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Kwon, Soon Jin,Song, Hoon Sub,Im, Hyo Been,Nam, Jung Eun,Kang, Jin Kyu,Hwang, Taek Sung,Yi, Kwang Bok The Korean Society of Clean Technology 2014 청정기술 Vol.20 No.3
나노다공성 $TiO_2$ 필름은 주로 염료감응형 태양전지의 작동전극으로 사용된다. 지금까지 염료감응형 태양전지의 광전환효율을 높이기 위해 $TiO_2$ 나노구조체에 대한 다양한 연구가 시도되어왔다. 본 연구에서는 수열합성법을 이용하여 FTO glass 위에 루타일 $TiO_2$ 나노로드를 수직적으로 성장시켰고 그 위에 아나타제 $TiO_2$ 필름을 재 합성하였다. 이 새로운 방법은 아나타제 $TiO_2$ 합성시 요구되는 시드층 합성단계를 피할 수 있었다. 밀집한 아나타제 $TiO_2$ 층은 전자생성층으로써 고안되었고 시드층 대신 합성된 루타일 $TiO_2$ 나노로드는 생성된 전자들이 FTO glass로 이동하는 통로역할을 하게 되었다. 전자이동률을 증진시키기 위해 루타일 나노로드에 $TiCl_4$ 수용액을 이용하여 표면 처리하였고 열처리 후 표면 위에 얇은 아나타제 $TiO_2$ 필름을 형성시켰다. 합성된 루타일-아나타제 $TiO_2$ 구조체의 두께는 $4.5-5.0{\mu}m$이고 셀 테스트 결과 3.94%의 광전환효율을 얻게 되었다. 이는 루타일 $TiO_2$ 나노로드 전극과 비교했을 때 광전환효율이 상당히 향상되는 것을 확인할 수 있었다. Nanoporous $TiO_2$ films are commonly used as working electrodes in dye-sensitized solar cells (DSSCs). So far, there have been attempts to synthesize films with various $TiO_2$ nanostructures to increase the power-conversion efficiency. In this work, vertically aligned rutile $TiO_2$ nanorods were grown on fluorinated tin oxide (FTO) glass by hydrothermal synthesis, followed by deposition of an anatase $TiO_2$ film. This new method of anatase $TiO_2$ growth avoided the use of a seed layer that is usually required in hydrothermal synthesis of $TiO_2$ electrodes. The dense anatase $TiO_2$ layer was designed to behave as the electron-generating layer, while the less dense rutile nanorods acted as electron-transfer pathwaysto the FTO glass. In order to facilitate the electron transfer, the rutile phase nanorods were treated with a $TiCl_4$ solution so that the nanorods were coated with the anatase $TiO_2$ film after heat treatment. Compared to the electrode consisting of only rutile $TiO_2$, the power-conversion efficiency of the rutile-anatase hybrid $TiO_2$ electrode was found to be much higher. The total thickness of the rutile-anatase hybrid $TiO_2$ structures were around $4.5-5.0{\mu}m$, and the highest power efficiency of the cell assembled with the structured $TiO_2$ electrode was around 3.94%.
Modular Analog CMOS VLSI Chips for Multilayered Neural Networks with On-Chip BEP Learning
Wang, Yi Wen,Kwon, Taek Mu,Khatib, Omar 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
A modular design approach for analog CMOS implementations of a feedforward neural net with on-chip Backward Error Propagation (BEP) learning is proposed. Two prototype chips have been designed and sent for fabrication in 2.2 × 2.2 ㎟ using a standard 2㎛ CMOS technology. A 3 × 3 synapse chip is designed using analog four-quadrant multiplier circuits to implement synapse multiplications and update, the weights according the BEP rule, Once the BEI learning is completed, the synaptic weight values can be stored as charges on capacitors from which they can be transferred to digital memory ani periodically refreshed by interface circuits that convert the values in digital memory into analog signals. A 3-channel variable-gain neuron chip receives the sum of currents propagated forward from the previous synapse layer, provides an adjustable-gain sigmoidal-activation-function, and receive the error signals propagated backward from the output layer multiplied by the first derivative of the sigmoidal function. Custom VLSI layout. reduces the layout area of the processing elements, which in turn increases the expected network density. The modular architecture of the proposed design makes it possible to increase the size of the networ) by interconnecting multiple modular chips.
