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CNT를 첨가한 전력케이블용 반도전 재료의 열적특성에 관한 연구
양훈,국정호,방정환,박대희,Yang, Hoon,Kook, Jeong-Ho,Bang, Jeong-Hwan,Park, Dae-Hee 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.12
In this paper, we have investigated thermal properties of semiconductive shield materials for power cables. EEA (Ethylene Ethyl Acrylate) was used for base polymer and TGA (Thermal Gravimetric Analysis) and AFM (Atomic Force Microscope) were investigated with various carbon black and CNT (carbon nanotube) contents. When CNT reinforced composites and conventional composite were investigated with TGA, we knew that thermal properties of CNT reinforced composite were better than them of conventional composite. To investigate roughness, we used AFM. Before and after aging, AFM was applied and after aging, roughness was increased. As a result, suitable CNT and CB(carbon black) content is CNT:CB=50:50.
폐타이어 분말의 치환율과 입자크기에 따른 경량 모르타르의 역학적 특성
양훈,이용,이상수,Yang, Hun,Lee, Yong,Lee, Sang-Soo 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.4
본 연구는 최근 산업 발전으로 나날이 증가하는 폐타이어가 야기시키는 환경오염을 해결하고 폐타이어를 재활용함으로써 무분별한 매립을 예방하기 위한 기초 실험이다. 건축 재료의 경량골재를 폐타이어분말로 대체함으로써 폐타이어분말의 경량성을 검토하고 폐타이어분말의 재활용 계획을 제시하고 적용하고자 한다. 선행실험으로 폐타이어분말을 20, 40, 60, 80, 100(%) 등으로 치환하여 실행하였고, 측정 항목은 강도와 밀도이다. 본 실험은 선행실험을 기초로 하여 폐타이어 치환율을 15, 20, 25(%) 등으로 하였다. 폐타이어 골재의 입도는 0.2, 0.8, 1~2, 3~5, 5~7(mm) 등으로 고정하였다. 실험 결과 폐타이어 입도 1~2mm, 치환율 15%가 가장 적정한 입자크기 및 치환율 값을 나타내었다. This study is basic experiment which prevents indiscriminate reclamation and recycles the wasted tire in order to solve environmental pollution according to generation rate of the wasted tire from recently industrial development. By applying as the substitute material of the lightweight aggregate among the constructional materials in order to evaluate the lightness of the wasted tire chip and suggest the recycling plan of the wasted tire chip. The prior experiment did the replacement ratio of the wasted tire with 20%, 40%, 60%, 80%, 100%, etc. and made a study on the strength and density properties. Based on the prior experiment of wasted tire, the replacement ratio was fixed at 15, 20, 25%, particle size of wasted tire was fixed at 0.2, 0.8, 1~2, 3~5, 5~7(mm). As a result, it is supposed that the best replacement ratio and particle size are 15% and 1~2mm, respectively.
양훈,방정환,장홍순,나창운,박대희 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1
Use of the carbon nanotube is superior to general powder state materials of mechanicaland electrical properties. Because its ratio of diameter and length (aspect ratio) is very large, it has material. Based on this advantage, the existing carbon black of semiconductive shield materials used in power cables can acquire excellent properties by using a small amount of carbon nanotubes. Thus, we investigated the thermal properties of the carbon nanotube, such as thermal conductivity, specific heat, and DSC (Differential Scanning Calorimetry). We found that a high thermal resistance level is demonstrated by using a small amount of carbon nanotubes. As a result, this tendency confirms high cross-linking density in a new network in constructive properties.
양훈철(Hooncheul Yang),송철화(Chul Hwa Song),김무환(Moo Hwan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The objective of this work is to propose calibration facility in which a thin film type heat flux sensor can be calibrated under convective flow condition by using a small wind tunnel with the constant temperature plate condition. A small wind tunnel has been built to produce a boundary layer shear flow above a constant temperature copper plate. 12-independent copper blocks, thin film heaters, insulators and temperature controllers were used to keep the temperature of flat plate constant at a specified temperature. Three commercial thin film-type heat flux sensors were tested. Convective calibrations of these gages were performed over the available heat flux range of 1.4~2.5 ㎾/㎡. The uncertainty in the heat flux measurements in the convective-type heat flux calibration facility was ±2.07%. Non-dimensional sensitivity is proposed to compare the sensitivity calibrated by manufacturer and that of experiment conducted in this study.
