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충전율의 변화가 밀폐형 2-상 열사이폰의 열전달 특성에 미치는 영향에 관한 연구
박용주,홍성은,김철주,Park, Yong-Joo,Hong, Sung-Eun,Kim, Chul-Ju 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.12
A two-phase closed thermosyphon was one of the most effective devices in the removing heat because of its simple structure, thermal diode characteristics, wide operating temperature range and so on. In this study, a two-phase closed thermosyphon(working fluid PFC(C6F14), container copper(inner grooved surface)) was fabricated with a reservoir which can change the fill charge ratio. The experiments were performed in the range of 50~600W heat flow rate and 10~70% fill charge ratio. The results were compared with some correlations that were presented by Rohsenow and Immura et al. in the evaporator, by Nusselt, Gross and Uehara et al. in the condenser and by Cohen and Bayley, Wallis, Kutateladze and Faghri et al. in heat transfer limitation etc.. The heat transfer coefficient at the evaporator increased with the input power. However the effect of the fill charge ratio was nearly negligible. At the condenser, it showed an opposite trend to the evaporator and with increase of the fill charge ratio, showed some enhancement of heat transfer. The heat transport limitation was occurred by the dry-out limitation for small fill charge ratio(10%) and presented about 100W. For the case of large fill charge ratio(Ψ$\geq$40%), it was occurred by the flooding limitation at about 500W.
週期的 高蛋白質 給食에 依한 白鼠의 營養效果에 關한 硏究
朴容周,黃祐翊 우석대학교 의과대학 1969 우석의대잡지 Vol.6 No.2
This study was done in order to observe the nutritional effect of the rice diet supplemented with fish flour every one to four days. The protein, lipid and cholesterol contents in liver, serum protein and cholesterol values and hemoglobin and hematocrit values were measured. The animals used for the experiment were adult female albino rats from a pure strain, weighing 239-297g. The animals were divided into five diet groups: the standard diet (control group), the rice diet supplemented with fish flour once every other day group (A group), every two days (B group), every three days (C group) and every four days (D group). Each animal group was redivided into four groups by the length of feeding of each diet; the feeding groups were for fifteen days, thirty days, forty-five days and sixty days. The results obtained are summarized as follows: 1. The protein contents in the livr of the A and the B groups were similar to the value of the control. After feeding of this diet for fourty-five days they were slightly decreased, and those of the C and the D groups were generally decreased, compared with the control group. 2. The protein values in the serum showed no maked change compared with the control group and showed no change with either the type of diet or length of time this diet was given. 3. The lipid contents in the liver of the A and the B groups were increased, compared with the control group, up to thirty days but after forty-five days they were decreased. Those of the C and the D groups were usually increased, compared with the control group regardless of the length of feeding. 4. The cholesterol contents in the liver of each diet group were slightly decreased, compared with the control group for the duration of the study. 5. The hemoglobin and hematocrit values of each diet group (except the A group) were slightly decreased at fifteen days after the feeding of each diet. From the above results it is suggested that the nutritional effect of the low protein diet was most improved by a fish flour supplement given once every other day. It seems likely that shorter the interval of the periodical supplement, greater the nutritional effect.
박용주 동아시아불교문화학회 2014 동아시아불교문화 Vol.0 No.18
The Mūlamadhyamakakārikā(MMK) is Nagarjuna's best known work. This study is designed to analyze pratītyasamutpāda(dependent origination) of Nāgārjuna's Mūlamadhyamakakārikā. Utilizing the Buddha's theory of pratītyasamutpāda, Nagarjuna demonstrated the futility of pratītyasamutpāda's ontological speculations. So many scholars have studied on the Pratītyasamutpāda of Mādhyamika Philosophy of Nāgārjuna. And they make a study by natural language. But the study of pratītyasamutpāda by symbolic language or artificial language is more precise and accurate. So the methodology of this study is propositional logical analysis. The result of propositional logical analysis on pratītyasamutpāda is that MMK's pratītyasamutpāda is known to a material equivalence of pratyaya (condition) and phala(result). Moreover, ‘the logical interrelation of dharmas’ which is said as definition of MMK's pratītyasamutpāda by Nakamura Hajime(中村元) can be expressed by biconditional. In conclusion, MMK's pratītyasamutpāda can be expressed by propositional logic and the propositional logical form of MMK's pratītyasamutpāda is p≡q(p is ‘pratyaya[condition] exist’, q is ‘phala[result] exist’). 『중론』의 핵심개념인 연기(緣起, pratītyasamutpāda)의 의미를 명확하게 밝힘으로써 『중론』 전체의 내용을 명료하게 이해할 수 있는 교두보를 확보하도록 하겠다. 기왕(旣往)에 『중론』 연기에 대해서는 국내외의 많은 학자들에 의해 연구가 진행되어 있고 그 성과가 축적이 되어 있으나 본 논문에서는 이전 연구들과 달리 『중론』 연기에 대해 명제논리(Propositional Logic)적으로 분석하는 방법을 취하고 있다. 기존의 연구자들이 자연언어를 통해 이루어놓은 연기에 대한 이해의 성과 위에 논의의 정밀성과 명확성을 확보하기 위해 명제논리라는 인공언어를 효율적으로 활용하고자 한다. 『중론』의 연기에 대한 명제논리적 분석의 결과 『중론』 연기는 연(緣)과 과(果)의 존재에 대한 실질적 동치(material equivalence)관계를 가리킨다는 것을 밝힐 수 있었다. 이것은 또한 中村元이 『중론』 연기를 ‘법과 법의 논리적 상관관계’라고 했을 때 ‘논리적 상관관계’의 의미가 쌍조건(雙條件, biconditional)으로 표현되는 관계라는 것을 의미하는 것이기도 하다. 그리고 이런 『중론』 연기는 논리적 관점에서 해석한 초기불교의 연기를 계승하고 있는 것이라는 점을 연기공식에 대한 명제논리적 분석을 통해 확인 할 수 있다. 결국 『중론』 연기는 명제논리식으로 표현할 수 있으며 그 구체적인 형태는 ‘연이 있다’를 p로 놓고, ‘과가 있다’를 q로 놓을 때 p≡q라는 것이다.