Lee, Geun Taek,Ha, Yun-Sok,Jung, Yeon Suk,Moon, Sung-Kwon,Kang, Ho Won,Lee, Ok-Jun,Joung, Jae Young,Choi, Yung Hyun,Yun, Seok-Joong,Kim, Wun-Jae,Kim, Isaac Yi Raven Press 2014 Annals of Surgical Oncology Vol. No.
<P>The DHCR24 gene that encodes 3b-hydroxysterol ??24-reductase, an oxidoreductase involved in cholesterol biosynthesis, has been identified as a progression-related gene based on the quantitative real-time PCR (qPCR) gene signature. Here, the functional role of DHCR24 and its clinical relevance in non-muscle-invasive urothelial carcinoma (NMIUC) were investigated.</P>
Baek, Seol,Kwon, Seung-Ryong,Yeon, Song Yi,Yoon, Sun-Heui,Kang, Chung Mu,Han, Seok Hee,Lee, Dahye,Chung, Taek Dong American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.7
<P>We suggest an electrochemiluminescence (ECL)-sensing platform driven by ecofriendly, disposable, and miniaturized reverse electrodialysis (RED) patches as an electric power source. The flexible RED patches composed of ion-exchange membranes (IEMs) can produce voltage required for ECL sensing by simply choosing the appropriate number of IEMs and the ratio of salt concentrations. We integrate the RED patch with a bipolar electrode on the microfluidic chip to demonstrate the proof-of-concept, i.e., glucose detection in the range of 0.5-10 mM by observing ECL emissions with naked eyes. The miniaturized RED-powered biosensing system is widely applicable for electrochemical-sensing platforms. This is expected to be a solution for practical availability of battery-free electrochemical sensors for disease diagnosis in developing countries.</P> [FIG OMISSION]</BR>
두께의 불확실성을 갖는 풍동시험 익형모델의 공력특성에 관한 수치해석 연구
이태형(Tae-Hyeong Yi),권기정(Ki-Jung Kwon),김근택(Keun-Taek Kim),안석민(Seokmin Ahn) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.6
익형 풍동시험 시 모델의 제작오차에 의해 시험 익형과 지지대 익형의 두께에서 차이가 있을 경우 시험 익형의 공력특성에 주는 영향을 양력, 항력 및 모멘트 값의 변화를 수치해석하여 비교 및 분석하였다. 이를 위해 익형모델을 세 부분으로 나누어 제작하는 경우 가운데 위치하는 시험 익형을 기준 형상으로 하여 시험 익형 양쪽에 부착하여 지지대 역할을 하는 익형의 최대두께를 가운데 익형에 비해 작게 설정하였다. 익형모델은 NACA64- 418을 사용하였으며, 난류모델은 천이현상을 잘 예측할 수 있는 Transition SST를 사용하였다. 다양한 받음각과 레이놀즈 수에서 지지대 역할을 하는 익형모델과 두께차이가 매우 큰 경우에도 가운데 위치한 시험 익형의 공력특성에 미치는 영향이 매우 작음을 확인하였다. Numerical investigation is performed to understand the effects of thickness uncertainty of a supporting airfoil due to manufacturing processes on the aerodynamic characteristics of an airfoil used for measuring data in a wind tunnel testing. This is done by comparing the coefficients of lift, drag and moment of the airfoils. In this work, the airfoil model consists of three parts, one located in the center for measuring and two outer parts used for supporting. The study is carried out with a NACA64-418 airfoil and the turbulence model of Transition SST. It is found that the effect of thickness uncertainty of the airfoils used for supporting is not significant to the performance of the test airfoil at various angles of attack and Reynolds numbers.