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이남훈(Lee, Nam-Hun),권정민(Kwon, Jeong-Min),구자춘(Koo, J.C.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
As functional requirement of massive digital information storage devices are on a trend for the higher data transfer rate and lower cost, many different technical efforts are being tested and implemented in the industry. FDB(fluid dynamic bearing) is one of the major breakthroughs in rotor design in terms of TMR(track misregistration) budget. Although FDB analysis based on Reynolds' equation is well established and popularly being used for FDB design especially for the estimation of bearing stiffness, there are obvious limitations in the approach due to the inherent assumptions. A generalized analysis tool employing the full Navier-Stokes equation and the energy balance is to be beneficial for detailed FDB design. In this publication, an efficient geometry modeling method is presented that provides fully integrated inputs for general FVM/FDM(finite volume method/ finite difference method) codes. By virtue of the flexibility of the presented method, many different detailed FDB design and analysis are carried over with ease.
유무기 하이브리드 티타늄 착화합물을 이용한 티타니아의 제조 방법 및 성장 거동에 대한 연구
강유빈,최진주,권남훈,김대근,이근재,Kang, Yubin,Choi, Jin-Ju,Kwon, Nam Hun,Kim, Dae-Guen,Lee, Kun-Jae 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
Titanium dioxide (TiO<sub>2</sub>) is a typical inorganic material that has an excellent photocatalytic property and a high refractive index. It is used in water/air purifiers, solar cells, white pigments, refractory materials, semiconductors, etc.; its demand is continuously increasing. In this study, anatase and rutile phase titanium dioxide is prepared using hydroxyl and carboxyl; the titanium complex and its mechanism are investigated. As a result of analyzing the phase transition characteristics by a heat treatment temperature using a titanium complex having a hydroxyl group and a carboxyl group, it is confirmed that the material properties were different from each other and that the anatase and rutile phase contents can be controlled. The titanium complexes prepared in this study show different characteristics from the titania-formation temperatures of the known anatase and rutile phases. It is inferred that this is due to the change of electrostatic adsorption behavior due to the complexing function of the oxygen sharing point, which crystals of the TiO<sub>6</sub> structure share.