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레이저 용접을 이용한 알루미늄 Fuel Filler Neck 개발
박홍석(H.S. Park),이병진(B.J. Lee),정상영(S.Y. Jeong),황현태(H.Tae Hwang),김재철(J.C. Kim),정학순(H.S. Jeong),최흥원(H.W. Choi) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Normally, material of filler neck is made with carbon steel, plastic and stainless so that it causes problems like weight gain and lack of durability. To being solve the problems, I suggest to develop filler neck made with aluminum which is environment-friendly recyclable material. However, according to character of aluminum, it can be caused welding faulty or thermal strain during welding. For solving these problems, aluminum fuel filler neck should be developed by the laser welding which is drawing the best designed value and high qualified welding and speeded welding. It has to consider the applicability via prototype testing. This thesis was achieved mechanism design skill and manufacture skill by performance about fuel filler neck development with laser welding. Based on this performance, it will improve auto’s light weight and recycling and cut down on expenses for the next auto. It is expected to contribute that it makes auto parts manufacturers get a competitive price, high quality, efficiency, productivity.
LaAlO₃ 에 대한 열자극발광 스펙트럼의 광학적 분석
이정일(J . I . Lee),문정학(J . H . Moon),김덕훈(D . H . Kim) 한국안광학회 1999 한국안광학회지 Vol.4 No.2
We measured and analyzed thermoluminescence spectra of LaAlO₃, single crystal by 3 dimensional data for temperature, wavelength and luminescence intensity. LaAlO₃, has used as the substrates of YBCO(superconductor) or semiconductors. We could determined the energy of recombination center, that is impossible through analysis of glow curve data. We could obtained the energy through analysis of the spectrum data at peak temperature by Franck-Condon model. The total glow curve was deconvoluted to three glow curves by curve fitting method. The activation energies were 0.54eV, 0.91eV and 1.02eV respectively. The energies of recombination centers were determined with 2. 04eV and 2.75eV from the analysis of luminescence intensity data for wavelength.
정준규(J. K Jung),이정학(J. H. Lee),이창욱(C. W. Lee),서응렬(E. Y. Seo),박용종(Y. J. Park),권명근(M. K. Kwon) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Recently, convection heat transfer has been implemented to commercial ovens to enhance heat and mass transfer. In addition to that, conduction and radiation are also closely bound to cooking performance of an oven. Nonetheless, many unknowns regarding cooking performance are yet present due to the lack of clear understanding on heat transfer mechanisms during oven cooking. In this study, particle image velocimetry(PIV) was employed to investigate the flow field, of an oven, in which convection plays a dominant role in heat and mass transfer. Various aspects of flow (stream wise an d cross - stream wise) were studied and compared to CFD results for further analysis, which will lay a groundwork on optimal design of a commercial oven.
LiF : Mg , Cu , Na , Si TL 물질의 열자극발광스팩트럼 측정 및 분석
이정일(J . I . Lee),문정학(J . H . Moon),김덕훈(D . H . Kim) 한국안광학회 2001 한국안광학회지 Vol.6 No.1
Three-dimensional thermoluminescence(TL) spectra of LiF: Mg. Cu, Na. Si TL material based on temperature. wavelength and intensity were measured and analyzed. The glow curves were obtained by integration of luminescence intensity for wavelength at each temperature. and various trapping parameters related to the trap formation were determined by analyzing these curves. Computerized glow curve deconvolution(CGCD) method which based on general order kinetics(GOK) model were used for the glow curve analysis. The glow curves of LiF : Mg. Cu. Na, Si TL material were deconvoluted to six isolated glow curves which have peak temperature at 333 K. 374 K. 426 K. 466 K. 483 K and 516 K, respectively. The 466 K main glow peak had an activation energy of 2.06 eV and a kinetic order of 1.05. This TL material was also found to have three recombination centers. 1.80 eV, 2.88 eV and 3.27 eV by TL spectra analysis based on Franck-Condors model. It showed that 2.88 eV is the dominant center. followed by 3.27 eV level, and 1.80 eV center is ascertained as emission center of this material even though its very weak emission intensity.