2-Cinnamoyl thiophene의 가수분해 반응메카니즘

권기성,맹주양,박천규 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2

The rate constants for the hydrolysis of 2-cinnamoylthiophene were determined by UV spectrophotometry in 50% methanol-water at 29℃ and a rate equation which can be applied over wide pH range was obtained. From this equation, we may conclude the following: above pH12, the over-all rate is only dependent on the concentration of hydroxide ion and below pH 10, the reaction is initiated by the attack of water molecule on the activated carbon-carbon double bond. In the range of pH from 10 to 12, these two reactions occur competitively.

유아의 기관절개술에서 발관방지를 위해 고안된 기관절개 튜브

권진형,김성운,오천환 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Tracheostomy in infants and children is associated with a high rate of accidental decannulation in the early postoperative period. The most common complication in infants and children, which most often results in death, is accidental decannulation. Other authors advocate suturing tracheostomy tubes in place in infants and children under general anesthesia in operating room for avoiding decannulation. The authors designed tracheostomy tube for the prevention of accidental decannulation following tracheostomy in infant, so report with review of literatures.

LRFD 설계법에 의한 강박스거더 합성형교 설계 프로그램

김천용,권태형,이창열,신동구 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-

A C++ based computer program for the design of composite steel-concrete box girder by the LRFD method is developed. The program consists of a main program, a header program, and 16 function programs. The load analysis for live and dead loads is performed by using the influence line based on the 3-moment method. For the design of box girder, strength limit states, fatigue limit state, and service limit state are considered. In addition, the constructibility of the girder is also checked. The validity of the program is demonstrated by comparing the design result for 3-span continuous box girder by the present program with the one by hand-calculation.

武道選手들의 競技前 競爭不安에 關한 硏究

송순천,김진표,이권노 龍仁大學校 1997 용인대학교 논문집 Vol.14 No.-

The purpose of this study was to test marshal art players' unstable psychological conditions before their competitions. For this purpose, 42 Judo players, 32 Taekwondo players, 21 boxers and 21 wrestlers(total 126 players) who belonged to "Y" university training camp were sampled to be subject to the SCAT test in order to verify the differences of their psychological conditions by grade and event. The results of this study can be summarized as follows ; 1) As a result of testing the hypothesis 1, it was found that there were significant differences of psychological apprehensive conditions before competition among graders. Those freshmen players showed the highest level of apprehension(2.7500), followed by senior, sophomore and junior groups. 2) As a result of testing the hypothesis 2, it was found that there were no signifieant differences of psychological apprehensive conditions before competition among events. The boxers showed the highest level of apprehension (2.6938), followed by wrestlers, Judo players and Taekwondo players. 3) As a result of testing the hypothesis 3, it was found that there were significant differences of psychological apprehensive conditions before competition among events in case of freshmen and junior groups, while there were no significant differences of such conditions before competition among events in case of sophomore and seior groups.

