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최보경 ( Bo Kyung Choi ),최웅기 ( Woong Ki Choi ),국윤수 ( Yun Su Kuk ),김홍건 ( Hong Gun Kim ),서민강 ( Min Kang Seo ) 한국공업화학회 2014 공업화학 Vol.25 No.5
In this paper, the thermal behaviors of expanded graphite(EG)/erythritol composites with different contents of EG were studied. The surface and structure properties of the composites were determined by using scanning electron microscope(SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. The thermal properties were investigated by differential scanning calorimetry (DSC) and thermal conductivity (TC). As experimental results, the thermal conductivityof the composites increased with increasing the EG content. However, the latent heat was somewhat decreased in the presence of EG. We could concluded that EG was highly promising materials for improving the heat transfer enhancement and energy storage capacity of phase change materials (PCMs).
이종국(Jong-Kuk Lee),송태성(Tae-Seong Song),강정민(Jeong-Min Kang),송덕기(Deok-Ki Song),권준범(Jun-Beom Kwon),서중보(Joong-Bo Seo),오화석(Hwa-Suk Oh),전동익(Dong-Ik Cheon),박상섭(Sang-Sup Park),이준용(Jun-Yong Lee) 한국항공우주학회 2021 韓國航空宇宙學會誌 Vol.49 No.4
본 논문에서는 제어모멘트자이로 내 짐벌과 모멘텀 휠의 제어로직에 대해 기술하였다. 우선 소모전력과 안정도(이득여유, 위상여유)를 고려하여 모멘텀 휠의 제어로직을 설계하였다. 두 번째로는 진동흡수장치의 공진과 안정도를 고려하여 짐벌의 제어로직을 설계하였다. 세 번째로는 제어 모멘트자이로에서 발생하는 힘과 토크를 측정하기 위한 장치 구성에 대해 기술하였으며, 네 번째로는 모멘텀 휠과 짐벌의 주파수응답 및 시간응답 시험 결과를 나타내었다. 그리고 마지막으로 제어 모멘트자이로를 통해 발생한 힘과 토크를 실험적으로 측정하여 나타내었다. This paper presents the control logic for the momentum wheel and gimbals in the CMG system. First, the design of the control logic for the momentum wheel is described in consideration of the power consumption and stability. Second, the design of the control logic for the gimbals considering the resonance of the vibration absorber and stability is explained. Third, the measurement configuration for the force and torque generated by the CMG is described. Fourth, the results of the frequency and time response test of the momentum wheel and gimbals are shown. Last, the measurements of the force and the torque generated through the CMG are explained.
대원제약 원클러® 캅셀(Cefaclor 250㎎)제의 생물학적 동등성 평가
천성국,남기원,류재환,김남재,송보완,서성훈,이경태 한국병원약사회 2002 病院藥師會誌 Vol.19 No.2
The bioequivalence of two cefaclor product was evaluated according to the guideline of KFDA. Test product was Dae Won Wonclor® capsules (Dae Won Korea Ltd.) and reference product was Ceclor® capsules(Lily Korea). 16 healthy male volunteers(20~27 years old) were divided into two groups and a randomized 2×2 cross-over study was employed. After 500㎎ of cefaclor was orally administered, blood was taken at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 8, 12 hours after administration and just before administration. Plasma was analyzed for cefaclor and internal standard(cefadroxil) by a sensitive and validated HPLC assay. The pharmacokinetic parameters(AUC_(t), C_(max) and T_(max)) were calculated and ANOVA test was used for the statistical analysis of parameters. Difference in AUC_(t), C_(max) and T_(max) between two products were 11.88, -6.652 and 15.097% respectively. the powers(1-β) and detectable differences(Δ) and confidence interval for AUC_(t), and C_(max) were more than 0.9 and less than 20%, respectively. Although the power of T_(max) was under 0.8 T_(max)s of the two products were not significantly different each other. These results suggest that the bioavailability of Dae Won Wonclor® capsules is not significantly different from that of Ceclor® capules. Therefore, two products are bioequivalent based on the current result.
