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확장 칼만 필터를 이용한 양방향 스테레오 정합에 관한 연구
이철훈,설성욱,김효성 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.4
In this paper, we propose a robust stereo matching algorithm using nonlinear extended Kalman filter. The proposed algorithm estimates disparity using nonlinear extended Kalman filter and compares left image to right image for obtained disparity. As this process is run iteratively, we get disparity only with a few search. And, we can get robust stereo matching results by comparing left image to right image using bilinear interpolation to consider influence of neighborhood pixel. We compared SSD algorithm which is widely used, in stereo matching method, to result of the proposed algorithm. As the result, the proposed algorithm has an outstanding matching performance. 본 논문에서는 비선형 확장 칼만 필터를 이용한 양방향 스테레오 정합 알고리즘을 제안한다. 제안 알고리즘은 비선형 칼만 필터를 사용하여 변이(disparity)를 예측하고 예측된 변이는 좌영상에서 우영상으로의 스테레오 정합에 적용된다. 변이 예측은 몇 번의 반복으로 구해지며 비선형 칼만 필터의 초기 상태 예측치에 큰 오차를 나타내는 단점을 극복하기 위하여 양방향 스테레오 정합 알고리즘을 사용하였다. 이웃 화소의 영향을 고려하여 선형 내삽법(intepolation)을 좌·우 영상에 적용함으로써 스테레오 정합에 강인한 결과를 나타내었다. 제안 알고리즘의 성능 평가를 위해서 기존의 SSD방법과 비교 검토하였다. 비교 결과 제안 알고리즘이 매우 우수한 정합 성능을 가짐을 알 수 있었다.
On-Line Dynamic Voltage Caling for Hard Real-Time Systems Using the EDF Algorithm
이철훈 충남대학교 산업기술연구소 2005 산업기술연구논문집 Vol.20 No.1
Recently, there has been a rapid and wide spread of non-traditional computing platforms, especially mobile and portable computing devices. As applications become sophisticated and computation power increases, the most serious limitation on these devices is the available battery life. Dynamic voltage scaling (DVS) has been a key technique to exploit the hardware characteristics of processors to reduce energy dissipation by lowering the supply voltage and operating frequency. This paper presents a novel on-line DVS algorithm called OLDVS that, when coupled with the underlying OS task management mechanism and real-time scheduler, can make significant energy savings, while preserving timeliness guarantees made by the underlying real-time scheduling algorithm. While most existing DVS algorithms are confined to period tasks only, OLDVS does not assume task periodicity, nor does it require any a priori information on the task set to be scheduled. OLDVS requires only O(1) computation on each task context switch, thus making it fairly easy to be incorporated into a real-time operating system. The OLDVS algorithm considers a general task model which is very difficult, if not impossible, for the existing DVS algorithms to handle. results show that OLDVS achieves great energy saving and outperforms the existing DVS algorithms when the ratio of the computation requirement is higher than 40%. The performance advantage becomes much larger as the ratio increases.
이철훈 한국물리학회 2004 새물리 Vol.48 No.5
Although no communication is poss-ible from a black hole to the ous-ide world, a black hole can play a significant role in many astro-physical phenomena. Parti-cularly, a black hole can be the power source for phenomena, such as AGNs, quasars and gamma-ray bursts, where enormous energy is emitted. In this work we analyze the theoretical background and explicit mechanisms for theextr- action of energy from a black hole. 블랙홀은 외부로의 통신이 단절된 존재이지만 많은 천체 현상에서 중요한 역할을 수행한다. 특히 AGN, Quasar, 감마선 폭발과 같은 막대한 에너지가 분출되는 현상에서 그 에너지를 공급하는 원천으로서의 블랙홀의 역할에 대해서 많은 연구가 진행되고 있다. 이 논문에서는 블랙홀로부터 에너지가 추출될 수 있는 이론적 배경 및 그 구체적인 과정들에 대해서 살펴본다.
Cyclin-dependent kinase(CDK)와 세포주기(cell cycle)조절을 통한 새로운 항암제의 개발 현황
이철훈,조율희 한양대학교 의과대학 2000 한양의대 학술지 Vol.20 No.1
The cell-division cycle is a tightly controlled process that is regulated by the cyclin/CDK family of protein kinase complexes. Stringent control of this process is essential to ensure that DNA synthesis and subsequent mitotic division are accurately and coordinately executed. There in now strong evidence that CDKs, their regulators, and substrates are the targets of genetic alteration in many human cancers. As a result of this, the CDKs have been targeted for drug discovery and a number of small molecule inhibitors of CDKs have been identified. Our attempt here is to illustrate the potential for development of therapeutics to treat human cancers by interfering with cell-cycle progression. Because of the central role that they play in advancing the division cycle, CDKs have been targeted for drug discovery and a number of small molecule compounds have now been identified as CDK inhibitors. These strategies and other targets of intervention within the cell cycle are discussed in our review.