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자동차부품 제조업 근로자의 작업능력과 직무스트레스에 대한 연구
목연수 ( Yun Soo Mok ),이동원 ( Dong Won Lee ),장성록 ( Seong Rok Chang ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.3
According to the Statistics Korea, in 2011, people over the age of 65years old accounted for 11.8%of Korea′s population. This number is expected to rise to 15.0% by 2019, making Korea an “aged society”. As age increases, physical ability degrades to the point that the workload musk be adjusted limitations. However, workloads are given regardless of workers′ ages or abilities. In addition, a decline in work efficiency due to aging also increases the risk of work-related injuries. Furthermore, the cases of stress related diseases along with musculoskeletal disorders (MSDs) rise as main factors of industrial disasters and excessive job stress gives negative influence not only on mental health but also on physical health so that job stress becomes a hot issue as a main cause of work ability falloff and turnover. The purpose of this research is to examine how the sociodemographic characteristics, MSDs symptoms and musculoskeletal workload of workers in the manufacturing industry of automobile parts influence work ability and job stress. As a result of the research, job ability showed significant differences statistically according to age, working year, sex, marital status and musculoskeletal workload and job stress showed significant differences statistically according to age, working year, marital status and musculoskeletal workload. In addition, it showed that as the worker′s job ability decreases, job stress increases.
목연수,장성록,이영섭,고성석 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2
Current fire safety in the construction sites has developed piecemeal over a considerable period of time. However, the law and regulation of fire safety is insufficient to protect fire in the construction sites. The frequency of fire in the construction sites is very rare but it brings longterm deterioration durability of building structure and large scale industrial calamity. There are many process of works and each work deals with many kind of flammable material, so it is very difficult find a proper safety fire prevention. This study executed the questionnaire and fire experiment of the welding work to provide effective fire prevention counterplan.
기포탑내에서의 n - 프로판올과 iso - 프로판올 수용액의 기체체류량에 관한 연구
목연수,김상렬 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.2
n-프로판올과 iso-프로판올의 제조에서 얻어지는 숭요액을 증류할 때 각각 72%(wt)와 88%(wt)농도에서 공비혼합물을 형성한다. 따라서, 이것들을 공비증류에 의하여 효과적으로 분리하기 위해서는 이것들이 기-액 접촉을 할 때 생성되는 기체의 체류량(holdup)을 아는 것이 중요하며, 이를 위해 이들 수용액의 농도, 점도, 온도, 그리고 표면장력과 기체분산판의 형태 및 기체유속변화에 따른 기체체류량을 측정하였다. 실험결과로부터 기체체류량에 대한 수용액의 표면장력, 점도, 기체유속, 분산판의 형태 등과의 상관성을 다음과 같이 수식화하였다. Φ(δ/D ε)(μ_Lμ_G/σ_L) × 10^(10) = KR^n_(eG) When aqueous solutions obtained from the production of n-propanol and iso-propanol are distilled, azeotropes are formed at the concentrations of 72 wt% and 88 wt% respectively. So it is important to predict the gas holdup in an aqueous solution with gas-liquid contact for the effective separation by the azeotropic distillation. In this study, the gas holdup of the solution was measured at the different concentration and temperature to investigate the effect of variable physical and temperature to investigate the effect of variable physical properties such as viscosity and surface tension along with different patterns of distribution plate and different gas velocity. From the experimental result, a correlation between the gas hotdup and surface tension and viscosity of aqueous solution, gas velocity, and pattern of distribution plate was found as foltows; Φ(δ/D ε)(μ_Lμ_G/σ_L) × 10^(10) = KR^n_(eG)
Na2CO3 - NaOH 혼합용융염과 물의 접촉에 의한 증기폭발에 관한 연구
목연수,소목회천추,상원양일 한국산업안전학회 1989 한국안전학회지 Vol.4 No.1
Molten salt-water explosion caused by the contact between molten salt and water is one of vapour explosions. An experimental study of the vapour explosion, which occurs when the molten mixture of Na₂ CO₃-NaOH and water come in contact was performed. The pressure wave generated in each composition of molten mixtures was measured. The results obtained are as follows; 1) The vapour explosian didn't occur for a molten salt of 100%- Na₂CO₃. 2) For a molten salt of Na₂CO₃80%-NaOH 20% mixture, a small vapour explosion occured initially, and a large vapour explosion, which showed the largest pressure wave among the present experiments, occurred after an induced period. 3) For molten salt of Na₂CO₃60%-NaOH 40% mixture and Na₂CO₃, 40%- NaOH-60% mixture, the vapour explosion occurred near the water surface shortly after they come incontact with water. This explosion would be caused by fragmentation of the molten salts due to impulse generated when the molten salts and water come in contact.