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최성기(S.K. Choi),조이석(I.S. Jo),김봉준(B.J. Kim),문영훈(Y.H. Moon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
Manufacturing technologies for various automotive components such as radiator support, body and frame structure have been developed by using hydro forming technology. The cross-section of the axial feeding punch was manufactured in a rectangular shape to prevent crackings and increase the hydroformability of tubes, But the leakage of fluid at the comer parts of the rectangular tube has caused trouble in increasing internal pressure for the hydroforming. To solve this problem, the lead strip and the O-ring were applied as sealing material to prevent leakage, and the operational results are compared with each other.
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3D 비전 검사 시스템을 위한 간소화된 3D 카메라 캘리브레이션 알고리듬 개발
정의태(Ui-Tae Jeong),조이석(I-Seok Jo),이형준(Hyeong-Jun Lee),이인수(In-Soo Lee) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
A simplified 3D camera calibration algorithm for 3D vision inspection system is proposed in this paper. Camera intrinsic parameters and distortion coefficients are obtained using planar calibration target. Calibration target for 3D optical triangulation calibration is same as camera calibration process. Gage block is used to verify 3D camera calibration accuracy.
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김정운(J . W . Kim),김봉준(B . J . Kim),조이석(I . S . Jo),문영훈(Y . H . Moon) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.3
N/A The thermal shock resistance has been investigated and compared in three hot-work tool steels. The resistance to thermal shock is first of all a matter of good toughness and ductiliy. Therefore, a proper hot-work tool steel should be characterized by high fracture strength and high temperature toughness. In this study, new test method is proposed to measure the thermal shock resistance. New method is basically based on Uddeholm` thermal shock test but some modification has been properly applied. Based on these results, some critical temperature(T_(fractures)) at which fracture occur can be measured to characterize the thermal resistance of the materials. The specific values of ΔT, the temperature difference between holding temperature and T_(fractures), has been successfully used as a measure of the thermal shock resistance in this study, the results showed that the thermal shock method used in this study was properly modified.
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