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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.
염료감응형 태양전지의 상대전극 Roughness Factor 조절을 통한 셀 특성 연구
손민규(Son, Min-Kyu),서현웅(Seo, Hyun-Woong),이경준(Lee, Kyoung-Jun),김정훈(Kim, Jeong-Hoon),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Dye-sensitized solar cell has many internal resistant components such as Pt counter electrode, TiO₂/dye/electrolyte, charge diffusion, sheet resistance of TCO. Among these, the resistance about the counter electrode can be reduced by increasing the roughness factor of Pt counter electrode. This causes the increase of fill factor and improvement of efficiency. And the amount of light reflection on the counter electrode also increases as the roughness factor goes up. In our experiment, we suggest a new deposition structure of Pt thin film that is a stepped-type structure. The more step lines are in the counter electrode, the more roughness factor is. As a result, we get the improvement of fill factor and efficiency by controlling the roughness factor of counter electrode.
염료감응형 태양전지의 TiO<sub>2</sub> 입자 크기에 따른 광분산 효과 연구
손민규(Son, Min-Kyu),서현웅(Seo, Hyun-Woong),이경준(Lee, Kyoung-Jun),장진주(Jang, Jin-Ju),홍지태(Hong, Ji-Tae),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
One of methods to increase the efficiency of a dye-sensitized solar cell(DSC) is the effective usage of the incident light. It can be controlled by using a light scattering layer. The light scattering effect makes that the optical path length of incident light to DSC increases. And then, the photocurrent and the efficiency is increased because of the increase of dye adsorption and the abundant amount of the light. In this study, we apply the light scattering layer to DSC by using two TiO₂ pastes that have different particle sizes. As a result, the photocurrent increases and the total efficiency is also increases in the case of using large-sized TiO₂ particle as the light scattering layer.
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.
염료감응형 태양전지의 TiO₂ Layer 다분할 효과에 따른 효율 향상 연구
손민규(Son, Min-Kyu),서현웅(Seo, Hyun-Woong),이경준(Lee, Kyoung-Jun),홍지태(Hong, Ji-Tae),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Active area of dye-sensitized solar cell (DSSC) has an effect on the efficiency of DSSC. As the active area increases, the efficiency goes down in a general way. This is caused by the increase of internal resistance in DSSC. The internal resistances are related to various resistant elements. The charge transfer processes at Pt counter electrode and the sheet resistance of TCO are two of these resistant elements. In this study, we try to divide the active area into several small sections in a large sized cell to reduce these two internal resistant elements. As a result, we find out that the fill factor is increased and then the conversion efficiency is improved as the number of dividing active area into several small sections is increased.
상대전극 제작 방식에 따른 염료감응형 태양전지 특성 비교 연구
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),신인영(In-Young Shin),김진경(Jin-Kyoung Kim),홍지태(Ji-Tae Hong),채원용(Won-Yong Chae),김희제(Hee-Je Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Dye-sensitized solar cell (DSC) consists of photo electrode, counter electrode and electrolyte. Photo electrode has titanium oxide layer with dye molecule to create electrons. And counter electrode is made of one layer that has catalytic ability for redox system such as the iodide/triiodide couple. Most DSC researchers use platinum as catalyst on counter electrode because platinum has good catalytic ability and conductivity. Platinum is doped on fluorine-doped tin oxide glass with different methods such as sputtering method, electrochemical method and so on. In this paper, we deposit platinum on counter electrode glass with two methods. One is the radio frequency (RF) sputtering method and the other is the chemical method with heating treatment. Finally, we compare the photovoltaic characteristics of DSCs that are assembled using two different counter electrodes.
금융연구(金融硏究) : 우리나라 재정정책 효과의 비대칭성 분석
손민규 ( Min Kyu Son ),이정욱 ( Jeong Wook Lee ) 한국금융학회 2014 금융연구 Vol.28 No.2
본 연구는 비선형모형인 Threshold VAR를 활용하여 우리나라 재정지출 효과의 비대칭성을 분석하였다. 분석 결과 우리나라의 경우 정부소비를 재정지출 변수로 이용하여 평가한 재정지출확대의 성장효과는 GDP 갭률이 특정 임계치를 상회하는 호경기 보다 임계치를 하회하는 불경기에더 큰 것으로 나타났다. 또한 경기국면별 재정승수의 차이로 환산한 재정정책 효과의 비대칭성의크기도 선행연구에서 도출된 여타 국가의 결과에 비해 작지 않은 것으로 나타났다. 아울러충격부호별로는 경기국면과 관계없이 재정지출 축소 충격이 GDP에 미치는 효과가 동일한 규모의재정지출 확대 충격보다 더 큰 것으로 나타났다. The outbreak of the financial crisis in 2008 and the subsequent global recession have drawn much attention from both academia and policymakers to the role of the discretionary fiscal policy, triggering a huge amount of research efforts to quantify the policy effects. In particular, some of the literatures have recently examined the presence of asymmetries in the fiscal policy effects over the state of the economy. In a similar context, this paper investigates the nonlinear impacts of government spending on output for the first time in Korea using threshold vector autoregression model (TVAR) which allows parameters to switch according to whether a threshold variable crosses an estimated threshold. We begin by constructing the TVAR which includes quarterly data of the real government consumption, real GDP and real interest rate as endogenous variables and GDP gap which is widely perceived to be a measure of slackness in the economy as a threshold variable with the sample period of 1980Q1~2013Q3. With this model, we estimate the threshold of GDP gap which defines two different regimes of the economy and based on this threshold, we conduct the nonlinear impulse response analysis via bootstrapping simulations in order to capture the differing impacts of the government spending shocks by each regime and by the sign of the shocks as well. There are strong empirical evidence in favor of asymmetric effects of the fiscal policy in Korea. To be more specific, we find that the government spending shocks have a larger impact on output during the regime in which GDP gap is below the estimated threshold than during the regime above the threshold. Moreover, the degree of asymmetry which is measured by the difference of the spending multipliers in each regime turns out to be larger in Korea than those of other advanced economies from the previous studies. Our empirical results also show that the negative spending shocks have a larger impact on output than the positive shocks regardless of which regime the economy lies in at the beginning. As a policy implication for Korea, our results imply that the government spending increase can play a pivotal role in boosting the economy especially when it suffers from a severe lack of aggregate demand, much differently from when the output is above its potential level. It should also be noted that a large scale of the government spending cut aimed at enhancing fiscal soundness could have a dampening impact on the economy far larger than anticipated through the conventional linear models. Even though this paper provides robust evidence of the nonlinear growth effects of the government spending in Korea, further researches should be undertaken upon where these nonlinearities originate from, other than the real interest rate which does not show a significant difference in its responses to the shocks over the state of the economy.