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플라즈마 가스와 RF 파워에 따른 NiO 박막의 우선배향성 및 표면형상 변화
류현욱,최광표,노효섭,박용주,권용,박진성,Ryu Hyun-Wook,Choi Gwang-Ryo,Noh Whyo-Sup,Park Yong-Ju,Kwon Yong,Park Jin-Seong 한국재료학회 2004 한국재료학회지 Vol.14 No.2
Nickel oxide (NiO) thin films were deposited on Si(100) substrates at room temperature by RF magnetron sputtering from a NiO target. The effects of plasma gas and RF power on the crystallographic orientation and surface morphology of the NiO films were investigated. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) were employed to characterize the deposited film. It was found that the type of plasma gases affected the crystallographic orientation, deposition rate, surface morphology, and crystallinity of NiO films. Highly crystalline NiO films with (100) orientation were obtained when it was deposited under Ar atmosphere. On the other hand, (l11)-oriented NiO films with poor crystallinity were deposited in $O_2$. Also, the increase in RF power resulted in not only higher deposition rate, larger grain size, and rougher surface but also higher crystallinity of NiO films.
대한응급의학회지에 게재된 연구의 부적절한 사후‐검정력 분석
류현욱,이미진,최마이클승필,김종근 대한응급의학회 2013 대한응급의학회지 Vol.24 No.4
Purpose: Negative studies provide valuable information. However, conducting studies with inadequate power is unethical and an inefficient use of resources. Moreover,inaccurate interpretations from underpowered studies result in false conclusions that alter clinical interventions and deter further research. The purpose of this study was to determine the prevalence of negative studies with inadequate power in the Journal of the Korean Society of Emergency Medicine (JKEM). Methods: We assessed all papers in JKEM from 2009 to 2012. We sought published evidence that a post-hoc power analysis had been performed in association with the main hypothesis of the paper. All clinical research studies containing the phrase “no difference” were identified. Data necessary for power calculation were extracted from applicable studies. Results: There were a total of 351 papers in which a statistical comparison was undertaken. Out of 351 original articles,170(48.4%) were negative studies that contained enough information for analysis. Out of 126 negative studies in JKEM, only 21(16.7%) had performed a power analysis demonstrating adequate sample size. In addition, only 6.3% of dichotomous variable articles and 10.3% of continuous variable articles had adequate power. Levels of adequate power in negative studies did not improve over time (p=0.148). Conclusion: Many negative studies in JKEM are inconclusive because they lack the adequate power to detect even large differences between groups. Therefore, it is imperative to consider power when interpreting the literature. When designing future research, power calculations should be performed to ensure sufficient patient recruitment to attain clinically meaningful results.
아르곤 플라즈마 응고 소작법에 의해 치료된 뾰족콘딜로마 1예
류현욱,이세영,윤영득,여주천,김새롬,권영란,김준철,강병준,박창근,이상문,구미진 대한소화기내시경학회 2006 Clinical Endoscopy Vol.33 No.5
Condyloma acuminatum (CA) is a common sexually transmitted disease caused by the human papillomavirus. In gastrointestinal practice, we generally encounter this disease in the anal canal but rarely in the rectum during a colonoscopy. There are many therapeutic options for CA including chemical or physical destruction, immunological therapy, or a surgical excision. All these procedures have some degree of limitations such as limited clearance rate, high recurrence rate, long duration of therapy, bleeding, release of potentially infectious aerosols, scarring etc. With argon plasma coagulation (APC), which is more available than lasers in gastrointestinal practice, a high frequency current flows through the argon plasma to the tissue, allowing well-controlled superficial tissue destruction without any direct contact between the probe and the tissue. We present a case of anal CA that was treated successfully with APC during a colonoscopy with no recurrence during the follow up. (Korean J Gastrointest Endosc 2006;33:318-321) 뾰족콘딜로마는 주로 성접촉에 의해 전파되는 human papillomavirus (HPV) 감염에 의해 성기나 항문 주위에 발생하는 사마귀의 일종이다. 이 질환은 타인에 대한 전염원이 될 수 있다는 점과 피부 및 점막의 상피성 종양과의 연관성 등으로 적절한 치료가 필요하다. 치료는 국소도포요법, 냉동요법, 전기소작술, 레이저응고술, 외과적 절제술 등 다양하게 있으며, 병변의 수, 크기, 위치, 치료에 대한 순응도 및 면역 상태 등에 따라 적절한 치료방법을 선택한다. 하지만 최근 내시경 부속기구의 발달로 항문관에서 발견되는 작은 병변의 경우 내시경 치료를 고려해 볼 수 있을 것으로 보인다. 61세 남자 환자가 건강 검진 목적으로 시행한 대장내시경 검사에서, 항문관에 전형적 뾰족콘딜로마의 소견인 다발성 유두상 돌기를 가지는 사마귀양 용종이 관찰되어 아르곤 플라즈마 응고 소작법으로 제거하였다. 시술 후 특별한 합병증은 없었으며, 4개월 후 시행한 추적내시경 검사에서 재발 소견은 보이지 않아 효과적으로 치료되었다고 판단되는 증례를 경험하여 보고하고자 한다.
A study on accounting information disclosure in real estate market
류현욱,이영호 국제부동산정책학회 2015 토지와건물 Vol.30 No.-
This study looks into accounting information disclosure in real estate market. Though further implications might be dependent upon empirical analysis, literature review provide insight into the informational role of accounting disclosure. Whether relevant information quality affects required rate of return could be upon the higher quality accounting information, in other way lowering liquidity risk. Further analysis is expected utilizing Capital Asset Pricing Model (CAPM) to see if there is any significant results.
RF 마그네트론 스퍼터링에 의한 NiO 박막 증착시 산소 유량비가 박막의 결정 배향성에 미치는 영향
류현욱,최광표,노효섭,박용주,박진성 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.2
Nickel oxide (NiO) thin films were prepared on Si(100) substrates at room temperature by RF magnetron sputtering using a NiO target. The effects of oxygen flow ratio for the plasma gas on the preferred orientation and surface morphology of the NiO films were investigated. Highly crystalline NiO film with (100) orientation was obtained when it was deposited in pure Ar gas. For NiO film deposited in pure O$_2$ gas, on the other hand, the orientation of the film changed from (100) to (111) and its deposition rate decreased. The origin of the preferred orientation of the films was discussed. NiO films also showed different surface morphologies and roughnesses with the oxygen flow ratio. NiO 산화물 타겟을 이용한 RF 마그네트론 스퍼터로 상온에서 Si(100) 기판 위에 NiO 박막을 증착시켜, 스퍼터 가스의 산소 유량비가 NiO 박막의 결정 배향성과 표면 형상에 미치는 영향을 조사하였다. Ar 가스에서 증착된 NiO 박막은 높은결정화도와 (100)면의 우선 배향성을 나타내었으나, $O_2$ 가스에서 증착된 경우에는 (111)면의 우선 배향성을 보였으며 그 증착속도도 감소하였다. 스퍼터 가스의 $O_2$ 함량에 따른 NiO 박막의 결정성과 우선배향성 변화에 대한 요인을 고찰하였으며, 박막의 표면 형상과 거칠기의 변화를 조사하였다.