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DC마그네트론 스퍼터링으로 Pd박막 입힌 Nafion막의 특성
황기호,조원일,조병원,윤성렬,하흥용,오인환,김광범,Hwang, Gi-Ho,Cho, Won-Il,Cho, Byung-Won,Yoon, Sung-Ryul,Ha, Heung-Yong,Oh, In-Hwan,Kim, Kwang-Bum 한국전기화학회 2002 한국전기화학회지 Vol.5 No.2
상용 고분자 전해질인 Nafion 115 및 Nafion 117막 위에 do magnetron sputtering방법으로 Pd박막을 다양한 두께로 증착한 다음, 개질된 고분자 전해질 막의 morphology, proton 전도도(conductivity), 메탄을 투과도(permeability)를 측정하였으며, membrane and electrode assemblies(MEA)를 구성하여 DMFC 단위전지 성능을 측정하였다. Pd 박막은 Nafion막이 지니고 있는 단점인 메탄을 crossover에 대한 barrier로서 작용하였지만, 동시에 Nafion막의 고유 특성인 proton전도도의 감소를 가져왔다. Pd박막에 의하여 개질된 Nafion막의 메탄올에 대한 투과도와 proton전도도는 Nafion 막 상에 증착된 Pd 박막의 두께가 증가할수록 직선적으로 감소하는 경향을 나타냈다 개질된 Nafon 막을 사용하여 제작한 direct methanol fuel cell(DMFC)단위전지의 성능은 전체적으로 약간 저하되었다. Modified polymer electrolyte membranes were fabricated by the applying dc magnetron sputter-deposited Pd thin layers on the surface of the $Nafion^{TM}$ membranes in argon atmosphere. The Pd thin films were characterized by investigating its morphology, methanol permeability, and protonic conductivity. The performance of a direct methanol fuel cell(DMFC) with the modifed polymer electrolyte membrane was also tested by the measurement of its currents and voltages under flowing methanol. The Pd thin film could be a barrier layer to methanol crossover, but the protonic conductivity of the modified polymer membrane was reduced. By using the modified polymer eletrolyte membranes, both the methanol permeability and the protonic conductivity were decreased with increasing the thickness of Pd thin film. However, the performances of DMFC were almost independent on the thickness of Pd thim films. The efffcts of methanol concentration in a feeding fuels on the protonic conductivity and the cell performance were also investigated.
제왕절개술을 위한 전신마취 시 병적비만 산모에서 Sugammadex의 사용
오유나 ( You Na Oh ),김교상 ( Kyo Sang Kim ),윤성렬 ( Sung Ryul Yoon ),김건식 ( Keon Sik Kim ) 경희대학교 경희의료원 2016 慶熙醫學 Vol.31 No.1
Morbid obesity in a pregnancy is a great challenge to medical practice especially when the patient requires Caesarean section. A 38-year-old primigravida (127.5 kg, 164 cm, BMI 47.4 kg/m2) with fetal breech presentation was scheduled Caesarean section at 39-week gestation. After informed consent, anesthesia was induced in rapid sequence with propofol and rocuronium (1 mg/kg), which was monitored with train- offour stimulation and bispectral index scale. Intubation was performed using Pentax-AWS<sup>®</sup> video laryngoscope, and anesthesia was maintained with sevoflurane and remifentanil. When the operation was over, the patient was extubated at TOF ratio 0.98 after reversal with sugammadex (2 mg/kg). We report sugammadex is a quick, safe, and effective reversal of rocuroniuminduced neuromuscular block in morbidly obese paturient during Caesarean section under general anesthesia.