코발트와 나이오븀이 코팅된 NiO 용융탄산염 연료전지 양극물질 특성 연구

최희선,이철우,김건,Choi, Hee-Seon,Yi, Cheol-Woo,Kim, Keon 한국전기화학회 2010 한국전기화학회지 Vol.13 No.3

용융탄산염 연료전지(MCFC)의 양극으로 사용되는 NiO는 $650^{\circ}C$의 용융탄산염과 산소 분위기 조건에서 안정하고 높은 전기 전도도를 가지는 장점이 있다. 그러나, 장시간 운전 시 양극에서 전해질로의 Ni dissolution은 전지 내부의 단락을 초래하여 전지의 수명을 단축시킨다. 본 연구에서는 대체 전극물질로서 코발트와 나이오븀을 코팅시킨 NiO 전극을 제조하였으며, 이렇게 제조된 전극은 기존 NiO전극과 비교하여 낮은 Ni dissolution과 안정되고 우수한 전기화학 성능을 보임을 확인하였다. NiO is commonly used as the cathode for the molten carbonate fuel cell due to its stability and high electrical conductivity in molten carbonates and oxygen atmosphere. However, long-term operation of MCFC has a serious problem which is the degradation of cathode material, the so-called Ni dissolution. In the present study, we have attempted to synthesize a new alternative cathode material as Co/Nb-coated NiO cathode. The results obtained in this study suggest that the Co/Nb-coated NiO cathode can be utilized as having lower dissolution and higher cell performance than those of the pure NiO cathode.

[환경] 한지 생산공정에서 발생하는 폐수의 탈색 및 슬러지 회수

최희선(Hee-Seon Choi),김태진(Tai-Jin Kim) 한국분석과학회 2000 분석과학 Vol.13 No.3

대학 교육 서비스 품질에 관한 연구

최희선(Hee-seon Choi),정승환(Soong-hwan Chung) 대한경영학회 2014 대한경영학회 학술발표대회 발표논문집 Vol.2014 No.1

본 연구는 최근 우리나라 대학의 학령인구 감소, 교육시장의 개방과 취업난의 심화 및 청년 실업의 증가, 2014년도부터 시행되는 교육부의 대학 평가제도 개선을 통한 대학정원감축과 최하위그룹의 퇴출 등으로 대학은 유례없는 위기 상황에 직면하고 있으며 대학은 교육서비스 개선을 통하여 경쟁력을 강화시켜야만 경쟁우위를 지킬 수 있으며 이에 따라 대학교육서비스 품질에 관련하여 대학이 학생에게 제공할 교육서비스의 차원을 새롭게 마련하며 나아가 대학의 경쟁력을 확보하는데 필요한 대학 교육 서비스품질에 있어서 Kano모형과 Timko의 고객만족 계수를 이용한 품질요소 평균 을 적용하여 "A" 종합대학과 "B" 전문대학을 비교분석하고 서비스를 제공 받고 있는 수요자인 학생들의 입장에서 대학교육서비스 관련하여 어떠한 서비스를 제공 받고 싶은지에 대하여 만족과 불만족을 유발하는 품질요소들을 분류하고 대학교육 서비스 품질에 대하여 전략적 활용방안을 규명 하였다는 것이 학문적, 실무적으로 의의를 지니며 교육서비스 품질 분석을 통하여 학생들의 욕구와 불만족을 충족시킨다면 대학생활 만족도가 증가될 것이며, 대학의 대외 경쟁력이 향상될 것이라 판단된다. Recently Korean universities are facing dangers of withdrawal and reduction of student members because of the university estimation system by the Education Ministry of Korean government, from 2014, in the situation where the population to receive education is decreasing and the difficulty in getting jobs is worsening. Universities are required to strengthen its competitive power to survive by improving the educational service. Therefore, this research is conducted for inducing the strategies to improve the quality of university education for better competitive ability. This research select 31 quality elements for evaluating university education services. The practical survey is conducted with relation to A university in Seoul and B college in Kyeong-gi province. It employs Kano model and Timko model, focusing on their coefficient of customer satisfaction. It classifies the elements that trigger satisfaction or dissatisfaction among students as the customer of education service. This research has an academic implication that it classifies such elements and suggests strategies to be used for improving the quality of university education. The quality of education is the service given in the process of higher education and the core of the service that universities provided. It influences most on the future of students. With the opening of education market, it becomes a very important element of competition. Therefore, if we can meet the needs of students through the survey of their satisfaction and dissatisfaction, their degree of satisfaction with the university life will be improved and the competitive ability of the universities will be raised.