대원제약 원클러^� 캅셀(Cefaclor 250mg)제의 생물학적 동등성 평가
천성국,남기원,류재환,김남재,송보완,서성훈,이경태 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2002 東西醫學硏究所 論文集 Vol.2002 No.-
Abstract : The bioequivalence of two cefaclor product was evaluated according to the guideline of KFD-A. Test product was Dae Won Wonclor^R capsules(Dae Won Korea Ltd.) and reference product was Ceclo r^R capsules(Lily Korea). 16 healthy male volunteers(20~27 years old ) were dicided into two groups and a randomized 2 × 2 cross-over study was employed. After 500mg of cefaclor was orally administered, blood was taken at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 8, 12 hours after administration and just before administration. Plasma was analyzed for cefaclor and internal standard(cefadroxil) by a sensitive and validated H-PLC assay. The pharmacokinetic parameters(AUC_1, C_max and T_max) were calculated and ANOVA test was used for the statistical analysis of parameters. Didderences in AUC_t, C_MAX and T_MAX between two products were 11.88, -6.652 and 15.097% respectively. The powers(1-β) and detectable differences(Δ) and confidence interval for AUC_t, and C_MAX were more than 0.9 and less Ihan 20%, respectively. Although the power of T_MAX was undee 0.8, T_MAX of the two products were not significantly different each other. These results suggest that the bioavailability of Dae Won Wonclor capsules is not significantly different from that of Ceclor capules. Therefore, two products are bioequivalent based on the current result.
3D Modeling을 활용한 상수도시설물 구조 및 변위측량 사례(Drone+LiDAR)
김보향 ( Kim Bo-hyang ),배승국 ( Bae Seung-kuk ),서경준 ( Seo Kyung-jun ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
Due to the fact that civil structures among water supply facilities are underground structures that store water at all times, deformation and displacement may occur in structures from external forces such as buoyancy, hydraulic and earth pressure. In the case of pipe facilities, the section being constructed in hanging-pipe format on bridge may be deformed and displaced over time by external forces or the amount of water in the pipe. Furthermore, pipe-support separation may occur. If the structure’s deformation or displacement is more than acceptable, it can effect the safety and functionality of the structures. Therefore, This study examined the structure’s behavior with structural and deformation measurement using Drones and LiDAR.
이종국(Jong-Kuk Lee),송태성(Tae-Seong Song),강정민(Jeong-Min Kang),송덕기(Deok-Ki Song),권준범(Jun-Beom Kwon),서중보(Joong-Bo Seo),오화석(Hwa-Suk Oh),전동익(Dong-Ik Cheon),홍영곤(Young-Gon Hong),이준용(Jun-Yong Lee) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.11
‘제어모멘트자이로’ 내 모멘텀 휠의 속도가 커지게 되면 질량 불균형으로 인해 발생하는 의도하지 않은 힘과 토크가 증가하게 된다. 그리고 이러한 힘과 토크는 위성을 통해 촬영된 SAR 영상의 떨림을 유발하기 때문에 최소화하여야 한다. 본 논문에서는 ‘제어모멘트자이로’ 내 모멘텀 휠의 질량불균형(정적질량불균형과 커플질량불균형)의 보상에 대해서 기술하였다. 우선 M&S를 통해 질량불균형의 발생에 따른 질량중심점에서 발생하는 힘과 토크의 발생을 예측하였다. 두 번째로는 힘과 토크의 측정 지점을 회전 중심에서 이격하였을 때, 질량불균형에 따른 힘과 토크의 발생을 예측하였다. 세 번째로는 질량불균형으로 인해 발생하는 힘과 토크를 측정하기 위한 장치 구성에 대해 기술하였으며, 네 번째로는 실제 구동하는 모멘텀 휠에 지정된 질량을 추가하였을 때, 힘과 토크의 변화량을 M&S와 비교하여 기술하였다. 그리고 마지막으로 이러한 분석을 바탕으로 24Nm급 ‘제어모멘트자이로’를 대기모드로 구동하였을 때의 보정 전과 후의 힘과 토크 변화를 기술하였다. Raising the speed of the momentum wheel in the CMG increases the unintended force and torque caused by mass imbalance. This unintended force and torque should be minimized to get the better quality of satellite SAR image because they lead to the vibration of the output image. This paper shows the works on compensating the static imbalance and couple mass imbalance in the CMG wheel. First, the force and torque at the center of mass generated by the mass imbalance were predicted through M&S analysis. Second, the force and torque were estimated similarly through the M&S analysis when the measurement point was moved from the rotation center. Third, the measurement configuration for the force and torque by the mass imbalance was described. Fourth, the change of the force and torque by adding the specified mass to the momentum wheel was observed after comparing the measurements with the results of the M&S. And finally, the effect of the compensation was analyzed by comparing the force and torque before and after the correction while 24Nm class CMG was running in the standby mode.
