• Environmental Analysis Health and Toxicology
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• 제21권1호
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• pp.35-43
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• 2006

Reproduction and organ structure of the pale chub, Zacco platypus in Isa stream were investigated by means of histological methods. The results of the study confirmed reproductive abnormality and histopathological features in the pale chub. The gonadosomatic index (GSI) of the fish showed two peak in April and August. In summer season, GSI of the male was about two times of the female's GSI. Monthly variation of the gonadal development was very irregular. From the histological analysis of the organ structure, epidermal atrophy, necrosis and hyperplasia of pigment cell were observed in the skin. Epithelial layer lifting and clubbing of the lamella and bifurcation of the filament were observed in the gill. Also histological changes as congestion, cytoplasmic degeneration of hepatic cell, degeneration of bile duct, glomerular dilatation, degeneration of renal tubule and pycnosis of interstitial cell were identified in the liver and kidney, respectively.

• 컴퓨터교육학회논문지
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• 제7권4호
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• pp.27-42
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• 2004

본 연구는 중학교 컴퓨터 교과의 '홈페이지 만들기' 단원에서 개별화 수업과 교사 주도의 일제식 수업(전통적 수업)이 사전 컴퓨터 활용 경험에 따라 학업성취도와 흥미도에 어떤 영향을 미치는지를 실험연구를 통해 분석하고, 개별화 수업에 대한 학습자들의 학습태도와 인식을 질적 자료를 통해 분석하였다. 중학교 2학년 204명의 여학생이 본 연구에 참여하였다. 분석결과, 개별화 수업이 전통적 수업에 비해 학업성취도와 흥미도에 있어 높은 점수를 받았으며 학습태도와 인식에서도 긍정적인 반응이 많았다. 컴퓨터 사전 경험과 수업방법간에 상호작용 효과가 없는 것으로 나타났다.

• 아동학회지
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• 제31권4호
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• pp.49-60
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• 2010

This study sought to investigate and assess the development patterns of children, aged from 3 to 5, by means of a longitudinal approach. The children's developmental patterns are classified according to five curriculum areas; physical health, social skills, expression, language, and exploration-. The developmental patterns are analyzed in detail according to the observation period, children's ages, and their genders. The subjects consisted of 108 children in A city. A research assistant was asked to observe and keep records of the children's behaviors at three distinct times -early, middle, and late in the school year. The 'observational scale for children' was used as the measurement tool. The data which was thus collected was then subject to statistical analysis. The major findings of the study are as follows. First, there were significant differences in all five curriculum areas according to the children's age and observation period. That is, five-year-old children showed higher scores than three- and four-year-old children. Second, there were significant differences in the social development within five curriculum areas according to the children's gender and the observation period. That is, girls exhibited higher scores than boys.

• 대한가정학회지
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• 제34권5호
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• pp.131-144
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• 1996

The purpose of this study was to identify the effect of psychological characteristics-adolescence egocentrism, self-consciousness, body cathexis, and demographic variables on clothing behavior of adolescence. Adolescence egocentrism was measured by Kim's Imaginary Audience scale, and body cathexis, by selected questionnaires of Secord Jourard's Body Cathexis Scale. Buss's self-consciousness scae was slightly modified to assess public and Private self-consciousness, and five aspects of clothing behavior were assessed with the questionnaires from the previous studies dealing with clothing interest, psychological dependence, conformity, exhibition, dressing for others. The questionnaire were administered to 498 middle and high school boys and girls living in Seoul and the data were analyzed by Frquency, Factor Analysis, Pearson's Product Moment Correlation, ANOVA, Multiple Regression Analysis and Duncan test. The results of this study were as follows: 1) There were significant positive correlation between clothing behavior and adolescence egocentrism, self-consciousness whereas body cathexis generally were negatively related to clothing behavior. 2) Public self-consciousness and sex were the most influencial variables to clothing behavior among psychological characteristics and demographic variables. Also adolescence egocentrism was proved to be one of influencing factors on adolescence clothing behavior.

• 한국초등과학교육학회지:초등과학교육
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• 제17권1호
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• pp.1-10
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• 1998

A number of studies have shown that students have a stereotyped image of a scientist, and this image is often a rather negative. Earlier work on images of the scientist revealed to be consistent across the various social classes and across countries. This study aimed to examine a Korean students' stereotyped images of scientist, compare it with earlier work, and also find out whether students have other ideas about scientist, apart from the stereotyped image. To these purposes, modified DAST and individual interviews were carried out with 217 students and 53 students, respectively. The results are as follows : 1. Most of the students portrayed the scientist as a neat and young man with well-featured face, which was different from earlier studies. 2. Year 3 boys described the scientist as a mu, but year 3 girls as a woman. 3. Most of the students gave positive answers which were at variance with the streotyped image. 4. An interview asking only one question was a complement to DAST. It was concluded that students have private perceptions of scientists and their work, as well as a stereotyped image.

