• Journal of the Society of Cosmetic Scientists of Korea
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• v.40 no.4
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• pp.403-412
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• 2014

To develop an effective skin whitening agent for cosmetics, we isolated cucurbitacin B from Cucumis sativus L. which has been used as traditional skin lighting regimen by the bioactivity-guided fractionation, and investigated the inhibitory effects of cucurbitacin B on melanogenesis. At a non-cytotoxic concentration, cucurbitacin B reduced melanin contents of B16F1 melanoma cells in a dose-dependent manner. Cucurbitacin B did not directly inhibit mushroom tyrosinase activity, but it inhibited intracellular tyrosinase activity in a dose-dependent manner. Its inhibitory mechanism on melanin biosynthesis was further assessed, and we found that cucurbitacin B significantly decreased the protein level of tyrosinase, a major melanogenic enzymes and MITF, a master transcriptional factor of melanogenesis. In addition, cucurbitacin B increased the expression of WW domain-containing oxidoreductase (WWOX) which is known to function as tumor repressor and inhibits $Wnt/{\beta}$-catenin pathway. Collectively, these results suggest that cucuritacin B from C. sativus could be used as an active ingredient for skin whitening.

• Journal of the Korean Society of Food Culture
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• v.35 no.4
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• pp.342-350
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• 2020

This study examined the methods used in household doenjang (Korean soybean paste) production. Nine hundred forty-three responses were obtained using a nationwide, questionnaire-based survey (2018-2019) with non-probabilistic snowballing sampling. Consistent with previous studies, the respondents were primarily over the age of 50 years (97.1%) and female (97.9%). In addition to soybeans, the most used ingredients were red pepper (85.8%) and charcoal (85.5%), which most respondents obtained through direct farming (50.4-59.9%). Seasonal production occurred later in the higher latitude regions (Gyeonggi-do, Gangwon-do, Chungcheong-do) (p < 0.01), which have lower average temperatures, and the fermentation period was shorter in the lower latitude regions (Jeolla-do, Gyeongsang-do, Jeju-do) (p < 0.01), which have higher average temperatures. There were no significant regional differences in the season when doenjang was made, with most production occurring during January and February (81.1%). Most respondents (71.3%) made doenjang using homemade meju (soybean block used as a starter) in a traditional way to allow the microorganisms to be naturally inoculated. These results could be used as a basis for future research on topics such as starter development, standardized production, and safety of household doenjang.

• Journal of the Korean housing association
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• v.25 no.1
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• pp.51-61
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• 2014

The purpose of this study was to explore housing characteristics of young single- or two-person households in the U.S. metropolitan urban areas and determinants of their housing cost burden. Total 764 single-person households, 744 two-person households and 424 households with three or more persons were selected from the 2011 American Housing Survey public-use microdata for the study based on specific sampling criteria. The major findings are as follows: (1) In comparisons with larger households, single- or two-person households were characterized to be headed by younger householders, to have less income, and to have a greater proportion of households living in central cities of metropolitan areas, renting housing units, living in smaller size units or multifamily structures; (3) housing cost of single- or two-person households were significantly less than a larger households while housing costs per unit square footage (SQFT) of single- or two-person households was significantly greater; (4) regardless of the household size, there are many household headed by young college graduates paying too much of their income for housing, and single-person households were found to have the greatest housing cost burden; and (5) a linear combination of low-income status, monthly housing costs per unit SQFT, annual household income, and unit SQFT per person was found to be most efficient to predict single- or two-person households with housing cost burden.

• Korean Journal of Community Nutrition
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• v.26 no.5
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• pp.337-349
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• 2021

Objectives: The purpose of this study was to analyse the relationship between eating behaviour and healthy dietary competency of single and multi-person households, to improve healthy eating behavior. Methods: This study was conducted on 6,355 adult household members who participated in the Food Consumption Behavior Survey 2020. The subjects were divided into age groups comprising young people in their 20s and 30s, middle-aged people in their 40s and 50s, and the elderly in their 60s and above. The eating behavior and healthy dietary competency of single-person and multi-person households were then analyzed. Results: The average age of the members in the single-person households was found to be higher. Single-person households were also found to have a lower marriage rate and lower monthly household income than multi-person households across the age groups of young, middle-aged, and elderly people (P < 0.05). Among each of the age groups, single-person households had significantly higher rates of skipping breakfast and eating breakfast, lunch, and dinner alone than multi-person households (P < 0.05). Young single-person households had lower average scores on healthy dietary competency than multi-person households (P = 0.032). When adjusted for age, gender, marriage, education, occupation, and household income, single-person households had a higher risk of delivery/take-out, eating out, or skipping meals compared to multi-person households (P < 0.05). In multi-person households, the risk of skipping meals, eating alone, eating out, or delivery/take-out decreased as healthy dietary competency improved (P < 0.05). On the other hand, in single-person households, as healthy dietary competency increased, the risk of delivery/take-out or eating alone decreased (P < 0.05). Conclusions: The results of this study suggest that healthy dietary competency and eating practices can be improved by providing customized dietary education by age group for single and multi-person households.

