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클라우드 컴퓨팅을 위한 하둡 작업 스케줄링 알고리즘의 비교 연구
권갑현 동양대학교 2010 동양대학교 논문집 Vol.14 No.1
Cloud computing, recently emerging computing paradigm, is based on research of distributed computing, grid computing, and web technology. The main goal of cloud computing is to provide massive resources which can be accessed by the end users anytime, anywhere. To deal with massive distributed data in the cloud, "Hadoop" has been proposed. Hadoop is a software platform to enable a programmer to implement easily an application using map/reduce algorithm. Despite of the goal of hadoop to achieve high performance, hadoop only adopts a FIFO algorithm to schedule jobs requested by users. In this paper we propose a job scheduler utilizing several scheduling algorithm which can be adopted dynamically without modification of hadoop source code.
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권갑현,하영호,김수중 한국의학물리학회 1991 의학물리 Vol.2 No.2
형광 안저 사진은 형광 물질을 정맥에 주사한 후 안저를 연속 촬영한 것으로 이로부터 망막 및 맥락막의 혈관 상태를 관찰하여 안과계 질환 뿐만아니라, 당뇨병, 고혈압 등 내과계 질병도 진단한다. 순차적으로 안저 사진을 촬영할 때 안구의 불규칙적인 운동으로 인하여 프레임마다 특정 영역의 위치가 달라질 수 있으며, 조명 상태의 변동에 의해 프레임마다 배경 명암이 달라질 수 있다. 이러한 형광 안저 사진에서 프레임간 변화분을 검출하기 위해 직접 두 프레임을 빼는 것은 부적합하다. 본 논문에서는 형광 안저 사진의 프레임간 변화분을 정확하게 검출할 수 있도록 형광안저 사진의 기하 왜곡을 교정하는 방법을 제안한다. 먼저 안저 사진으로부터 혈관을 검출하고 이를 세선화하여 제어점의 좌표를 정한다. 제어점을 이용하여 기하 변환함수를 구하고 각 프레임을 맵핑하므로써 기하 왜곡을 교정한다. 기하 왜곡을 교정한 두 프레임을 화소별로 빼어 차영상을 구한 결과 프레임간 변화를 정확하게 검출할 수 있었다. Ophthalmoscopy following the intravenous injection of fluorescein has gained great diagnostic importance in ophthalmology. This technique provides sequential evaluation of the anatomic and physiologic status of the choroidal and retinal vasculature. In order to detect the changes between fluorescein ocular fundus image frames, the direct subtraction of the two frames is inadequate because of geometric distortions and background gray level differences in two images. In this study, a scheme for the correction of the geometric distortions is proposed. Precise control point coordinate values for transformation functions are manually determined after the process including a series of blood vessel detection and thinning, and one frame is mapped to another, and then a geometric distortion corrected image is obtained. When the corrected image is used in interframe change detections, a sucessful result is ensured.
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權甲鉉 울산과학대학 1987 연구논문집 Vol.12 No.1
본 연구에서는 調整이 용이하고 能動補償된 差動電壓制御電流源回路를 제안하고 컴퓨터 解析을 통하여 개선된 周波數特性을 확인하였다. In this study, an actively compensated differential voltage controlled current source which is easily turnable, is proposed, and its improved frequency response characteristics are confirmed through computer analyses.
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권갑현,하영호,김수중,Kwon, Kap-Hyeon,Ha, Yeong-Ho,Kim, Soo-Joong 대한의용생체공학회 1991 의공학회지 Vol.12 No.4
In this paper, the inter- and intra-frame distortions in the gray levels of a series of fluorescein ocular fundus photographs are corrected. For doing this, the background images are extracted from original images using the image blurring effect by decimation, and then shading corrected images are obtained by subtracting the background images from the original images pixel by pixel. In a series of fluorescein ocular fundus photographs, after the gray scale distoriton is corrected, the intensity volumes of dye leakage are measured and represented by a graph. These data may be useful for the prediction of prognosis and the therapeutic management.
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권갑현,서정상 동양대학교 2000 동양대학교 논문집 Vol.6 No.1
Recently, in every class of schools and evaluation institutes they are checking the OMR exam sheets through a card reader for exclusive use. Not only because it is very expensive but also because there is few domestic made card reader, it's true that we usually depend on imported products. On the other hand, as the image processing techniques have been improved largely, a digital camera which is image-inputting device is spreading widely. This study suggests a preprocessing method that can put OMR exam sheet in by using a digital camera and read it by using a PC. After we emphasize the contrast of the image that was put into a PC, make it binary, and clear the isolated noises in the binarized image, and then we can make marts on the card be interpreted exactly.
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權甲鉉 울산과학대학 1982 연구논문집 Vol.7 No.1
演算增幅器의 有限한 利得-帶域幅積이 計測增幅器의 周波數特性에 미치는 영향을 줄이기 위하여 能動補償方法을 써서 演算增幅器 4個와 抵抗만으로 入力임피이던스가 높고 能動補償된 計測增幅器를 構成하였다. 實驗 結果 提案된 回路가 改善된 周波數特性을 나타내었다. An actively compensated instrumentation amplifier reducing the effects of the finite gain bandwidth products of operational amplifiers is realized only by the use of 4 operational amplifiers and some registors. The performances of the actively compensated instrumentation amplifier are compared with those of the uncompensated one by means of the experimental results and shown to offer an improved frequency response.
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權甲鉉 울산과학대학 1988 연구논문집 Vol.13 No.2
본 논문에서는 Natarajan과 Bhattacharyya 및 Soliman과 Ismail의 능동보상 유한 이득 증폭기회로를 해석하였다. 그 결과 두 회로는 구성이 달라도 전달 함수는 같았다. 또한 이들 회로를 대역 통과 여파기 회로의 설계에 응용하여 실험한 결과 Natarajan과 Bhattacharyya의 유한 이득 증폭기가 출력의 안정성 면에서 우수하였다. In this paper the Natarajan and Bhattacharyya's and the Soliman and Ismail's actively compensated finite gain amplifier circuits are analized. As the result the circuit configurations are different from each other, but their transfer functions are same. And these circuits are applied to the design of a band-pass filter. The experimental results show that the Natarajan and Bhattacharyya's amplifier is slightly superior to the Soliman and Ismail's amplifier in the aspect of the output stability.
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권갑현,서정상 동양대학교 1999 동양대학교 논문집 Vol.5 No.1
In this paper, a method for scoring OMR exam sheets using image processing techniques is suggested. In many schools, the special-purpose OMR card reader is used to score OMR exam sheets, but it is very expensive and foreign-made as well. Jn this method, a PC and a digital camera are used, so it is relatively low-priced. In addition, the intermediate images produced in this procedure can be stored easily in the computer storage media. Therefore, the necessary store space can be significantly reduced, and the specific card image can be easily retrieved.
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