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Parametric analysis of KLT algorithm in autonomous driving
Youngsoo Han,Changhyeon Kim,Youngseok Jang,H. Jin Kim 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
The Kanade-Lucas-Tomasi(KLT) tracking algorithm is a widely used feature tracking algorithm in the field of computer vision(CV). The selection of proper warping parameters for the estimation of optical flow between adjacent image frames is crucial to obtain accurate and robust tracking results. We compare the various warping parameter settings in an autonomous driving environment based on the modified KLT algorithm with some well-known techniques. The skew and rotation parameters did not show better performance, but rather made convergence more difficult. The scale-parameter-added model has the best performance among the sets of warping parameters.
Han, Jinju,Han, Sunlee,Sung, Wonmo,Lee, Youngsoo Elsevier 2018 Journal of CO₂ utilization Vol.28 No.-
<P><B>Abstract</B></P> <P>This study experimentally investigated the impact of CO<SUB>2</SUB> miscible flooding on oil recovery and alteration of rock properties in two carbonate cores consisting of more than 98% calcite: Edwards white representing a homogenous medium mainly consisted of micropores, and Indiana limestone representing a heterogeneous medium mostly composed of macropores. Several methods were applied to investigate the alteration of rock properties by CO<SUB>2</SUB>-water-carbonate minerals interactions: 1) Core flooding to measure overall changes, 2) MICP and X-ray CT to analyze small pores and large pores, respectively, 3) SEM, PCM, and ICP to verify physical and chemical reactions.</P> <P>Oil recovery was higher in Edwards white than in Indiana limestone, since characteristic of Edwards white contributes to sufficient contact time and stable displacement between oil and CO<SUB>2</SUB>. From the analysis of the alteration of rock properties in homogenous sample, dissolution facilitates the enlargement of pore sizes. Therefore, fluid flow becomes more favorable. The precipitation is not critical determinant of alteration process, despite the high proportion of small pores. For heterogeneous sample, both dissolution and precipitation significantly affect to alteration of pore structure. Particularly, the precipitation seriously damaged to the main flow channels. These undesirable effects on fluid flow appeared at injection point, which was exposed to fresh CO<SUB>2</SUB> for a long time.</P> <P>This study suggests that pore structure analysis allows a more exact interpretation and judgment of the alteration of pore structure by dissolution and precipitation and can assist in designing injection plans, particularly near the injection area or in complex pore structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Initial pore structure is crucial for CO<SUB>2</SUB> flooding in carbonate reservoirs. </LI> <LI> Quantitative pore analysis was performed using MICP and X-ray CT. </LI> <LI> Chemical and physical reactions affect flow characteristics and oil recovery. </LI> <LI> Dissolution and precipitation are simultaneously occurred in pore network. </LI> <LI> Alteration of rock properties is important in designing CO<SUB>2</SUB> EOR and CCS. </LI> </UL> </P>
N-Acetylphytosphingosine Enhances the Radiosensitivity of Lung Cancer Cell Line NCI-H460
Youngsoo Han,Kisung Kim,Ji-Young Shim,Changsoe Park,송지영,윤연숙 한국분자세포생물학회 2008 Molecules and cells Vol.25 No.2
Ceramides are well-known second messengers that induce apoptosis in various kinds of cancer cells, and their effects are closely related to radiation sensitivity. Phytoceramides, the yeast counterparts of the mammalian ceramides, are also reported to induce apoptosis. We investigated the effect of a novel ceramide derivative, N-acetylphytosphingosine (NAPS), on the radiosensitivity of NCI-H460 human lung carcinoma cells and its differential cytotoxicity in tumor and normal cells. The combination of NAPS with radiation significantly increased clonogenic cell death and caspase- dependent apoptosis. The combined treatment greatly increased Bax expression and Bid cleavage, but not Bcl-2 expression. However, there was no effect on radiosensitivity and apoptosis in BEAS2B cells, which derive from normal human bronchial epithelium. Cell proliferation and DNA synthesis were significantly inhibited by NAPS in both NCI-H460 and BEAS2B cells, but only the BEAS2B cells recovered by 48h after removal of the NAPS. Furthermore, the NCI-H460 cells underwent more DNA fragmentation than the BEAS2B cells in response to NAPS. Our results indicate that NAPS may be a potential radiosensitizing agent with differential effects on tumor vs. normal cells.
이영수(YoungSoo Lee),한기환(Gihwan Han),정윤구(YunGu Jeong),김영진(YeonGjin Kim),한새론(SaeRon Han),이성용(SeoungYong Lee),최관순(KwanSun Choi) 한국정보기술학회 2012 Proceedings of KIIT Conference Vol.2012 No.11
본 연구에서는 LabVIEW와 웹캠을 이용해 방범시스템을 구축하였다. LabVIEW Machine Vision을 이용해 웹캠의 영상을 분석하여 화면 내에 기존과 다른 물체가 들어왔는지 검출하는 구조로 되어있다. 다른 물체가 검출이 되면 이를 사용자에게 알리는 동시에 현 상황을 녹화하고 침입자에게 경고음을 방송하게 설계되었다. 따라서 이 시스템은 고가의 장비가 필요하지 않고 구성이 간단하여 일반 가정이나 고정된 물체를 감시할 때 사용할 수 있다. In this study, we implemented a crime prevention system using LabVIEW and web camera. It detect changes in a screen by analyzing the image of the web camera using LabVIEW Machine Vision. In case of a change detecting the system notify user, recording the current situation and caution suspicious object or criminal. Therefore, It dies not require expensive equipment and can be used in monitoring a home or a fixed objet.