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광대역 이동통신 환경에서 초 분해능 방향 탐지 알고리즘의 성능 비구 분석
윤영호,박윤옥,박형래,Yun Young-Ho,Park Yoon-Ok,Park Hyung-Rae 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.8A
본 논문에서는 광대역 이동통신 환경에서 대표적인 초 분해능 방향 탐지 알고리즘들의 도래각 추정 성능을 비교, 분석한다. 먼저, 이동통신 환경에서 발생하는 angular spread 현상을 고찰하고 광대역 OFDMA 신호의 벡터채널 모델을 유도한다. 또한, OFDMA 스마트 안테나 시스템을 위한 방향 탐지 시스템의 구조를 제시하고 광대역이동통신 환경에서 WiBro 시스템을 목표 시스템(target system)으로 설정하여 초 분해능 방향 탐지 알고리즘의 도래각 추정 성능을 시뮬레이션을 통해 비교, 분석한다. In this paper, the performances of representative high resolution direction finding algorithms are evaluated and compared in wideband mobile environments. The angular spread phenomenon in mobile environments is first investigated and then a vector channel model for wideband OFDMA signals is derived. A direction finding system architecture for OFDMA smart antenna systems is proposed and finally the performances of high resolution direction finding algorithms are evaluated in wideband mobile environments by taking the WiBro system as a target system.
Lactobacillus spp. 와 Bifidobacterium spp. 의 Pulsed Field Gel Electrophoresis 에 의한 Genomic DNA 의 특성
윤영호,백영진,이재후 ( Y . H . Yoon,Y . J . Baek,J . H . Lee ) 한국축산학회 1998 한국축산학회지 Vol.40 No.1
Characteristics of genomic DNA of Lactobacillus spp. and Bifidobacterium spp. were determined by pulsed field gel electrophoresis and the following results were obtained; Four enzymes, Sma I, Apa I Not I and Sfi I were identified as suitable for generation of relatively few numbers of distinct fragments from the Lactobacillus spp. genomes, whereas five enzymes, Sma I, Apa I, Sfi I and Dra I were suitable for Bifidobacterium spp. genomes. The genome sizes of Lactobacillus spp. ranged from 1.S8Mb to 3.31Mb, the genome sizes of L. brevis ATCC 8287, L. fermentum ATCC 14931, L. casei YIT 9018, L. plantarum KCTC 1048 and L. delbruekii subsp. delbruekii ATCC 9469 were estimated to be 1.93Mb, 1.98Mb, 2.84Mb, 2.81M6 and 1.82Mb, respectively. Those of Bifidobcxterium spp. ranged from 1.85Mb to 2.83Mb. The genome sizes of B. bifrdum ATCC 29521, B. longum ATCC 15707, B. infantis ATCC 15697 and B. bifidum CU 1370 were estimated to be approximately 1.85Mb, 2.83Mb, 1.86Mb and 1.94Mb, respectively.
OFDMA 스마트 안테나 시스템을 위한 도래각 추정 기반의 적응 빔 형성 알고리즘
윤영호,박윤옥,박형래,Yun, Young-Ho,Park, Yoon-Ok,Park, Hyung-Rae 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.12A
본 논문에서는 orthogonal frequency-division multiple-access 스마트 안테나 시스템을 위한 효율적인 도래각 추정 기반의 적응 빔 형성 알고리즘을 제안한다. 제안된 알고리즘은 추정된 도래각 정보를 이용하여 원하는 신호의 방향으로 주 빔 (main beam)을 형성하는 반면, 간섭 신호의 방향에는 null을 형성함으로써 간섭 신호를 효율적으로 제거한다. 또한, 다중 경로 신호에 대한 빔 형성 출력들을 효율적으로 결합함으로써 공간 다이버시티 이득을 얻을 수 있다. 제안된 알고리즘의 효율성을 입증하기 위해 셀룰러 이동통신 환경에서 WiBro 시스템을 목표 시스템 (target system)으로 설정하여 알고리즘의 성능을 분석하고 least-sqaures 빔 형성 알고리즘과 성능을 비교한다. In this paper, an efficient direction-r)f-arrival based adaptive beamforming algorithm for orthogonal frequency-division multiple-access smart antenna systems is proposed. The proposed algorithm provides a high performance by steering main beams to the directions of a desired signal, whereas steering nulls to the directions of the interference, using the estimated directions. The beamforming outputs obtained by steering the main beams to the distinct directions of resolvable multipath signals are combined in a maximal ratio manner to exploit angular diversity gain. The performance elf the proposed algorithm is finally evaluated in cellular mobile environments to verify its efficiency and is compared with that of least-squares beamforming algorithm, by taking the WiBro system as a target system.
한우췌질(韓牛膵蛭)에 대(對)한 사종약물(四種藥物)이 시험관내(試驗管內)에서의 살충효력(殺蟲效力) 및 배란억제효력(排卵抑制效力)에 관(關)한 실험(實驗)
윤영호,이창업,Yoon, Y.H.,Lee, C.E. 대한수의학회 1968 大韓獸醫學會誌 Vol.8 No.2
Four drugs, bithionol, hexachlorophee, hexachloroethane and tetrachloroethylene, were tested on the in vitro effects of vermicidal and laying capacity inhibitory action to the Eurytrema Pancreaticum of Korean cattle, and the results obtained were as follows : 1) Of the four drugs, bithionol was most effective at both high and low concentrations. 2) The effects of hexachlorophene, hexachloroethane and tetrachloroethylene were less effective than that of bithionol, and the laying activity, at low concentration, was observed to increase at the early stage and decrease gradually thereafter. 3) Tetrachloroethylene was least effective of the four drugs.
