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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Biomedical Engineering Research
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Journal DOI :
The Korea Society of Medical and Biological Engineering
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Volume & Issues
Volume 34, Issue 4 - Dec 2013
Volume 34, Issue 3 - Sep 2013
Volume 34, Issue 2 - Apr 2013
Volume 34, Issue 1 - Feb 2013
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Effect of Basal Physical Fitness and ADL Function in the Aged According to Horse Riding Exercise
Kim, E.R. ; Kang, S.R. ; Yu, C.H. ; Moon, D.A. ; Park, S.Y. ; Kwon, T.K. ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 163~169
DOI : 10.9718/JBER.2013.34.4.163
The purpose of this study was to verify exercise effect of horse riding exercise according to estimate basal physical fitness and activities of daily living(ADL) function in the aged. Participants were nineteen peoples who have no impediment of activity. They performed horse riding exercise using SRider(Neipplus, Co., Korea) at sixty minutes a day. Exercise has progressed three days a week for eight weeks. We measured trunk flexion, sit up, whole body reaction, leg strength and maximal oxygen uptake as basal physical fitness. Also three meter gait, single stance with eyes opened and single stance with eyes closed as ADL function were estimated once a month. The result of legs strength and whole body reaction showed the higher significantly than before the exercise. Moreover, the result of three meter walking ability only increased significantly among the ADL function. This means that horse riding exercise might be activated continuous muscular contraction with maintained tonus of muscle. We thought that continuous movement of horse riding could be lead to isometric muscle contraction in lower limbs. Our study found that horse riding exercise could improve lower strengths and muscle reaction for exercise effect. Also we suggested that horse riding exercise could be adapted to exercise methods that could provide rehabilitation and treatment enough for the aged or disabled person.
Development of Quantitative Lymphedema Screening System to Monitor Change in Skin Elasticity through the Measurement of Indentation Force and Return Time
Seo, Jong Hyun ; Cho, Chang Nho ; Kim, Sung Chun ; Chung, Seung Hyun ; Koh, Eun Sil ; Kim, Kwang Gi ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 170~176
DOI : 10.9718/JBER.2013.34.4.170
Lymphedema is a phenomenon in which fluid is accumulated inside tissues due to the damaged lymphatic systems. Lymphedema can cause complications such as lymphangitis, infection, changes in skin texture, fibrosis, and lymphangiosarcoma. In this study, a lymphedema screening system based on the elasticity of the skin is proposed to easily quantify lymphedema. The developed probe consists of touch sensors, a load cell and hall-effect sensors to measure the indentation force on the skin and the return time of the skin. The developed system can be used to estimate the change in the elasticity of the skin to quantify lymphedema. The system was tested with a thyroid phantom and gelatin phantoms of different concentrations and the resulting force and the time were recorded. It was found that the increase in the elasticity leads to a higher indentation force and shorter return time. This shows that the developed system can monitor the change in the skin elasticity by measuring the return time and the indentation force. The feasibility of the system in clinical applications will be evaluated in the future study.
Modulation in Action Potentials of Rat Hippocampal Neurons Measured on Multi-Channel Electrodes During Ultrasound Stimulation
Han, H.S. ; Jeon, H.J. ; Hwang, S.Y. ; Lee, Y.N. ; Byun, K.M. ; Jun, S.B. ; Kim, T.S. ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 177~181
DOI : 10.9718/JBER.2013.34.4.177
It is known that ultrasound affects action potentials in neurons, but the underlying principles of ultrasonic neural stimulation are not clearly elucidated yet. In this study, we measured the action potentials of rat hippocampal neurons cultured on multi-electrode arrays during ultrasound stimulation. From most of electrodes, it was observed that the ultrasound stimulation increased the frequencies of action potentials (i.e., spikes) during ultrasound stimulation.
Time Domain of Algorithm for The Detection of Freezing of Gait(FOG) in Patients with Parkinson's Disease
Park, S.H. ; Kwon, Y.R. ; Kim, J.W. ; Eom, G.M. ; Lee, J.H. ; Lee, J.W. ; Lee, S.M. ; Koh, S.B. ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 182~188
DOI : 10.9718/JBER.2013.34.4.182
This study aims to develop a practical algorithm which can detect freezing of gait(FOG) in patients with Parkinson's disease(PD). Eighteen PD patients(
) participated in this study, and three(
) of them showed FOG. We suggested two time-domain algorithms(with 1-axis or 3-axes acceleration signals) and compared them with the frequency-domain algorithm in the literature. We measured the acceleration of left foot with a 3-axis accelerometer inserted at the insole of a shoe. In the time-domain method, the root-mean-square(RMS) acceleration was calculated in a moving window of 4s and FOG was defined as the periods during which RMS accelerations located within FOG range. The parameters in each algorithm were optimized for each subject using the simulated annealing method. The sensitivity and specificity were same, i.e.,
for the time-domain method with 1-axis acceleration and were
for the time-domain method with 3-axes acceleration, respectively. Both performances were better in the time-domain methods than in the frequency-domain method although the results were statistically insignificant. The amount of calculation in the time-domain method was much smaller than in the frequency-domain method. Therefore it is expected that the suggested time domain algorithm would be advantageous in the systematic implementation of FOG detection.
