Youn-Ho Kim

Motion artifact reduction in electrocardiogram using adaptive filtering based on half cell potential monitoring

The electrocardiogram (ECG) is the main measurement parameter for effectively diagnosing chronic disease and guiding cardio-fitness therapy. ECGs contaminated by noise or artifacts disrupt the normal functioning of the automatic analysis algorithm. The objective of this study is to evaluate a method of measuring the HCP variation in motion artifacts through direct monitoring. The proposed wearable sensing device has two channels. One channel is used to measure the ECG through a differential amplifier. The other is for monitoring motion artifacts using the modified electrode and the same differential amplifier. Noise reduction was performed using adaptive filtering, based on a reference signal highly correlated with it. Direct measurement of HCP variations can eliminate the need for additional sensors.

Production efficiencies of Kr*(1s5,1s4) atoms leading to vacuum-ultraviolet emissions in ac plasma display panels with Kr-Ne binary mixtures measured by laser-absorption spectroscopy

Ne–Kr gas mixtures with high Kr concentrations were applied to ac plasma display panels. Spatiotemporal behaviors of excited Kr atoms in the 1s5 metastable state and the 1s4 resonance state were measured by microscopic laser-absorption spectroscopy in the binary mixtures with Kr concentrations of 20% and 40%. A systematic comparison was done between the characteristics of Ne–Kr-filled panels and those of conventional Ne–Xe panels with the same structure but with lower Xe concentrations of 5% and 10%. For example, the total number of Kr*(1s5) atoms in a unit cell ranged from 7.4×107 to 2.0×108, at the peak was apparently smaller than the value of Xe*(1s5) atoms. However, when the difference in the decay rate of the excited atoms by three-body collision processes is taken into account, the production efficiency of vacuum-ultraviolet (VUV) emission from Kr2* excimers is as large as that from Xe2* excimers in a usual panel since these processes lead directly to the formation of excimers. From the measured den...

A PD control-based QRS detection algorithm for wearable ECG applications

We present a QRS detection algorithm for wearable ECG applications using a proportional-derivative (PD) control. ECG data of arrhythmia have irregular intervals and magnitudes of QRS waves that impede correct QRS detection. To resolve the problem, PD control is applied to avoid missing a small QRS wave followed from a large QRS wave and to avoid falsely detecting noise as QRS waves when an interval between two adjacent QRS waves is large (e.g. bradycardia, pause, and arioventricular block). ECG data was obtained from 78 patients with various cardiovascular diseases and tested for the performance evaluation of the proposed algorithm. The overall sensitivity and positive predictive value were 99.28% and 99.26%, respectively. The proposed algorithm has low computational complexity, so that it can be suitable to apply mobile ECG monitoring system in real time.

P-50: Excimer Gas Discharge Characteristics for Color AC-PDPs

We present the discharge characteristics of a rare gas halide mixture in AC- Plasma Display Panels. Studies for excimer gas of plasma display panels are performed using XeF. This excimer gas is investigated as function of its pressure and different discharge condition. In this paper, the real panel using XeF excimer gas is researched for good discharge characteristics and a full-color panel is demonstrated.

40.1: Invited Paper: The Dual Coplanar Electrode Mercury Free Flat Fluorescent Lamp

The authors introduce a dual coplanar electrode flat fluorescent lamp, which is basically the sum of two coplanar electrode lamps, one having the electrodes on the front plate and the other on the bottom plate. It has the same level of discharge stability as that in a usual coplanar lamp. And the results also indicate that the brightness and luminous efficacy improve largely for a dual coplanar lamp compared to a coplanar lamp because there is less diffusion loss for the dual coplanar lamp.

Implementation of Measuring Bio-signals Simultaneously using Time-Sharing Method

In this paper, we propose a measuring device implementation to measure ECG, 50 KHz BIA for getting BIA/respiration, and 10~50 Hz GSR for measuring electrical characteristics of skin. To this end, BIA signal is separated by line filter and high impedance element and the interference between signals could be minimized by switching in time domain to separate ECG and GSR signals having the similar frequency range. ECG, heart rate and respiration are measured by the simulator based on the implemented circuit and BIA and GSR impedance are verified using standard resistance. Also, we made an experiment this method to human body and found the possibility of detecting bio-signals

Design of the PCB embedded active IC structure for ultra-thin wearable application with low-RFI

The ultra-thin design is essentially required for mobile and wearable applications, while the multiple operations are needed to be integrated in tiny space of the product. For achieving ultra-thin design and low radio-frequency interference (RFI) characteristics, the PCB embedded active IC structure was proposed in previous studies. However, there were limitations for fabricating the structure: one is difficulty to test, the other is high cost of the process, and the other is still exposure to RFI. In this paper, we propose the structure that can be fabricated by using normal PCB process with an anisotropic conductive film (ACF) bonding. The structure, which we propose, can overcome the limitations of the previous PCB embedded active IC structure. Among limitations, RFI could be effectively reduced by noise field reduction of radiation and conduction. The shielding effectiveness is key factor for reducing radiated field coupling, and signal integrity (SI) and power integrity (PI) factors, such as crosstalk and PDN mode resonance is critical factor for reducing conducted field coupling.

Development of an anaerobic threshold (HRLT, HRVT) estimation equation using the heart rate threshold (HRT) during the treadmill incremental exercise test

[Purpose] The purpose of this study was to develop a regression model to estimate the heart rate at the lactate threshold (HRLT) and the heart rate at the ventilatory threshold (HRVT) using the heart rate threshold (HRT), and to test the validity of the regression model. [Methods] We performed a graded exercise test with a treadmill in 220 normal individuals (men: 112, women: 108) aged 20–59 years. HRT, HRLT, and HRVT were measured in all subjects. A regression model was developed to estimate HRLT and HRVT using HRT with 70% of the data (men: 79, women: 76) through randomization (7:3), with the Bernoulli trial. The validity of the regression model developed with the remaining 30% of the data (men: 33, women: 32) was also examined. [Results] Based on the regression coefficient, we found that the independent variable HRT was a significant variable in all regression models. The adjusted R2 of the developed regression models averaged about 70%, and the standard error of estimation of the validity test results was 11 bpm, which is similar to that of the developed model. [Conclusion] These results suggest that HRT is a useful parameter for predicting HRLT and HRVT.

An ultra-low power (ULP) bandage-type ECG sensor for efficient cardiac disease management

This paper proposed an ultra-low power bandage-type ECG sensor (the size: 76×34×3 (mm3) and the power consumption: 1 mW) which allows for a continuous and real-time monitoring of a users ECG signals over 24h during daily activities.

Luminous efficacy of Kr mixtures at 6" AC-PDP

Summary form only given, as follows. In this paper, we investigated the factors that can influence the address time and especially, electric field effects and priming particle effects are compared to achieve a high speed addressing and finally, the address characteristics of high Xe contents panel are investigated The test panel used in this experiment has the conventional coplanar structure with three electrodes and stripe type barrier rib with VGA resolution and filled with Ne-Xe 4%, 8%, and 12% 400 Torr gas mixture each.