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정민지,김천휘,Jeong, Min-Ji,Kim, Cheon-Hwi 한국천문학회 2012 天文學會報 Vol.37 No.2
Hoffmeister(1943)에 의해 변광성으로 발견된 V345 Cas (2MASS J23083986+5406545, ${\alpha}$(2000.0)=23h08m39.86s & ${\delta}(2000.0)=+54^{\circ}06^{\prime}54.6^{\prime\prime}$)는 B 필터에서 13.1~14.2의 광도 변화를 보이는 것으로 알려진 별이다. 우리는 레몬산 천문대(LOAO)에서 2007년과 2008년에 걸쳐 총 22일간 V345 Cas의 BVRI CCD 측광관측을 수행하여, 처음으로 V345 Cas의 년도 별 전체 광도곡선을 완성하였다. 우리의 관측 자료와 Super WASP에서 공개한 자료를 이용하여 각각 7개의 극심시각을 산출하였다. 우리가 결정한 극심시각을 포함하여 여러 문헌에서 수집한 총 68개의 극심시각을 이용하여 V345 Cas의 주기 분석을 수행하였다. 그 결과, V345 Cas의 궤도주기는 포물선 모양의 영년변화와 함께 약 30년의 규칙적인 변화를 겪고 있음을 발견하였다. 규칙적인 변화를 제3천체에 의한 광시간 효과로 가정하여 관측된 극심시각에 잘 맞는 광시간 궤도 해를 산출한 결과, 영년주기가 증가하는 경우와 감소하는 경우에 대해, 각각 29.0년과 39.7년 주기를 갖는 두 개의 광시간 궤도 해가 가능하다. 이러한 모호성을 해결하기 위해서 앞으로의 극심시각 관측이 중요하다. 2007년과 2008년 BVRI 광도곡선들은 부극심을 기준으로 좌우가 거의 대칭이며, 1년 사이에 특기할 만한 광도변화를 보이지 않았다. 우리는 이 광도곡선들을 Wilson-Devinney 쌍성 모델을 이용하여 분석하여, V345 Cas의 측광학적 해를 처음으로 산출하였다. 우리가 구한 해에 의하면, 약 88도의 궤도경사각에 두 성분별의 질량비가 약 0.5인 V345 Cas는 질량과 표면 온도가 큰 주성과 로쉬 로브를 채우고 있는 반성으로 구성된 준 분리형 식쌍성계이다.
원자층 증착법으로 증착된 MoO<sub>x</sub>를 적용한 전하 선택 접합의 이종 접합 태양전지
정민지,조영준,이선화,이준신,임경진,서정호,장효식,Jeong, Min Ji,Jo, Young Joon,Lee, Sun Hwa,Lee, Joon Shin,Im, Kyung Jin,Seo, Jeong Ho,Chang, Hyo Sik 한국재료학회 2019 한국재료학회지 Vol.29 No.5
Hole carrier selective MoOx film is obtained by atomic layer deposition(ALD) using molybdenum hexacarbonyl[$Mo(CO)_6$] as precursor and ozone($O_3$) oxidant. The growth rate is about 0.036 nm/cycle at 200 g/Nm of ozone concentration and the thickness of interfacial oxide is about 2 nm. The measured band gap and work function of the MoOx film grown by ALD are 3.25 eV and 8 eV, respectively. X-ray photoelectron spectroscopy(XPS) result shows that the $Mo^{6+}$ state is dominant in the MoOx thin film. In the case of ALD-MoOx grown on Si wafer, the ozone concentration does not affect the passivation performance in the as-deposited state. But, the implied open-circuit voltage increases from $576^{\circ}C$ to $620^{\circ}C$ at 250 g/Nm after post-deposition annealing at $350^{\circ}C$ in a forming gas ambient. Instead of using a p-type amorphous silicon layer, high work function MoOx films as hole selective contact are applied for heterojunction silicon solar cells and the best efficiency yet recorded (21 %) is obtained.
