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치주질환에 이환된 환자에서 구치 상실 치열 수복을 위한 임플란트 수복
이승원,김영수,Yi, Seung-Won,Kim, Young-Soo 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.1
Number of fixtures supporting prosthesis for rehabilitation of partial edentulism in distal area is an important factor in distal area to the bone tissue response around dental implant. Optimal number and optimal positioning of dental implant has leaded to the stable condition of bone tissue and successful long-term treatment outcome. This clinical and radiographic study was performed to document and evaluate the short-term result of occlusal rehabilitation by means of implant-supported fixed prostheses (ISPs) especially for partial edentulism in distal area in patients treated for advanced periodontal disease and to verify the number of fixture affecting the bone tissue response. A total of 30 consecutive patients referred because of advanced periodontal disease were included. Before the implant therapy was initiated, periodontal treatment was performed and the outcome evaluated during at least a 6-month period. An individual maintenance care program was designed for each patient. All 75 implants were placed using a 2-stage surgical approach. The patients were divided into 2 groups, in one of which two fixtures were placed and in the other of which three fixtures were placed with tripodal geometry. Following installation of the ISPs, all patients underwent a baseline examination including evaluation of i) oral hygiene, and ii) periodontal/ peri-implant conditions, and iii) radiographs. These examinations were repeated annually during the 1 or 2-year observation period. The results were as follows: 1.No single implant was lost during the observation follow-up period. 1.The percentage of plaque harboring surfaces and bleeding units upon probing were found to be low (<10%), and no soft tissue complications were recorded. 1.Two-fixture group showed bone destruction ranged from 0.0mm to 1.5mm and the mean was 0.31mm. Three-fixture group showed more bone destruction of 0.51mm. There was no statistically difference between two groups. These results suggested that the factor for success is not the number of fixture but the strict maintenance of peri-implant tissue health and initial stability of fixture.
이승원,이원호,김형준,Lee, Seung-Won,Yi, Waon-Ho,Kim, Hyung-Joon 한국전산구조공학회 2014 한국전산구조공학회논문집 Vol.27 No.6
일반적으로 지진취약도를 평가할 때 사용되는 해석방법 중 하나인 역량스펙트럼 방법은 증분동적해석에 비해 해석의 정확성이 떨어지는 제한점이 있다. 본 연구에서는 증분동적해석이 가장 정확도가 높은 해석기법이라는 점에 착안하여 증분동적해석을 이용한 지진취약도 곡선의 도출과정을 제안하였다. 타당성 비교를 위하여 역량스펙트럼 방법과 제안된 방법으로 도출한 취약도 곡선을 비교하여 두 해석기법에 의한 지진취약도 곡선의 경향을 분석하였다. 그 결과 Slight damage와 Moderate damage의 경우 두 해석방법이 유사한 곡선 경향을 보이나 Extensive damage와 Complete damage의 경우에는 IDA방법에 의한 곡선이 더 가파른 경향을 보였다. 이는 구조물의 거동을 이상화하여 극한점 이후 구조물의 저항 강도가 떨어지지 않는다고 가정하는 역량스펙트럼 방법의 영향을 받는 것으로 사료된다. Accuracy of seismic response evaluated by a capacity spectrum method (CSM) is generally known to be less than that by Incremental dynamic analysis (IDA). In this paper, a procedure for IDA based seismic fragility curves for steel moment resisting frames was suggested. This study compares seismic fragility curves using the suggested method (IDA method) with those using a CSM and intends to verify the validity of the IDA method. The shapes of both seismic fragility curves are similar in slight and moderate damage states. However, in the case of extensive and complete damage states, the fragility curves obtained from the IDA method presents a more steep slope due to less variation (or uncertainties). This is due to the fact that the IDA method can properly capture the structural response beyond yielding rather than the CSM.
