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.

主枝의 方向, 結果母技의 位置 및 굵기가 葡萄의 葉, 新梢, 果粒, 果房의 生長에 미치는 影響

陳英旭 順天大學校 1984 論文集 Vol.3 No.1

This experiment was conducted to investigate the effects of the direction of main branches and the position, and diameter of fruiting mother branches on the growth of the leaf, shoot, berry, and cluster of Campbell Early grapes. 1. Seasonal growth of the grape shoot showed a double sigmoid curve at the turning point on june, 9 and the final shoot lengths of the East Main Branch (E.M.B;i87.4cm) and the ar-Large Size Branch (L.S.B;190.0cm) of fruiting mother branches were longer than those of the West Main Branch (W.M.B;176.4cm) and the Small Size Branch (S.S.B;174.0cm) of fruiting moter branches. But the difference betwen the shoot lengths by the position of fruiting mother branches did not show statistical significance. Seasonal changes of the shoot diameter did not show significance but the enlargement of it decreased slowly from July, 14. 2. The average of leaf length and width did not show significance but those of the E.M.B, the Terminal Position Branch (T.P.B) of fruiting mother bran ches, and L.S.B were big. And the of the length it according to phyllotaxis was large in order of the middle part, the upper part, and the lower part, The 5th leaves were the biggest of then all. The total leaf areas of the E.M.B (5206.8㎠) and the L.S.B (5154.3㎠) were larger than those of the W.M.B (4978.8㎠) and the S.S.B (5031.3㎠). The difference between the total leaf areas by the position of fruiting mother branches did not show significance. 3. Seasonal growthe of the grape berries followed a double sigmoid curve pattern. The diameters of the grape berries at harvesting stage showed statistical difference by the size of fruiting mother branches. 4. The fruit weights of the grape berries in the W.M.B (5.92g) were heavier than that in the E.M.B (5.77g). Also, the difference between the fruit weights by the size of fruiting mother branches and the reciprocal effect (The direction of main branches by the size of fruiting mother branches) showed statistical significance but that according to the position of fruiting mother branches did not. The cluster weights did not show statistical significance by the direction of main branches and the position of fruiting mother branches but those of the L.S.B (487.8g) showed a higher tendency than those of the S.S.B (462.7g), 5. The suger contents of the E.M.B (12.5%) and the L.S.B (12.5%) were higher than those of the W.M.B (12.0%) and the S.S.B (12.0%). But the difference between the fruit weights by the position of the fruiting mother branches did not show statistical significance. 6. The growths of the leaf, shoot, berry, and cluster of the grapes showed statistical significance by the direction of main branches and the size of fruiting mother branches but did not show significance by position of fruiting mother braches.

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.

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

植物 生長調節劑 處理가 葡萄 巨峰 品種의 着粒에 미치는 影響

陳英旭 順天大學校 1985 論文集 Vol.4 No.1

葡萄 巨峰 品種의 着粒 增進을 爲한 植物生長調節劑인 PP-333, B-9, Gibberellin의 處理時期, 處理方法, 處理濃度가 着粒에 미치는 效果에 對한 實驗結果를 要約하면 다음과 같다. 1. 處理時期는 植物 生長調節劑의 種類에 따라서 相異하였으며 PP-333은 6月 15日, B-9는 5月 18日, Gibberellin은 6月 1日이 效果的 이었다. 2. 處理方法에 따른 有意差는 認定되지 않았다. 3. 植物 生長調節劑에 따른 着粒의 效果는 B-9區와 Gibberellin區는 Control區보다 높았지만 PP-333區는 낮았다. 4. PP-333은 處理濃度가 높아질수록 着粒率이 낮은 傾向이었다. 5. 巨峰 品種의 着粒 增進을 爲한 PP-333處理는 6月 15日 以後 500ppm 以下의 濃度라고 生覺된다. 6. 植物 生長調節劑의 處理時期, 處理方法, 處理濃度의 相互作用間에는 有意差가 認定되었다. This experiment was conducted to investigate the effects of the different treating time, method and concentration of plant growth regulators such as PP-333, B-9 and Gibberellin, for elevation of berry setting in Kyoho grape. The results are summarized as follows; The degree of berry setting varied according to the treatment time and the kind of plant growth regulators. It s effective treating time was June. 15 in PP-333, May. 18 in B-9 and June. 1 in Gibberellin. 2. There was no significant difference according to the treatment methods. 3. For berry setting of Kyoho grape, treatment of B-9 and Gibberellin was more effective than non-treatment, but that of PP-333 was not. 4. In the case of PP-333, the berry setting rate was lowered as its concentration became high. 5. The concentration of PP-333 has to be decreased under 500ppm for elevation of berry setting rate. 6. In the interaction among the treatment time, method and concentration, there was significant difference.

노인 입원환자의 기능적 장애

진영욱,곽인호,이영진,이혜리,윤방부 大韓家庭醫學會 1989 Korean Journal of Family Medicine Vol.10 No.1

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

승용 디젤엔진용 가변과급기 성능에 관한 연구

진영욱,정진은,조훈기,강우,정재우 한국기술교육대학교 2006 論文集 Vol.13 No.1

A test bench which is consisted of roots blower, air flow meter, driving unit for VGT actuator, transmitters for temperature and pressure, and the rotational speed sensor was developed to evaluate the characteristics of the VGT system. Measurements using VGT of the 2.0 L diesel engine were carried out. The corrected mass flow rate and the pressure ratio for the compressor of the VGT are related directly with the rotational speed, but they are independent of the rack position of the VGT. The pressure ratio and the corrected mass flow rate of the turbine of the VGT are related directly with the rack position of the VGT, but they don't have any relation with the rotational speed. The mechanical efficiency of the VGT is higher than the conventional turbocharger in the wide range. The efficiency at the 0.03 kg/s of the mass flow rate is 4.36 times as high as that of the conventional turbocharger. These data will be used to develop the new engine equipped with the VGT system.

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.