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Performance evaluation using reduced neighbor lists in cellular based multi-hop relay network
Hun-je Yeon,Eunhyun Kwon,Sung-gook Lim,Jaiyong Lee,Mi-Sun Do,Rakesh Taori 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we introduce neighbor list composition scheme that organizes small numbers of adjacent neighbors for cellular based multi-hop relay network so that the neighbor advertisement with small number of neighbors could increase average transmission rate of MR network. Wireless multi-hop environment based on cellular system, such as 802.16j, requires an algorithm that organizes neighbor lists dynamically due to the mobility and impermanancy of relay station. From the study, we’ve concluded that the location based neighbor lists composition could reduces the wastage of wireless resources, which improves the transmission rate of cellular based wireless multi-hop network.
연구보문 : 자연과학 ; 새만금간척지에서의 녹비작물 재배 및 시용이 토양이화학성에 미치는 영향
강종국 ( Jong Gook Kang ),이상훈 ( Sang Hun Lee ),이경보 ( Kyeong Bo Lee ),이경도 ( Kyung Do Lee ),길근환 ( Geun Hwan Gil ),류진희 ( Jin Hee Ryu ),박기훈 ( Ki Hun Park ),이수환 ( Su Hwan Lee ),배희수 ( Hee Soo Bae ),황선아 ( Seon 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.1
새로 조성된 간척농지의 토양개량을 위하여 새 만금간척지에서 2007년부터 2011년까지 4년 동안 녹비작물 (여름철: 세스바니아, 제주재래피, 수수×수단그라스, 겨울철: 귀리, 호밀, 보리) 재배 및 시용이 토양이화학성에 미치는 영향을 조사하여 얻은 결과는 다음과 같다. 1. 녹비작물의 바이오매스 생산량은 평균 9.7 ~ 15.0 ton/ha이었으며, 이 중에서 수수×수단그라스의 생산량이 가장 많았다. 2. 녹비작물의 재배와 시용으로 토양유기물 함량이 1.3에서 6.0 g/kg로 매년 평균 1.2 g/kg씩 증가하였다. 3. 녹비작물의 재배와 토양환원에 의해 토양의 용적밀도가 1.44에서 1.24Mg/m3로 감소하였다. 4. 수수×수단그라스와 호밀의 이어짓기가 토양 용적밀도 감소에 가장 효과적이었고, 세스바니아 재배는 토양 질소함량 증가에 가장 효율적이었다. 이상의 결과로 미루어 볼 때 간척지에서의 녹비작물 재배 및 시용은 토양의 비옥도 요인을 일부 개선시킴으로써 간척농지 개량에 기여할 수 있을 것으로 기대된다. 앞으로 신간척지에서의 유기물과 관련된 다각적인 연구가 필요할 것으로 생각 된다. This study was conducted to investigate the effect of green manure crops on soil fertility and to provide informations for optimum cropping systems in Saemangeum reclaimed tidal land. Field trial was established with summer [sesbania (Sesbania sesban), wild millet (Echinochloa crus-galli), and sorghum-sudangrass hybrid (Sorghum bicolor)] and winter [oat (Avena sativa L.), rye (Secale cereale L.), and barley (Hordeum vulgare L.)] green manure crops at Saemangeum reclaimed tidal land in Korea from 2007 to 2011. Biomass of the green manure crops were 9.7-15.0 ton/ha (dry weight), and sorghumsudangrass hybrid produced consistently greater biomass than other crops across growing years. Cultivation and application of green manure crops increased soil organic matter contents from 1.3 to 6.0 g/kg by 1.2 g/kg per year. Green manure crops also improved bulk density from 1.44 to 1.24 Mg/m3 by addition of biomass residues. Sequential cultivation of sorghum-sudangrass hybrid followed by rye was most effective on decreasing bulk density of soil, and sesbania cultivation was most efficient on increasing soil nitrogen content. Overall, green manure crops can be probably useful for improvement soil fertility in Saemangeum reclaimed tidal land.
Kim Joo-Young,Gook Do-Hun,정민형,이두형 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
Riptortus pedestris (Hemiptera: Alydidae) is an important agricultural pest acquiring symbiotic bacteria from soil in every generation. Thus, soil microbiota could directly affect the symbiotic bacterial community structures of R. pedestris. In this study, we investigated the symbiotic bacterial communities in R. pedestris across multiple seasons and regions in South Korea. Foraging R. pedestris adults were collected using pheromone traps from three distinct generations in 2022; visual inspection was employed to locate overwintering adults in 2022 and 2023. In foraging R. pedestris, a total of 26 bacterial genera were detected from the insect midguts. Among them, 16 bacterial genera have not been previously documented for their symbiotic associations with R. pedestris. Genus Caballeronia was the most dominant, accounting for 46.2% of the bacteria detection frequency across the foraging generations, followed by genus Yokenella. The number of symbiotic bacterial genera showed seasonal variations, yielding 10, 18, and 15 genera in overwintered, first, and second generations, respectively. A majority of R. pedestris in the overwintered generation harbored a single bacterial genus. However, this pattern was not the case especially in the first generation, from which 57.1% of R. pedestris harbored multiple bacterial genera. Geographically, Caballeronia was also the most dominant across the six sampling sites. However, the dominance of Caballeronia was substantially lower in Jeju Island than the mainland sites, and five genera were exclusively found in the island. From overwintering R. pedestris, five bacterial genera were detected with the dominance of Caballeronia with two genera exclusively found in the overwintering populations.