특이혈청항체 IgG 분획(分劃)이 Streptococcus mutans의 평골면(平滑面) 부착(附着)에 미치는 영향에 관한 연구

김찬수,하윤문,이진용,최유진 대한미생물학회 1982 大韓微生物學會誌 Vol.17 No.1

In order to demonstrate the effect of specific serum IgG antibody on the adherence of Streploco- zcus witarrs to smooth surface and the mechanism of effective adherince inbibition by IgG antibody, in the prepent study authors obtained purified 1'gG from different immunogen preparatiohs of S. mufans KCTC I04.49 (serotype c) and observed the effect of each IgG preparation on the adherence of each,S, virstans strain cultured in different conditions. In additiov, the presen( study was under- taken to observe the cross-reactivity of IgG and the eftect of sucrose concentration on the adherence of S. )eutpns in vitro non-growth conditian. The adherence of S. mutans to glass surface was effective]y inhibitecl by serum IgG antibody. At the same IgG concentrations, anti-2Fo fructose grown/1 N NaC1 washedI S. mutans NCTC lp449 cell showed greater a'dherence inJubitory effect to S. mutans strains .than anti 2Zo sccrose grown- .and anti-S. ruutans NCTC 10449 cell wall, and the greater inhibitory effects of Ig6 preparations were observed ia assay using 2z fructose grown S. mutans celI preparations tban using 0. Ip; uarose grown cell preparations. These results suggest that the more effective adherenee inhibition by serum IgG antibody is due to the reaciion with S. mutans cell surface antigens rather $lt;bpn glucan and celI-associated gIucosyltransferase. The greatest adherence inhibitory effeci. Of IgG to S. mulans strains was observed on homologous NCTC 10449 strain ancl the inhibition crogs-reactivities were observed betweein serotype c, e, and f strains. More pronounced cross-reactivity of adherence mhibition oI IgG to S. mutans vas observed in assay using anti-Zi fructose grown/I N XaCl wasbcd cell than using other IgG preparations, and observed in assay usmg 2.$quot;o fructose grosvn S. mutar:s cell preparations thRA'. 0, I a sucrose grown cef.l preparations. It was ir!terested that low, but adequa$lt;e concentration of reactive Igg antibody significantly increased the adherence ability of S, mgtaggg, This result may be due to the formation of srnall cell aggregates resulfed in a iaereage in tJ:e numbers af organisms whieh adhered to glass surface. The adherence of S. mutans to glass surface was possible in the a$sence of gluean-synthotie activity. Low level of sucrose sigdifkaetl increased the. Adherence ability vf S. mutans to glass surface, but excessive amount of suerose indueed Jarge cell aggr,egates reeulted in a decrease in the,aumbers of orgaaism which adbered.

재충전이 가능한 LiMn2O4 전지시스템에서 Lipon 박막 고체 전해질의 전기화학적 특성 분석

김찬수,주승기,김주석 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.5

In order to investigate the origin of capacity fading with charge/discharge cycling in LiMn₂O₄ thin film battery, impedance studies have been performed as function of cycling in Li₂MnO₄/Lipon/1M LiClO₄/Li cells using the Lipon layer as blocking electrolyte for Mn dissolution into liquid electrolyte. The fitted values obtained from impedance analysis shows good agreements with the experimental results. The Warburg resistance of LiMn₂O₄ steadily increase with increasing the charge/discharge cycles, which can explain that capacity fading of LiMn₂O₄ thin film by cycling originated from the structural instability of LiMn₂O₄ due to Jahn-Teller distortion.

한국형 미니트램 차량시스템 개발

김찬수,이광섭,정락교,강석원 대한전기학회 2015 전기의 세계 Vol.64 No.9

벡터적응필터를 이용한 컬러 역하프토닝

김찬수(Chansu Kim),김용훈(Yonghun Kim),이태홍(Taihong Yi) 한국정보과학회 2008 정보과학회논문지 : 소프트웨어 및 응용 Vol.35 No.3

