토끼의 일측 신동맥 결찰수 발생된 신경색에 있어서 확산강조영사의 유용성에 관한 연구

이준우,김석,김용우,허진삼,최상열,문태용,이석홍,김병수,이창훈,Lee, Jun-Woo,Kim, Suck,Kim, Yong-Woo,Hu, Jin-Sam,Choi, Sang-Yoel,Moon, Tae-Yong,Lee, Suck-Hong,Kim, Byung-Su,Lee, Chang-Hun 대한영상의학회 1998 대한영상의학회지 Vol.38 No.2

Purpose : To assess the usefulness of diffusion-weighted imaging(DWI) in evaluating serial parenchymal changesin renal infarction induced by renal artery ligation, by comparing this with the conventional spin echo techniqueand correlating the results with the histopathological findings. Materials and Methods : In 22 rabbits, renalinfarction was induced by ligation of the renal artery. Spin-echo T1-weighted imaging(T1WI), turbo spin-echo(TSE)T2-weighted imaging(T2WI), and DWI were performed, using a 1.5-T superconductive unit, at 30 minutes, 1 hour, 2,3, 6, 12 and 24 hours, and 2, 3, 7 and 20 days after left renal artery ligation. Changes in signal intensity onT1WI, T2WI, and DWI were correlated with histopathologic findings. Results : On MR images obtained 30 minutesafter ligation, the signal intensity of affected kidney was not significantly different from that of contralateralkidney, as seen on T1WI and T2WI, but was noticeably higher on DWI. On T2WI, the signal intensity ratio(SIR) wasslightly higher over time from 30 minutes to 2 days after ligation, and then decreased slightly. The SIR on DWIincreased abruptly at 30 minutes, remained high until 12 hours, and then fell, returning to close to the normalrange at between 2 and 3 days. It fell further, below the normal range, until 20 days after ligation. The mainhistopathologic findings after ligation were congestion and swelling of renal tubules (1-6 hours after ligation),degeneration and necrosis of renal tubules (12 hours - 2 days), coagulation necrosis of renal tubules(3 days),collection of cellular debris between renal tubules (7 days), and proliferation of fibroblast between renaltubules (20 days). Conclusion : Diffusion-weighted imaging is useful for the detection of hyperacute renalinfarction, and the apparent diffusion coefficient may provide additional information concerning its evolution.

GALIS 구조 기반 실시간 분산 위치 데이타 서버 구현

이준우,이운주,이호,나연묵,Lee, Joon-Woo,Lee, Woon-Ju,Lee, Ho,Nah, Yun-Mook 한국공간정보학회 2005 한국공간정보시스템학회 논문지 Vol.7 No.1

LBS 시스템 분야의 도전할 만한 과제는 이동 객체를 다루는 수준부터 수백만 개의 이동 객체를 처리할 수 있는 높은 신뢰도의 시스템 아키텍처를 구현하는 것이다. GALIS로 명명된 아키텍처는 각각 다른 지리적 영역과 시간적 영역에 연관된 레코드를 유지하는 다수의 프로세서로 구성된 클러스터 기반 분산 컴퓨팅 시스템 아키텍처이다. 이 논문에서는 실시간 분산 객체 프로그래밍과 실시간 분산 컴퓨팅 시스템 디자인을 지원하는 미들웨어 실행 엔진을 포함하는 TMO 프로그래밍 기법을 적용하여 GALIS의 주요 요소를 구성하는 위치 데이타 서버의 프로토타입을 구현했다. 본 논문에서는 실질적으로 위치 측위 정보가 발생하는 과정과 이런 위치 정보와 위치 관련 질의가 어떻게 처리되는지도 기술하였다. 몇 가지 실험은 분산을 통해 프로세서의 부하를 줄여주어 성능향상이 있음을 살펴볼 수 있었다. A challenging task in the LBS system engineering is to implement a highly scalable system architecture which can manage moderate-size configurations handling thousands of moving items as well as upper-end configurations handling distributed computing system architecture that consists of multiple data processors, each dedicated to keeping records relevant to a different geographical zone and a different time zone. In this paper, we explain a prototype location data server structuring major components of GALIS by employing the TMO programming scheme, including the execution engine middleware developed to support real-time distributed object programming and real-time distributed computing system design. We present how to generate realistic location sensing reports and how to process such location reports and location-related queries. Some experimental results showing performance factors regarding distributed query processing are also explained.

