LNG 증발기체의 재액화 사이클에 대한 열역학 해석

진영욱,문정우,이윤표,장호명 대한설비공학회 2007 설비공학 논문집 Vol.19 No.7

The LNG BOG re-liquefaction system for LNG carriers was designed based on the Claude refrigeration cycle and the thermodynamic analysis was carried out in order to find the design point of the three heat exchangers constituting the system. The thermodynamic analysis revealed that the system state could be defined by the three cold endpoint temperatures of the three-pass heat exchanger. Hence the iso-lines of the specific liquefaction work, taken as the performance indicator, were presented in terms of those three temperatures and discussed. The system was found most economical when those three temperatures approached a single temperature of -140℃ and thus this system state could be taken as the design point for the heat exchangers.

花房 切斷時期 및 程度가 葡萄 巨峰 品種의 生育에 미치는 影響

陳英旭 順天大學校 農業科學硏究所 1990 農業科學硏究 Vol.4 No.-

The experimental results about the effects of thinning time and degree within cluster on the growth and development of vitis labruscana L., var Kyoho grape are summarized as follows: Shoot length and leaf area are not different with cluster thinning, but shoot diameter became larger with the thinning time than by thinning degree, especially when the thinning was treat at full blooming stage the cluster length and width which were 6.5 and 6.9㎝ respectively, were 10.6% better than those of non-thinning, 6.1 and 6.5㎝. Berry setting ratios of 2 weeks before full blooming plot and ½ cluster thinning plot, which was 22.9 and 23.7% respectively, were highest among treatment and berry setting ratios of small berries became higher than that of large berries when the thinning within the cluster was carried. The diameter of berry of as well as the weight of cluster or berry were better with the thinning time earlier and the thinning degree higher, also the tendency is remarkable in small berries than in large berries. Sugar and acid contents are differed with the cluster thinning. The chlorophyll content of leaf was higher in the ½ thinning plot 2.02㎎/g(June, 29), 2.25㎎/g(July, 13) than those of other plot but there it is not significant difference with the thinning time. The contents of inorganic materials in 2 weeks before full blooming plot were highest among treatment. Especially the content of nitrogen was more decreased but the content of P, K, Ca, Mg, and B were more increased, as the thinning degree become higher.

자동차용 Water펌프 설계를 위한 유동해석

진영욱 한국기술교육대학교 산학협동연구센터 2003 교수현장연구학기제 연구결과보고서 Vol.2003 No.1

개방시스템의 손실 일에 관한 연구

진영욱 한국기술교육대학교 2003 論文集 Vol.10 No.1

Work done by a material particle in the absence of thermal interaction with its surrounding medium is given by δω=pd((1)/(ρ))-Τδs_(gen) for a closed system, δω_(s)=-(1)/(ρ)dp-d((υ²)/(2)) -Τδs_(gen) for an open system respectively. The term Τδs_(gen) is called "lost work" and represents a lost opportunity to extract work during the change in state of the material particle. This study focuses on the lost work in an open system where viscous force within the bulk of fluid is the unique factor that renders the process irreversible. In fact the lost work in an open system is viscous dissipation. Noting that viscous dissipation is closely related to the flow pattern, the optimization of the streamline geometry corresponds to the minimization of the lost work or entropy generation, which is the basic idea of this paper. Three flow patterns were chosen and the measures to reduce the lost work were considered.

LNG운반선의 증발기체 재액화 장치의 사이클 해석

진영욱 대한안전경영과학회 2012 대한안전경영과학회 학술대회논문집 Vol.2012 No.04

Cycle analysis has been performed to find out the optimum design point of the BOG re-liquefaction plant. The cycle state, defined by three cycle variables, was mainly described by the three cold temperatures of the three-pass heat exchanger, on which the constraints by the heat exchanger are imposed. The cycle states which are confined within a domain limited by the temperature constraints were the primary issue of this study. The BOG mass within the domain was analyzed first and then the cycle performance was related to the BOG mass afterwards, which enabled us to explain the observed behavior of the cycle performance under the temperature constraints by the heat exchanger. A good cycle performance could be ensured if the two cold Nitrogen temperatures of the three temperatures were placed close together near -140℃ while the BOG temperature is kept far above enough, but not too far, fr

우리나라 果樹 剪定 歷史에 관한 考察

丁判聲,陳英旭 順天大學校 師範大學 附屬 科學敎育硏究所 1993 科學과 敎育 Vol.1 No.-

The training and pruning of tree are very important in pomology. This literatural research is concerned with the history of fruit tree training and pruning. Most old books on agriculture in Korea was published during the Yi dynasty and the first book which described fruit tree training and pruning is considered to be "JONGSUPYON, SANRIM KYOUNGJAE (Fruit Tree section in Forest Economics)" which was written in 1676 - 1704 by Hong, Man Son.

