1 kWe 급 고체산화물 연료전지 스택에서의 유동 해석

이근우,김영진,윤호원,김현진,윤경식,유지행 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.2

This study performed the numerical analysis of the internal flow phenomena of 1 kWe-class solid oxide fuel cell (SOFC) stacks with internal manifold type and planar cells using commercial computational fluid dynamics (CFD) software, Star-CCM+. In particular, the locations where the turbulent phenomena occur inside the SOFC stack were investigated. In addition, the laminar flow model and the standard k-ε turbulent model were used to calculate the SOFC stack, separately. And, the calculation results of both laminar and turbulent models were compared. The calculation results showed that turbulent phenomena occurred mainly in the cathode flow. Especially, the turbulent phenomena were found in the cathode inlet/outlet region, and local turbulence occurred in the end plate near the inlet pipe.

도저용 착시 도재-금속 개면에서의 원소이동에 관한 실험적 연구

이근우,이호용,Lee, Keun-Woo,Lee, Ho-Yong 대한치과보철학회 1987 대한치과보철학회지 Vol.25 No.1

This study was undertaken to observe the elemental transition of Interface depending on different pretreatment methods, the number of filings, the kinds of porcelain powders and the various alloys in ceramo-metal restoration. The materials used in this study were Pors-on $4^{(R)}$ and Ceramco porcelain powder to compare the differences depending on the pretreatement methods and the number of firings. Ceramco porcelain powder and Vita porcelain powder were used to compare the differences of elemental transition depending on the porcelain powders. The $Parasil^{(R)},\;PGV^{(R)}$ and Pors-on $4^{(R)}$ as Pd-Ag alloy were used to compare the difference of elemental transition depending on the various alloys. The pretreatment methods were : no treatment, treatment under vacuum and air, treatment with 50 % hydrofluoric acid and double heat tretament. The number of firings were 3, 5 and 7 repeated firings All specimens were observed by SEM and concentration of elements were analyzed quantitatively with EPMA The results of this study were obtained as follows : 1. In the groups of air-treatment, concentration of Sn were the highest and widest. A high concentration of In were in the groups of vacuum and air treatment. 2. There were no significant differences in concentration of Sn between the group of vacuum, 5 minutes hydrofluoric acid and double heat treatment. (p>0.05) 3. As the period of time of hydrofluoric acid treatment increased, not only were the trace elements reduced but the main components such as Pd and Ag were also reduced. 4. Concentration of Sn and In increased and diffused with repeated firings but 5 repeated and 7 repeated firings groups had no significant differences. (p>0.05) 5. Sn were more concentrated in the group of Ceramco porcelaion powder than Vita porcelain powder. 6. The higher concentration of trace elements in the alloy, the more increasing concentration of Sn and In in the interface.

청년기 한국인의 체표면적과 피부 두겹두께 및 방사선상에 의한 심장크기와 상관관계에 관한 연구

이근우,장진요 중앙대학교 의과대학 의과학연구소 1982 中央醫大誌 Vol.7 No.2

The author has measured the body surface areas by DuBois' formula, triceps, subscapular and suprailiac skinfold thicknesses and hearts on teleroentgenogram by Moritz method in 221 male and 158 female Korean students to determine their parameters and calculated the correlation coefficients among those items. The following conclusions were drawn from the study. 1. The averages of the body surface area were 16427.3㎠ in male and 14704.8㎠ in female. 2. The correlation coefficients between the body surface area and the stature were 0.42 in male and 0.36 in female. 3. The correlation coefficients between the body surface area and the chest girth were 0.57 in male and 0.42 in female. 4. The correlation coefficients between the body surface area and the body weight were 0.95 in male and 0.94 in female. 5. No correlation between the body surface area and skinfold thickmesses were found in male, but the coefficients of 0.20 to 0.39 were generally indicative of moderately correlated condition in female. 6. No correlation between the body surface area and % fat were found in both sexes. 7. No correlation between the body surface area and the heart measurements were found in male, but the coefficients of 0.21 to 0.58 were generally indicative moderately correlated condition in female.

