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"특집 1 : 반계 유형원과 동아시아 초기 실학 : 명말청초의 經史學과 經世學"
손보산 ( Sun Baoshan ) 한국실학학회 2017 한국실학연구 Vol.0 No.34
經史學은 중국 학문의 주체로서 明代에 주류적인 위치를 차지한 것은 아니지만 지속적으로 계승, 발전되어 왔다. 明末淸初에 經史學은 明代의 발전을 이어서 특정한 역사적 단계에서 주요한 학문적 형식이 되었다. 明末淸初의 經史學은 같은 시기에 흥기하였던 經世學과 매우 밀접한 관계를 가진다. 아울러 과거시험의 폐단을 구제하며, 理學의 유폐를 바로잡고, 선명한 經世지향성을 지니며, 經과 史를 밀접하게 결합하여 연구하는 특징을 보인다. The study of Confucian classics and historiography are still inherited and continued in the Ming Dynasty,then have a great development in Late Ming and Early Qing Dynasty,and have four basic characteristics: to remedy the disadvantages of imperial examination, to correct the abuses of Neo-Confucianism, have a strong practical tendency, to closely combine the study of Confucian classics and historiography.
노기덕,Baoshan Zhu,Michihisa Tsutahara 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.2
The Weis-Fogh mechanism, found in the hovering flight of a small bee, is a unique and efficient lift generation. In this study, we proposed a rotating type propulsion model that applies the principle of the Weis-Fogh mechanism and calculated the unsteady flow field of the propulsion model with the advanced vortex method. The wing (NACA0010 airfoil) and channel are approximated by source and vortex panels, and free vortices are introduced away from the body surfaces. The viscous diffusion of fluid is represented using the corespreading model to the discrete vortices. We investigated the thrust and drag coefficients, pressure field, vorticity field, velocity vector field, and average propulsive efficiency of the propulsion model by changing the rotating angle velocity. The force acting on the wing depended heavily on the directions of the thrust and drag and the thrust and drag coefficients largely fluctuated with the change in the rotating angles. The average thrust increased as the rotating angle velocity increased. The maximum propulsive efficiency was 27.9% at a calculated angle velocity. The flow field of this rotating type propulsion mechanism is unsteady and very complex because the wing rotates and moves unsteadily in the channel. However, using the advanced vortex method, it could be calculated accurately.
Drag reduction from fences on a square prism near plane wall
노기덕,Baoshan Zhu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.12
The suppression of fluid force acting on a square prism near a plane wall was studied by attaching fences to the corners of the prism. The height of the fences was 10% of the square width and the Reynolds number considered was Re=2.0×10⁴. The experimental parameters were the attachment location and number of fences, the gap ratio G/B (G/B=0.1~1.2) to the prism. The average drag coefficients were increased and the average lift coefficients decreased and increased with the gap ratios toward the plane wall. The drag of the prism was reduced by 7.6% on average with the gap ratios by attaching a normal fence at the upper rear corner and a horizontal fence at the lower rear corner of the prism. By conducting a visualization experiment, it was noticed that the vertical fence installed at the upper rear edge generated a clock-wise vortex past the fence and reduced the separation region.
Effect of Low-Temperature Heat Treatment on PM2.5 Adsorption Properties of GO Films
Weiwu Zou,Baoshan Gu,Shiqing Sun,Shidong Wang,Xin Li,Haoqi Zhao,Peiyan Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01
To explore the mechanism of GO acting on PM 2.5, a graphene oxide (GO) film was prepared via a spraying method for air purification. The effects of different media, temperature and heat treatment times on the adsorption of PM 2.5 on GO film were investigated. The morphology, composition and structure of GO materials were characterized by scanning electron microscopy (SEM), electron spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FT-IR) and Raman spectroscopy. When the vacuum heat-treatment temperature is below 80 ℃ and the atmospheric heat-treatment temperature is below 100 ℃, the air purification performance of the film does not change significantly. With the increase in the vacuum heat-treatment temperature, the removal efficiency of PM 2.5 by GO film decreases gradually from 95% to 83%. At different times, the vacuum heat treatment increases with time, and the film removal rate shows a downward trend. As the heat-treatment temperature and time increase, a certain redox reaction occurs in the GO, and the air purification performance decreases. At a temperature of 120 ℃ and a time of 8 h, the removal rate drops to 81.68%. The adsorption of PM 2.5 by GO film mainly relies on the action of oxygen-containing functional groups.
Comparative Investigation Into Field Performance of Steel Bridge Deck Asphalt Overlay Systems
Xiaoyang Jia,Baoshan Huang,Shangjiang Chen,Dawei Shi 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.7
The steel bridge deck overlay provides a smooth surface for riding and protects the deck from influence of traffic and environment factors. The presence of distress on overlay may compromise the serviceability of a bridge. A better understanding of distress is indispensable for designers to make improvements on asphalt overlay to extend the service life. A field investigation into performance of two bridge deck asphalt overlay systems was conducted. The overlay system included an epoxy asphalt overlay and a composite asphalt overlay consisting of Stone-Matrix-Asphalt (SMA) and Gussasphalt (GA). The field investigation was conducted to evaluate the difference in performance between two systems. Chemical analyses were performed on core samples from each bridge to further investigate the distress mechanism of each system. Results indicated that the two overlay systems generally exhibited similar field performance. Each bridge developed different distress, mainly due to the poor bonding between layers or between overlay and steel deck.