그린수소생산을 위한 PEM 수전해 양극 담지촉매 개발 동향

이창수,이세찬,이재훈,김민중,조현석,김상경,조원철,Lee, Chang-Su,Lee, Se-Chan,Lee, Jae-Hun,Kim, Min-Jung,Jo, Hyeon-Seok,Kim, Sang-Gyeong,Jo, Won-Cheol 한국전기전자재료학회 2021 전기전자재료 Vol.34 No.6

중국도서관분류법 제5판의 특성 분석

이창수,Lee, Changsoo 한국도서관정보학회 2012 한국도서관정보학회지 Vol.43 No.3

중국도서관분류법(中國圖書館分類法)(CLC: Chinese Library Classification)은 중국에서 가장 널리 통용되는 국가 표준분류법으로 1975년에 초판을 발행한 이래 2010년에는 제5판을 출판함으로써 약 9년마다 개정을 하고 있다. 이 연구에서는 CLC의 성립배경과 발전과정 그리고 제5판의 특성과 개정내용을 분석함으로써 한국과 문화적으로 오랜 관련성을 유지해온 중국의 대표적인 분류법을 고찰하고 한국십진분류법(KDC) 전개에 참고할 시사점을 파악하였다. The Chinese Library Classification(CLC) is the most widely used national standard classification system in China. Since the first edition of CLC in 1975, the 5th edition of CLC was published in 2010. It was the result of an average of 9 years of revision for each edition. This study investigated CLC focusing on the formational background and developmental process of CLC, and characteristics and revision details of CLC's 5th edition. Because Korea has been close cultural relationship with China for a long time, this study will provide implications on Korean Decimal Classification(KDC) development.

능동적 블록정합기법을 이용한 객체의 움직임 검출에 관한 연구

이창수,박미옥,이경석,Lee Chang-Soo,Park Mi-Og,Lee Kyung-Seok 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.4c

카메라를 통한 객체의 움직임 검출은 불필요한 잡음이나 조명의 변화에 따라 정확한 움직임을 검출하는 것은 어렵다. 또한 객체의 유입 후 일정시간 동안 움직임이 없을 경우에는 배경으로 인식될 수도 있다. 따라서 실시간으로 입력되는 영상에서 정확한 객체를 추출하고 움직임을 검출할 수 있는 알고리즘이 필요하다. 본 논문에서는 객체의 정확한 움직임을 검출하기 위한 방법은 시간에 따라 변화하는 배경영상의 일부를 교체하고, 객체가 유입된 시점에서 객체의 영역을 추출하기 위하여 그물형 픽셀검사를 통하여 객체의 윤곽점을 추출한다. 추출된 윤곽점은 객체의 사각영역인 최소블록의 생성과 객체의 움직임을 빠르게 검출하기 위한 가변 탐색블록을 생성하여 정확한 객체의 움직임을 검출한다. 설계하고 구현한 시스템은 실험을 통한 성능평가에서 95% 이상의 높은 정확도를 보였다. It is difficult for the movement detection of an object through a camera to detect exact movement because of unnecessary noises and changes of the light. It can be recognized as a background, when there is no movement after the inflow of an object. Therefore, It is necessary to fast search algorithm for tracking and extract of object that is realtime image. In this thesis, we evaluate the difference of the input vision based on initial image and replace some pixels in process of time. When there is a big difference between background image and input image, we decide it is the point of the time of the object input and then extract boundary point of it. The extracted boundary point detects precise movement of the object by creating minimum block of it and searching block that maintaining distance. The designed and embodied system shows more than 95% accuracy in the performance test.

Fabrication of Disposable Protein Chip for Simultaneous Sample Detection

이창수,김윤곤,이영우,김병기,오민규,황택성,Sang-Ho Lee,Hwan-Moon Song,Bo-Yeol Kim,김용권 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.5

In this study, we have described a method for the fabrication of a protein chip on silicon substrate using hydrophobic thin film and microfluidic channels, for the simultaneous detection of multiple targets in samples. The use of hydrophobic thin film provides for a physical, chemical, and biological barrier for protein patterning. The microfluidic channels create four protein patterned strips on the silicon surfaces with a high signal-to-noise ratio. The feasibility of the protein chips was determined in order to discriminate between each protein interaction in a mixture sample that included biotin, ovalbumin, hepatitis B antigen, and hepatitis C antigen. In the fabrication of the multiplexed assay system, the utilization of the hydrophobic thin film and the microfluidic networks constitutes a more convenient method for the development of biosensors or biochips. This technique may be applicable to the simultaneous evaluation of multiple protein–protein interactions.

