• 대한인간공학회지
• /
• 제22권3호
• /
• pp.13-26
• /
• 2003

The purpose of this study is to investigate the present conditions of the night work and shift work systems in the heavy chemical industrial complexes found in Changwon, Masan, and Chinhae. Korea. We will attempt to define and classify their problems; and to discover further ways to improve their systems. Fifty production factories were carefully selected as the subjects for this study. The shift systems were classified into five categories. The consecutive night shifts were long in almost all cases with 6 days (36 factories) and 7 days (13 factories). It was found that the night work of about] 2 hours continues for a long period in the weekly rotation full-day shift systems and the night-including non-full-day shift systems, and there was no holiday during a shift cycle in the continuous full-day shift systems. The work time in most shift systems was longer than the 44-hours/week permitted by Korean law. Considering the characteristics of these various types of shift systems, the most essential thing to reduce the shift workers' work load may be to shorten their working hours and improve the schedule of shift systems. It is highly recommended as a fundamental solution. to reduce the portal-to-portal hours from 12 to 8 in the night-including non-full-day shift systems and the weekly rotation full-day shift systems, and at least to employ a 4-team 3-shift system in the continuous full-day shift systems. In addition to this, it should from now on be taken as a goal to restructure the types of shift systems by taking such measures as avoiding continuous night work if possible, providing sufficient off-duty intervals both before and after night shift, providing increased opportunities for workers to nap during night work. and increasing the number of holidays.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2007년도 정기학술발표대회 논문집
• /
• pp.567-570
• /
• 2007

최근의 이상기후현상은 지구온난화에 의한 것으로 전 세계적으로 많은 영향을 미치고 있으며, 모든 산업분야에서 이슈가 되고 있다. 우리나라도 지구온난화로 인해 기후변화를 겪고 있으며, 건설 산업 또한 이러한 영향으로부터 자유로울 수 없다. 그러나 아직까지 건설 분야에서 이와 관련한 연구는 미미한 실정이다. 따라서 이에 대한 필요성을 인식 하고 현재 수준을 파악하기 위해, 본 연구에서는 지구온난화가 건설업에 미치는 영향 중 건설공기부분에 초점을 맞추어 분석하였다. 그 결과 지구온난화로 인한 기후변화에 따라 철근콘크리트 공사의 작업불능일의 변화추이를 살펴볼 수 있었고, 이를 토대로 지구온난화가 건설 공기에 미치는 영향의 일부를 파악할 수 있었다. 본 연구는 향후 기후와 함께 변화하는 국내 건설 산업의 미래를 예측하고, 이에 대응하기 위한 기초자료로 활용될 수 있으리라 기대된다.

• 국제학술발표논문집
• /
• The 5th International Conference on Construction Engineering and Project Management
• /
• pp.397-402
• /
• 2013

In super-tall building construction projects, schedule risk factors which vertically change and are not found in the low and middle-rise building construction influence duration of a project by vertical attribute; and it makes hard to estimate activity or overall duration of a construction project. However, the existing duration estimating methods, that are based on quantity and productivity assuming activities of the same work item have the same risk and duration regardless of operation space, are not able to consider the schedule risk factors which change by the altitude of operation space. Therefore, in order to advance accuracy of duration estimation of super-tall building projects, the degree of changes of these risk factors according to altitude should be analyzed and incorporated into a duration estimating method. This research proposes a simulation model using Monte Carlo method for estimating activity duration incorporating schedule risk factors by weather conditions in a super-tall building. The research process is as follows. Firstly, the schedule risk factors in super-tall building are identified through literature and expert reviews, and occurrence of non-working days at high altitude by weather condition is identified as one of the critical schedule risk factors. Secondly, a calculating method of the vertical distributions of the weather factors such as temperature and wind speed is analyzed through literature reviews. Then, a probability distribution of the weather factors is developed using the weather database of the past decade. Thirdly, a simulation model and algorithms for estimating non-working days and duration of each activity is developed using Monte-Carlo method. Finally, sensitivity analysis and a case study are carried out for the validation of the proposed model.

