• Journal of the Korean Home Economics Association
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• v.26 no.1
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• pp.109-122
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• 1988

This study attempts to analyse the food consumption expenditure patterns of wage-Earner's Households n terms of the changes in income during 1975∼1985. For the purpose of these time-series analysis and cross-section analysis, household survey data 'Annual Report on the Family Income and Expenditure Survey'- was used. The main results can be summarized as follows : 1. The proportion of the food expenditures has decreased with the increased of income in the city families during 1975∼1985. The Income-Elasticity and limit spending habits has decreased with the increase of income in the city families during 1975∼1985. 2. Analyzing the structure of the food consumption of each income class, the results reflected the Engel's law. That is to say, the higher income was, the more absolute expense for food was, but the rate of it was.

• Journal of the Korean housing association
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• v.11 no.2
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• pp.51-62
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• 2000

Despite the massive housing production since the 1990's, housing affordability of rental households has not been substantially improved. The objective of this study was to investigate housing consumption behavior of rental households. Numerous literatures pertaining to the subject were thoroughly reviewed. SPSS PC+ for window was used to analyze the data collected to Korea Research Institute for Human Settlements(KRIHS) in 1999. The major findings are highlited as follows: The results shows a statistically significant difference in housing consumption behavior according to household income, the age of householder, number of family. And estimation of the willingness to pay revealed that low income families are influenced on the rental price and the income elasticity of demand is high.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.39 no.4
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• pp.281-288
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• 2013

Hyaluronic acid (HA) is one of the major extracellular matrix components in skin. The HA content is reported to decline with age, which may contribute to decrease in skin moisture, wrinkle formation and the decrease in elasticity of the skin. Among the family of HA synthase genes (HAS-1, 2, 3) identified so far, HAS-2 plays crucial roles in the regulation of HA synthesis in human skin fibroblasts. In this study, we elucidated the effects of ferulic acid isolated from Cnidium officinale on HA production. Semi-quantitative RT-PCR and quantitative real-time PCR showed that ferulic acid increased mRNA level of HAS-2 gene and ELISA assay also revealed that ferulic acid increased HA production in human skin fibroblasts. Our study suggests that ferulic acid might prevent age-dependent skin deteriorations such as wrinkles, dryness and elasticity decrease, all of which could be ascribed to the reduction of the HA content in human skin.

• Proceedings of the SCSK Conference
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• 2003.09a
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• pp.590-600
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• 2003

The matrix metalloproteinases (MMPs) are a family of enzymes responsible for degrading connective tissue. MMPs catalyze the breakdown of collagen from the extracellular matrix, leading to wrinkle formation and accelerated skin aging. Furthermore, ultraviolet irradiation causes increased expression of certain MMPs. In the extracellular matrix turnover, MMPs are interacting with endogenous regulators named tissue inhibitors of metalloproteinases (TIMPs). Using peptide substrate assays, it has been demonstrated that TIMP-MMP complexes interact highly specifically with $K_{i}$ values of 10$^{-9}$ -10$^{-16}$ M. Therefore applications for TIMP as inhibitor of collagen degradation are suggested for cosmetic anti-aging products to prevent wrinkle formation and loss of elasticity. To date four TIMP proteins (TIMP-1, TIMP-2, TIMP-3 and TIMP-4) have been identified which show a high degree in sequence similarity. The production of human TIMP-2, a 194-residue nonglycosylated protein, was performed by fed-batch culture of Escherichia coli. TIMP-2 accumulated in the bacterial cells in an insoluble form as inclusion bodies. The inclusion bodies were solubilized and the protein refolded to yield the native TIMP-2 in the active form. The integrity of the protein was confirmed by mass analysis, Edman sequencing and gel shift experiments with authentic samples. The inhibitory activity of the refolded and purified TIMP-2 was demonstrated with MMP-1 and MMP-2 assays using synthetic fluorogenic peptide substrates.s.

• Journal of the Korean Home Economics Association
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• v.44 no.6 s.220
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• pp.163-174
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• 2006

The purpose of this research was to examine the level and trends in household clothing expenditure in Korea. Raw data sets produced by the National Statistical Office from the Family Income and Expenditure Survey from 1991 to 2004 were used to support time-series and cross-sectional analyses. The clothing expenditures decreased severely and quickly during the economic crisis of late 1997 through 1998, then increased slowly after the economic crisis until 2003, only to slightly decrease again in 2004. The ratio of clothing expenditure to total household expenditure decreased from 8.03% in 1991 to 5.11% in 2004. This decrease in relative clothing expenditure was greater in the lower income group than in the middle and high income groups. Clothing expenditure patterns were unique and differed from other household expenditures. Although the economic crisis in the late 1990s affected Korean consumers' clothing expenditure, clothing expenditure patterns showed a more fundamental and structural change from 1991 to 2004, with the overall decrease in such expenditure resulting from the concurrent increase in educational and information-communication related expenditures. Clothing expenditure was shown to be luxurious through cross-sectional analysis, but necessary through time-series analysis.

• Human Ecology Research
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• v.53 no.3
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• pp.309-318
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• 2015

This study investigates to investigate the ageing effect on household demand for clothing, food, housing and medical care commodities in Korea using a demand system model. The cross-sectional and time-series data from Statistics Korea on urban household expenditures and age projection analyzed household demands of consumption commodities. The household head age and elderly population ratio were employed for proxy variables of ageing. Ageing variable elasticities of commodity demands were estimated. Study results show that ageing variables significantly influenced on a household demand for commodities; clothing and food consumption decreases; however, housing and medical care consumption increases with ageing. The elasticities of total consumption expenditures and price variables were estimated in the demand analysis; these two variables significantly impacted almost all of the household consumption for the studied commodities. This study provides an opportunity to examine how ageing influences household consumption for clothing, food, housing and medical care commodities as Korean society experiences a rapid ageing. It is also meaningful that this study conducted a quantitative measuring of the household demands for commodities that was different from past research on the household consumption expenditures for commodities.