• Korean Journal of Exercise Nutrition
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• v.25 no.4
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• pp.1-9
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• 2021

[Purpose] This study analyzed data from the 7^th Korean National Health and Nutrition Examination Survey (2016-2018) to compare the differences in energy intake and physical activity (PA) levels in middle-aged Korean men aged 40-59 years according to household type and the presence of metabolic syndrome (MetS). [Methods] Data from 2,266 young adults (aged >39 years and <60 years) were obtained from the KNHANES. We analyzed the differences in energy intake and PA levels according to household type and MetS. The presence or absence of MetS was determined by measuring waist circumference, blood pressure, fasting blood glucose, triglyceride, and HDL-C levels. [Results] Regarding total nutritional intake, no relationship with MetS was observed regardless of household type (interaction between MetS and household type: p = 0.875). No differences in total PA were observed between multiple- and single-person households (interaction between MetS and household type: p = 0.122). The relationship between MetS and MetS components according to nutritional intake showed that participants with a higher energy intake had a 27% lower prevalence of low high-density lipoprotein cholesterol (HDL-C) (p < 0.05) and a 36% higher prevalence of high blood pressure (p < 0.01). The relationship between MetS and MetS components according to the PA level showed significantly reduced prevalence of MetS by approximately 39%, 35%, and 43% (p < 0.01, 0.01, and 0.001) in subjects who were somewhat active, active, and very active, respectively, compared to inactivity. [Conclusion] Middle-aged men showed no difference in nutritional intake and PA between multiple- and single-person households. However, the risk of MetS was significantly higher in participants with approximately 1.5 times the energy intake compared to the group with the lowest energy intake. Moreover, higher levels of PA had a marked positive effect on the risk factors and prevalence of MetS. Therefore, we suggest that reducing the total energy intake and increasing total PA are important for preventing MetS in middle-aged men regardless of household type.

• Science of Emotion and Sensibility
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• v.26 no.1
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• pp.3-16
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• 2023

This study investigated how COVID-19 imparted the fashion expenditure of households in Korea. During the COVID-19 pandemic, the ratio of fashion expenditure to household income and the ratio of fashion expenditure to household consumption expenditure were estimated using secondary data of national statistics. The household income and expenditure data in Korea were extracted from 2018 to 2021. The household was categorized by generations such as gen Z, gen M, gen X, Baby Boomer, and Silent generation, and the household income status was identified by the income quintile. The outcome revealed that the ratio of fashion usage expenditure to income decreased following COVID-19 equated to before COVID-19 and revealed the significant differences by income quintile. The ratio of fashion consumption to household expenditure significantly differed between the pre-COVID-19 and the post-COVID-19. The difference in the ratio of fashion consumption to household expenditure was important by generations, and it was not affirmed by the income quintile.

• International Journal of Human Ecology
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• v.15 no.2
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• pp.93-104
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• 2014

This study examined housing costs and housing affordability of young college graduate renters in the Capital Region of Korea using microdata of the 2012 Korea Housing Survey (KHS). A licensed microdata set of 2012 KHS was obtained on September 29, 2012 from the official KHS Website and analyzed statistically. I selected 93,795 young college graduate renters between 20 and 29 years of age in the Capital Region and compared their housing costs across income levels and tenure type. Major findings were as follows: (1) Jeon-se deposit was on average 3.1 times the annual household income and monthly renters' deposit was 7.1 times the monthly household income; (2) households in higher income groups tended to pay a larger deposit and/or monthly rent; however, households with a lower income were found to pay a greater proportion of income to housing costs than households with a relatively higher income; (3) a total of 64% of all young college graduate renters had housing cost burdens to pay 30% or more of their income for housing, and more than 78% of the low-income households were found burdened; and (4) after housing cost payments, low-income households had less than one million KRW left to spend on other needs and savings; in addition, some low-to mid-income households had zero or even minus income left after housing cost payments.

