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철-크롬 산화환원흐름전지에서 Nafion막의 철-크롬 Crossover
김영숙,오소형,김은비,김다영,김성지,추천호,박권필,Kim, Young-Sook,Oh, So-Hyeong,Kim, Eunbi,Kim, Dayoung,Kim, Seongji,Chu, Cheun-Ho,Park, Kwonpil 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.1
산화환원흐름전지(Redox Flow Battery, RFB)는 대용량 에너지 저장장치로 바나듐 산화환원흐름전지가 대표적인 RFB인데, VRFB는 고가인 점이 문제다. 철-크롬RFB는 저가의 활물질을 사용해 경제적인 점이 장점인데, 성능이 낮은 점이 해결해야할 과제다. 낮은 성능의 한 원인이 활물질의 크로스오버인데, 본 연구에서 철과 크롬 이온의 Nafion 막 크로스오버 및 Nafion 막의 안정성에 대해 실험하였다. 철과 크롬이온의 Nafion 막 투과도는 각각 $5.5{\times}10^{-5}$, $6.0{\times}10^{-5}cm^2/min$ 이었다. Nafion 막에서 바나듐 이온의 투과도 $2.9{\times}10^{-6}cm^2/min$ 보다 18.9~20.7배 높아 철과 크롬 이온의 Nafion 막 크로스오버가 성능 저하의 한 원인임을 보였다. 온도 증가에 따라 크로스오버가 급증(활성화 에너지 38.8 kJ/mol)하므로 낮은 온도에서 구동하는 것이 크로스오버에 의한 성능감소를 저하시키는 방법임을 나타냈다. Nafion막은 3M HCl용액에서 비교적 안정적이었다. The redox flow battery (RFB) is a large-capacity energy storage equipment, and the vanadium redox flow cell is a typical RFB, but VRFB is expensive. Iron-chrome RFBs are economical because they use low-cost active materials, but their low performance is a urgent problem. In this study, the crossover of iron and chromium ion through Nafion membrane and the stability of Nafion membrane in HCl solution were investigated. The permeability of iron and chrome ion through Nafion were $5.5{\times}10^{-5}$ and $6.0{\times}10^{-5}cm^2/min$, respectively, which was 18.9~20.7 times higher than that of vanadium ion ($2.9{\times}10^{-6}cm^2/min$). The crossover of iron and chromium ions were shown to be a cause of performance decrease in Iron-chrome RFB. As the temperature increases, the crossover increases rapidly (activation energy 38.8 kJ/ mol), indicating that operation at low temperature is a methode to reduce the performance loss due to crossover. Nafion membranes were relatively stable in 3 M HCl solution.
수포성 피부 병변으로 시작된 수포성 전신성 홍반성 루프스
김영숙,강호정,최혜영,강형철 ( Young Sook Kim,Ho Jung Kang,Hae Young Choi,Hyung Chul Kang ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.4
We describe a 19-year-old girl showing typical laboratory and clinical features of bullous systemic lupus erythematosus(BSLE). Clinically she has suffered from recurrent vesiculobullous skin eruptions for 7 years. The bullous eruption has not been known as the initial manifestation of SLE until she was diagnosed as SLE. These cutaneous lesions have waxed and waned with oral prednisolone with or without dapsone. Bullous SLE should be considered in the differential diagnosis of children presenting with generalized bullous eruptions. (Kor J Dermatol 1997;35(4): 767-771)
비정상 조직에서 Protein Carboxyl Methyltransferase 의 활성도 및 그 Isoenzyme 의 변화에 관한 연구
김영숙,전길자 ( Young Sook Kim,Gil Ja Jhon ) 생화학분자생물학회 1988 BMB Reports Vol.21 No.4
The levels of protein carboxyl methyltransferase, an enzyme that methylates free carboxyl groups of altered protein and its isoenzymes were determined in normal and abnormal tissues (normal blood, diabetic blood, normal stomach and its tumor, normal breast and its tumor). Protein carboxyl methyltransferase activities were higher in the diabetic blood and the tumors than in their normal tissues. The distributions of protein carboxyl methyltransferase isoenzymes in normal tissues were different from in abnormal tissues. These results suggest the measurements of PCM activity and its isoenzymes offer a possible clinical diagnosis.
김영숙,손혜숙,강정학,이창희,이채언,Kim, Young-Sook,Shon, Hae-Sook,Kang, Jeong-Hak,Lee, Chang-Hee,Lee, Chae-Un 대한예방의학회 1995 Journal of Preventive Medicine and Public Health Vol.28 No.3
Authors purposed to observe activities of occupational health nurses and it's related factors, and to suggest the way that induct better occupational health nurses' activities with questionaire to 87 occupational health nurses who individually work as health manager in the plant. The questionaire included type of plant and number of workers, general characteristics, work conditions, activities, etc. Major findings are as follows. 1. 82.8% of occupational health nurses were third decade. 93.1% graduated junior college or college. And 82.8% were not married. 2. General work conditions: 40.2% were belonged to safety-health section, 98.85% were mere clerks. 60.9% worked less than weekly 44 hours, and an annual salary of 50.6 % was between 10 million and 14 million won. 3. Work condition related to health manager work: there was separated health care room in 94.3%, working period as health manager(occupational health nurse) was less than 5 years in 70.1%, 49.4% had the out-of-health manager work. In 87.4%, occupational physician was appointed, only 6.9% of them were full time, 52.9% of them worked little in the plants. The problems related to workers' health were discussed with industrial nurses in 88.5%. 4. Attitude for their work: 88.5% were thought that their work is important for workers' health care, 57.5% satisfied to work as health manager. In 51.7%, motive to being industrial nurse were the appropriate aptitude. 5. Activities: General medical care in 100% were carried out, in 97.7% works related to general health examination, in 100% works related to special health examination were carried. But works related to use of protective apparatus were carried out in 20.8%. 6. Factors related to level of activities: In cases who solved the health related problems by themselves, the level of activites was significantly higher than in others. In cases there were full time occupational physician, the level of activities was significantly lower. 7. Occupational health nurse's needs: 100% wanted regular education, 89.7% wanted the qualifying examination. As the results, author suggests that the right of self-control is given to occupational health nurses and the work of occupational physician is clearly defined for the induction of the better activities of occupational health nurses.