치주인대의 비선형 거동을 고려한 하악 견치의 유한요소해석
양훈철(HoonChul Yang),김기태(KiTae Kim),하만희(ManHee Ha),손우성(WooSung Son) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Hyperelastic constitutive equations for nonlinear deformation of the periodontal ligament were<br/> investigated. The parameters in the strain energy potentials were obtained from experimental data for uniaxial<br/> and shear responses of the human periodontal ligament. The hyperelastic constitutive equations based on two<br/> strain energy potentials was also compared with the linear elastic equation, which is recently reported. The<br/> best fitted parameters in the strain energy potentials was applied to finite element program (ABAQUS) to<br/> simulate special orthodontic treatment of a mandibular canine.
양훈철(Hooncheul Yang),송철화(Chul Hwa Song),김무환(Moo Hwan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The objective of this study is to propose an experimental calibration facility in which a heat flux sensor can be calibrated under conductive condition by using helium gas. The heat flux calibration facility was designed, simulated and manufactured for use in a high heat transfer condition. It delivers heat fluxes up to a maximum of 35 ㎾ m-2. A copper block heated electrically with 3.5㎾ power is designed to produce uniform temperature up to 600 K across its face. High heat fluxes are provided between hot plate and cold plate by 1 mm height helium filled gap. A cold plate is maintained around 300 K through pool boiling using a refrigerant and water-cooled heat exchanger. A simulation was conducted to verify the design of the main test section. To verify the performance of calibration facility, a heat flux sensor was examined. The measured heat fluxes were compared to the calculated one.
추출조건이 해동피 열수 추출물의 항산화 효과에 미치는 영향
양훈석(Hoon-Suk Yang),이양봉(Yang-Bong Lee),유병진(Byung-Jin Yoo) 한국식품영양과학회 2013 한국식품영양과학회지 Vol.42 No.4
해동피 항산화 물질을 추출하기 위한 열수 추출조건을 냉장처리 여부, 추출온도 및 추출시간을 달리하여 검토하였다. 이러한 조건을 달리하여 추출된 추출물의 총 폴리페놀 화합물의 함량, DPPH radical 소거능 및 HRSA를 측정하였다. 그 결과 총 폴리페놀 함량은 냉장처리 후 추출온도 95℃, 추출 15시간에서 612 μg/mL로써 가장 높았다. DPPH radical 소거능은 냉장처리 후 추출온도 95℃, 추출 15시간에서 가장 높은 78.8%이었고 대조구인 ascorbic acid의 70.2%보다 높게 나타났다. HRSA는 냉장처리 후 추출온도 95℃, 추출 15시간에서 ascorbic acid 56.6%보다 높은 69.0%로 가장 높게 나타났다. 따라서 이상의 열수추출에 의한 해동피의 항산화성 활성 및 그 최적 조건을 확립한 것으로 향후 해동피의 기능성식품으로서의 이용개발을 위한 중요한 자료로 이용될 수 있음을 보여 주고 있다. In this study, we established the optimal conditions for obtaining water-soluble extracts with antioxidant activity from Kalopanacis cortex. The extraction conditions tested included cold treatment, extraction time (1, 5, 10, 15, and 24 h), and extraction temperature (55, 75, and 95℃). The highest total polyphenol compound content from water soluble extracts (612 μg/mL) was obtained at 95℃ for 15 h after cold treatment. The 1,1-diphenyl- 2-picrylhydrazyl (DPPH) free radical scavenger activity was also highest (78.8%) under these conditions, which was comparable to 70.2% of ascorbic acid. The hydroxyl radical scavenging activity (HRSA) was also highest (69.0%) under these conditions, stronger than 56.6% of ascorbic acid. These results may provide critical evidence supporting the use of Kalopanacis cortex as a source of antioxidants in functional foods.