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염수전기분해에서의 낮은 에너지 소비를 위한 높은 성능 및 내구성을 가지는 이중층 막 개발
오창훈,황진표,박인기,이창현 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.11
Chlor-alkali (CA) membranes as key materials to generate chlorine gas and sodium hydroxide are composed of sulfonic acid layer (S-layer) and carboxylic acid layer (C-layer) to provide fast sodium ion transport and slow hydroxide ion diffusion, respectively. Aciplex F, a representative CA membrane is made in a double layer form via thermal adhesion of both layers after each single layer film is independently fabricated. Unfortunately, the membrane fabrication induces delamination particularly in their interface as a result of hydroxide ion diffusion occurring during CA operation, leading to rapid increase in electrochemical overpotential. In this study, selective chemical conversion technique was developed to solve the delamination issue. Their effectiveness was proved by applying the same concept to a wide range of PFSA membrane.
오창훈,강민욱,한재원 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
We measure the density of atomic chlorine radicals in inductive coupled plasma (ICP) with an optical emission spectrometer (OES). Our results revealed a transition point in the dissociation rate of molecular chlorine with respect to radio frequency (RF) power; above the transition point, the signal interference in the measurement of atomic chlorine radical density by dissociated molecular chlorine becomes negligibly small. Based on the dissociation rate of the molecular chlorine, we determine appropriate conditions for accurate measurement of atomic chlorine radical density with an uncertainty of less than 2.4%. By applying argon-based optical actinometry, we measure the distribution of atomic chlorine radical density on a 12-inch wafer to predict the chrome ICP etch process used to fabricate lithographic photomasks in the semiconductor industry. We also find that the distribution of atomic chlorine radical density is in good agreement with the etch rate of the chrome thin film.
다중모듈구조를 이용한 역전파 신경회로망의 문자인식성능 향상에 관한 연구
오창훈,홍봉화,조원경 慶熙大學校 1994 論文集 Vol.23 No.-
This paper proposes the multi-modular neural network and compensative input algorithm. The former is to reduce convergence speed which is one of the neural network´s inveterate problems, and the latter is to improve the improve the recognition performance of neural network. This paper consists of two major parts and a simulation. First, it shows the structure of multi-modular neural network. This structure apply to recognition of characters: Korean, English and Number. Second, it described the compensative input algorithm and showed steps that determined the compensative input. Multi-modular neural network and compensative input algorithm proposed is tested and is compared with existing neural network in recognition of characters: Korean, English and Number. The convergence speed is faster three or more than existing neural network´s. In the case that compensative input was applied to neural network, recognition rate was improved more than 10%.
오창훈,박남수,김재민,김민욱 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.6
Objective To determine an ideal stimulation site of the medial antebrachial cutaneous nerve (MACN) using ultrasound measurement and to compare the efficiency of the new stimulation site with the conventional stimulation site on the nerve conduction study.Methods Both arms of 15 healthy participants were measured using ultrasound. The MACN was identified in the transverse view at each 0, 2, 4, 6, and 8 cm proximal sites from the medial epicondyle, and the distances to the median nerve and to the skin from the MACN were measured. The ideal stimulation site should be located at the level which can give the shortest distance from the skin and the longest distance from the median nerve in terms of volume conduction. To confirm the efficiency of the ideal site, we measured the amplitude of the MACN conduction study at the ideal site against one at the 4 cm proximal to the medial epicondyle (conventional site).Results The ultrasound showed the ideal stimulation site for the MACN could be the elbow crease line. However, the nerve conduction study revealed that the amplitudes of the MACN were significantly larger at the 4 cm proximal to the medial epicondyle compared with ones at the ideal site.Conclusion The ideal stimulation site based on the ultrasound did not permit better stimulation site for the nerve conduction study of the MACN compared with the conventional site. Careful adjustment of the stimulation site on the basis of this study would contribute to an accurate conduction study of the MACN.