정민지,Seung Yeon Baik,Yourim Kim,Sungkean Kim,Dongil Min,Jeong-Youn Kim,Seunghee Won,이승환 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.3
Objective: While impaired facial expression recognition has been closely associated with reduced temporal lobe volume in patients with schizophrenia, this study aimed at examining whether empathy and social attribution affect such a relationship. Methods: A total of 43 patients with schizophrenia and 43 healthy controls underwent a facial expression recognition task (FERT) and magnetic resonance imaging. Basic empathy scale and the social attribution task-multiple choice were used to measure empathy and social attribution. Results: Patients with schizophrenia showed significant positive correlations between the total temporal lobe volume and the FERT-accuracy (FERT-ACC). Diminished temporal lobe volume predicted the impaired facial emotion recognition ability. Both empathy and social attribution played roles as moderators of the path from the left amygdala volume, left fusiform gyrus volume, both sides of the superior temporal gyrus volume, and left middle temporal gyrus volume to the FERT-ACC. In contrast, empathy alone functioned as a moderator between the right fusiform gyrus volume, right middle temporal gyrus volume, and FERT-ACC. No significant interaction was found for healthy controls. Conclusion: Our results suggest that social cognition remediation training on empathy and social attribution, could buffer the negative effects of small temporal lobe volume on interpersonal emotional communication in patients with schizophrenia.
정민지(MinJi Jeong),김진용(Jinyong Kim),정창현(Changhyun Jeong),이영석(Youngseok Lee),정도현(Dohyun Jung) 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
The most people have some representative prejudices when they are facing women drivers while driving. They tend to associate with female drivers as interrupters who impede the flow of the road. For example, the people who drive too slowly alone, drivers who have frequent sudden stop and a quick start and inexperienced people with changing lanes. In this paper, we have studied deceleration characteristics which is one of drivers' traits according to drivers' gender when they driving on the highway for investigating the truth. For experiments, we recruited twenty men and twenty women patients who are 30~40 years old. Highway is selected as a test course to reduce to a minimum impact from environment Brake Act signals that is transported from vehicles are used to analyze and same a highway and a vehicle are used at the same time. About 20 minutes before starting the test have been adapted to the drivers to get used a test vehicle. Through the result of this study, we would like to identify male and female drivers' deceleration characteristics and reconsider preconceptions about women drives that most people have.
정민지(Minji Jeong),김진용(Jinyong Kim),정창현(Changhyun Jeong),이영석(Youngseok Lee),정도현(Dohyun Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper is research about proactive safety and we have measured driver"s real time position of eye and head by using a camera settled in front of operator (driver) and a eye tracker equipment. Collected data were used to analyze a correlation between driver’s career and gender and its effect on driver’s behavior. Moreover, By calculating standard deviation figure (σ) of driver’s head behavior studied to represent how stable behavior depend on features driver has. This study results will be used to concrete an accident preventative education and be utilized as basic material for design system such as each different warning process following driver’s feature.
정민지(Min-Ji Jeong),황재혁(Jai-Hyuk Hwang),배재성(Jae-Sung Bae),권준용(Jun-Yong Kwon) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.11
본 연구에서는 압전유압펌프의 챔버부, 체크밸브, 부하, 펌프구동제어기 등 유압펌프 전체 구성품의 해석 모델링을 통하여 브레이크용 소형 압전유압펌프의 가압 동특성을 해석하였다. 가압 동특성을 해석하기 위해 먼저 적층형 압전작동기가 챔버내에서 압력을 형성하는 과정을 모델링하였다. 체크밸브 개도에 따른 유량계수 식을 얻기 위해, 유한요소코드 해석을 통해 체크밸브 압력분포 및 유동결과를 얻은 후 체크밸브 유량계수식을 커브 피팅으로 유도하였다. 또한 부하압력을 피드백 받아 작동기 입력전압을 제어하여 부하압력이 입력명령 압력을 잘 추종하도록 펌프구동제어기를 설계하였다. 시뮬레이션 결과 브레이크 작동에 필요한 정상작동압력까지 도달하는데 걸리는 시간은 약 0.03ms 정도이다. 본 연구에서 얻어진 해석 시뮬레이션 결과는 실제 실험결과와 비교를 통해 타당성을 검증하였다. In this study, the pressurization characteristics of the small piezoelectric hydraulic pump for a brake system has been analyzed through modeling the full hydraulic pump components; the pump chamber, check valve, pump load, pump drive controller etc. To analyze the pressurization characteristics, the process of charging pressure in the chamber with stacked-layer piezoelectric actuator were firstly modeled. Secondly, the flow coefficient of the check valve in terms of valve opening has been calculated after computational fluid dynamics analysis, such as the pressure distribution around check valve and the flow rate, was conducted. Also the pump driving controller, which controls the input voltage to the actuator, was designed to make the load pressure follow the input pressure command. The simulation results find that it takes about 0.03ms to reach the operating load pressure required for the braking system. The simulation result was also verified through comparison to the result of the pump performance test.