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학령전환기 아동의 사회적 유능감이 행복감에 미치는 영향 : 학교적응의 매개효과 중심으로
김경화 ( Kim¸ Kyunghwa ) 인하대학교 교육연구소 2020 교육문화연구 Vol.26 No.4
본 연구는 학령 전환기 아동이 새로운 환경에 적응하는 것이 중요하다는 점을 반영하여 사회적 유능감이 학교적응을 매개로 행복감에 미치는 영향을 분석하였다. 특히, 학교는 유아학교에서 초등 교육기관으로 전환 되었다는 점에서 중요한 변수 이므로 학교적응 전체뿐만 아니라 하위 요인별로 매개효과를 검증 하였다. 연구방법으로는 육아정책연구소의 한국아동페널 7차년도(2014년)와 8차년도(2015년) 데이터를 사용하였다. 변인과 관련하여 결측값이 발생한 데이터를 제거하여 총 866명의 응답 자료를 바탕으로 Hayes(2018)가 제안한 PROCESS macro의 model 4번을 이용하여 분석하였으며, 간접효과는 부스트랩 샘플을 5,000개로 지정하여 분석하였다. 연구결과는 다음과 같다. 첫째, 학교적응은 사회적 유능감이 아동의 행복감에 영향을 미치는 매개효과가 있는 것으로 나타났다. 이때 매개효과는 부분매개로 나타났다. 둘째, 학교생활적응은 유아기의 사회적 유능감이 아동의 행복감에 영향을 미치는데 있어 매개효과가 나타나지 않았다. 셋째, 학업수행적응은 유아기의 사회적 유능감이 아동의 행복감에 영향을 미치는데 있어 매개효과 있는 것으로 나타났다. 이때 매개효과는 부분매개로 나타났다. 넷째, 또래관계는 유아기의 사회적 유능감이 아동의 행복감에 영향을 미치는데 있어 매개효과 있는 것으로 나타났다. 이때 매개효과는 부분매개로 나타났다. 다섯째, 교사관계는 유아기의 사회적 유능감이 아동의 행복감에 영향을 미치는데 있어 매개효과 있는 것으로 나타났다. 이때 매개효과는 부분매개로 나타났다. 이는 유아기 사회적 유능감이 높을수록 아동의 학교적응과 행복감이 높아질 수 있음을 알 수 있다. This study analyzed the effect of social competence on happiness through the mediating effect of school adaptation, reflecting the importance of adapting to a new environment during the transitional period of school age. Especially, since school is an important variable in that it transitioned from a childhood school to an elementary education institution, the mediating effect was verified not only for the overall school adaptation but also for each sub-variant. As for the research method, Korean Institute of dhild care and education's Korean Children's Panel data from the 7th year(2014) and 8th year(2015) were used. After removing data with missing values related to the variables, The data was analyzed using model 4 of the process macro proposed by Hayes(2018) based on a total of 866 responses. Indirect effects were analyzed with 5,000 bootstrap samples. The findings are as follows. First, school adaptation shows social competence has a mediating effect on child’s happiness. The mediating effect is partial mediation. Second, school life adaptation does not show early childhood’s social competence has a mediating effect on child’s happiness. Third, academic performance adaptation shows that early childhood’s social competence has a mediating effect on child’s happiness. The mediating effect is partial mediation. Fourth, peer adaptation shows social competence has a mediating effect on child’s happiness. The mediating effect is partial mediation. Fifth, teacher adaptation shows early childhood's competence has a mediating effect on child’s happiness. The mediating effect is partial mediation. This study shows that the higher the early childhood’s social competence, the higher child’s school adaptation and happiness.
