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Cluster-Based Mobile Sink Location Management Scheme for Solar-Powered Wireless Sensor Networks
Eomji Oh(오엄지),Minjae Kang(강민재),Ikjune Yoon(윤익준),Dong Kun Noh(노동건) 한국컴퓨터정보학회 2017 韓國컴퓨터情報學會論文誌 Vol.22 No.9
In this paper, we propose a sink-location management and data-routing scheme to effectively support the mobile sink in solar-powered WSN. Battery-based wireless sensor networks (WSNs) have a limited lifetime due to their limited energy, but solar energy-based WSNs can be supplied with energy periodically and can operate forever. On the other hand, introduction of mobile sink in WSNs can solve some energy unbalance problem between sink-neighboring nodes and outer nodes which is one of the major challenges in WSNs. However, there is a problem that additional energy should be consumed to notify each sensor node of the location of the randomly moving mobile sink. In the proposed scheme, one of the nodes that harvests enough energy in each cluster are selected as the cluster head, and the location information of the mobile sink is shared only among the cluster heads, thereby reducing the location management overhead. In addition, the overhead for setting the routing path can be removed by transferring data in the opposite direction to the path where the sink-position information is transferred among the heads. Lastly, the access node is introduced to transmit data to the sink more reliably when the sink moves frequently.
에너지 수집형 무선 센서 네트워크를 위한 에너지 적응형 데이터 압축 및 전송 범위 결정 기법
이준민,오엄지,노동건,윤익준,Yi, Jun Min,Oh, Eomji,Noh, Dong Kun,Yoon, Ikjune 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.4
Energy-harvesting nodes in wireless sensor networks(WSNs) can be exhausted due to a heavy workload even though they can harvest energy from their environment. On contrast, they can sometimes fully charged, thus waste the harvested energy due to the limited battery-capacity. In order to utilize the harvested energy efficiently, we introduce a selective data compression and transmission range control scheme for energy-harvesting nodes. In this scheme, if the residual energy of a node is expected to run over the battery capacity, the node spends the surplus energy to exploit the data compression or the transmission range expansion; these operations can reduce the burden of intermediate nodes at the expanse of its own energy. Otherwise, the node performs only basic operations such as sensing or transmitting so as to avoid its blackout time. Simulation result verifies that the proposed scheme gathers more data with fewer number of blackout nodes than other schemes by consuming energy efficiently.
이규민,오엄지,고세영,박정금,박덕환,김동혁,오창식,Lee, Gyu Min,Oh, Eom-Ji,Ko, Seyoung,Park, Jungkum,Park, Duck Hwan,Kim, Donghyuk,Oh, Chang-Sik The Microbiological Society of Korea 2018 미생물학회지 Vol.54 No.1
Erwinia pyrifoliae는 그람 음성 세균으로 사과와 배에 가지검은마름병을 일으킨다. E. pyrifoliae EpK1/15 균주가 병징을 보이는 경기도 포천지역의 사과나무 가지에서 2014년도에 분리되었다. 본 논문에서는 PacBio RS II 플랫폼을 이용하여 E. pyrifoliae EpK1/15 균주의 전체 유전체를 분석하여 보고한다. 본 균주는 G + C 비율이 53.4%이며, 4,027,225 bp로 구성된 염색체와 G + C 비율이 50.3%이며, 48,456 bp로 구성된 plasmid를 지니고 있다. 이들 염색체와 plasmid DNA에서 3,798개의 단백질 코딩 유전자, 22개의 rRNA, 77개의 tRNA, 13개의 non-coding RNA 및 231개의 위유전자(pseudo gene)가 확인되었다. Erwinia pyrifoliae is a Gram-negative bacterium causing black shoot blight in apple and Asian pear trees. E. pyrifoliae strain EpK1/15 was isolated in 2014 from an apple twig from the Pocheon, Gyeonggi-do, South Korea. In this study, we report the draft genome sequence of E. pyrifoliae EpK1/15 using PacBio RS II platform. The draft genome is comprised of a circular chromosome with 4,027,225 bp and 53.4% G + C content and a plasmid with 48,456 bp and 50.3% G + C content. The draft genome includes 3,798 protein-coding genes, 22 rRNA genes, 77 tRNA genes, 13 non-coding RNA genes, and 231 pseudo genes.
미끼식물을 이용한 화상병 감염 기주 매몰지 내 화상병균 제거 효율 검증및 병 재발 모니터링
박인웅,송유림,Nguyen Trung Vu,오엄지,황인선,함현희,김성환,박덕환,오창식 한국식물병리학회 2022 식물병연구 Vol.28 No.4
The fire blight caused by Erwinia amylovora (Ea) was first reported in 2015 in Korea, and the disease has rapidly spread to 22 regions until 2021. In Korea, all host plants in the apple and pear orchards where fire blight occurred should be eliminated and buried by the Plant Protection Act. To prevent the spread of the disease, all burial sites were prohibited from planting the new host plants for the next three years. To confirm the eradication efficiency of Ea and the reoccurrence of fire blight, the surveillance facilities were established on three burial sites from 2019 to 2020 in Anseong-si, Gyeonggi-do, and Chungju-si, Chungcheongbuk-do. As host plants, five apple trees of fire blight-susceptible cultivar ‘Fuji’, were planted in each facility. All facilities were enclosed with fences and nets and equipped with two CCTVs, motion sensors, and several other sensors for recording weather conditions to monitor the environment of the sentinel plants in real-time. The sentinel plants were checked for the reoccurrence of fire blight routinely. Suspicious plant parts were collected and analyzed for Ea detection by loop-mediated isothermal amplification polymerase chain reaction and conventional polymerase chain reaction. Until November 2022, Ea has not been detected in all sentinel plants. These results might support that the burial control of infected plants in soil works efficiently to remove Ea and support the possibility to shorten the prohibition period of host plant establishment in the burial sites.