He-Ryeon Min,Bo Young Jeon,Ha Na Seo,Min Ju Kim,Jun Cheol Kim,Joon Kuk Kim,Doo Hyun Park 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.6
Electric polarity of working electrode and counter electrode was periodically switched at the intervals of 30 sec. Electric current generated by anodic and cathodic reaction of working electrode was reached to +30 and -12 ㎃ in low intensity pulsed electric field (LIPEF). The yeast growth, ethanol production, and malate consumption in the initial cultivation time were more activated in the LIPEF than the conventional condition (CC). Polyphenol, total phenolic contents (TPC), and total flavonols (TF) were gradually decreased in all cultivation conditions during incubation for 2 weeks but antioxidation activity was not. TF was significantly lower in 3 and 4 V of LIPEF than CC and 2 V of LIPEF; however, the polyphenol, TPC, and antioxidation activity were a little influenced by the LIPEF. After ripening of the winemaking culture for 15 days, polyphenol, TPC, and TF were a little increased but the antioxidation activity was not.
국가기상위성센터 영상처리 시스템 구축을 위한 국내외 기상위성 영상처리 시스템 아키텍처 분석
국승학 ( Seung Hak Kuk ),서용진 ( Yong Jin Seo ),김현수 ( Hyeon Soo Kim ),사공영보 ( Young Bo Sakong ),이봉주 ( Bong Ju Lee ),장재동 ( Jae Dong Jang ),오현종 ( Hyun Jong Oh ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1
본 논문에서는 기존에 구축되어있는 위성영상처리 시스템의 구축현황을 살펴보고, 향후 국내 기상위성 영상처리 시스템 구축에서 고려해야 할 사항에 대해 살펴본다. 기존의 위성영상처리 시스템은 운영중인 개별 위성에 대한 영상의 수집, 처리, 배포 기능을 구현한 시스템이 대부분이었다. 그러나 향후 지구환경 감시를 위한 다양한 위성들의 개발에 따른 새로운 시스템의 통합, 기존 시스템에 대한 유지보수에 대한 문제점이 지적되고 있다. 미국의 NOAA, NWS, 유럽의 ESA등에서는 이러한 문제점을 해결하기 위해 기존의 시스템에 대한 개선 사업을 진행 중에 있다. 이에 본 논문에서는 현재 국내외에서 개발되는 위성영상처리 시스템의 구축 현황을 살펴보고, 개발 이슈 및 개발 전략에 대해 살펴보고자 한다. In this paper, we have surveyed the existing architectures of the image processing systems for several meteorological satellites and identified issues which are taken into consideration to construct the advanced meteorological satellite image processing system that is being developed by NMSC (National Meteorological Satellite Center). Most of the existing systems provide the functionalities of the image acquisition, the image processing, the data management, and the data dissemination. Those systems have some common problems with respect to system integration and system maintenance. To solve these problems, NOAA, NWS and ESA suggest new system architectures to improve the existing systems. This paper introduces domestic and foreign approaches to build the satellite image processing systems and studies some issues and strategies for developing those systems.