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이화준,최우석,김형준,Wei Pan,Mohammad Shahid,류성수 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
A MgO-CaO-Al2O3-SiO2 (MCAS) nanocomposite powder with aparticle size of 50 nm and a specific surface area of 40.6 m2/g wassuccessfully synthesized via heat-treatment of polymeric precursorscontaining Mg, Ca, Al and Si in air at 700 °C for 5 h. It wascharacterized as a novel sintering additive for the densificationAlN ceramics at a low temperature below 1600 °C. It was foundthat the nanosized MCAS powder was suitable for thedensification of AlN ceramics. In particular, full densificationcould be achieved when only 1.0 wt% MCAS additive-doped AlNpowder compact was sintered for 1 h at 1600 °C, and a thermalconductivity of 84 W/m·K was attained.
신경망을 이용한 펄스드 이온에너지의 SiN 표면 거칠기에의 영향 모델링
이화준,김병환 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.10
본 연구에서는 이온에너지와 박막 표면 거칠기와의 관계를 신경망을 이용하여 모델링하였다. Pulsed 플라즈마 증착장비를 이용하여 상온에서 실리콘 나이트라이드 (SiN)을 증착하였다. 바이어스 전력과 duty ratio는 각각 40~100W와 30~90%로 변화하였다. 이온에너지 정보는 비침투식 이온에너지 분석시스템을 이용하여 수집하였다. 신경망의 성능은 유전자알고리즘을 이용하여 최적화시켰다. 최적화한 모델은 이온에너지의 영향을 고찰하였다. 모델로부터 고 이온에너지는 저 이온에너지가 높은 조건에서 증가시킬 때에 표면 거칠기를 보다 작게 한다는 것을 알 수 있었다.
Treatment of Lymphocytic Gastritis with Cyclosporine in a Cat
이화준,안병우,박소영,양만표,강지훈 한국임상수의학회 2014 한국임상수의학회지 Vol.31 No.2
A 7-year-old spayed female domestic shorthair cat was referred for chronic intermittent vomiting. Thefrequency of vomiting increased recently, and the cat showed anorexia at presentation. There were no remarkableabnormalities on the blood analyses and diagnostic imaging. However, the endoscopic examination revealed focalerosions of the gastric body mucosa, and subsequent multiple biopsies were obtained. Histopathologic examinationindicated mild to moderate lymphocytic gastritis. The vomiting was completely disappeared 7 days after theadministration with prednisolone (PDS). However, because of side effects caused by the long-term PDS administration,cyclosporine was added on the prescription with tapered dose of PDS. The dog’s condition improved with continuedcyclosporine treatment, and no further vomiting and anorexia episodes have been noted. This case describes thesuccessful management with administration of cyclosporine in feline lymphocytic gastritis.
나노크기의 ZrO<sub>2</sub>와 Graphite 분말 혼합체의 열탄소환원법에 의한 고분산 초미립 ZrC 분말의 합성
이화준,류성수,Lee, Wha-Jun,Ryu, Sung-Soo 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.2
Ultra-fine zirconium carbide (ZrC) powder with nano-sized primary particles was synthesized by the carbothermal reduction method by using nano-sized $ZrO_2$ and nano-sized graphite powders mixture. The synthesized ZrC powder was well dispersed after simple milling process. After heat-treatment at $1500^{\circ}C$ for 2 h under vacuum, ultra-fine ZrC powder agglomerates (average size, $4.2{\mu}m$) were facilely obtained with rounded particle shape and particle size of ~200 nm. Ultra-fine ZrC powder with an average particle size of 316 nm was obtained after ball milling process in a planetary mill for 30 minutes from the agglomerated ZrC powder.
이화준,박인보 한국외국어대학교(글로벌캠퍼스) 중동연구소 2019 중동연구 Vol.37 No.3
This paper tries to argue that two geographically neighboring nations, Qatar and Abu Dhabi, pursued similar cultural policies in pursuit of a similar national identity, leading to political conflicts between the two states. We examine the context of cultural policies and political conflicts in these two nations and analyze the background of the rivalry between the two nations. The background of the rivalry between the two nations was largely due to the conflicts between the cultural policies of the two nations. Here, the similarity of the national identities that they tried to construct through cultural policies was meaningful. The national identities of both nations is not traditionally tracing back. The similarity of national identities poses a challenge of mutual ideology in that it suggests questions at the dimension of national idea. The operation of cultural policies in the process of rivalry between Qatar and Abu Dhabi has the following implications. The first is that a similar or common national identities can lead to political disputes among nations. Second, it is necessary to examine domestic policies context in terms of political disputes rather than military conflicts. These movements by two nations occurred after the political conflicts between the two nations had developed. Therefore, the context of political conflicts should be dealt with in order to analyze the rivalry between the two sides.