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직장 구조조정과 파업에 의한 근로자의 사회심리적 스트레스의 변화
박봉진,이종태,손혜숙,김성준 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Objective : This study was conducted to evaluate the insecurity of employment and anxiety by downsizing and strikes affected job characteristics and psychosocial distress of workers. Methods and Material : This is a longitudinal study of the container terminal workers in Pusan. The company operated downsizing from October to December in 1999 by economic depression. In the result of that, the number of workers decreased into 627 from 662. During that period, a new union was built and it made conflict between employers and employees, so the conflict caused the strikes from February to April in 2000. The first cross-sectional study was performed in February, 2000 and the oneyear follow-up cross-sectional study was performed in February, 2001. Socio-demo graphic characteristics, stress-related behavior, job characteristics and psychosocial distress were assessed with job content questionnaire(JCQ) and Psychosocial well-being Index(PWI) in 200 workers(white-collar: 100 men, blue collar: 100 men) from 662 men in total. Results : In the first study, job strain was high in the whole, but there was no difference between white and blue-collar workers. The level of PWI was very high at 86.67 points and the level of blue-collar workers was higher than that of white-collar workers(p=0.013). In the results of follow-up study, the rate of drinking and smoking decreased as the change of stress-related behaviors. In the job characteristics change, decision authority and physical exertion of the white-collar workers got lower(p<0.05), but social support and job strain didn't have no difference. In the PWI level change, stress level got rather higher(p<0.01), especially, increase of the white-collar workers' stress was big difference from that of the blue-collar workers'. Conclusion : Job stress management programs should be made to reduce stress. And in approaches to management and prevention, excessive physical exertion, shift work and irregular meals and breaks should be considered. Especially, this stress control program should be begun with recognition on conflicts between employers and employees and between employees and employees by downsizing and strikes. And also efforts to reinforce social support should be needed.
박봉진,이환기,정관수 한국수자원학회 1996 한국수자원학회논문집 Vol.29 No.5
Loopnet은 폐합형수계에서 물의 흐름에 관한 시간적 공간적 변화를 계산할 수 있는 부정류 해석프로그램이다. 본 연구에서는 이 모형이 적용하고 있는 Looped Solution 알고리듬을 유도하고, 폐합형수계의 시험하도를 구성하여 이 모형의 안정성 및 정확성을 시험해 보았다. 또한 굴포천 유역을 대상으로 이 모형을 적용하여 수공 구조물, 서해측의 조위와 유역의 홍수 유입 등을 고려한 홍수위를 산정하였다. 그 결과 모형의 안정성 및 정확성 시험에서 신뢰 Loopnet model was developed to simulate unsteady flow in the looped network channel, considering change of the time and space. In this study, the looped solution algorithm was derived and the accuracy and stability of the model was tested. The Gulpo river
박봉진,이환기,정관수,Park, Bong-Jin,Lee, Hwan-Ki,Jung, Kwan-Sue 한국수자원학회 1996 물과 미래(한국수자원학회지) Vol.29 No.5
Loopnet은 폐합형수계에서 물의 흐름에 관한 시간적 공간적 변화를 계산할 수 있는 부정류 해석프로그램이다. 본 연구에서는 이 모형이 적용하고 있는 Looped Solution 알고리듬을 유도하고, 폐합형수계의 시험하도를 구성하여 이 모형의 안정성 및 정확성을 시험해 보았다. 또한 굴포천 유역을 대상으로 이 모형을 적용하여 수공 구조물, 서해측의 조위와 유역의 홍수 유입 등을 고려한 홍수위를 산정하였다. 그 결과 모형의 안정성 및 정확성 시험에서 신뢰할 만한 결과를 얻을 수 있었으며, 운하의 운영수위는 굴포천 본류와 방수로구간 모두 홍수위 변화에 큰 영향을 미치지 못하였으나, 조도계수는 홍수위 변화에 중요한 물리적 요소 중 하나로 분석되었다. Loopnet model was developed to simulate unsteady flow in the looped network channel, considering change of the time and space. In this study, the looped solution algorithm was derived and the accuracy and stability of the model was tested. The Gulpo river system was used to calculate the flood water levels considering the hydraulic structures, tidal effect and inflow hydrographs. The result of the simulation showed that the accuracy and stability of this model was reliable. The change of flood water level of the Gulpo River system and the spillway section were not greatly affected by the operation water level of the navigation channel. But this analysis showed that roughness was one of the very important physical factor in changing flood water level.
유전자 알고리듬을 이용한 저류함수모형의 매개변수 추정에 관한 연구
박봉진,차형선 김주환 한국수자원학회 1997 한국수자원학회논문집 Vol.30 No.4
본 연구에서는 자연계의 적응 및 도태에 의한 Darwin의 진화과정을 수학적으로 체계화시킨 유전자 알고리듬(genetic algorithm)을 다목적댐의 홍수추적모형으로 사용되고 있는 저류함수법의 매개변수 추정에 적용하였다. 유전자 알고리듬은 생명체의 자연도태 원리를 수학적인 학습영역으로 적용한 탐색 알고리듬의 일종으로 매개변수의 추정은 개체유전과 적자생존법칙을 통해 설정된 모형의 성능을 개선시켜 나감으로써 최적값에 도달하게 된다. 수문순환계의 복잡한 In this study, the applicability of genetic algorithms into the parameter estimation of storage function method for flood routing model is investigated. Genetic algorithm is mathematically established theory based on the process of Darwinian natural selec