http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고분자 전해질 연료전지에서 Pinhole 있는 막의 열화
김태희,이호,임태원,박권필 한국수소및신에너지학회 2008 한국수소 및 신에너지학회논문집 Vol.19 No.2
The most failure mode of PEM fuel cell is gas crossover caused by pinhole formation in MEAs. The degradation phenomena of MEA with pinholes were evaluated in various accelerated operation condition, such as OCV, low humidity and high partial pressure of oxygen. The performances of MEA with pinholes were almost same before and after normal 144 hours operation(70℃, 640mA/cm2, 65%RH H2/air). The results of accelerated operation showed that OCV and low humidity condition more deteriorated MEA than gas crossover owing to pinholes. When oxygen was used as cathode gas, the pinholes of MEA were enlarged due to heat of combustion reaction on Pt catalyst of electrodes. This combustion reaction occurred at pinholes near gas inlet and resulted in local MEA failure.
Quantitative analysis of nano-defects in thin film encapsulation layer by Cu electrodeposition
Chu, Kunmo,Bae, Ki Deok,Song, Byong Gwon,Kim, Jaekwan,Park, Yong Young,Xianyu, Wenxu,Lee, Chang Seung,Sohn, Yoonchul Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.453 No.-
<P><B>Abstract</B></P> <P>Thin-film encapsulation (TFE) is of great importance as a barrier film to protect organic devices and displays. A serious problem with the application of TFE is degradation of organic devices with penetration of oxygen and water vapor through pinholes having sub-micron size. Though many studies were tried to identify the pinholes, quantitative analysis of pinhole area has not been found yet. In this study, total pinhole area in TFE layer was quantitatively analyzed with the help of the Cu bumps electrodeposited on the pinholes. Empirical growth rate of the Cu bumps revealed that bump radius (r) and plating time (t) had a relationship of r<SUP>3</SUP> ∝ t. While size of the pinholes was deduced from starting point of Cu bump growth, number of the pinholes was extracted from size distribution of the Cu bumps. Unique feature of Cu bump morphology is also explained with a compositional analysis, demonstrating dissolution of Ni underlayer and its involvement in the formation of the Cu bumps.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Quantitative analysis of the pinholes in SiON thin film encapsulation is provided. </LI> <LI> Kinetic growth rate of electrodeposited Cu bumps on the pinholes was established. </LI> <LI> Pinhole size was deduced from the kinetic growth curve of the Cu bumps. </LI> <LI> Dissolved Ni underlayer involved in the formation of the Cu bumps. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sasaya, Tenta,Sunaguchi, Naoki,Seo, Seung-Jum,Hyodo, Kazuyuki,Zeniya, Tsutomu,Kim, Jong-Ki,Yuasa, Tetsuya Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.886 No.-
<P><B>Abstract</B></P> <P>Gold nanoparticles (GNPs) have recently attracted attention in nanomedicine as novel contrast agents for cancer imaging. A decisive tomographic imaging technique has not yet been established to depict the 3-D distribution of GNPs in an object. An imaging technique known as pinhole-based X-ray fluorescence computed tomography (XFCT) is a promising method that can be used to reconstruct the distribution of GNPs from the X-ray fluorescence emitted by GNPs. We address the acceleration of data acquisition in pinhole-based XFCT for preclinical use using a multiple pinhole scheme. In this scheme, multiple projections are simultaneously acquired through a multi-pinhole collimator with a 2-D detector and full-field volumetric beam to enhance the signal-to-noise ratio of the projections; this enables fast data acquisition. To demonstrate the efficacy of this method, we performed an imaging experiment using a physical phantom with an actual multi-pinhole XFCT system that was constructed using the beamline AR-NE7A at KEK. The preliminary study showed that the multi-pinhole XFCT achieved a data acquisition time of 20 min at a theoretical detection limit of approximately 0.1 Au mg/ml and at a spatial resolution of 0.4 mm.</P>
Effect of nano-pinholes within ceramic electrolytes of thin-film solid oxide fuel cells
박태현,이예근,차석원,장익황 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
The effect of nano-pinholes in the ceramic electrolyte (yttria-stabilized zirconia) on the performance of athin-film solidoxide fuel cell(SOFC) is investigated.As a result, the open-circuitvoltage of the thin-film SOFCwas not severely affected by the existence and the size of a pinhole. However, the pinhole induced a criticalelectrical shortage between the anode and cathode if the cathode was deposited onto the pinhole. Thus, anano-sized pinholedoes not significantly induce fuel crossoverorcritically reduce the performance. It could,however, reduce the performance significantly during the common fabrication step, i.e. deposition of thin-film cathode on an electrolyte, of a thin-film SOFC, especially for larger pinholes.
