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HWANG, Jonghee,CHOI, Yongwoo,CHOE, Yoonsik The Institute of Electronics, Information and Comm 2011 IEICE transactions on electronics Vol.94e.c No.5
<P>Motion blur in TFT-LCD is caused by sample and hold characteristic, slow response time of liquid crystal, and the inconsistency between object tracking of the human eye and the actual object location. In order to solve this problem, a high frame rate driving method based on motion estimation and motion compensation has been applied to LCD products. However, as the required processing time of motion estimation increases in LCD TV and monitor systems, real-time video image processing becomes more difficult. Frame interpolation through the large macro block (MB) size has limitations to detect small objects. So, this paper proposes the efficient motion estimator architecture which uses seven kinds of macro blocks to enhance the accuracy of motion estimation and combines the parallel processing with pre-computation technology and hardware optimization for high-speed processing. Also, for increased efficiency in the hardware architecture, we employed an I2C (Inter Integrated Circuit) communication unit to control the key parameters easily through the personnel computer. Simulation results show that the critical path at the motion estimator is reduced by about 27.47% compared to the conventional structure. As a result, the proposed motion estimator will be applicable for the high-speed frame interpolation of variable video.</P>
다양한 블록 크기의 전역 탐색 알고리즘을 위한 효율적인 구조를 갖는 움직임 추정기 설계
황종희(Jonghee Hwang),최윤식(Yoonsik Choe) 大韓電子工學會 2009 電子工學會論文誌-SD (Semiconductor and devices) Vol.46 No.11
움직임 추정은 영상 부호화 시스템에서 큰 비중을 차지하는 부분으로, 실시간 동작을 위해서는 효율적인 구조를 필요로 한다. 따라서 H.264 전체 시스템을 위한 움직임 추정기 블록의 구현은 부호화 과정을 고속으로 수행할 수 있도록 별도의 전용 하드웨어 모듈로 설계하는 것이 바람직하다. 본 논문에서는 많은 연산량을 효율적으로 줄일 수 있도록 병렬 처리를 바탕으로 움직임 추정 감지 블록, 41개의 SAD(Sum of Absolute Difference)값 계산 블록, 최소의 SAD값 계산과 움직임 벡터 생성 블록을 제안하고자 한다. 움직임 추정 감지 블록과 최소의 SAD값 계산기에서는 선계산(pre-computation) 방법을 적용함으로써, 입력 Switching Activity를 줄여 고속 구현이 가능하도록 하였으며, 움직임 추정 감지 블록과 41개의 SAD값 계산 블록에서 가장 많은 부분을 차지하는 가산기 구조를 일반적으로 사용되는 Ripple Carry Adder 대신에 Carry Skip Adder를 적용함으로써, Adder Tree 구조를 고속으로 처리할 수 있도록 하였다. 또한 외부에서 탐색 영역 제어와 같은 주요 변수를 쉽게 제어할 수 있도록 하여, 하드웨어 구조의 효율성을 높였다. 시뮬레이션 및 FPGA 검증 결과, 움직임 추정기의 임계 경로를 발생시키는 MED블록에서 일반적인 구조를 적용했을 때보다 19.89%의 Delay 감소 효과를 얻을 수 있었다. The motion estimation in video encoding system occupies the biggest part. So, we require the motion estimator with efficient structure for real-time operation. And for motion estimator's implementation, it is desired to design hardware module of an exclusive use that perform the encoding process at high speed. This paper proposes motion estimation detection block(MED), 41 SADs(Sum of Absolute Difference) calculation block, minimum SAD calculation and motion vector generation block based on parallel processing. The parallel processing can reduce effectively the amount of the operation. The minimum SAD calculation and MED block uses the pre-computation technique for reducing switching activity of the input signal. It results in high-speed operation. The MED and 41 SADs calculation blocks are composed of adder tree which causes the problem of critical path. So, the structure of adder tree has changed the most commonly used ripple carry adder(RCA) with carry skip adder(CSA). It enables adder tree to operate at high speed. In addition, as we enabled to easily control key variables such as control signal of search range from the outside, the efficiency of hardware structure increased. Simulation and FPGA verification results show that the delay of MED block generating the critical path at the motion estimator is reduced about 19.89% than the conventional strukcture.
