• 대한치과교정학회지
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• 제17권1호
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• pp.73-83
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• 1987

The purpose of this longitudinal study was to examine the growth changes of mandibular symphysis and lower incisors with age. The material was 294 lateral cephalometric radiographs taken longitudinally from 6 to 13 year old children, who were not teated orthodontically. The following conclusions seem to be warranted. 1. The sex difference of the measurements of mandibular symphysis and lower incisors were not statistic ally significant. 2. There were growth increments (2.69mm in boys and 2.08mm in girls) in the total thickness of mandibular symphysis. 3. There were a great change and individual variations on the curvature of anterior border of mandibular symphysis. 4. The chin angle had a tendency to decrease progressively in both sexes. 5. There were growth increments (8.23mm in boys and 7.40mm in girls) in the anterior dental height. 6. The lower anterior teeth tended to incline labially with age.

• 한국결정성장학회지
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• 제7권2호
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• pp.191-196
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• 1997

다양한 미세결함분석기술(OM, TEM, AFM)을 이용하여 승화법에 의해서 성장된 6H-Sic 단결정 wafer의 내부미소결함을 분석하였다. Wafer내부에는 6각판상헝의 석출물 및 micropipes들이 독립적으로 혹은 혼합적으로 존재하고 있음이 확인되었고, TEM 분석에 의한 비정질상의 검출로 이들은 불안정한 결정성장 인자나 비화학양론적 $Si_{1-x}_xC_x$ 화합물 형성에 기인한다는 사실을 확인하였다.

• 한국수학교육학회지시리즈A:수학교육
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• 제50권1호
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• pp.103-118
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• 2011

The study examined whether the relation between mathematics self-efficacy and mathematics achievement was partially mediated by the learning strategies, using latent growth model analyses. It was also examined the auto-regressive, cross-lagged (ARCL) panel model for testing the stability and change in the relation of mathematics self-efficacy and learning strategy over time. The study analyzed the first-year to the third-year data of the Korean Educational Longitudinal Survey (KELS). The result of ARCL panel model analysis showed that earlier mathematics self-efficacy could predict later learning strategy use. There were linear trends in mathematics self-efficacy, learning strategy, and mathematics achievement. Specifically, mathematics achievement was increased over the three time points, whereas mathematics self-efficacy and learning strategies were significantly decreased. In the analyses of latent growth models, the mediating effects of learning strategies were overall supported. That is, both of initial status and change rate of rehearsal strategy partially mediated the relation of mathematics self-efficacy and mathematics achievement. However, in elaboration and meta-cognitive strategies, only the initial status of each variable showed the indirect relationship.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제31권3호
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• pp.154-160
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• 2020

Objectives: It remains unclear whether methylphenidate (MPH) has yadverse effects on growth in children. This study aimed to investigate the association of MPH with serum biological markers of growth in children with attention-deficit/hyperactivity disorder (ADHD). Methods: The present study included 103 children with ADHD (64 drug-naive children, 39 MPH-treated children) and 112 control subjects. Children with ADHD were diagnosed on the basis of a semi-structured interview. Levels of biochemical markers of growth, including insulin-like growth factor-I, thyroid stimulating hormone (TSH), free T₄, calcium, phosphorus, alkaline phosphatase, vitamin D, hemoglobin, total protein, albumin, total cholesterol, and hematocrit were measured in these individuals. Results: Except in case of TSH, no intergroup differences were found in the levels of the growth markers. The levels of TSH were found to be lower in the MPH-treated boys with ADHD than in the drug-naive and control groups (p<0.05), although the levels of TSH in all the groups were within normal limits. Conclusion: In this cross-sectional study, no significant association was found between MPH and growth markers. This calls for the need to carry out prospective longitudinal research studies in the future that investigate the effect of MPH on the growth trajectory in children.