강민구 ( Min-goo Kang ),조문신 ( Moon-shin Zo ),전종서 ( Jong-suh Jeon ) 한국인터넷정보학회 2012 인터넷정보학회논문지 Vol.13 No.3
본 논문에서는 APD(Avalanche photodiode)센서와 LED조명 및 광섬유 도파관(Fiber optic waveguide)를 이용한 광전((光電, Photoelectric) 영상 검출시스템을 제안한다. 제안한 핀홀(Pinhole) 검출시스템은 100미크론의 핀홀을 1,000mpm(meter per minute)의 속도로 검출할 수 있다. 아울러, 영상검출 알고리듬을 통해 검출된 핀홀의 위치와 크기 별로 분류할 수 있는 SQL기반의 DB결과를 분석함으로서 영상검출시스템의 검출성능이 개선되었다. In this paper, a photoelectric image detection system is proposed using an APD(Avalanche Photodiode) sensor, a LED illuminator, and fiberoptic waveguides. This proposed pinhole detection system can detect the pinholes of 100 micron with the speed rate of 1,000mpm(meter per minute). And detecting performance of image system is improved by the SQL based DB analysis of classifying pinhole`s detected location and size using image detection algorithms.
양윤상(Yoon-Sang Yang),이동훈(Dong-Hoon Lee),고재필(Jae-Pil Koh) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.2
An acoustical model for detecting the leak location in a buried gas pipeline has been developed. This model is divided into an experimental model for sound diagnosis, and a theoretical model for sound prediction, which is based on the transfer matrix method, representing the sound pressure and the volume velocity as state variables. The power spectrum is measured by attaching only one microphone to the closed end pipe. It has been shown that the response magnitude of acoustic pressure signals calculated by the acoustical model depends upon the thickness and diameter of a pinhole. The validity for the acoustical model has been verified through a comparison between the measured and calculated results.
Development of a Fine Digital Sun Sensor for STSAT-2
Sung-Ho Rhee,Joon Lyou 한국항공우주학회 2012 International Journal of Aeronautical and Space Sc Vol.13 No.2
Satellite devices for fine attitude control of the Science & Technology Satellite-2 (STSAT-2). Based on the mission requirements of STSAT-2, the conventional analog-type sun sensors were found to be inadequate, motivating the development of a compact, fast and fine digital sun sensor (FDSS). The FDSS uses a CMOS image sensor and has an accuracy of less than 0.03degrees, an update rate of 5㎐ and a weight of less than 800g. A pinhole-type aperture is substituted for the optical lens to minimize its weight. The target process speed is obtained by utilizing the Field Programmable Gate Array (FPGA), which acquires images from the CMOS sensor, and stores and processes the image data. The sensor accuracy is maintained by a rigorous centroid algorithm. This paper describes the FDSS designs, realizations, tests and calibration results.
Development of a Fine Digital Sun Sensor for STSAT-2
Rhee, Sung-Ho,Lyou, Joon The Korean Society for Aeronautical and Space Scie 2012 International Journal of Aeronautical and Space Sc Vol.13 No.2
Satellite devices for fine attitude control of the Science & Technology Satellite-2 (STSAT-2). Based on the mission requirements of STSAT-2, the conventional analog-type sun sensors were found to be inadequate, motivating the development of a compact, fast and fine digital sun sensor (FDSS). The FDSS uses a CMOS image sensor and has an accuracy of less than 0.03degrees, an update rate of 5Hz and a weight of less than 800g. A pinhole-type aperture is substituted for the optical lens to minimize its weight. The target process speed is obtained by utilizing the Field Programmable Gate Array (FPGA), which acquires images from the CMOS sensor, and stores and processes the image data. The sensor accuracy is maintained by a rigorous centroid algorithm. This paper describes the FDSS designs, realizations, tests and calibration results.
Shack -Hartann 파면분석기와 점광원을 이용한 광학부품의 수차 측정
이진석 ( Jin Seok Lee ),김학영 ( Hak Young Kim ),박영필 ( Yong Pil Park ),박노철 ( No Cheol Park ),한재원 ( Jae Won Hahn ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Using a Shack-Hartmann sensor, we construct an optical testing system measuring the wavefront error of small optical components. The systematic error of the sensor is compensated with a reference plane-wave system that produces almost perfect plane waves. Several types of lenses are tested using a point source that generates spherical waves emitted from a pinhole. The results of the optical testing obtained with the ShackHartman sensor are compared with those measured with Zygo interferometer.