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임홍석,김성민 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
The longitudinal length variation for rotating axis can be found in pullback device of the Intravascular ultrasound system (IVUS) which is a medical device. For the design of pullback device in intravascular ultrasound system, we have developed a mechanism which is possible the longitudinal length variation in the axis of high-speed rotation as more than 30 times per second. The mechanism prevents the folding and bending of the signal connection line employing helix structures in longitudinal length variation. In the study, We present the longitudinal length variation mechanism for rotating shaft as be able to improve the disadvantage of the existing commercial pullback devices and is to design a pullback device using this mechanism. Also, using the helix structure, this study proposes the mechanism to minimize bending of rotating axis that can occur when the longitudinal length of the axis of rotation is varied.
Ischemia-based Coronary Revascularization: Beyond Anatomy and Fractional Flow Reserve
임홍석,서경우,윤명호,양형모,탁승제 대한심장학회 2018 Korean Circulation Journal Vol.48 No.1
Treatment strategies for patients with coronary artery disease (CAD) should be based on objective evidence of inducible ischemia in the subtended myocardium to improve clinical outcomes, symptoms, and cost-effectiveness. Fractional flow reserve (FFR) is the most verified index to-date for invasively evaluating lesion-specific myocardial ischemia. Favorable results from large clinical trials that applied FFR-guided percutaneous coronary intervention (PCI) prompted changes in coronary revascularization guidelines to emphasize the importance of this ischemia-based strategy using invasive coronary physiology. However, the frequency of functional evaluations is lacking in daily practice, and visual assessment still dominates treatment decisions in CAD patients. Despite recent efforts to integrate functional and anatomical assessments for coronary stenosis, there is considerable discordance between the 2 modalities, and the diagnostic accuracy of simple parameters obtained from current imaging tools is not satisfactory to determine functional significance. Although evidence that supports or justifies anatomy-guided PCI is more limited, and FFR-guided PCI is currently recommended, it is important to be aware of conditions and factors that influence FFR for accurate interpretation and application. In this article, we review the limitations of the current anatomy-derived evaluation of the functional significance of coronary stenosis, detail considerations for the clinical utility of FFR, and discuss the importance of an integrated physiologic approach to determine treatment strategies for CAD patients.
임홍석,유홍희 한국소음진동공학회 2002 한국소음진동공학회 논문집 Vol.12 No.10
A modeling method for the dynamic characteristic analysis of a translationally accelerated trapezoidal cantilever plate is presented in this paper. The equations of motion for the plate are derived and transformed into a dimensionless form. The effects of the inclination angles and the acceleration on the vibration characteristics of the plate are investigated. Incidentally, natural frequency loci veering and associated mode shape variations are observed and discussed.