UDC 한국어판의 개정에 관한 연구

이창수,Lee, Chang-Soo 한국과학기술정보연구원 과학기술정보센터 2010 Journal of Information Science Theory and Practice Vol.41 No.3

본 연구의 목적은 2005년 영국의 BSI(British Standards Institution)에서 인쇄 형태로 출판된 UDC(Universal Decimal Classification)의 표준판과 1973년 한국과학기술정보센터(KORSTIC, Korea Scientific & Technological Information Center)에서 출판된 UDC의 한국어판을 비교 분석하여 한국어판의 개정방향을 제시하는 데 있다. 앞으로 개정될 한국어판은 표준판의 규모로 한국어 간략판과 MRF(Master Reference File)를 바탕으로 표준판의 체제에 따라 본표와 색인으로 된 인쇄판이 되어야하며, 국제적 보편성을 강화하고, 보조표를 통한 조합의 방식을 더욱 확대할 필요가 있음을 제언 하였다. The purpose of this study is to compare and analyze the print form of UDC(Universal Decimal Classification) standard edition which was published by British Standards Institution in 2005 to Korean edition which was published by Korea Scientific & Technological Information Center in 1973, and to suggest the appropriate revision directions of future Korean edition. This study suggests that the future Korean edition should be revised based on the Master Reference File and should be a print edition which is composed of systematic tables and alphabetical index from the standard edition. In addition, the future Korean edition needs to strengthen international universality and to extend synthetic method using its auxiliary tables.

FFT를 이용한 주파수 영역의 RVDT 센서 오차 보상

이창수,Lee, Chang-Su 한국전기전자학회 2012 전기전자학회논문지 Vol.16 No.3

본 논문에서는 FFT 영역을 이용한 새로운 RVDT 인코더의 위상 오차 보상 방법을 제시하였다. 최소 개수의 보상 저항의 조합으로 오차를 측정하고 FFT 변환 후 1차 하모닉 성분의 저항에 따른 계수의 변화를 구하였다. 또한 삽입 저항과 계수의 크기가 반비례 관계에 있음을 알아냈다. 이 방법은 기존의 시간 영역에서의 보상에 비해 테이블을 구하는데 드는 시간이 단축되고 테이블의 크기를 획기적으로 줄일 수 있었다. 또한 축변환을 통해 보상 저항의 위치도 정확히 찾을 수 있었으며 첨두간 위상 오차값을 0.57도 정도로 2배 가까이 개선하였다. This paper proposes new phase error compensation method of RVDT encoder in the FFT domain. Phase errors are measured with a small combination of compensation resistors and the changes of first order coefficients of FFT for each resistor are obtained. It is found that the coefficient change is inversely proportional to the inserted resistor. The proposed method takes less time and the size of the table is smaller than previous time domain approaches. In addition, the location of the compensation resistor can be found through axis transformation of the coefficients. Finally, the peak-to-peak phase error was improved to 0.57 which is two times better than previous one.

Wavelet frame 변환을 이용한 냉연 시각검사 알고리듬

이창수,최종호,Lee, Chang-Su,Choi, Jong-Ho 제어·로봇·시스템학회 1998 제어·로봇·시스템학회 논문지 Vol.4 No.3

This paper deals with the detection, feature extraction and classification of surface defects in cold rolled strips. Inspection systems are one of the most important fields in factory automation. Defects such as slipmark and dullmark can be effectively detected with a Gaussian matched filter because their shapes are similar to Gaussian. It is justified that the proposed WF(Wavelet Frame) method could be regarded as multiscale Gaussian matched filter which can be applied to the inspection of cold rolled strip. After a wavelet frame transform, the entropies and moments are computed for each subband which pass through both local low pass filter and nonlinear operator. With these features as input, a MLP(Multi Layer Perceptron) is used as a classifier. The proposed inspection method was applied to the real images with defects, and hence showed good performance. The role of each extracted feature is analyzed by KLT(Karhunen-Loeve Transform).

