[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.

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.

무도수련에서 형(形)의 의미

박순진,허건식,윤종대 龍仁大學校 武道硏究所 1998 武道硏究所誌 Vol.9 No.1

Various Katas have characteristics that the orders and methods of attack and defense was designed under agreement. Practicing Katas makes it possible to learn principles of various techniques and to acquire the techniques. These Katas are used for fair judgement and fair criteria to referee in game. Complex techniques have been analyzed and organized to have competitive martial arts from martial arts for training. Since various Kata have its technical implication with representing Kata of various train purposed martial arts, it should neither be criticized nor be modified with ease. Therefore Kata should be carefully studied with maintaining original factors and with organizing Kata for new technique.

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.

천연제올라이트를 지지체로 사용한 고온건식 아연계 탈황제의 반응특성 연구

박노국,정용길,이종대,이태진,김재창 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

고온건식 탈황제의 지지체로 알루미나와 천연제올라이트를 사용하여 아연계 탈황제를 제조하였으며 성능을 조사하였다. 두 가지 탈황제의 반응특성실험은 480℃/580℃(황화/재생온도)에서 칸 밸런스와 고정층 반응장치로 반응속도와 황수용능력을 비교하였으며 내마모 실험장치를 이용하여 탈황제의 내마모도를 조사하였다. 두 탈황제의 성능 실험결과 천연제올라이트를 지지체로 사용한 탈황제의 초기 황화반응속도가 알루미나를 지지체로 사용한 탈황제보다 빨라졌으며, 10 cycle에서 황수용능력이 20 gS/100 g sorbent 이상 유지되었다. 내마모성은 AI(마모지표)값이 14.7%정도였다. 본 연구에서는 천연제올라이트의 고온건식 탈황제의 지지체로 적용 가능성을 확인하였다. Two types of zinc-based sorbents using alumina and natural zeolite as the supports for hot-gas desulfurization were prepared, and investigated their desulfurization capability. Their reaction rate and sulfur capacity were compared by Cahn balance and over the fixed bed reactor system at 480℃/580℃ (sulfidation/regeneration). The attrition resistance was measured by ASTM methd. Thc initial sulfidation rate of ZnO/natural zeolite sorbent was higher than that of ZnO/alumina, and the sulfur capacity of ZnO/natural zeolite sorbent was maintained above 20 gS/l00 g sorbent for 10 cycles. A attrition index was 14.7%. The use of natural zeolite as a support of sorbents may be possible for hot gas desulfurization.

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.

서로 수직으로 편광된 이중 모드 고체레이저에 대한 동력학

박종대,조창호 배재대학교 자연과학연구소 2006 自然科學論文集 Vol.17 No.1

서로 수직으로 편광된 이중모드 고체레이저에서는 두 개의 이완 진동수가 존재한다. 이런 이중 모드 고체레이저를 변조시켜 주면 혼돈 등의 복잡한 현상이 일어날 수 있다. 본 논문에서는 수직으로 편광된 이중 모드 고체레이저에 대해 빛과의 상호작용에서 비등방성을 고려하여 맥스웰-블로흐 방정식을 유도하고, 이를 사용하여 복잡한 비선형 동력학적인 현상을 설명하였다. There are two relaxation frequencies in orthogonally polarized dual-mode solid-state lasers. Complex dynamic behaviors such as chaos can be observed by modulating orthogonally polarized dual-mode solid-state lasers. In this paper, we derived Maxwell-Bloch equations by considering anisotropy explicitly in laser-atom interactions and explained the complex nonlinear dynamical behaviors.

표준 용매 벤젠의 Rayleigh 비의 온도 의존성

박일현,이종근,윤관한,조동환,민병길,방대석 金烏工科大學校 2000 論文集 Vol.21 No.-

The Rayleigh ratio of benzene is a very important physical constant with which the integrated scattered intensity of laser light scattering can be converted into the absolute value. In this study temperature dependence of Rayleigh ratio of this solvent has been investigated with two different methods in the temperature range of 25-75℃. It was found that in the direct measurement the non-linear behavior of its Rayleigh ratio were observed as increasing temperature even if the scattering volume correction was applied to the scattered intensity of benzene. However the result of indirect measurement based upon the invariance of molecular weight of standard polystyrene polymer for any polymer solution temperature showed us that its temperature dependence up to 75℃ could be expressed with the Benoit's linear equation rather than the non-linear one. It seems that the scattered intensity in direct method has more complicate contributions at the elevated temperature. Further research works are necessary in order to solve such discrepancy clearly.

악성림프종 환자에서 복합화학요법으로 유발된 백혈구 감소증에 대한 인형 재조합 과립구 집락형성-촉진인자(rhG-CSF: Neutrogin)의 효과

박성규,전진우,기신영,유병우,김홍수,백승호,원종호,홍대식,박희숙 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

Clinical effects of rhG-CSF were investigated in 17 patients receiving chemotherapy for non-Hodgkin's lymphoma. Patients were given G-CSF 2㎍/㎏/day after 2nd cycle chemotherapy for least 14 consecutive days, and clinical and laboratory results were compared to results of the first cycle. Treatment with G-CSF resulted in increase of mean WBC count(952.9±152.2㎜³vs 1882.4±350.4/㎜³) and neutrophil count(212.9±53.0/㎜³vs 841.5±238.0/㎜³), reduced the duration of leukocytopenic days(12.4±1.3 days vs 5.5±1.0 days, WBC count less than 4000/㎜³) and neutropenic days(4.5±0.9 days vs 2.3±0.7 days, neutrophil count less than 500/㎜³), and reduced the duration of neutropenic fever(5.8±1.1 days vs 0.9±0.5 days). The side effects of G-CSF were not so significant. These results demonstrated that G-CSF is safe and useful for the treatment of neutropenia induced by anticancer chemotherapy of non-Hodgkin's lymphoma and reducing the incidence of febrile periods and duration of antibiotic administration.

기판온도와 레이저에너지에 따른 PbTe 박막의 결정구조 및 전기적 특성

박용대,박종만,정중현 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-

To determine how crystalline structure of PbTe thin films vary according to the growth temperature and laser energy, PbTe thin films were grown using PLD method on p-Si(100) substrates under a substrate temperature changing between room temperature(RT) and 400℃, the thin films were also prepared under different laser energies ranging between 100 mJ and 300 mJ. As a result of analyzing XRD patterns and FWHM of PbTe(200) rocking curve, it was found that PbTe thin film grown at the growth temperature of 200℃ and that obtained with laser energy of 200 mJ were best crystallized. The measurement of Hall effect indicated that PbTe thin films were n-type semiconductors and the current-voltage characteristic curve exhibited the typical p-n junction phenomenon. In addition, electric conductivity of PbTe thin films was found somewhat higher than that of general semiconductors.