본 논문은 컬러 역하프토닝에서 참조표에 기반을 둔 벡터적응필터 방법을 제안한다. 역하프토닝은 하프톤영상을 연속계조 영상으로 변환한다. 참조표를 사용하는 방법에는 템플레이트와 학습영상이 필요하며 샘플 하프톤영상과 원영상내의 분포된 패턴으로부터 참조표를 구할 수 있다. 일반적으로 참조표에 기반한 방법들이 다른 방법에 비하여 처리가 빠르며 PSNR면에서도 더 좋은 성능을 보이지만 처리과정에서 참조표에 존재하지 않는 패턴을 어떻게 처리 하느냐에 따라서 많은 품질의 변화를 보인다. 이 논문에서는 이와 같이 존재하지 않는 패턴을 보상하기 위하여 벡터적응필터를 제안 하였는데, 이 방법은 처리하는 픽셀의 주변 화소의 색상, 색농도, 밝기 등의 정보를 이용함으로써 컬러 역하프토닝에서 더 좋은 품질을 얻을 수 있다. 제안된 벡터적응 필터 방법이 기존의 최량선형추정에 의한 방법보다 PSNR면에서 더 좋은 결과를 얻을 수 있음을 실험결과에서 알 수 있었다. 참조표의 템플레이트 크기가 커질수록 제안한 방법이 더 좋은 결과를 얻을 수 있다. Abstract A look-up table based vector adaptive filter is proposed in color inverse halftoning. Inverse halftoning converts halftone image into a continuous-tone image. The templates and training images are required in the process of look-up table based methods, which can be obtained from distributed patterns in the sample halftone images and their original images. Although the look-up table based methods usually are faster and show better performances in PSNR than other methods do, they show wide range of qualities depending on how they treat nonexisting patterns in the look-up table. In this paper, a vector adaptive filter is proposed to compensate for these nonexisting patterns, which achieves better quality owing to the contributed informations about hue, saturation, and intensity of surrounding pixels. The experimental results showed that the proposed method resulted in higher PSNR than that of conventional Best Linear Estimation method. The bigger the size of the template in the look-up table becomes, the more outstanding quality in the proposed method can be obtained.

제주도 식물학분야 연구 성과와 과제

김찬수 제주학회 2018 제주학회 학술발표논문집 Vol.2018 No.1

제주도 범섬의 식물상

김찬수(Chan-Soo Kim),송관필(Gwan-Pil Song),문명옥(Myong-Ok Moon),송국만(Kuk-Man Song),김진(Jin Kim),이은주(Eun-Ju Lee) 한국자원식물학회 2005 한국자원식물학회지 Vol.18 No.2

본 조사는 식물상을 밝힘으로서 체계적이고 효율적인 보존관리대책을 마련하데 필요한 정보를 제공하고 우리나라 최남단에 속하는 도서에 있어서 식물자원의 분포특성을 파악하고자 수행하였다. 관속식물은 65과 140속 162종 2변종으로 총 164분류군이었는데 그 중 양치식물은 6과 13속 15종, 나자식물은 1과 1속 1종, 피자식물에 있어서는 쌍자엽식물이 49과 97속 114종 1변종으로 115분류군, 단자엽식물은 10과 29속 32종 1변종으로 33분류군이 출현하여 계 59과 126속 146종 2변종으로 계 148종이었다. 미기록 종은 양치식물 중 점고사리, 쇠고비, 큰족제비고사리, 사다리고사리 등 4종, 단자엽식물 중 강아지풀, 줄, 송이고랭이, 꽃토란, 개구리밥, 부채마 등 6종, 쌍자엽식물 중 큰사방오리, 개모시풀, 애기싱아, 미국자리공, 갯장구채, 새머루, 누리장나무, 보리장나무. 진득찰 등 9종 총 16과 19속 19종이었다. 희귀식물로서는 국내 거문도와 제주도에만 분포하는 것으로 알려진 박달목서가 자생하고 있으며, 바위연꽃의 자생지도 확인되었다. 또한 귀화식물은 총 20과 33속 34종 1변종으로 총 35분류군이었다. This study was conducted to prepare systematic and efficient measures for nature conservation and management in Beomseom Island, and to clarify characteristics of distribution of plant resources in southernmost islands of Korean peninsula. The numbers of vascular plants were summarized as 164 taxa included 6 families, 13 genera, and 15 species in pteridophyta, 1 family, 1 genus, and 1 species in coniferophyta, and 59 families, 126 genera, 146 species, and 2 varieties in endospermae composed of 49 families, 97 genera, 114 species, and 1 variety in dicotyledonae and 10 families, 29 genera, 32 species, and 1 variety monocotyledonae. Unrecorded taxa of the flora of Beomseom Island were 19 taxa included 4 taxa of pteridophyta, i.e. Hypolepis punctata, Cyrtomium fortunei, Dryopteris pacifica, and Thelypteris granduligera, 6 taxa of monocotyledonae, i.e. Setaria viridis, Zizania latifolia, Scirpus triangulatus, Zantedeschia aethiopica, Spirodela polyrhiza, and Dioscorea nipponica, and 9 taxa of dicotyledonae, i.e. Alnus firma, Boehmeria Platanifolia, Aconogonum ajanense, Phytolacca americana, Melandryum oldhamianum var. roseum, Vitis flexuosa, Clerodendron trichotomum, Elaeagnus glabra, and Siegesbeckia glabrescens. The two rare species, Osmanthus insularis that distributed only Jeju-do and Geomoondo Island and Orostachys iwarenge that distributed only southern parts of Jeju-do in Korea were investigated. The numbers of naturalized plants were 20 families, 33 genera, 34 species, and 1 variety.