Lactobacillus casei YIT9018 의 생존경쟁기작에 관한 연구
윤영호,윤계병,김현욱 ( Young Ho Yoon,Que Byung Yoon,Hyun Uk Kim ) 한국축산학회 1981 한국축산학회지 Vol.23 No.3
The competitive survival mechanism of Lactobacillus casei YIT9018 has been studied using Escherichia coli LDTMI in MRS and TGY media. The results obtained are summarized as follows; 1. When two oragisms were cultured together, the growth of E. coli was inhibited greatly by L. casei in MRS medium, but in TGY medium, E. coli was inhibited only slightly. 2. The growth inhibition of E. coli by L. casei was studied at the controlled pHs (pH 7, 6, 5, and 4) of MRS broth. The growth inhibition of E. coli was not distinct at pH 7 and 6, but at pH 5 and 4, E. coli was inhibited distinctively. This result means L. casei produced E. coli-inhibiting substances during its growth below pH 6.0 in MRS broth. 3. The growth inhibition of E. coli by L. casei was analyzed by cylinder plate method. MRS broth adjusted to pH 5 exhibited the inhibition zone of 4.2 ㎜ diameter against E. coli while L. casei cultured MRS broth exhibited the inhibition zone of 10 ㎜ diameter at the same pH. Inhibition zone exhibited by L. casei cultured MRS broth was the largest one among the three cultured media. 1t is apparent that production of E. coli-inhibiting substances (LC factor) by L. casei in addition to the acid production. 4. Sodium acetate in MRS medium was found to play the important role in the synthesis of LC factor by L. casei The role of sodium acetate was also evidenced in TGY medium by exhibiting the increased inhibitory activity when TGY medium was supplemented with sodium acetate and 0.2 % glucose. 5. L. casei YIT9018 was found to compete and multiply in the natural habitat by producing acid as well as LC factor.
FEMWATER 모형을 이용한 해안대수층에서의 분산지수 추정
윤영호 ( Young-ho Yoon ) 한국환경기술학회 2009 한국환경기술학회지 Vol.10 No.4
본 연구의 목적은 해안대수층에서 분산지수를 추정하는 것이다. 분산지수는 해안대수층에서 해수침투를 예측하는데 중요한 역할을 한다. 본 연구에서는 FEMWATER 모형을 이용하여 분산지수를 추정하였다. 연구대상지역은 전라북도 김제시 대창리 일원이다. 이 지역은 해수침투현상을 조사하기 위한 관측정을 운영해오고 있다. 종분산지수를 계산하는 두 개의 대표적인 방법인 Neuman(1990)방법과 Xu와 Eckstein(1995)방법을 이용하여 종분산지수를 계산하였다. 두 방법에 의한 종분산지수를 고려한 총고용물질(TDS, 염분농도)의 시간분포를 FEMWATER모형을 이용하여 모의하였다. 모의결과를 관측자료와 비교하였다. 모의결과에 의하면 Xu와 Eckstein 방법이 종분산지수를 추정하는데 더 적합한 것으로 나타났다. 횡분산지수를 추정하기 위해 횡분산지수를 종분산지수의 1/10, 2/10, 3/10, 4/10, 5/10으로 가정하여 염분농도의 시간분포를 모의하였다. 최적 횡분산지수는 종분산지수의 3/10으로 나타났다. The purpose of this study is to estimate the dispersivity in the coastal aquifer. The dispersivity takes a important role to predict the seawater intrusion in the coastal aquifer. In this study, the dispersivity is estimated by using FEMWATER model. The selected study area was around Dachang-ri, Gimje-si, Jollabuk-do. This area has observation wells which survey the seawater intrusion. The longitudinal dispersivities was calculated by Neaman(1990) method, Xu and Eckstein(1995) method, which were two typical method for longitudinal dispersivity(α<sub>L</sub>) calculation. The time series of TDS(total dissolved solids) concentrations which consider the longitudinal dispersivities by two method were simulated using FEMWATER model. The results of simulations were compared with observed data. According to the result of simulation, Xu and Eckstein method is more suitable for the longitudinal dispersivity estimation. To estimate transverse dispersivity, the time series of concentration was simulated with five variant transverse dispersivities 1/10, 2/10, 3/10, 4,10, and 5/10 of the longitudinal dispersivity. The optimal transverse dispersivity(α<sub>T</sub>) was found to be 3/10α<sub>L</sub> through the simulation.
Lactobacillus spp. 와 Bifidobacterium spp. 에 의한 돌연변이원물질 2-Nitrofluorene 에 대한 돌연변이 억제특성
윤영호(Y . H . Yoon),조중근(J . G . Cho) 한국낙농식품응용생물학회 1998 Journal of Dairy Science and Biotechnology (JMSB) Vol.16 No.2
N/A Studies on the antimutagenicity of Lactobacillus spp. and Bifidobactrium spp. against 2-nitrofluorene have been conducted utilyzing Salmonella typhimurium TA 98 in order to characterize the activity by the starter and non-starter strains. The average antimutagenic activity of Lactobacillus spp. and Bifidobactrium spp. against 2-nitrofluorene was 20.29% and L. plantarum CU 722 revealed the greatest mutation inhibition activity of 50.34%. An intensive antimutagenicity was found in the cell wall and cytoplasm fraction of L. plantarum CU 722 in skim milk culture showing inhibition rate of 34.9% and 24.5% respectively and very low activity remained in cell free broth and in lactic acid The optimum cultivation time for Lactobacillus spp. and Bifidobacterium spp. to inhibit mutation was 24 hours and the optimum preincubation time of the reaction mixture containing the mutagen, lactic culture and indicator strain was 60 minutes, and the optimum incubation time for the test elates was 48 hours.