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이동호,이승호,정시련,노재섭,이경순,Lee, Dong-Ho,Lee, Seung-Ho,Chung, See-Ryun,Ro, Jai-Seup,Lee, Kyong-Soon 한국생약학회 1995 생약학회지 Vol.26 No.4
Twelve phenolic components were isolated from the aqueous acetone extract of the leaf of Cornus controversa H. (Cornaceae). On the basis of chemical and spectroscopic evidence, the structures of these components were established as gallic acid, $1-O-galloyl-{\beta}-{_D}-glucose$, $1,6-di-O-galloyl-{\beta}-{_D}-glucose$, $1,2,3-tri-O-galloyl-{\beta}-{_D}-glucose$, $1,2,6-tri-O-galloyl-{\beta}-{_D}-glucose$, 3,4,6-tri-O-galloyl ${_D}-glucose$, eugeniin, gemine D, quercetin, quercitrin, hyperoside and rutin.
이동호,최경아,Dongho Lee,Kyoungah Choi 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5
The utilization of crowdsourced spatial data has been actively researched; however, issues stemming from the uncertainty of data quality have been raised. In particular, when low-quality data is mixed into drone imagery datasets, it can degrade the quality of spatial information output. In order to address these problems, the study presents a methodology for automatically validating the geometric quality of crowdsourced imagery. Key quality factors such as spatial resolution, resolution variation, matching point reprojection error, and bundle adjustment results are utilized. To classify imagery suitable for spatial information generation, training and validation datasets are constructed, and machine learning is conducted using a radial basis function (RBF)-based support vector machine (SVM) model. The trained SVM model achieved a classification accuracy of 99.1%. To evaluate the effectiveness of the quality validation model, imagery sets before and after applying the model to drone imagery not used in training and validation are compared by generating orthoimages. The results confirm that the application of the quality validation model reduces various distortions that can be included in orthoimages and enhances object identifiability. The proposed quality validation methodology is expected to increase the utility of crowdsourced data in spatial information generation by automatically selecting high-quality data from the multitude of crowdsourced data with varying qualities.
이동호,신영산,송진호,위재경,이정민,설재수,Lee, Dong-Ho,Shin, Young-San,Song, Jin-Ho,Wee, Jae-Kyung,Lee, Jeong-Min,Seol, Jae-Soo 한국음향학회 2012 韓國音響學會誌 Vol.31 No.5
본 논문에서는 다중 전압을 사용하는 초소형 시스템 구성 및 모듈 설계 방법론을 제시한다. 특히 잡음에 취약한 아날로그 IC의 특성을 개선하기 위한 PDN 구성 방법과 필터 구성 방법에 중점을 두어 설계하였다. 이에 제작된 모듈은 고전압에 의한 잡음을 방지하기 위해 공급 전원별로 접지면을 분할하고, 이를 공통 접지면으로 구성하기 위해 필터를 연결하였으며, via stitching 기법을 사용하였다. 이를 본 논문에서는 PDN 구조를 Lumped 모델로 구성하여 시뮬레이션을 통해 분석하고, 측정을 통해 확인하였다. 시뮬레이션 결과 4.7 uH의 Inductor를 연결하였을 때, 공통 접지면을 사용했을 때보다 -7 dB의 잡음 감소 효과를 확인할 수 있었고, 측정 결과 약 12 %가 감소하였음을 확인할 수 있었다. This paper suggest configuration method of small-size system and design method of module using multi power. In particular module designed to focus on PDN(Power Distribution Network) and filter configuration method to improve the characteristics of noise sensitive analog IC. For the prevention of high-voltage noise, manufactured module is used the ground-isolated technique and via stitching, and is connected grounds with a series of filters. In this paper, so we analyzed PDN structure through the simulation using lumped modeling and confirmed through measurement. Simulation results, when connecting 4.7uH inductor, we made certain that noise of -7dB decreases much more than when it did not. And it was confirmed 12% less than Background Noise.
환형 캐스케이드 내 고정된 터빈 블레이드 및 슈라우드에서의 열/물질전달 특성 (II) - 끝단 필 슈라우드 -
이동호,조형희,Lee Dong-Ho,Cho Hyung Hee 대한기계학회 2005 大韓機械學會論文集B Vol.29 No.4
Experiments were conducted in a low speed stationary annular cascade to investigate local heat transfer characteristics on the tip and shroud and the effect of inlet Reynolds number on the tip and shroud heat transfer. Detailed mass transfer coefficients on the blade tip and the shroud were obtained using a naphthalene sublimation technique. The turbine test section has a single stage composed of sixteen guide vanes and blades. The chord length and the height of the tested blade are 150 mm and about 125 mm, respectively. The blade has flat tip geometry and the mean tip clearance is about $2.5{\%}$of the blade chord. The inlet flow Reynolds number based on chord length and incoming flow velocity is changed from $1.0{\times}10^{5}\;to\;2.3{\times}10^{5}.$ to investigate the effect of Reynolds number. Flow reattachment after the recirculation near the pressure side edge dominates the heat transfer on the tip surface. Shroud surface has very intricate heat/mass transfer distributions due to complex flow patterns such as acceleration, relaminarization, transition to turbulent flow and tip leakage vortex. Heat/mass transfer coefficient on the blade tip is about 1.7 times as high as that on the shroud or blade surface. Overall averaged heat/mass transfer coefficients on the tip and shroud are proportional to $Re_{c}^{0.65}\;and\;Re_{c}^{0.71},$ respectively.