http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조희근(Hee-Keun Cho),서정기(Jung-Ki Suh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An entire composite structure satellite is developing for the first time in Korea. All of the structure is made of CFRP-composite faced aluminum honeycomb sandwich structure. Here the random and sinusoidal spectrum analysis of the satellite was carried out by using the finite element method. The general spectrum analysis was herein performed but also the PSD (power spectrum density) function for random vibration analysis had been transformed into equivalent time domain function and then transient analysis is conducted. The time history of displacement, acceleration, stress and velocity responses with respect to the PSD input has been achieved by the time dependent transient function transformed from frequency PDS function. It enables one to perform dynamic durability analysis and then expect the life time of the composite structure. The composite faced sandwich structure’s spectrum analysis of a domestically-developed satellite, STSAT-3, has been discussed in the present study.
서정기,김광명,김남규,정환영,오석전 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.3
The authors are reporting two cases of huge primitive neuroectodermal tumors involving cerebral hemisphere. These are highly malignant neoplasm, both clinically and histologically. They are rapidly growing tumors, with a brief duration of symptoms and a rapidly progressive course. The patients were discharged after subtotal resection of tumor mass with an uneventful course, but one was dead within 2 months after the operation. These tumors usually occur in children and young adult. We have experienced two cases surgically treated in infancy.