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기내배양과 자연조건에서의 유자(Citrus junos Sieb. et Tanaka)의 부정배 발생의 특징
송원섭,진영욱,김동철,우 서 順天大學校 1997 論文集 Vol.16 No.1
유자(Citrus junos)의 부정배는 자연조건에서는 주심조직과 배낭근처에서 발생하였으며 부정배로 발육될 시원세포들은 매우 큰 핵과 세포질로 충만되어 있고 주로 배낭근처에 있는 주공측의 주심조직에서 발생되었다. 기내배양 조건에서는 자연조건에서 보다도 훨씬 많은 부정배들이 배낭내에서 관찰되었으며 이러한 부정배들은 대부분 배낭과 밀접해 있는 주심세포층으로부터 발생하였다. 또한 몇몇 부정배들은 주심조직에서 직접 발생하는 것이 관찰되었다. Adventive embryo usually occurs inside the embryos ac nucellar tissue in the in Vivo state. Initial cells to be developed in to adventive embryos were conspicuous with large nucleus and dense cytoplasm, and arose mainly from nucellar tissue or from integuments. In the in Vitro culture, much more embryos were observed in the embryo sac. than in the in Vivo conditions, and embryos seemed to arise from the nucellar cell layer lining the embryo sac. Some of the adventive embryos were observed occurring directly from the nucellar.
두개골의 3차원 영상 분석을 위한 전산화단층촬영 방법의 비교 : 상층 두께가 3차원 영상의 계측에 미치는 영향
정호걸,김기덕,박혁,김동욱,정해조,김희중,유선국,김용욱,박창서 대한구강악안면방사선학회 2004 Imaging Science in Dentistry Vol.34 No.3
Purpose : To evaluate the quantitative accuracy of three-dimensional (3D) images by means of comparing distance measurements on the 3D images with direct measurements of dry human skull according to slice thickness and scanning modes. Materials and Mathods : An observer directly measured the distance of 21 line items between 12 orthodontic landmarks on the skull surface using a digital vernier caliper and each was repeated five times. The dry human skull was scanned with a Helical CT with various slice thickness (3, 5, 7 mm) and acquisition modes (Conventional and Helical). The same observer measured corresponding distance of the same items on reconstructed 3D images with the internal program of V-works 4.0 (Cybermed Inc., Seoul, Korea). The quantitative accuracy of distance measurements were statistically evaluated with Wilcoxons’ two-sample test. Results : 11 line items in Conventional 3 mm, 8 in Helical 3mm, 11 in Conventional 5 mm, 10 in Helical 5 mm, 5 in Conventional 7 mm and 9 in Helical 7 mm showed no statistically significant difference. Average difference between direct measurements and measurements on 3D CT images was within 2 mm in 19 line items of Conventional 3 mm, 20 of Helical 3 mm, 15 of Conventional 5 mm, 18 of Helical 5 mm, 11 of Conventional 7mm and 16 of Helical 7 mm. Conclusion : Considering image quality and patient’s exposure time, scanning protocol of Helical 5 mm is recommended for 3D image analysis of the skull in CT.
XML 문서의 상향식 질의처리를 지원하는 효율적인 색인구조
서동민 ( Dong-min Seo ),김은재 ( Eun-jae Kim ),성동욱 ( Dong-ook Seong ),유재수 ( Jae-soo Yoo ),조기형 ( Ki-hyung Cho ) 한국인터넷정보학회 2006 인터넷정보학회논문지 Vol.7 No.4
XML에서의 질의는 경로 질의를 사용하고, 경로 질의를 효과적으로 처리하기 위한 여러 가지 색인 기법들이 연구되었다. 최근에는 구조 조인 기법과 더불어 접미사(suffix) 트리를 이용한 기법이 제안되고 있다. 그 중에서 가장 대표적인 기법이 ViST(Virtual Suffix Tree)이다. ViST는 질의 처리 시간을 줄이기 위해서 접미사 트리와 B+ 트리를 이용하여 질의 처리에 참여하는 엘리먼트만을 비교한다. 그러나 실제 문서에서 조상-후손 관계가 아닌 엘리먼트도 후손으로 보고 처리하는 문제점으로 인해 디스크 접근이 많아지는 비효율성을 지닌다. 따라서 본 논문에서는 ViST의 문제점을 해결하는 색인구조를 제안하고, 이 색인구조에 알맞은 질의 처리기법을 제안한다. 그리고 다양한 질의 처리 실험을 통해 기존에 제안된 색인구조에 비해 향상된 질의 처리 성능을 나타냄을 보인다. A path query is used in XML. Several index structures have been studied for processing the path query efficiently. In recent, the index schemes using suffix tree with structure join method were proposed. ViST is the most representative method among such methods. ViST processes the query using suffix tree and uses B+-tree to reduce the search time of the documents. However, it significantly degrades the search performance when processing the path query. The reason is that it regards the element that is not ancestor-descendant relation in the document as a descendent. In this paper, we propose an efficient index structure to solve the problem of ViST. The query processing method suitable to the index structure is also proposed. It is shown through various experiments that the proposed index structure outperforms the existing index structure in terms of the query processing time.
CO Oxidation of Catalytic Filters Consisting of Ni Nanoparticles on Carbon Fiber
Seo, Hyun-Ook,Nam, Jong-Won,Kim, Kwang-Dae,Kim, Young-Dok,Lim, Dong-Chan Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.4
Catalytic filters consisting of Ni nanoparticle and carbon fiber with different oxidation states of Ni (either metallic or oxidic) were prepared using a chemical vapor deposition process and various post-annealing steps. CO oxidation reactivity of each sample was evaluated using a batch type quartz reactor with a gas mixture of CO (500 mtorr) and $O_2$ (3 torr) at $300^{\circ}C$. Metallic and oxidic Ni showed almost the same CO oxidation reactivity. Moreover, the CO oxidation reactivity of metallic sample remained unchanged in the subsequently performed second reaction experiment. We suggested that metallic Ni transformed into oxidic state at the initial stage of the exposure to the reactant gas mixture, and Ni-oxide was catalytically active species. In addition, we found that CO oxidation reactivity of Ni-oxide surface was enhanced by increase in the $H_2O$ impurity in the reactor.
Real-World Experience of Long-Term Dupilumab Treatment for Atopic Dermatitis in Korea
( Dong Hun Lee ),( Hyun Chang Ko ),( Chan Ho Na ),( Joo Young Roh ),( Kui Young Park ),( Young Lip Park ),( Young Min Park ),( Chang Ook Park ),( Chun Wook Park ),( Youin Bae ),( Young-Joon Seo ),( Sa 대한피부과학회 2022 Annals of Dermatology Vol.34 No.2