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양훈철(Hoon-chul Yang),최홍석(Hong-seok Choi),정협재(Hyup-jae Chung) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
An articulated robot is being increasingly used in the industrial and service fields in order to improve human life as well as to increase operating efficiency. In this type of robot, operating mechanism is so complicated that the components suffered severe loading conditions. In particular, a variety of operating modes such as torsion, bending and tension, which results in the breakage of a conductor, is applied to the cable that supplies the robot with electric power. Therefore, proper design for this cable has been one of the important issues for improving the durability with respect to the various operating modes. In this study, the effect of the filler material and the cabling pitch on the durability under torsion loading condition will be discussed. For this, numerical simulation using a CableCAD software was conducted to evaluate the tension load which affects on durability under torsion loading condition. The durability of designed cables is also evaluated by a torsion tester. As a result of the simulation and experiment, durability based on the torsion can be improved by employing softened filler material and reduced cabling pitch.
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.
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.