임도공사시 굴삭기를 이용한 토공작업의 공정분석

이준우,박범진 ( Joon Woo Lee,Bum Jin Park ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.1

This study was carried out to investigate working time, performance, and to predict performance that related to the factor of forest road in earth work using excavator. It was found that the real working time was 503 minutes in a day. The ratio of real working time and allowance per total working time was approximately 85.7% and 14.3% individually. The rate of soil movement(Sm) to net working time was 38.6%, and earth cutting(Ec) was 32.5% . According to performance analysis, performance of earth work using excavator(0.8㎥) in straight part was 1.4 times larger than curve part and rock work using excavator(0.8㎥) which had breaker in straight was 9.1 times larger than earth work using excavator(0.8㎥) which had bucket. Performance of earth work using excavator(1.0㎥) was 1.3 times larger than using excavator(0.8㎥) in straight and curve part. Working performance in earth work using excavator(0.8㎥) was influenced by the conditions of radius of curve, width of roadway, slope gradient. It is not influenced by diameter and number of root stock.

리튬 이차전지용 텅스텐 산화물 전해 도금 박막 제조

이준우,최우성,신헌철,Lee, Jun-Woo,Choi, Woo-Sung,Shin, Heon-Cheol 한국재료학회 2013 한국재료학회지 Vol.23 No.12

Tungsten oxide films were prepared by an electrochemical deposition method for use as the anode in rechargeable lithium batteries. Continuous potentiostatic deposition of the film led to numerous cracks of the deposits while pulsed deposition significantly suppressed crack generation and film delamination. In particular, a crack-free dense tungsten oxide film with a thickness of ca. 210 nm was successfully created by pulsed deposition. The thickness of tungsten oxide was linearly proportional to deposition time. Compositional and structural analyses revealed that the as-prepared deposit was amorphous tungsten oxide and the heat treatment transformed it into crystalline triclinic tungsten oxide. Both the as-prepared and heat-treated samples reacted reversibly with lithium as the anode for rechargeable lithium batteries. Typical peaks for the conversion processes of tungsten oxides were observed in cyclic voltammograms, and the reversibility of the heat-treated sample exceeded that of the as-prepared one. Consistently, the cycling stability of the heat-treated sample proved to be much better than that of the as-prepared one in a galvanostatic charge/discharge experiment. These results demonstrate the feasibility of using electrolytic tungsten oxide films as the anode in rechargeable lithium batteries. However, further works are still needed to make a dense film with higher thickness and improved cycling stability for its practical use.

최인접 거리 비율 정합을 이용한 영상 특징점 선택 방법

이준우,정재협,강종욱,나상일,정동석,Lee, Jun-Woo,Jeong, Jea-Hyup,Kang, Jong-Wook,Na, Sang-Il,Jeong, Dong-Seok 대한전자공학회 2012 전자공학회논문지 Vol.50 No.8

본 논문에서는 현재 진행 중인 MPEG(Motion Picture Experts Group, ISO/IEC JTC1 SC29 WG11)의 표준화 작업 중 CDVS(Compact Descriptor for Visual Search)의 CE-7(Core Experiment)인 특징점 선택에 대한 방법을 제안한다. 서술자의 경량화를 위해서는 영상으로부터 추출된 많은 수의 특징점들 중에서 영상 정합에 사용될 중요한 특징점들을 선택해야 한다. 본 논문에서는 최 인접 거리 비율 정합(Nearest Neighbor distance ratio matching) 방법에 의해 영상 정합 단계에서 사용되지 않고 버려지는 특징점들을 미리 추출 단에서 제거하는 방법 제안하였다. 제안된 방법을 통하여 적은 비트 전송률을 요하는 시스템에서 특징점의 낭비를 피할 수 있고 결과적으로 추가적인 특징점을 사용할 수 있으므로 전체적인 성능 향상을 얻을 수 있었다. 제안된 알고리즘을 통하여 Pair-wise 정합 실험에서 기존의 Test Model 대비 최고 2.3%의 성공율(True positive rate)의 향상을 보였다. In this paper, we propose a feature point selection method for MPEG CDVS CE-7 which is processing on International Standard task. Among a large number of extracted feature points, more important feature points which is used in image matching should be selected for the compactness of image descriptor. The proposed method is that remove the feature point in the extraction phase which is filtered by nearest neighbor distance ratio matching in the matching phase. We can avoid the waste of the feature point and employ additional feature points by the proposed method. The experimental results show that our proposed method can obtain true positive rate improvement about 2.3% in pair-wise matching test compared with Test Model.

