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양훈철(Hooncheul Yang),송철화(Chul Hwa Song),김무환(Moo Hwan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
New method for the design, fabrication, and calibration of micro-machined heat flux sensor has been developed. Two types of micro-machined heat flux sensor having different thicknesses of the thermal-resistance layer are fabricated using the MEMS technique. Photo-resist patterning using a chrome mask, bulk-etching and copper?nickel sputtering using a shadow mask are applied to make heat flux sensors, which are calibrated in the convection-type heat flux calibration facility. The sensitivity of the device varies with thermalresistance layer, and hence can be used to measure the heat flux in heat-transfer phenomena.
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.
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(Yang, Hun-Cheol),이수범(Soo Beom Lee) 대한교통학회 2008 대한교통학회 학술대회지 Vol.58 No.-
2006년 도로교통안전관리 공단(RTSA)의 자료에 의하면 고령운전자의 교통사고건수는 고령층의 사회적 활동이 적음에도 불구하고 전체 교통사고건수의 약 30%로 빠른 증가를 나타냈다. 그리고 우리나라의 고령자 교통사고 사망자수는 OECD 국가 중에서 가장 높은 수치를 나타내고 있다. 특히 고령화가 진행될수록 고령운전자의 수 역시 증가될 것으로 예상되어 향후 고령운전자에 의한 교통사고는 급증할 것으로 판단된다. 따라서 본 연구에서는 고령운전자의 운전행동특성을 측정할 수 있는 운전자 적성검사(Driving Aptitude) 항목별 자료와, 개인별 교통사고 자료를 토대로 고령운전자의 사고위험군판별모형(Accident Prone Group Discriminant Model)을 개발하였다. 본 연구는 효과적인 고령운전자 교통안전대책 및 관리방안을 수립하기 위한 기초자료 구축 모형으로 활용될 수 있을 것이다.
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.
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.