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유아의 사회적 행동 발달과 부모의 공동체 의식과의 관계 연구
김현신(Hyun Sin Kim),우남희(Nam Hee Woo) 한국아동학회 2000 아동학회지 Vol.21 No.1
The influence of parental perspectives about community life on children`s social behavior was studied with dyads of 140 children 3-6 years of age. The children`s teachers rated children`s behavior on rule-keeping and responsible behavior. Teacher ratings were compared with the 6 sub-factors of parents` perspectives on community life. Father`s overall perspectives about community life was correlated with child`s responsible behavior but not with rule-keeping behavior. However, father`s autonomy and attitude towards community life was correlated to both behaviors. Age and gender differences in children`s rule-keeping and responsible behaviors showed that these behaviors increased with age and girls showed more frequent rule-keeping and responsible behaviors than boys.
이정민(Jeong-min Lee),김진형(Jin-hyoung Kim),곽우경(Woo-gyeong Kwak),강민성(Min-sung Kang),김현신(Hyun-sin Kim),김윤제(Youn-Jea Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Mass flow amplifier, which is an aerodynamic device, utilizes the Coandă effect. In this study, design optimization of mass flow amplifier was conducted by using three-dimensional Navier-Stokes analysis and the response surface method (RSM) with various configurations of Coandă nozzle. A numerical analysis was performed using the commercial code, ANSYS CFX with the shear stress transport (SST) turbulent model. Each of design parameters was sorted into three levels. Design parameters, which have 15 design points respectively, were planned using central composite design (CCD) method. Response surfaces, which were based on the results of DOE, were used to determine the optimal shape of Coandă nozzle. Through the optimization, aerodynamic performance of mass flow amplifier was improved.
유입구 형상 변화가 질량유량 증폭기 성능에 미치는 영향
이정민(Jeong-min Lee),김재원(Jae-Won Kim),윤석문(Seok-Mun Yoon),김현신(Hyun-sin Kim),김윤제(Youn-Jea Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In order to improve the performance of mass flow amplifier, the flow characteristics of Coanda nozzle were studied with various operating conditions. In particular, the effects of the numbers of compressed air inlet and two different shapes of compressed air inlet (spiral and non-spiral) were considered as design parameters. In addition, four different pressure conditions of compressed air (Pc = 0.1, 0.2, 0.3, and 0.4 MPa) were also considered to investigate the flow characteristics of mass flow amplifier. Numerical analyses were conducted by using the commercial code, ANSYS CFX 14.5 with the shear stress transport (SST) turbulent model. The results for pressure and velocity vector distributions and flow rates were graphically depicted.
AgAl 전극 고온 소성 조건 가변에 따른 N-형 결정질 실리콘 태양전지의 접촉 특성 분석
오동현,정성윤,전민한,강지윤,심경배,박철민,김현후,이준신,Oh, Dong-Hyun,Chung, Sung-Youn,Jeon, Min-Han,Kang, Ji-Woon,Shim, Gyeong-Bae,Park, Cheol-Min,Kim, Hyun-Hoo,Yi, Jun-Sin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8
n-type silicon shows the better tolerance towards metal impurities with a higher minority carrier lifetime compared to p-type silicon substrate. Due to better lifetime stability as compared to p-type during illumination made the photovoltaic community to switch toward n-type wafers for high efficiency silicon solar cells. We fabricated the front electrode of the n-type solar cell with AgAl paste. The electrodes characteristics of the AgAl paste depend on the contact junction depth that is closely related to the firing temperature. Metal contact depth with p+ emitter, with optimized depth is important as it influence the resistance. In this study, we optimize the firing condition for the effective formation of the metal depth by varying the firing condition. The firing was carried out at temperatures below $670^{\circ}C$ with low contact depth and high contact resistance. It was noted that the contact resistance was reduced with the increase of firing temperature. The contact resistance of $5.99m{\Omega}cm^2$ was shown for the optimum firing temperature of $865^{\circ}C$. Over $900^{\circ}C$, contact junction is bonded to the Si through the emitter, resulting the contact resistance to shunt. we obtained photovoltaic parameter such as fill factor of 76.68%, short-circuit current of $40.2mA/cm^2$, open-circuit voltage of 620 mV and convert efficiency of 19.11%.