• 아동학회지
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• 제24권5호
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• pp.1-14
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• 2003

The present study examined the symbolic levels of early pretense in 67 children from 19 to 48 months of age. Subjects were selected from 3 non-profit, play oriented daycare centers. Children were observed during free play. Age and sex differences were examined with 2-way ANOVA performed on case analyses of individual children. Results showed that the symbolic level of pretense increased with age, but no significant sex differences were found. Some children below 2 years of age showed high levels of symbolic play, presenting the possibility of high levels of representational thinking from this early age.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.591-594
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• 2005

Concrete structure that has been constructed in real field is on multi-axial stress state condition. After placing of concrete, hydration heat and shrinkage of concrete can cause various stress conditions with respect to the restraint level and condition. So, to predict the early age behavior of concrete structure, multi-axial material model is required and microplane model is acceptable. Recently, many studies have been performed on the microplane model, but the model developed up to now has been related to hardened concrete that material property is constant with concrete age. So, it is inappropriate to apply this model immediately to analyze the early age behavior of concrete. In this study, microplane model that can predict early age behavior of concrete was developed and cracking analysis using that was performed to describe cracking behavior for massive concrete sturucture.

• 대한의생명과학회지
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• 제15권1호
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• pp.9-15
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• 2009

Early age at menarche, which is indicator of early biological maturity, has been shown to be associated with increased adult body mass index. Early menarche has also been associated with many cardiovascular disease risk factors and metabolic syndrome. To evaluate the impact of menarche to cardiovascular risk factor, we assessed by age at menarche, brachial-ankle pulse wave velocity (baPWV), which represents arterial stiffness, in women with or without metabolic syndrome. The subjects recruited for this study were three hundred one women. Relatively early menarche and relatively late menarche were classified according to less than $50^{th}$ percentile for relatively early menarche, and great than the $50^{th}$ percentile for relatively late menarche. Subject were divided four group, 1) women who had not adulthood metabolic syndrome and relatively early menarche, 2) women who had not adulthood metabolic syndrome and relatively late menarche, 3) women who had adulthood metabolic syndrome and relatively early menarche, 4) women who had adulthood metabolic syndrome and relatively late menarche. Women who had a relatively early menarche with adulthood metabolic syndrome had significantly high levels of blood pressure, triglyceride, fasting insulin and homeostatic model assessment of insulin resistance (HOMA-IR) levels than women with late menarche with adulthood metabolic syndrome, and had significantly lower HDL-cholesterol levels. And also, women who underwent a relatively early menarche with metabolic syndrome had highest level of baPWV in adult. In this study we found effect of age at menarche on adulthood metabolic risk factors for cardiovascular disease (e.g., baPWV, insulin resistance, hyperlipidemia) in Korean women.

• 한국콘텐츠학회논문지
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• 제19권12호
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• pp.593-603
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• 2019

본 연구의 목적은 건강상태를 선행요소로 두고 건강수준의 차이가 노화가 진행되는 과정에서 노후소득수준에 미치는 영향을 분석하는데 있다. 이를 위해 국민연금공단의 국민노후보장패널자료를 사용하여 1차(2005년)부터 6차년(2015년)까지 10년 동안 종단자료에 모두 존재하는 923명을 최종 분석대상으로 선정하였다. 기술통계분석결과 노년초기건강상태의 차이에 따라 노후소득차이가 발생하는 것으로 조사되었다. 즉, 56~60세 노년초기의 건강상태가 양호한 대상자가 건강하지 못한 대상자에 비해 상대적으로 높은 경제적 수준을 10년간 지속하고 있었다. 다중회귀분석결과에서는 성별, 배우자유무, 교육수준의 효과를 통제한 경우 통계적으로 유의한 수준에서 노년초기건강상태가 좋을수록 소득수준이 증가하였다. 또한 노년초기 건강상태가 좋은 고령층은 건강하지 못한 고령층보다 노후소득이 높았으며, 건강상태에 따른 소득차이가 고령화와 함께 지속되고 있었다. 따라서 본 연구에서는 노년초기건강상태의 향상과 노년초기 건강상태가 노후소득에 미치는 부정적 영향을 완화시킬 수 있는 정책적 실천적 방안들을 제시하고 있다.

• 한국의상디자인학회지
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• 제13권4호
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• pp.79-91
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• 2011

This study divided school age by considering a change in the stage of body growth by age in elementary schoolgirls with the use of body scan data, and considered by comparing body size characteristics by school age. Elementary schoolgirls' body shape cannot be divided clearly. However, ages 7-10 were bound into the same group for the majority of girth, width, and thickness items. 7-8 years old, 9-10 years old, and 11-12 years old were bound into the same group in most items except ages 9 and 10 for the height item. Thus, significant difference was indicated between groups. Accordingly, this study divided the school age into three periods such as early stage(ages 7-8), middle stage(ages 9-10), and late stage(ages 11-12) in consideration of the stages for elementary schoolgirls' body-shape growth. As a result of analyzing body size according to division of school age, the higher school age leads to continuous growth. The notable growth was indicated especially in the middle stage and late stage. Examining centering on typical items related to the clothing construction, there was notable increase in waist thickness and hip thickness between early and middle stages and in height, weight, breast girth, waist circumference, back length, breast width, and waist width between middle and late stages. On the other hand, hip circumference, hip width, breast thickness, and length between shoulder edges were indicated to grow relatively and evenly among early, middle, and late stages. The lateral form was shown a clear difference in the forms of early, middle, and late stages in height and length of the whole body shape and in side thickness. The early and middle stages belong to body shape that abdomen is projected to be curved. The late stage showed right body shape which is straight and stable form in posture.

