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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.
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
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.