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Jaehoo Lee,Bohyun Sim,Bonggyun Ju,Chul Gab Lee,Ki-Soo Park,Mi-Ji Kim,Jeong Ho Kim,Kunhyung Kim,Hansoo Song 대한직업환경의학회 2022 대한직업환경의학회지 Vol.34 No.-
Background: The musculoskeletal disease (MSD) burden is an important health problem among Korean fishers. We aimed to investigate the indicators of the prevalence of MSD and contributions of significant indicators to MSD in Korean fishers. Methods: This cross-section study included 927 fishers (male, 371; female, 556) aged 40 to 79 years who were enrolled from 3 fishery safety and health centers. The outcome variable was one-year prevalence of MSD in 5 body parts (the neck, shoulder, hand, back, and knee). Independent variables were sex, age, educational attainment, household income, job classification, employment xlink:type, hazardous working environment (cold, heat, and noise), ergonomic risk by the 5 body parts, anxiety disorder, depression, hypertension, diabetes, and hyperlipidemia. The adjusted odds ratio of MSDs by the 5 body parts were calculated using multiple logistic regression analysis. We computed the population attributable fraction (PAF) for each indicators of MSDs using binary regression models. Results: The one-year prevalence of MSD in the neck, shoulder, hand, back, and knee was 7.8%, 17.8%, 7.8%, 27.2%, and 16.2% in males vs. 16.4%, 28.1%, 23.0%, 38.7%, and 30.0% in females, respectively. The ergonomic risk PAF according to the body parts ranged from 22.8%–59.6% in males and 22.8%–50.3% in female. Mental diseases showed a significant PAF for all body parts only among female (PAF 9.1%–21.4%). Cold exposure showed a significant PAF for the neck, shoulder, and hand MSD only among female (25.6%–26.8%). Age was not a significant indicator except for the knee MSD among female. Conclusions: Ergonomic risk contributed majorly as indicators of MSDs in both sexes of fishers. Mental disease and cold exposure were indicators of MSDs only among female fishers. This information may be important for determining priority risk groups for the prevention of work-related MSD among Korean fishers.
김수현(SUHYUN KIM),양재호(JAEHOO YANG),박세라(SERA PARK),김수완(SUWAN KIM),황충구(CHOONGGU HWANG),이개명(GAEMYOUNG LEE) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.10
풍력발전과 태양광발전 등의 신재생에너지원에 의한 발전은 전력소비가 증가할 때 전력공급자가 요청한다고 발전을 할 수 있는 것은 아니다. 전력소비가 피크에 있을 때 신재생에너지원에 의한 발전소가 어느정도 출력을 내는 지는 중요한 요소이다. 우리나라의 경우 태양광발전소는 하계 전력피크타임에 가동률이 높기 때문에 다른 신재생에너지원에 의한 발전보다 하계피크전력 공급에 기여도가 크다. 본 연구에서는 제주도에 건설되어 있는 1MW급 태양광발전소의 전국과 제주지역 하계 전력피크타임 일에 전력공급 기여도를 분석하고, 한국전력(주)에서 제공하는 전기요금제의 계절별 시간대별 구분표의 구분에 따른 전력공급 기여도를 분석하고자 한다.
진재현(Jaehyun Jin),박병석(Byungsuk Park),안성호(Sungho Ahn),윤지섭(Jisup Yoon),정재후(Jaehoo Jung) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, fault tolerant mechanisms are presented for a servo manipulator system designed to operate<br/> in a hot cell. A hot cell is a sealed and shielded room to handle radioactive materials, and it is dangerous for<br/> people to work in the hot cell. So, remote operations are necessary to handle the radioactive materials in the<br/> hot cell. KAERI has developed a servo manipulator system to perform such remote operations. However,<br/> since electric components such as servo motors are weakened with radiation, fault tolerant mechanisms have<br/> to be considered. For fault tolerance of the servo manipulator system, hardware and software redundancy has<br/> been considered. In the case of hardware, radioactive resistant electric components such as cables and<br/> connectors have been adopted and motors driving a transport have been duplicated. In case of software, a<br/> reconfiguration algorithm accommodating one motor's failure has been developed. The algorithm uses<br/> redundant axes to recover the end effector's motion in spite of one motor's failure.