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한정화(Han JungHwa),김상수(Kim Sang-Soo),노희민(Noh HeeMin),김준곤(Kim Junkon),조홍식(Joh hongsik) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This study was conducted to analyze the vibration characteristics of EMU type High-speed train. To understand which route the vibration characteristics of the train are contributed and how it influences on EMU type High-speed train, OPTA analysis, which is a type of TPA, was applied to investigate the contribution level of each part. The results show high contributions from the center pivot, and low frequency vibrations had much effects on the train during the high-speed run. Henceforward, drawing the complete overall vibration flow chart by specifying researches and detailed vibration routes will lead to reduction of vibration which will expand further studies on speed improvement, ride quality and electronic parts.
Jiyoun Bang,김종욱,이유미,Junghwa Joh,Eun-Hye An,Jae-young Lee,Ji Yeon Kim,최인철 대한마취통증의학회 2011 Korean Journal of Anesthesiology Vol.61 No.6
The addition of thoracic epidural anesthesia to general anesthesia during cardiac surgery may have a beneficial effect on clinical outcome. However, epidural catheter insertion in a patient anticoagulated with heparin may increase the risk of epidural hematoma. We report a case of epidural hematoma in a 55-year-old male patient who had a thoracic epidural placed under general anesthesia preceding uneventful mitral valve replacement and tricuspid valve annular plasty. During the immediate postoperative period and first postoperative day, prothrombin time (PT) and activate partial thromboplastin time (aPTT) were mildly prolonged. On the first postoperative day, he complained of motor weakness of the lower limbs and back pain. An immediate MRI of the spine was performed and it revealed an epidural hematoma at the T5-6 level. Rapid surgical decompression resulted in a recovery of his neurological abnormalities to near normal levels. Management and preventing strategies of epidural hematoma are discussed.