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Development of the Organic Solar Cell Technology using Printed Electronics
김정수(Kim, Jungsu),유종수(Yu, Jongsu),윤성만(Yoon, Sungman),조정대(Jo, Jeongdai),김동수(Kim, Dongsoo) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
PEMS (printed electro-mechanical system) is fabricated by means of various printing technologies. Passive and active compo-nents in 2D or 3D such as conducting lines, resistors, capacitors, inductors and TFT(Thin Film Transistor), which are printed withfunctional materials, can be classified in this category. And the issue of PEMS is applied to a R2R process in the manu-facturing process. In many electro-devices, the vacuum process is used as the manufacturing process. However, the vacuum process has a problem, it is difficult to apply to a continuous process such as a R2R(roll to roll) printing process. In this paper, we propose an ESD (electro static deposition) printing process has been used to apply an organic solar cell of thin film forming. ESD is a method of liquid atomization by electrical forces, an electrostatic atomizer sprays micro-drops from the solution injected into the capillary with electrostatic force generated by electric potential of about several tens kV. ESD method is usable in the thin film coating process of organic materials and continuous process as a R2R manufacturing process. Therefore, we experiment the thin films forming of PEDOT:PSS layer and active layer which consist of the P3HT:PCBM. The organic solar cell based on a P3HT/PCBM active layer and a PEDOT:PSS electron blocking layer prepared from ESD method shows solar-to-electrical conversion efficiency of 1.42% at AM 1.5G 1sun light illumination, while 1.86% efficiency is observed when the ESD deposition of P3HT/PCBM is performed on a spin-coated PEDOT:PSS layer.
김정수 ( Kim Jungsu ),편도훈 ( Pyun Dohoon ),안상기 ( Ahn Sangki ),이상욱 ( Lee Sangwook ) 한국금융정보학회 2016 금융정보연구 Vol.5 No.2
본 연구는 수학의 그래프 이론(graph theory)을 이용하여 금융시스템을 하나의 금융기관 간 네트워크로 모델링하여 금융 시스템리스크를 분석하는 방법론을 제안하였다. 먼저 네트워크 관련 선행 연구에 흔히 등장하는 전형적인 네트워크 구조(topology)에 동 방법론을 적용하여 국내은행 네트워크들에서 발생할 수 있는 시스템리스크 특성들을 기여도 및 민감도 측면에서 살펴보았다. 또한 그러한 네트워크 구조의 변화가 유발할 수 있는 시스템리스크의 변동을 추정하는 모의실험을 통해 리스크 관리에 있어 특히 유의해야할 부문을 사전에 발견하는 방법에 대해서도 제안하였다. 모의실험에 추가한 실증분석으로는 금융 부문 간 네트워크추정과 리스크를 실증적으로 분석하였다. 본 연구는 금융 네트워크 구조에서 금융기관 간 연결 및 상호작용과 관련된 금융시스템 리스크의 변화 가능성을 정량적으로 제시하였다. 또한 금융기관의 상호작용을 나타내는 네트워크상 연결 수와 시스템리스크 지수사이에는 어느 정도 비례관계가 존재하나, 그것이 네트워크의 형태 및 세부 연계구조에 따라 항상 성립하지는 않는다는 사실도 함께 확인하였다. 또한 금융 네트워크에서 연결이 추가될 때마다, 즉 금융기관 간 상호거래가 증가할 때마다 시스템리스크는 높아지지만, 그 강도와 여타 부문으로의 파급 효과는 해당 금융기관이 네트워크에서의 위치나 상호작용 양상에 따라 다르다는 것을 보여 주었다. This paper proposes a methodology to analyze systemic risk of a financial system by constructing a network of financial institutions based on the graph theory. To this end, the systemic risk measure is defined using the network and a risk measure of each financial institution. Then, the systemic risk measure is computed for several typical topology which Korean financial market can look like. This research verifies the conjecture quantitatively that if risk is increased in financial institutions with much interactions, it leads to high systemic risk measure. Besides, this research also shows that although the systemic risk measure is proportional to the number of interconnections in the network to some extent, it is not necessarily guaranteed always depending on details of the interactions. In addition, it is shown that whenever the interaction is added to the network, in other words, whenever a transaction is increased, even though the systemic risk is also increased, its strength and effects on the network can be diverse depending on the location and the details of the interactions of the corresponding institution in the network.
Fabrication Method of OPV using ESD Spray Coating
김정수(Kim, Jungsu),조정대(Jo, Jeongdai),김동수(Kim, Dongsoo) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
PEMS (printed electro-mechanical system) is fabricated by means of various printing technologies. Passive and active components in 2D or 3D such as conducting lines, resistors, capacitors, inductors and TFT, which are printed with functional materials, can be classified in this category. And the issue of PEMS is applied to a R2R process in the manufacturing process. In many electro-devices, the vacuum process is used as the manufacturing process. However, the vacuum process has a problem: it is difficult to apply toa continuous process as a R2R printing process. In this paper, we propose an ESD (electro static deposition) printing process has been used to apply an organic solar cell of thin film forming. ESD is a method of liquid atomization by electrical forces, anelectrostatic atomizer sprays micro-drops from the solution injected into the capillary, with electrostatic force generated by electric potential of about tens of kV. ESD method is usable in the thin film coating process of organic materials and continuous process as a R2R manufacturing process. Therefore, we experiment the thin films forming of PEDOT:PSS layer and Active layer which consist of the P3HT:PCBM. The result of experiment, organic solar cell using ESD thin film coated method is occurred efficiency of about 1.4%. Also, the case of only used to ESD method in the active layer coating is occurred efficiency of about 1.86% as the applying a spin coating in the PEDOT:PSS layer. We can expect that ESD method is possible for continuous process to manufacture in the organic solar cell or OLED device.