• Bulletin of the Korean Chemical Society
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• 제11권4호
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• pp.281-286
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• 1990

The kinetics and mechanism of reduction of Cu(II) with an excess D-penicillamine have been examined at pH = 6.2 and 0.60M in ionic strength. The reaction at the initial stage is biphasic with a rapid complexation process to give "red" transient complex of $[Cu(II)(pen)_2]^2$- that is partially reduced to another transient "brown" intermediate. The "brown" intermediate is finally reduced to diamagnetic "yellow" complex, $[Cu(I)(Hpen)]_n$. The final reduction process is pseudo-first order in ["brown" transient] disappearance $with {\kappa} = {{\kappa}_{3a} + {\kappa}_{3b}[pen]^{2-}},$ where ${\kappa}_{3a} = (5.0{\pm}0.8){\times}10^{-3}sec^{-1}$ and ${\kappa} = (0.14{\pm}0.02) M^{-1}sec^{-1}$ at $25^{\circ}C$. The activation parameters for the $[H_2pen]$-independent and $[H_2pen]$-dependent paths are ${\Delta}H^{\neq} = (52{\pm}5)kJmol^{-1},$ and ${\Delta}S^{\neq} = ( - 27{\pm}3)JK^{-1}mo^{l-1},$ and ${\Delta}H^{\neq} = (56{\pm}2)kJmol^{-1}$ and ${\Delta} S^{\neq} = ( - 18{\pm}0.7)JK^{-1}mol^{-1}$ respectively. The nature of "brown" intermediate is not clearly identified, but this intermediate seems to be in the mixed-valence state, judging from the kinetic and spectroscopic informations.

• 한국균학회지
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• 제21권1호
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• pp.38-50
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• 1993

내생균근 균이 포함된 토양을 이용하여 4종류의 식물인 수수, 돌콩, 차풀 및 참깨를 재배하여, arbucular mycorrhizae의 감염도 및 포자 증식을 조사 하였다. 감염율의 변화는 계속하여 50일까지 증가하고 있는 반면에 포자생성은 30일 이후에 증가율이 감소하는 것이 관찰되었다. 이로써, AM 감염도는 포자생성과 상관관계를 갖지 않은 것으로 나타났다. 또한, 다양한 지역의 토양을 포트배양하여 포자의 증식을 조사하였으며, 다음과 같은 결과를 얻었다. 다양한 토양을 이용하여 포트배양한 결과 많은 양의 새로운 포자를 얻을 수 있었으며, 82개 토양 중 43개 토양에서 포자의 증식이 관찰되었으며 4속 15종의 포자가 동정되었다. 포트배양한 토양의 pH를 조사한 결과 pH에 따라 포자의 생성이 일정한 경향을 보였으며, 대체로 낮은 pH에서 많은 포자 증식을 관찰하였다.

• 영재교육연구
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• 제20권3호
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• pp.867-883
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• 2010

교육자가 동기, 목표지향, 학업태도 등의 중요성을 인식하는 것은 영재들의 긍정적인 학습 공동체를 수립하는데 고려해야할 중요한 요소이다. 본 연구의 목적은 한국과 미국에서 최소한 수학 한 과목에서 영재교육을 받고 있는 5, 6, 7학년 영재 학생들의 학업 태도 및 동기를 알아보기 위한 것이다. 2004년에 개발된 McCoach와 Siegle의 <학업태도 평가조사: 개정판>의 모든 하위요소를 국가 간, 남녀 간 비교 연구했다. 전체 507명 (한국 278명, 미국 229명)중 여학생들이 남학생보다 동기/자기규율에서 더 높은 점수를 보였으며, 미국 학생들이 한국학생들보다 학교, 학업관련 자기인식, 목표지향, 그리고 동기의 하위 영역에서 높은 점수를 보였다. 교사에 대한 태도 요인은 국가 또는 성별에서 차이가 없었다.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제32권4호
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• pp.161-169
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• 2021

Objectives: Adolescent suicide is a serious social problem. Adolescent alcohol use is one of the most important risk factors for adolescent suicide. This study aimed to identify the relationship between drinking habits and suicide among Korean adolescents. Methods: Data from the 14th and 15th Korean Youth Risk Behavior Web-based Survey, conducted in 2018 and 2019, were used for analysis. Multiple logistic regression analysis was used to identify the relationship between drinking habits-including the age of drinking initiation, frequency of drinking, average drinking amount, frequency of drunkenness-and suicidal ideation, plans, and attempts. Results: Even after adjusting for age, sex, school grade, academic achievement, socioeconomic status, depression, stress, and drinking habits, the frequencies of drinking and drunkenness increased the risk of suicide attempts. Suicide attempts were associated with the frequency of drinking in girls and middle school students, and with the frequency of drunkenness in boys and high school students. Conclusion: This study identified associations between drinking habits (the age of drinking initiation, frequency of drinking, average amount of drinking, frequency of drunkenness) and suicidal behavior in adolescents. Our findings suggest that to prevent adolescent suicide, it might be necessary to investigate drinking habits, including the frequencies of drinking and drunkenness. Moreover, considering the differences in sex and school grade, it is important to include the individual group characteristics when evaluating drinking habits.

• 한국경제지리학회지
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• 제12권4호
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• pp.454-476
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• 2009

본 연구는 부산시 물류창고업의 신뢰형성 수준과 연계의 공간적 특성 간의 관계를 밝히고자 하였으며, 그 결과는 다음과 같다. 첫째, 신뢰형성 요인 중 '장기적 반복적 상호작용', '정보공유와 호혜성', '상호의존과 자산전용성'은 신뢰형성이 높은 수준인 미시적 신뢰, '근접성'과'불확실성'은 중간 수준인 중시적 신뢰, 그리고 '기업의 문화 및 규범과 공식적 제도'는 낮은 수준인 거시적 신뢰에 상대적으로 많은 영향을 미친다. 둘째, 거시적 신뢰, 중시적 신뢰, 미시적 신뢰 모두 공간적 근접성이 매우 큰 국지적 범위에서 대부분 형성되고, 신뢰형성 수준이 높을수록 연계의 공간적 범위는 국가적 범위, 국제적 범위로 확대된다. 셋째, 이러한 현상은 구매연계보다 판매연계에서, 제공하는 서비스 영역이 클수록, 수직적 연계보다 수평적 연계에서, 기업 간 관계가 발전할수록, 아웃소싱보다 공급사슬관리로 업무가 진행될 때 더욱 뚜렷하게 나타난다.