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박래준,배정운,박종윤 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.2
B-A type hot cathode ionization gauge to measure the UHV(Ultra High Vacuum) was generally used in these days. Whereas, HV(High Vacuum) is still major pressure region in the application of vacuum to the industry. Conventional triode gauge(CTG) is used mainly for measurement in HV region, thus we constructed the modified triode gauge(MTG). In order to find the optimum condition of MTG. We measured I_e vs U_c, I_e vs U_g and U_c, I_e vs U_g and P, I_i vs U_g and P as well as I_i vs P because I_i is depend on pressure(P), filament potential(U_c), grid potential(U_g), filament heating power(Hp), and emission current(I_e). The good linearity of I_i P curve is obtained from ∼10^-6 to ∼10^-4 torr at 5A heating current, 200V grid potential, 40V filament potential and below ∼10^-7 torn at 4.6A.
PES를 이용한 Mg/Si(111)계의 초기 성장모드 연구
안기석,박래준,김정선,박종윤 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.2
LEED와 PES를 이용하여 Si(111)7×7 표면위에 흡착된 Mg의 초기 성장모드를 연구하였다. 상온∼200℃의 기판온도에서 흡착초기에서부터 Mg silicide의 형성을 관측할 수 있었고 이 구조는 최종적으로 2/3√3×2/3√3 R30° 구조의 LEED pattern을 가진 epitaxial silicide로 완성되었다. 계속된 Mg의 흡착은 이 silicide 위로 Mg bulk가 무질서하게 성장됨을 보여준다. 또한 300, 450℃의 기판온도에서는 각각 1×1 그리고 3×1 구조가 관측되었다. The initial growing mode of Mg adsorbed on Si(111)7×7 surface has been studied by low energy electron diffraction (LEED) and photoelectron spectroscopy(PES). With increasing deposition time, the LEED pattern was changed to diffuse 7×7, diffuse 1×1 and 2/3√3×2/3√3 R30° structures at room temperature, successively. Also, we observed the 1×1 and 3×1 patterns at 300 and 450℃, respectively. From the Leed and PES results, it has been found that a Mg silicide is formed at the initial adsorption stage and that the 2/3√3×2/3√3 R30° structure is responsible for the thin epitaxial Mg silicide at RT∼200℃.
학교체육 활성화 방안에 대한 연구(Ⅰ) : 강원대학교 교양체육 운영방법의 개선을 중심으로
이광재,문병용,노성규,박기동,홍관이,한상준,유옥재,엄기진,정청자,오수일,김윤래,박장평,부기원 江原大學校附設 體育科學硏究所 1986 江原大學校附設體育科學硏究所論文集 Vol.- No.11
Try to find a scheme for activation to College Physical Education, this Report informs the various kinds of Survey and process those were projected for improvement of management methods on Cultural Physical Education in Kang Weon National University. From experimentally carried out "Sports events Choosing System" not as usual be inforced "Total practical Skill System", Following Positive effects and sujestions were Presented; 1. "Sports events choosing system" gave birth to more students' interesting and more voluntary participation to the sports events they chose, and sports skill and instruction level was elevated due to charge of expert according to each sports events. This system would be managed continuously hereafter for it related to life sports. 2. This System needs to closed cooperations between College and Community, for the facilities of community are utilized by college. 3. To complete the plan for activation of college Physical Education, additionally, the successional study ; namely "autonomous extracurricular sports activity" should be excuted hereafter.
Cu가 흡착된 Si(100) - 2×1 표면의 원자구조 및 전자구조 연구
박래준(Rae-Jun Park),김정선(Jeong-Seon Kim),황찬국(Chan-Cuk Hwang),안기석(Ki-Seok An),박종윤(Chong-Yun Park) 한국진공학회(ASCT) 1998 Applied Science and Convergence Technology Vol.7 No.4
Cu가 흡착된 Si(100) 2×1 표면의 원자구조와 전자구조를 연구하기 위해 기판온도와 증착량을 변화시키면서 각 조건에 대해서 LEED 패턴과 수직방향(θ_e=0°) UPS 스펙트럼을 분석했다. UPS 스펙트럼들에는 상온증착했을 때 1.3 ML 이하 증착량에서 실리사이드와 관련된 전자구조가 약하게 나타났고, 증착량을 증가시킴에 따라 Cu 3d 밴드의 세기가 급격히 증가하였다. 실리사이드 형성을 나다내는 전자구조는 상온증착 후 300℃ 이상 열처리 하거나 기판온도 400℃에서 증착했을 때 더욱 뚜렷이 구분되어 관찰 되였다. 이 전자구조들은 실리사이드의 유리 및 탈착온도인 750℃로 열처리 했을 때 사라졌다. 특히, 기판온도 400℃에서 증착하면 낮은 증착량에서는 페르미 준위를 지나는 표면상태 피크가 관측되었다. Rigid band model에 따르면 이 피크는 표면의 비어있는 전자상태(surface empty state)에 Cu의 4s¹ 전자가 체워지면서 생기는 것으로 여겨진다. LEED 패턴 관찰에서는 상온증착 및 상온증착 후 열처리 했을 때 Cu에 의한 초격자상은 관찰되지 않았지만, 기판의 온도를 변화시키면서 증착하였을 때 기판온도에 따라 Cu에 의한 여러가지 초격자상이 관찰되었다. 즉, 400℃에서 1.5 ML 증착하면 청정표면 2×1+2×2, 450℃에서 0.5 ML 증착하면 청정표면 2×1+5×1, 450℃에서 3 ML 증착하면 청정표면 2×1+2×2+5×2+5×5+10×2 등 LEED 패턴을 관찰할 수 있었다. We have investigated the atomic and electronic structures of Cu-adsorbed Si(100)-2×1 surface, by using LEED and UPS. In the UPS spectra, the weak structures (peaks) related to Cu silicide appeared for low coverages less than 1.3 ML at room temperature, and the intensity of Cu 3d band rapidly increased with respect to Cu coverages. The Cu silicide peaks become clear after Cu deposition at room temperature followed by high temperature annealing (≥300℃) or for Cu deposited surface at the substrate temperature of 400℃. On the other hand, these structures disappeared by annealing at 750℃. At very low coverage, a surface state near Fermi level (E_F) was observed at 400℃. According to the rigid band model, it seems to be originated from the surface empty state occupied partially with Cu 4s¹ electron. In the LEED patterns, no Cu-induced superstructure observed for RT-depositions and post annealing, while there were several surface structures which depend on substrate temperatures and coverages. we observed the clean surface 2×1+2×2 phase for 1.5 ML at 400℃, the clean surface 2×1+5×1 phase for 0.5 ML at 450℃ and the clean surface 2×1+2×2+5×2+5×5+10×2 mixed phases for 3 ML at 450℃.
Overlook of current chemical vapor deposition-grown large single-crystal graphene domains
Park, Kyung Tae,Kim, Taehoon,Park, Chong Rae 한국탄소학회 2014 Carbon Letters Vol.15 No.3
Exceptional progress has been made with chemical vapor deposition (CVD) of graphene in the past few years. Not only has good monolayer growth of graphene been achieved, but large-area synthesis of graphene sheets has been successful too. However, the polycrystalline nature of CVD graphene is hampering further progress as graphene property degrades due to presence of grain boundaries. This review will cover factors that affect nucleation of graphene and how other scientists sought to obtain large graphene domains. In addition, the limitation of the current research trend will be touched upon as well.