• 생물치료정신의학
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• 제24권3호
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• pp.202-208
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• 2018

Objectives : The purpose of this study was to investigate the differences in forensic demographic characteristics, interpersonal problems and personality disorder between early and late onset criminal patients with schizophrenia. Methods : The participants included 187 inpatients with schizophrenia who had committed crimes. They filled out the Korean Inventory of Interpersonal Problem Personality Disorder Scales and Psychopathic Personality Inventory-Revised. They were divided into early onset group and late onset group according to onset age of schizophrenia at 26 years old(under 26 versus 26 and older) and forensic demographic characteristics, interpersonal problem and personality disorders including psychopathy were compared between two groups. Results : There were no differences in gender, education years and family history between the two groups. Early onset group was associated with lower age, earlier onset of age and earlier age at the time of the crime. Duration from onset to diagnosis was not different between the two groups. Duration from onset to crime and after diagnosis to crime was shorter in late onset group. There were no differences between the two groups in the interpersonal problems, personality disorder and psychopathic personality evaluation. Conclusion : These results suggested that there may be forensic demographic differences related to crime between early and later onset schizophrenia. Psychiatrists should consider the age at onset of schizophrenia when assessing the risk of violence in patients with schizophrenia. In the future. it will be needed other study of age classification such as admixture analysis.

• 콘크리트학회논문집
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• 제12권3호
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• pp.47-55
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• 2000

Protections from the frost damage at early ages are one of the serious problems to be considered in cold weather concreting. Frost damage at early ages brings about the harmful influences on the concrete structures such as surface cracks and declination of strength development. Therefore, in this paper, protecting periods of frost damage at early ages according to the standard specifications provided in KCI(Korean Concrete Institute) are suggested by appling logistic curve, which evaluates the strength development of concrete with maturity. W/B, kinds of cement and curing temperatures are selected as test parameters. According to the results, the estimation of strength development by logistic curve has a good agreement between calculated values and measured values. As W/B and compressive strength for protecting from frost damages at early ages increase, it is prolonged. It shows that the protecting periods of FAC(Fly Ash Cement) and BSC(Blast-furnace Slag Cement) concrete are longer than those of OPC(Ordinary Portland Cement) concrete. The protecting peridos from frost damage at early age by JASS are somewhat shorter than those by this paper.

• Clinical and Experimental Pediatrics
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• 제58권3호
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• pp.77-83
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• 2015

Relative to a fetus of the same gestational age, very low birth weight (VLBW) infants are more likely to be underfed and to undergo growth restriction during their early hospital stay. The current trend towards "early and aggressive" nutritional strategies in VLBW infants aims to overcome the early nutritional deficiency and thereby boost postnatal catch-up growth, simultaneously improving long-term neurodevelopmental outcomes. Although the minimum starting amino acid (AA) dose to prevent negative nitrogen balance is well established, the upper limit and the rate of increase of early AA doses are controversial. Most randomized controlled trials show that early and high-dose (target, 3.5 to 4.9 g/kg/day) AA regimens, with or without high nonprotein calories, do not improve long-term growth and neurodevelopment. High-dose AA supplementation may lead to early metabolic disturbances and excessive or disproportionate plasma AA levels, particularly in infants of very low gestational age. Further large studies are needed to clarify the optimal strategy for early administration of parenteral AA doses in VLBW infants.

• 한국의류학회지
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• 제20권4호
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• pp.596-608
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• 1996

For design of early childhood children's footwear, this study was to analyze the properties of their foot. This study was performed in 200 male and 200 female early childhood children from 3 and 6 years old lived in susan urban area. There were measured 17 items of the foot and calculated 4 indexs for analysis. The result was as follows; 1 The growth rate differs from the sites of a foot. According to the growth of age, early childhood children's foot are more slender. 2. The average of foot print angle is $15~27^{\circ}$ and it is flat. Among the age groups, the numbers of 4 kinds of foot print angle are different siginificantly. 3. The average of metatarso phalanx angle is $174~178^{\circ}$ that is higher than adults'. 4. There are no significant difference between male children's foot and female childen's one except tarsal circumference and tarsal height. Tarsal part of male children is higher and ticket than female children's. 5. Because some of 3~6 age groups belong to the one foot length group, we should consider the age properties of foot in order to design footwears. When the size of footwear is divided by only foot length, the ranges of another measurements are larger than the range of foot length.

• Computers and Concrete
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• 제13권1호
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• pp.31-47
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• 2014

This research is focused on obtaining the fracture property of steel fiber reinforced concrete(SFRC) specimens at early ages of 1, 2, 3 and 7-day, respectively. For this purpose, three point bending tests of nine groups of SFRC beams with notch of 40mm depth and different steel fiber ratios were conducted. The experimental results of early age specimens were compared with the 28-day hardened SFRC specimens. The test results indicated that the steel fiber ratios and curing age significantly influenced the fracture properties of SFRC. A reasonable addition of steel fiber improved the fracture toughness of SFRC, while the fracture energy of SFRC developed with curing age. Moreover, a quadratic relationship between splitting strength and fracture toughness was established based on the experiment results. Additionally, afinite element (FE) method was used to investigate the fracture properties of SFRC.A comparison between the FE analysis and experiment results was also made. The numerical analysis fitted well with the test results, and further details on the failure behaviors of SFRC could be revealed by the suggested numerical simulation method.