금융의 글로벌화와 국제금융질서의 불안정

이천우,권선주 창원대학교 산업경제연구소 2001 産經硏究 Vol.18 No.-

노령의 대퇴 전자간 골절 치료에서 압박고 나사못의 안정성 및 유용성

김종오,노권재,윤여헌,고영도,유재두,정준모,방한천,정재학 대한골절학회 2003 대한골절학회지 Vol.16 No.2

목 적: 노령의 대퇴 전자간 골절에서 압박고 나사못의 안정성에 영향을 주는 인자들간의 상관 관계와 골절 양상에 따른 술후 고관절 기능을 평가 및 분석하였다. 대상 및 방법: 압박고 나사를 이용하여 수술적 치료를 시행한 231명의 환자 중 6개월 이상 추시가 가능하였던 60세 이상 84명의 환자들을 대상으로 했다. 방사선적 계측은 압박고 나사못의 활강 길이 및 내반각, 가압 나사 위치, 정복 상태, 원위 골편의 내측 전위를 측정하였으며 술후 기능은 Clawson의 기능 평가표로 하였고 골절 양상에 따라 방사선 계측과 기능 회복과의 상관 관계를 평가하였다. 결 과: 임상 결과는 불안정 골절에서 양호가 10례, 불량이 23례, 안정 골절에서는 양호 40례, 불량이 11례로 안정 골절에서 임상 결과가 좋았고(p<0.001), 압박고 나사 활강은 10 ㎜ 이상일 때 양호가 4례, 불량이 21례, 10 ㎜ 이하에서 양호가 46례, 불량이 13례로 10 ㎜ 이상 활강시에 술후 결과가 불량했다(p<0.001). 다르 방사선적 계측 요인은 결과에 의미있는 차이를 보이지 않았다. 또한, 불안정 골절 중에서 전위 양상 골절의 경우 10㎜ 이상 활강이 12례, 10㎜ 이하 활강이 8례, 분쇄 양상 골절의 경우는 10㎜ 이상이 11례, 10㎜ 이하가 2례로 분쇄 양상의 불안정 골절에서 10㎜ 이상 활강이 의미있게 많았다 (p<0.001). 결 론: 10㎜ 이상의 지연 나사 활강은 고관절 기능 회복 약화를 유발시킬 수 있으며 불안정 골절 분쇄 양상 골절은 이런 지연 나사의 활강이 과도하게 유발될 수 있으므로 불안정 분쇄 양상 골절에서 압박고 나사의 단독 사용은 재고해 보아야 할 것이다. Purpose: To evaluate the relationship between fracture stability and functional results, and analyze the correlation between stability factors and the outcome in intertrochanteric fracture of the elderly. Materials and Methods: Of the 231 patients, 84 patients with age above 60 were able to follow up for minimum 6 months. We measured the sliding length of the lag screw, varus degree, position of lag screw, reduction status and medialization of distal fragment radiologically. The functional outcome of the treatment was evaluated with the Clawson's result classification and we evaluated the correlation between the radiological results of measurement and the functional recovery depending on the Evans fracture classification. Results: There were good results in 40 cases out of 51 stable fractures, and in 10 cases out of 33 unstable fractures (p<0.001). In case of sliding of lag screw more than 10㎜, good results were obtained in 4 cases, and poor in 21. And in case of sliding less than 10㎜, good results were obtained in 46, and poor in 13. (p<0.001).But there was no relationship between other radiologic factors and clinical results. In unstable type, there were 12 cases with lag screw sliding more than 10㎜ and 10 cases with less than 10㎜. In comminuted type, there were 11 cases with lag screw sliding more than 10㎜ and 2 cases with less than 10㎜(p<0.001). Conclusion: The sliding of lag screw more than 10㎜ may result in poor outcome. As in comminuted unstable pattern, sliding of lag screw might be excessive, the use of compression hip screw alone is not good treatment option.

폐경기 여성에서 호르몬 대체 요법후 유방촬영상의 변화 양상에 대한 고찰

이주영,김권천 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Background : Increasing numbers of postmenopausal women are undergoing hormonal replacement therapy(HRT). We studied changes in the screen-film mammographic appearance of breast tissue after HRT. These changes included symmetric and asymmetric increase in breast density, and development of benign calcification etc. Methods : This clinical study was performed on 67 women that had been treated HRT at Chosun university hospital between January 1997 and June 1999. Results : 17 users(25%) had mammographic change after HRT, 8 had breast density change. 10 users had calcification or axillary lymph node enlargement change, but none had fibroadenoma of cancer change. Conclusion : There is no difference between each age group and the rate of breast change comparing with clinical factors, according to the increase of taken period, the rate of breast change was increased.

