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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biomedical Engineering Research
Journal Basic Information
Journal DOI :
The Korea Society of Medical and Biological Engineering
Editor in Chief :
Volume & Issues
Volume 35, Issue 6 - Dec 2014
Volume 35, Issue 5 - Oct 2014
Volume 35, Issue 4 - Aug 2014
Volume 35, Issue 3 - Jun 2014
Volume 35, Issue 2 - Apr 2014
Volume 35, Issue 1 - Feb 2014
Selecting the target year
Design of Unconstrained Baby Monitoring System Based on a Doppler Radar and an Air Mattress
Yang, Seong-Soo ; Cho, Sung-Pil ; Park, Ho-Dong ; Lee, Kyoung-Joung ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 177~184
DOI : 10.9718/JBER.2014.35.6.177
Continuous monitoring of heart rates and respiratory rates for newborns or infants is very important since the abnormal breathing and heart problems can threaten the life of newborns or infants. A noncontact baby monitoring system based on a Doppler radar and an air mattress was designed. The Doppler radar was used to acquire respiratory signals and the air mattress was employed to obtain heart rates. The performance of the designed system was evaluated using a commercialized infant simulator (
) and a respiration belt transducer was used to measure respiration rates as a reference. Results for respiratory rates revealed that the correlation coefficients between I-and Q-channel and the respiration belt were 0.84 and 0.91 and the mean
standard deviations of errors between them were
(bpm). Heart rates showed that the correlation coefficient between air mattress and set value of the simulator was 0.73 and the mean
standard deviation of errors between them was
(bpm). These results indicate that the designed system holds the potential as an effective monitoring tool for continuous monitoring heart rates and respiratory rates of newborns or infants.
Research Trend on Cognition Training Method using Computer Software
Lee, Juhyeon ; Oh, Doyeong ; Koo, Kyo-In ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 185~191
DOI : 10.9718/JBER.2014.35.6.185
Mild cognitive impairment is status between healthy people and dementia patients. In order to prevent dementia or slow its progression, cognitive interventions could be effective. In this paper, review of the cognitive intervention with computer software was undertaken. Previous reports showed that the cognitive intervention with additional equipment could practical to the mild cognitive impairment.
Fabrication and Characterization of 3-D Porous Collagen Scaffold
Kim, Jin-Tae ; Lim, Sumin ; Kim, Byoung Soo ; Lee, Deuk Yong ; Choi, Jae Ha ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 192~196
DOI : 10.9718/JBER.2014.35.6.192
Collagen scaffolds were synthesized by cross linking into a solution mixture of 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochlorid(EDC) in ethanol, followed by pressing, cleaning and lyophilization process after the type I atelo-collagen solutions in D.I water(pH3). The experimental conditions are collagen concentration of 1.0 wt%, 3.0 wt%, 5.0 wt% and differential concentration of cross-linker. Then, parametric studies were performed by varying the parameters to investigate the morphology, the porosity, the swelling ratio and the thickness and genotoxicity of the scaffolds. The scaffolds thickness pattern was regular to concentration of the degree of cross-linker and collagen. It was observed that the swelling ratio, the degree of crosslink, and the pore size(thickness of scaffold) can be controlled by adjusting the collagen, crosslinker. Among the parameters investigated, the smallest thickness can be achieved by collagen, crosslinker concentrate condition. The collagen scaffold is induced no genotoxicity. The lowest swelling ratio, as an indication of the highest degree of crosslink, can be obtained by adding crosslink agent.
The Evaluation of the Short-term Stress Effect on Cognitive Rehabilitation Training Assessment
Jang, Ik-Jae ; Youn, Jong-In ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 197~202
DOI : 10.9718/JBER.2014.35.6.197
The cognitive rehabilitation training is important for treating many cognitive impairment conditions, including Parkinson's disease, stroke, and ADHD. In this study, we developed a new evaluation system to improve the measurement of the conventional evaluation systems for cognitive rehabilitation training. The developed system measured the activity of dopamine(DA) and an autonomic nervous system(ANS) with photoplethysmography and electromyography. The results demonstrated that the cognitive capacity was increased but the activity of DA was decreased with unbalanced ANS by short-term stress. Based on the results, the effect of short-term stress should be recognized for the cognitive rehabilitation training.
Adhesive Polyurethane-based Capacitive Electrode for Patch-type Wearable Electrocardiogram Measurement System
Lee, Jeong Su ; Lee, Won Kyu ; Lim, Yong Gyu ; Park, Kwang Suk ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 203~210
DOI : 10.9718/JBER.2014.35.6.203
Wearable medical device has been a resurgence of interest thanks to the development of technology and propagation of smart phone in recent years. Various types of wearable devices have been introduced and available in market. Capacitive coupled electrode which measures electrocardiogram over cloth is able to be applied wearable device. In previous approaches of capacitive electrode, they need proper pressure for stable contact of the electrode to body surface. However, wearable device that gives pressure on body surface is not suitable for long-term monitoring. In this study, we proposed adhesive polyurethane-based capacitive electrode for patch-type wearable electrocardiogram (ECG) monitoring device. Self-adhesive polyurethane make the electrode and whole system be adhered to the surface of skin without any pressure. The patch-type system is consisted of analog filter, analog-to-digital converter and wireless transmission module and designed to be attached on the body as a patch. To validate the feasibility of the developed system, we measured ECG signal in stable and active state and extracted heart rate. Therefore, we observed skin response after long-term attachment for biocompatibility of the adhesive polyurethane and adhesive strength of it. The result shows the possibility of applying the developed system for ECG monitoring in real-life.
