles of primary colours with black, white, and grey. In 1920 he published an exposition Le Neoplasticisme, a German translation of which was published by the Bauhaus in 1925. In 1939 Mondrian left Paris for London and from 1940 to his death lived in New York. There he did a gayer and more lively set of abstracts of which Broadway Boogie-woogie and the unfinished Victory Boogie-woogie are the best known. Mondrian's concept of 'pure plasticity' consisted partly in the simplification of the means of expression to the bare essentials. He not only banished representation and three-dimensional picture-space but also the curved line, sensuous qualities of texture and surface, and the sensuous appeal of colour. The basic elements were straight lines meeting at right angles and a limited number of primary colours. This restrictedness he regarded as a sort of mystical pursuit of a Absolute which he justified in terms of his theosophical beliefs. His extensive influence on the art and taste of the 1930s onwards was not limited to artists such as Ben Nicholson, Max Bill and others whose style had direct affinities with his own. He also had a profound influence on contemporary fashion in commerical and advertisement design.

밝은社會를 指向하는 指導者 Leadership에 關한 硏究 : 새마을 指導者를 중심으로 With Reference to the Saemaeul Leadership

朴淳永,申大淳,趙萬濟,金旭卿,金種垠 慶熙大學校 1980 論文集 Vol.10 No.-

The Saemaeul Undong was launched in 1972 on the basis of the experimental model or Saemaeul pilot projects of the previous year. The Saemaeul Undong is now a nation-wide movement which is based on the fundamental spirits of diligence, self-help and cooperation. Much of the success of the Saemaeul Undong depends on its leaders, who play a pivot role in implementing Saemaeul projects for their community. Popularly elected by the village assembly according to their leadership and faith, the leaders render their services without remuneration, working in the spirit of self-sacrifice. Now, the Saemacul Undong enters upon its tenth year in 1981. If the movement is to continue with renewed momentum, effective training projects for Saemaeul leaders must be worked out. For this purpose, it is then recommended that the research works on the leadership training projects of the Bright Society Movement be referred to. Initially started as a community movement for better life on the campus of Kyung Hee University in 1960's, the Bright Society Movement is now gaining widespread support from national as well as international club members. The goals of the Bright Society Movement are to promote mutual understanding and friendship among members and to construct on earth a truly sound and civilized welfare society that is spiritually beautiful, materially affluent, and humanely rewarding. The main objectives of this study is to propose effective training projects for Saemeaul leaders as well as the Bright Society leaders. 1) Educational courses of leadership training should be offered through the school as well as through the training institution of the community. 2) Educational contents of leadership training should place greater emphasis not only on the spiritual education but also on the technical and practical education related to the welfare of the Community. 3) Public relations education should be strengthened because leaders must work in close cooperation with the community residents for the effective movement. 4) Long-term integrated projects for the community or village unit should be established and the movement should be developed according to them. 5) A special system of regional itinerant education should be established for the effective management of selective leaders. 6) For the welfare of leaders themselves, special favors such as the authorization of leadership careers, scholarships for their sons and daughters, discounts on public charges and the priority on public employment must be offer according to their respective performance.

CO/CO_2혼합 gas를 이용한 산화텅스텐(WO_3) 환원-탄화 반응에 관한 연구

박영효,이종대,박노국,이태진 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1

The reduction-carburization of tungsten oxide(WO_3) with CO/CO_2 mixtures was studied. The reduction rate was increased with the concentration of CO. The final products at 1100℃ were WC(CO concentration: 90∼100 vol%), W (CO concentration: 85 vol%) and WO_2 (C0 concentration: 70 vol%). For the CO concentration of 100 vol%, the general reaction routes were WO_3 → W_20O_58 → W_18O_49 → WC (reaction temperature: ­600℃), WO_3 → W_20O_58 → W_18O_49 → WO_2 → WC (reaction temperature: 600∼800℃) and WO_3 → W_20O_58 → W_18O_49 → WO_2 → W → WC (reaction temperature: +900℃).

