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좌측 슬부 통증을 호소하는 베이커 낭종 환자에 대한 고주파 치료 증례보고 1례
한아람,전효승,남동우,Aram Han,HyoSeung Jeon,Dongwoo Nam 대한융합한의학회 2021 대한융합한의학회지 Vol.1 No.1
Objectives: The purpose of this study is to investigate the effect of ultrasound therapy on left knee pain and instability diagnosed with Baker's cyst in a 25-year-old male patient. Methods: Patient was treated with Radio frequency ablation treatment on left knee from Naeseulan (EX-LE4) to Wijoong (BL40). The effect of radio frequency ablation was assessed by Visual Analog Scale (VAS), Western Ontario and McMaster Universities (WOMAC) and Euro Qol-5 Dimension Index (EQ-5D Index). The treatment was executed one time a day everyday form May 28th to June 1st of 2020. Patient was observed from May 26th to June 1st. Results: After five sessions of radio frequency ablation, VAS of left posterior knee pain was improved while no improvement was discovered at left medial knee. In Korean WOMAC scale, only subscale of weight bearing and walking around plain were improved. EQ-5D did not show any improvement. Conclusion: The results suggest that radio frequency ablation treatment can be a valuable option in treating knee pain and daily living function. Further study seems to be needed based on long-term intervention.
우주발사체 엔진용 산화제 개폐밸브의 위상 최적화 및 적층제조 연구
김진원(Jinwon Kim),홍문근(Moongeun Hong),전효승(Hyoseung Jeon) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.6
Since 2019, Korea Aerospace Research Institute (KARI) has been developing a main oxidizer shutoff valve (MOV) for space launcher’s 7 ton thrust liquid engine. In this study, various attempts were made to reduce the weight of the MOV by applying additive manufacturing (AM) technology rather than conventional manufacturing methods that used machining and welding, and finally achieved a weight reduction of 15%. For AM application, research on improvement in the flow efficiency inside the MOV, removal of unnecessary structures for integrated manufacturing, application of improved materials, heat treatment, and post-process technology were conducted. This study confirmed that best weight reduction effect could be expected when AM was applied to space launch vehicle parts operating in extreme vibration and cryogenic environments.