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직접추정법의 대칭적인 들기 작업의 최대허용하중 결정에의 적용에 관한 연구
이관석,박희석 대한인간공학회 1995 大韓人間工學會誌 Vol.14 No.1
In this paper, the effectiveness and accuracy of using the direct estimation method were investigated in determining a worker's lifting capacity or the maximum acceptable weight of lifting (MAWOL) of symmetrical fifting tasks in the workplace were investigated. Six lifting tasks involving two vertical fifting start-end points (0-80cm, 47-102cm) and three lifting frequencies (1, 2, and 4 lifts/minute) were studied. Ten young, male subjects performed the six lifting tasks to predict the MAWOL using the psychophysical method and the direct estimation method. The main results indicated that there were no significant differences between the MAWOLs determined by the two methods except for the lifting frequency of 4 lifts/minute. Analysis of variance was performed on the task rating data to check the consistency of the task rating across subjects, which revealed no significant difference.
OCRA 를 사용한 자동차산업의 근골격계질환 유해요인 평가 연구
이관석,정민수,김재형,전성재,천영지 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
Due to the high occurrence rate of musculoskeletal disorders (MSDs), many Korean companies adopted various assessment tools to evaluate workers’ musculoskeletal stress to identify works which need to be improved in auto manufacturing industry. Although many adverse working conditions and awkward postures have decreased through continuous improvement after such evaluations, workers who were exposed to repetitive activities and short recovery periods showed the lower job satisfaction level than other workers. Thus in this study, OCRA (The Occupational Repetitive Action tool) was used to check whether RULA evaluates workers’ musculoskeletal stress reasonably well since OCRA has been known to be a good evaluation tool for repetitive works and works with short recovery periods. The evaluation was conducted on 142 works and it was found that 65 works showed higher action levels by OCRA than by RULA. However, 13 works showed the reversed result and 52 works showed the same level regardless of the evaluation tool. Thus it is suggested that OCRA needs to be used with RULA together for the evaluations of musculoskeletal stress at workplaces where repetitive activities and short recovery periods exist.
李寬錫 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2
인체 측정 자료는 인간공학적인 제품의 디자인을 위해 기초적이고 구체적인 데이터를 제공한다. 그러나 아직까지 우리 나라에서는 인체 측정 데이터의 응용에 있어 여러 가지 어려운 점들이 존재한다. 따라서 보다 효율적이고 효과적인 인체 계측 자료의 응용을 위해 세계 표준이라고 말할 수 있는 ISO의 규격 현황과의 비교가 요구되어지며 국내 및 국외 기업의 인체 계측 데이터의 활용 현황의 고찰이 요구된다. 현재 통용되고 있는 인체 측정의 방법은 현재 국제적으로 통일되어 있으며, 세계 각국 공통으로 마틴의 인류 교과서에 준하여 생체와 두골의 측정이 행하여지고 있다. 그러나 산업계에서의 제품 설계를 위해서는 골계측을 주목적으로 한 마틴의 측정점으로는 충분히 만족할 수 없는 경우가 많으며, 산업 제품이나 의복의 설계에 맞추어서 새로운 측정점을 설정할 필요성이 요구되어 지고 있다. 본 연구에서는 1992년에 행하여진 국민 체위 조사에서의 측정 항목의 측정 방법 및 용어에 대하여 ISO와 비교 검토하였으며 인체 측정과 밀접한 의류 산업계의 국내의 치수 현황의 고찰을 통해 문제점 및 개선안을 제시하였다. 또한 효과적인 인체 계측 데이터의 응용을 위해 인체의 3차원적 연구, 인체 측정, 사이즈 분류, 규격 결정에 있어서 과학적인 기법에 의한 연구 성과가 밑받침이 되어야 한다. 특히 신체 발달 변화에 따른 연령 구분이 반영되어야 한다. Anthropometic standards provide a very important basis for product designs. Korean anthropometric standards were previously established and have been revised every five years. However, these data are not very user-friendly for applications. Thus, the standards need to be reviewed and improved. In this study, therefore, the Korean anthropometric standards were compared with ISO standard to find the areas to be improved. Further, the need of additional measurement dimensions in Korean industry were also studied. It was found that Martin´s measurement points were not enough for product design uses. This problem was significant for clothing designs. It was also found that diagrams could help users to find the dimensions for use.
국산(國産) 저질무연탄(低質無煙炭) 연소용(燃燒用) 유동층(流動層) 연소로(燃燒爐) 개발(開發) 및 열효율(熱效率) 증대(增大)에 관한 연구(硏究)
이관석,Rhee, K.S. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.2
Characteristics of heat transfer in a smooth and finned tube located vertically in atmospheric fluidized bed combustor which uses low grade anthracite coals was studied. Experiments to investigate the characteristics of heat transfer between smooth and finned tube are carried out and the results depend on particle size, fluidizing air velocity and bed temperature are summarized. It is found that heat transfer coefficient of the smooth and finned tube increases with decrease in particle diameter and increase in bed temperature. Furthermore, it is noted that heat transfer coefficient increase at the first with increase in the velocity of fluidizing air and tends to decrease at a certain fluidizing air velocity. The increase of heat transfer coefficient for the finned tube is appeared to be increased in 30% compared to that for the smooth tube.