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DC 비접지 급전계통 선택차단형 통합보호계전기 시뮬레이터 개발 및 알고리즘 테스트
안태풍(Tae-Pung An),윤준석(Jun-Seok Yun),정태영(Tae-Young Jung),김인웅(In-Woong Kim),정호성(Ho-Sung Jung) 대한전기학회 2012 전기학회논문지 Vol.61 No.6
In recent years, a lot of research was done for earth fault protection in ungrounded dc power supply system. As a result, selective-breaking integrated protective relaying system is developed in progress and is currently field-testing are planned. Algorithm on a PC using PSCAD done a lot of testing before performing field tests, but in this study developed algorithms and functions needed to determine whether they were operating normally. Therefore, simulated system is similar to the actual situation was required and made. selective-breaking algorithm verification and validation was performed with simulator.
DC 급전계통 선택차단형 통합보호계전기 보호요소 IEC 61850 Logical Node 설계
정태영(Tae-Young Jung),윤준석(Jun-Seok Yun),김인웅(In-Woong Kim),안태풍(Tae-Pung An),정호성(Ho-Sung Jung),김진호(Jin-Ho Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
There are several protective relays used to protect DC traction power supply system for DC railway. These relays, however, are made by different manufactures and they have different ways for their operations. Therefore, there are difficulties for cooperation between the devices or the devices and an upper system. In order to increase interoperability and stability of the system composed of devices made by different manufactures, IEC 61850 international standards are applied to design logical nodes for modeling protective elements used in protective relays.
안태풍(Tae-Pung Ahn),박철원(Chul-Won Park) 대한전기학회 2017 전기학회논문지 P Vol.66 No.1
In order to advance and improve the performance of domestic aged power plants, IEDs have been developed for power generation systems. For smooth installation and operation of the protection relays, a detail settings study of IED is required. This paper deals with an analysis based on PSCAD and setting investigation of IED for loss of field, reverse power protection in Small Hydro Generation System.
High Temperature Durability Amorphous ITO
Tae Dong Jung,Pung Keun Song 한국표면공학회 2012 한국표면공학회지 Vol.45 No.6
Yb-doped ITO (ITO:Yb) films were deposited on unheated non-alkali glass substrates by magnetron cosputtering using two cathodes (DC, RF) equipped with the ITO and Yb₂O₃ target, respectively. The composition of the ITO:Yb films was controlled by adjusting the RF powers from 0 W to 480 W in 120 W steps with the DC power fixed at 70 W. The ITO:Yb films had a higher crystallization temperature (200℃) than that of the ITO films (170℃), which was attributed to both larger ionic radius of Yb<SUP>3+</SUP> and higher bond enthalpy of Yb₂O₃, compared to ITO. This amorphous ITO:Yb film post-annealed at 170℃ showed a resistivity of 5.52 × 10<SUP>?4</SUP> Ωcm, indicating that a introduction of Yb increased resistivity of the ITO film. However, these amorphous ITO:Yb films showed a high etching rate, fine pattering property, and a very smooth surface morphology above the crystallization temperature of the amorphous ITO films (about 170℃). The transmittance of all films was >80% in the visible region.
Shin, Tae-Ha,Lee, Pung-Sok,Kwon, Oh-Seung,Chung, Youn-Bok The Pharmaceutical Society of Korea 2003 Archives of Pharmacal Research Vol.26 No.1
The objective of the present study was to investigate the uptake process of 4-Phenylazobenzoxycarbonyl-Pro-Leu-Gly-Pro-D-Arg (Pz-peptide), a hydrophilic and collagenase-labile pentapeptide, by isolated hepatocytes. For comparison, the uptake of Pz-peptide by Caco-2 cells and colonic cells, two known paracellular routes of Pz-peptide, was also evaluated. A simple and sensitive reversed-phase HPLC assay method using UV detection has been developed. The coefficient of variation for all the criteria of validation were less than 15%. The method was, therefore, considered to be sutable for measuring the concentration of Pz-peptide in the biological cells. Pz-peptide was extensively uptaked into hepatocytes. The initial velocity of Pz-peptide uptake assessed from the initial slope of the curve was plotted as Eadie-Hofstee plots. The maximum velocity ($V_{max}$) and the Michaelis constant ($K_m$) were 0.190$\pm$0.020 $nmol/min/10^6$ cells and 12.1$\pm$3.23 $\mu$M, respectively. The permeability-surface area product ($PS{influx}$) was calculated to be 0.0157 ml/min/10^6$ cells. $V_{max}$ and $K_m$ values for Caco-2 cells were calculated to be 6.22$\pm$0.930 pmol/min/10^6$ cells and 82.8$\pm$8.37 $\mu$M, respectively, being comparable with those of colonocytes (6.04$\pm$1.03 pmol/min/10^6$ cells and 87.8$\pm$13.2 $\mu$M, respectively). $PS_{influx}$ values for Caco-2 cells and colonocytes were calculated to be 0.0751 $\mu$l/min/10^6$ cells and 0.0688 $\mu$l/min/10^6$ cells, respectively. The more pronounced uptake of Pz-peptide by hepatocytes, when compared with Caco-2 cells and colonocytes, is probably due to its specific transporter. In conclusion, Pz-peptide, a paracellularly transported pentapeptide in the intestine and ocular epithelia, was uptaked into hepatocytes extensively. Although Pz-peptide is able to be uptaked into the Caco-2 cells and colonocytes, it is less pronounced when compared with hepatocytes. $PS_{influx}$ values of Caco-2 cells and colonocytes for unbound Pz-peptide under linear conditions were less than 0.4% when compared with that of hepatocytes.