Hwang, Bosun,Han, Jonghee,Choi, Jong Min,Park, Kwang Suk Mary Ann Liebert 2008 TELEMEDICINE JOURNAL AND E HEALTH Vol.14 No.9
<P>The purpose of this study was to develop an unobtrusive energy expenditure (EE) measurement system using an infrared (IR) sensor-based activity monitoring system to measure indoor activities and to estimate individual quantitative EE. IR-sensor activation counts were measured with a Bluetooth-based monitoring system and the standard EE was calculated using an established regression equation. Ten male subjects participated in the experiment and three different EE measurement systems (gas analyzer, accelerometer, IR sensor) were used simultaneously in order to determine the regression equation and evaluate the performance. As a standard measurement, oxygen consumption was simultaneously measured by a portable metabolic system (Metamax 3X, Cortex, Germany). A single room experiment was performed to develop a regression model of the standard EE measurement from the proposed IR sensor-based measurement system. In addition, correlation and regression analyses were done to compare the performance of the IR system with that of the Actigraph system. We determined that our proposed IR-based EE measurement system shows a similar correlation to the Actigraph system with the standard measurement system.</P>
Hwang, Do-Hoon,Lee, Sunyoung,Kim, Ji-Hoon,Lee, Jonghee Elsevier 2012 Current Applied Physics Vol.12 No.suppl1
<P><B>Abstract</B></P><P>A solution processible deep blue light-emitting molecule composed of pyrene and dialkylfluorene units, 1,6-bis(9,9′-dioctylfluorene-2-yl)pyrene (BDOFP) was synthesized and characterized. The synthesized compound was soluble in common organic solvents and the solution gave a smooth thin film after spin coating. The compound was characterized by using thermogravimetric analysis (TGA), differential calorimetry (DSC), UV–visible spectroscopy, fluorescence spectroscopy and cyclic voltammetry. The maximum UV–visible absorption and PL emission of BDOFP thin film were more red-shifted than those of BDOFP solution due to strong intermolecular interaction between flat segments. To improve color purity and film stability BDOFP was doped to a well-known charge-transporting polymer, poly(<I>N</I>-vinylcarbazole) (PVK). BDOFP thin film showed it maximum PL at 457 nm but the thin films of BDOFP doped PVK films showed it at 443 nm. Organic light-emitting diodes were fabricated with the simple structure of ITO/PEDOT:PSS/emitter/BmPyPB/LiF/Al configuration. BDOFP or three kinds of BDOFP:PVK blends with different ratios (10:90, 30:70, 50:50 by weight) were used as the emissive layers and [1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene] (BmPyPB) as the electron-transporting layer. All of light-emitting devices showed their electroluminescence in blue region of spectrum, especially EL using BDOFP: PVK (1:9) showed a deep-blue light emission with CIE coordinates of (0.14, 0.07). Maximum brightness, external quantum efficiency and current efficiency of the device were 500 cd/m<SUP>2</SUP>, 0.7% and 0.44 cd/A, respectively.</P>
Ham, Hyung Chul,Hwang, Gyeong S.,Han, Jonghee,Nam, Suk Woo,Lim, Tae Hoon American Chemical Society 2010 The Journal of Physical Chemistry Part C Vol.114 No.35
<P>Using first principles calculations, we examine how the ensemble effect on the performance of bimetallic catalysts is affected by the change of surface electronic structure associated with their geometric parameters. We look at H<SUB>2</SUB>O<SUB>2</SUB> formation from H<SUB>2</SUB> and O<SUB>2</SUB> based on three different Pd monomer systems including AuPd adlayers with a Pd monomer each on Pd(111) [AuPd<SUB>M</SUB>/Pd(111)] and Au(111) [AuPd<SUB>M</SUB>/Au(111)] and a 55-atom cluster with Au<SUB>41</SUB>Pd shell and Pd<SUB>13</SUB> core [Au<SUB>41</SUB>Pd@Pd<SUB>13</SUB>]. Our calculations show that H<SUB>2</SUB>O<SUB>2</SUB> selectivity tends to be significantly deteriorated in the Au<SUB>41</SUB>Pd@Pd<SUB>13</SUB> and AuPd<SUB>M</SUB>/Au(111) cases, as compared to the AuPd<SUB>M</SUB>/Pd(111) case. This is largely due to enhancement of the activity of corresponding surface Pd and its Au neighbors, while isolated Pd surface sites surrounded by less active Au are responsible for the H<SUB>2</SUB>O<SUB>2</SUB> formation by suppressing O−O cleavage. This study highlights that ensemble contributions in multimetallic nanocatalysts can be a strong function of their geometric conditions, particularly local strain and effective atomic coordination number at the surface, that are directly related to surface electronic states.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2010/jpccck.2010.114.issue-35/jp102851d/production/images/medium/jp-2010-02851d_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp102851d'>ACS Electronic Supporting Info</A></P>
황종희,임태영,이미재,김진호,Hwang, Jonghee,Lim, Tae-Young,Lee, Mi Jai,Kim, Jin-Ho 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.1
Recently, the use of ion-exchange strengthened glass has increased sharply, as it is now used as the cover glass for smart phone devices. Therefore, many researchers are focusing on methods that can be used to strengthen ion-exchange glass. However, research on how the improved strength can be maintained under thermal environment of device manufacturing is still insufficient. We tested the degradation of the characteristics of ion-exchange soda-lime glass samples, including their surface compressive stress characteristics, the depth of the ion-exchange layer (DOL), flexural strength, hardness, and modulus of rupture (MOR) values. Degradation of the characteristics of the ion-exchange glass samples occurred when they were heat-treated at a temperature that exceeded $350^{\circ}C$.