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MR댐퍼 솔레노이드 밸브의 자성체 재질특성에 따른 차량 거동 및 진동감쇠 효과에 대한 연구
강경호,박종덕 대한전기학회 2024 전기학회논문지 Vol.73 No.7
In this paper, we calculate and analyze the effects of the magnetization characteristics of the solenoid valve of the MR damper on the generation of damping force and the vehicle. First, to calculate the damping force of the MR damper, an analytical calculation program based on MATLAB/GUI is combined with a finite element analysis that can consider geometrical shape and magnetization characteristics. Second, the magnetization characteristics of various magnetic material candidates are measured through experiments. Third, in order to verify the consistency of the damping force characteristics for each speed obtained through analysis, it is compared with the test results measured by the damper test equipment. Finally, the calculated damping force characteristics are combined with the vehicle dynamics model to analyze the vehicle's driving behavior and vibration under various road conditions. After analyzing vehicle behavior and vibration damping effects depending on the magnetic material, a magnetic material suitable for the MR damper is finally proposed.
Fluorescence imaging, an emerging tool for preserving the parathyroid glands during thyroidectomy
강경호 대한내시경로봇외과학회 2022 Journal of Minimally Invasive Surgery Vol.25 No.3
With vocal cord palsy, hypoparathyroidism is one of the two major complications after thyroid surgery. Traditional approaches to preserving the parathyroid glands during thyroid surgery include identifying the glands precisely and preserving their vasculature with the naked eye, which mainly depend on the experience and skill of the surgeon. Recently, a relatively new technique, f luorescence image-guided surgery, has been widely researched and is becoming increasingly popular. The authors present a video clip of transoral robotic total thyroidectomy, which shows the three typical statuses of the parathyroid glands after thyroid surgery (well-perfused, poorly or non-perfused, and congested) and explains how to deal with each status of the parathyroid glands.