고강도 할로겐광으로 중합한 복합레진 수복재의 경도

박종석,이광희,김대업,김성형,안호영 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.3

복합레진의 광중합시간 단축과 관련하여 최근에 개발된 고강도 할로겐광 중합기를 기존의 중강도 할로겐광 중합기와 비교 평가하기 위하여. 세 종류의 광중합용 복합레진을 두께가 2, 3, 4, 5mm인 스테인레스 스틸 몰드에 충전하고, 레진 상면을 중강도 할로겐 광은 (1) 400mW/cm²으로 40초간, 고강도 할로겐광은 (2) 10초동안 100mW/cm²부터 1000mW/cm²까지 출력량이 증가하면서 중합하고 다음 10초동안 1000mW/cm²로 중합하는 ramp 모드로 20초간, (3) 1000mW/cm²의 boost 모드로 10초간. (4) 850mW/cm²의 표준 모드로 20초간 조사하고. 상면과 하면의 표면경도를 미세경도측정기로 측정한 후 실험군간의 차이를 분석하였다. 레진 상면의 경도는 중합광의 강도와 중합시간 및 레진 두께에 따른 차이가 없었다(유의수준 0.05, 이하 동일). 레진 하면의 경도는,두께 2mm의 중강도군(1)을 제외하고,상면의 경도보다 낮았다. 레진 하면의 경도는 두께 2mm에서 중강도군(1)이 ramp군(2) 및 boost군(3)보다 높았고 중강도군(1)과 표준군(4) 간 및 ramp군(2)과 boost 군(3)간에 차이가 없었으며 두께 3mm에서 중강도군(1)이 가장 높았고 표준군(4)이 boost군(3)보다높았다. 따라서, 복합 레진의 중합 깊이 측면에서 볼 때. 1000mW/cm²의 고강도 할로겐 광을 10초간 조사한 것은 400mW/cm²의 중강도 할로겐광을 40초간 조사한 것에 미치지 못하였으며, 레진 두께 2mm이내인 경우에는 850mw/cm²의 고강도 할로겐 광을 20초간 조사함으로써 400mw/cm²중강도 할로겐 광을 40초간 조사한 것과 대등한 중합을 일으킬 수 있었다. The purpose of this study was to compare the effect of the high intensity halogen light (850∼ 1000 mW/cm²) with that of the conventional halogen light (400 mW/cm²) on the hardness of composite resin. Three resin com-posites (Z-100, 3M, U.S.A ; Tetric Ceram, Vivadent, Liechtenstein : Surefil, Dentsply, U.S.A.) were filled in the stainless steel moulds which were 4mm in diameter and 2, 3, 4, and 5 mm in depth, respectively. They were cured under the four different modes : (1) conventional mode,40 seconds at 400 mW/cm²; (2)'ramp'mode, 10 seconds at 100 to 1000 mW/cm² plus 10 seconds at 1000 mW/cm²: (3)'boost'mode, 10 seconds at 1000 mW/cm²: and (4) 'standard'mode, 20 seconds at 850 mW/cm² The surface hardnesses of the top and the bot-tom of the resin samples Were measured with a microhardness tester (MXT70, Matsuzawa, Japan) . The top surface hardness was not significantly different among the curing modes . The bottom surface hardness was gen-erally the highest in the conventional mode and the lowest in the high intensity boost mode There was no sig-nificant difference in the bottom surface hardness between the conventional mode and the high intensity standard mode in 2mm depth. The results suggest that the curing time of the high intensity halogen light (850 mW/cm²) should be at least 20 seconds to produce the equal level of the bottom surface hardness of 2mm resin composite as compared to the hardness produced by the conventional halogen light (400 mW/cm²).

무들에서 Stack 질문유형을 활용한

박종대 배재대학교 자연과학연구소 2014 自然科學論文集 Vol.25 No.1

무들 LMS에서 사용할 수 있는 Stack 문제 유형은 오픈소스 컴퓨터 대수 시스템인 Maxima를 이용하는 문제 유형으로 공학 교육에 필요한 미분, 적분, 테일러 급수, 라플라스 변환, 미분방정식, 선형 방정식, 다항식, 집합, 리스트, 벡터, 행렬, 텐서 등의 문제를 출제하는데 사용할 수 있다. 또한 퀴즈문제에 2차원 혹은 3차원 그래프도 포함 시킬 수 있다. Stack 문제 유형을 사용하면 rand() 함수를 사용하여 숫자나 함수가 임의로 바뀐 문제가 제시되도록 할 수 있으며, 여러 번 시도를 허용하면 완전학습을 가능하게 할 수 있다. 무들 Stack과 같은 컴퓨터 채점기반 수학 시스템을 사용하면 공학교육을 혁신적으로 발전시킬 수 있을 것10 Moodle stack questions can be used for authoring mathematical questions in the area of differential equations, integration, Taylor series, Laplace transform, linear equations, polynomials, sets, lists, vector, matrix, tensors. 2D Plots and 3D plots commands can also be embedded in the question sentences when plots are needed to be displayed. The rand() function can be used for the variables in the question sentences for random questions where numbers, variables, functions are randomly chosen by a computer system. This features can allow students to try quizzes many times with slightly different questions leading to mastery learning. It is expected that engineering education can be greatly improved using stack question type questions in Moodle.

족저압 측정에 의한 편마비 환자의 입각기의 분석

홍대종,박시복,이상건,이강목 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.5

점증적 최대부하 운동이 호흡순환계 및 젖산변화에 미치는 영향

박순진,윤종대,권창기,김귀성 용인대학교 무도연구소 2000 武道硏究所誌 Vol.11 No.1

This study was to investigate a cardiorespiratory response and the chang of blood lactate concentration between untrained men and judo fellows after maximal exercise. The result of this study was as follows: All of the variables(HR, VE, and VO2max) were non significant as well as RER in a cardiorespiratory response. In addition, both between groups and interaction were non significant the change of a blood lactate concentration. However, not only VO2 was sigpificant(p<.05) in the comparison of between groups in a cardiorespiratory response but the chang blood lactate concentration was significant(p<.01) in measuring time. As a result of this study, the study of a cardiorespiratory variables and the reduction of blood lactate concentration related to recovery on fourties subjects after maximal exercise didn't get particular result but it is showed the condition of health of middle aged men indirectly as well as the difference of between untrained men and judo fellows. Therefore, it is showed that both untrained men and judo fellows need a exorcise, which is suggested a objective and scientific the method and the need of motivation for health.