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탄소나노튜브 전극을 이용한 플렉시블 반사형 디스플레이의 구동 특성
황인성,김영조,Hwang, In-Sung,Kim, Young-Cho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
To compare an electrical and optical characteristics of indium tin oxide (ITO) and carbon nanotube (CNT) electrode on flexible and reflective display, we fabricate two charged particle-type display panels under the same panel condition of which the width of ribs is 10 ${\mu}m$, the cell size is $300{\mu}m{\times}300{\mu}m$, the q/m value of the white particles is -4.3 ${\mu}C/g$ and that for the black is +1.3 ${\mu}C/g$, and the cell gap is 75 ${\mu}m$, 125 ${\mu}m$, and 175 ${\mu}m$. We use plastic substrates coated with ITO and CNT electrode. To evaluate optical property, we measure a response time of particles using a laser and a photodiode. Threshold and driving voltages of CNT electrode according to the sheet resistance of 300, 600, 1,000 (ohm/sq) are compared with ITO electrode of 10 (ohm/sq). A response time of the CNT panel is similar to that of ITO panel, but the threshold and driving voltages of CNT panel are higher than that of ITO panel, inducing a large bombardment of the particles and shortening the lifetime of the panel. High difference of a threshold and a driving voltage of CNT panel will induce an particle clumping, resulting degradation of the panel. A bending radius of the fabricated CNT panel is 18 ${\mu}m$.
황인성,장덕우,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study is intended to develop AE water reducing agent for reduction of bleeding and investigate its practical use. According to the results, fluidity and air content increases with an increase of superplasticizer and MC viscosity agent, AE water reducing agent for reduction of bleeding is developed after determining the ratio of superplasticizer and MC viscosity agent as 3:1 to satisfy the same fluidity and air content to conventional concrete and reduce bleeding amount. As the adding ratio of developed AE water reducing agent for reduction of bleeding increases, fluidity also increases, air content satisfies the aimed range, bleeding and sinking amount of concrete are reduced, and compressive strength is almost not different from plain concrete. Therefore, developed AE water reducing agent for reduction of bleeding satisfies the aimed air content in the range of slump 12~21cm, and can also reduce bleeding amount effectively without quality deterioration of compressive strength.
수면 거칠기에 따른 수면 경로의 시변 통신채널 통계적 특성 분석
황인성,최강훈,최지웅 한국음향학회 2023 韓國音響學會誌 Vol.42 No.6
해수면 거칠기에 의해 해수면 산란이 발생하면 통신신호의 주파수 확산과 통신채널 시변동성을 야기하여통신성능을 악화시킨다. 수면 거칠기에 따른 통신채널의 시변동성 차이를 비교하기 위하여 한양대학교 해양음향공학연구실 수조에서 실험을 수행하였다. 수조에서 인위적인 수면 거칠기를 생성하고 대역폭에 따른 차이를 비교하기 위하여 3가지 대역폭을 갖는 통신신호를 사용하였다. 측정된 수면 거칠기는 레일리 파라미터로 변환하여 거칠기에 대한파라미터로써 사용하였으며, 수면 경로의 시변 채널 특성은 도플러 확산과 상관시간을 이용하여 통계적 분석을 수행하였다. 수면 경로의 도플러 확산은 통신신호의 반송 주파수와 대역폭의 영향을 보정한 가중 유효 도플러 확산(Weighted Root Mean Square Doppler spread, )을 사용하였다. 수면 경로의 상관시간과 직접 경로와 수면 경로의 에너지 비율을 이용하여 전체 채널의 상관관계를 모의하고 측정된 전체 채널의 상관시간과 비교하였다. 본 연구에서는 해수면 거칠기에 따른 해수면 경로의 시변 채널특성을 이용하여 임의의 해양환경에서 효율적인 통신신호 설계를위한 방법을 제안한다. Scattering by Sea surface roughness occurs due to sea level roughness, communication performance deteriorates by causing frequency spread in communication signals and time variation in communication channels. In order to compare the difference in time variation of underwater acoustic communication channel according to the surface roughness, an experiment was performed in a tank owned by Hanyang University Ocean Acoustics Lab. Artificial surface roughness was created in the tank and communication signals with three bandwidths were used (8 kHz, 16 kHz, 32 kHz). The measured surface roughness was converted into a Rayleigh parameter and used as a roughness parameter, and statistical analysis was performed on the time-varying channel characteristics of the surface path using Doppler spread and correlation time. For the Doppler spread of the surface path, the Weighted Root Mean Square Doppler spread ( ) that corrected the effect of the carrier frequency and bandwidth of the communication signal was used. Using the correlation time of the surface path and the energy ratio of the direct path and the surface path, the correlation of total channels was simulated and compared with the measured correlation time of total channels. In this study, we propose a method for efficient communication signal design in an arbitrary marine environment by using the time-varying characteristics of the sea surface path according to the sea surface roughness.
물시멘트비 및 시멘트 요인에 따른 콘크리트의 초기 압축강도 발현 특성
황인성,한천구,이승훈,김규동 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.4
This study discusses compressive strength development of concrete at early age with water cement ratio(W/C) and cement factors. According to the results, as W/C decreases, compressive strength at early stage increases. It takes about 15 hours, 17.5 hours and 21 hours in W/C of 40%, 45% and 50%, respectively, to gain 5MPa of concrete strength, so it can be shortened by about 3 hours with every decrease of W/C of 5%. Compressive strength of ordinary portland cement(OPC) A at early age is larger than that of OPC B, and so it proves that the strength variances among the cement manufacturing company exist to some degree. As for the kinds of cement, compressive strength shows larger value in order of alumina cement(ALC), high-early-strength portland cement(HPC) and OPC. When OPC is replaced with HPC by 50%, compressive strength at early age increases in comparison with that of OPC. When OPC is replaced with ALC by 5% and 10%, setting time is shortened, but compressive strength at early age decreases in comparison with OPC. As fineness of cement increases, compressive strength at early age also increases. As compressive strength development at early age increases, the time to gain 5MPa of concrete strength is shortened. The coefficient of correlation between compressive strength and the rebound value of P type schmidt hammer is very favorable. Therefore, if the rebound value of P type schmidt hammer is more than 25, it is thought that the removal time of the side forms can be determined effectively.
On scaled cumulative residual Kullback-Leibler information
황인성,박상언 한국데이터정보과학회 2013 한국데이터정보과학회지 Vol.24 No.6
Cumulative residual Kullback-Leibler (CRKL) information is well defined on the em-pirical distribution function (EDF) and allows us to construct a EDF-based goodness of fit test statistic. However, we need to consider a scaled CRKL because CRKL is not scale invariant. In this paper, we consider several criterions for estimating the scale parameter in the scale CRKL and compare the performances of the estimated CRKL in terms of both power and unbiasedness.