16 Bit Microprocessor를 이용한 유도전동기의 최적제어에 관한 연구

徐基永,金兌孝,權純杰,申千雨 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-

本 論文은 16 bit one-chip 마이크로프로세서를 이용하여 正弦波 變調 最適 PWM 制御方式을 채택한 인버어터에 관한 연구이다. 3相 誘導電動機의 可變速 運轉에서 스위칭시에 발생되는 損失의 증가 및 效率 저하의 원인이 되는 高周波成分과 이를 除去하기 위한 알고리즘을 해석하고,이 알고리즘을 실현하기 위해 制御用 16 bit one-chip 마이크로프로세서로 구성되는 hardware시스템을 設計함으로써 종래의 마이크로프로세서로 실현 불가능했던 on-line 계산 및 real-time 실현을 가능하게 하였다.이 시스템을 最適으로 制御하고 計算하기 위한 software를 개발하고,아울러 외부 시스템과 RS-232C로 통신할 수 있는 기능을 첨부하여 host computer에서 remote control이 가능하게 함으로써 MAP(manufacture automation protocol)에 대처할 수 있게 하였다. hardware 및 software의 設計에 따라 제작된 시스템의 高주波 制御效果를 확인하기 위한 實驗에서 現在 産業界에서 사용되고 있는 우수한 성능을 가진 것으로 알려진 特定모델을 선정하여 이와 比較 檢討하였다. 그 結果 인버어터의 基本波成分과 각 高調波成分의 스펙트럼이 出力周波數에 따라 다소의 차이가 있었으나, 測定 周波數의 전체범위에서 比較된 특정모델보다 우수한 特性을 얻을 수 있었다. This paper describes an inverter adopting an optimal sinusoidal waveform modulation PWM control method using 16 bit one-chip microprocessor. In variable speed operation of three-phase induction motor, a large number of harmonic components are included in switching waveform and cause decrement of efficiency. We analyzed some properties of each harmonic component and an algorithm for elimination of harmonics. In order to implement the algorithm, we designed a hardware system composed of special purpose 16 bit one-chip microprocessor. But it has been impossible to get a real-time computation. We compared and examined the effect of harmonics between the designed inverter and the commercial inverter. It was found that the designed inverter had more excellent suppression of harmonics than the selected commercial inverter over a range of all measured frequencies.

알레르기성 비염 환자에서 절지동물성 특이항원의 양성율 및 항원간 일치율

황규윤,남해선,박준수,권준택,백병준,김장묵,오천환,조성란 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

The current study was designed to evaluate the positive rates of arthropod allergens by Korean inhalant panel of MAST-CLA in patients with allergic rhinitis. One hundred sixty patients, diagnosed to allergic rhinitis in an Out Patient Center of Soonchunhyang University Chunan Hopsital during Aug 1998 to July 2000, were studied. 1. The overall positive rate among 35 specific allergens was 59.4% (95 patients). 2. The arthropod related allergen accounted for 82.1% (78 patients) of the positive rate. 3. Each positive rate of Dermatophagoides farinae (Df), Dermatophagoides pteronyssinus (Dp), house dust (Hd), and cockroach mix (Cm) was 45.0% (72 patients), 43.1% (69 patients), 28.1% (45 patients), and 8.8% (14 patients), respectively. 4.Significant agreement between arthropod allergens was observer (P < 0.05). 5. The obseved agreement between Df and Dp was 95.6%, showing most significant Kappa index (Kappa = 0.911, P < 0.001). There results suggested that although MAST-CLA is a useful measure of identifying specific allergens, the specificity of two mite allergen relatively low, implying because of common allergen between mites in Korean panel of MAST-CLA. Our data also supported that arthropod is the major cause of allergen in patients with allergic rhinitis, however, the MAST-CLA should be modified in order to exclude common allergen of mite and to include more specific mite allergen.

국내 최초 보툴리누스 중독증 발생 1예

정경태,강도현,유천권,최종현,성원근 대한임상미샐물학회 2003 Annals of clinical microbiology Vol.6 No.2