Hang-Sik Shin
Samsung
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Publication
Featured researches published by Hang-Sik Shin.
Archive | 2007
Hang-Sik Shin; Chungkeun Lee; Myoungho Lee
Electrocardiogram provides critical information about the cardiovascular system. For diagnosis, medical doctors consider the duration, slope and peak amplitude between principal points of an electrocardiogram. Therefore, as a first step, it is very important to find essential points of an electrocardiogram - P, Q, R, S, and T. In this paper, we propose a simple PQRST detection algorithm based on peak-detection and timing analysis, and also we use 8 MIT-BIH databases that have definite R-peak for algorithm testing. In normal cases, the proposed algorithm worked with high accuracy. However, the proposed algorithm has propagation error because of its in order characteristic.
Journal of Biomedical Engineering Research | 2011
Chungkeun Lee; Hang-Sik Shin; In-Deok Kong; Myoun-Ho Lee
Assuming that photons absorbed by a vessel do not have acute variations, DC component reflect the basal blood volume (or diameter) before blood pulsation. Vascular stiffness and reflection is influenced by changes in basal blood volume (or diameter). This paper describes analysis of the characteristic variations of vascular stiffness, according to relative variations in DC components of the PPG signal (25-75%). For quantitative analysis, we have used parameters that were proposed previously, reflection and stiffness index, and the second derivative of PPG waveform, b/a and d/a. Significantly, the vascular stiffness and reflections were increased according to increase in DC component of the PPG signal for more than about 3% of baseline values. The systolic blood pressure were increased from to mmHg, about 2.76% (r
The Transactions of the Korean Institute of Electrical Engineers | 2016
Hang-Sik Shin; Hoon Sik Kim
The purpose of this research is to investigate the effect of sampling frequency on the photoplethysmography (PPG) and to evaluate the performance of interpolation methods for under-sampled PPG. We generated down-sampled PPG using 10 kHz-sampled PPG then evaluated waveshape changes with correlation coefficient. Correlation coefficient was significantly decreased at 50 Hz or below sampling frequency. We interpolated the down-sampled PPG using four interpolation method–linear, nearest, cubic spline and piecewise cubic Hermitt interpolation polynomial – then evaluated interpolation performance. As a result, it was shown that PPG waveform that was sampled over 20 Hz could be reconstructed by interpolation. Among interpolation methods, cubic spline interpolation showed the highest performance. However, every interpolation method has no or less effect on 5 Hz sampled PPG.
Archive | 2007
Hang-Sik Shin; Chungkeun Lee; Jung Hyuk Kim; Myoungho Lee
Most of the critical issues of cardiac pacemakers and ICDs are the device size and power consumption problem. Because devices size for cardiac implant is limited, we always have to consider trade-off relationship between size and longevity. Accordingly, we proposed a MAC-sharing structure based on FPGA platform for small size and low power consumption. The MAC-sharing structure contains a single multiplier using a time division method, hence we reduce a system complexity and power consumption with this method. In this paper, we show the result of atrial fibrillation detection using the proposed structure based on a FPGA platform.
Archive | 2007
Chungkeun Lee; Hang-Sik Shin; Yong-Ho Kim; Yong-Jun Kim; Myoungho Lee
As a method of observing regeneration of damaged nerves, research is being conducted on analyzing the electric signals of nerve fibers that regenerate damaged nerves by implanting a microelectrode array between those nerves[1,3]. There are methods that evaluated for regerated nerves, such as electrophysiology test(nerve conduction velocity, morphology, maximum amplitude), function analysis(i.e gait analysis for sciatic nerves), and histological test. For electrophysiology test, there are needed exactly spike detection(positive phase and negative phase). ENG’s bandwidth has the broader than other biomedical signals. Therefore, procedure of biomedical signal processing requested many computation quantities. In this paper, we proposed the simplified system for conduction velocity regenerated nerve, based on MEA, without signal processing complexity.
Archive | 2014
Jae-Woo Ko; Hang-Sik Shin; Se-Jun Park
Archive | 2013
Hang-Sik Shin; Sung-Joo Ahn; Jung-Hoon Park; Hyun-Guk Yoo
Archive | 2012
Hang-Sik Shin; Jung Hoon Park; Hyun Gok Yoo; Sung-Joo Ahn
Archive | 2013
Hang-Sik Shin
Archive | 2013
Jae-Woo Ko; Hang-Sik Shin; Se-Jun Park