葡萄의 簡易被覆 栽培에 있어서 Film의 種類가 Campbell Early 品種의 生育에 미치는 影響

陳英旭,徐鐘憤 順天大學校 農業科學硏究所 1992 農業科學硏究 Vol.6 No.-

This study was carried out to investigate the effect of covering films for rain shielding on the growthq and development in grape : The daily mean light intensity in the plot covered by EVA film was weaker about 15,600 lux than that of non-covering plot. The daily mean temperature of PE and EVA films plot was higher about 1℃ than that of non-covering plot, but lower 0.5℃ than that of BCR film treatment. The shoot growth expressed by shoot length, shoot diameter, leaf length, leaf width and leaf area was not affected by covering films. The cluster length and diameter measured at 57 days after treatment in the plots covered by PE film which were 18.3 and 9.7㎝ respectively were about 9.9% and 16.9% respectively, larger than those in the non-covering plot. The number of berry dropped was most in May 19. All covering treatment and the total number of berry dropped was most in PE film-covering plot(153.3ea) than in non-covering(123.7ea) and EVA film-covering plot(101.0ea). The droppings of BCR film and EVA film plot were shorter a week than non-covering and PE film plot. Vertical and tranversal diameter of berries in PE film plot were 19.77㎜ and 21.13㎜ respectively and it was larger than that of non-film plot which was 18.87㎜, 19.47㎜. The fresh weight of berry grown under PE film-covering plot was heaviest than any other film covering treatment. Sucrose content of grape grown under film-covering plot was lower than that of non-covering treatment by 14.2% and content of film-covering treatment plot was higher than that of non-covering treatment by 0.74%. Chlorophyll content of film-covering treatment plot was higher than that of non-covering treatment, especially the total chlorophyll content of PE film-covering treatment plot which was 1.69㎎/g, was highest than those of other film treatment. Inorganic substance of leaves varied each other by the kind of covering material and seasonal stage of growth, especially as the plant growth was developed the content of N, P, K and Mg was decreased and the content of Ca, Carbohydrate, the rate of C/N increased.

Cycle Analysis on LNG Boil-off Gas Re-Liquefaction Plant

진영욱 한국초전도.저온공학회 2006 한국초전도저온공학회논문지 Vol.8 No.4

Cycle analysis was performed in order to find the optimum design point of the LNG Boil-off gas re-liquefaction system. Thermodynamic analysis revealed the system could be defined by three state variables. Thus the system performance could be described by the three cold endpoint temperatures of the three-pass heat exchanger. This enabled us to investigate the cycle performance in terms of the heat exchanger parameters. To get access to the cycle states of higher system performances, larger heat exchangers were found necessary. Also the thermal pinch in cryogenic heat exchangers was found to act as a limiting factor to the system performance.

麗川工業團地의 大氣汚染이 落葉果樹의 生育에 미치는 影響 : Ⅲ. 果實品質 및 葉內無機成分 含量變化 Ⅲ. Variation of Fruit Quality and Inorganic Element Contents in Leaves

金恩榮,李英喆,陳英旭 順天大學校 1999 論文集 Vol.18 No.1

大氣汚染物質이 麗川工業團地 周邊地域에 栽植된 落葉果樹의 果實品質 및 葉內無氣成分含量 變化에 대한 調査結果를 要約하면 다음과 같다. 果實品質은 工業團地 周邊地域이 非汚染地域에 비해 低下되는 傾向이었으며 特히 中地域의 밤, 배, 모과는 果重이 非汚染地域의 1/2이하 水準에 불과 하였다. 果種別 葉內 無機成分 含量은 果種別로 差異를 보였지만 工業團地 周邊地域이 非汚染地域보다 낮은 水準이었으며 汚染源에 인접한 地域일수록 減少가 심한 傾向을 보였다. Effects of air pollutants on fruit quality and inorganic element contents in leaves of deciduous fruit tree in yochon Industrial Complex were investigated. The fruit quality grown at the peripheral regions of industrial complex became worse than that at unpolluted regions, and fruit weights of chestnut, pear and chinese quince at the moderate regions of industrial complex were only one half of the unpolluted regions. The inorganic element contents in leaves were different in the different fruits, and those at the peripheral regions of industrial complex were lower level than at unpolluted regions, showing more severe decrease at the peripheral regions of the industrial complex. .

枳殼(탱자)種子의 發芽에 對한 硏究

朴秉昊,陳英旭 順天大學校 1982 論文集 Vol.1 No.1

播種時期및 果實 採取部位에 따른 枳殼의 種子 發芽試驗 結果를 要約하면 다음과 같다. 1. 枳殼의 乳熟期는 7月中旬以前, 黃熟期는 7月下旬부터 9月上旬, 完熟期는 9月上旬以後로 推定된다. 2. 播種時期別 發芽率은 成熟의 進行에 따라 增加되어 8月7日區(97.0%)를 基點으로 점점 낮아진 傾向을 보였다. 3. 播種時期別 發芽期間은 8月2日區(26.7日)가 가장 길었고 9月1日區(8.7日)가 가장 짧았다. 4. 播種後 最初 發芽所要日數는 滿開 26日째 採取 播種한 8月12日區(10.3日)가 가장 짧았고 7月23日區(18.3日)가 가장 길었다. 5. 生長率은 共히 8月17日區(7.0cm, 8.5cm)가 가장 良好하였고 7月21日區(1.5cm, 1.7cm)가 가장 不良하였다. 6. 果實의 採取部位別에 있어서는 發芽率, 發芽期間, 最初 發芽所要日數, 生長率은 큰 差가 認定되지 않았다. The following are the summarized results obtained from an experiment on thd germination of Trifoliate orange seeds by sowing period and friut-picking level: 1) It is assumed that the milk ripe stage of Trifoliate oranges is before the middle of July, the yellow ripe stage of them is between late in July and early in September, and the full ripe stage of them is after the late of September. 2) Germination rate by sowing period showed increasing tendency while ripening was being progressed but showed decreasing tendency (97.0%) from August 7. 3) Germination time by sowing period was longest in the August 2 plot (26.7 days) and shortest in the September 1 plot (8.7 days). 4) The number of days required for the first germination after sowing was least in the August 12 plot (10.3 days) where seeds had been picked and sowed on the 96th day after full bloom, and most in the July 23 plot (18.3 days). 5) The growth rate of the August 17 plot was best (7.0cm, 8.5cm) and that of the July 21 plot was worst (1.5cm, 1.7cm). 6) In fruit-picking level, there was no great difference in germination rate, germination period, the number of days required for the first germination, and growth rate.