http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Newly recorded species of the genus Synura (Synurophyceae) from Korea
조복연,김한순 한국생태학회 2017 Journal of Ecology and Environment Vol.41 No.1
Background: Species in the heterokont genus Synura are colonial and have silica scales whose ultrastructural characteristics are used for classification. We examined the ultrastructure of silica scales and molecular data (nuclear SSU rDNA and LSU rDNA, and plastid rbcL sequences) to better understand the taxonomy and phylogeny within the section Petersenianae of genus Synura. In addition, we report the first finding of newly recorded Synura species from Korea. Results: We identified all species by examination of scale ultrastructure using scanning and transmission electron microscopy (SEM and TEM). Three newly recorded species from Korea, Synura americana, Synura conopea, and Synura truttae were described based on morphological characters, such as cell size, scale shape, scale size, keel shape, number of struts, distance between struts, degree of interconnections between struts, size of base plate pores, keel pores, base plate hole, and posterior rim. The scales of the newly recorded species, which belong to the section Petersenianae, have a well-developed keel and a characteristic number of struts on the base plate. We performed molecular phylogenetic analyses based on sequence data from three genes in 32 strains (including three outgroup species). The results provided strong statistical support that the section Petersenianae was monophyletic, and that all taxa within this section had well-developed keels and a defined number of struts on the base plate. Conclusions: The phylogenetic tree based on sequence data of three genes was congruent with the data on scale ultrastructure. The resulting phylogenetic tree strongly supported the existence of the section Petersenianae. In addition, we propose newly recorded Synura species from Korea based on phylogenetic analyses and morphological characters: S. americana, S. conopea, and S. truttae.
ViVa: 클라우드 오프로딩 기반의 모바일 영상 품질 향상
조복연,서덕영 한국방송∙미디어공학회 2019 방송공학회논문지 Vol.24 No.2
본 논문에서는 클라우드 서버와 영상 품질 향상 알고리즘을 이용하여 고화질의 영상을 서비스하는 방법을 소개한다. 즉, 논문에서 제안하는 ViVa (Video Value Addition)의 개념을 바탕으로 저화질 영상을 서비스하는데 필요한 전송 비트레이트와 계산량으로 고화질의 영상을 서비스함으로써 기존 스트리밍 서비스 대비 향상된 시스템을 제안한다.
LTE에서 클라우드 컴퓨팅을 이용한 모바일 에너지 효율 연구
조복연(Bokyun Jo),서덕영(Doug Young Suh) 한국방송·미디어공학회 2014 방송공학회논문지 Vol.19 No.1
This study investigates computing offloading effect of cloud in real-time video personal broadcast service, whose server is mobile device. Mobile device does not have enough computing resource for encoding video. The computing burden is offloaded to cloud, which has abundant resources in terms of computing, power, and storage compared to mobile device. By reducing computing burden, computation energy can be saved while transmission data amount increases because of decreasing compression efficiency. This study shows that the optimal operation point can be found adaptively to time-varying LTE communication condition result of tradeoff analysis between offloaded computation burden and increase in amount of transmitted data.
비디오 스트리밍 서비스를 위한 MMT 기반 적응적 QoS 연구
조복연(Bokyun Jo),이두현(Doohyun Lee),서덕영(Doug Young Suh) 한국방송·미디어공학회 2015 방송공학회논문지 Vol.20 No.1
This paper discusses QoS enhancement in the Best-effort services of the service plan provided by MPEG Media Transport (MMT) systems for video streaming applications. Among MMT services, i.e. per-flow, per-class, and best-effort services, the server does not provide guaranteed bandwidth for the best-effort service only. Therefore, in the best-effort services, a bandwidth access priority is defined for various services, where the lowest priority is assigned to the low-level video services. To alleviate the issue of bandwidth limitation in the best-effort services, this paper investigates transmission of low-resolution video with low bitrate and up-sampling. Our experimental results prove the superiority of the proposed method in terms of delivered video quality.