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조선업 근로자의 누적외상성질환 실태와 누적외상성질환 범용 작업위험도 평가도구를 이용한 작업분석
한상환,백남종,박동현,장기언,이명학,박종태,김대성,이연숙,백경자,신용수,송동빈 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.4
Cumulative trauma disorders were surveyed in a cross-sectional study of 100 male shipyard workers an 43 male office workers. And baseline checklist for risk assessment of cumulative trauma disorders was applicated in a ship making process. Cases of cumulative trauma disorders were defined using physical examinations and electronic diagnostic mathods. Data on demographics, individual factors(medical condition), work organization and psychosocial aspects of work were obtained by questionnaire. Association between the above factors and cumulative trauma disorders were assessed by multiple logistic regression models. 29(29%) participants of male shipyard workers and 4(9.2%) study subjects of male office workers met our case definitions for cumulative trauma disorders. The myofascial pain syndrome of neck muscles(12% of participants) and carpal tunnel syndrome(5% of participants) were the major two medical conditions in shipyard workers. The odds of male shipyard workers for cumulative trauma disorders to male office workers was 3.15 after adjustment of age(95% C. I. : 2.25-5.44). And the variables such as duration of present job, HIVD condition, and surges in workload were associated at least one of the cumulative trauma disorders in the final models(p<0.05). This study indicates that workrelated upper extremity musculoskeletal disorders are relatively common among shipyard workers, and shows that the psychosocial factors is not likely to be related to the occurrences of these disorders in heavy workers. Also we developed baseline checklist for risk assessment of cumulative trauma disorders. The checklist was unique in that its expected users were industrial hygienists and occupational healthing nurses who did not have much ergonomic background and in that it was targeted to Korean workers in various types. As the first application of the checklist, shipyard workers were evaluated.
Cumulative Trauma Disorders(CTDs) 관련 범용 작업의험도 평가서 개발에 관한 연구
송동빈,한상환,박동현 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.2
Today, CTDs (Cumulative Trauma Disorders) are one of major hazards in the US and European Industries disrupting work schedules, productivity and increasing workers compensation cost. The increase in injuries and their associated costs has led companies to form committees and implement programs to address this problem. Therefore, it is important that quantitative analysis tools help identify and assess industrial tasks that pose risk to workers. However, the process of quantifying risk in upper limb tasks is still in its infancy stage and calls for better measurement techniques are not going unheard. As the first work of quantification, baseline CTD checklist for risk assessment was developed in this study. It was mainly based on previous literature regarding CTDs. The checklist was unique in that its expected user was industrial hygienist who did not have much ergonomic background and in that it was targeted to Korean workers in various types of industries. As the list application of the checklist, some jobs in two industries(VDT, heavy industry) were evaluated, and compared with the medical data. Eighteen out of thirty items in the checklist was univariately significant(p<0.05) on the results of medical examinations. The correlation between medical data and total risk score from the checklist was 0.62. The feasibility of its use by an industrial hygienist was also checked by comparing with the results by an ergonomist. Their correlation (on the basis of Kendall's tau-b) in terms of total risk score was 0.74. The checklist in this study shows reasonably good performance for the first trial. Further research will have to include continuous refinement and validation for many more industries and many more jobs.
A Vison System to Improve the Safe Driving Management System
Donghyun Sung,Woon-Sung Lee 한국자동차공학회 2008 한국자동차공학회 Symposium Vol.2008 No.9
This paper describes our effort to add a vision system to the safe driving management system for performance enhancement. The safe driving management system monitors driver behavior, detects dangerous driving situations, and manages driving data effectively. A driving simulator has been used to evaluate effectiveness of the vision system in a laboratory environment. A low-cost CCD camera was placed on the roof of the driving simulator cabin. An image processing algorithm was developed to detect lanes and vehicles generated by computer graphics and displayed on a screen. The detection results of lane position, vehicle position and relative distance were combined with the dangerous driving detection algorithm to evaluate driver behavior more accurately. A case study on sudden stop and sudden lane change situations demonstrated the effectiveness of the vision system. The next step would be to test the vision system in a real driving environment.
임동현(Donghyun Lim),신윤혁(Yoonhyuk Shin),박현호(Hyun-Ho Park),고성로(Sung-Ro Go),김성철(Sung Chul Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
In this study, the electronic expansion valve was developed for air conditioning system of vehicles. The electronic expansion valve exploit cam driving structure for low manufacturing cost and high productivity. The pressure-resistant and flow rate performances was evaluated using numerical analysis. In the results of mechanical analysis, maximum, stresses of the valve model are about 98 MPa and 223 MPa respectively on maximum operation condition and burst pressure condition. Also, The flow rates of CO₂ and R134a according to orifice opening are measurement using flow simulation. The flow rates of the refrigerants were increased by valve opening rate. The maximum flow rates of CO₂ and R134a were about 550 kg/h and 386 kg/h respectively.