• 상하수도학회지
• /
• 제19권3호
• /
• pp.348-356
• /
• 2005

Water quality sampling surveys and continuous measurement of flow were conducted to identify wastewater flow characteristics for representative catchment of O and M treatment basins in A city. For HS-1 station representing commercial area, wastewater flow rises in the beginning of office-working hours, moves up and down within narrow range, and lasts till office-leaving hour, and falls gradually reflecting worker's returning home. However, in HS-2 station representing residential area, wastewater flow has two peaks, which are before office-going hour and after office-leaving hour. In residential area, the flow rate of weekends is higher than that of weekdays because it reflects population, being not contributed to generate wastewater during the working hours of weekdays, stay home and produce wastewater for weekends period. To determine the priority for rehabilitation of sewer system, infiltration rate was computed by dividing infiltration flow by mean diameter and total length of sewer, and HS-1 station ranked the first.

• Safety and Health at Work
• /
• 제12권1호
• /
• pp.96-101
• /
• 2021

Background: Many studies have reported noticeable increases in the proportion of employees working either relatively short or relatively long hours. Such trends have been accompanied by an increasing concern regarding work hour mismatches defined as a discrepancy between actual and preferred work hours. The aim of this study was to investigate association between work hour mismatch and depression. Methods: Data regarding work hour mismatches for 47,551 adults were extracted from the 2017 Korean Working Conditions Survey. The World Health Organization-Five Well-Being Index was used to measure depression. Multiple logistic regression analyses were performed to examine the association between work hour mismatch and depression. Results: Men and women workers with work hour mismatch were more likely to have depression [underemployed males: odds ratio (OR) = 1.30, 95% confidence interval (CI) = 1.14-1.49, overemployed males: OR = 1.28, 95% CI = 1.18-1.40; underemployed females: OR = 1.37, 95% CI = 1.20-1.56, overemployed females: OR = 1.12, 95% CI = 1.02-1.23]. Underemployed workers, workers who worked more than 52 hours per week, and workers with a high income level, all had higher ORs for depression. The greater the discrepancy between actual and preferred work hours, the higher OR for depression among both underemployed and overemployed workers. Conclusions: A difference between actual and preferred work hours was associated with depression. Underemployed workers had a higher risk of depression than that of overemployed workers. As a work hour mismatch negatively affected workers' mental health, it is important to reduce work hours mismatches as well as shorten the absolute number of work hours.

• 한국항만경제학회지
• /
• 제34권4호
• /
• pp.85-104
• /
• 2018

본 연구는 부산항 항만하역근로자들의 근무환경에 대한 인식이 어떠한지 요인별로 파악하고, 직무만족과 조직몰입에 미치는 영향을 규명하는데 그 목적을 두고 있다. 연구의 대상은 부산항에 근무하고 있는 항만하역근로자들 중 부산항운노동조합 소속 부두조합원들을 대상으로 한정하였으며, 설문지는 부산항 북항과 신항을 대표하는 신선대 터미널, PNC 터미널 등을 직접 방문을 통하여 회수하였다. 가설의 검증결과 교육복지, 직무태도, 동료관계, 인사제도, 고용안정 등은 조직몰입에 유의미한 정의 영향을 미치는 것으로 나타났으며, 교육복지, 직무태도, 동료관계, 인사제도, 업무시간 등은 직무만족에 유의미한 정의 영향을 미치는 것으로 나타났다. 특히 임금이 조직몰입이나 직무만족에 유의미한 영향을 미치지 않는 부분은 기존 선행연구와 다른 점으로 갱단위로 작업하는 항만하역작업의 특수성이 반영된 결과로 볼 수 있다. 항만하역 산업이 인력의존도가 높고 작업반을 단위로 하는 협업이며 따라서 직무태도나 동료관계 등의 요인이 중요한 산업임에 따라 본 연구의 결과는 항만하역 산업 발전전략의 기초자료로 활용될 수 있을 것으로 사료된다.

• 보건교육건강증진학회지
• /
• 제31권3호
• /
• pp.51-61
• /
• 2014

Objectives: The purpose of this study was to identify the effects of job characteristics on smoking, and the mediating effects of job stress between job characteristics and smoking among elderly workers. Methods: This study employed data from the Korean Longitudinal Study of Ageing, and a total of 778 older workers were used for analysis. Current smoking status, job stress, job characteristics including physical job demands, job demands related to contents, working days, regularity of working hour, satisfaction with income, and sociodemographic factors were analyzed. Descriptive analysis, t-tests, chi-square test, multiple linear regression, and logistic regression were used for analysis. Results: Results showed that physical job demands and regularity of working hours were significant predictors of smoking of elderly workers. The higher level of physical job demands and regular working-hour increased the risk of smoking. Also, physical job demands, job demands related job contents, and income satisfaction directly impacted on job stress. However, job stress did not mediate the relationship between job characteristics and smoking. Conclusions: The findings suggest that smoking interventions for older workers should take into account job characteristics. Implications for practice and future study directions are discussed.

