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김원용,김명호,이윤준(Won Yong Kim),Myoung Ho Kim,Yoon Joon Lee 한국정보과학회 1998 정보과학회논문지(B) Vol.25 No.12
일반적으로 자동 색인 기능을 가진 정보 검색 시스템들의 가장 큰 문제들 중의 하나는 같은 개념을 표현하는 문서들 및 질의들의 서로 다른 색인어들에 의하여 표현되는 어휘 차이이다. 기존의 확률 검색 모델은 이러한 문제를 고려하지 않고 하나의 개념은 하나의 색인어에 의해서만 표현되는 환경을 가정한다. 본 논문에서는 기존의 확률 검색 모델을 색인어들간의 관계를 고려할 수 있도록 확장한다. 또한 확장된 모델이 필요로 하는 지식, 즉 색인어들간의 관계를 점진적으로 파악할 수 있는 방법을 제안한다. 이 방법은 질의에 대한 검색 결과가 나올 때마다 질의에 적합한 문서들에서 질의에 사용된 색인어들의 유사 색인어들을 파악하고 유사 정도를 갱신한다. 제안한 방법이 정보 검색 분야에서 잘 알려진 적합성 피드백처럼 사요아가 제공하는 적합성 정보를 이용하지만 그 목적은 다르다. 적합성 피드백은 과거의 질의들에 대한 적합성 정보를 현재와 미래의 질의들에 대한 검색 효율의 향상을 이하여 이용하지 않는다. 제안한 방법은 과거의 적합성 정보를 지식을 생성하는데 이용함으로써 현재와 미래 질의들의 검색 효율을 향상시킬 수 있다. 실험에 의하면 제안한 지식 생성 방법을 이용한 검색 모델이 기존의 확률 검색 모델보다 우수한 검색 효율을 보이고 있다. Most information retrieval systems with automatic indexing facility suffer from problems associated with the vocabulary gap that might exist between authors and users. This problem occurs because a concept, in practice, can be designated by many index terms. The conventional probabilistic retrieval model is for the environment in which a concept is represented by only one index term. In this paper the conventional probabilistic retrieval model is extended to incorporate analogue relationships of index terms. Analogue index terms can designate the same concept. We also propose an incremental learning method to figure out the relationships. Each time retrieval results become available, the learning method identifies in the documents relevant to the given query the index terms that designate the concepts specified by the query index terms. Although the learning method employs user feedback like relevance feedback well-known in information retrieval, it differs from relevance feedback in a sense that it attempts to catch certain stable relationships of index terms from past user queries rather than to distinguish relevant documents from non-relevant ones for a particular query. Through experiments, we show that the proposed information retrieval method outperforms the conventional probabilistic retrieval model.
국내에서 분리한 encephalomyocarditis virus의 성상
김원용,마점술,김철중,강신영,최재윤,하용공,Kim, Won-yong,Mah, Jum-sool,Kim, Chul-joong,Kang, Shien-young,Choi, Jae-yoon,Ha, Yong-kong 대한수의학회 1992 大韓獸醫學會誌 Vol.32 No.4
We have investigated the characteristics of encephalomyocarditis(EMC) virus isolated in Korea. The CPE, buoyant density, polypeptide profile and the size of RNA of EMC virus were examined. The granulation, pyknosis and necrosis were observed from 30 to 48 hour's post inoculation of the virus into baby hamster kidney and lung cells. The buoyant density was 1.30 and $1.35g/m{\ell}$. Three different polypeptides, 26Kd, 32Kd, and 34Kd in size, were observed and the size of viral RNA was 7.7Kb.
Polymerization chain reaction과 Southern hybridization을 이용한 Salmonella속 균의 신속한 검출
김원용,장영효,박경윤,김철중,신광순,박용하,Kim, Won-yong,Chang, Young-hyo,Park, Kyoung-yoon,Kim, Chul-joong,Shin, Kwang-soon,Park, Yong-ha 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.3
Salmonella species are the most prevalent etiologic agents of food-borne acute gastroenteritis. Direct isolation of bacteria from the contaminated food, stool and animal tissues has been used for the diagnosis of salmonellosis routinely. However, isolation of bacteria is time consuming work and not so highly sensitive. In recent years, improved methods of polymerization chain reaction(PCR) and probe hybridization technique have led to the developement of diagnostic assays which employ to detect various human and animal pathogenic bacteria. In this study, we have performed the polymerization chain reaction to detect Salmonella pullorum from tissues and stool samples of chickens with two specific primers, ST5 and ST8C. The target DNA fragment of PhoE gene was successfully amplified from liver, spleen, pancreas, heart, lung, ovary, oviduct and feces samples. The amplified DNA fragments were hybridized with Salmonella typhymurium TA3000 PhoE probe by Southern hybridization. The PCR to amplify the PhoE gene was highly rapid and sensitive method to detect Salmonella pullorum from tissues and stool samples.
가금에서 분리한 Salmonella속 균의 항균물질에 대한 감수성 및 plasmid profile
김원용,장영효,박경윤,김철중,신광순,박용하,Kim, Won-yong,Chang, Young-hyo,Park, Kyoung-yoon,Kim, Chul-joong,Shin, Kwang-soon,Park, Yong-ha 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.3
In this study, we aim to find the presence of virulence-related plasmid in Salmonella isolates from poultry, and the difference between S pullorum and S gallinarum on the plasmid profile and antibiotics resistance. We used seventeen isolates of Salmonella spp that were isolated from poultry. Thirteen isolates, S typhimurium(ST), S pullorum(SP) and S gallinarum(SG), contained virulence-related plasmids. These are 95Kd plasmid in ST and 85Kd plasmid in SP and SG. Three(1/4 of ST, 1/1 of SE, and 1/9 of SP) isolates have no detectable plasmids. The isolates of ST have relatively variable plasmid profile but the isolates of S pullorum except No 12(additional 3.0Kb plasmid) have common 85K6, 8.1Kb, 4.0Kb and 2.3Kb plasmid and two of three isolates of S gallinarum have common 85Kb, 4.0Kb and 2.3Kb plasmid but the rest has only 85Kb plasmid. Interestingly, all of the isolates of SP have 8.1Kb plasmid, and same size of plasmid is also found in one of ST isolates. All of the isolates have the resistance to penicillin, chloramphenicol, rifampicin, streptomycin, sulfamethazine and some isolates show the resistance to ampicillin and tetracycline. There is no relatedness between plasmid profile and antibiotics resistance and no differences between SP and SG in antibiotics resistance. Therefore further differentiation of each isolates by restriction enzyme assay and, if possible, charaterization of each plasmid, especially, 8.1Kb plasmid in SP and ST, may be necessary.