골반부 방사선치료 시 자체 제작한 Vac-lock type belly board에 대한 유용성 평가
김영연,방승재,정일선,김정수,김영곤,Kim, YoungYeun,Bang, Seungjae,Jung, Ilsun,Kim, Jungsu,Kim, YoungKon 대한방사선치료학회 2014 대한방사선치료학회지 Vol.26 No.1
목 적 : Belly board를 사용한 골반부 치료 시 엎드린 자세로 인해 set-up의 재현성이 다른 치료부위에 비해 떨어진다. 이에 본 연구에서는 기존의 belly board만 사용 시 발생했던 단점들을 보완하기 위해 VLT belly board(Vac-lock type belly board)를 자체 제작하여 그 유용성을 검증하고 set-up의 재현성을 높이고자 한다. 대상 및 방법 : 기존의 belly board를 사용하여 치료한 환자의 OBI 영상과 자체 제작한 VLT belly board를 사용하여 치료한 환자의 OBI 영상을 비교하였다. OBI는 전체 치료과정 중 3번을 시행하였는데, AP 방향, LAT 방향에서 각각 실시하였다. 2차원정합을 이용하여 X축 좌 우방향, Y축 상 하방향, Z축 전 후방향에서 발생하는 set-up에 대한 오차를 측정하여 비교 분석하였다. 결 과 : 영상 2차원 정합을 이용한 set-up의 평균 오차는 X축 방향으로는 0.32 cm에서 0.12 cm으로, Y축 방향으로는 0.41 cm에서 0.19 cm으로, Z축 방향으로는 0.29 cm에서 0.17 cm으로 VLT belly board 사용한 결과의 평균 오차가 감소하였다. 또한 VLT belly board 사용 시 0~0.29 cm의 오차가 48%에서 83%로 증가되고 0.5 cm 이상의 오차가 21%에서 2%로 감소를 보였다. 결 론 : VLT belly board 사용은 기존의 belly board 사용에 대한 효과를 유지하면서 환자 개인의 특성에 맞는 Vac-lock 제작을 통하여 set-up의 오차를 줄여줄 수 있음을 확인했다. 따라서 엎드린 자세로 골반부 치료 시 VLT belly board는 매우 유용할 것이라고 사료된다. Purpose : At the time of the pelvis cancer radiation treatment using the belly board, set-up error is large because of a prone position. In order to improve the reproducibility, we made Vac-lock type belly board. In this study, we attempt to validate its utility. Materials and Methods : We compared belly board and Vac-lock type belly board through the OBI. OBI was performed three times with entire course of treatment and the setup errors in the direction of X axis, Y axis, Z axis were recorded and calculated the distance from the isocenter. Results : X axis, Y axis, Z axis setup errors with existing belly board were 0.32 cm, 0.41 cm, 0.29 cm. The setup errors with the vac-lock type belly board were 0.12 cm, 0.19 cm, 0.17 cm. Further, errors of 0~0.29 cm were increased from 48% to 83% when using VLT belly board. Error of 0.5 cm or more was reduced from 21% to 2%. Conclusion : Vac-lock type belly board is able to maintain the efficacy of existing and create to match the characteristics of the patient. Therefore We think that vac-lock type belly board is very useful in pelvic cancer patients.
유종수(Yu, Jongsu),김정수(Kim, Jungsu),윤성만(Yoon, Sungman),김동수(Kim, Dongsoo),김도진(Kim, Dojin),조정대(Jo, Jeongdai) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Materials with a combination of high electrical conductivity and optical transparency are important components of many electronic and optoelectronic devices such as liquid crystal displays, solar cells, and light emitting diodes. In this study, to fabricate a low-resistance and high optical transparent electrode film for organic photovoltaic, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of thermal roll imprinted (TRI) poly-carbonate (PC) patterned films, the manufacture of high-conductivity and low-resistance Ag paste which was filled into patterned PC film using a doctor blade process and then coated with a thin film layer of conductive polymer by a spin coating process. As a result of these imprinting processes the PC films obtained a line width of 10{pm}0.5{mu}m, a channel length of 500{pm}2{mu}m, and a pattern depth of 7.34{pm}0.5{mu}m. After the Ag paste was used to fill part of the patterned film with conductive polymer coating, the following parameters were obtained: a sheet resistance of 9.65{Omega}/sq, optical transparency values were 83.69 % at a wavelength of 550 nm.