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과산화수소 증기 시스템을 이용한 미생물 제독에 관한 연구
김윤기,김민철,윤성녀,황현철,류삼곤,Kim, Yun Ki,Kim, Min Cheol,Yoon, Sung Nyo,Hwang, Hyun Chul,Ryu, Sam Gon 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.3
Objectives: Effectiveness and conditions of vapor-phase hydrogen peroxide (VPHP) system on decontamination of Geobacillus stearothermophilus(GS) spores, Escherichia coli (E.coli) and Enterobacteria phage felix01 (felix01) were determined. Methods: The VPHP system was designed to vaporize 35% (w/w) solution of hydrogen peroxide, continuously to inject and withdraw VPHP. The system and VHP 1000ED (Steris) were operated such that dehumidification and conditioning were initiated without samples in the chamber. Then the samples were loaded into and removed. Coupons (glass, anodizing, silicon, viton) with GS spores ($1{\times}10^6$ colony forming unit/mL [CFU/mL]), E.coli ($1{\times}10^7$ CFU/mL) and felix01 ($1{\times}10^7$ plaque forming unit/mL[PFU/mL]), and Biological Indicator (BI) with GS spores ($1{\times}10^6$ CFU/mL) on stainless steel coupons were used. The tested samples were sonicated and vortexed, and then were plated for enumeration, followed by incubation at $55^{\circ}C$, 24 hr for GS spores, and at $37^{\circ}C$, 24 hr for E.coli and felix01. BI analysis in broth culture was only qualitative. Results: The efficacy of the VPHP system on decontamination was almost equivalent to that of VHP 1000ED. The conditions for complete decontamination with the VPHP system was as follows: concentration; 700~450 ppm, relative humidity; approximately 55%, and temperature; $34{\sim}32^{\circ}C$. When comparing the decontamination efficiency among different kinds of coupons, glass was the most effective, however, all kinds of coupons were decontaminated completely after 60 min exposure in both systems. Conclusion: The VPHP system can be recommended as an alternative system for traditional system using ethylene oxide, formaldehyde or chlorine dioxide.
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A Study on Identifying Key Players in a 3D Cadastre Citation Network
김윤기 한국지적학회 2018 한국지적학회지 Vol.34 No.1
The main purpose of this study was to identify key plays in a 3D cadastre citation network. To achieve the research objective, this article examined theories and previous studies on 3D cadastre and citation networks and set up two research questions based on them. To answer these research questions, this study attemted to search for 3D cadastre research published from January 1, 2012, to October 31, 2017, using Google Scholar Search. This study constructed a citation network using the citation information of the collected data and then used social network analysis techniques such as degree centrality, closeness centrality, and eigenvector centrality to identify the influential nodes. This study also used modularity-based Louvain algorithms to detect influential communities in the citation network. As a result of the analysis, Stoter et al. (2013) were identified as the most influential nodes in the whole network and community 0 was identified as the most important community.
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김윤기,kim, Yun-Ki LX Spatial Information Research Institute 2018 지적과 국토정보 Vol.48 No.1
본 연구의 주된 목적은 LDA를 이용하여 국제지적연구의 주제와 연구추세를 확인하는 것이었다. 이러한 연구목적을 달성하기 위해 나는 LDA와 국제지적연구에 관한 선행연구를 검토하였고 이를 기반으로 4 개의 연구 질문을 설정하였다. 이러한 연구 질문에 답을 구하기 위해 나는 FIG Peer Review Journal에 2008년 1월1일 부터 2017년 10월 31일 사이에 발표된 370편의 논문들을 LDA를 이용하여 분석하였다. 분석의 결과 나는 국제지적연구에 12개의 주요 주제가 존재하고 있음을 확인하였다. 그리고 이러한 주제 중에 가장 영향력 있는 주제는 topic 2 (지적정보시스템)로 확인되었으며 또한 topic 5 (토지개발과 토지행정)도 전체 문서에서 중요한 역할을 수행하고 있는 주제로 파악되었다. 이두 주제는 지난 10년 동안 추세선이 매우 활발하게 움직인 가장 인기 있는 주제들로서 앞으로의 지적연구에서도 주도적인 역할을 수행할 것이 틀림없다. The main purpose of this study was to identify the topics and research trends of international cadastral research using LDA. To achieve this goal, I reviewed the literature on LDA and international cadastral study and formulated four research questions that are topics of cadastral researchers, distribution of topics, the most influential topics and changes of topics over time. To answer these research questions, I analyzed 370 papers published in the FIG Peer Review Journal between January 1, 2008, and October 31, 2017, using LDA. As a result of the analysis, I confirmed that there are twelve major topics in international cadastral research. And the most influential topic of these topics was identified as topic 2(cadastral information systems), and topic 5(land development and land administration) was also confirmed as playing an important role in the overall document. These two topics have been the most popular topics whose trendlines have been very active over the past decade and will play a leading role in future cadastral research.
