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김성덕,임승운 대한마취과학회 1988 Korean Journal of Anesthesiology Vol.21 No.2
The circulatory responses to acute isovolemic hemodilution were studied in nine mongrel dogs in hypoxic (FIO2=0.15) environment. The animals were bled 20 ml/kg of blood. The shed blood was replaced by equivalent amounts of low molecular weight dextran (LMWD). Hemodynamic measurements and calculations were performed in control normoxic period, hypoxic period before bleeding, hypoxic period after bleeding and after hemodilution with LMWD. By hemodilution, Hb and Hct were decreased from 13.6±0.8gm/dl and 41±2% to 12.9±0.9gm/dl and 21±2%, respectively. Hypoxia itself did not cause any hemodynamic changes. Bleeding caused significant increases in SVR (60%) and PVR (77.9%), and resulted in decreases in CI (40.0%), TI (32.7%) and PCWP (2.0%) compared with the data in control period. Hemodilution reversed gemodynamic changes induced by bleeding. PVR returned to normal and SVR was rather decreased by 24.2%. CI, PCWP and CVP were increased by 25.4%, 6.0%, and 37.5%, respectively. The parameters such as HR and RPP which might be related to oxygen consumption were decreased by 10.6%, compared with control data. This study demonstrated that, in spite of lowered arterial oxygen content during hemodilution, tissue oxygen supply and cardiac performance might be well maintained by combined effects of decreased afterload and oxygen consuming factors, and increased preload. In conclusion, acute isovolemic hemodilution with LMWD might be a safe tolerable method in the aspects of circulatory respones in hypoxic dogs.
기상예보시스템을 이용한 가공송전선의 단기간 동적송전용량 예측
김성덕,이승수,장태인,장지원,이동일,Kim, Sung-Duck,Lee, Seung-Su,Jang, Tae-In,Kang, Ji-Won,Lee, Dong-Il 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.6
본 논문에서는 실시간 기상예보데이터를 사용하여 가공송전선의 단시간 송전용량을 예측하기 위한 방법을 제안한다. 기상청에서 제공되는 예보기온, 풍속등급 및 날씨코드와 같은 3시간 예보요소들을 분석하여 기상예보데이터와 실제 측정데이터 사이의 상관성이 분석되었다. 동적송전용량을 결정하는데 사용하기 위하여 이러한 요소들은 적당한 수치로 변환되었다. 또한 풍속과 일사량에 대한 신뢰도를 개선하기 위하여 적응뉴로퍼지시스템이 설계되었다. 기상예보데이터가 송전용량을 신뢰성을 갖도록 추정하는데 사용될 수 있음을 밝혔다. 그 결과 제안된 예측시스템이 단시간 용량예측에 효율적으로 실용화될 수 있을 것이다. A method for predicting the short-term dynamic line ratings in overhead transmission lines using real-time weather forecast data is proposed in this paper. Through some inspections for the 3-hour interval forecasting factors such as ambient temperature, wind speed grade and weather code given by KMA(Korea Meteorological Administration), correlation properties between forecast weather data and actual measured data are analyzed. To use these variable in determining the dynamic line ratings, they are changed into suitable numerical values. Furthermore adaptive neuro-fuzzy systems to improve reliabilities for wind speed and solar heat radiation ate designed It was verified that the forecast weather data can be used to predict the line rating with reliable. As a result it can be possible that the proposed predicting system can be effectively utilized by their anticipation a short-time in advance.
김성덕,이승수,장태인,강지원,이동일,Kim, Sung-Duck,Lee, Seung-Su,Jang, Tae-In,Kang, Ji-Won,Lee, Dong-Il 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.5
고가공도체의 최대허용전류인 열용량은 일반적으로 IEEE P738 기준에서 주어진 것과 같은 열평형 방정식을 기초로 계산된다. 이 정격은 기온, 풍속, 풍향 및 태양열과 같은 기상조건의 함수로 주어진다. 이러한 기상 파라미터들 중에 풍속은 그 값이 아주 작게 나타날 때 송전용량 결정에 강한 영향을 준다. 따라서 송전용량 모니터시스템에서 사용되는 풍속계 대부분은 낮은 감도와 실속 특성을 가지므로 부정확한 결과가 나타난다. 본 논문에서는 풍속계를 사용하지 않고 가공송전선의 동적송전용량을 결정하기 위한 새로운 방법을 도입한다. 풍속을 2개의 간접도체의 온도로 추정하고 실험을 통하여 추정풍속으로 구한 동적송전용량이 기상모델로 구한 결과와 매우 근접함을 밝혔다. The thermal rating of an overhead conductor, which is the maximum allowable current, is generally calculated on the basis of heat balance equation found in IEEE P738 standard. This is given as a function of the weather conditions such as air temperature, wind speed, wind direction, and sun heat. Wind speed among such weather parameters is strongly affected on determining the line rating when it appears very low level. Therefore there may occur inaccuracy since most anemometers used in line rating monitor systems may show low resolutions and stall speed performance. In this paper, we introduce a new methodology for determining the dynamic line rating in overhead transmission lines, without using my anemometer. It was shown that wind speed can be estimated by the temperatures of 2 indirect conductors, and through experimental study, the dynamic line rating obtained by the estimated wind speed was very closely that of weather model.
