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구동환,정충일,정동관,남은숙 한국식품위생안전성학회 1995 한국식품위생안전성학회지 Vol.10 No.2
Highly lethal Listeria monocytogenes, causing bromatoxism through vegetables, dairy products, meat products and shellfish etc, was examined for possible contamination in market beef. USDA, FDA, Malthus and Modified Cold Enrichment methods were used for the detection of Listeria spp.. Samples of domestic and imported market beef were collected from local meat shops at Seoul, Korea. Total two hundreds and six of Listeria spp. were isolated and identified from beef samples. L. welshimeri was the most abundant Listeria species in market beef. Among 206 isolates, the number of L. welshimeri was one hundred and twenty-one(44.8%). The numbers of isolated L. innocua, L. murrayi, L. monocytogenes, L. grayi, L. seeligeri, and L. ivanovii were 49(18.1%), 14(5.2%), 12 (4.4%), 6(2.2%), 2(0.7%), and 2(0.7%), respectively. Detection rates of Listeria spp. varied among four methods. The highest detection rate of Listeria spp. in market beef was found at USDA method and that of L. monocytogenes was found at Malthus method.
탈지 환원유에서 Bifidobacterium longum의 호기성 고농도 배양에 관한 연구
구동환,하상우,조수현,박기문,김동운,강국희 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.1
The objectives of this study were to investigate the optimal condition for growth and highly concenterated culture of Bifidobacterium longum (Bif longum). The effects of additives were compared with titratable acidity and viable cell counts, and 10% reconstituted skim milk (no additive) was used as a control. Correlation coefficient for the growth of Bif. longun between CO_2 anaerobic jar method and overalaid medium method was R=0.99. When 1% Bif. longurn was inoculated on 12%, 14%, and 16% reconstituted skim-milk, viable cell counts were 8.60, 8.89, and 8.93 Log CFU/ml, respectively. When Lactose, Glucose, Glucosamine, Fructose, Peptone, N-acethyl-D-glucosamine, D-galactose, and liver extract were added to 16% reconstituted skim-milk, the viable cell counts were 8.61, 9.05, 9.15, 9.24, 8.82, 9.75, 9.17, and 9.64 Log CFU/ml, respectively. Therefore, D-galactose, liver extract, and N-acethyl-D-glucosamine were selected as final additives. When Bif longum was inoculated on Fermentor-I (16% reconstituted skim milk containing 0.1% yeast extract, 0.5% D-galactose and 0.5% liver extract), Fermentor-II (16% reconstituted skim milk containing 0.190% yeast extract, 0.590% N-acethyl-D-glucosamine and 0.5% liver extract), Batch culture-I (16% reconstituted skim milk containing 0.1% yeast extract, 0.5% D-galactose and 0.5% liver extract), and Batch culture-II (16% reconstituted skim milk containing 0.1% yeast extract, 0.5% N-acethyl-D-glucosamine and 0.5% liver extract), viable cell counts were 10.46, 9.37, 9.03, and 8.83 Log CFU/ml, respectively. Although liver extract was the important additive for the highly concentrated culture of Bif. longum in this study, it caused serious off-flavor when liver extract-1 (contained cell mass) was added to Fermentor culture. However, flavor was improved when liver extract-2 which was removed cell mass, was used instead of liver extract-1. Addition of 2% liver extract-II and 1% D-galactose had the similar effect with addition of 0.5% Liver extract-I and 0.5% D-galactose on the growth of Bif. longum.
구동환(Donghwan Ku),김현성(Hyunsung Kim) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
Internet of things (IoT) is a rapidly emerging paradigm in which physical objects integrate with the cyber world. This allows physical objects to operate over Internet. One key challenge is that most IoT objects have low energy level with minimal computation capabilities and thus require simple security solutions. Recently, Sharaf-Dabbagh et al. proposed a device authentication framework over IoT. The purpose of this paper is to review Sharaf-Dabbagh et al.‘s framework and withdraw the problems in it. They are synchronization requirement between IoT objects, overhead to clarify device fingerprints and error possibility to infer correct device fingerprints.
AI+X Playground 를 위한 클라우드-네이티브 기반 엣지 클러스터 구축
구동환(DongHwan Ku),최유라(Yura Choi),신준식(Jun-Sik Shin),김종원(JongWon Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 엣지 환경의 DevOps(개발운용병행체제) 기반 서비스 실증을 위한 AI+X Playground 테스트베드에서 영상데이터 융합 등의 AI 작업을 지원하기 위한 핵심 요소인 클라우드-네이티브 기반 엣지 클러스터를 다룬다. 시험적으로 구축한 엣지 클러스터를 통하여 대규모 데이터 처리가 요구되는 영상 기반의 지능형 AI+X 서비스를 수용할 수 있도록 노드당 50Gbps 수준의 초고속 네트워킹을 지원하며, 클라우드-네이티브 기반으로 다양한 워킹노드들의 자원 집합에 기반한 컨테이너를 활용한 유연한 MSA(Micro Services Architecture) 방식의 서비스 실증이 가능함을 확인한다.
오픈소스 소프트웨어를 이용한 클라우드-네이티브 엣지 클러스터의 가시성 지원 방안 설계
구동환(DongHwan Ku),김종원(JongWon Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문에서는 컴퓨팅/스토리지/네트워킹 자원을 통합적으로 제공하는 클라우드-네이티브(Cloud-native) 기반 엣지 클러스터의 자원 상태를 종합적으로 관제하는 데에 필요한 가시성 요구사항을 정리하고, 효율적인 가시성 지원 방안을 오픈소스 소프트웨어를 중심으로 설계한다. 대상으로 하는 가시성 데이터는 워크로드, 트래픽 흐름, 박스 자원의 세 가지 유형으로 구성되며, eBPF 를 비롯한 다양한 오픈소스 소프트웨어를 활용하여 각 유형별 가시성 데이터를 효율적으로 수집하도록 설계한다.