• Journal of Family Resource Management and Policy Review
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• v.20 no.1
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• pp.159-182
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• 2016

The purpose of this study was to investigate the relationship between household income, consumption wants for education, private education expenses, and old-age economic preparation behaviors in mothers with school-aged children. The participants in this study comprised 393 mothers living with children aged 8.19 in Daegu. All participants had wage-earning husbands. A questionnaire was used to collect the data. Factor analysis was conducted using SPSS and structural regression analysis was performed using AMOS. The main results of this study were as follows: The participants' old-age economic preparation behaviors were influenced by their household income, the proportion of private education expenditures they paid, and the perceived burden the participants had of these private education expenditures. The consumption wants for education in mothers with school-aged children had no significant impact on the proportion of private education expenditures paid by the participants. Household income, proportion of private education expenditures, and perceived burden of the private education expenditures had a direct effect on the old-age economic preparation behaviors of the participants. When the perceived burden of the private education expenditures was mediated, the consumption wants for education in mothers with school-aged children had an indirect effect on their old-age economic preparation behaviors.

• Applied Biological Chemistry
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• v.27
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• pp.3-17
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• 1984

Anaerobic digestion has recently attracted all over the world and Korea also shows no exception. The major benefits of anaerobic digestion are energy production, water pollution control, pathogen reduction and effective manure production. In Korea it was recognized in late sixties that there was a positive need to find alternative energy for farmers household. The main traditional energy sources in rural area were crop residues and forestry products. Therefore Office of Rural Development through its Rural Guidance Bureau disseminated about 29,000 household biogas units from 1969 to 1975 to provide cooking fuel for farmers household and to improve the mode of farmers living standards. The units were welcomed by farmers at that time. Now, however, most of them are not using due to a number of reasons associated with cold winter and some techno-economical problems (in those day, fossil fuel was quite expensive to compare with other prices and since then farmers income was quickly increased). The author studied on bag type household biogas plant to solve some technical problems of existing household biogas plants, but this also has little appeal for the farmers. From 1977 author studied on village scale biogas plant with two pilot plants. From the viewpoint of energy production, COD removal, kill rate of pathogen and fertilizer value, the results obtained from the experiments were quite promising, but the construction cost of the village scale biogas plant was too high for the farmers in Korea. To find most suitable biogas plant for farmers in Korea through the simplifying the biogas digester, the author developed batch-load biogas plant. By feeding coarse crop residues and manures, total solids concentrations of the batch-load biogas plant are about 28 percent which is much higher than continous digester of 5-8 percent. The batch-load biogas plant was welcomed by many farmers in Korea when it was reported on TV and newspapers. The plant was disseminated 154 units in 1982, 766 units in 1983 and 812 units in 1984 as a promissing project. Besides these biogas plant experiments, studies were also conducted 1) to determine gas production rate with agricultural wastes, 2) to evaluate the effect of loading rate, dilution, retention time on biogas production, 3) to project the amount of potencial energy from agricultural wastes.

• Journal of Families and Better Life
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• v.23 no.6 s.78
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• pp.67-77
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• 2005

The purpose of this study was to evaluate the accessibility of existing multi-household multi-studio type house for developing Senior Congregate Housing. At present, in Korea, 'the Act of Promotion of Convenience and SEcurity for Disabled, Aged, Expectant Mothers, etc.' is applied to only public facilities. Therefore, this study evaluated 7 units -2 multi-household house and i multi-studio type house- in order to grasp the problems caused if the aged would dwell in that type of house, by the items of 'manual for improving the residency of the disabled' which was stipulated by the act above. The data was collected from May to June, 2005. The results were as follows: Firstly, the main entrances, exits and width of stairways had narrow spaces, the handles and bars did not conform with the terms presented in the manual above. Front doors should be opened like a bay for wheelchair use. Secondly, additional lighting apparatus and furniture should be added properly Thirdly, there were several inconformity to the manual for bathroom: improper handles, inadjustable washing-stands, unavailable spaces in front of toilet bowls, and out-of-place showers and taps. Finally kitchen cabinet design improper for wheelchair user. In conclusion, accessibility of existing multi-household or multi-studio type house was not good enough for the aged reside in. Those insufficiencies suggest that more specified standards to enhance accessibility to develop senior congregate housing should be added.