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( Hyung Seok Shim ),( Nong Moon Hwang ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.9
The mystery of Goss selective abnormal grain growth (AGG) in Fe-3%Si steel has long remained unsolved since its discovery by Goss in 1933. Similarly, the mechanism of secondary recrystallization, which is commonly observed in many metallic systems, has long been a puzzle. Here, attempts to solve this puzzle are reviewed with a focus on solid-state wetting along the triple junction of polycrystalline metals. Especially, the grains with sub-boundaries of very low energy exclusively have a high probability to grow by solid-state wetting and as a result can grow abnormally. The 3-dimensional Monte Carlo (MC) and phase field model (PFM) computer simulations showed that the presence of sub-boundaries induces AGG. The existence of sub-boundaries exclusively in abnormally-growing grains was experimentally confirmed in Fe-3%Si steel and in 5052 Al alloy. The time evolution of abnormally growing grains by ex-situ observation and electron backscattered diffraction (EBSD) analysis of 5052 Al alloy clearly revealed many microstructural evidences for AGG by triple-junction wetting. Misorientation angle measurements by EBSD of the grains belonging to the penetrating morphology showed that the penetrated grain boundaries have high energy and the penetrating grain boundaries tend to have low energy, in agreement with the wetting condition along the triple junction. Parallel three-dimensional MC simulations starting with the experimental misorientationdata, which consider sub-boundaries and precipitates, show many realistic AGG features observed experimentally. (Received July 28, 2013)
Yun, Jin‐,Mun,Yeo, Jun‐,Seok,Kim, Juhwan,Jeong, Hyung‐,Gu,Kim, Dong‐,Yu,Noh, Yong‐,Jin,Kim, Seok‐,Soon,Ku, Bon‐,Cheol,Na, Seok‐,In WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42
<P>Solution‐processable reduced graphene oxide as a hole‐transporting layer for highly efficient and stable organic solar cells is reported on page 4923 by Dong‐Yu Kim, Seok‐In Na, and co‐workers. Introduction of a newly reduced graphene oxide by simple solution processing into solar cells dramatically raises the cell efficiency and cell life‐time. The results will allow full use of chemically reduced graphene and will advance the realization of carbon‐based printable optoelectronic devices. </P>
吳錫炯 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1
This study is planned with the variation of temperature that is closely associated with the wear when SUS304 is cut. Since SUS304 is a difficult-to-machine material, tool damage is largely affected by cutting conditions, this experiments investigate the relations between the cutting temperature and the characteristics of tool wear which is being in cutting process. In the results, the characteristics of cutting temperature are related to the difficulty of machining characteristics.
정현석 東西大學校 2000 동서논문집 Vol.6 No.-
This research is concerned with a sensor for detecting the melted oxygen in water. This kind of sensors are used in nuclear power plant(NPP). The melted oxygen can cause the corrosion of pipe line. This means the possibility of disaster of sloping the NPP becomes high. This is the reason for controlling the amount of melted oxygen. But these kind of sensors are imported with high cost and long term delivery. In this research, we developed drawings to make it possible to product oxygen sensors domestically. This result is expected to reduce the cost of maintenance of NPP.
Human Chorionic Gonadotropin(HCG)에 의한 넙치, Paralichthys olivaceus의 배정효과
박인석,김형배,최희정,이영돈,손진기 제주대학교 해양연구소 1992 해양자원연구소연구보고 Vol.16 No.-
For the evaluation of hormonal control of sperm in cultured fish a method to quantify the spermiation response of mature flatfish to hormonal therapy is described. Spermatocrit was determined after 30 min. in centrifuge condition of 12,000rpm. Sperm density was estimated by a standard hemacytometer method. However, sperm density can be predicted from spermatocrit since their relationship is linear as described by the re-gression equation. Y=1.14X-0.04 (r=0.91. P<0.0001. n=50), where Y is spermatocrit and X is sperm density. Sperm density levels ranged from 21.5 to 98.4×10^(4) spermatozoa per ㎕ milt corresponding to spermatocrit values of 12 to 95%. Milt production by mature flatfish was highest (7.4ml per kg body weight) at 24h after injection of 1,000IU of human chorionic gonadotropin(HCG) per kg body weight and coincided with low spermatocrit (63%) and sperm density (67.4×10^(4) spermatozoa per ㎕ milt) levels. No significant differences was appeared in milt production, spermatocrit and sperm density between control and HCG-treated fish at 48h after HCG injection. These results demonstrate that spermiation in mature flatfish can be reliably evaluated by a spermatocrit method and that HCG is effective in stimulating of spermiation in this species.
용존공기부상법(DAF)에서 충돌메커니즘의 영향요인 분석
독고석,이형집 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5
In this research, the theoretical modeling of DAF which was obtained by trajectory analysis has been verified. Especially, the effects of electrostatic nature and particle size of bubble and particle (floc) was focused. To measure the electrostatic nature of bubble, zeta potential measuring setup was made in a well controlled laboratory. The effects of several operational parameters in DAF process are investigated on a system composed of batch DAF reactor, microscope and video system. The effect of pH on the removal efficiency of DAF is presented. The effect of mixing time is presented. The effect of zeta potential of floc and bubbles with the addition of coagulant is presented. It is found that all the phenomena can be explained primarily from the electrostatic nature of bubble and particle and secondarily from the effect of particle size. The findings from this research are compared and verified with the results of DAF modeling by α_bp. This research will be helpful to understand and explain the process better and possibly can be used to modify and improve the DAF process.
편측 폐환기에서 Prostaglandin F2α가 심혈관계에 미치는 영향
양홍석,조형상 중앙대학교 의과대학 의과학연구소 1990 中央醫大誌 Vol.15 No.1
The lung is usually considered to have one function, namely gas exchange. Another function of lung is pharmacokinetic function, which the cells and enzymes of pulmonary vascular bed act to change biological activities of a variety of substances transported to them through pulmonary circulation. The pulmonary vasoconstrictor response to hypoxia is a part of a self-regulatory mechanism by which capillary blood flow is automatically adjusted to alveolar ventilation. Some vasoactive substances mediate the hypoxic pulmonary vascular response, and prostaglandin F2a, which is used for uterine contraction during obstetric surgery, is considered to potentiate the hypoxic pulmonary vasoconstriction. The author investigated the cardiovascular effects of PF2α during one-long ventilation in Korean mongrel dogs. Dogs were anesthetized with pentobarbital, morphine and pancuronium and intubated with Rush endotracheal tube No. 6.5.. One-lung ventilation was induced by deep right endobronchial intubation, which was confirmed by chest movement and abscence of breathing sound in the left lung. Prostaglandin F2α in dose of 0.5, 1.0, 2.0 ㎍/kg/min was infused into peripheral vein. The results were as follows: 1. One-lung ventilation group was compared with control group: The heart rate was decreased and MPAP, PVR and SVR were increased, In blood gas, pH and PO2 were decreased but PvCO_2 and shunt were increased. 2 Prostaglandin F2α infusion groups were compared with one-lung ventilation group: The cardiovascular function and blood gas changes were not effected by prostaglandin F2α, but MPAP was increased with dose-dependent manner and PVR were increased in prostaglandin F2α in doses of 1.0, 2.0㎍/kg/min infusion group. Thus hypoxic pulmonary vasoconstriction was found to be enhanced b usual dose of prostaglandin F2α (0.5 ~ 2.0 ㎍/kg/min).