Automatic Detection of Slow-Wave Sleep Based on Electrocardiogram
Yoon, Hee Nam ; Hwang, Su Hwan ; Jung, Da Woon ; Lee, Yu Jin ; Jeong, Do-Un ; Park, Kwang Suk ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 211~218
DOI : 10.9718/JBER.2014.35.6.211
The objective of this research is to develop an automatic algorithm based on electrocardiogram (ECG) to estimate slow-wave sleep (SWS). An algorithm is based on 7 indices extracted from heart rate on ECG which simultaneously recorded with standard full night polysomnography from 31 subjects. Those 7 indices were then applied to independent component analysis to extract a feature that discriminates SWS and other sleep stages. Overall Cohen's kappa, accuracy, sensitivity and specificity of the algorithm to detect 30s epochs of SWS were 0.52, 0.87, 0.70 and 0.90, respectively. The automatic SWS detection algorithm could be useful combining with existing REM and wake estimation technique on unattended home-based sleep monitoring.
Development of the Basic Life Support App Including Chest Compression Feedback
Song, Yeongtak ; Kim, Minwoo ; Kim, Jinsung ; Oh, Jaehoon ; Chee, Youngjoon ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 219~226
DOI : 10.9718/JBER.2014.35.6.219
This study is to develop a basic life support (BLS) app using the android based smartphone and to evaluate the function of the app. Suggested app contains chest compression feedback function, the map of automated external defibrillator (AED), direct emergency call and the basic knowledge of BLS. Using the accelerometer of the smartphone, we implemented a real-time algorithm that estimates the chest compression depth and rate for high quality cardiopulmonary resuscitation (CPR). The accuracy of algorithm was evaluated by manikin experiment. We made contents which were easy to learn the BLS for the layperson and implemented a function that provides the AED location information based on the user's current location. From the manikin experiment, the chest compression depth and rate were no significant differences between the manikin data and the app's feedback data (p > 0.05). Developed BLS app was uploaded on Google Play Store and it was free to download. We expected that this app is useful to learn the BLS for the layperson.
Quantitative Rehabilitation Extent Monitoring for Unilateral Lower Extremity Disabled Patients using Simulated Gait Pattern Analysis
Moon, Dong-Jun ; Kim, Ju-Young ; Noh, Si-Cheol ; Choi, Heung-Ho ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 227~233
DOI : 10.9718/JBER.2014.35.6.227
In this paper, to quantitatively evaluate the degree of rehabilitation for the disabled of unilateral lower extremity, we compared the EMG pattern of normal and simulated abnormal gait. The EMG signal was measured at a rate of 1 kHz on the quadriceps and biceps femoris, the pressure sensor was attached to the sole in order to distinguish the gait cycle. Integrated EMG (IEMG) was obtained by the gait cycle, and classified four patterns that were the normal gait pattern, amplitude decrease pattern, reversed pattern, and irregular pattern. For comparison of the patterns, a curve fitting was performed using the trigonometric functions. The result of curve fitting, the method using a variable A that corresponds to the amplitude of the regression curve was able to distinguish the reverse pattern and remaining pattern. The coefficient of determination (
) representing coincidence of the pattern of the regression curve and EMG was confirmed the biggest value at the normal gait. Therefore, the degree of normal gait can be confirmed using the coefficient of determination. This results show that it is possible to quantitatively confirm the degree of unilateral lower extremity disabled rehabilitation, and it will be contributed to the study of efficient rehabilitation methods by objective analysis.
The Effects of the Stimulation Intensity and Inter-Electrode Distance on the Parameters of the Measured Sensory Nerve Signal
Lim, Kyeong Min ; Song, Tongjin ;
Journal of Biomedical Engineering Research, volume 35, issue 6, 2014, Pages 234~241
DOI : 10.9718/JBER.2014.35.6.234
This study was designed to investigate the effects of stimulation intensity and inter-electrode distance on the parameters of the measured sensory nerve signal. 30 healthy subjects participated in this study. Sensory nerve signals were elicited by four different pulse amplitudes, i.e., 3, 6, 9, 12 mA, with the pulse width fixed at
. The sensory nerve signals elicited by the four different pulse amplitudes were measured by four different inter-electrode distances (20, 30, 40, and 50 mm). We extracted four parameters (pulse amplitude, pulse width, pulse area, and latency time from stimulation) from the sensory nerve signals. The measured pulse amplitude and pulse width were increased when the measuring inter-electrode distance was increased while the stimulating pulse amplitude was fixed. The measured pulse amplitude was saturated with the stimulating pulse amplitudes of over 6 mA while measuring inter-electrode distance. Under the same condition, measured pulse width was increased, and sensory nerve signal was initiated early. Sensory nerve signals, specially those of pulse amplitude, were distorted by a differential amplification method that commonly measures the human body signal. The experimental results indicate that the differential amplification method is required to be replaced when measuring nerve signals. Our observations suggested that the hyperpolarization of the action potential of the sensory nerve signal for preventing distortion could be used to clarify the correlation between the parameters of the sensory nerve signals and quantification of sensations.