폐쇄성 요로질환의 평가를 위한 T2 강조 자기공명 요로조영술과 조영증강 자기공명 요로 조영술의 유용성: 하행성 신우조영술과의 비교연구
오창훈,이정민,진공용,정경호,조승일,이상훈,오경재,김영곤,Oh, Chang-Hoon,Lee, Jeong-Min,Jin, Gong-Yong,Chung, Gyung-Ho,Cho, Seung-Il,Lee, Sang-Hun,Oh, Gyung-Jae,Kim, Young-Kon 대한영상의학회 2002 대한영상의학회지 Vol.46 No.1
목적: 폐쇄성 요로질환 환자에서 폐쇄의 위치와 폐쇄원인의 평가에 있어 T2 강조 자기공명 요로조영술 (Magnetic Resonance Urography;이하 MRU)과 조영증강 자기공명 요로조영술의 유용성을 하행성 신우조영술과 비교하여 알아보고자 하였다. 대상과 방법: 폐쇄성 요로질환이 의심되어 MRU를 시행하고 경피적 신루설치술(Percutane-ous nephrostomy,이하 PCN)후 하행성 신우조영술(Antegrade pyelography, 이하 AGP)을 얻은 25명의 환자를 대상으로 하였다. Half-Fourier acquisition single-shot turbo spin-echo(HASTE)기법을 이용한 T2 강조 MRU와 3-Dimensional fast imaging with steady state precession (3-D FISP)기법을 이용한 T1 강조 조영증강 MRU 영상을 획득하였다. 이 두MRU 영상 기법을 AGP를 기준으로 신우신배의 형태학적 묘출 정도와 요로 폐쇄의 원인에 대하여 비교 평가하여 정성적으로 분석하였으며, 요로폐쇄의 위치, 종류에 대해서는 AGP를 기준으로 HASTE와 3-D FISP 기법간의 일치도를 비교 분석하였다. 결과: 신우신배의 형태학적 묘출은 3-D FISP을 이용한 조영증강 MRU가 T2 강조 MRU에 비하여 더욱 우수하였다 (p=0.002). 폐쇄부위 위치에 대한 분석에서 AGP와 비교하여 HASTE 기법을 이용한 T2강조 MRU는 19예 (76%), 3-D FISP을 이용한 조영증강 MRU는 21예 (84%)에서 일치도를 보였다. 폐쇄의 종류에 대한 분석에서 AGP와 비교하여 HASTE기법은 18예 (72%),3-D FISP 기법은 22예 (88%)에서 일치도를 보였다. 요로폐쇄 원인에 대한 평가에서는 3-D FISP을 이용한 조영증강 MRU가 T2 강조 MRU에 비하여 더욱 우수하였다(p=0.003). 결론: T2강조 MRU와 T1강조 조영증강 MRU는 요로폐쇄 질환의 평가에 서로 보완적인 정보를 제공하였으며, 이들 기법을 이용한 자기공명 요로조영술은 요로폐쇄 질환의 형태학적 및 기능적 평가에 도움을 주어 불필요한 침습적 검사의 사용을 줄일 수 있을 것으로 사료된다. Purpose: To compare the efficacy of contrast-enhanced and T2-weighted magnetic resonance urography (MRU) for the depiction of obstruction and evaluation of the causes of obstructive uropathy with that of antegrade pyelography. Materials and Methods: Twenty-five patients with obstructive uropathy who underwent percutaneous nephrostomy (PCN) and antegrade pyelography (AGP) were included in the study. We performed MR urography, comprising half-Fourier acquisition single-shot turbo spin-echo (HASTE) T2-weighted imaging and 3-D fast imaging with steady state precession (3-D FISP) T1-weighted imaging after gadolinium enhancement and compared the quality of the images of both the HASTE and 3-D FISP MRU techniques in terms of their depiction of the dilated pelvocalyceal system, and the level, type, and causes of obstruction. Results: In terms of anatomical depiction of the pelvocalyceal system (p=0.002) and the causes of obstruction (p=0.003), T1-weighted MRU using 3D-FISP was significantly better than T2-weighted MRU using the HASTE sequence. Regarding level of obstruction, T2-weighted MRU using the HASTE sequence and contrastenhanced T1-weighted MRU using 3D-FISP showed an accuracy of 76% (19/25) and 84% (21/25), respectively. In terms of type of obstruction, the accuracy of T2-weighted MRU and T1-weighted CEMRU was 72%(18/25) and 88% (22/25), respectively. Conclusion: T2-weighted MRU and T1-weighted CEMRU provided both anatomical information and that relating to impaired renal function. The two modelities played a complementary role and their use could decrease the unnecessary use of invasive diagnostic examination for the evaluation of obstructive uropathy.