• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2005년도 제25회 추계학술대회논문집
• /
• pp.266-271
• /
• 2005

과산화수소를 단일추진제로 사용하는 마이크로 추력기를 위한 실험적 연구를 수행하였다. 연구에서 은촉매 활성화 방법과 촉매 반응 챔버의 성능평가에 관한 실험을 하였다. 활성화를 위해 수소 환원법을 실시하였으며 $500^{\circ}C$의 환원 온도의 경우 가장 좋은 반응성을 가짐을 확인하였다. 촉매 분해 반응 연구를 위해 촉매 반응기가 제작되었다. 촉매 베드를 위해 지지체로 20 mm 길이의 유리 웨이퍼를 준비하여 은촉매를 스퍼터링 하였다. 추진제의 체류시간, 촉매 베드 온도, 촉매 코팅 면적을 변화시키며 추진제 전환율을 측정하였다.

• 상하수도학회지
• /
• 제14권1호
• /
• pp.108-116
• /
• 2000

Chlorine is widely used as a disinfectant in drinking-water systems throughout the world. Chlorine residual was used as an indicator for prediction of water quality in water distribution systems. The variation of chlorine residual in drinking water distribution systems of Suwon city was simulated using EPANET. EPANET is a computerized simulation model which predicts the dynamic hydraulic and water quality behavior within a water distribution system operating over an extended time period. Sampling and analysis were performed to calibrated the computer model in 1999 (Aug. Summer). Water quality variables used in simulations are temperature, roughness coefficient, pipe diameter, pipe length, water demand, velocity and so on. Extended water residence time affected water quality due to the extended reaction time in some areas. All area showed the higher concentration of chlorine residual than 0.2mg/l(standard). So it can be concluded that any area in Suwon city is not in biological regrowth problem. Rechlorination turned out to be an useful method for uniform concentration of free chlorine residual in distribution system. The cost of disinfectant could be saved remarkably by cutting down the initial chlorine concentration to the level which guarantees minimum concentration (0.2mg/l) throughout the distribution system.

• 가정과삶의질연구
• /
• 제17권4호
• /
• pp.221-238
• /
• 1999

South and North Korean societies have been segregated during the past 50 years with different socioeconomic conditions and ideologies resulting in disparate living cultures even though sharing the same traditional culture. The purpose of this study was intended to examine the housing life situations of North Koreans their housing behaviors and their perceptions of differences between South and North Korean culture. The study was based on in-depth interviews and an tempirical survey with North Korean defectors. The interviews were conducted with ten defectors and the empirical survey was done with 158 North Koreans who escaped after 1990. This study revealed housing life situations such as housing type. length of residence housing layout finishing materials levels of housing facilities and the residential system. It also revealed housing dissatisfaction and housing behaviors while they were living in North Korea and attempted to discover the defectors' perceptions of the differ nces between their housing life in the South and North. The findings of this research will present a realistic and recent account of the housing situation in North Korea. We hope that the result of this study will serve to foster understanding between two Koreas.

• 대한영양사협회학술지
• /
• 제24권1호
• /
• pp.75-91
• /
• 2018

The purpose of this study was to investigate changes in dietary life, lifestyle factors, and stress status of Chinese students who came to study abroad to South Korea. A total of 143 Chinese students were recruited from Seoul Women's University and Wonkwang University in 2013. We used SPSS 20 for statistical analyses in this study. The mean length of residence was 2.9 years for Chinese students. Most subjects aged 20~29 years immigrated to South Korea to obtain an academic degree (bachelor, master, or doctorate). We found a significant decrease in the frequency of eating fruits and vegetables among Chinese students in South Korea after migration. Further, there was a significant increase in fast food consumption and frequency of late-night snacking and eating out. In addition, their preferred beverage changed from soft drink or tea to coffee after migration. Stress level significantly (P<0.05) increased in male students compared to female students. The high stress group watched more TV when eating compared to the low stress group. In addition, there were more students who perceived their health status as bad in the high stress group. Overall results give us useful information for targeting the most vulnerable subjects and planning nutrition intervention programs.

• 농촌지도와개발
• /
• 제8권2호
• /
• pp.201-208
• /
• 2001

The purpose of this study was to review the current studies on community attachment and its related variables to suggest directions for community attachment studies in Korea. Specific objectives of the study were to search the current studies on community attachment, to search for the significant variables related to community attachment, and to draw implications for community development in Korea. The major findings of the study were as follows; 1) Current studies on community attachment used individual characteristic variables such as length of residence in the community, age, size of population and density as major independent variables. 2) Studies on community attachment used community participation, social and cultural environment as major dependent variables, however, both independent variables and dependent variables were used interchangeably in many cases. 3) Recent studied on community attachment employed community economic and cultural variables, however, studies on community attachment in Korea was relatively limited in terms of quantity as well as quality. 4) Further research on community attachment should be conducted by utilizing various independent and dependent variables in various communities to increase the community attachment in rural and urban communities to further strengthen community development in Korea.

