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황대원,김동표,장희동,김헌창,이병윤 한국공업화학회 2002 응용화학 Vol.6 No.2
Cobalt nanoparticles were synthesized by the hydrogen reduction of cobalt chloride in the gas phase. Concentration of CoCl_2, Reaction temperature, and residence time were chosen as key experimental variables for the control of the particle size. Cobalt nanoparticles ranged from 50 to 90nm in average particle diameter were produced by through all the experiments. As the CoC1_2 concentration in the flame increased, the average particle diameter increased. Average particle diameter increased with the increase of reaction temperature. Smaller particles were produced with decrease of the residence time of reactant in the reaction zone.
샌드위치형 GFRP 아치의 구조적 거동 및 현장 적용성
황대원,김광우,김용성,연규석 한국농공학회 2018 한국농공학회논문집 Vol.60 No.2
This study investigated the structural behavior and field applicability of sandwich type GFRP arches with polymer mortar in core. As a result, in case of crack loading and failure loading, total strains at crown were the highest; the fracture strain at crown was 0.01690, which is 4.2 times greater than the fracture strain (0.004) of cement concrete. The 3 % deflection load was 17.42 kN, the flexural strength was 163.98×10 -3 GPa, and the flexural elastic modulus was 11.884 GPa. From load-deflection relationship up to 3.5 % deflection, 3D analysis results and experimental values were observed to be almost identical. It was considered reasonable to set a deflection rate limit to be 3 % for structural safety purpose. The standard external flexural strength of semicircular arch used in this study was approximately 2.64 times higher than that of hume pipe (2 type standard) and tripled composite pipe. The external pressure strength at fracture was approximately 1.57 times higher than that of hume pipe. It was confirmed that the implementing semicircular arch had mechanically more advantage than the circular pipe. Optimum member thickness was 8~53 mm according to arch radius of 450~1,800 mm and cover depth of 2~10 m. It was found that the larger strength could be obtained even if the thickness of member was smaller than that of concrete structure. In field application study, figures and equations were derived for obtaining applicable cover depth and optimum member thickness according to loading conditions. These would be useful data for design and manufacture of sandwich type semicircular arch.
황대원(Daewon Hwang),정정민(Jungmin Chung),서봉원(Bongwon Suh),서경진(Kyoungchin Seo) 한국디지털콘텐츠학회 2022 한국디지털콘텐츠학회논문지 Vol.23 No.11
As speech and motion play a essential role in communication, studying co-speech gesture is a long-standing research topic. High-quality audio and gesture data are desired in both research and industry fields. However, only English-based audios are available and types of modality are also limited. In this study, we collect and propose 761 hours of Korean-based large-scale co-speech gesture dataset (KLSG) annotated with the multi-modal information, such as multi-view videos, script, emotions, etc. All corresponding data are synchronized with speech audio time. To verify the validity of KSLG dataset, we compared the results of various co-speech gesture generation tasks using KSLG and a benchmark dataset. The result shows that our dataset has similar characteristics with the benchmark dataset when training gesture generation models. A user study also suggests that our dataset contains Korean speech and behavior features.