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이근형,김민성 대한금속·재료학회 2010 ELECTRONIC MATERIALS LETTERS Vol.6 No.2
This study investigated the dependence of crystal structure on growth temperature in the TiO₂ thin films deposited on c-, a-, and r-plane sapphire substrates by reactive RF magnetron sputtering. Deposition of the films was carried out at temperatures ranging from 400°C to 700°C. X-ray diffraction patterns revealed that TiO₂with a rutile structure was epitaxially grown on substrates independent of substrate orientations. TiO₂thin films were grown with a dominant peak of (200) on c-plane sapphire, and their crystallization and crystal quality were improved with growth temperature. For the films formed on a-plane and r-plane sapphires, the preferential orientation was [101]. However, the intensities of the (101) peak were very weak and were not dependent on growth temperature. The TiO₂ thin films formed on the sapphire had a band gap of about 3.7 eV, which was larger than that of bulk (3.03 eV).
유연생산시스템의 투입우선순서결정을 위한 Simulated Anneaing의 적용
이근형,황승국,이강우 한국산업경영시스템학회 2000 한국산업경영시스템학회지 Vol.23 No.54
One form of job shop scheduling problem in contemporary automated manufacturing such as flexible manufacturing systems (FMS's) is presented which we call the FMS dispatching priority problem. The FMS dispatching priority problem seeks the best dispatching priority of parts and operations, and is essentially a combinatorial optimization problem. Because of the complicated mechanism of the system, the performance of a given dispatching priority must be evaluated via simulation. Simulated annealing have been applied to the problem, and it is found that appropriate parameter setting will be desirable to get good, if not the optimal, solutions within a limited amount of time under the presence of heavy computational burden due to simulation. More specifically, experiments reveal that initial temperature is the single most important factor among other parameters and factors, and that the appropriate initial temperature depends on the allowable computer time in such a way that the less time one can afford to spend, the lower the appropriate initial temperature should be.
공기 중에서 열증발법에 의하여 제작된 정팔면체 ZnO 결정
이근형,Lee, Geun-Hyoung 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.4
ZnO crystals with octahedral shape were synthesized by thermal evaporation technique. $ZnF_2$ powder was used as the source material. The thermal evaporation and oxidation of $ZnF_2$ powder was carried out for 1 hr at $1,000^{\circ}C$ in air under atmospheric pressure. SEM images showed that the ZnO crystals produced by oxidizing $ZnF_2$ vapor possessed a characteristic octahedral shape. XRD spectrum revealed that the ZnO octahedron had hexagonal wurtzite structure. In the room temperature photoluminescence spectrum, a strong green emission peak at around 510 nm was observed.
공기 중 대기압 분위기에서 Zn의 산화에 의해 생성된 Tetrapod와 Multipod 형태의 나노구조와 음극선 발광 특성
이근형,Lee, Geun-Hyoung 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.3
ZnO nanostructures with tetrapod, needle and multipod shapes were synthesized without catalysts through a simple thermal oxidation of metallic Zn powder in alumina crucible under air atmosphere. X-ray diffraction data revealed that the ZnO nanostructures had wurtzite structure of hexagonal phase. Energy dispersive X-ray (EDX) spectra showed that the ZnO was of high purity. After the oxidation of Zn powder, white colored product was mainly observed and yellow colored product was observed only a very little on the surface of the oxidized source materials. The white product consisted of tetrapods, while yellow product was composed of needles and multipods. Cathodoluminescece spectra showed that the crystalline quality of tetrapods was better that those of needles and multipods.