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황준필 한국헤겔학회 2018 헤겔연구 Vol.0 No.43
Der Beitrag fokussiert anhand des Begriffs des Absoluten den Wandel der Schellingschen Philosophie in der Zeit zwischen 1804 und 1809, wie er sich exemplarisch im Vergleich der beiden Texte „Philosophie und Religion“ einerseits und „Philosophische Untersuchungen über das Wesen der menschlichen Freiheit“ andererseits darstellt. Es wird für die These argumentiert, dass der Wandel durch ein theorieimmanentes Problem seiner Identitätsphilosophie bedingt ist, welches Schelling durch eine Neukonzeption des Absoluten in der Freiheitsschrift zu lösen versucht. Dabei wird der systematische Zusammenhang der Freiheit des Endlichen und des Problems des Bösen mit dem Begriff des Absoluten herausgearbeitet. Ferner wird Schellings Verständnis des Philosophierens im Rahmen seiner Konzeption der Philosophie als der „Lehre vom Absoluten“ erläutert. 이 글은 일차적으로 셸링의 철학적 전환점이 포함되는 1804년과 1809년 사이의 두 저작에 나타나는 절대자 개념을 다룬다. 즉 앞선 『철학과 종교』와 이후의 『인간 자유의 본질에 대한 철학적 탐구』에 나타나는 절대자 개념을 비교하여, 그 변화의 양상과 원인을 셸링 철학의 내재적인 관점에서 탐구하고자 한다. 구체적으로 전작에서 표방하는 절대적 동일성으로서의 절대자 개념이 어떤 내재적인 모순에 부딪혔으며, 셸링은 이를 탈동일성 철학적 관점에서 쓰인 이후 저작에서 어떻게 해결하려 했는지 살펴볼 것이다. 이를 통해 셸링철학에서 절대자 개념과 연관되는 유한자의 자유와 악의 문제, 더 나아가 "절대자에 관한 학설"로서 그의 철학이 지향하는 '철학함'의 의미가 드러날 것이다.
황준필,하지훈,노근영,정윤주,박수남 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
N,N0-Diferuloyl-putrescine (DFP) containing ferulamide moiety has skin whitening and antioxidative activities. In this study, we synthesized DFP (n = 4), DFP-1 (n = 3) and DFP-2 (n = 2) with different diamide linkage chain lengths connecting dimeric ferulamide moieties. DFP-1 had higher antioxidative activities and cell penetration ratio than other derivatives for the cellular protective effects against UVA and 1O2. We identified that these oxidative protective effects of DFP-1 were contributed by low steric hindrance on electron donor groups and dipole moment through homogeneous electron density. These results suggest that DFP-1 could be used as potential antioxidative ingredient.
황준필,심현보,임수영,안기용 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1
This study concerns properties of concrete containing Recycled Aggregate (RCA). To compensate for a reduction of properties for the RCA concrete, 30% Pulverised Fuel Ash (PFA) and 60% Ground Granulated Blast furnace Slag (GGBS) were used for replacement for Ordinary Portland Cement (OPC). The compressive strength for RCA concretes was measured for 180 days, and simultaneously the durability against chloride, frost and sulfate environment was evaluated. As a result, the RCA concrete always revealed the lower strength and resistance to chloride, frost and sulfate attack. However, the RCA concrete containing 30% PFA and 60% GGBS enhanced the strength to the level for control concrete containing natural aggregate. The rate of chloride transport was lowered by addition of 30% PFA and 60% GGBS in the RCA concretes after 91 days of curing, presumably due to the refinement of pore structure and further formation of hydration products. As for the frost damage, 30% PFA concrete containing the RCA showed the greatest resistance to frost, while 60% GGBS concrete containing RCA to the similar level of the control. It was found that the RCA concrete containing 30% PFA and 60% GGBS were slightly more resistant to sulfate attack than control.
Risk of Environmental Contamination Arising from Concrete Structures, Part I: CO2 Emission
황준필,정민선,이창근,진성호,안기용 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.5
The present study concerns the CO2 emission in the process of cement manufacture. Information on raw materials, energy source and oxide composition was achieved from Korean major six manufacturers. As a result, it was found that the energy efficiency for kilning and control for a loss of CaO in cement manufacture are key factors to emission of CO2. The variation in the amount of coal in the process of kilning accounted for about 30 kg for one tonne of cement, as being equivalent to 70 kg CO2/tonne-cem. Simultaneously, the loss of CaO in refinement of raw materials is crucial in reducing the CO2 emission. The loss of CaO in the cement production was in the range of 9-24 kg for one tonne of cement, which may impose unnecessary energy of coal in kilning and a further decomposition of CaCO3 to CaO and CO2. Substantially, it can be said that energy control for high efficiency of coal in the kilning process and control for a loss of CaO may reduce several hundreds kg CO2/tonne-cem, compared to 729-911 kg CO2/tonne-cem in the cement production. Alternatively, the use of pozzolanic material for Portland cement can reduce the CO2 emission. 30% PFA and 60% GGBS in a concrete mix reduced CO2 emitted for a given mix about 28.9 and 49.6% respectively, compared to Portland cement.
굵은 골재를 이용한 3D 콘크리트 프린팅 기술개발에 대한 연구
황준필,권홍규,Hwang, Jun Pil,Kwon, Hong-Kyu 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3
Digitization and automation technologies have rapidly maximized productivity and efficiency in all industries over the past few decades. Construction automation technology has either stagnated over the same period or has not kept pace with overall economic productivity. According to the research studies up to now, the output of concrete structures using coarse aggregates (8mm or more) is very limited due to the limitations of equipment and materials. In this study, information on the development process of 3DCP equipment that can print concrete structures with the printing width (100 mm or more) and printing thickness (30 mm or more) using a 3DCP material mixed with coarse aggregate (8 mm or more) is provided. To verify the performance of the developed 3DCP equipment, experimental data are provided on output variables, the number of layers, and the inter-layer printing time interval. The evaluation and verification data of various mechanical properties (compressive and splitting tensile strength) of printed materials using coarse aggregates are provided.