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Kang, Juhyun,Lee, Kunho,Yoo, Jae Young,Bae, Joongmyeon Elsevier 2018 International journal of hydrogen energy Vol.43 No.12
<P><B>Abstract</B></P> <P>An electroless plating process of nickel is introduced to solve the drawbacks of impregnation for developing the multiscale anode of a solid oxide fuel cell (SOFC). Impregnation is the conventional fabrication method of the electrode. The process is not favorable for depositing nanoscale metal catalysts due to severe problems including agglomeration of the catalysts while reducing metal oxides. Thus, as an alternative, we propose electroless plating of nickel to fabricate a multiscale nickel-based SOFC anode. A Ni-LSGM (La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>Ga<SUB>0.8</SUB>Mg<SUB>0.2</SUB>O<SUB>3-σ</SUB>) anode is selected. The low chemical compatibility of LSGM with nickel emphasizes the advantage of the electroless plating process. First, nanoscale nickel particles are successfully applied as the main catalyst of the SOFC anode by plating nickel to the surface of the LSGM scaffold substrate near the triple phase boundary region. Thin film X-ray diffraction and image analysis confirm that pure nanoscale nickel particles form on the entire substrate, even at a low temperature (60 °C) without secondary phase formation. Electrochemical impedance spectroscopy analysis is then performed to verify the possibility of implementing an efficient Ni-LSGM anode through nickel electroless plating. As a result, the new Ni-LSGM anode shows ∼50 times higher electrochemical performance than that of an impregnated Ni-LSGM anode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel electroless plating process was introduced to replace impregnation. </LI> <LI> Pure crystalline nickel was plated on a microporous LSGM scaffold structure. </LI> <LI> Electroless plated anode shows ∼50 times higher performance than an impregnated anode. </LI> </UL> </P>
전시뮤지엄 아이덴티티(M.I.)로서 전시 포스터 시리즈: 2000년대 이후 사례를 중심으로
강주현(Kang Juhyun) 한국디자인사학회 2023 Extra Archive: 디자인사연구 Vol.- No.7
이 연구는 일부 뮤지엄에서 나타나는 전시 포스터 시리즈를 연구한다. 전시 포스터 시리즈는 일정한 뮤지엄에서 일정 기간 동안 동일한 디자이너에 의해 만들어지는 연속적 포스터이며 이것은 뮤지엄 아이덴티티로서 작동한다. 뮤지엄의 아이덴티티와 더불어 뮤지엄을 찾는 관람객에게 보이는 대표적 시각물인 포스터가 연작(시리즈)으로 디자인되며 평면의 연속성을 가질 때, 단순 평면의 차원을 벗어나는 경험을 관람객에게 선사한다. 1940년대부터 진행되어 온 전시 포스터 시리즈 디자인의 역사를 관찰하고 2000년 이후의 전시 포스터 시리즈에 초점을 맞추어 연구를 진행한다. 동시대 그래픽 디자이너에게 전시 포스터 시리즈가 가지는 의미를 모색하며 그것이 관람객에게 뮤지엄 아이덴티티로서 어떻게 작동하는지 알아보고자 한다. 조사한 전시 포스터 시리즈 디자인을 바탕으로 전시 포스터 시리즈의 유형과 디자인 접근 방법에 따른 분류를 진행하여 해당 전시 포스터 사례를 분석한다. This research focuses on the exhibition poster series that appears in some museums. The exhibition poster series is a continuous series of posters created by the same designer for a certain period at a specific museum, and functions as the museum’s identity. Along with the museum’s identity, these posters, which are representative visuals presented to museum visitors, offer an experience that goes beyond the dimension of a simple flat surface when they have a continuity in their design. The study observes the history of exhibition poster series design, which has been ongoing since the 1940s, and focuses on the exhibition poster series after the year 2000. The study aims to explore the significance of the exhibition poster series for contemporary graphic designers and how it functions as the museum’s identity for the visitors. Based on the investigated exhibition poster series designs, the research categorizes and analyzes the cases of the exhibition poster series according to their types and design approaches.