• Korean Institute of Interior Design Journal
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• v.15 no.3 s.56
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• pp.24-32
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• 2006

Through the increasing of social economies and cultural activities, the Food service industry have been growing up steadily in spite of low economic activity. This is owing to increasing income, participation of women in public affairs and a dual-income family, automobile culture, desire for healthful food, shorten working hours, changing of cultural style. Moreover, the recent importance of Interior finishing materials by means of fire in the Restaurant, legal fractional multiple use business establishment are recognized of publicity. Therefore, This Study aim object at probing into the characteristic of Interior finishing material and then analysing the characteristics of space and material according to the typical distribution. In the Interior planning of Restaurant, firstly it is need to probe the Characteristics of interior finishing material at the basic element. This study is going to apprehend the constitution of space and difference of proportion or a point of sameness in the characteristics of material. Moreover, the recent importance of Interior finishing materials by means of fire in the Restaurant, legal fractional multiple use business establishment are recognized of publicity. Throughout probe and analysing, it can append more efficiency and elasticity in the usage of interior finishing material.

• Applied Microscopy
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• v.52
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• pp.6.1-6.5
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• 2022

We examined the morphology of the fertilized egg and the fine structure of fertilized egg envelopes of Poropanchax normani belonging to the family Poeciliidae, also known as Norman's lampeye using light and electron microscopes. The fertilized eggs with narrow perivitelline space were found to be spherical and demersal, additionally containing small oil droplets in the vitelline membrane. Further, a bundle of adhesive filaments was observed to be present on one side of the fertilized egg. These filaments possessed remarkably high elasticity and were approximately 1-3mm in length. The size of the fertilized egg was determined to be about 1.49 ± 0.07mm (n=30). The outer surface appeared smooth, and adhesive filaments originating at different location of the surface of the envelope were found to be distributed around the egg envelope and were joined together to form a single long bundle in scanning electron microscopic observation. A peak-like structure formed of several straight wrinkles was observed around the micropyle. However, the complete structure of the micropyle could not be studied due to the depth at which it was located. Additionally, the total thickness of the egg envelope was ascertained to be approximately12.5-14.5㎛. The egg envelope consisted of two distinct layers, an outer electron dense layer and an inner lamellar layer, further consisting of 10 sublayers of varying thicknesses. Collectively, it was observed that the morphological characteristics of the fertilized egg, fine structures surrounding the micropyle, outer surface, adhesive structure consisting adhesive filaments, and sections of fertilized egg envelope displayed species specificity.

• Journal of Families and Better Life
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• v.23 no.2 s.74
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• pp.137-148
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• 2005

This study compared one-child households' economic structures between those who determined not to have more children and those who have a birth plan. This study examined the demographic characteristics and economic variables such as income, consumption expenditures, assets. debt, and a subjective evaluation of future economic status. Especially, it compared the effects of socioeconomic variables on expenditures on a child between low-fertility and birth-planned households. From a questionnaire completed by a husband or wife of one-child households, 154 low-fertility households and 201 birth-planned households were obtained. A t-test, chi-square test, multiple regression analysis and a dummy variable interaction technique were used. The findings of this study are as follows: First, low-fertility households were older, had higher income, and had more educated, employed wives. Their marital duration was longer, and their child was older than those of birth-planned households. Second, low-fertility households had higher consumption expenditures than did birth-planned households. Especially, expenditures of apparel and shoes, health care, education, and entertainment were significantly higher for low-fertility households. Also, low-fertility households spent more than did birth-planned households on a child. However, low-fertility households had significantly more debt than did their counterparts, and their expectation level of future economic status were lower than that of birth-planned households. Third, the effects of socioeconomic variables on expenditures on a child were different between low-fertility and birth-planned households. Age, education level, husband's occupation, wife's employment status, income, net asset, and subjective evaluation of future economic status showed significant differences. Income elasticity of expenditure on a child was significantly higher for low-fertility households than their counterparts.

• Human Ecology Research
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• v.51 no.5
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• pp.537-549
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• 2013

The purpose of this study was to develop an objective Ego Strength Scale for Children useful in research and clinical fields for measuring the ego strength of 3rd-6th grade children and to test its validity and reliability. For these purposes, we conducted a two-stage study. First, the scale was developed through data collection, composition of components and questions, a preliminary survey, and a main survey. The main survey was conducted with 1,185 3rd-6th grade children in Seoul and Gyeonggi province, and analyzed through exploratory factor analysis and reliability analysis. Second, the scale we developed was validated through confirmatory factor analysis and convergent-discriminant validity analysis for testing validity related to internal structure. The secondary survey was conducted with 5,494 3rd-6th grade children in Seoul and the province of Gyeonggi, Chungcheong, Gangwon, Jeolla, Gyeongsang, and Jeju. The study concluded the following: First, the scale was designed to measure 4 factors: competence, initiative, elasticity, and sociability using 26 questions. Second, the Ego Strength Scale for Children was found to be highly valid through validity tests. In addition, it showed high reliability in an internal consistency test and split-half reliability test. As this study developed and validated the Ego Strength Scale for Children in the current situation in which there are few objective instruments to measure children's ego strength, it is meaningful in that it laid the basis for broader future research on ego strength.