• 대한치과기공학회지
• /
• 제11권1호
• /
• pp.47-63
• /
• 1989

The study was made to clarify the degree of fatigue of dental technicians in service at the general &local hospital or the dental laboratories in the large cith of korea. The objectives of this study were 235 dental technicians who replied the questionaire which was sent by postal service out of 600 dental technicians selected by random sampling among the workers of the each dental laboratory. The instruments used in this study was the same one as developed by Industry Fatigue committee of Japan Industry Hygiene Association. This instrument was included total 30 items which is consisted of 10 perceived symptoms of fatigue in physical, mental and neuro-sensory dimension respectably. Reliability was tasted with the data of objectives, in which value of Cronbach's $\alpha$ was 9457. The following results were obtained. 1. It was revealed that the influencing demographic variables on the perceived symptoms of fatigue of dental technicians were sex, age, marital status, educational background, job carrier, working part, working hour and commuting hour. The shorted the age or job carrier, thge higher dearee of the perceived symptoms of fatigue. The longer working hours of commuting hours, the higher degree of the perceived symptoms of fatigue. The degree of the perceived symptoms of fatigue in females, unmarried person, the one with higher educational background, workers except orthodontic appliances and poorcelain contouring were higher than the other group. 2. The higher degree of the rest & leisure condition, the lower degree of the physical, mental and neuro-sensory perceived symptoms. 3. The higher degree of environmental condition of the working, the lower degree of the physical, mental and neurosensory perceived symptoms.

• 지역사회간호학회지
• /
• 제18권2호
• /
• pp.276-283
• /
• 2007

Purpose: This present study has been conducted on female workers' shorter working hours in order to look into their fatigue level and the correlation between fatigue and working hours. Method: We surveyed 237 respondents using a questionnaire from June 1st to June 20th, 2005. Results: The means of total fatigue complaint was 3.45. The fatigue level was significantly higher in the lower age group, unmarried group, manager group and shorter working duration group. And the fatigue level was significantly correlated to working hours and work intensity. In the results of stepwise multiple regression, factors affecting the fatigue level were the change of work intensity, age, regular diet habit, working hours and the type of occupation. Conclusion: It is necessary to prepare the health promotion programs, which can reduce female workers' fatigue level and relieve the intensity of their works.

• Asian-Australasian Journal of Animal Sciences
• /
• 제4권2호
• /
• pp.131-136
• /
• 1991

Four male swamp buffaloes weighing $460.5{\pm}44.6kg$ were used to study the effects of different cooling techniques on draught capacity. Each animal carted an 882 kg load on the same asphalt road for one hour during four different time periods: 9:00-10:00 A.M., 10:30-11:30 A.M., 2:00-3:00 P.M. and 3:30-4:30 P.M. Simultaneously, all animals were subjected to five different treatments on five days of similar environmental conditions. In Treatment 1, animals were put stationary in a field and did no work; in Treatment 2, animals were worked without any cooling method; in Treatment 3, fifteen-minute wallow was allowed to animals prior to working; in Treatment 4, animals were covered with wetted jute bags while working, and in Treatment 5, two buckets of water were poured over the buffaloes' trunks just prior to working. The experiment was conducted from April to July 1989, when the weather was very hot. It was found that cooling methods and working times did not affect the draught efficiency of buffaloes during the one hour, but did affect physiological traits. The work load had a larger partial effect on physiological responses of buffalo other than respiration rate than did climatic variables except on the respiration rate of the buffaloes. One cooling technique that seemed to slow the increase of body temperature while working was covering the buffalo's back with wetted jute bags. Animals working at different times had significant differences in the increase of physiological traits except pulse rate.

• 대한가정학회지
• /
• 제48권9호
• /
• pp.79-87
• /
• 2010

The purpose of this study was to investigate whether employed mothers' extended working hours have effects on childcare style and work-family conflicts. The data came from the 2007 Korean Longitudinal Survey of Women and Family(KLoWF) of the Korean Women's Development Institute. 475 females with preschoolers or elementary-school children were used in this study. The major findings can be summarized as follows: (1) Weekly average working hours varied by education, salary, and the presence of preschoolers. (2) The time of childcare was significantly shorter in mothers who work more than 50 hours/week (3) Mothers who worked more than 50 hours/week felt significantly high work-family conflict. These analyses pointed to the importance of obeying the law related to working hours as the most important thing to sustain work-family balance. Institutional foundations should be enabled to keep legal working hours.

• 한국농업기계학회:학술대회논문집
• /
• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
• /
• pp.488-499
• /
• 1996

A propeller type mistblower was designed and manufactured. The machine consisted of a 770 millimeters diameter propeller driven by the power take off of a tractor. It delivered 26,400 cubic meters of air per hour and has the outlet speed about 180 kilometers per hour. Spray liquid was injected at 30 bars pressure through hollow cone type nozzles which were located around the air outlet of the machine bya poston type pump. Power consumption of the machine was found to be 12.46 kilowatts and the effective forward travel speed was about 2.7 kilometers per hour. Upon spraying mango trees, it was shown that the density of spray partices was about 100 microns and consumed 3.12 liters per tree. Working speed in 6 meters row spacing mango orchard was about one hectare per hour.

• 건축사
• /
• 통권648호
• /
• pp.119-121
• /
• 2023