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황토골재를 사용한 콘크리트의 제특성에 관한 실험적 연구
황준필(Hwang, Jun Pil),김기범(Kim, Ki Beom),안기용(Ann, Ki Yong) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
For the characteristics of the concrete using Hwang-Toh aggregate, thermal Insulation capacity test, absorption capacity of heavy metals several test were performed. The study found that the Hwang-Toh concrete could improved the characteristics of conventional normal concrete. The Hwang-Toh concrete shows 67.7% lower thermal conductivity than normal concrete, so it shows good thermal insulation capacity. And the leaching test results showed that 96% of heavy metals such as Pb, Zn, Mn were absorbed by the Hwang-Toh concrete.
황토골재를 사용한 콘크리트의 제특성에 관한 실험적 연구
황준필 ( Hwang Jun Pil ),김기범 ( Kim Ki Beom ),안기용 ( Ann Ki Yong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
For the characteristics of the concrete using Hwang-Toh aggregate, thermal Insulation capacity test, absorption capacity of heavy metals several test were performed. The study found that the Hwang-Toh concrete could improved the characteristics of conventional normal concrete. The Hwang-Toh concrete shows 67.7% lower thermal conductivity than normal concrete, so it shows good thermal insulation capacity. And the leaching test results showed that 96% of heavy metals such as Pb, Zn, Mn were absorbed by the Hwang-Toh concrete.
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.
N,N-Diferuloyl-putrescine (DFP)과 그 유도체의 합성 및 항산화 활성
황준필 ( Jun Pil Hwang ),하지훈 ( Ji Hoon Ha ),김명규 ( Myung Kyoo Kim ),박수남 ( Soo Nam Park ) 한국공업화학회 2015 공업화학 Vol.26 No.1
N,N’-Diferuloyl-putrescine (DFP) present in plants such as Sophora japonica has been reported to have skin depigmentative and antioxidative activities. In this study, DFP, usually presents in nature a very little amount and its derivative (DFP-D) were synthesized in a large quantity for the use as functional cosmetical materials. The antioxidative activities of synthesized DFP and DFP-D were evaluated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay, chemiluminescence assay, and cell protective effect induced by 1O2, stress. DFP and DFP-D showed DPPH radical scavenging activities (FSC50) at 61.25 ± 2.25 μM and 12.92 ± 0.72 μM, respectively. ROS (reactive oxygen species) scavenging activities (OSC50) in the Fe3+-EDTA/H2O2 system of DFP and DFP-D were 2 times (1.84 ± 0.12 μM) and 13 times (0.174 ± 0.01 μM), respectively higher than that of L-ascorbic acid. 1O2, one of ROS playing a key role in the skin photo-aging, induces cellular membrane damages. DFP-D (50 μM) showed good cell protective effects (τ50 = 80.2 min) about 2 times more than that of (+)-α-tocopherol (τ50 = 43.6 min). These results suggest that the great antioxidative activities of DFP and DFP-D could be applied to cosmetic industries as functional cosmetic materials.
수중적층용 3D 콘크리트 프린팅 장비 개발에 대한 연구
황준필(Jun Pil Hwang),이호재(Hojae Lee),권홍규(Hong-Kyu Kwon) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.3
Recently, the demand for atypical structures with functions and sculptural beauty is increasing in the construction industry. Existing mold-based structure production methods have many advantages, but building complex atypical structures represents limitations due to the cost and technical characteristics. Production methods using molding are suitable for mass production systems, but production cost, construction period, construction cost, and environmental pollution can occur in small quantity batch production. The recent trend in the construction industry calls for new construction methods of customized small quantity batch production methods that can produce various types of sophisticated structures. In addition to the economic effects of developing related technologies of 3D Concrete Printers (3DCP), it can enhance national image through the image of future technology, the international status of the construction civil engineering industry, self-reliance, and technology export. Until now, 3DCP technology has been carried out in producing and utilizing residential houses, structures, etc., on land or manufacturing on land and installing them underwater. The final purpose of this research project is to produce marine structures by directly printing various marine structures underwater with 3DCP equipment. Compared to current underwater structure construction techniques, constructing structures directly underwater using 3DCP equipment has the following advantages: 1) cost reduction effects: 2) reduction of construct time, 3) ease of manufacturing amorphous underwater structures, 4) disaster prevention effects. The core element technology of the 3DCP equipment is to extrude the transferred composite materials at a constant quantitative speed and control the printing flow of the materials smoothly while printing the output. In this study, the extruding module of the 3DCP equipment operates underwater while developing an extruding module that can control the printing flow of the material while extruding it at a constant quantitative speed and minimizing the external force that can occur during underwater printing. The research on the development of 3DCP equipment for printing concrete structures underwater and the preliminary experiment of printing concrete structures using high viscosity low-flow concrete composite materials is explained.