經濟史的 側面에서 본 産業革命에 관한 論爭

李瑾雨 진주교육대학교 1980 論文集 Vol.21 No.-

態澤蕃山의 經濟思想에 대한 考察

李根雨 서울대학교 동양사학과 1982 서울大 東洋史學科 論集 Vol.6 No.-

동아시아사 교과서 서술 내용에 관한 제언 - 동아시아의 문자 ‘한자’를 중심으로 -

이근우 동북아역사재단 2013 東北亞歷史論叢 Vol.- No.40

Chinese characters, Buddhism, Confucianism, and law codes are always mentioned as the common elements of East Asian culture. But in the East Asian History textbook for high-school students, there is no chapter on Chinese characters despite the fact that Chinese characters deeply influenced the cultures and writing systems in the East Asian countries of Korea, Japan, and Vietnam. Chinese characters spread with Buddhism, Confucianism, and law codes. And they were a vehicle of these cultural elements and the main vehicle for reading and writing in East Asian countries before modern times. Each of these three countries produceda unique writing system using Chinese characters, such as idu (吏讀) in Korea, kana (假名) in Japan,and chunom in Vietnam. Chinese characters have three aspects, form,sound, and meaning. Japan made simple syllabicscripts using the form. But Vietnam made very difficult characters using the form, the sound,and the meaning of Chinese characters. But these characters were common in using the Chinese characters. By some measures, Hunminjungeum (訓民正音) was devised as a phonetic alphabet for Chinese characters. It was very difficult for common people to learn Hunminjungeum easilybecauseHunminjungeum was written in Chinese and was described with phonological theory that was almost useless for ordinary life and that was above their comprehension. That Hunminjungeum was a subject for state examinations also shows that it was for the educated person. The background for devising Hunminjungeum was the foreign policy and the language policy of Joseon. Words translated from European languages are still used extensively today, and these words shaped commonalities of culture and language among Asian countries. In particular, words translated in Japan during the Meiji period, such as “philosophy” (哲學), “religion” (宗敎), “society”(社會), “individual” (個人), and others, flowed into Korea.

現象學的 倫理學의 價値領域에 관한 考察

李瑾雨 진주교육대학교 1979 論文集 Vol.19 No.1

「아담·스미드」의 道德哲學體系에 관한 小考

李瑾雨 진주교육대학교 1982 論文集 Vol.25 No.1

상속세 및 증여세법상 비상장주식의 평가에 관한 연구

李根雨 동국대학교 2005 大學院硏究論集-東國大學校 大學院 Vol.35 No.-

Because the increment, which was evaluated by a supplemental valuation method for unlisted stocks, is the crucial element that dominates the size in tax burden, it has been raised many questions about how properly the actual value in true stocks can be appraised. And aiming to defuse this, regulations related to inheritance and gift tax has been revised over several times in the meantime, but it is a real situation that the argument surrounding the valuation on properly stock value is still being continued. Accordingly, the purpose of this study is to seek for the institutionally improvement plan for the problem about a supplemental valuation method of unlisted stocks, which is now being enforced. First, because the past actual results fail to normally reflect the future value, in a bid to reduce a predictive error in future profitability, it needs to be expanded the weighted average of the times in the presently net profit or loss value from 3 years to 5 years, and to be presented the extra standard that is able to appraise the future profit value with the past business showings in the long term. And contingent profit and loss (special profit and loss), which is the unusual item exceptionally occurring in the specific year, needs to be excluded in case of calculating net profit or loss value. Second, by selecting the normal corporation appropriate for small-medium companies, through dividing by scale and by business category, with data in the report of corporate tax for listed companies or corporations listed to association, and by calculating net profit or loss, and then by reversely operating the capitalization rate with the stock price of the chosen companies, it is seen to be needed to seek for a plan to notify by scale and business category every one year in terms of the capitalization rate, which was proportionally increased by additionally considering a point that the unlisted companies are generally more inferior than sovereign listed companies, in terms of a risk factor in companies. Third, in applying a premium rate to the maximum stockholders, under the situation of being insufficient in the logical basis of the size in a premium rate, it is seen to be more rational in differentially applying a premium rate by further segmenting the stock-holding rate by stage, other than uniformly applying by dividing into two stages with whether or not being more than 50% of ownership. Fourth, it is thought to be required to get rid of contradiction that the company, which did not suffer loss actually, is appraised more lowly than the company with deficit, by allowing the value per one stock to be appraised with the value that discounted a certain rate from net-asset value in case the value in net profit or loss is less than “0,” and by allowing the value per one stock to be appraised only with net-asset value in the section that the net profit or loss value is more than “0”~less than net-asset value. Fifth, it needs to be presented the guideline that can block the voluntary intervention when Credit Rating Agencies appraise the estimated profit by correspondingly applying provisions for duties of undertaking marketable securities, and to be arranged the rules that can restrain Credit Rating Agencies in case of evaluating by violating this, thus it is thought to need to be protected the right of taxation by intercepting voluntary intervention of them, and to be arranged the independent regulation for calculation of the estimated profit in the long term. Sixth, under the current system that is appraising the value per one stock with the weighted average value in the net-asset value and the net profit or loss value, the franchise value, which corresponds to the excessive profitability, is already included in the net profit or loss value, thus aiming to avoid the problem of overlapping calculation, it needs not to be included the franchise value, which corresponds to excessive profitability, in the process of calculating the net-asset value.

아담ㆍ스미드의 倫理와 經濟의 問題 : 利己心과 利他心의 調和를 中心으로 With Special Reference to the Harmony of Self-Interst and Altruistic Mind

李瑾雨 진주교육대학교 1981 論文集 Vol.1981 No.23