실시간 해칭 렌더링에서 그림자 기법

김찬수(Kim Chan-Soo),김대명(Kim Dae-Myung) 한국콘텐츠학회 2006 한국콘텐츠학회 종합학술대회 논문집 Vol.4 No.2

컴퓨터 그래픽스의 연구는 크게 사실적 렌더링 분야와 비사실적 렌더링 분야로 나눌 수 있다. 사실적 렌더링과 달리 비사실적 렌더링은 만화, 수채화, 해칭과 같은 사람이 손으로 표현한 것 같은 분위기와 특징을 갖는 영상을 표현해 보자는데 그 목적이 있다고 할 수 있다. 본 연구에서는 비사실적 렌더링 기법의 하나인 실시간 해칭 렌더링기법과 사실적 렌더링기법인 그림자 기법을 통합하여 실시간 해칭 렌더링에서 그림자를 생성하기 위한 방법을 모색하였다. 그림자 기법에는 투영 텍스쳐 그림자 기법을 이용한 그림자 기법을 해칭 렌더링에 적용하여 해칭 렌더링에서 실시간 해칭 그림자를 생성하기 위한 기법을 제시한다. The research of computer graphics is divided into two parts of photorealistic rendering and non-photorealistic rendering. The purpose of non-photo realistic rendering is to make image like cartoon, water-color, hatching etc. In this paper, we study for real-time hatching rendering and shadow techniques and we combine two techniques to make real-time hatching shadow. In shadow techniques we apply projected texture shadow to hatching rendering. Eventually, we introduce natural real-time hatching shadow through comparison and analysis.

Vascular Plant Diversity of Jeju Island, Korea

김찬수 한국자원식물학회 2009 한국자원식물학회지 Vol.22 No.6

The vascular plants in Jeju composed of 21 families 62 genera, 190 species, 7 varieties with 197 taxa in Pteridophyta, 3 families 5 genera, 7 species, 3 forma with 10 taxa in gymnosperm (Coniferophyta) and 143 families 703 genera, 1,622 species, 114 varieties and 47 forma with 1,783 taxa in Endospermae. The total number of taxa was 1,990 consisting 167 families, 770 genera, 1,818 species, 121 varieties and 50 forma. Three families, 4 genera 4 species and 1 variety in Pteridophyta and 1 family, 1 genus I species, 1 forma of Coniferophyta were endemic to Jeju. Five families, 8 genera and 8 species in the Monocotyledonae of Endospermae and 23 families, 32 genera, 21 species, 16 varieties and 7 forma and 44 taxa in Cholipetalae, and 9 families, 24 genera, 12 species, 13 varieties and 7 forma, total 32 taxa in Sympetalae were endemic to Jeju. Total 90 taxa with 41 families, 69 genera, 46 species, 29 varieties and 15 forma were drawn up as endemic plants in Jeju. As the numbers show on, Jeju has more biodiversity especially plant diversity than any other places in Korea. It was an important region in regard to geographical position. The rarity on plants from Jeju has been assessed based on the IUCN red list categories and criteria at both regional and global levels. There was one species in each extinct (EX) and extinct in the Wild (EW). The EX and EW species were Rhododendron saisiuense Nakai (Ericaceae) and Asplenium antiquum Makino (Aspleniaceae), respectively. Three taxa, Rhododendron dauricum L. (Ericaceae), Lycopodium sieboldii Miq., and Lycopodiella cernua (L.) Serm (Lycopodiaceae) were species that is extinct in the region (RE). Sixty-one taxa were critically endangered (CR), 13 were endangered (EN), and 83 were vulnerable (VU) at regional level. The taxa listed on a Red List corresponds 26.9% of total taxa in Jeju. At global level, there were 19 taxa in CR, 4 in EN, and 1 in VU (Vulnerable) as the category of threat. The rest taxa (133 taxa) were classified as Least Concern (LC). According to the results of the assessment, conservation measures must be taken for total of 157 species that were categorized in threaten including one of EX, one of EW and three extinct in the region immediately. Of 157 species, 61 were CR, 13 are EN and 83 were VU.

열전도관 원자로 국내 연구 현황

김찬수(Chan Soo Kim) 한국유체기계학회 2020 유체기계 연구개발 발표회 논문집 Vol.2020 No.8

정상시력을 가진 한국인에서 연령에 따른 각막 난시의 변화

김찬수 ( Chan Su Kim ),김무연 ( Mu Yan Kim ),김현승 ( Hyun Seung Kim ),이영춘 ( Young Chun Lee ) 대한안과학회 2002 대한안과학회지 Vol.43 No.10