청소년기 스트레스가 자살생각에 미치는 영향: 우울과 사회적 지지의 매개효과 및 조절효과를 중심으로
강주현 ( Juhyun Kang ),신택수 ( Tacksoo Shin ) 한국청소년학회 2015 청소년학연구 Vol.22 No.5
본 연구의 목적은 청소년기 스트레스와 우울이 자살생각에 미치는 직·간접 효과를 확인하는 동시에 스트레스와 자살생각과의 인과경로에 있어 사회적 지 지의 조절효과를 검증하기 위한 것이다. 서울 및 경기도 소재 고등학교 4곳을 임의표집하여 372명을 대상으로 자료를 수집하였으며 Mplus 5.21를 이용하여 이론 모형을 분석하였다. 자살생각변인에 영향을 미칠 수 있는 통제변인으로 성별, 연령, 종교유무, 부모와의 동거여부, 학교유형 등을 선택하였다. 연구결 과 이론에 근거하여 2차 요인구조로 수립한 측정모형은 자료를 잘 설명하는 것으로 나타났다. 스트레스와 자살생각의 직접경로는 유의미하지 않은 반면, 스트레스에서 우울, 우울에서 자살생각으로 이어지는 간접효과가 존재하는 완 전매개효과를 확인할 수 있었다. 사희적 지지에 대한 조절효과는 유의미하지 않았으며 통제변인 중 학교유형과 종교유무가 자살생각에 영향을 미치는 것으 로 나타났다. 마지막으로 연구의 함의를 살펴보고 제한점과 후속 연구의 방향 을 제시하였다. The purposes of this study were, first, to explore the direct and indirect effect of adolescents`` stress and depression on suicidal ideation and secondly to investigate the moderating effect of social support on stress and suicidal ideation. For this study, 372 students were randomly selected from 4 high schools located in Seoul and Gyeonggi-do, and a questionnaire survey was conducted, and the collected data was analyzed using Mplus 5.21. The findings are summarized as follows. First, the second-order factor measurement model explained the data well. Second, although stress had no significant direct effect on suicidal ideation, there existed a complete medication on path from stress to depression and from depression to suicidal ideation indicating depression had a positive indirect effect between stress and suicidal ideation. Third, stress and social support had no significant mixed effect on suicidal ideation. Fourth, The control factors such as school type and religion had meaningful effects on suicidal ideation. Finally, theoretical implication and the limit of this study were discussed.
Methylobacterium platani sp. nov., isolated from a leaf of the tree Platanus orientalis
Kang, Yoon-Suk,Kim, Juhyun,Shin, Hyeon-Dong,Nam, Young-Do,Bae, Jin-Woo,Jeon, Che Ok,Park, Woojun Microbiology Society 2007 International journal of systematic and evolutiona Vol.57 No.12
<P>A novel bacterial strain, designated PMB02(T), was isolated from a leaf of the tree Platanus orientalis. Colonies grown on TYG agar plates were circular, pink-pigmented and slow-growing, being 0.2-1.5 mm in diameter after 3 days growth. The cells of strain PMB02(T) were Gram-negative, aerobic, motile rods that possessed oxidase and catalase activities and grew at 20-30 degrees C, pH 6-8 and in media containing less than 1 % NaCl. The major respiratory quinone was identified as Q-10. A phylogenetic analysis based on 16S rRNA gene sequence comparisons indicated that strain PMB02(T) was related to members of the genus Methylobacterium. A comparative 16S rRNA gene sequence-based phylogenetic analysis placed the strain in a clade with the species Methylobacterium aquaticum and Methylobacterium variabile, with which it showed sequence similarities of 97.7 and 97.4 %, respectively. The values for DNA-DNA hybridization between strain PMB02(T) and M. aquaticum CCM 7218(T) and M. variabile GR3(T) were less than 32 %. On the basis of the phenotypic characterization, the phylogenetic analysis and the DNA-DNA relatedness data, strain PMB02(T) is considered to represent a novel species of the genus Methylobacterium, for which the name Methylobacterium platani sp. nov. is proposed. The type strain is PMB02(T) (=KCTC 12901(T)=JCM 14648(T)).</P>
( Juhyun Im ),( Jaihyunk Ryu ),( Woon Ji Kim ),( Sang Hun Kim ),( Si-yong Kang ),( Bo-keun Ha ) 한국육종학회 2018 Plant Breeding and Biotechnology Vol.6 No.2
The present study was conducted to evaluate the biological responses of soybean irradiated by gamma-rays. Four elite Korean soybean cultivars, Kwangankong, Shinpaldal-2, Shinhwakong, and Ilmikong, were irradiated with 100-400 Gy of gamma-rays. All cultivars showed significant reductions in morphological parameters. Seedling emergence rates of Kwangankong, Shinpaldal-2, Shinhwakong, and Ilmikong decreased by 46%, 31%, 44%, and 43% at 400 Gy, respectively. Plant height and fresh weight decreased with increasing dose. The median reduction dose (RD50) for plant height ranged from 184 to 278 Gy with an average of 212 Gy.The optimal dose of gamma irradiation for inducing mutation in the four elite soybean cultivars was in the range 200-300 Gy. Contents of malonaldehyde (MDA) in the gamma-ray irradiated plants were higher than those in the controls. With the exception of Kwangankong, activities of ascorbate peroxidase (APX) in other cultivars decreased at 100 Gy and started to increase significantly at 200 Gy and Shinhwakong cultivar had highest APX value observed at 300 Gy. No significant changes in peroxidase (POD) activity were observed inthe Kwangankong, Shinpaldal-2, and Shinhwakong, while, POD activity increased with increasing dose in Ilmikong. In addition, gamma-ray treatments elicited a marked reduction in chlorophyll a contents compared to chlorophyll b contents in Kwangankong, Shinpaldal-2, and Ilmikong. Growth characteristics (plant height and fresh weight) were highly negatively (P < 0.01) correlated with the dose of gamma-rays, while the MDA content and APX activities were positively (P < 0.05) correlated with dose.