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최현규,김혜민,최순열,김경근,최순호,Choi Hyun-Kue,Kim Hae-min,Choe Soon-Youl,Kim Kyung-Kun,Choi Soon-Ho 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.1
Generally. in the molecular dynamics simulations. the Verlet neighboring list algorithm is used for the reduction of a simulation time On the other hand. the application of the Verlet neighboring list forces the time evolution of a simulation system to follow an unrealistic path in a phase space. In equilibrium state, it does not matter with the simulation results because the individual molecule's motion is originally random and any effect due to a small deviation from a real time evolution can be completely ignored. However, if an unsteady state is involved. such a deviation may significantly affect to the results. That is, there is a Possibility that the simulation results Provide ones with any misleading data In this study we evaluated the effect due to the Verlet neighboring list in performing the simulation of a non-equilibrium state and suggested the method to avoid it.
최현규(Hyun-Kue Choi),최순호(Soon-Ho Choi),최순열(Soon Youl Choe),김창복(Chang fu Kim),김경근(Kyung Kun Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A state of equilibrium means that the thermophysical properties must be equal no matter where a measurement is performed in a system. However, some recent studies reported that there exists the temperature difference over a liquid-vapor interface even though the system is at a state of equilibrium when a system reduces to a nanoscalesize. Those conclusions leave a strong question as to whether the definition of a thermal equilibrium state should be changed in the case of nanoscale systems. In the present study, we carefully investigated the temperature profile over a liquid-vapor interface using the molecular dynamics (MD) simulation and found that the temperature difference between a liquid phase and a vapor phase over an interface resulted from the methodological difference of the temperature calculation. That is, the definition of a thermal equilibrium state has no reason to be changed no matter how a system would be small.
최현규(Hyun Kue Choi),문수범(Soo Bum Moon),최순열(Soon Youl Choe),최순호(Soon-Ho Choi),김경근(Kyung Kun Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
An ejector driven by a liquid is a fluid transfer equipment to be used under a poor suction condition, which means that there exists a possibility to occur a cavitation. It is a highly reliable device because it has no movable part in it, that is only a passive equipment. The ejector is an inevitably necessary one to overcome a poor pumping condition and to mix uniformly two fluids, however it has a low efficiency since it requires a pump for its operation. This study is for the development of a new-type liquid ejector with the application of a nozzle shape alteration, which maximize the suction performance of it. which provides the increased competition with the domestic industries. Also, the increased performance opens a new manufacturing method to use a commercial pipes for the production of an ejector, which is based on a trivial loss of a performance. However, this minor loss can be sufficiently compensated by the increased performance of a new-type ejector. Therefore, the developed ejector by this study can considerably reduce the manufacturing time and cost while its performance is largely increased.
崔順烈 군산대학교 1990 群山水産專門大學 硏究報告 Vol.24 No.1
In order to reduce engine troubles during operation and contribute in developing a high reliable marine the author analysed the factors of marine engine and relation equipment troubleas by principal component analysis method. Analysed data are marine engine & relation equipment troubles selected from sea casualties from 1985 to 1988. The results obtained are as follows. 1. It is found damage of the engines major part, troubles of propeller, electric relation equipment and cylinder system occupied considerable proprotion. 2. It is proved the major part of marine engine troubles from corrosion & friction loss and maintenance defect for cylinder, gear train and cooling system, while from manufacture and treatment defect for crank shaft, electric relation equipment system and hull damage defending on engine relation equipment. 3. Crank shaft, gear train and electric relation equipment system disorders come out heavy damage, while propeller, cooling, fuel oil & relation equipment system troubles turn up light damage.
崔順烈 군산대학교 1984 群山水産專門大學 硏究報告 Vol.18 No.3
This study is invested how the air flow of the blower system is effected on the cooling equipment and the cooling area. The following conclusions were obtained experimently. 1.The cooling load of air conditioner is increased nearly in proportion to the suppling air volume through a blower. 2.By increasing of the blower intake grille surface area, the air flow of the aircondition area is increased from 12.22㎥/min. to 46.48㎥'/min. And also the cooling capacity is increased from 6880.1 Kcal/hr. to 21,171.9 Kcal/hr. Therefore, the air volume to supply the air condition area is increased from 11.93㎥/min. to 43.83㎥/min. According to the above results, the number of air circulation is increased from 2.2 times to 8.2 times per hour. Also the average room temperature is controlled from 25.23℃ to 21.68℃. It is improved to the living condition and cooling capacity.
燃料節減을 위한 Propeller 回轉數와 Propeller pitch角의 組合에 관한 小考 : 全北 402號를 中心으로
崔順烈 군산대학교 1988 群山水産專門大學 硏究報告 Vol.22 No.1
For minimizing the fuel oil consumption at sea, I have investigated the various datum between the propeller RPM and the pitch angle of propeller for the training ship of M. S Jeon Buk 402. To examine the problem, the pitch angle of propeller was changed from 9。 to 12。and The propeller RPM was changed in 480, 505, 530, 555 and 580 RPM. Th results are as follows. 1.The specific fuel oil consumption(kg/h.m) is the smallest on occasion of propeller RPM 480 and the pitch angle of propeller 9。. 2.The specific fuel oil consumption was shown the smallest increasing rate on the case of the propeller RPM 530∼555 and the pitch angle of propeller 12。. 3.To increase the constant ship speed, the fuel oil consumption is always smaller on the occasion of increasing of propeller pitch angle than increasing of propeller RPM.
徐萬錫,李文燦,崔順烈 군산대학교 1989 群山水産專門大學 硏究報告 Vol.23 No.2
The maritime accidents of vessel were investigated by using the maritime Inquiry courts data in korea from 1979 to 1987. The main results of the studies are summarized as follows. 1.The reason of the maritime accident were occured mainly on account of the operational fault (58%), Inferiority repair of engine equipment(21%), and unskilled temperament of seaman. 2.The type of the maritime accidents were collision(32%), engine trouble(18%), around(17.5%), foundering(12%) in order. 3.The accidents rates by the type of vessel were showed fishing vessel(46.9%), cargo vessel(32.6%), tankers(6.5%), passenger boat(4.7%) respectively. 4.As the restricted visibility, the accidents were occured between 8PM and 8AM(56%) in time, and more than 100G/T(39%) vessel.