왕우럭(Tresus keenae)에서 분리된 Bacillus species의 고분자 유기물질 분해능력과 항균활성
이승원 ( Seung-won Yi ),문성현 ( Sung-hyun Moon ),조호성 ( Ho-seong Cho ),김철원 ( Chul-won Kim ) 한국가축위생학회 2017 韓國家畜衛生學會誌 Vol.40 No.4
The production of enzymes that help digestion, assimilation of essential nutrients, and prevent pathogenic bacteria are important for probiotics used in aquaculture. The objective of this study was to investigate enzyme activities for macromolecular organic matters and antimicrobial properties of the selected potential probiotics isolated from gut of surf clam (Tresus keenae) against well-known shellfish- pathogenic bacteria. Among 65 isolates from guts of 60 surf clams, seven Bacillus strains with outstanding degradation capability of macromolecule organic matter were selected as potential probiotics as follows: TKI01 (B. vietnamensis), TKI02, TKI26 (B. thuringiensis), TKI14, TKI32, TKI42 (B. amyloliquefaciens), and TKI18 (B. stratosphericus). After in vitro antimicrobial activity test was performed against five shellfish-pathogenic bacteria including Listonella anguillarum, Vibrio parahaemolyticus, V. splendidus, V. harveyi, V. tubiashii, PCR assay was performed to detect bacteriocin-producing strain. PCR results revealed that the five Bacillus strains possessed diverse bacteriocin genes including ericinA, coagulin, surfactin, iturin, bacyllomicin, fengycin, bacylisin, subtilin, and lantibiotics. In the present study, the selected seven Bacillus strains showed different enzyme activities according to types of macromolecule organic matters. And their antimicrobial activities varied based on the species of pathogenic bacteria. In addition, at least five Bacillus strains had genetic potential to produce several natural lipopeptide antibiotics that may help biological control of surf clam aquaculture. Therefore, mixed use of probiotics might show co-operative effect and increase the efficiency of probiotics rather than separate use. To the best of our knowledge, it is the first report on antimicrobial properties of Bacillus species isolated from surf clam.
이스라엘 잉어( Cyprinus carpio)에서 Aeromonas veronii 감염증의 증례 phylogenetic analysis와 항생제 내성
이승원 ( Seung Won Yi ),유명조 ( Myung Jo You ),이해범 ( Hae Beom Lee ),신기욱 ( Gee Wook Shin ) 한국동물위생학회 2012 韓國家畜衛生學會誌 Vol.35 No.3
We reported an outbreak of Aeromonas (A.) veronii responsible for ulcerative dermatitis in Israeli carp (Cyprinus carpio). The major clinical signs were darkening body, abdominal extension, exophthalmos and severe ulcerative necrosis in the skin. The necropsy showed yellowish ascites, necrosis in liver and enlargement of kidney and spleen in the morbid fish. In blood agar for culturing bacteria, three different colonies were identified as A. veronii, Plesimonas shigelloides and Shewanella putrefaciens by phylogenetic identification using 16S rRNA or gyrB gene sequences. A. veronii was the most dominant species among them and was resistant to ampicillin, nalidixic acid and oxytetracycline.
새로운 압축기법을 이용한 Light Field 렌더링의 성능 향상
이승원(Seung-Won Yi),박상훈(Sanghun Park),임인성(Insung Ihm) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B
영상 기반 렌더링(image-based rendering)은 모델의 복잡한 정도나 요구되는 계산량에 관계없이 인터렉티브하게(interactively) 영상을 생성함으로써 기존의 다각형 기반 렌더링(polygon-based rendering)이 갖는 한계를 보완하기 위해 제안되었다. light field 렌더링[5]은 대표적인 영상 기반 렌더링 방법 중의 하나로, 다양한 위치에서 획득한 여러 가지 영상을 미리 만들어놓고 이들을 적절히 보간(interpolation)하여 새로운 영상을 빠르게 생성하도록 구현되었다. 하지만 이러한 장점에도 불구하고 전처리 과정에서 상당히 방대한 크기의 영상 데이터들이 생성되는 문제를 내포하고 있고, 이들 데이터에 대한 효과적인 처리가 중요한 문제로 대두되었다. light field 렌더링에서는 이 문제를 벡터 양자화(vector quantization)를 이용하여 해결하였는데, 이것은 빠른 랜덤 액세스(random access)와 비교적 높은 압축율이 요구되는 응용에 적합한 대표적인 압축 기법이다. 본 논문에서는 벡터 양자화보다 높은 압축율과 좋은 복원 화질을 지원하면서 빠른 랜덤 액세스가 가능한 인코딩 스킴(encoding scheme)을 제안하고, 이를 이용해 light field 랜더링의 성능을 향상시킬 수 있음을 보인다.