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글로벌연구망을 위한 효율적인 커뮤니티 라우팅 정책의 분석 및 설계
장현희 ( Hyun-hee Jang ),박재복 ( Jae-bok Park ),고광신 ( Kwang-shin Koh ),김승해 ( Seung-hae Kim ),조기환 ( Gi-hwan Cho ) 한국인터넷정보학회 2009 인터넷정보학회논문지 Vol.10 No.5
BGP 커뮤니티 기반의 라우팅 정책은 특정 네트워크에 대한 경로를 사용자 정의 라우팅 정책에 따라 선택할 수 있는 특성을 갖는다. 다양한 속성의 단위 네트워크가 상호 연결된 글로벌연구망 환경의 전체적인 성능향상을 위해 최근 커뮤니티 기반의 라우팅 정책에 대한 관심이 증대하고 있다. 본 논문은 기존 글로벌연구망에서 적용되고 있는 커뮤니티 라우팅을 전체 네트워크 성능향상의 관점에서 분석하고, 새로운 글로벌연구망에서 라우팅 성능에 관련된 문제점을 도출한다. 이를 바탕으로 새로운 글로벌연구망의 라우팅 경로상의 잘못된 경유 트래픽 개선, 비대칭 라우팅 등을 해결하는 네트워크 상호연동 구조와 최적의 커뮤니티 라우팅 정책 모델을 제시한다. 제시된 결과는 향후 개발될 국가연구망과 상업망의 성능향상에 크게 기여할 수 있을 것으로 기대된다. A routing policy based on BGP community routing permits to select a specific route for particular network by making use of user-defined routing policies. Especially, community based routing policy is recently getting a great concern to enhance overall performance in the global research networks which are generally inter-connected large number of different characterized networks. In this paper, we analyze the community routing which has been applied in existing global research networks in the network performance point of view, and catch hold of problems caused by the routing performance in a new global research network. Then, we suggest an effective community routing policy model along with an interconnection architecture of research networks, in order to make correct some wrong routings and resolve an asymmetric routing problem, for a new global research network. Our work is expected to be utilized as an enabling base technology to improve the network performance of future global research networks as well as commercial networks.
인간소변으로부터 생산된 MAP struvite 중 잔류미량의약물질 분석
장현희 ( Hyun Hee Jang ),서영민 ( Youngmin Seo ),전준호 ( Junho Jeon ),서규태 ( Gyutae Seo ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.6
This study is intended on production of MAP struvite from human urine and analysis of residual pharmaceuticals in the produced struvite. Experiments were conducted using hydrolyzed human urine and RO concentrate as magnesium source for MAP precipitation. An integrated single reactor was operated for MAP struvite precipitation at pH 9 although the optimum reaction pH was 10. There was not significant difference in the MAP production between pH 9 (2.08g MAP/L urine) and 10 (2.19g MAP/L urine). Pretreatment of the samples using Solid-Phase Extraction (SPE) was carried out for the pharmaceutical analysis in the MAP struvite and supernatant followed by LC/MS/MS for quantitative analysis. The result of analysis illustrated that 0.06 ㎍/g MAP to 6.22 ㎍/g MAP of pharmaceuticals are adsorbed on precipitated MAP struvite which may create a number of negative effects to environment if directly applied in agricultural purposes. The result of this study suggests that, to increase the applicability of MAP struvite precipitated using human urine, pretreatment of urine for pharmaceutical pollutants removal is needed.