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RF-PECVD법에 의해 합성된 a-C : H 박막의 내부응력에 관한 연구
손민규,이상현,김성녕,이재성,고명완,Son, Min-Gyu,Lee, Sang-Hyeon,Kim, Seong-Nyeong,Lee, Jae-Seong,Go, Myeong-Wan 한국재료학회 1998 한국재료학회지 Vol.8 No.3
RF-PECVD로 합성된 a-C : H 박막의 내부압축응력 발생 원인을 규명하기 위하여 mesh에 RF power를 인가하는 새로운 장치를 고안, 기판지지대에 RF power를 인가하는 기존의 장치에서 합성된 시편과의 비교.분석을 수행하였다. Raman 분광 분석과 내부압축응력 측정 결과로부터 mesh 장치에 의해 합성되어진 시편의 $sp^{3}$$sp^{2}$비가 감소함에 따라 내부압축응력이 감소하는 것을 관찰할 수 있었으며, 또한 미세경도와 밀착강도를 측정하였다. 그리고 내부합축응력 발생에 대한 이온충돌효과를 확인하기 위해서 Ar보조가스를 첨가하였다. 그 결과 입자의 peening 효과에 의한 내부압축응력의 발생을 확인할 수 있었다.
인플레이션 불확실성의 기업 설비투자에 대한 비대칭적 효과 분석
손민규,장영재,Son, Minkyu,Chang, Youngjae 한국통계학회 2014 응용통계연구 Vol.27 No.1
인플레이션의 불확실성은 기업투자의 기회비용 산정 등에 어려움을 줌으로써 설비투자를 위축시킬 수 있다. 본 연구에서는 우리나라에서도 이러한 가설의 성립여부를 검정하고자 시변모수(Time-Varying) GARCH모형과 품목별 상대가격 변동성을 통해 인플레이션과 관련된 불확실성을 측정하고 동 불확실성이 기업의 설비투자에 미치는 영향을 살펴보았다. 인플레이션 불확실성을 인플레이션율의 불확실성과 품목별 상대가격 변동성으로 각각 산출하여 추이를 살펴보면 우리나라의 인플레이션율이 구조적으로 낮아진 2000년대 이후에도 인플레이션 관련 변동성이 등락을 거듭하는 모습으로 보이고 있다. 또한, 동 지표들을 활용하여 설비투자와의 관계를 점검한 결과 인플레이션 불확실성은 예상한 바와 같이 기업의 설비투자에 유의한 부(-)의 영향을 미치는 것으로 나타났다. 특히 이러한 인플레이션 불확실성의 비대칭적 효과를 살펴보기 위해 마코프 국면전환 회귀모형(Markov-Switching Regression Model)을 추정한 결과, 인플레이션 불확실성의 투자위축 효과가 경기위축기에 더욱 커지는 것으로 나타났다. Inflation uncertainty is known to have deleterious effects on facilities investment by disturbing the corporate decision on the opportunity cost of investment. In this paper, we test the validity of this hypothesis in Korea by estimating the inflation uncertainty with both a time-varing parameter model with GARCH disturbances and the relative price volatility and then, estimate the facilities investment equation which includes those uncertainty indicators. The uncertainty indexes estimated by the above-mentioned methods continue to fluctuate even after the inflation rate has dropped dramatically reflecting the structural changes of Korea's economy since the financial crisis in 1997. As a result of estimation of the investment equation by both OLS and GMM, we find the inflation uncertainty has a negative effect on facilities investment with a statistical significance. Moreover, by means of Markov-switching regression model utilized to verify the non-linearity of this relationship, we draw a conclusion that this negative effect of inflation uncertainty heightens asymmetrically during the downturn periods of business cycle.
손민규(Son min-kyu),임성근(Im sung goun),박두만(Park Doo-man) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
A Vigilance control is a device fitted in the driving cab of a railway train to ensure that the driver is alert on the job. A simple vigilance control requires that the driver press a button at intervals not less than a certain amount and not more than another amount of time. If the driver fails to operate the vigilance control within those limits, a hooter sounds, and should the driver still doesn"t operate the vigilance control then the brakes are applied. If the driver falls asleep or takes ill, then clearly such a vigilance control will sooner or later apply the brakes. The this vigilance control system which is applied to reduce the drive load at Syria diesel multiple unit train is proposed.
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),김수경(Soo-Kyoung Kim),홍나영(Na-Yeong Hong),김병만(Byung-Man Kim),박송이(Songyi Park),김희제(Hee-Je Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.11
In this study, the ZnO nanorod is grown on the seed layered glass substrate by applying an external electric field to fabricate the ZnO nanorod with the high quality and to increase the yield of the ZnO nanorod. It is possible to grow the definite and clear hexagonal ZnO nanorod as the cathode of the high voltage is connected to the side of the seed layered glass substrate and the anode is connected to the opposite side because more Zn<SUP>2+</SUP> ions are located around the ZnO seed layer and are accumulated easily due to the external electric field. As a result, it is succeeded to fabricate the definite hexagonal ZnO nanorod having better structural characteristics by applying the external electric field during the growth process. Therefore, it is demonstrated that the external electric field is effective to fabricate the high quality ZnO nanorod without changing any composition of the ZnO nanorod.
손민규(Son, Min-Gyu),원호성(Won, Ho-Sung) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.1
The purpose of this study was to analyze the housing mobility behavior according to the income change and to predict the probability of upward and downward movements. A binary logit model was used with the data which were obtained by the Korea Research Institute for Human Settlements in 1989. The sample size was 1620 households in Seoul. The results of this study were as follows; the upward movement probability in rental housing or in single housing was higher than that in owned housing or in apartment housing as household income increased.
파이버 레이저 투명 전극 식각을 통한 염료감응형 태양전지 효율 상승 연구
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),신인영(Inyoung Shin),김진경(Jin-Kyoung Kim),최진호(Jinho Choi),최석원(Seok-Won Choi),김희제(Hee-Je Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
Dye-sensitized solar cell (DSC) is a promising alternative solar cell to the conventional silicon solar cell due to several advantages. Development of large scale module is necessary to commercialize the DSC in the near future. A scribing technology of the transparent conductive oxide (TCO) is one of the important technologies on the fabrication of DSC module. A quality of the scribed line on the TCO has a decisive effect on the efficiency of DSC module. Among several scribing technologies, the fiber laser is a suitable for scribing the TCO more precisely and accurately because of their own characteristics. In this study, we try to improve the quality of the TCO scribed line by using the fiber laser. Consequently, the operating parameter of fiber laser is optimized to get the TCO scribed line with good quality. And the fiber laser scribing technology of the TCO is applied to the fabrication of the DSC with optimal operating parameter, operating current 3900㎃. As a result, the current density and fill factor are improved and the total efficiency is increased because the internal resistances of DSC such as TCO sheet resistance and the resistance concerned to the electron movement in the TiO2 are reduced. This is analyzed by the electrochemistry impedance spectroscopy (EIS) and the equivalent circuit model of the DSC.