• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.132-135
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• 2004

High-performance concrete (HPC) may be expected to differ from usual concrete with respect to shrinkage behavior, and it shows high autogenous shrinkage due to the use of very low water-binder ratio (w/b) and various admixtures. Therefore, in order to minimize the shrinkage stress and to ensure the service life of concrete structure, volumetric change of HPC should be understood. In this study, small prisms made of HPC with w/b of 0.32 and blast-furnace slag content of $0\%,\;30\%,\;and\;50\%$ were prepared to measure the volumetric changes such as autogenous shrinkage, drying shrinkage, and swelling under three different curing conditions. It was observed that the concrete cured. sealed condition showed only autogenous shrinkage while the concrete let to dry condition at temperature of $20^{\circ}C$ and relative humidity of $60\%$ during the test period showed both autogenous and drying shrinkage. Moreover, the concrete exposed to dry condition after 2-day water curing swelled and then started to shrink with age. The total shrinkage (autogenous+drying) of this concrete was smaller than that of the concrete cured dry condition, especially at early-age. Therefore, the early-age moisture curing is very effective to control or minimize the volumetric change and its induced stress of HPC.

• Child Health Nursing Research
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• v.2 no.1
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• pp.5-12
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• 1996

The purpose of this study was to explore the maternal caretaking behaviors during the first 3 days postpartum. The sample consisted of 132 healthy, married women and their baby was full-term & normal also. Data were collected from April to June 1995 and analyzed using SPSS. The results of this study are as follows : 1. Primiparous mothers feel difficulty in performance of caretaking behavior for their baby was especially bathing, umblical cord care, identify the crying & baby's condition. But mothers feel doing so well was diaper change, clothing, immunization etc. 2. The results revealed that caretaking behaviors was not related to age, education & family. After the birth of a baby, the baby needs caring of parents especially mother. So, the mother feel difficulty in performance of maternal role. It means higher educational need for mother. Nurses were the primary source for caretaking behavior during early postpartum period at hospital and home also. Therefore the nurse need the strategies of nursing intervention to increase for caretaking activites of primiparous mothers. Further research is needed to determine which strategies affect the mother's competence of their caretaking behavior.

• Korean Journal of Child Studies
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• v.27 no.5
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• pp.95-107
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• 2006

This study measured various types of joint book reading behaviors of parents of preschool children using two different text genres. Participants were the parents of 35 preschool children 4 years of age. Parent-child dyads were videotaped during periods of joint book reading using two different types of text(informational and narrative). Results indicated differences in maternal behavior between the two types of texts. The informational book elicited a higher amount of print concept behaviors and more content behavior while reading the narrative book. Among content-related behaviors parents used more labeling during the informational genre. On the other hand, parents' use of description and judgment were significantly higher in the narrative genre compared with the informational genre.

• Journal of the Korean Home Economics Association
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• v.42 no.2
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• pp.69-82
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• 2004

The purpose of this study is to evaluate a practical consumer education program for kindergarten children and to investigate whether consumer education affects their consumer knowledge and consumer behavior. The subjects of this study were 32 5-year-old kindergarten children who participated (experimental group) and 25 kindergarten children who did not participate (control group) in the consumer education program. Consumer education was held for 6 hours twice a week during October 8 to 29, 2002. Questionnaire surveys were conducted before and after the education program. Percentiles, frequencies, means, and ANCOVA were utilized for data analysis with SPSS program. The results of this study showed that consumer education had very positive and significant effects on consumer knowledge (p<.01) and consumer behavior (p<.05) among kindergarten children. Furthermore, consumer education for only three weeks had effectively enhanced kindergarten children's ability as consumers. These results imply that consumer education should be served periodically and systematically from an early age. Diverse subjects and teaching methods must be developed and utilized for consumer education of kindergarten children.

• Korean Journal of Child Studies
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• v.25 no.4
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• pp.147-162
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• 2004

Children 5 and 8 years of age and undergraduates constructed stories using the wordless picture book, "Frog, where are you?" On a separate task, they explained the good and bad behaviors of others. The constructed stories of task 1 and responses of task 2 were audiotaped, analyzed by clauses, and then coded into the mind-related categories. Results showed that on both tasks the subjects used the actor's desires and intentions much more than the other categories of mind. Undergraduates used more mind-related expressions in making their stories than children, but they were not different from children in considering the minds of others for behavior explanations. Positive but non-significant correlations were found between scores in constructing stories and scores in behavior explanations.

