http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강민수,김봉수,김광선,홍주연,이영승,김중빈,변우진,Kang, M.S.,Kim, B.S.,Kim, K.S.,Hong, J.Y.,Lee, Y.S.,Kim, J.B.,Byun, W.J. 한국전자통신연구원 2015 전자통신동향분석 Vol.30 No.3
모바일 빅뱅이라고 불리는 모바일 데이터 전송량의 폭발적인 증가로 촉발된 5G 이동통신에 대한 논의는 현재 ITU-R(International Telecommunication Union-Radio-communication)에서 5G 이동통신 네트워크 서비스 비전에 대한 직업을 진행 중이다. 5G 이동통신의 면적당 전송용량을 만족하기 위해서는 소형셀 형태로의 진화는 필연적이다. 본고에서는 5G 이동통신망 구성의 한 축을 담당할 것으로 예상되는 고정 무선링크 기술에 대한 개발동향을 소개한다. 고정 무선링크에 대한 사용 용도, 시장전망 그리고 현재 고정 무선링크 용도로 사용이 가능한 주파수 분배 현황에 대하여 살펴보고, 최근 고정 무선링크와 관련하여 시스템에 적용 중인 기술들과 새롭게 연구 중인 LOS(Light of Sight)-MIMO(Multi-Input Multi-Output), OAM(Orbital Angular Momentum) 등 관련 기술에 대한 개발동향을 소개한다.
강민수(Kang M. S.),이현종(H. J. Lee),정창조(C. C. Choung) 제주학회 2004 濟州島硏究 Vol.25 No.-
The eating and resting behaviour of 10 lactating Jeju native mare ponies on pasture with free access to water were recorded frome 10:00 hr. Lactating mares on the pasture spent 57.0%(239 minute) of the time foraging in spring and 47.9% to 71.1% in summer and 60.8%(219 minute) in fall. Time spent for resting by mares was 24.1% during May and 35% in July, 18.1% in August and 22.8% in October. As the foals grew older, the number of feedings decreased with the highest in May at 11.8 times during the observation period. 7.3 times in June, 9.9 times in July and 5.5 times in November. A similar tendency was observed in suckling time, greatest in Jun(73 sec.) 79 seconds in May, 54 seconds in July and 32.1 seconds in November. Number of urinations during observation was greater in spring(3.0) and summer(3.0), but decreased in fall(1.4 times). Number of defecations gradually increased frome spring(3.0 times) and higher in July(4.6 times) and lowest in November(3.3 times). Fresh weight feces frome one defecation on the pasture were 1.177g in May, 840g in June, 1.418g in July and 1,271g in October, however the lowest values were recorded during the off grazing season(778g). Mounting interval of stallion was 33.8 minutes when the sallion was introduced to the breeding mares on the first week. However, the time was delayed to 260 minutes after one week of introduction of the stallion. The time spent for mounting, intermission and ejaculation of stallion was 26.9 seconds on the first day, and no difference were observed at the end of breeding season.