• 보건교육건강증진학회지
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• 제15권1호
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• pp.97-114
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• 1998

This study's purpose is to clarify the growth pattern of Down Syndrome cases -particulary centering on the adolescent growth pattern - and to draw up a standard growth chart on body height and weight which is one estimation of physical growth for the effective caring of their health. I sampled 269 Down syndrome cases (Male 151, Female 118) whose ages ranged from 6 years of age to adulthood and 348 normal control cases (Male 175, Female 173) who were in same age group with Down Syndrome. We also picked 124 Down syndromes cases(Male 70, Female 54) and gathered 8 year longitudinal data on their body height and weight. The results were that, I found Down syndrome cases' height to be short and their weight to be overweight. As far as age at peak height velocity was concerned, boys were at 11-12 years of age and girls were at 10-11 years of age, showing that girls were about one year faster. Peak height velocity was 6.8cm/yr for boys and 5.4cm/yr for girls. The age at peak weight velocity were 12-13 years for age for boys and 10-11 years of age for girls. Peak weight velocity was 5.7kg/yr for boys and 4.3kg/yr for girls. The menarche age of girls with Down syndrome was anticipated to come about 2 years after peak height velocity and peak weight velocity. Finally, we drew up a standard growth chart and compared it with that of the NCHS, which caused us to come to the conclusion that the Standard Growth Chart for Down syndrome cases in Korea that came out of this study was appropriate for the growth-assesment of Down syndrome.

• 한국산학기술학회논문지
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• 제21권6호
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• pp.275-285
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• 2020

본 연구는 시간이 지남에 따라 학교에 대한 학생인식의 변화를 추적하고, 교육복지우선지원사업 참여 여부가 그 변화를 어떻게 설명하는지, 변화의 결과가 학생들의 학습몰입, 자신감, 교우관계에 어떠한 영향을 미치는지 분석하는 것을 목적으로 한다. 교육복지정책중점연구소에서 2015년부터 2017년까지 전국 총 103개 학교(초등학교 51개, 중학교 52개)로부터 수집한 자료를 활용하였다. 1차년도의 표본 수는 총 820명, 2차년도는 911명, 3차년도는 837명이었다. 본 연구는 무조건 성장 모형(unconditional growth model)과 조건 성장 모형(conditional growth model)의 두 단계를 거치는 잠재성장모형을 적용하여 분석하였다. 분석 결과 첫째, 교육복지우선지원사업 참여 학생들의 학교에 대한 인식은 시간이 지남에 따라 성장선을 보여주었다. 둘째, 학교에 대한 학생인식의 개선은 학생들의 학습몰입, 자신감, 교우관계에 모두 정(+)적인 영향을 미치는 것으로 분석되었다. 향후, 교육복지우선지원사업의 효과성을 극대화하기 위해서는 학교에 대한 인식 개선을 목적으로 하는 프로그램을 교사 주도로 교육복지우선지원사업 대상 여부에 관계없이 모든 학생에게 제공하며, 집중지원이 필요한 학생에 대해서는 교육복지사 중심으로 맞춤형 통합지원 프로그램을 제공하는 것이 바람직하다는 제언을 제시하였다.

• Journal of Preventive Medicine and Public Health
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• 제20권1호
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• pp.97-113
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• 1987

This study was carried out to know physical growth and development, physical and nutritional indices and body fat weight and so forth by semi-longitudinal research method to measure body height, body weight, chest girth and sitting height of 260 of general high school and 306 of vocational high school 3rd grade students who are living in Seoul and born from 1966 March 1st to 1967 Feb.28th. The results are as follows: 1) Physical growth and development Growth in terms of body height showed one step straight linear development, andthat of body weight showed two step straight linear development in each section in high school. The age of cross over between two sexes of general high school students was between 10.6 to 12. 3 years in body height, between 10.8 to 13 years in body weight, between 11.2 to 14.6 years in chest girth and between 10 to 13 years in sitting height. The age of cross over between two sexes of vocational high school students was between 10.5 to 12.5 years in body height, between 10.5 to 12.5 years in body weight, between 10.5 to 12.5 years in chest girth and between 10.5 to 12.5 years in sitting height. In this periods, female group was superior to male group and after that male group was superior to female group again. The growth of vocational school students was superior to that of general school students in both sexes in terms of body height and body weight significantly. 2) Physical growth and nutritional indices In all cases of relative body weight, relative chest girth and relative sitting height, it was found to be increasing thereafter with advancing ages. In cases of $R{\"{o}}hrer$ index and Kaup index, it was found to be reaching to normal state thereafter with advancing ages. In each case of Vervaeck and Pelidisi index, it was found to be increasing and reaching to normal state thereafter with advancing ages. 3) Total body fat by vital measuring method Average values of body surface area, body volume and body density are measured indirectly by using the body height and body weight as Table 12, 13 and 14. The rate of body fat weight of general high school students was from minimum $11.96{\pm}3.53%(3.33{\pm}1.10kg$) to maximum $18.25{\pm}6.46%(9.08{\pm}2.01kg$) in male and from $25.88{\pm}3.62%(7.96{\pm}0.78kg$) to $43.00{\pm}7.22%(12.91{\pm}1.21kg$) in female. The rate of body fat weight of vocational high school students was from minimum $11.20{\pm}2.88%(3.32{\pm}1.13kg$) to maximum $17.16{\pm}5.88(10.83{\pm}3.16kg$) in male and from minimum $25.11{\pm}2.26%(7.91{\pm}0.89kg$) to maximum $42.16{\pm}7.96%(13.22{\pm}1.75kg$) in female.