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김윤기,Kim, Yun-Gi 한국건강관리협회 1990 건강소식 Vol.14 No.1
교통수단의 발달과 해외여행 자유화 물결을 타고, 이제 세계의 나라들이 우리 생활과 성큼 가까워진 듯하다. 그러나 단순한 여행보다는 좀더 의미있고 경제적인 여행을 위해서는 여행지의 문화적 특성을 이해하는 것이 중요하다고 생각한다. 본지에서는 세계 각국의 문화적 특성을 1년간 연재하여, 독자들의 해외여행에 조금이나마 도움이 되고자 한다.
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NGN에서의 품질보장형 음성서비스 제공을 위한 대역 설계 방법
金潤基,이광휘,이훈 대한전자공학회 2003 電子工學會論文誌-TC (Telecommunications) Vol.40 No.12
In this paper we proposea method for estimating the bandwidth in next-generation IP network. Especially, we concentrate on the edge routers accommodating the VoIP connections as well as a group of data connections. Bandwidth dimensioning is carried out at call level and packet level for voice traffic in the next-generation IP network. The model incorporates the statistical estimation approach at a call level for obtaining the number of voice connections simultaneously in the active mode. The call level model incorporates a statistical technique to compute the statistics of the number of active connections such as the mean and variance of the simultaneously connected calls in the network. The packet level model represents a load map for voice and data traffic by using non-preemptive M/G/1 queuing model with strict priority for voice over data buffer. From the proposed traffic model, we can derive a graph for upper bounds on the traffic load in terms of bandwidth for voice and data connections. Via numerical experiments we illustrate the implication of the work. 본고는 차세대 IP망(NGN)에서의 대역 설계 방법에 관한 것이다. 특히, VoIP 뿐만 아니라 데이터 서비스를 수용하는 에지 라우터에서의 호레벨 및 패킷 레벨 음성 트래픽 대역 설계 방법을 제시하였다. 호레벨 모델은 실제 연결되는 호의 수를 통계적으로 계산하기 위해 평균, 분산과 같은 통계적 기법을 사용하고, 패킷레벨 모델은 M/G/1 큐잉 모델을 활용하여 음성 및 데이터 트래픽의 부하를 나타내었다. 제시된 트래픽 모델을 통해서 계산된, 음성과 데이터 연결을 위한 대역폭을 기반으로 최대 트래픽 부하를 예측할 수 있고, 또한 수치 시험을 통한 이의 결과를 제시하였다.
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X-선 회절법에 의한 철-질소 화합물층의 ε과 γ'상 분율 해석
김윤기,Kim, Yoon-Kee 한국재료학회 2006 한국재료학회지 Vol.16 No.2
The fraction of $\varepsilon\;and\;\gamma$'-iron nitride in compound layer is predicted by x-ray diffraction using direct comparison method. The validity of formulation models was checked by comparing calculated results with metallographic analysis of iron nitride compound layer grown on steel S45C by gas nitriding. The fraction of $\varepsilon$ calculated by the three phase model, porous-$Fe_3N$/ dense-$Fe_3N$/ mixed layer with $Fe_3N\;and\;Fe_4N$, is 80 percent of that analyzed by etching technique. The $\varepsilon$ fraction predicted by mixed layer model is 122 percent of that measured by microscope.
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