개에서 Lidocaine 과 Diltiazem 의 혈역학적 상호작용
김성덕,정익수 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.5
The hemodynamic interactions of lidocaine and diltiazem during halothane anesthesia were studied using eight mongrel dogs. The animals were anesthetized with inhalation of 1.0 MAC of halothane(GroupH) continuously throughout the experiment. 30 minutes after the inhalated and end-tidal halothane concentration reached equilibrium, 0.2 mg/kg of diltiazem was given intravenously over 2.0 min. From that point 8 ㎍/kg/min of diltiazem was continuously infused (group HD). Then a small dose of lidocaine(group HD1; iv bolus 1.5 mg/kg over l min, followed by continuous iv infusion at the rate of O.l mg/kg/min for 30 min) and a large dose of lidocaine (group HDI; iv bolus 1.0 mg/kg over I min, followed by continuous iv infusion at the rate of 0.3 mg/kg/min for 30 min) were administered serially. In group HD, PR interval increased significantly(22.2%) and coronary perfusion pressure decreased significantly(l9.3%), compared with group H. Compared with group H, significant increase in PR interval(44.4%), and decreases in diastolic arterial blood pressure(28%), mean arterial blood pressure(20.1%) and rate pressure product(35.2%) occured in group HD1. In group HDL, a significant decrease in heart rate(20.7%) and coronary perfusion pressure(33.0%) also occured, compared with group H. No significant changes in oxygen transport and consumption existed among groups. The most significant result of the injection of lidocaine diltiazem during halothane anesthesia in dogs was increase in PR interval. Even in high doses of lidocaine, only slight hemody- namic depression resulted and no significant changes in tissue oxygenation occurred. Therefore, the combined administration of diltiazem and lidocaine in clinical doses during halothane anes- thesia in dogs is a relatively safe administrative method.
공공스포츠센터 종사자의 경력정체가 냉소주의 및 반응행동에 미치는 영향
김성덕 한국체육대학교 체육과학연구소 2019 스포츠사이언스 Vol.37 No.1
The purpose of this study was to identify the Relationship among Career Plateau, Organizational Cynicism and the Response Behavior (EVLN) of Public Sports Facilities Members. In order to achieve this goal, the employees(n=187) working at the public sports facility in Seoul were selected to conduct the survey through the Convenience sampling method. Based upon the results of their responses, descriptive analysis and correlation analysis were conducted taking advantage of SPSS 20.0 and AMOS 20.0. And, in order to measure reliability, Cronbach's α was conducted. Also, in order to identify a set model based on theoretical grounds, suitability was assured through the analysis of structure equation modeling. And the results are as follows. (1) Public sport center members Career Plateau have Partial effect on Organizational Cynicism. (2) Public sport center members Career Plateau have Partial effect on Response Behavior (EVLN). (3) Public sport center members Organizational Cynicism have Partial effect on Response Behavior (EVLN). 본 연구는 공공스포츠센터 종사자의 경력정체와 냉소주의 및 조직 반응행동(EVLN)에 미치는 영향을 규명하는데 그목적이 있다. 이러한 목적을 달성하기 위해 2018년 9월부터 11월까지 서울시 산하 공공스포츠센터 종사자를 모집단으로 총 240명을 편의표집방법을 이용하여 표본을 추출하였고, 최종적으로 187부의 자료 를 SPSS 20.0, Amos 20.0 프로그램을 이용하여 기술통계분석과 빈도분석을 실시하였고, 신뢰도를 측정하기 위해 Cronbach's α 검사를 하였다. 또한 해당변인의 구성타당도를 검증하기 위해 확인적 요인분석, 상관관계 분석, 가설 검증을 위해 구조방정식 모형검증과 경로분석을 실시하였다. 그 결과 첫째, 공공스포츠센터 종사자의 경력정체가 냉소주의에 부분적인 영향을미쳤다. 둘째, 공공스포츠센터 종사자의 경력정체가 조직 반응행동(EVLN)에 부분적인 영향을 미쳤다. 셋째, 공공스포츠센터 종사자의 냉소주의는 조직 반응행동(EVLN)에 부분적인 영향을 미쳤다
배전선로 고장에 의한 Voltage Sag의 특성 해석
김성덕,Madhat M. Morcos 한국조명전기설비학회 2002 조명·전기설비학회논문지 Vol.16 No.1
