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Serum Protein Values of Racehorse in Korea
이창우,이성엽,이승모,엄영호,Lee Chang-Woo,Lee Sung-Yub,Lee Sung-Mo,Eom Yeong-Ho The Korean Society of Veterinary Clinics 1987 한국임상수의학회지 Vol.4 No.2
임상적으로 건강하고 휴식상태에 있는 한국 경주마의 혈청단백질치를 조사하였다. 총단백질농도는 6.5$\pm$0.3g/100ml(평균$\pm$표준편차)이였다. 알부민 농도는 3.4$\pm$0.2, $\alpha$-글로부린 농도는 0.8$\pm$0.1, $\beta$-글로부린 농도는 1.2$\pm$0.2, ${\gamma}$-글로부린 농도는 1.1$\pm$0.3g/100ml이었으며, A/G 비는 1.15$\pm$0.21이었다. 성, 연령, 계절에 따르는 혈청단백질치의 차이를 통계적으로 분석하여 보고하였다.
저압 초음파 분무 공정을 이용한 γ-Fe<sub>2</sub>O<sub>3</sub> 나노입자의 합성
이창우,김순길,좌용호,이재성,Lee, Chang-Woo,Kim, Soon-Gil,Choa, Yong-Ho,Lee, Jai-Sung 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.1
This study was focused on the optimization of low-pressure ultrasonic spraying process for synthesis of pure ${\gamma}-Fe_2O_3$ nanoparticles. As process variables, pressure in the reactor, precursor concentration, and reaction temperature were changed in order to control the chemical and microstructural properties of iron oxide nanoparticles including crystal phase, mean particle size and particle size distribution. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies revealed that pure ${\gamma}-Fe_2O_3$ nanoparticles with narrow particle size distribution of 5-15 nm were successfully synthesized from iron pentacarbonyl ($Fe(CO)_{5}$) in hexane under 30 mbar with precursor concentrations of 0.1M and 0.2M, at temperatures over $800^{\circ}C$. Also magnetic properties, coercivity ($H_c$) and saturation magnetization ($M_s$) were reported in terms of the microstructure of particles based on the results from vibration sampling magnetometer (VSM).
Low Complexity Decoder for Space-Time Turbo Codes
이창우,Lee Chang-Woo The Korea Institute of Information and Commucation 2006 韓國通信學會論文誌 Vol.31 No.4c
By combining the space-time diversity technique and iterative turbo codes, space-time turbo codes(STTCS) are able to provide powerful error correction capability. However, the multi-path transmission and iterative decoding structure of STTCS make the decoder very complex. In this paper, we propose a low complexity decoder, which can be used to decode STTCS as well as general iterative codes such as turbo codes. The efficient implementation of the backward recursion and the log-likelihood ratio(LLR) update in the proposed algorithm improves the computational efficiency. In addition, if we approximate the calculation of the joint LLR by using the approximate ratio(AR) algorithm, the computational complexity can be reduced even further. A complexity analysis and computer simulations over the Rayleigh fading channel show that the proposed algorithm necessitates less than 40% of the additions required by the conventional Max-Log-MAP algorithm, while providing the same overall performance.
Efficient Method to Implement Max-Log-MAP Algorithm: Parallel SOVA
이창우,Lee, Chang-Woo The Korea Institute of Information and Commucation 2008 韓國通信學會論文誌 Vol.33 No.6C
The efficient method to implement the Max-Log-MAP algorithm is proposed by modifying the conventional algorithm. It is called a parallel soft output Viterbi algorithm (SOVA) and the rigorous proof is given for the equivalence between the Max-Log-MAP algorithm and the parallel SOVA. The parallel SOVA is compared with the conventional algorithms and we show that it is an efficient algorithm implementing the modified SOVA in parallel.
Efficient Conversion of DCT Coefficients to H.264 Transform Coefficients Using Lapped Transforms
이창우,Lee, Chang-Woo The Korea Institute of Information and Commucation 2007 韓國通信學會論文誌 Vol.32 No.7c
In order to convert MPEG-2 into H.264 format in ubiquitous communication environments, the efficient conversion of the discrete cosine transform (DCT) coefficients to H.264 transform coefficients is essential. In this paper, two efficient conversion systems are proposed. The proposed systems are composed of two parts. In the first part, the DCT coefficients are denoised using the lapped transform (LT) to reduce the quantization noises and blocking effects. In the second part, the denoised DCT coefficients are converted into the integer transform (IT) coefficients of H.264. Simulation results show that the proposed methods provide visually fine images. Moreover, the computational complexity of the proposed method is reduced compared with the conventional method, since the number of the DCT coefficients, which should be converted, is reduced in the first part.
강유전체게이트 전계효과 트랜지스터의 정보저장특성 향상을 위한 $SrBi_2Nb_2O_9$ 박막의 급속 결정성장방법
이창우,Lee, Chang-Woo 한국마이크로전자및패키징학회 2005 마이크로전자 및 패키징학회지 Vol.12 No.4
Pt-$SrBi_2Nb_2O_9(SBN)-Pt-Y_2O_3-Si$ 게이트 전계효과 트랜지스터 (MFMISFETs)의 정보저장 특성향상을 위하여 SBN 박막을 산소 플라즈마 내에서 급속열처리 하였다. 그 결과 SBN 박막의 결정크기는 $700^{\circ}C$의 동일한 열처리조건에서 급속열처리한 SBN 결정립의 크기가 전기로 열처리에 의한 SBN 결정립보다 4배 이상 성장하였다. 또한 분극 특성을 비교한 결과 잔류분극은 2배이상 급속열처리 방법으로 제조된 SBN 박막을 이용한 MFMISFET의 메모리윈도우 (memory window)와 on/off상태의 정보저장특성(programming characteristics)은 월등히 향상되었다. Pt-$SrBi_2Nb_2O_9(SBN)-Pt-Y_2O_3-Si$ gate field effect transistors (MFMISFETs) have been fabricated and the SBN thin films are rapid thermal annealed in oxygen plasma. The grain size of the SBN becomes 4 times much larger than that of furnace annealed SBN films even at the same annealing temperature of $700^{\circ}C$, remnant polarization value of Pt-SBN-Pt is improved by 2 times. Using the rapid grain growth of SBN for the MFM-ISFET, memory window and programming characteristics of on/off states are fairly well improved.