http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
음극지지형 단전지를 사용한 소형 SOFC 스택의 제조 및 출력특성
정화영,김우식,최선희,김주선,이해원,고행진,이기춘,이종호,Jung, Hwa-Young,Kim, Woo-Sik,Choi, Sun-Hee,Kim, Joosun,Lee, Hae-Weon,Ko, Haengjin,Lee, Ki-Chun,Lee, Jong-Ho 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.10
In this research, $5\times5cm^2$ unit cells were fabricated via liquid condensation process and uniaxial pressing followed by the screen printing of electrolyte and cathode layer. The SOFC stack was assembled with unit cells, gasket-type sealant and metal interconnect. The stack was designed to have a single column with internal-manifold and cross-flow type gas-channels. The SOFC stack produced 15 W, which is $50\%$ of the maximum power being expected from the maximum power density of the unit cell. Controlling factors for the proper operation of the SOFC stack and other designing factors of stack manifold and gas channels were discussed. 액상응결 공정법과 일축가압성형법으로 제조된 기판위에 전해질과 양극층을 스크린 인쇄법으로 구성한 후 열처리함으로써 최종크기가 $5\times5cm^2$인 SOFC 단전지를 제조하였다. 본 연구에서는 이들 단전지와 인코넬 합금으로 제조된 접속자 그리고 가스켓형의 밀봉재를 이용하여 스택을 구성하였다. 본 연구에 사용된 스택은 연료가스와 산화가스가 교차되는 형태의 가스채널을 가지며 가스매니폴드가 내부에 구성되어 있는 형태로 설계되었다. 제작된 3단 스택의 성능을 평가해 본격과 15W 정도의 최고출력을 나타내었는데 이는 단전지 출력성능으로부터 예측된 최고출력치의 $50\%$ 정도에 해당되는 출력이었다. 본 연구에서는 이러한 스택성능에 영향을 주는 조정인자들과 스택디자인 인자들에 대한 분석을 수행하였다.
KIST와 FZ-Julich SOFC간의 출력성능 비교
정화영,이상철,김혜령,이해원,이종호,Jung, Hwa-Young,Lee, Sang-Cheol,Tietz, Frank,Kim, Hae-Ryoung,Lee, Hae-Weon,Lee, Jong-Ho 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.12
We evaluate and compare the power generating characteristics of the anode supported SOFCs which have been fabricated from KIST and FZ-Julich in Germany. The performance and electrochemical property of each unit cell was characterized at the temperature range of $650-850^{\circ}C$ under same operating conditions and its microstructural property was thoroughly investigated via SEM after the performance test. According to the investigation, KIST- and FZJ SOFC showed different power generating characteristics in their temperature dependances due to their different design of electrode microstructure, especially the cathode microstructure. FZJ SOFC showed better performance at high temperature while showed lower performance at lower temperature. From the investigation about the correlation between microstructure and electrochemical property, we found that the superior performance of FZJ SOFC at high temperature was mainly due to its lower cathodic polarization resistance whereas better performance of KIST SOFC at lower temperature was mostly attributed to the lower ohmic resistance.
정화영(Hwa-Young Jung),김태성(Tae-Sung Kim),권용규(Yong-Kyu Kwon),한우섭(Woo-Sup Han),강기원(Ki-Weon Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper presents the probabilistic analysis for fatigue life of Glass/Epoxy laminates with impact-induced damage. For this, a series of impact tests were performed using instrumented impact testing machine. Then, tensile and fatigue tests carried out so as to generate post-impact residual strength and fatigue life. Two Parameter Weibull distribution was used to fit the residual strength and fatigue life data of composite laminates. The variance of residual strength decreased with increasing of impact energy. The fatigue life of impacted laminates was greatly reduced by impact energy and this trend depended on applied stress amplitude. Also, the variation of fatigue life was gradually decreased with the applied stress amplitude.
성별에 따른 유아의 정서능력과 어머니의 정서표현성과의 관계
정화영(Jung Hwa-Young),성소영(Sung So-Young) 계명대학교 사회과학연구소 2009 한국사회과학연구 Vol.28 No.2
The purpose of this study is to examine gender differences of young child's emotional competence and the relationship between emotional competence and the variation of mother's emotional expression across child's gender. The subjects of this study are selected from twelve Kindergartens and Child Care Centers located in Taegu and Gu-Mi. They are 326 children who are aged 5 to 6 and their mother. The children's Kindergarten teachers rated children's emotional competence as using measure of Woo's(2002) Emotional Competence Index for Children. The measurement of emotional expression of their mothers are measured by using the SEFQ developed by Halderstadt and his colleagues(1995) and adjusted by Seo(2006). Statistical analyses by using SPSS Win 14.0K are descriptive statistics including mean and standard deviation, t-test, and Pearson's correlation. Especially, Pearson's correlation is used to examine the relations between child's emotional competence and mother's emotional expression. The findings of this study are as follows: First, statistically significant gender differences in young child's emotional competence were found between boys and girls. Girls' emotional competence in, emotional expression, emotional recognition of others, emotional regulation, empathy, and emotional language was significantly higher than those of boys. Second, there were not found to be significant differences in mother's emotional expression according to child's gender. Third, testing the relationships between young children's emotional competence and mother's emotional expression showed that girls' emotional competence was somewhat related to mother's positive and negative emotional expression, while boys' emotional competence does not have an association with mothers' emotional expression. Therefore, these results showed that not only young children's gender but also mother's emotional expression was an important variable in young children's strategies of emotion competence.
정화영(Hwa-Young Jung),김진천(Jin-Cheon Kim),강기원(Ki-Weon Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Because of their superior performance and significant weight savings, the fiber reinforced composite materials have been widely used in the wide range of industry. In particular, for the naval structures, the weight reduction is critical design requirement and hence the development and design of composite structures is utmost important issue. In this study, a statistical analysis and a series of static tests are performed to identify the distribution of strength of carbon/epoxy composite material and to establish the design criteria for composite structures.