• Korean Journal of Child Studies
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• v.29 no.3
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• pp.23-40
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• 2008

This study investigated the beliefs in Developmentally Appropriate Practice (DAP) of 447 mothers of 4- and 5- year-old children by mother's childhood experience, parenting efficacy, and parenting behavior. Results showed that mother's beliefs in DAP were related to children's age, early childhood educational institution, monthly household income, mother's educational background, mother's childhood experience, parenting efficacy, and parenting behavior. Mothers with higher beliefs in DAP were mothers of kindergarten rather than mothers of daycare children; they had 4 years or more college education, and more than $3000 monthly household income.

• Journal of Families and Better Life
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• v.20 no.6
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• pp.141-149
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• 2002

In order to promote well-being during old age, it is important to start preparing early on for the later life. Based on this thesis, this study examined attitudes of the middle-aged women residing in rural towns on their preparation for old age as well as related variables. For this purpose, survey data from 200 individuals were analyzed using a SAS program. The overall degree of preparation for old age was quantified as about 67 points out of a 100 possible points. The variables that affected the level of preparedness include attitude toward using a paid nursing home ($\beta$=.23), type of agricultural work they engage in ($\beta$=-.21), who do you think is a supporter during your old age($\beta$=.20)］, type of decision-making in the household ($\beta$=.17). The explanatory power of such variables as standards of living ($\beta$=.18), family type ($\beta$=-.18), recognition of the entrance of old age ($\beta$=.17), and preparation behavior for old age ($\beta$=.15) were partially proved in three sub-areas (economical, emotional, and leisure areas) of preparation. The groundwork of this study could be used as basic materials to develop an educational program to improve the attitudes toward preparation for old age.

• Journal of Korean society of Dental Hygiene
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• v.22 no.1
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• pp.29-36
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• 2022

Objectives: This study aimed to examine the association between age at menarche and two major oral diseases. Methods: Data from the 7th Korean National Health and Nutrition Examination Survey (2016-2018) were used. The participants included girls and women aged 12 years and above. Thedataofa total of 7,420 participants were analyzed. Statistical analyses were performed using complex samples cross-tabulation analysis and complex samples general linear model. Results: The average age at menarche of those aged 12 to 80 years was 13.81 years. The age at menarche was found to be associated with decayed-missing-filled teeth (DMFT) (p<0.05). When the age at menarche was nine years, DMFT was 4.20 when it was 19 years, DMFT was 10.80. The age at menarche was found to be associated with periodontal tissue state (p<0.05). The group with early menarche age had healthier periodontal tissues (17.1%), whereas the group with late menarche age had more unhealthy periodontal tissues (17.9%) (p<0.001). Conclusions: The age at menarche was associated with two major oral diseases. Therefore, it is necessary to provide women with oral hygiene care and oral health education to prevent major oral diseases before their secondary sex characteristics appear.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.319-327
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• 2016

The objective of this study is to identify the secular trend in age at menarche and to investigate the factors influence the early menarche(<12 years old) among Korean middle and high school girls. We analyzed data from the Korean Youth Risk Behavior Web-based Survey(KYRBWS) 2006-2014. This study was a descriptive study of 216,917 Korean middle and high school girls born between 1988 and 2002. Linear trends test performed to assess the trend age at menarche and percentage of early menarche. Multiple logistic regression analysis was to assess the risk factors influence the early menarche. Mean age at menarche decreased from $12.61{\pm}1.32$ years for middle and high school girls born 1988 to $11.88{\pm}0.75$ years for those born 2002(p for trends<.001). Percentage of early menarche increased from 19.7% to 25.2% between 1988 and 2002(p for trends<.001). Living in city, higher stress level, short sleep duration, and higher body mass index were associated with an early menarche among middle and high school girls(all p<.001). We found that age at menarche is still falling in the Korean adolescents, and it need intervention strategies to control the early menarche.

• International Journal of Human Ecology
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• v.5 no.2
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• pp.123-134
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• 2004

A convenience samples of Korean-Canadian/American adults who lived in Vancouver, San Hose and Los Angeles areas for over 10 years, were studied in 2000. Total of 130 adults were analyzed by immigration age. The age of immigration age was divided into 3 groups: the young group immigrated at 25 or before, the middle group immigrated at 26 to 40, and the old group immigrated at over 40. Their average length of residence in Canada and the U.S. was a little longer than 20 years. The dietary behavior patterns were similar among 3 groups, except co-eaters and dining-out frequency, and the Korean-Canadians/Americans seemed to be more home-based, family-tightened and traditional patterns than Koreans in Korea. They liked Korean traditional basic dishes, but their children liked a-la-carte ones and immigrants at early 20's showed similar food preferences as young generations. The attitudes of dietary acculturation for themselves and for their children were high. Since immigrating at age 26 to 40 years old rather than 20's or over 40's, showed stronger acculturation attitudes even with no significance and revealed significantly differences in some dietary behaviors and food preferences, it is recommended that immigration age should be considered when planning dietary foodservices at nursing care systems for Korean Canadians/Americans.