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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.
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.
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.
윤영호 ( Young-ho Yoon ),이호진 ( Ho-jin Lee ),유병로 ( Byong-ro Ryu ) 한국환경기술학회 2004 한국환경기술학회지 Vol.5 No.3
해양방류하수의 근역혼합거동은 방류시설이 설치된 지역의 주변 환경특성에 영향을 받는다. 영향을 미치는 주된 환경영향변수들은 주변수 밀도 성층과 주변수의 유속이다. 계절변화가 해양방류하수의 근역혼합거동에 미치는 영향을 평가하기 위해서 여름철 주변수의 밀도성층이 이루어진 마산해양방류시설에서 근역혼합거동을 모의하였고, 또 겨울철의 비성층 특성을 나타내는 속초해양방류시설의 근역혼합거동을 모의하였다. 여름철 마산해양방류시설의 근역혼합특성과 겨울철 속초해양방류시설의 근역혼합특성을 비교함으로써 계절변화가 해양방류하수의 근역혼합과정에 미치는 영향을 조사하였다.정에 미치는 영향을 조사하였다. The near field mixing behaviors of ocean outfall plumes which depend on ambient environmental parameters at ocean outfall site. The major environmental parameters are ambient water-density stratification, ocean current velocity. To evaluate the effect of seasonal variation on near field mixing behaviors, under the typical summer condition of water-density stratification at the Masan outfall, nearfield mixing behaviors are simulated. Also, under the typical winter condition of water-density unstratification at the Sokcho outfall, those are simulated. Comparing near field mixing characteristics of Masan outfall in Summer with those of Sokcho outfall in winter, the effect of seasonal variation on near field mixing processes of ocean outfall plume are investigated.
윤영호(Young Ho Yoon),양영성(Young Sung Yang) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.3
The test is carried out in order to make clear the mechanical properties of the structural welded wire fabric with variables such as tensile strength, reduction of area, elongation, melding point shear strength and bendability. The results are as follows : 1) The test piece across the welds about tensile strength is slightly higher than between the welds, and the elongation is opposite. 2) Welding point shear strength is considerably high, but if the strength is much increased, tensile strength get low by brittleness of welding point. Accordingly it is necessary to establish the shear strength as 15 kgf/㎟(150N/㎟). 3) The bend test should be carried out at welding point, the ductility of which is the smallest.
무기체계 양산단계 자동화 시험장비(ATE) SW 신뢰성 향상 방안 연구
윤영호(Young-Ho Yoon),구기영(Ki-Young Ku),금종주(Jong-Joo Keum),황운희(Un-Hee Hwang),우순(Soon Woo) 大韓電子工學會 2010 電子工學會論文誌-SC (System and control) Vol.47 No.6
본 연구는 국내 무기체계 양산단계에서 적용되고 있는 ATE 장비의 SW 신뢰성 확보 및 양산단계에서의 관리를 위한 방안을 제안하였다. 국내 무기체계 획득분야 중 양산단계 ATE 장비의 개발 · 관리에 대한 프로세스 정립이 미흡하여 이를 개선을 위해 ATE의 정의에서부터 ATE 장비 신뢰성 확보 및 관리 방안의 선진국 사례, 국내 현황 등을 살펴보고 국내 현실에 맞는 ATE 장비의 신뢰성 검증 방안 및 개발 · 관리 분야에서 개선해야 할 점을 살펴보았다. ATE 장비의 신뢰성을 확보하기 위해서는 방산업체에서는 각종 ATE 개발 프로세스의 구축이 필요하며, 정부 품질보증기관은 양산단계 ATE 개발 · 관리를 위해 ATE 장비 개발 시 단계별 위험요소 식별, 위험관리 활동 및 개발완료단계에서 품질평가 활동을 통해 ATE 장비의 신뢰성을 확보해야 할 것이다. Nowadays, the high technology weapons system has been developed and the importance of ATE which measures the test specification is growing bigger and bigger. So the ATE software reliability becomes critical but the regulation of ATE development/management is less inadequate than that of DoD. In this paper, the improvement way of the ATE software reliability verification and ATE development/management processes were proposed.