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Gas holdup and gas-liquid mass transfer in three-phase circulating fluidized-bed bioreactors /
Son, Sung Mo,Kang, Suk Hwan,Kang, Tae Gyu,Song, Pyung Seob,Kim, Uk Yeong,Kang, Yong,Kang, Hyoung Ku The Korean Society of Industrial and Engineering C 2007 Journal of industrial and engineering chemistry Vol.13 No.1
Ku-Hyun Kang,Seung-Jae Lee,Byung-Chan Song,Hyoung-June Kim,Seung-Eui Nam 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.6
We propose a novel method that applies an alternating magnetic eld during crystallization annealing in an alternating magnetic eld crystallization (AMFC) system for lowering the process temperature of metal-induced lateral crystallization (MILC). We think that the enhanced crystallization is associated with the electric eld generated by the magnetic eld inside the solenoid coil in the AMFC system. Thus, we investigated the MILC rate by using various coil currents to change the magnetic eld. We conrmed that the processing temperature of MILC was reduced to under 510 C and that the MILC rate was accelerated with increasing alternating magnetic eld. We conclude that migration of the NiSi2 phase toward the amorphous Si region may be enhanced by the alternating magnetic eld.
Evaluation of Embryotoxic Potential of Olaquindox and Vitamin A in Micromass Culture and in Rats
Kang, Hwan-Goo,Ku, Hyun-Ok,Jeong, Sang-Hee,Cho, Joon-Hyoung,Son, Seong-Wan Korean Society of ToxicologyKorea Environmental Mu 2010 Toxicological Research Vol.27 No.3
Limb bud (LB) and central nerve system (CNS) cells were prepared from 12.5 day old pregnant female Crj:CD (SD) rats and treated with olaquindox and vitamin A. Cytotoxicity and inhibition on differentiation were measured in each cell. Three doses of olaquindox (4, 21 and 100 mgkg), and 0.2 and 75 mg/kg of vitamin A were administered to pregnant rat for 11 days from $6^{th}$ to $16^{th}$ of pregnancy. $IC_{50}$ values of olaquindox for proliferation and differentiation in CNS cell were 22.74 and $28.32\;{\mu}g/ml$ and 79.34 and $23.29\;{\mu}g/ml$ in LB cell and those values of vitamin A were 8.13 and $5.94\;{\mu}g/ml$ in CNS cell and 0.81 and $0.05\;{\mu}g/ml$ in LB cell, respectively. Mean body weights of pregnant rats were decreased at high dose of olaquindox (110 mg/kg) but relative ovary weight, number of corpus lutea, and number of implantation were not changed. Resorption and dead fetus were increased at high dose of olaquindox, and relative ovary weight, the number of corpus lutea and implantation, and sex ratio of male to female were not significantly changed in all dose of olaquindox. Mean fetal and placenta weights were significantly (p < 0.01) decreased in rats of high group. Seven fetuses out of 103 showed external anomaly like bent tail, and 10 out of 114 fetuses showed visceral anomalies at high group. The ossification of sternebrae and metacarpals were significantly (p < 0.01) increased by low and middle dose of olaquindox but it was significantly (p < 0.01) prohibited by high dose of olaquindox. In rats treated with vitamin A, the resorption and dead fetus were increased by high dose. Mean fetal weights were significantly (p < 0.01) increased by low dose but significantly (p < 0.01) decreased by high dose. Thirty four fetuses out of 52 showed external anomaly; bent tail (1), cranioarchschisis (14), exencephaly (14), dome shaped head (22), anophthalmia (15), brcahynathia (10) and others (19). Forty five fetuses out of 52 showed soft tissue anomaly; cleft palate (42/52) and anophthalmia (22/52) by high dose of vitamin A. Sixty one fetuses out of 61 (85.2%) showed skull anomaly; defect of frontal, partial and occipital bone (21/61), defect of palatine bone (52/61) and others (50/61). In summary, we support that vitamin A is strong teratogen based on our micromass and in vivo data, and olaquindox has a weak teratogenic potential in LB cell but not in CNS cell. We provide the in vivo evidence that a high dose of olaquindox could have weak embryotoxic potential in rats.
康仁準,張容久,郭載河,鄭載衡 부산대학교 공과대학 1993 工大論文集 Vol.45 No.-
Geo-Spatial Information is divided into positional information and attribute information. Up to now, positioning has been fixed by triangulation, traverse surveying and astronomy surveying. Also, satellites are used in position fixing. Road information can be obtained consecutively along the roads. Digitizing from existing maps has been used in obtaining road information. But the roads in existing maps cannot be updated rapidly. Therefore, it is difficult to get informations about new construction roads. This study concentrates on the method of how to use GPS data in the obtaining of road information. There were some errors in comparing the real roads in scale 1:5,000. The errors are caused by the narrow sight angle of satellites.
강연구(Kang, Youn-Ku),유영선(Ryou, Young-Sun),김영화(Kim, Young-Hwa),성문석(Sung, Moon-Seok),김종구(Kim, Jong-Koo),장재경(Jang, Jae-Kyoung),이형모(Lee, Hyoung-Mo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The districts of underground geologic structure in Jeju island where underground air is distributed are lava cave, pyroclastic, open joint, and crushing zone. Such districts are identified to secure an enough airflow when air ventilation layer is to secure 25-35m in depth. In Jeju, Ground air is used for heating greenhouse and fertilizing natural CO₂ gas by suppling directly into greenhouse. But the heating method by suppling ground air into greenhouse directly bring about several problem. The occurrence of disease of the crops by high humidity is worried because the underground air which becomes discharge from underground air layer has over 90% relative humidity. The underground air is inadequate in heating for crops which need high temperature heating such as mangos, Hallbong and mandarin orange because the temperature of it is 15{sim}18?C. Also There is worry where the ventilation loss becomes larger because the air pressure inside greenhouse is high by supplying underground air directly. In this study the heat pump system using underground air as heat source was developed and heating performance of the system was analysed. Heating COP of the system was 2.5~5.0 and rejecting heat into greenhouse and extracting heat from underground air were 40,000~27,000 kcal/h, 30,000~18,000 kcal/h respectively.