송전선과 배전선의 고장에 의한 voltage sag는 산업 수용가와 전력회사에 당면한 가장 중요한 전력품질(power quality) 문제들 중 하나가 되었다. voltage sag는 일반적으로 진폭과 지속시간 특성으로 기술되지만 voltage sag 현상을 규명하여 그 대책을 찾는데는 위상변위 특성을 반드시 고려해야 한다. 이 논문에서는 3상지락, 단선지락, 및 선간단락 사고가 발생하였을 경우에, 고장임피던스의 변화에 의한 voltage sag를 symmetrical components 해석을 이용하여 특성해석을 하였다. 이 때, voltage sag와 이들이 진폭과 위상에 미치는 효과를 고찰하였다. 3상지락과 같은 평형 고장은 모든 상에서 전압과 전류가 동일한 값으로 변화되고 또한 영상성분들은 영이 되었다. 그렇지만, 단선지락과 선간단락 고장과 같은 불평형 고장으로 인한 voltage sag는 진폭과 위상이 각 상마다 다르게 변화되었다. 해석결과를 확인하기 위하여 전력회로 모델들을 토대로 시뮬레이션을 수행하고 그 결과들도 검토되었다. Voltage sags caused by line faults in transmission and distribution lines have become one of the most important power quality problems facing industrial customers and utilities. Voltage sags are normally described by characteristics of both magnitude and duration, but phase angle shifts should be taken account in identifying sag phenomena and finding their solutions. In this paper, voltage sags due to line faults such as three phase-to-ground, single line-to-ground, and line-to-line faults are characterized by using symmetrical component analysis, for fault impedance variations. Voltage sags and their effect on the magnitude and phase angle are examined. Balanced sags of three phase-to-ground faults show that voltages and currents are changed with equivalent levels to all phases and the zero sequence components become zero. However, for unbalanced faults such as single line-to-ground and line-to-line faults, voltage sags give different magnitude variations and phase angle shifts for each phase. In order to verify the analyzed results, some simulations based on power circuit models are also discussed.
고객 접점 스포츠 서비스 종사자의 개인-환경 적합성과 직무스트레스 및 이직의도의 관계
김성덕 한국스포츠학회 2015 한국스포츠학회지 Vol.13 No.4
The purpose of this study was to identify the relationship between Person-environment fit, job stress and turnover intention of employees in the sport service field. in order to achieve this goal, the employees(n=215) were selected to conduct the survey through the cluster sampling method. Using SPSS 20.0 and AMOS 20.0 the study provides descriptive analysis, correlation analysis, confirmatory factor analysis, and structural equations modeling analysis. The outcomes indicate that; (1) Person-environment fit have negative effect on job stress. (2) Person-environment fit is statistically significant to have negative effect on turnover intention. and (3) job stress has a positive impact on turnover intention.
체육계열대학생의 교수-학생 상호작용과 대학구성원 상호작용이 전공만족 및 대학생활적응에 미치는 영향
김성덕,이용국 한국스포츠학회 2014 한국스포츠학회지 Vol.12 No.4
The purpose of this study was to identify the effect of professor-student interaction and university member interaction of sports related majoring students on their school life adjustment. In order to achieve this purpose, 350 sports related majoring students were selected from University in Seoul and Chungnam by the cluster sampling method. Out of the 350 questionnaires responded to, only 305 were used for data analyses because 45 were responded to incorrectly. The instrument for data collection was a questionnaire in which recognized professor-student interaction, university member interaction, major satisfaction and school life adjustment consisted of items identified by Cho(2008) & Han(2009), Yoo, Choi, Yeu, Kwon, Kim, Lee and Kim(2010), Han(2014) and Lee(1999) & Son(2003) respectively. The instrument for data collection was a questionnaire whose validity was evaluated by an expert group and whose reliability was judged from the Cronbach's alpha values ranging from .59 to 90. Then data were analyzed using PASW 20.0 and AMOS 20.0. To conduct frequency analysis, exploratory factor analysis, correlation analysis, confirmatory factor analysis, structural equation model. The results first, it show that professor-student interaction and university member interaction affected major satisfaction. Second, it show that professor-student interaction and university member interaction affected school life adjustment. lastly, it show that major satisfaction affected school life adjustment.