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- 저자 : 정효균(Hyo-Kyun Jeong) (검색결과 4 건)
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정효균(Hyo-Kyun Jeong),이명진(Myung-Jin Lee),정용진(Yong-Jin Jeong) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.11
This paper discusses about a hardware implementation method of a Lane Departure Warning System(LDWS) based on an Around View Monitoring(AVM) image. Since LDWS is used in a driving vehicle, real time operation is essential. However, because of the complicated operations that the system contains, such as Gaussian operations and Hough Transform, the system has limitations in operating in real time. In this paper, we propose a hardware acceleration to solve this problem and realize real time operation of the LDWS. We excluded data which are not used in actual situations for operation reduction, and used a parallel processed Hough Transform to maximize the efficiency of LDWS. The implemented hardware was connected to a host processor with a PCIe, which provides high speed large data transfer. The execution time of the proposed hardware implementation was 3.7ms per frame with a 600x760 imput image, and we could successfully provide enough execution time reduction required for real time operation.
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정효균(Hyo-Kyun Jeong),정용진(Yong-Jin Jeong) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.5
In this paper, we propose a new lane departure(LD) warning algorithm which is devised based upon AVM(Around view monitoring) images. Previous LD detecting algorithms usually use front view images coming through the dedicated camera mounted in the front of the car. However, these days, many cars already have built-in AVM systems and the omni-directional images produced by 4-directional AVM cameras can be used for detecting LDs. Using AVM cameras may have advantages over previous methods: cost reduction and better LD detection performance. The algorithm is composed of several steps: (1) AVM image construction, (2) lane candidate detection, (3) lane detection, and (4) LD detection. In our experimental result, comparing to the existing LD detecting method, our algorithm gives 3.5~ 9% higher detection rate. The proposed algorithm can process more than 20fps on ARM Cortex-A9 embedded processor, which means it can be used as an assistant tool for the vehicle drivers.
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HMG-CoA 환원효소 억제제에 의한 ICAM-1 유전자의 발현조절
김현진,정효균,홍우정,김군순,조영석,김도희,채수흥,구본정,송민호,노흥규,김영건 충남대학교 의과대학 지역사회의학연구소 2001 충남의대잡지 Vol.28 No.1
Background : ICAM-1 act as one of major adhesion molecules in the atherosclerotic lesion. ICAM-1 expression is mainly regulated at the level of transcription and depend on IFN-γ signal transduction pathway in which the STAT1 transcrption factor is a critical intermediate. IFN-γreceptor not only initiates tyrosine 701 phosphorylation of STAT1 by Jak1 and Jak2, but also phosphorylates serine 727 through the activation of Raf-1/MAP kinases. HMG-CoA reductase inhibitors have anti-atherosclertic effects, beyond normalization of hypercholesterolemia, by directly acting on endothelial cells, macrophages and vascular smooth muscle cells. HMG-CoA reductase inhibitors suppress the synthesis of isoprenoid intermediates such as geranylgeranyl-pyrophosphate or farnesylpyrophosphate. These effects results inhibitors suppress the synthesis of isoprenoid intermediates such as geranylgeranyl-pyrophosphate or farnesylpyrophosphate. These effects results inhibition posttranslational farnesylation and geranyl-geranylation processing of small GTP-binding preoteins and inhibition of normal signaling activities. Method : We made several 5'-deletion constructs of rat ICAM-1 promoter and analyzed the promoter activities by measuring the luciferase activity after transfection into ECV304 cells and smooth muscle cells. We checked the level of total and phosphorylated STAT1 protein by immunoblot analysis using specific antibodies. Results : Lovastatin inhibits IFN-γ-induced ICAM-1 gene expression in the ECV304cell. The cells pretreated with PD98059, MEKK inhibitor showed significantly low ICAM-1 RNA induction with IFN-γ stimulatio. IFN-γ induced phosphorylation of tyrosine 701 was not significantly changed by the pretreatment of lovastatin. But lovastatin suppresses IFN-γ-induced phosphorylation of ERK1/ERK2 which are responsible for the seine 727 phosphorylation in STAT1. Conclusion : We showed that HMG-CoA reductase inhibitors, lovastatin, suppresses IFN-γ mediated ICAM-1 gene expression through the inhibition of transcription. HMG-CoA reductase inhibitor suppresses IFN-γ-induced phosphorylation of serine 727 in STAT1 through the modulation of MAP kinases.
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