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umu-test에 의한 2-bromopropane의 遺傳毒性 調査
金永煥,池用熙,邊子眞,金範錫,柳寅晟 高麗大學校 倂設 保健大學 保健科學硏究所 1996 保健科學論集 Vol.22 No.1
Genotoxicity/mutagenicity of 2-bromopropane and toluene, benzene, trichloroethylene was investigated using umu-test with a Salmonella typhimurium TA1535 strain. The tester strain was derived by introducing plasmid pSK 1002, which carried a umu C-lac Z fussion gene into S.typhimurium TA1535, and tester strain in the presence of microsomal activation proved to be the more sensitive maker of genotoxcicity. Among the chemicals examined 4 compound induced umu gene expression, which could be defined on a basis of increased β-galactosidase activity in all 2- fold over the background level. But β-galactosidase activity appearance in all experiment chemical was not so high in compared with that background level.
황혜자,변영인 東亞大學校 學生生活硏究所 1999 學生硏究 Vol.27 No.-
The study was designed to examine what type of daily stress factors kindergarten children have and what kind of coping behaviors they apply. A total of two hundred and fifty children was employed for the data to be surveyed and analyzed. The results of the study are summarized as follows. First, kindergarten children were experiencing the following daily stress factors: Difficulty with the family and parents was the most severely stressful factors, and difficulty with the peers, difficulty with the self-esteem, and difficulty with the academic work were shown in decending order, in terems of the severity of the stress. Second, the most severely stressful the kindergartner experiencing were the parents' favoritism toward a particular sibling the family and difficulty with getting along with their peers. Third, in terms of stress factors, the coping behaviors the kindergartner used tended to be emotional and defensive. Especially with relatevely severely stressful factors, they tended to be more defensive. However, with relatively lower level of stressful factors, the children, applied problem-centered copying behaviors. Fourth, in the evaluation of the stress factor and copying behaviors, higher levels of reliability and validity were shown. One of the speculations about the reasons might be study included the person to person interview method in the process of data collection.
초등학교 남학생의 BMI 수준에 따른 신체구성, 체력, HOMA 및 혈중 지질변인 농도의 비교
변자영(Ja Young Byun),김기진(Ki Jin Kim) 한국발육발달학회 2012 한국발육발달학회지 Vol.20 No.2
The purpose of this study was to analyze the comparison of body composition, physical fitness, blood lipid profile, and insulin resistance of elementary school boys (16grade) according to body mass index (BMI) levels. Subjects were divided into 3 groups (Obese: 95% above, Over-weight: 85% above, Normal weight) according to BMI levels. Body composition items (% body fat, WHR (waist hip ratio), lean body mass, skinfold thickness, and body circumference) of obese and over-weight group were significantly (p<.05) higher than normal weight group. HDL-C of obese group was significantly (p<.05) lower than normal weight group, and TG and insulin concentration of obese and over weight group were significantly (p<.05) higher than Normal weight group. Glucose and HOMA-IR of Over weight group were significantly (p<.05) higher than normal weight group. Grip strength per body weight of obese group was significantly (p<.05) lower than normal weight group. In conclusion, body composition and blood variables showed a declining trend according to decreasing BMI. Wheres physical fitness showed an increasing trend according to decreasing BMI. Further studies are needed to better elucidate the changes in insulin resistance according to BMI levels in a child.
경제위기가 이익예측치 속성과 시장반응에 미치는 영향: 국내와 외국계 증권사 애널리스트의 비교를 중심으로
변자영 ( Ja Young Byun ),최영수 ( Young-soo Choi ),홍주연 ( Joo Yeon Hong ) 한국회계학회 2017 회계학연구 Vol.42 No.4
본 연구에서는 경제환경에 따라 국내 증권사 애널리스트(국내 애널리스트)와 외국계 증권사 애널리스트(외국계 애널리스트)의 상대적 이익예측치 속성과 이익예측치에 대한 상대적 시장반응이 어떻게 달라지는지를 실증분석하였다. 이익예측치 속성으로는 이익예측치의 정확성과 편의를, 이익예측치에 대한 시장반응으로는 시장의 민감도와 수익률을 이용하였으며, 1997-98년의 외환위기기간과 2008년의 금융위기기간을 경제위기기간으로 설정하였다. 국내와 외국계 애널리스트의 상대적 성과에 대한 선행연구의 결과는 혼재되어 있다. 지리적 근접성과 정보수집의 용이성 등으로 국내 애널리스트가 정보우위에 있다는 주장이 있는 반면, 글로벌 네트워크와 선진 금융기법을 통한 우수한 분석능력 등으로 외국계 애널리스트의 성과가 더 높다는 주장도 있다. 본 연구에서는 국내와 외국계 애널리스트의 상대적 성과와 시장반응을 분석한다기 보단 그러한 상대적 성과와 시장반응이 경제위기 여부에 따라 어떻게 달라지는지에 초점을 맞춘다. 분석결과는 다음과 같다. 첫째, 비위기기간 동안에는 국내와 외국계 애널리스트의 이익예측치 정확성 및 편의에 차이가 없었으나 경제위기기간 동안에는 외국계 애널리스트의 이익예측치 정확성이 더 낮고 보다 낙관적인 경향이 있었다. 둘째, 비위기기간 동안에는 국내와 외국계 애널리스트가 발표한 이익예측치에 대해 시장의 민감도에 차이가 없었으나 경제위기기간 동안에는 외국계 애널리스트의 이익예측치에 대해 시장이 보다 민감하게 반응하였다. 그러나 국내와 외국계 애널리스트의 이익예측치에 대한 시장수익률은 경제위기의 여부와 상관없이 동일하였다. 본 연구는 경제위기 여부가 국내와 외국계 애널리스트의 상대적 이익예측치 속성 및 시장반응에 미치는 영향을 종합적으로 분석한 최초의 연구이며, 자본시장에서 중요한 역할을 하는 경제환경과 애널리스트에 대해 폭넓은 이해를 도모하였다는 점에서 학문적, 실무적 의의를 갖는다. This paper comprehensively examines the effect of economic crisis on the relative attributes of earnings forecasts (i.e., accuracy and bias) and the relative market reaction to earnings forecasts (i.e., stock price variability and returns) produced by local versus foreign analysts. We categorize all analysts following Korean firms into local and foreign analysts, and classify 1997-98 asian crisis and 2008 financial crisis as the economic crisis period. The main results of the study are as follows. First, while the accuracy and bias of earnings forecasts produced by local and foreign analysts are not significantly different during the non-crisis periods, foreign analysts seem to be less accurate and more optimistic than local analysts during the economic crisis periods. Second, while the market sensitivity to earnings forecasts produced by local and foreign analysts are not significantly different during the non-crisis periods, capital market participants tend to more sensitively react to foreign analysts` forecasts than local analysts` forecasts during the economic crisis periods. However, stock returns around the announcement date of earnings forecasts are not significantly different for local and foreign analysts regardless of economic conditions. Overall, the economic environment seems to be a crucial factor to the different attributes of and the different market reaction to earnings forecasts produced by local and foreign analysts. Thus, the paper has implications for investors by shedding light on that economic conditions can change the relative informational advantages and incentives of local and foreign analysts.