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장데레사(The Re Sa Jang),김백선(Baek Sun Kim),김선명(Sun Myung Kim),추교영(Kyo Young Choo),오정환(Jung Hwan Oh),현영근(Young Geun Hyun),박수현(Soo Heon Park),최명규(Myung Gyu Choi),한준열(Jun Yeol Han),김재광(Jae Kwang Kim),정인식(In 대한소화기기능성질환·운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.2
N/A Background/Aims : Generally, it is recommended for patients with gastroesophageal reflux disease to sleep with the head of the bed elevated; however, many patients in Korea do not have heartburn symptoms during the night. Methods: We investigated the pattern of acid reflux in patients who were diagnosed as having definite pathological acid reflux on 24-hour pH monitoring. Results : One hundred patients were categorized into 3 groups; upright refluxer (68%), supine refluxer (2%), or combined refluxer (30%). Acid reflux was rare in supine positions but instead, usually occurred in upright positions. Acid reflux was found to occur most commonly after meals. The reflux symptoms occurred during pH monitoring with the average frequency of 5.5 times (total of 254 times) in 46 patients. The acid related symptoms were more common in the upright period and postprandially than the supine period. The presence of an esophagitis, an esophageal motility disorder, or the LES pressure did not make a significant difference between upright refluxer and supine refluxer. Conclusions : Gastroesophageal reflux was found to be rare in supine positions but usually occurred in upright positions. Gastroesophageal reflux occurred most commonly after meals, and was frequently associated with reflux symptoms.
조밀한 표면조직을 갖는 탄소재료의 Impedance Spectroscopy를 통한 전기화학적 거동의 해석
오한준,이종호,이영훈,고영신,Oh, Han Jun,Lee, Jong Ho,Lee, Young Hoon,Ko, Young Shin 대한화학회 1996 대한화학회지 Vol.40 No.5
Impedance Spectroscopy를 통하여 조밀한 표면조직을 갖는 glassy carbon과 PVDF 합성흑연의 표면에 대한 전기화학적 거동을 조사하였다. 이들 두 탄소재료는 모두 전압에 대한 높은 Faraday-임피던스의존성이 나타났으며, 이를 평가하기 위한 등가회로는 PVDF 흑연의 경우 lassy carbon의 등가회로에 소수성 결합제에 의한 저항과 축전용량이 추가된 형태로 나타났다. 또한 디들 재료는 표면의 차이로 인한 전기화학적 거동의 차이도 나타났다. The electrochemical behavior of glassy carbon and PVDF synthesis graphite materials with compact surface have been characterized by impedance spectroscopy. The Faraday-impedance both carbon materials were depended highly on polarization and the difference of electrochemical behavior accord to structure of surface between glassy carbon and synthesis graphite was represented, in these evaluated equivalent circuits, PVDF synthesis graphite was indicated with form that is added resistance and capacitance by the hydrophobic binder to glassy carbon equivalent circuit.
오한준,장경욱,지충수,Oh, Han Jun,Jang, Kyung Wook,Chi, Choong Soo 대한화학회 1999 대한화학회지 Vol.43 No.1
황산용액에서 제조된 Al양극 산화피막 내부로 여러 주파수의 교류전압을 통하여 1 g/L $KMnO_4$ 용액내에서 Mn금속을 전착시켰다. 이때 Al 산화피막 내부로 전착되는 Mn금속의 변화와 산화피막의 특성변화를 임피던스를 통하여 조사했다. 낮은 교류전압의 주파소로 Mn전착된 피막의 임피던스 스펙트럼은 황산에서 제조된 산화피막의 임피던스 스펙트럼과 차이를 나타냈으며, 특히 등가회로에서는 Mn전착의 영향을 나타내는 파라미터인 저항과 축전용량이 추가로 첨가되었다. 또한 Mn전착은 기공성의 산화피막 내부로 진행되는 것으로 나타났다. 또한 기공성의 산화피막의 경우는 저주파를 부하하여 Mn전착시킬 경우 비전도성의 피막성장에 의해 전하이동저항이 높게 나타났다. 이러한 Al산화피막의 특성은 전도도의 구배를 나타내는 파라미터인 Young 임피던스를 통하여 관찰되었다. The Al oxide layer formed in 1M $H_2SO_4$ solution and the influence of applied frequency for electrodeposition of Mn on Al oxide layer were characterized using by impedance spectroscopy. Mn compounds were electrodeposited at the base of pores during deposition with applied low frequency voltage. For the Mn deposited oxide layer at 6OHz and 5Hz in 1 g/L $KMnO_4$ solution, in equivalent circuit for interpretation, the resistance ($R_2$) and capacitance ($C_2$) were considered to be due to deposition of Mn on base of pore. The electrochemical behavior of barrier layer and porous oxide layer on Al have been characterized by capacitance ($C_b$) and Young capacitance ($C_Y$) in equivalent circuit model.
오한준(Han-Jun Oh),정용수(Yongsoo Jeong),지충수(Choong-Soo Chi) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.5
For an application as templates of high performance with proper pore size and shape, porous anodic alumina films were prepared by anodization in oxalic acid, and formation behaviors of anodic alumina layer as well as dissolution process in acid solution have been investigated. The surface characteristics on anodic alumina layer were shown to be dependent on the fabrication parameters for anodization. For the dissolution behaviors of anodic alumina, the thickness of the barrier-type alumina layer decreased linearly with the rate of 0.98 ㎚/min in H3PO4 solution at 30℃. The changes of the anodic alumina layers were analyzed by SEM and TEM.