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유연하고 얇은 알루미늄 포일을 사용한 다공성 알루미나 막 제작
박영옥,김승우,고태준,Park, Young-Ok,Kim, Seung-Woo,Kouh, Tae-Joon 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.2
유연하고 얇은 0.025 mm와 0.2 mm의 두께를 지닌 알루미늄 포일을 사용하여 다공성 알루미나 막을 제작하였다. 알루미늄 포일들은 에탄올/과염소산 용액에서 전해연마하여 표면처리를 하였으며, 0.3 M의 옥살산 용액 안에서 양극산화 시켰다. 양극산학 시용액의 온도는 $9^{\circ}C$로 유지시켰으며, 전극에 가해주는 전압을 0.4와 40 V 사이에서 변화시킨 후, 형성된 알루미나 막의 표면을 주사전자현미경으로 관찰하였다. 관찰 결과, 장시간의 양극 산화 시 사용되는 전압의 크기가 1 V 이상일 경우 강한 전기분해 반응으로 인해 생성된 산화막 표면이 파괴되어 있음을 확인할 수 있었다. 반면 1 V 이하로 처리할 경우, 장시간에 걸쳐 안정적으로 양극산화시킬 수 있음을 알 수 있었다. 이 실험을 통해 얇은 알루미늄 포일의 경우 두꺼운 알루미늄 판과 달리 장시간의 양극산화를 통해 다공성 알루미나 막을 형성하기 위해선 1 V 이하의 낮은 전압이 요구되는 것을 확인할 수 있었다. We have fabricated porous aluminum oxide using flexible and thin aluminum foils with thickness of 0.025 and 0.2 mm. These foils were anodized with 0.3 M oxalic acid solution after being electropolished with ethanol/perchloric acid. During the anodization, the temperature of the electrolyte was maintained at $9^{\circ}C$ and the anodization voltage was varied between 0.4 and 40 V The surface of the anodized aluminum oxide was studied with a scanning electron microscope. From the scanning electron micrograph, we observed that when the voltage applied was above 1 V for a long period of time, due to a strong electrolysis reaction in electrolyte, the surface of the anodized oxide was destroyed. However, when the anodization voltage was less than 1 V, the anodization process was very stable and lasted much longer. Our results show that for a thin aluminum foil, unlike a thick plate, one requires small anodization voltage less than 1 V to form a porous aluminum oxide for long anodization time.
흡수제 내부순환형 탈황장치의 SO<sub>2</sub> 제거성능 특성
박영옥,박현진,김용하,Park, Young-Ok,Park, Hyun-Jin,Kim, Yong-Ha 한국대기환경학회 2011 한국대기환경학회지 Vol.27 No.6
Three new granular absorbents were prepared from calcium hydroxide, and applied to an FGD process with internal circulation. The aim of the study was finding the most efficient of the these three applied absorbents for the $SO_2$ removal at high flue gas temperatures. The absorbent is fed to the testing unit at high operation temperature and fluidized inside the FGD system where the sorbent particles react with the $SO_2$ gas. The rate of $SO_2$ decomposition was high in C-type absorbent which had the large surface area. De-SOx characteristics of the current absorbents appeared to be similar to the other conventional agents in this fluidized bed combustor. In particular, the optimum de-SOx condition could be achieved at high mole ratios of Ca to S which can reduce the residual $SO_2$.
박영옥(Young Ok Park),장진희(Jin Hee Jang) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12
Purpose: The purpose of this study is to analyze kindergarten teachers’ attitude toward inclusive education according to the variables into environmental support attitude, social support attitude, and academic support attitude to investigate the effect on inclusive education. Methods: This study conducted survey and analysis on 550 general early childhood teachers and early childhood special education teachers in national·public kindergarten and private kindergarten around the nation. Attitude of kindergarten teachers on inclusive education was analyzed using SPSS 20.0 and AMOS 20.0, and the results are as follows. Results: Attitude of kindergarten teachers towards inclusive attitude according to their variables was closely related with their responsible class, career in inclusive education, and training experience in inclusive education. It was identified that attitude of kindergarten teachers towards inclusive education(environmental support attitude, social support attitude, academic support attitude) affected the service agency, teaching experience, career in inclusive education, and inclusive education training as a major factor because there was correlation between background variables and responsible class(general class, inclusive class special class) of kindergarten teachers. Conclusions: To raise attitude toward inclusive education based on the research results, it would be necessary to take responsibility for securing kindergarten teachers status at the national level and to expand teacher education and training program for inclusive education to cope with actual situations by recognizing the importance of training program of inclusive education.
박영옥 ( Young Ok Park ),강은희 ( Eun Hee Kang ),박소정 ( So Jung Park ),박민아 ( Min A Park ),윤소윤 ( So Yoon Yoon ),김승란 ( Seung Lan Kim ),박정윤 ( Jeong Yun Park ),정영선 ( Young Sun Jung ),홍석경 ( Suk Kyung Hong ),예병덕 ( 한국정맥경장영양학회 2009 한국정맥경장영양학회지 Vol.2 No.1
Purpose: High gastric residual volumes (GRVs) are known to be one of the frequent causes of stopping enteral nutrition. This study was performed to investigate the gastric residual volume status in critically ill patients who were admitted to intensive care units. Methods: The subjects were 96 critically ill patients who were admitted to the ICU at ASAN Medical Center between October 1, 2008 and March 31, 2009. The measured volumes were categorized in 50 ml intervals from 0 to 500 ml. Results: Of the total GRVs measured, 46% were <50ml. The patients with a GRV ≥50 ml were 54% and 4% had a GRV ≥250 ml, whereas none of the patients` GRVs were ≥500 ml. When admitted to the hospital, There was a correlation between the APACHE 2 score and the gastric residual volume. This shows that the higher the APACHE2 score was the gastric residual volume. And there was a correlation between the APACHE 2 score and the loss of calories. This shows that the higher the APACHE 2 score was the loss of calories. Conclusion: The gastric residual volume of the critically ill patients under enteral nutrition in our hospital was not higher than that presented on the guidelines from the US and Canada. In addition, there was a big difference in the gastric residual volume among the critically ill patients depending on their clinical characteristics. Strict criteria for the gastric residual volume could be a factor for inhibiting proactive enteral nutrition. (KJPEN 2009;2(1):24-29)