수박 엘리트 계통의 GBS를 통한 마커이용 육종용 SNP 마커 개발

이준우,손병구,최영환,강점순,이용재,제병일,박영훈,Lee, Junewoo,Son, Beunggu,Choi, Youngwhan,Kang, Jumsoon,Lee, Youngjae,Je, Byoung Il,Park, Younghoon 한국식물생명공학회 2018 식물생명공학회지 Vol.45 No.3

본 연구는 국내 육종 회사에서 개발된 수박(Citrullus lanatus L.) 우량 육성계통 20종을 대상으로 Genotyping-by-sequencing(GBS) 분석을 통해 품종식별, 순도검정, 그리고 마커이용여교잡(Marker-assisted backcross, MABC)용 SNP 세트를 개발하고자 수행되었다. GBS 분석 결과 총 1,100,000천개 raw read 중 77%가 수박 유전체에 mapping되었으며 평균 mapping region은 약 4,000 Kb로 2.3%의 genome coverage를 보였다. Filtering을 통해 평균 depth 31.57의 SNP 총 2,670개를 얻었으며, 20개 계통에 대한 이들의 Polymorphic information content(PIC) 값의 범위는 0.1 ~ 0.38 였다. 이 중 PIC 값이0.3이상이며 각 염색체 별로 5개씩 균등히 분포된 SNP 총 55개를 최종 선발하였다. 사용된 20개 계통의 유연관계분석을 위해 선발된 55개 SNP를 기반으로 한 주성분 분석(Principle component analysis, PCA) 결과 주성분 1 (52%)과 주성분 2 (11%)를 기준으로 4개의 그룹으로 분류 되었으며 각 계통 간 유전자형에 따른 뚜렷한 식별이 가능하였다. 계층적 군집화(Hierarchical clustering) 분석에서도PCA에서와 유사한 분류양상을 관찰할 수 있었다. 따라서 본 연구에서 개발된 SNP 세트는 적용 가능성이 검증된 20개 계통뿐 만 아니라 향후 다양한 수박 육종소재 및 품종에 대한 품종식별, F1 순도검정 및 MABC에 활용될 수 있으리라 기대된다. This study was conducted to develop an SNP set that can be useful for marker-assisted breeding (MAB) in watermelon (Citrullus. lanatus L) using Genotyping-by-sequencing (GBS) analysis of 20 commercial elite watermelon inbreds. The result of GBS showed that 77% of approximately 1.1 billion raw reads were mapped on the watermelon genome with an average mapping region of about 4,000 Kb, which indicated genome coverage of 2.3%. After the filtering process, a total of 2,670 SNPs with an average depth of 31.57 and the PIC (Polymorphic Information Content) value of 0.1~0.38 for 20 elite inbreds were obtained. Among those SNPs, 55 SNPs (5 SNPs per chromosome that are equally distributed on each chromosome) were selected. For the understanding genetic relationship of 20 elite inbreds, PCA (Principal Component Analysis) was carried out with 55 SNPs, which resulted in the classification of inbreds into 4 groups based on PC1 (52%) and PC2 (11%), thus causing differentiation between the inbreds. A similar classification pattern for PCA was observed from hierarchical clustering analysis. The SNP set developed in this study has the potential for application to cultivar identification, F1 seed purity test, and marker-assisted backcross (MABC) not only for 20 elite inbreds but also for diverse resources for watermelon breeding.

보이스코일 액튜에이터를 기반으로 한 고정밀 직선이송 시스템의 위치결정

이준우,김병희,장인배,Lee, Jun-Woo,Kim, Byeong-Hee,Chang, In-Bae 강원대학교 산업기술연구소 1999 産業技術硏究 Vol.19 No.-

The voice coil actuator uses the Lorentz force between the magnetic field of the permanent magnets and the electromagnets to the motions and positioning. The small size, light weight and fast dynamic response of the these type actuators lead to admit them in the micro-positioning apparatus of the micro-machining systems. In this paper, the linear motion voice coil actuator is developed for the driving and positioning the rotating electrode of the electric discharge machine (EDM). The analyzed and measured results for the actuator are compared and discussed.

CCl4 로 독성을 유발시킨 초대배양 간세포를 이용한 고등균류로부터 간세포 보호물질의 검색

이준우,한만덕,이권행 ( June Woo Lee,Man Deuk Han,Kweon Haeng Lee ) 한국균학회 1992 韓國菌學會誌 Vol.20 No.4

Revisit to Mesophase Structure of Combined Type Liquid Crystalline Polymers Consisting of Poly(p-phenyleneterephthalate) Bacbone and Azobeznene Type Chromophores Attached Through Long Alkylene Spacers

이준우,진정일,Lee, Jun U,Jin, Jeong Il Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.10

INTERVIEW한국데이터베이스 진흥센터(KDPC) 전무이사 이준우

이준우,Lee, Jun-U 한국데이터베이스진흥원 2002 디지털콘텐츠 Vol.5 No.-