• 한국연소학회지
• /
• 제13권1호
• /
• pp.1-9
• /
• 2008

Emission characteristics of NOx and CO with heat loss under high efficiency combustion conditions of $CH_4$/Air prmixed flame were examined numerically using detailed-kinetic chemistry. The one-dimensional combustor length was fixed 5cm, and the equivalence ratio was varied from 0.75 to 0.95. To consider the effects of heat loss on NOx and CO formation, the radiative heat loss rate and combined heat loss rate of conductive and convective heat transfer are included. The following conclusions were drawn. In order to reduce the NOx and CO emission level simultaneously, the temperature of product gases must be reduced under 1,800K as soon as possible but kept over 1,300K during the residence time which is needed to converge CO to $CO_2$.

• 한국주거학회논문집
• /
• 제26권5호
• /
• pp.37-44
• /
• 2015

The purpose of this study was to compare urban and rural seniors' perceptions on the eight aspects of the World Health Organization Age-Friendly Cities (AFC) initiative on Jeju Island, South Korea. Face-to-face interviews using structured questionnaires were administered to 497 persons aged 65+ living on Jeju Island. Findings suggested that urban and rural held significantly different perceptions on five aspects of AFC (outdoor space and buildings, housing, civic participation and employment, community support and health services, and respect and social inclusion). Predictors of overall AFC score for all participants included age and living in a single-family home. Among urban dwellers, monthly household income and length of residence predicted AFC score while among rural seniors, predictors of AFC included educational attainment. To make communities more age-friendly, perspectives of older residents should be sought, shared, and reflected in policy and different strategies and priorities should be developed specific to urban and rural areas.

• 여성건강간호학회지
• /
• 제19권4호
• /
• pp.254-264
• /
• 2013

Purpose: The purpose of this study was to identify the factors influencing depression of married immigrant women in Korea. Methods: Participants included 127 married immigrant women who met eligibility criteria and agreed to participate in the study. Participants were evaluated for subjective assessment of married immigrant-related constructs using a self-report questionnaire, for depression, acculturation stress, and social support. The analysis was done using SPSS for Windows, version 18.0, and included stepwise regression. Results: The major findings were as follows; 1) Depression significantly differed according to native country, length of residence in Korea, education, family monthly income, household and primary support. 2) There were significant relationships between marital life satisfaction (r=-.80, p<.001), acculturative stress (r=.78, p<.001), and social support (r=-.20, p=.025). 3) Marital life satisfaction, family monthly income, acculturative stress, primary support and social support were significant factors, which explained 84.6% of the variance in depression (F=138.04, p<.001). Multiple regression analysis revealed that a powerful predictor of depression for married immigrant women was marital life satisfaction. Conclusion: Based upon the findings, this study provides useful information that could assist in reducing depression among married immigrant women, and indicates that nursing interventions are needed.

• KIEAE Journal
• /
• 제14권1호
• /
• pp.5-13
• /
• 2014

The ancestors of China created various proper dwellings in the vast Chinese lands, according to distinct geographical environment, climate, and special local products. The purpose of this study is to compare features of 7 typical traditional Chinese dwellings in different areas from historical, geographical, structural and tinctorial aspects, in order to see what the differences are and rearrange them by these 4 different scales as estimate standards. By Comparing features between 7 traditional dwellings, advantages and disadvantages of them were found out. Not only natural terrain but also cultural mentality is an important factor that effected on the changes of regionality. The result showed that historical length in a certain extent reflected the differences between dwellings in different areas; there are more regular type dwellings in the northern China; dwellings in different structural material types following their regions; and, southern dwellings prefer natural and simple exterior colors. Also From construction aesthetics and culture perspective, Different cultures have cultivated and brought out different dwelling styles. Thus, protecting on traditional dwellings is of great necessities and this study will bring benefits in many aspects. For a further research, the result of this study can be utilized as the base data that suggest directions for effective Chinese residence planning in different areas meeting different demands.

• 가족자원경영과 정책
• /
• 제15권1호
• /
• pp.51-70
• /
• 2011

This study is to explore the effects of leisure life on multi-cultural family from a view of marriage migrants women. For this purpose, data were collected by in-depth interviews of 24 marriage migrants women who came from 7 countries such as Vietnam, China, Japan etc. They are living in Daejeon city, Okcheon gun(Chungbuk), Gumi city(Gyungbuk) and the length of residence is ranging from 4 and half month to 13 years and 6 months. Data were analyzed by qualitative method. Major findings are as follows: First, individual and family leisure of marriage migrant women had positive effects on adaptation of her family life. Especially, in the early marriage stage, family leisure contributed women's emotional stability. Second, time was the most limiting constraints in family leisure of multi-cultural family. Third, early in the marriage, marriage migrant women who is not fluent in Korean language, customs, and courtesy hinders them from joining their family leisure. Fourth, leisure may seem to contribute to family life satisfaction, but marital relationships and household economy has to be settled beforehand.