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정철균,김성욱,Jung, Chul-Gyun,Kim, Sung-Uk 한국전산구조공학회 2016 한국전산구조공학회논문집 Vol.29 No.1
복합재는 높은 비강도와 비강성을 가지고 있어 자동차, 항공기 등 전반적인 산업분야에서 널리 사용되는 재료이다. 우주선의 노즐 부분과 같이 높은 온도뿐만 아니라 높은 압력이 작용하는 환경에서 사용하기 위한 재료로 복합재가 필요하다. 복합재의 물성치를 아는 것은 매우 중요한데 모재(matrix)와 강화섬유(fiber) 각각의 물성치를 수치적으로 대입해 얻는 결과는 실험값과의 오차가 커 예측하는데 있어 더 정확한 방법이 필요할 것이다. 본 연구에서는 유한요소법을 이용한 EDISON용 CASAD solver 프로그램을 활용해 분석하였다. matrix와 fiber의 물성치를 대입해 복합재의 물성치를 구해 실험으로 측정된 물성치, 경험식으로 계산된 물성치와 비교를 하였다. Composites are materials that are widely used in industries such as automobile and aircraft. The composite material is required as a material for using in a high temperature environment as well as acting as a high pressure environment like the nozzle part of the ship. It is important to know the properties of composites. Result values obtained substituting the properties of matrix and fiber numerically have an large error compared with experimental value. In this study we utilize CASADsolver EDISON program for using Finite Element Method. Properties by substituting the fiber and Matrix properties of the composite material properties were compared with those measured in the experiment and calculated by the empirical properties.
자전연소합성법으로 제조된 SiO<sub>2</sub> 첨가된 MoSi<sub>2</sub> 분말 내에서의 SiO<sub>2</sub>의 거동 연구
나사균,전민석,송준광,한동빈,정철원,김성수,이연승,Rha, Sa-Kyun,Jeon, Min-Seok,Song, Jun-Kwang,Han, Dong-Bin,Jeong, Cheol-Weon,Kim, Sung-Soo,Lee, Youn-Seoung 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
In order to investigate the behavior of $SiO_2$ in the molybdenum silicide powders, crystal structure of these powders was measured by XRD, in addition, surface composition and surface phase (or chemical states) and microstructure were analysed by XPS and TEM, respectively. Mo-silicide powders containing $SiO_2$ were synthesized by SHS (Self-Propagating High-Temperature Synthesis) technique. In XRD result, according to increase of $SiO_2$ contents, the crystal structure for synthesized $MoSi_2$ powders was still typical $MoSi_2$ bct without any other phases. By XPS analysis, the surface of Mo and Si source powders was covered with $MoO_3$ and $SiO_2$, respectively, and the surface of synthesized $MoSi_2$ powder was also covered with $MoO_3$ and $SiO_2$, which were stable oxides at room temperature. However, according to increase of $SiO_2$ addition, $MoSi_2$ phase in XPS spectra decreased and $SiO_2$ phase increased relatively in synthesized $MoSi_2$ powders. From the results by XPS and XRD, we found that the existent $SiO_2$ has amorphous structure. In the microstructure, the small particulates of the synthesized products added $SiO_2$ agglomerated together to form larger clusters (from ~10 nm to ~1 ${\mu}m$). From TEM, XPS, and XRD results, we found that the out layer of agglomeration of synthesized $MoSi_2$ powder is surrounded by amorphous $SiO_2$.
손상균 ( Sang Kyun Sohn ),정철원 ( Chul Won Jung ),조덕연 ( Deog Yeon Jo ),정준원 ( June Won Cheong ),대한혈액학회만성골수성백혈병연구회 ( Chronic Myelogenous Leukemia Working Party The Korean Societ ),김대영 ( Dae Young Kim ),이정옥 ( 대한내과학회 2015 대한내과학회지 Vol.88 No.4
Background/Aims: The first edition of the Korean treatment guidelines for chronic myelogenous leukemia (CML) was published in 2006. We intend to update those guidelines to include the use of next-generation tyrosine kinase inhibitors (TKIs). Methods: New guidelines were developed in 2012 based on the results of a survey and a consensus meeting of various Korean experts, the reports of recent clinical studies, and updated guidelines from external study groups. Results: An assessment of risk factors is strongly recommended before treating newly diagnosed chronic phase CML. Imatinib, dasatinib, and nilotinib are reimbursable in Korea as first-line treatments, and the patient`s age, comorbidities, and possible adverse events should be considered in the choice of treatment. Molecular studies are recommended for assessing treatment efficacy instead of invasive cytogenetic response evaluations, and an early response is believed to correlate with a good prognosis. Second-line TKIs can be considered for patients who fail or are intolerant of first-line therapy, pending analysis of ABL tyrosine kinase mutation status. For treating advanced stages, a combination of TKIs with cytotoxic agents and hematopoietic cell transplantation is recommended. The adverse effects of TKI therapy can be managed via dose reduction and supportive care, or switching to an alternate TKI. Conclusions: The use of TKIs has improved the outcome of CML treatment. Treatment-free remission after discontinuing TKIs might be possible in select patients who achieve sufficient response, indicating that curative treatment for CML can be expected in the future.
다양한 산화물 기판 위에 RF 마그네트론 스퍼터링 방법으로 성장된 ZnO 박막의 특성 비교
이재욱,정철원,한석규,최준호,홍순구,조형균,송정훈,이정용,Lee, Jae-Wook,Jung, Chul-Won,Han, Seok-Kyu,Choi, Jun-Ho,Hong, Soon-Ku,Cho, Hyung-Koun,Song, Jung-Hoon,Lee, Jeong-Yong 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4
ZnO thn films are grown on five kinds of oxide substrates including $c-Al_2O_3(0001),\;r-Al_2O_3(01-12)$, MgO(100), MgO(111), $NdGaO_3(110)$ by rf magnetron sputtering and effects substrate types on properties of ZnO thin films ate investigated. In order to compare the substrate effects one growth condition is selected and all the films are grown by the same growth condition. Structural and optical properties of the ZnO films ate different depending on the substrates although the films ate not epitaxial but polycrystalline. The ZnO film grown on $NdGaO_3(100)$ substrate shows the best overall properties among the films grown on substrates investigated in this study.