Kim, Bokyung,Ji, Kyunghee,Kho, Younglim,Kim, Pan-Gyi,Park, Kyunghwa,Kim, Kyungtae,Kim, Youngsuk,Kim, Ki-Tae,Choi, Kyungho Pergamon Press 2017 Chemosphere Vol.185 No.-
<P><B>Abstract</B></P> <P>Cefadroxil and cefradine have frequently been detected in surface waters, however toxicological studies in aquatic organisms have mostly been limited to acute lethal effects. In the present study, endocrine disruption caused by cefadroxil and cefradine, and its underlying mechanism were investigated by chronic exposure of <I>Daphnia magna</I> (21 d) and <I>Oryzias latipes</I> (120 d). In medaka fish, the effects on growth, mortality, and reproduction, as well as on the levels of hormones and genes related to the hypothalamic-pituitary-gonad (HPG) axis, were investigated after 120 d exposure. In <I>D. magna</I>, the chronic effects on growth were observed at the highest concentration of 83.0 mg L<SUP>−1</SUP> cefadroxil and 80.8 mg L<SUP>−1</SUP> cefradine. The growth of juvenile fish was significantly impaired by exposure to cefradine. Following exposure to cefadroxil and cefradine for 120 d, sex-dependent changes in E2 hormones were observed and their levels were supported by the regulation of genes along the HPG axis. We found that chronic exposure to cefadroxil and cefradine impaired growth and reproduction in a freshwater invertebrate and fish, and altered the levels of sex hormones and genes associated with the HPG axis in fish.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cefadroxil and cefradine impaired growth in a freshwater invertebrate and a fish. </LI> <LI> Cephalosporin antibiotics altered gene transcriptions of the HPG axis in fish. </LI> <LI> Cefadroxil and cefradine modulated sex hormones and genes in a sex-dependent way. </LI> </UL> </P>
Chronic effects of zinc oxide nanoparticles on growth and reproductivity of Cyprinus carpio
Ji-eun Kim(김지은),Kyunghwa Park(박경화),Ig-chun Eom(엄익춘),Jae-woo Lee(이재우),Kyung-tae Kim(김경태),Yu-jin Shin(신유진),Mi-kyung Kim(김미경),Hee-jung Kim(김희정),Pilje Kim(김필제),Kyunghee Choi(최경희) 환경독성보건학회 2015 한국독성학회 심포지움 및 학술발표회 Vol.2015 No.10
Lee, Jin Wuk,Lee, Jae-Woo,Kim, Kyungtae,Shin, Yu-Jin,Kim, Jieun,Kim, Suhkmann,Kim, Heejung,Kim, Pilje,Park, Kyunghwa Elsevier 2017 Journal of hazardous materials Vol.340 No.-
<P><B>Abstract</B></P> <P>The aims of this study were to examine multi-generational reproductive toxicity and metabolism disturbances in <I>Oryzias latipes</I> exposed to 0.3, 3, and 30mg/L PFOA for 259-day. The highest concentration of PFOA suppressed fecundity over three generations from F0 to F2 and sac-fry survival rate in F2 generation, indicating that PFOA resulted in multi-generational reproductive toxicity <B>(<I>p<</I> </B> <B>0.05)</B>. Histologically, in F1 and F2 generations, <I>O. latipes</I> exposed to 30mg/L PFOA revealed accelerated gonad development, and the atrophy and degeneration of thyroid follicular cell. Glucose content showed the highest increase in both genders in all metabolites. However, alanine, glutamine, threonine, and lactate content, which are converted into glucose showed decline tendency, suggesting that PFOA led to gluconeogenesis. Change of osmolyte content affecting osmosis such as a decrease of male <I>myo</I>-inositol (<I>m</I>-Ino), an increase of female trimethylamine <I>N</I>-oxide (TMAO) and an increase of male dimethylamine (DMA) suggest that PFOA might affect osmoregulation of <I>O. latipes</I>. Oxaloacetate of male fish and succinate of female fish showed significant alterations, indicating that PFOA may affect energy metabolism differently by sex. These findings will help elucidate the toxicity of PFOA in diverse biological responses including metabolism change.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PFOA can affect carbohydrate metabolism and osmoregulation of <I>Oryzias latipes</I>. </LI> <LI> Glucose content can be used as a biomarker for PFOA exposure in <I>Oryzias latipes.</I> </LI> <LI> PFOA caused histological abnormality in gonad and thyroid follicular cell. </LI> <LI> PFOA caused multi-generational reproductive toxicity in <I>Oryzias latipes</I>. </LI> </UL> </P>
Feasibility of Spin-Echo Echo-Planar Imaging MR Elastography in Livers of Children and Young Adults
Kim, Jin Kyem,Yoon, Haesung,Lee, Mi-Jung,Kim, Myung-Joon,Han, Kyunghwa,Koh, Hong,Kim, Seung,Han, Seok Joo,Shin, Hyun Joo Korean Society of Magnetic Resonance in Medicine 2019 Investigative Magnetic Resonance Imaging Vol.23 No.3
Purpose: To assess the feasibility of the use of spin-echo echo-planar imaging (SE-EPI) magnetic resonance elastography (MRE) in livers of children and young adults. Materials and Methods: Patients (${\leq}20$ years old) who underwent 3T SE-EPI MRE were included retrospectively. Subjects were divided into three groups according to the purpose of the liver MRI: suspicion of fatty liver or focal fat deposition in the liver (FAT group), liver fibrosis after receiving a Kasai operation from biliary atresia (BA group), and hepatic iron deposition after receiving chemotherapy or transfusions (IRON group). Technical failure of MRE was defined when a stiffness map showed no pixel value with a confidence index higher than 95%, and the patients were divided as success and failure groups accordingly. Clinical findings including age, gender, weight, height, and body mass index and magnetic resonance imaging results including proton density fat fraction (PDFF), $T2^*$, and MRE values were assessed. Factors affecting failure of MRE were evaluated and the image quality in wave propagation image and stiffness map was evaluated using the appropriate scores. Results: Among total 240 patients (median 15 years, 211 patients in the FAT, 21 patients in the BA, and 8 patients in the IRON groups), technical failure was noted in six patients in the IRON group (6/8 patients, 75%), while there were no failures noted in the FAT and BA groups. These six patients had $T2^*$ values ranging from 0.9 to 3.8 ms. The image quality scores were not significantly different between the FAT and BA groups (P > 0.999), while the scores were significantly lower in the IRON group (P < 0.001). Conclusion: The 3T SE-EPI MRE in children and young adults had a high technical success rate. The technical failure was occurred in children with decreased $T2^*$ value (${\leq}3.8ms$) from iron deposition.