가스크로마토그래피/질량분석법에 의한 최적화 유도화 과정을 통한 Atrazine의 새로운 분석방법 개발

박승건,김승진,유영재,이용일 昌原大學校 基礎科學硏究所 2003 基礎科學硏究所論文集 Vol.15 No.-

Pesticides, with their high degrees of toxicity constitute a very impOrtant group target compound in environment samples. The use of many pesticides has been restricted or even banned while several years bemuse of their long residue times, persistence and bio-accumulation. Atrazine was derivatized using a single-step procedure by N,O-bis(trimathylsilyl)-acetamide acetonitrile in various solvent systems such as methanol, ethyl acetate, pyridine, and tetrahy&ofuran(Tl). The variables selected for study were the amount of reagents, the temperature and reaction times. The elelctron impact ionization mass spectra of the resulting derivatives are acquired and properly interpreted. Under the optinaized gas chromatographic conditions employed, an enhanced (3 times) peak height and an improved peak shape without any tailing. The purpose of this study was the development and application of GC-MS method for efficient analysis of atrazine.

변형시킨 polysulfones의 개선된 열적특성에 관한 연구

박승건,이용일 昌原大學校 基礎科學硏究所 2002 基礎科學硏究所論文集 Vol.14 No.-

Polysulfone(PSF)는 비결정성 수지로서 수축이나 휨이 극히 작고 또 높은 내열성, 강인한 기계적 성질을 가지고 있어 정밀성형용Engineering plastic 극히 우수한 재료이다.이Polysulfone(PSF)에 electron-withdrawing group과 electron-donating group을 치환 시켜을 때 이 물질들이 Polysulfone(PSF)의 열적안정도에 미치는 영향을 TermoGravimetry Analyzer(TGA)와 Differential Scanning Calorimeter(DSC)을 사용하여 비교 조사하였다.Polysulfone(PSF)의 열분해 온도(air, argon조건하에서)는 대략 400∼550℃이다.이 때 Polysulfone(PSF)에 electron-withdrawing group을 치환시키면 열분해 온도가 증가함을 볼수있고, electron-donating group을 치환시키면 열분해 온도가 감소함을 볼 수 있었다.

中小企業 育成方案에 관한 小考

박준영 건국대학교 1982 商經論叢 Vol.- No.17

대학생 축구선수의 등속성 체간근력과 대퇴근력 및 거퇴근력과의 관련성

박기용,홍석민,최경훈,추근도 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.6

The purpose of this study was to investigate the relationships among trunk muscle, knee, and ankle strengths using Cybex770, the isokinetic muscle functioning measurement device. 41 K and Y University soccer players who did not have any experience about back pain or spine surgery were recruited as subjects. The results of the study were as follows. 1. Trunk extension was significantly higher than trunk flexion and muscle strength was diminished with increasing load speed. 2. Trunk flexion/extension ratio was well balanced at 30。/sec but this balance was broken with increasing load speed. 3. At 60。/sec of load speed, the knee extension and flexion of the left side were higher than those of the right side. 4. At 60。/sec of load speed, the ipsilateral muscle strengths of the left knee were well balanced but those of the right side were imbalanced. 5. At 60。/sec of load spped, the ratio of bilateral muscle strength of knee was -18.5±32.3% and this implies the possibility of knee injury. 6. Plantalflexion and dorsiflexion of the right ankle were higher than those of the left side, and dorsiflexion/plantalflexion ratio of the left side was higher than that of the right side. 7. The ratio of bilateral muscle strength of ankle at 60。/sec of load speed represented a balanced muscle development but this balance was broken with increasing load speed.8. There were partially significant relationships between trunk muscle and knee strengths. and between knee and ankle strengths. In conclusion, the trunk muscle strength of soccer player might be a very important factor to improve performance. In addition. a training technique which considering strength and speed is needed to develop not static but dynamic strength. This training not only develops well balanced muscle strength but also protects sport injury. Thus, the isokinetic training of trunk could improve the trunk muscle strength. and increase the ability of flexion/extension of knee and ankle.

내시경역행성담췌관조영술 후 발생한 종격동기종, 피하공기증, 긴장성 기흉 1예

조용건,이현승,권균홍,김자영,김봉진,김지연,배용목,박선자 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4

However, Endoscopic retrograde cholangiopancreatography (ERCP) is still helpful procedure for the diagonosis of the pancreatobiliary disease and treatment through endoscopic sphinterectomy (EST) is relatively safe, these have possiblity of complications such as hemorrhage, infection, panceatitis, and perforation. ERCP related perforation was rarely reported in 0.3 to 1.1% of previous study, but most serious complication. A report of Pneumomediastinum, Tension Pneumothorax complicating perforation after ERCP and EST is very uncommon. In our hospital, we experienced case of pneumomediastinum, subcutaneous emphysema, and tension pneumothorax after ERCP and EST, and the patient (a 58 years old female with suspicious common bile duct stone) was treated successfully with conservative treatment.

