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Stand-Alone Cages for Anterior Cervical Fusion: Are There No Problems?
Sang Youp Han,Hyun Woo Kim,Cheol Young Lee,Hong Rye Kim,Dong Ho Park 대한척추신경외과학회 2016 Neurospine Vol.13 No.1
Objective: There are complications in stand-alone cage assisted anterior cervical discectomy and fusion (ACDF), such as cage subsidence and kyphosis. Here we report our clinical result on ACDF, comparing with stand-alone cages and with cervical plate system for degenerative cervical spine diseases. Methods: Patients with degenerative cervical disease who were diagnosed and treated in Konyang University Hospital between January 2004 and December 2014 were included in this study. Patients who had operation in single level ACDF were selected. Patients scored the degree of pain using visual analog scale before and after the surgery. Subsidence was defined as ≥3-mm decrease of the segmental height, and cervical kyphosis was defined as progression of ≥5° at 12 months after postoperative follow-up compared to that measured at the immediate postoperative period. Results: A total of 81 patients were enrolled for this study. Forty-five patients were included in a cervical plate group and the others were in stand-alone cage group. There was no statistical difference in pain score between the 2 groups. Segmental subsidence was observed in 7 patients (15.6%) in plate-assisted cervical fusion group, and 13 patients (36.1%) in stand-alone cage group. Segmental kyphosis was observed in 4 patients (8.9%) in plate-assisted cervical fusion group, and 10 patients (27.8%) in stand-alone cage group. There was statistical difference between the 2 groups. Conclusion: There was no difference in pain between 2 groups. But stand-alone case group showed higher incidence rate than plate-assisted cervical fusion group in segmental subsidence and cervical kyphosis. When designing cervical fusion, more attention should be given selecting the surgical technique.
핫엠보싱 및 폴리에틸렌 글라이콜 매개 본딩을 이용한 나노채널의 저비용 신속 제작 공정
한상희(Sang-Hee Han),맹준호(Joon-Ho Maeng),박준홍(Jun-Hong Park),신현준(Hyun-Joon Shin),이상엽(Sang-Youp Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
We demonstrated an extremely easy and cost-effective nanochnnel fabrication method based on hot embossing process and polyethylene glycol (PEG) mediated bonding method. Master mold for hot embossing process was fabricated on silicon wafer using negative electron beam lithography and reactive ion etching process. Nanogroove array were patterned in a small piece of poly(methyl methacrylate) (PMMA) plate using hot embossing process and were covered by bonding with 170um thick microscope coverslip. Before nanogrooves were sealed with coverslip, nanopatterned PMMA plate was coated with monolayer of polyethylene glycol and exposed to oxygen plasma. Hot embossing conditions such as force, temperature, and pressing time were optimized at 0.92N, 125±2°C and 30 min. Using our method, nanochannels of four different dimensions (200(h) × 400(w), 200(h) × 200(w), 100(h) × 100(w), 100(h) × 70(w)) were fabricated and the dimension of each nanochannel was examined using atomic force microscopy. Also PEG mediated bonding showed excellent water tight performance.
Electrochemical properties of LiNi1-(x+y)AlxZnyO2 cathode materials synthesized by emulsion method
김복희,Sang-Jae Han,Min-Jeong Jang,안병국,Myoung-Youp Song 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
LiNi1-(x+y)AlxZnyO2 composition (x=0.0-0.10, y=0.0-0.005) powders, in which the Ni3+ has been partially substituted with Al3+ and Zn2+, were synthesized by an emulsion method and their electrochemical properties were investigated. The emulsionderived powder had a porous spherical shape agglomerated from fine particles, whereas the calcined powder had an agglomerated shape with nanosized particles, under 50 nm. The intercalation of Li+ was higher in the LiNi1-(x+y)AlxZnyO2 than in the pure LiNiO2. The first discharge capacity and fading rate for 20 cycles were 161 mAh/g and 8.5% in LiNiO2, 168 mAh/ g and 7.1% in LiNi0.99Al0.01O2, 163 mAh/g and 5.5% in LiNi0.995Zn0.005O2 and 164 mAh/g and 7.4% in LiNi0.992Al0.006Zn0.002O2.
이중엽(Joong-Youp Lee),정태규(Tae-Kyu Jung),한상엽(Sang-Yeop Han),김영목(Young-Mog Kim) 한국항공우주연구원 2006 항공우주기술 Vol.5 No.2
본 논문에서는 제어밸브에 대한 유공압적, 기계적, 전기적 부분에 대하여 전반적인 기술 적인 사항 및 설계 기술들을 다루었다. 특히 제어밸브를 이용한 시험으로부터 도출하기 어려운 많은 요소의 동특성을 시스템 모사코드인 AMESim 을 이용하여 예측해보았고, 일반 적인 물리적 동특성도 또한 실제 시험결과와 비교 검토하였다. 또한 제어밸브의 단품 상태에서의 동특성 외에 시스템 연계 상황에서의 특성도 예측하고자 하였고, 이를 근간으로 하 여 발사체 엔진 추진제공급시스템의 제어 관련 분야에 응용하였다. This paper deals with technological and design skills for all pneumatical, hydraulical, mechanical, and electrical parts related to control valve. Especially, a variety of dynamic characteristics, which are not easily extracted from field tests using control valves, are studied by system-simulation code, AMESim. The simulated results are also compared and examined with actual testing results in terms of physical dynamic characteristics. In addition, this paper contains the simulated system characteristics including dynamic characteristics in component level of valve itself. Based on the results, it is applied to control system of propellant feeding system in liquid-propellant engine of satellite launcher.