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신성범(Seongbeom Shin),이현화(Hyun Hwa Lee),김종수(Jong Su Kim),이호철(Ho Cheol Lee),양민양(Min Yang Yang) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper presents the thermal characteristic of the tilting motor of two-axis head. Using a FEM, we obtained the tilting motor's maximum temperature change caused by the working load of the motor and effect of spindle built-in motor. Furthermore, the maximum deformation caused by the thermal effect was calculated by FEM tool.
열처리된 그래핀 산화물을 정공주입층으로 이용한 유기발광 다이오드
신성범(Seongbeom Shin) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.4
This paper reports on thermally adjusted graphene oxide (GO) as the hole transport layer (HTL) for organic light-emitting diodes (OLEDs). GO is generally not suitable for HTL of OLEDs because of intrinsic specific resistance. In this paper, the specific resistance of GO is adjusted by the thermal annealing process. The optimum specific resistance of HTL is found to be 102 Ω·m, and is defined by the maximum current efficiency of OLEDs, 2 cd/A. In addition, the reasons for specific resistance change are identified by x-ray photoelectron spectroscopy (XPS). First, the XPS results show that several functional groups of GO were detached by thermal energy, and the amount of epoxide changed substantially following the temperature. Second, the full width at half maximum (FWHM) of the C-C bond decreased during the process. That means the crystallinity of the graphene improved, which is the scientific basis for the change in specific resistance.
신성범(Seongbeom Shin),이현화(Hyun Hwa Lee),김종수(JiS. Kim),김지용(Ji Yong Kim),양민양(Min Yang Yang) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.3
This paper presents the chatter stability lobes of high speed spindle of five-axis machine tools. Using a FEM, we obtained the frequency response function of a spindle and the stability lobes for evaluation of chatter. In addition, this paper suggest FRF using by FEM for the prediction of chatter stable region and critical cutting depth. Therefore, critical cutting depth of is 1.3586mm and X,Y direction’s chatter frequency is 901Hz and 900Hz, respectively.
신규 건설 ADD 천음속풍동 소개 및 AGARD 표준모형 공력계수 비교
서경원(Kyugnwon Seo),이종건(Jong Geon Lee),신성범(Seongbeom Shin),한상현(Sang Hyun Han),박금용(Keum Yong Park),김영준(Young Jun Kim),김남균(Namgyun Kim),진현(Hyeon Jin) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.2
본 논문에서는 국방과학연구소에서 신규 건설한 천음속풍동을 소개하고 성능에 대하여 기술하였다. 천음속풍동은 인젝터구동(Injection Driven), 폐회로(Closed Circuit) 방식의 풍동으로 시험부 크기가 가로, 세로 각각 1.5m이다. 마하수는 0.3에서 1.2까지 연속적으로 변화가능하며, 노즐을 교체하여 마하수 1.4 실험이 가능하다. 풍동의 전압력(Total Pressure)을 100kPa에서 550kPa까지 변화시킬 수 있으며, 그에 따라 레이놀즈수(Reynolds Number)를 크게 변화시켜 실험을 수행할 수 있다. 풍동의 성능을 검증하기 위하여 AGARD-B 표준모형을 이용하여 6분력 공력계수 측정 실험을 수행하였으며, 그 결과를 국과연 삼중음속풍동 및 세계 여러 풍동의 실험결과와 비교 분석하였다. A high Reynolds number transonic wind tunnel has been built in 2018 at Agency for Defense Development(ADD). The tunnel has a closed circuit with a 1.5m×1.5m test section and is injection driven from a 140bar air supply system. The Mach number range is 0.3–1.2 with a conventional contracting nozzle and 1.4 with a convergent-divergent contraction. The stagnation pressure range is 100-550kPa at the lowest Mach number. An AGARD-B standard model is tested in the transonic wind tunnel to obtain 6-DOF aerodynamic coefficients. The results are compared with those obtained from ADD trisonic wind tunnel and others. We verify that the transonic wind tunnel become available to develop an aircraft from the testing results.