형광시약 Safranine-O를 이용한 유리 시안화 이온의 분광형광법 정량

Hee-Seon Choi(최희선) 한국분석과학회 2012 분석과학 Vol.25 No.3

[환경] 한지 생산공정에서 발생하는 슬러지의 분석

최희선(Hee-Seon Choi),김태진(Tai-Jin Kim) 한국분석과학회 1999 분석과학 Vol.12 No.4

Cu(Ⅱ)-tiron 킬레이트를 이용한 EDTA 분광형광법 정량

최희선(Hee-Seon Choi) 한국분석과학회 2011 분석과학 Vol.24 No.3

계면활성제를 이용한 한지 섬유질 슬러지의 제거

최희선(Hee-Seon Choi),김태진(Tai-Jin Kim) 한국분석과학회 2001 분석과학 Vol.14 No.2

농촌노인의 치아상태에 따른 건강상태 및 식이섭취 평가

최희선 ( Hee Seon Choi ),문현경 ( Hyun Kyung Moon ),김혜영 ( Hye Young Kim ),최정숙 ( Jeong Sook Choi ) 대한영양사협회 2010 대한영양사협회 학술지 Vol.16 No.1

In Korea, there has been a rapid increase in the number and proportion of elderly people, especially in rural areas, due to improvements in the standard of living and medical technology. One of the main health problems for the elderly people is dental health, which can cause nutritional and health problems. Thus, in this study, the dental health status and health status in relation to nutritional intake were analyzed. A total of 155 rural-dwelling elderly people (68 males, 87 females) over the ages of 65 participated in this study. The subjects were classified into three groups; the no denture no teeth group, denture user group, and natural teeth group. The dietary intake, biochemical health status, and anthropometry were evaluated. Can-pro 3.0 was used to assess dietary intakes and the SPSS 12.0 program was used for statistical analysis. The results showed that the natural teeth group had better nutritional and dietary intake status than the no denture no teeth group. The dietary assessment showed that there were differences in food intakes among the groups, which depended on their dental health status. In conclusion, dietary management is required for the elderly since each group has a different ability to chew food depending on their dental health status. In addition, the elderly will need different therapeutic diets because of the high prevalence of chronic degenerative diseases.

KANO 모형과 Timko의 고객만족 계수를 이용한 대학교육 서비스품질에 대한 연구

최희선(Choi, Hee Seon),정승환(Chung, Soong Hwan),최강화(Choi, Kang Hwa) 한국서비스경영학회 2014 서비스경영학회지 Vol.15 No.4

This research is conducted for inducing the strategies to improve the quality of university education for better competitive ability. This paper select 31 quality elements for evaluating university education services. The case study is conducted with relation to small & medium-sized ‘A’ university in Seoul and ‘B’ college in Kyeong-gi province. It employs Kano and Timko model, focusing on their coefficient of customer satisfaction. It classifies the elements that trigger satisfaction or dissatisfaction among students as the customer of education service. This research has an academic implication that it classifies such elements and suggests strategies to be used for improving the quality of university education. The quality of education is the service given in the process of higher education and the core of the service that universities provided. It influences most on the future of students. With the opening of education market, it becomes a very important element of competition. Therefore, if we can meet the needs of students through the survey of their satisfaction and dissatisfaction, their degree of satisfaction with the university life will be improved and the competitive ability of the universities will be raised.

Dithizone 금속착물을 이용한 용매추출 및 부선기술 (제1보). 코발트 및 구리의 추출에서 보조리간드로서 티오시안산이온의 속도증가 효과

최윤석,최희선,김영상,Choi, Yoon Seok,Choi, Hee Seon,Kim, Young Sang 대한화학회 1998 대한화학회지 Vol.42 No.1

In this study, the extraction of Co(Ⅱ) and Cu(Ⅱ) into chloroform solution of dithizone, distribution ratios, extractabilities and extraction rate constants of the metal complexes were compared in each case with which thiocyanate ion was or not used as the auxiliary ligand. The use of the thiocyanate ion increased threefold the distribution ratio for Co(Ⅱ) complex in a basic solution and twofold for Cu(Ⅱ) complex in a wide pH range. And the extractability was also augmented from about 90 to 99 for Co(Ⅱ) and from 95 to 99 for Cu(Ⅱ) in a given period. The extraction rate constants were $k_1\;:\;1.2{\times}10^5$, $k_2\;:\;1.34{\times}10^{17}\; mol^{-1}dm^3s^{-1}$ in case of Co(Ⅱ) and$k_1\;:\;1.1{\times}10^8$, $k_2\;:\;2.83{\times}10^{10}\; mol^{-1}dm^3s^{-1}$ in case of Cu(Ⅱ) on the extraction of dithizonate complexes into chloroform solution. Co(Ⅱ)와 Cu(Ⅱ)의 금속이온을 디티존의 클로로포름용액으로 추출할 때, 보조 리간드로 티오시안산이온을 사용하여 금속착물의 분포비, 추출률 및 추출속도상수를 구하여 보조 리간드를 사용하지 않았을 경우와 비교하였다. 착물의 분포비는 보조 리간드가 없을 때보 다 보조 리간드가 있을 때, Co(Ⅱ)는 염기성에서 3배 정도, Cu(Ⅱ)는 넓은 pH범위에서 2배 정도 더 크게 나타났고, 추출률은 보조 리간드가 존재하면 Co(Ⅱ)는 90에서 99%로, Cu(Ⅱ)는 95에서 99%로 증가하였다. 그리고 추출속도상수 $k_1\;은\;Co(Ⅱ):1.2{\times}10^5, k_2: 1.34{\times}10^{17} mol^{-1}dm^3s^{-1}$이였으며 Cu(Ⅱ)는$k_1\;과\;k_2$가 각각$1.1{\times}10^8과\;2.83{\times}10^{10} mol^{-1}dm^3s{-1}이였다.