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2D 확산기를 이용한 전자파 잔향실 내의 필드 분포 특성
양욱,이중근,Yang Wook,Rhee Joong-Geun 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.4
Schroeder 방식의 1 Dimension QRD(quadratic Residue Diffuser)를 사용하여 잔향실 내부에서의 필드 균일성이 향상됨을 밝힌 연구는 이미 수 차례 발표된 바 있다. 본 연구에서는 $2.3\;\cal{GHz}\~3\;\cal{GHz}$대역에서, 전자파 잔향실의 전자기장 특성 및 필드의 균일도 향상을 위해 잔향실 내에 Schroeder 방식의 CRD(Cubical Residue Diffuser)가 설계 및 적용되었고 필드 분포 해석을 위해 FDTD(Finite-Difffrence Time-Domain) 방법의 수치해석이 이루어졌다. 잔향실 내부의 확산기는 cubical residue algorithm과 2D 배열을 사용함으로써 더욱더 random한 형태를 이루었으며 결과적으로 CRD를 사용함으로써 잔향실 내에서의 편파 특성, 표준 편차 및 tolerance 등의 성능이 좋아지는 것을 확인하였다. 또한 2D CRD의 경우, 전력 효율도 높아짐을 알 수 있었다. Papers on improvement of electromagnetic field uniformity in a reverberation chamber with 1D Quadratic Residue Diffuser of Schroeder method has been published several times. In this paper, to obtain improved electromagnetic field characteristics and field uniformity in a reverberation chamber, cubical residue diffuser sets of Schroeder type are designed for a chamber in $2.3\;\cal{GHz}\~3\;\cal{GHz}$. The FDTD(Finite-Difference Time-Domain) technique is used to analyze the field characteristics in a chamber. Cubical residue algorithm and 2D arrangement show more randomness than the previous study results. The characteristics of tolerance, polarity, deviations, as well as power efficency, are improved with cubical residue diffuser sets in a chamber.
광전극 두께와 표면적 변형에 따른 DSSC의 효율 특성
권성열,양욱,주택원,Kwon, Sung-Yeol,Yang, Wook,Zhou, Ze-Yuan 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.2
Photo electrode is an important component for DSSC. DSSCs electrical characteristics and efficiencies fabricated with different $TiO_2$ photo electrodes thickness and modified phoro electrode surface area were studied. $11{\mu}m$ $TiO_2$ photo electrode shows a 4.956% efficiency. The highest short circuit current density was a $9.949mA/cm^2$. Efficiencies and short circuit current density increased as tape casting thickness decreased. Modified surface area of the photo electrode by needle stamp processing were studied. 200 times needle stamp processing on photo electrodes shows a highest 5.168% efficiency. Also the short circuit current density was a $10.261mA/cm^2$.
Pt 상대전극 성막 두께와 두 기판 간격에 따른 DSSC의 효율 특성
권성열,양욱,주택원,Kwon, Sung-Yeol,Yang, Wook,Zhou, Zeyuan 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
DSSCs electrical characteristics and efficiency fabricated with different tape casting thickness Pt counter electrodes and different thickness between $TiO_2$ photo electrode and Pt counter electrode substrate were studied. 1 layer Pt counter electrode shows 3.979% efficiency. Efficiency increased as tape casting thickness decreased. The lowest open-circuit voltage was a 0.726 V and the highest short-circuit current was a 2.188 mA on 1 layer Pt counter electrode. On the different thickness between two substrates, the lowest open-circuit voltage 0.712 V and the highest short-circuit current 2.787 mA was measured at $60{\mu}m$ surlyn film thickness and it shows the highest value of 5.067% efficiency.
TiO<sub>2</sub> Paste에 PEG 첨가에 따른 DSSC의 효율 특성
권성열,양욱,장자항,Kwon, Sung-Yeol,Yang, Wook,Zhang, Zi-Heng 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11
Photo electrode is an important component of DSSC, so this paper did some research on it. Through the method of adding PEG additive into $TiO_2$ paste, the electrical characteristics and efficiencies of DSSCs with photo electrode surface area were studied. In the case of not adding PEG in $TiO_2$ paste, $26{\mu}m$ thickness $TiO_2$ photo electrode shows 5.081% efficiency. The highest short circuit current density was $10.476mA/cm2^$. The structure of porous $TiO_2$ film can be controlled through changing the PEG additive amount in $TiO_2$ paste and the molecular weight of PEG. When the additive amount of PEG 20,000 in $TiO_2$ paste reaches 5%, the peak efficiency with $26{\mu}m$ thickness $TiO_2$ photo electrode was 5.387% and its highest current density were $11.084mA/cm^2$.
TiO<sub>2</sub> 광전극 두께와 두 기판 간격에 따른 DSSC의 효율 특성
박한석,권성열,양욱,Park, Han-Seok,Kwon, Sung-Yeol,Yang, Wook 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
DSSCs efficiency by thickness of $TiO_2$ photoelectrode and thickness differences between two substrates studied. DSSCs is made of the doctor blade method and photoelectrode annealing temperature elevated in a different ways. In addition, cells efficiencies of according to the different thickness between $TiO_2$ photoelectrode substrate and Pt counter electrode was measured. Efficiency of DSSCs made with $TiO_2$ photoelectrode of 18 ${\mu}m$ thickness and the gap difference between the substrate 28 ${\mu}m$ shows a highest 4.805% efficiency.
TTIP가 첨가된 저온소성용 TiO<sub>2</sub> Paste를 이용한 DSSC의 효율 특성
권성열,심창수,양욱,Kwon, Sung Yeol,Sim, Chang Soo,Yang, Wook 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.1
Recently, the application field of solar panels is increasing. Accordingly, the demand for flexible devices is also steadily increasing. It is therefore necessary to develop $TiO_2$ paste for low-temperature annealing for flexible DSSC fabrication. In this study, the $TiO_2$ paste for low-temperature annealing with varying molar ratio of titanium isopropoxide (TTIP) was prepared, and DSSC was fabricated and its characteristics were compared. As a result, there was no deformation of the particles on the surface in the SEM data. However, the highest open circuit voltage, short circuit current, and fill factor were measured in the DSSC unit cell prepared by adding 0.5 mol of TTIP to the $TiO_2$ paste, and the highest efficiency was 4.148%.
와전류 센서를 이용한 비접촉식 진원도 측정에 관한 연구
배종일(Jong-Il Bae),양욱(Wook Yang),심창수(Chang-Soo Sim),배민성(Min-Sung Bae) 대한전기학회 2019 전기학회논문지 Vol.68 No.3
A sensor for constructing an In-line roundness measuring device has a tough characteristic on a foreign matter existing on the surface during grinding processing, selects a non-contact eddy current sensor which is excellent in durability and does not cause surface scratches The objective was set to constitute a device capable of performing In - Line roundness measurement and to make it possible to measure by applying the theory of circularity of three points method. In this study, when three displacement sensor signals of the input values of the 3 point circularity algorithm are composed only of the sample shape and the vibration signal by simulation in consideration of the characteristics of the non-contact eddy current sensor, three displacement sensors Using the output of 3 point method to know the roundness was able to confirm the roundness shape of the input sample analogized to a certain value by the vibration protest canceling by the prism. Also, from the output of the displacement sensor, it can be considered that if the system noise is not included, the shape of the input sample can be completely estimated.