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( Ji Eun Jun ),( Young Ju Choi ),( Yong-ho Lee ),( Dae Jung Kim ),( Seok Won Park ),( Byung Wook Huh ),( Eun Jig Lee ),( Sun-ha Jee ),( Kyu Yeon Hur ),( Sung Hee Choi ),( Kap Bum Huh ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.1
Background/Aims: This study aimed to investigate whether the apolipoprotein (Apo) B/ApoA-I ratio is associated with carotid intima-media thickness (CIMT) in type 2 diabetes mellitus (T2DM) subjects with low density lipoprotein cholesterol (LDL-C) levels less than 100 mg/dL. Methods: This cross-sectional study included 845 subjects aged with T2DM 40 to 75 years who had visited Huh’s Diabetes Center in Seoul, Republic of Korea for CIMT measurement. Traditional fasting lipid profiles, ApoB and ApoA-I levels were examined. CIMT was measured at three points on the far wall of 1 cm long section of the common carotid artery in the proximity of the carotid bulb. The mean value of six measurements from right and left carotid arteries were used as the mean CIMT. In this study, carotid atherosclerosis was defined as having a focal plaque or diffuse thickening of the carotid wall (mean CIMT ≥ 1.0 mm) Results: The prevalence of carotid atherosclerosis increased with ApoB/ApoA-I ratio. The ApoB/ApoA-I ratio, expressed as both quartiles (odds ratio [OR], 2.14; 95% confidence interval [CI], 1.21 to 3.79; p for trend = 0.014) and continuous values (OR, 10.05; 95% CI, 3.26 to 30.97; p < 0.001), was significantly associated with a higher risk for carotid atherosclerosis, regardless of conventional cardiovascular disease risk factors. The optimal ApoB/ApoA-I ratio cutoff value for detecting carotid atherosclerosis was 0.57, based on receiver operating characteristic curve analysis with a sensitivity of 58.0% and a specificity of 55.1%. Conclusions: A high ApoB/ApoA-I ratio was significantly associated with carotid atherosclerosis in T2DM patients with LDL-C levels less than 100 mg/dL.
허준영,윤영환 한국기술교육대학교 2006 論文集 Vol.12 No.1
The modelling and design of the PCV(Pressure Control Valve) for CVT(Continuously Variable Transmission) are considered in this paper. For the analysis and design, the simulation model of the PCV(Pressure Control Valve) is derived by using commercial software, AMESim. For a good design of the PCV, the sensitivity analysis for design parameters is carried out and the static and dynamic characteristics are experimented. The simulation and experimental results are presented to show the validity of the design process.
허진헌,김영일,전차수 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1(1)
Presented in this paper is a new fast and robust algorithm generating NC tool path for 2D pockets with islands. The input shapes are composed of line segments and circular arcs. The algorithm has two steps: creation of successive offset loops and linking the loops to tool path. A modified pair-wise technique is developed in order to speed up and stabilize the offset process, and the linking algorithm is focused on minimizing tool retractions and preventing thin-wall cutting. The proposed algorithm has been implemented in C++ and some illustrative examples are presented to show the practical strength of the algorithm.
허준영 한국기술교육대학교 2003 論文集 Vol.10 No.1
An estimation technique called the Extended Kalman Filter is used to estimate viscous friction, coulomb friction, and the spring constant on the swash plate of a variable displacement pump. The feasibility of the approach was established using a simulation study. It showed that these parameters could be estimated very accurately in a reliable and independent fashion. A special experimental system was set up to facilitate the measurement of certain states to enhance the Kalman Filtering approach. The aforementioned parameters were estimated and found to be reasonably repeatable for a common operating point. It was very evident that as the operating conditions changed (i.e. temperature) so did the estimated values of certain parameters such as viscous friction. This was believed to be a good verification test for the approach.
유소영,박찬영,정석,김동익,이병붕,허세호,한동철,장준근 대한혈관외과학회 2002 Vascular Specialist International Vol.18 No.2
Purpose: The spreading, orientation, and chemotaxis the gradient of a chemoattractant of smooth muscle cells (SMCs) were studied on the micro-grooved substrata by the light, fluorescence and scanning electron microscopy. Method: Vertical-walled grooves were produced in silicon wafers by the micromachining technique. All grooves were 4~20㎛ deep and 10~80㎛ wide, SMCs were cultured on each microgroove and examined under stereo-microscope. Result: Cell clusters were markedly oriented by all the grooved substrata examined. Tim-lapse images acquired from CCD (Charge Coupled Device) showed that the grooves directed the migration of SMCs. There was no prominent difference in the migration speed of SMCs according to the grooves. All the cytoskeletal fibers were reoragnized in the same direction with grooves. Especially the alignments of microtubule and intermediate filaments were distinguished in the SMCs on the micro grooves. Conclusion: These results could be applied to the analysis of vascular restenosis and the development of artificial blood vessels.
조재문,허준영 한국기술교육대학교 2004 論文集 Vol.10 No.2
The powershift transmission have the advantage of easier operation and higher efficiency by using the hydraulic clutch and mechanical power transfer system. It is important to control the engaging pressure and time. The hydraulic control system is used for these controls of the modulator valve, the accumulator, the sump valve and etc. This study has made a simulator for verifying the pressure characteristic of the shuttle powershift transmission and developed a computer simulation model of the hydraulic components and system by using 'AMESim'. As a result, the design parameters which have an effect on the pressure modulation are verified to the spring stiffness of the modulator valve and the volume of the accumulator.
이식형 제세동기를 위한 Flyback Converter의 출력보상
卞咭浩,劉永善,李祥準,李鐘雨,金正國,許雄 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-
On the occasion of sudden cardiac fibrillation, it is critical to use the defibrillator which delivers electrical energy across the patient's chest, in short time. Since the capacitor and battery inside 1CD(implantable cardioverter/defibrillator) degrade according to the increase of usage and time, the charging time of capacitor becomes prolonged, in order to compensate the prolonged charging time, we propose an algorithm which controls the charging time by changing frequency and duty cycle of feeding pulses to the input of flyback converter.