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지대원,한일조 금오공과대학교 2006 論文集 Vol.27 No.-
The purpose of this study was to analyse the expectations of classroom teachers in middle school students, concerning teachers' personality traits, class management, instruction and student guidance. Generally students seem to favor more good than able teachers of kind and generous mind in twenties, who can deal their students with fair treatments, and guide with concrete instructional and disciplinary principles.
다양한 전계인가율과 온도에서 강유전 세라믹의 이력선도 계측과 기준 잔류 분극 및 변형률 거동 예측
지대원,김상주,Ji, Dae Won,Kim, Sang-Joo 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
A poled lead zirconate titanate (PZT) rectangular parallelepiped specimen was subjected to through-thickness electric fields at five loading rates and four temperatures. The rates of the electric field were 0.01, 0.10, 0.25, 0.50, and $1.00MVm^{-1}s^{-1}$; the temperatures were 20, 50, 80, and $110^{\circ}C$. From the measured polarization hysteresis responses, the so-called reference remnant polarization and strains were calculated. Using the calculated reference remnant polarization hysteresis loops, the effects of loading rates and temperature were discussed; using the calculated reference remnant strains, strain butterfly loops were calculated and compared with observations.
상온과 고온에서 압축하중을 받는 PZT에서의 잔류상태변수와 선형재료상수의 변화
지대원,김상주,Ji, Dae Won,Kim, Sang-Joo 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.1
A poled lead zirconate titanate (PZT) cube specimen is subjected to impulse-type compressive stress with increasing magnitude in parallel to the poling direction at four room and high temperatures. During the ferroelastic domain switching induced by the compressive stress, electric displacement in the poling direction and longitudinal and transverse strains are measured. Using the measured responses, linear material properties, namely, the piezoelectric and elastic compliance coefficients, are evaluated by a graphical method, and the effects of stress and temperature are analyzed. Finally, the dependency of the evaluated linear material properties on relative remnant polarization is analyzed and discussed.
필렛효과에 따른 미세혈관 문합커플러(AnaFix<SUP>Ⓡ</SUP>) 마이크로핀의 응력분포
지대원(Dae-Won Jee),김철웅(Cheol-Woong Kim) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.11
기존 봉합사를 이용한 미세혈관수술의 단점을 개선한 기계식 미세혈관 문합시스템은 크게 문합링-핀 시스템 및 디바이스로 구분된다. 유한요소해석을 이용한 본 연구에서 문합링파트는 생체적합성과 사출성형 가공성이 우수한 High Density Polyethylene(HDPE)가 적용되었고, 마이크로핀은 SUS316, Ti-6Al-4Nb, Ti-6Al-4V, unalloyed titanium 이상 4가지 재료가 적용되었다. 미세혈관 문합링 마이크로핀의 fillet radius, neck length가 von Mises stress 변화에 미치는 영향을 평가하기 위해 Short Neck(SN)과 Long Neck(LN)으로 구분하고, 필렛이 존재하지 않는 경우(SN-1, LN-1)와 존재하는 경우(SN-2, SN-3, LN-2, LN-3)로 구분하였다. 필렛 유무와 형상에 대한 von Mises stress의 변화비인 Fillet Radius Rate(FRR)와 동일 필렛형상 내에서 neck 길이변화에 따른 von Mises stress의 변화비인 Neck Length Rate(NLR)의 결과를 종합해본 결과 SN-3의 마이크로핀 neck 형상이 가장 안전한 설계 형상임을 파악할 수 있었다. An automated anastomotic ring-pin system consisting of both the anastomotic ring-pin system and the coupler device has eliminated the drawbacks of the suture method. High density polyethylene (HDPE), a material with outstanding biocompatibility and injection molding capability, was used in the ring. SUS316 stainless steel, Ti-6Al-4Nb, Ti-6Al-4V, and unalloyed titanium were used in FEM simulations of the micropin. The authors categorized the microvascular anastomotic ring micropins into short neck (SN) and long neck (LN) groups in order to evaluate the effect of the micropin's fillet radius and neck length on the von Mises stress. The micropins were further divided into those with and without fillet. On the basis of the fillet radius rate (FRR), which represents the rate of change in the von Mises stress with respect to the availability and shape of the fillet, and the neck length rate (NLR), which represents the rate of change in the von Mises stress with respect to changes in the length of the neck within the fillet shape, it can be concluded that the SN-3 neck design is the most stable.
LED 구강케어기기의 광균일도 향상을 위한 광학 해석에 관한 연구
지대원(Daewon Ji),김주철(Joocheol Kim),이종혁(Jonghyuk Lee),김준영(Junyoung Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
LEDs can freely provide wavelengths and can treat hard-to-reach areas in a narrow space. Most of the recently released oral care devices are whitening devices with only the anterior or pars lateralis, so it is difficult to care for all parts of the oral cavity. In this paper, an oral care device that covers all areas of the oral cavity and has antibacterial, relieve inflammation and prevent inflammation effects is developed to overcome the shortcomings. The trajectory of the maxillary and mandibular arch of an adult male is acquired by TDI(Time Delay Integration) method and the FPCB is designed according to the trajectory. FPCB is designed in four types : maxillary, mandibular, pars medialis, lateralis and a total of three types of LEDs, including 470nm Blue LED, 525nm Green LED and 630nm Red LED are placed on top face of the FPCB. Optical simulation is carried out according to the arrangement of each LED from the minimum resin thickness of 1mm to the maximum of 5mm and an arrangement position with optimized Light Uniformity is selected. This paper suggests a new design approach that selected arrangement position, light distribution of each division is predicted and confirmed through reverse tracing of light wave and then each divided segment is separately designed, Using new design method.
LED 구강케어기기의 광균일도 향상을 위한 광학 해석에 관한 연구
지대원(Daewon Ji),김주철(Joocheol Kim),이종혁(Jonghyuk Lee),김준영(Junyoung Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
LEDs can freely provide wavelengths and can treat hard-to-reach areas in a narrow space. Most of the recently released oral care devices are whitening devices with only the anterior or pars lateralis, so it is difficult to care for all parts of the oral cavity. In this paper, an oral care device that covers all areas of the oral cavity and has antibacterial, relieve inflammation and prevent inflammation effects is developed to overcome the shortcomings. The trajectory of the maxillary and mandibular arch of an adult male is acquired by TDI(Time Delay Integration) method and the FPCB is designed according to the trajectory. FPCB is designed in four types : maxillary, mandibular, pars medialis, lateralis and a total of three types of LEDs, including 470nm Blue LED, 525nm Green LED and 630nm Red LED are placed on top face of the FPCB. Optical simulation is carried out according to the arrangement of each LED from the minimum resin thickness of 1mm to the maximum of 5mm and an arrangement position with optimized Light Uniformity is selected. This paper suggests a new design approach that selected arrangement position, light distribution of each division is predicted and confirmed through reverse tracing of light wave and then each divided segment is separately designed, Using new design method.