서울시내 위치한 콘크리트 고가차도의 내구성능 조사 및 평가

이창수,윤인석,Lee. Chang-Soo,Yoon. In-Seok 한국방재학회 2002 한국방재학회논문집 Vol.2 No.1

본 연구는 서울시내 위치한 39개 콘크리트 고가차도의 중성화 깊이, 가용성 염화물량 및 철근의 자연전위 등을 측정하여 열화의 원인을 분석하기 위한 기초자료를 얻고자 하였다. 전체 조사대상 구조물 가운데 철근위치까지 중성화 깊이가 진행된 구조물은 약 25%에 해당되었으며 중성화 속도는 물-시멘트비 60%, R=1의 조건인 kishitani의 제안식 3.727 <TEX>$\sqrt{t}$</TEX> 보다 5%가 빠른 3.92 <TEX>$\sqrt{t}$</TEX>로 나타났다. 콘크리트의 염화물량의 조사결과에서는 전체 측정부위의 24%가 임계염화물량을 초과하였으며 철근의 자연전위는 -350mV(vs. CSE)이하로 측정된 것이 약 31%에 해당되는 구조물로서 과다한 염화물량이 철근부식의 주요 원인이 되는 것으로 조사되었다. 자연전위 -350mV 이하인 구조물에 한한 철근부식의 주요요인을 추정한 결과, 약 60%에 해당하는 부위가 치대 허용염화물량을 초과하였기 때문으로 분석된다. The objectives of this paper were to obtain the fundamental data to analyze the causes of deterioration of 39 freeway concrete viaducts in Seoul metropolitan area. To investigate the degree of concrete deterioration, carbonation depth, soluble chloride concentration in hardened concrete and half-cell potentials of reinforcement were measured. The number of structures which carbonation depth penetrates to reinforcement was 25% of total. The model of carbonation .ate was induced to 3.92 <TEX>$\sqrt{t}$</TEX>, which was 5% faster than 3.727 <TEX>$\sqrt{t}$</TEX> assumed 60% water-cement ratio, R=1 in that of kishitani. After measuring chloride concentration in concrete, it was concluded that about 24% of all readings on samples from concrete exceed the critical content to minimize the risk of chloride-induced corrosion. About 31% of the freeway viaducts structures had a value lower than -350mV(vs. CSE), so it could conclude that the excessive chloride concentration was the major cause of reinforcement corrosion. Among the structures which measured half-cell potentials less than -350mV, about 50% exceeds the maximum acceptable limit of chloride concentration.

Biochemical Reactions on a Microfluidic Chip Based on a Precise Fluidic Handling Method at the Nanoliter Scale

이창수,김병기,최창형,Sang-Ho Lee,김윤곤,Yong-Kweon Kim 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2

A passive microfluidic delivery system using hydrophobic valving and pneumatic control was devised for microfluidic handling on a chip. The microfluidic metering, cutting, transport, and merging of two liquids on the chip were correctly performed. The error range of the accuracy of microfluid metering was below 4% on a 20 nL scale, which showed that microfluid was easily manipulated with the desired volume on a chip. For a study of the feasibility of biochemical reactions on the chip, a single enzymatic reaction, such as a b-galactosidase reaction, was performed. The detection limit of the substrate, i.e. fluorescein di-b-galactopyranoside (FDG) of the b-galactosidase (6.7 fM), was about 76 pM. Additionally, multiple biochemical reactions such as in vitro protein synthesis of enhanced green fluorescence protein (EGFP) were successfully demonstrated at the nanoliter scale, which suggests that our microfluidic chip can be applied not only to miniaturization of various biochemical reactions, but also to development of the microfluidic biochemical reaction system requiring a precise nano-scale control.

미소파괴음을 이용한 KURT 화강암의 미시적 균열발달특성에 관한 연구

이창수,이경수,김진섭,최희주,Lee, Chang-Soo,Lee, Kyung-Soo,Kim, Jeop-Seop,Choi, Hey-Joo 한국방재학회 2013 한국방재학회논문집 Vol.13 No.2

본 연구에서는 Acoustic Emission(AE) 분야의 모멘트텐서해석기법을 적용하여 굽힘하중을 받는 화강암의 인장파괴 메커니즘을 분석하였다. 해석결과 균열발생 구간은 파괴면과 일치하는 것으로 나타났다. 그러나 최대하중의 70%를 초과하면서부터 인장균열이 노치첨단부, 전단균열은 파괴면을 중심으로 발생하며 파괴는 전단균열의 발달인 것으로 해석되었다. 이는 미세균열은 결합이 상대적으로 약한 광물 경계부를 따라 발생하기 때문이다. 따라서 인장응력이 시료에 가해지더라도 불규칙한 광물 배열로 인하여 인장균열과 전단균열은 복합적으로 발생하며 특히 전단균열은 미끌림 형태로 이웃하는 균열과 결합 성장을 함에 따라 파괴 시 누적 체적비는 62%로 나타났다. In this study, moment tensor analysis in acoustic emission (AE) was adopted to analyze the tensile failure mechanism of granite under three point bending load. Source location result was in remarkable agreement with the real failure plane. However, it was showed that although the tensile failure was initiated by the tensile cracks generated from the tip of V shape notch, the failure was mainly caused by shear cracks occurred along the failure boundary. This is considered due to the irregular arrangement of mineral rock. Therefore despite the fact tensile stress was applied to the specimen, tensile and shear cracks were well distributed. In addition, shear cracks interacted with existing neighboring cracks and when the failure occurred, the cumulative volume reached approximately 62%.