• 한국심리학회지:학교
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• 제18권2호
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• pp.175-195
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• 2021

친밀한 친구 관계를 맺고 소속감을 느끼는 것은 청소년의 심리·사회적 발달 및 적응에 긍정적인 영향을 미친다. 소속감 지향성은 소속감을 추구하는 동기로, 성장 지향성과 결핍감소 지향성으로 구분된다. 성장 지향성과 결핍감소 지향성은 심리적 적응 및 대인관계 특성에 서로 다른 영향을 주는 것으로 알려져 있다. 본 연구의 목적은 청소년의 소속감 지향성이 심리적 적응과 친구 네트워크에 미치는 효과를 알아보는 것이다. 이를 위해 한 중학교의 2학년 전체 학생을 대상으로 학기 초와 학기 말에 검사를 실시했다. 친구 네트워크는 네트워크 수신 중심성 분석을 통해 측정했다. 다층 회귀모형을 사용한 분석 결과는 첫째, 학기 초의 외로움과 스트레스에 대한 성장 지향성의 효과는 학기 초 친구 네트워크 중심성을 분석 모형에 함께 투입해도 유의했으나, 결핍감소 지향성의 효과는 유의하지 않았다. 둘째, 성장 지향성은 학기 말의 친구 네트워크 중심성을 유의하게 예측했다. 이러한 효과는 학기 초 친구 네트워크 중심성과 학기 말 심리적 적응 수준을 분석 모형에 함께 투입해도 유의했다. 셋째, 학기 말의 심리적 적응에 미치는 학기 말의 친구 네트워크 중심성의 효과는 학기 초 및 학기 말의 심리적 적응을 모형에 함께 투입해도 유의했다. 본 연구는 단기-종단적 설계를 통해 소속감 지향성이 청소년의 학기 초와 학기 말의 심리적 적응과 친구 네트워크 수준에 미치는 효과를 경험적으로 밝혔다는 점에서 의의가 있다. 끝으로, 본 연구의 한계점 및 후속 연구를 위한 제언을 논의했다.

• 한국분무공학회지
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• 제2권1호
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• pp.8-17
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• 1997

A study has been carried out on the instability of a conical liquid sheet by using the linear instability theory. Various analytical methods using the Kelvin-Helmholtz instability theory were tried to examine the wave growth on cylindrical liquid sheets. Cylinderical liquid sheets were extended to the case with the conical sheets. Perturbations due to tangential motion as well as longitudinal one were taken into account. And it was assumed the the breakup occurs when amplitude ratio exceeds exp(12), drop sizes were predicted only by theoretical approach. The predicted drop size agreed well with the measured Sauter mean diameter, $D_{32}$.

• 대한치과의사협회지
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• 제19권2호통권141호
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• pp.167-174
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• 1981

The purpose of this study was observing the annual growth increment in cephalogram. The cephalograms of 29 boys & 23 girls were analized by method of Downs & Steiner, range from 7 to 8 years in Korean children. the results were as follows; 1. The craniofacial complex of Korean children grew downward and fordward. 2. The pronounced linear and angular growth changes were in the upper central incisors and lower central incisors. 3. The SN Plane to Mandibular plane angle was reduced. 4. The SNA and SNB was almost constant in male.