• 한국환경보건학회지
• /
• 제45권6호
• /
• pp.675-687
• /
• 2019

Objective: Methyl bromide (MB) fumigant has been shown to be fatal to human when was exposed. However, it were still used the significant amount in quarantine disinfection sites. The purposes of this study were to assess the MB exposure status and characteristics by fumigation-related workers and to provide supporting data for management plan. Methods: For this study, the three groups related to fumigation work were composed. A total of 107 workers were directly exposed, 20 field inspectors were indirect, and 20 general quarantines were not exposed. The urinary bromide ion concentrations in each group were analyzed by using HPLC/ICP-MS, and the working characteristics were identified using the structured questionnaire. Results: The urinary bromide ion concentration in the exposed group of fumigation workers was higher than the indirect and non-exposed groups. In the work characteristics of workers, there was a significant tendency to increase urinary bromide ion concentrations with higher fumigation work years (≤4 years: 2.84 (1.13-7.11) mg/g cr, >4-15 years: 5.36 (4.37-6.57) mg/g cr, >15-37 years: 6.69 (5.27-8.49) mg/g cr, p=0.034). In the comparison of the average number of working days per month, the more working days, the higher the urinary bromide ion concentration was statistically significant (≤12.5 days: 2.59 (1.19-5.65) mg/g cr, >12.5-19.25 days: 5.46 (4.62-6.44) mg/g cr, >19.25-27.25 days: 7.93 (5.93-10.59) mg/g cr, p=0.002). Conclusion: This study was the first nationwide survey including biological monitoring in workers exposed to methyl bromide. The results of this study were expected to be used as a reference for workers' health rights in relation to fumigation, prevention of addiction accidents, and safe management plan.

• 한국환경보건학회지
• /
• 제35권5호
• /
• pp.426-432
• /
• 2009

Asbestos is a commercial term of natural occurring silicated minerals and forms long, thin fibers. Chrysotile, the serpentine asbestos, accounts for most use in commercial use. Asbestos is well known health hazard material and it is proved that inhalation of asbestos fibers leads to increased risk of developing several diseases such as lung cancer, mesothelioma, asbestosis. In these days, people most at risk for exposure are maintenance and construction workers and general citizens who are working on and close to the work area at which asbestos containing material is disturbing. Non asbestiform, though its chemical composition is same with regulated asbestos, is known to be less hazardous than asbestiform. Exposure guideline, 0.01 f/ml, is not safe level in terms of health risk. It is reasonable to take preventable action when asbestos is suspicious. In Korea, it is necessary to clarify the concept between hazard and risk, to differentiate asbestiform from non asbestiform, to make regulations for compensation for asbestos related patients, to manage future exposure for general citizens.

• Asian-Australasian Journal of Animal Sciences
• /
• 제13권9호
• /
• pp.1329-1336
• /
• 2000

Two experiments were carried out to investigate the effect of Murrah buffalo cows pulling sledges under field conditions on milk production and milk composition. In Exp. 1, 24 buffaloes in the fourth month of lactation were used. They were allotted to four treatments according to a $2{\times}2$ factorial arrangement: work or no work, and with or without urea-molasses cake supplementation (700 g/animal/day). Feeds consisted of 20 kg fresh elephant grass (18% DM), 2 kg rice bran per day and rice straw ad lib. The animals worked in pairs three hours per day (work done: $3464{\pm}786kJ/d$) five days a week for three months. Three teams worked in the morning and the others worked in the afternoon in the same day. The following day the working times were switched. In Exp. 2, 16 lactating Murrah buffalo cows in the sixth month of lactation were allotted to two groups (work and no work). They were fed with fresh ruzi grass (Brachiaria ruziziensis) ad lib. supplemented with 2 kg rice bran and 700 g urea-molasses cake. The working regime was similar to that of the first experiment (work done: $3753{\pm}879kJ/d$) and they worked for two months. In the first experiment, there was a small but significant drop (p<0.05) in milk yield from 3.5 to 3.0 kg/day due to work, but there was no supplementation effect. The working buffaloes lost 5.2 kg whereas the non-working animals gained 9.7 kg during the three months (p<0.05). Supplementation increased live weight by 9.9 kg as compared to -5.4 kg for those not supplemented (p<0.05). Milk composition was not affected by the treatments. In the second experiment, daily milk production was similar for both treatments and approximately 3 kg. No significant differences were found in milk composition or in live weight changes for working and non-working groups, respectively. It was concluded that work may cause a reduction in milk yield and a loss of live weight on a poor rice straw diet but that an appropriate supplementation can alleviate this situation.

