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최정화,정영옥,Choi Jeong Wha,Jeong Young Ok 한국의류학회 1990 한국의류학회지 Vol.14 No.4
Experiment I and II had done to develop the solar heat proof hat for field work in the summer. In the experiment I physical characteristics of several fabrics was tested to determine which one Is proper to make the solar heat proof hat. On the base of above results in the experiment II three improved solar heat proof hat was deviced and tested solar heat proof effect and compared the existing summer working hat by wearing trials in the environmental chamber. The results obtained were as follows. 1. In the view of the physical characteristics of six fabrics (Blue T/C, White poplin, Vapor transfer silver coating nylon taffeta, No vapor trans(or silver coating nylon taffeta, Aluminum coating T/C, Microporous fabric), the light color T/C and no vapor transfer silver coating nylon ta(feta is proper to make improved solar heat proof working hat. 2. Three improved hats that are made of white T/C, grey T/C and no vapor transfer silver coating nylon taffeta have more solar heat proof effect than the existing summer working hat. 3. Among the three improved hats, the improved hat that is made of no vapor transfer silver coating nylon taffeta is most effective to proof the solar heat.
최정화(Jeong-Wha Choi),박준희(Joon-Hee Park) 한국생활환경학회 2007 한국생활환경학회지 Vol.14 No.2
Construction workers have been working with loss of efficiency and threatening their health for heat stress in summer. Nevertheless, work clothes for them have not been developed yet in terms of alleviation of heat stress. So, to solve this problem, it was worked out some clothing and evaluated their effects on physiological responses and subjective sensation using following two steps: climatic chamber test and field test. 4 healthy men in climatic chamber test and 3 workers in construction field test participated. The results were as follows. First, in the climatic chamber, Tsk increase was the highest in control, Tre increase was high in A, B and C and Tb increase was the highest in B. Heart rate was the lowest in B (p<.05) and weight loss and heat storage were the lowest in D. Second, in field test, most of physiological responses were lower in D-2 than in control such as skin temperature, clothing microclimate and heart rate (p=.000). Subjective sensations were also reported as cooler and more comfortable in D-2 than in control. The results showed that a new work clothes (D and D-2) is efficient for reducing heat stress. However, further study should be performed about safety and durability of work clothes because this study is attempted to alleviate heat stress in terms of thermal comfort.
외출할 때와 집 안에서 한국 성인여성의 계절별 착의 실태
최정화(Jeong-Wha Choi),이주영(Joo-Young Lee),고은숙(Eun-Sook Ko),이효현(Hyo-Hyun Lee),김재영(Jae-Young Kim) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1
The purpose of this study was to examine Korean women's wearing conditions in their daily lives, to gain basic data concerning clothing insulation. We investigated the women's layering of clothing and actual wear state through one-on-one interviews and questionnaires. The respondents were restricted to adult women who lived in Seoul and Gyeonggi province (N=825; January 2005~August 2005). The results of this study showed that Korean women wore, on average, four upper layers and two lower layers outdoors in winter; three upper layers and two lower layers outdoors in spring; and two upper layers and two lower layers outdoors in summer. The clothing layers showed a significant difference by season (p<0.05). In home, women wore two upper layers and two lower layers, without any significant difference by season. In winter, women who wore a lot outdoors also wore a lot home (r=0.263, p<0.05). Women over 60yrs wore more than young women, in both winter and summer (p<0.05). In winter, the percentage of women wearing long johns (underwear with long sleeves and long legged) outdoors was 7%, and older wore long johns more often than young women. Outdoors, socks (or stockings) were worn 100% of the time in winter, 90% in spring, and 27% in summer. In home, socks were worn 38%, 21%, and 5% in winter, spring and summer, respectively. In conclusion, season affected the layering of clothing outdoors but not home. Furthermore, the age was a major factor affecting the layering and type of clothing both outdoors and home.
최정화(Jeong-Wha Choi),김재영(Jae-Young Kim),김도희(Do-Hee Kim) 한국생활환경학회 2005 한국생활환경학회지 Vol.12 No.1
Appropriate bedding and nightclothes are important for our healthful sleeping. This study was made out from the responded questionnaire from the Korean cities and rural communities from the autumn of 2003 to the summer of 2004. The results were as follows: The number of bedding was bigger in the rural areas. The washing and sunbathing frequencies were more in the rural area. Regarding bedding colors, the percentage of whitish color is high in cities and that of reddish color is high in rural areas. Regarding disposal of bedding, the percentage of wasting with other trashes is high in cities and that of burning up is high in rural areas. Regarding the type of nightclothes, the percentage of wearing ordinary clothes and inner wear is higher than that of wearing ready-made nightclothes. Women, youngsters, and married persons wear ready-made nightclothes than men, old persons, and single persons.
최정화(Jeong-Wha Choi),고은숙(Eun-Sook Ko) 한국생활환경학회 2005 한국생활환경학회지 Vol.12 No.2
This study was performed to understand on the bedclimate of Koreans. Sixty two healthy adults (33 the urban and 29 the rural) participated in this experiments as subjects. As the result, the average sleeping hours were longer in winter and autumn than in spring and summer. Bedroom temperature was affected by outdoor temperature by the seasons. Bedroom temperature was higher in urban places than in rural places, but bedroom humidity was lower in urban places than in rural places. The subject slept in the condition which the air temperature and the relative humidity of the bedroom were 18.9~26.9℃, 47~74% for a year. The temperature of floor surface was the highest in summer. Both the differences of the bedclimate and those of clothing microclimate were significant by season and region. The differences of thermal sensation on bedroom temperature which the subjects felt was not significant by season and region. But the subjects felt more humid in summer and more comfortable in autumn.
여름철 비닐 하우스 오이 수확 농민의 작업 부담 및 온열 환경 평가
최정화(Jeong-Wha Choi),김명주(Myung-Ju Kim),이주영(Joo-Young Lee) 한국생활환경학회 2002 한국생활환경학회지 Vol.9 No.3
Physiological and subjective responses and work postures of the farmers and thermal environment during cucumber harvest in the greenhouse were investigated to evaluate the thermal environments and farmers' workload. Five career farmers (1 female, 4 males) volunteered as subjects. Farmers' work was monitored continuously for two days without any disturbance. The results were as follows. 1) Air temperature (Ta), air humidity (Ha), globe temperature (Tg) and WBGT for two days were mean 29~32℃, 70~81%RH, 30.3~44.5℃ and 27.6~32.9℃, respectively. By the WBGT, we evaluated that the thermal environment in the greenhouse gave a thermal burden to farmers. 2) The range of total work time was 161~298 minutes. The percentage of the work postures during the cucumber harvest was larger in order of sitting, standing and walking. 3) Rectal temperature (Tre) and mean skin temperature (Tsk) were 37.2(± 0.3)℃ and 33.2(±0.9)℃. Clothing microclimate temperature (Tel) on the chest and the back were 32.0(±0.8)℃ and 34.3(± 1.5)℃ (p < 0.(01). Clothing microclimate humidity (Hcl) was over 75%RH. Heart rate (HR) was 92(± 13) bpm and energy expenditure was 210(±43) kcal/hr. We evaluated that the harvesting cucumbers in the greenhouse was 'moderate work' by the physiological responses. 4) Average subjective responses of the farmers were 'somewhat hard", 'hot', 'very humid' and 'a little uncomfortable'. It is suggested that administrators should be concerned about the development and supply of portable cooling equipment as well as the improvements of working environment to alleviate farmers' heat strain and work load in summer.