장애인 스포츠권(權)과 법적 필요성에 관한 연구

추근도,박기용,최경훈 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.6

This research intend to discuss the necessity so that the disabled can find the right for their sports activity and think of their basic right such as the legal ideas, the reality, the functions and the contents of the physical education and sports, and the necesstiy to build up the laws. And then it come to a conclusion as follows. First, the laws of the sports for the disabled should contain the guarantee of the social approach right and the equal of opportunity to them. They must be a value conception possible when the social environment is improved that the real disabled can make an access freely. And the reality that they can approach should be made through the process for their welfare because it isgenerally shaped on the noraml people. Second, the sporting rights of the disabled should be carried on in a survival place and need to make sports laws in an organizational size to make an harmony with the modern society and have a rational relation with several social institutions. Third, to make normal social life, the disabled should be able to get education first, work, move freely in society and approach to the sports facilities, some information, and tele-communication tools that they can enjoy sports, leasure and pleasure life. The convience facilities should be installed that they can move most shortly in using them and guarantee that they can make use of the public building, facilities and information as equally as the normal people do. Fourth, the legal knowledge to cope with regnition change about the physical education and sports, and the continuous research of their laws should be needed and be developed. From now on, we don't mandate the legal problems of the physical education and sports to the legal profession but we ought to think of and correct the indulgence and ingnorance of the disabled's right for the sports. With the critical and rational insight and knowledge, many studies and activities about the laws of the physical education and sports that can be with the disabled should be made.

사회복지에 있어서 자원봉사활동의 실태와 활성화 방안

최용호,김종환,박근수,노병수 朝鮮大學校 社會科學硏究所 2004 社會科學硏究 Vol.25 No.1

논에서 물과 양분관리에 따른 메탄(CH_4), 아산화질소(N_2O) 배출 특성

김건엽,박상일,송범헌,신용광 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2

물관리방법을 달리한 상시담수와 간단관개에서 메탄과 아산화질소의 배출 양상과 서로 다른 종류의 유기물원 및 질소비료 시용에 따른 메탄과 아산화질소 배출을 비교하고 저감 할 수 있는 방법을 찾기 위해 본 시험을 실시하였다. 물관리방법으로는 상시담수 (이앙∼출수 35일까지 담수)와 이앙 35일 이후 중간낙수한 간단관개 (중간낙수기간 20일),그리고 시비방법으로는 토양을 검정한 시비량인 토양검정, 토양 검정시비량+볏짚 돈분액비, LCU 완효성비료 그리고 N을 시용하지 않은 대조구 등을 처리하여 메탄 및 아산화질소 배출량을 측정하였다. 메탄 배출량은 간단관개보다 상시담수에서 높았고, 아산화질소 배출량은 이와 반대로 나타났다. 유기물과 비료시용 종류에 따른 메탄과 아산화질소 배출량은 액비와 검정시비+볏짚시용구에서 가장 높았으며, LCU 완효성비료구에서 가장 낮았다. 지구온난화잠재력으로 환산한 온실가스 배출은 물관리 조건에서 상시담수가 간단관개보다 170∼208% 높았으며, 요소를 시용하고 상시담수를 기준 한 것과 간단관개로 물 관리하여 각 처리에 따라 온실가스 배출을 비교하면 요소는 41.4%, LCU 완효성비료 55.8%로 온실가스 배출을 줄일 수 있는 것으로 나타났다. 그리고 비료이용효율은 LCU완효성비료, 액비>검정시비+볏짖>검정시비 순이었다. Emission of methane and nitrous oxide affected by nitrogen fertilizer materials were measured simultaneously in rice paddy fields under flooding and intermittent irrigation in 2000. Studies focused on mitigating CH_4 emission from rice paddy fields are summarized and the possibilities and limits applied to world's rice cultivation are discussed. The mitigation options are water management, soil amendments, organic matter management, different tillage, rotation, and cultivar selection. Altering water management, in particular promoting midseason aeration by short-term drainage, is one of the most promising strategies, although these practices may be limited to the rice paddy fields where the irrigation system is well prepared. The test site was divided into two water managements: a continuously flooded plot which was maintained flooded by constant irrigation from May to September, and an intermittently drained plot in which short-term (20days) draining practices were performed one times during the flooding period. By total emission of GHGs converted by global warming potential (GWP), flooding plots were higher 170~208% than intermittent irrigation plots. For emission of GHGs in fertilizer materials, it was high in the order of Swine slurry>Urea+Rice straw>Urea>LCU. Basing on GHGs emission of urea fertilization under flooding as baseline GWP of urea fertilization and Latex-coated urea under intermittent irrigation showed lower GHGs emission by 41.4% and 55.8%, respectively. In this case fertilizer use efficiency (kg unhulled rice/kg of applied N) were 18.2~20.2 and 18.7~19.0 and 9.3 and 5.8~6.6 for Swine slurry and LCU and Urea+Rice straw and Urea in the continuously flooded and intermittently drained plot.

온도 기울기(temperature gradient) 젤에서 Heteroduplex Analysis 기법을 이용한 돌연변이 DNA의 검출

조용석,구미자,박귀근,박영서,강종백 A.R. Liss 1998 ENVIRONMENTAL MUTAGENS AND CARCINOGENS Vol.18 No.2

LaMnO₃형 페롭스카이트 산화물에서 입자상물질의 촉매연소반응

이용화,이근대,박성수,홍성수 한국환경과학회 2004 한국환경과학회지 Vol.13 No.7

We have studied the catalytic combustion of soot particulates over perovskite-type oxides prepared by malic acid method. The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxide. In addition, the reaction conditions such as temperature and O₂ concentration were investigated. The partial substitution of alkali metals into A site in the LaMnO₃ catalyst, enhanced the catalytic activity in the combustion of carbon particulate and the activity was shown in the order: Cs>K>Na. For the La_(i_x)Cs_(X)MnO₃ catalysts, the catalytic activity showed the maximum value with x=0.3 but no more increase on the catalytic activity was shown with x> 0.3. For the La_(0.8)Cs_(0.2)MnO₃ catalyst, the substitution of Fe or Ni increased the ignition temperature. The ignition temperature decreased with an increase of O₂ concentration, however, no more increase in the catalytic activity was shown with O₂ concentration >0.2. The introduction of NO into reactants showed no effect on the catalytic activity.