• 공학교육연구
• /
• 제19권1호
• /
• pp.54-60
• /
• 2016

This paper was built for an activation of a merged education and development of non-subject, new type creative merged education program having effectivities. This program is disciplined a kind of flipped learning and camp program of 2 nights and 3 days. Given a problem which big enough and open-ended problem, multidisciplinary team that composed with engineering and design major students works the capstone design project. For ordinary engineering design process, 'how can we make?' was important. But in this program 'what can we make?' is more serious question. Our program was pursuing an creative idea that can induce innovation. Teaching or interference of professors was minimized and then students solve the problem theirselves by long time and liberal brainstorming. Last products is not real goods and only a proposal for manufacturing. Finally, the results are presented using ppt and board. After not only professors but also students of other teams can ask a question, resolve and comment on that proposal. The benefits of this program are that inner members of university take a whole process from planning and working to last evaluation. Besides economic benefit, they can secure an infrastructure for development of creative merged education program by running for several times and so can improve the program continuously. For an aspect of students, they can respond to recently highlighted creative experiences that required for recruitment.

• 성인간호학회지
• /
• 제27권6호
• /
• pp.707-717
• /
• 2015

Purpose: This study was to develop and verify the effects of the exercise-cognitive combined dual-task training program on cognitive function and depression of the elderly with mild cognitive impairment (MCI). Methods: A non-equivalent control group pretest-posttest design was used. The participants were assigned into two groups: an experimental group receiving an exercise-cognitive combined dual-task (n=20) and a control group receiving a simple-task (n=18). After 8 weeks of intervention (2 days per week), the change in depression and cognitive functions were compared between the groups. Results: General cognitive function (t=-2.81, p=.011), frontal cognitive function (Z=-3.50, p<.001), attention/working memory function (U=-2.91, p=.004), depression (t=4.96, p<.001) of the experimental group were significantly increased than those of the control group. Conclusion: The findings of the study showed that an exercise-cognitive combined dual-task program for MCI was effective in improving general cognitive function, frontal and executive function, attention/working memory function, and reducing depression.

• 보험의학회지
• /
• 제27권2호
• /
• pp.96-106
• /
• 2008

다음은 위의 모든 결과를 바탕으로 디스크 질환의 입원기간이 길어지고 재발이 일어날 수 있는 나쁜 조건 (NEGATIVE)과 그 반대인 좋은 조건(Positive)을 table로 정리하였다. 좋은 조건은 같은 추간판 탈출 기왕력자라고 하더라도 예후에 긍정적인 가능성을 주는 조건이다. 따라서 심사할 때 table를 토대로 고지내용이 좋은 조건인지, 나쁜 조건인지 판단 할 수 있고 추가 질문사항을 요청하는데 도움이 될 수 있을 것이다. 만약 입원을 했더라도 며칠을 입원했는지. 재수술을 하였다면 어떻게 했는지, 직장인의 경우 현재 어떤 조건인지, 수술을 했다면 구체적으로 수술명이 무엇인지, 수술 후 술, 담배를 하였는지, 수술 후 현재 상태가 어떤지에 따라 인수 여부를 결정하는데 도움이 될 것이라고 생각한다.

• 대한가정학회지
• /
• 제42권2호
• /
• pp.19-32
• /
• 2004

Not only consumers but also corporations need to use and develop sustainable consumption for environmental preservation these days. This research studied the level of environmental consciousness, knowledge of environmental problems and consumption behavior for environmentally sustainable home electrical goods. This study was conducted by survey method and the sample was 300 housewives aged 20-50 living in Seoul and urban areas in 2003. The consciousness for the environment and seriousness of theenvironmental problems were very high. Nevertheless, the level of consumption behavior for environmentally sustainable goods was lower than the consciousness. Of the total sample, 33% were aware of the ultrasonic-waves-sink, 73% of the non-detergent-wash machine, 50% of the vacuum-without-trash envelope, and only 17% of the micro-oven-zero air power. Over 50% of the sample wanted to buy these environmentally sustainable, home electrical goods, especially working housewives.