Lee, Pung-Sok,Shin, Dae-Hwan,Lee, Kyoung-Mi,Song, Suk-Gil,Yoo, Hwan-Soo,Moon, Dong-Cheul,Hong, Jin-Tae,Chung, Youn-Bok 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.3
Preclinical studies are currently underway to examine the potential antitumor effects of a 1:1 mixture of acriflavine (ACF; CAS 8063-24-9) and guanosine. Guanosine potentiates the anti-cancer activity of some compounds. However, the effects of guanosine on the pharmacokinetics of ACF in mammals are unknown. Therefore, this study investigated the effects of guanosine on the pharmacokinetics of ACF after administering a 1:1 mixture of ACF and guanosine in rats. The rats were given either 10 mg/kg of the mixture or 5 mg/kg ACF via an intravenous bolus injection; or 30 mg/kg of the mixture or 15 mg/kg ACF intramuscularly. An HPLC-based method, which was validated in this laboratory, was used to analyze the levels of trypaflavine (TRF) and proflavine (PRF) in the plasma, bile, urine, and tissue homogenates. It was found that TRF and PRF were rapidly cleared from the blood and transferred to the tissues after the i.v. bolus or i.m. injection of the combination mixture. Both TRF and PRF were found to be most highly concentrated in the kidneys after the i.v. bolus or i.m. injection, followed by slow excretion to the bile or urine. Guanosine had no effect on the plasma disappearance of TRF or PRF after the i.v. bolus injection, However, guanosine led to a prolongation of the plasma levels of PRF after the i.m. administration of the combination mixture, resulting in a2 fold increase in the bioavailability (BA) of PRF. The concentrations of TRF and PRF in all the tissues examined were similar in the groups given the mixture and ACF. However, guanosine led to a prolongation of the biliary and urinary excretions of both TRF and PRF after the i.v.bolus (1.25 fold) or i.m. (1.5-2.4 folds) injection. These prolonged effects of guanosine on the plasma disappearance or urinary excretion of TRF and PRF might be one reason for the enhanced antitumor effects of ACF. However, more study will be needed to further examine this potential mechanism.
Yim, Tae-Jin,Kim, Sun Young,Yoo, Ki-Pung 한국화학공학회 2002 Korean Journal of Chemical Engineering Vol.19 No.1
Thermally and mechanically enhanced nanoporous silica-polyurethane hybrid aerogel was synthesized by sol-gel processing and low temperature supercritical CO_2 drying. A partially condensed silica solution and a polymeric MDI were used as the raw materials with a tertiary amine as a catalyst and 1,4-dioxiane as a dilution solvent. After the gelation reaction was completed, aged wet hybrid aerogel was dried by a low temperature supercritical CO_2 drying technique. Also, thermophysical characteristics such as density, BET surface area, and thermal conductivity as a function of catalyst ratio and aging time of the synthesized hybrid aerogel were analyzed. It was found that, at a fixed target density, the lowest average pore size of the aerogel, 8 nm, was obtained when the catalyst ratio was 0.1 wt.%. Also, at these conditions, the BET surface area showed the highest surface area, 287.3㎡/g. It was found that with decreasing average pore size and with increasing BET surface area, thermal conductivity tends to decrease. At pressure 1 torr, the sample aerogel showed the lowest thermal conductivity, 0.0184 W/mK.