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정철재(CJ Jeong),차순도(SD Cha),조치흠(CH Cho),이태성(TS Lee),서영욱(YU Suh),권건영(KY Kwon) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.5
Primary malignant melanoma of the vagina are believed to arise from melanocytes which may be present in the epithelium of the vagina. These tumors are very rare and comprise less than 0.5% of all vaginal malignancies, which are the worst prognosis compared to other malignant vaginal neoplasms. We present a case of primary malignant melanoma of the vagina with brief review of literature.
대형 고속프레스의 유한요소해석을 통한 진동 및 소음에 대한 연구
김승수,정철재,이춘규 한국금형공학회 2023 한국금형공학회지 Vol.17 No.4
The electric vehicle market is developing rapidly around the world. Also, parts of electric vehicles require precision.In order to produce high-precision motor cores,Press equipment must also have good precision. Drive motor cores are an important technology for electric vehicles. It uses a large high-speed press to mass-produce drive motor cores. Because it's a large high-speed press, there are many reasons why the precision is not good. One of the causes is vibration and noise. Recently, as environmental demands have become stricter, regulations on noise and vibration have been strengthened. It is important for press machines to reduce vibration first for sound insulation and dust proofing. This is because the "breakthrough" phenomenon occurs in the press. Dynamic precision is the precision under the load of the press, Design considering strain and stiffness shall be made. Vibration and noise may occur due to SPM of high-speed press,And vibration and noise can cause structural deformation of the press. Structural deformation of the press can affect the precision of the product.Noise and vibration also cause problems for workers and work environments. Problems with vibration and noise occur during press processing, and vibration and noise lead to damage to the mold or defects in the product. Reliability in high-quality technology must be secured with low noise and low vibration during press processing. Modular shape and deformation energy effects were analyzed through finite element analysis. In this study, a study on vibration and noise countermeasures was conducted through finite element analysis of a large high-speed press.