Characterization of Dielectrophoretic Force for the Structural Shapes of Window in Microfluidic Dielectrophoretic Chip
Lee, Jaewoo ; Kwak, Tae Joon ; Yoon, Dae Sung ; Lee, Sang Woo ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 189~196
DOI : 10.9718/JBER.2013.34.4.189
Dielectrophoresis(DEP) is useful in manipulation and separation of micro-sized particles including biological samples such as bacteria, blood cells, and cancer cells in a micro-fluidic device. Especially, those separation and manipulation techniques using DEP in combination of micro fabrication technique have been researched more and more. Recently, it is revealed that a window structure of insulating layer in microfluidic DEP chip is key role in trap of micro-particles around the window structure. However, the trap phenomenon-driven by DEP force gradient did not fully understand and is still illusive. In this study, we characterize the trap mechanism and efficiency with different shapes of window in a microfluidic DEP chip. To do this characterization, we fabricated 4 different windows shapes such as rhombus, circle, squares, and hexagon inside a micro-fluidic chip, and performed micro-sized particles manipulation experiments as varying the frequency and voltage of AC signal. Moreover, the numerical simulation with the same parameters that were used in the experiment was also performed in order to compare the simulation results and the experimental results. Those comparison shows that both results are closely matched. This study may be helpful in design and development of microfluidic DEP chip for trapping micro-scaled biological particle.
Asymmetry of The Reaction Forces on Thighs and Feet During Sit-to-Stand Movement in Normal Subjects
Jeong, H.Y. ; Kim, J.W. ; Kwon, Y.R. ; Seo, B.K. ; Eom, G.M. ; Kim, K.S. ; Lee, J.H. ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 197~203
DOI : 10.9718/JBER.2013.34.4.197
The purpose of this study was to analyze the asymmetry of the reaction forces on lower limbs between dominant and nondominant sides during sit-to-stand movement in normal subjects. Fourteen normal subjects (
, all men) participated in this study. To measure the reaction forces during sit-to-stand movement, two force plates were mounted on the ground and one dual top force plate was mounted on a chair. Five events(movement onset, max thigh reaction force, transition, max hip angle, seat off) were determined from the reaction force and joint angle trajectories. For each of thigh, foot, and total reaction forces, two-way ANOVA was performed with the events and sides as factors. Also investigated was the leg asymmetry expressed as the ratio of the reaction forces of dominant and nondominant sides. The significance of asymmetry was investigated and two-way ANOVA was performed with the events and body parts(foot, thigh and total) as factors. Thigh reaction force and total reaction force showed interaction of events and leg sides(p < 0.01). Post-hoc comparisons showed they were different between sides at the latter stage(transition, max hip angle, and seat off events) (p < 0.01). Asymmetry was also significant at the latter stage(transition, max hip angle, and seat off events) (p < 0.01). Interaction of events and body parts on asymmetry was significant(p < 0.01) and asymmetry was greater in thigh reaction forces than total and foot reaction forces at the events of the latter stage(p < 0.01). The results suggest that asymmetry exist in normal subject and should be fully considered when investigating sit-to-stand strategy of patients.
Development and Implementation of Noise-Canceling Technology for Digital Stethoscope
Lee, Keunsang ; Ji, Youna ; Jeon, Youngtaek ; Park, Young Chool ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 204~211
DOI : 10.9718/JBER.2013.34.4.204
In this paper, an algorithm for suppressing acoustic noises contained in stethoscope sound is proposed and implemented in real-time using an embedded DSP system. Sound collected by stethoscope is down-sampled and band-pass filtered, and later an NLMS adaptive filter is used to cancel the acoustic noise induced from external noise sources. Also, the unpredictable impulsive noises due to fabric friction and instantaneous tapping are detected using the SD-ROM algorithm, and suppressed using an algorithm approximating the morphology filter. The proposed algorithm was tested using signals collected with a digital stethoscope mockup, and implemented on an ARM920T-based DSP system.
Characteristics of Balance and Muscle Activation responded to Dynamic Motions in Anterior-Posterior and Medial-Lateral Directions
Kim, ChoongYeon ; Jung, HoHyun ; Lee, BumKee ; Jung, Dukyoung ; Chun, Kyeong Jin ; Lim, Dohyung ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 212~217
DOI : 10.9718/JBER.2013.34.4.212
Falling is one of the major public problems to the elderly, resulting in limitations of daily living activities. It can be induced by the functional loss of the balance ability and muscle strength in the elderly. It has been, however, not well investigated to suggest an effective methodology improving the balance ability and muscle strength for the prevention of the falling due to lack of information about the characteristics of the balance and muscle activations responded to the dynamic motions. The aim of the current study is, therefore, to identify the characteristics of the balance and muscle activations responded to the dynamic motions in Anterior-Posterior(AP) and Medial Lateral(ML) directions. For that, a motion capture system with eight infrared cameras, surface electromyogram system and Wii Fit system with a customized variable unstable base were used and kinematic and kinetic data obtained from the systems were analyzed for five healthy male(
). The results showed that the characteristics of the balance and muscle activations were differently responded to between the dynamic motions in Anterior-Posterior(AP) and Medial Lateral(ML) directions. These findings may indicate that customized dynamic motions should be applied to the training of the balance ability and muscle strength for the effective prevention of the falling. This study may be meaningful to providing basic information to establish a guideline improving effectively the balance ability and muscle strength.
A study on Hair Bundle Feature Estimation Based on Negative Stiffness Mechanism Using Integrated Vestibular Hair Cell Model
Kim, Dongyoung ; Hong, Kihwan ; Kim, Kyu-Sung ; Lee, Sangmin ;
Journal of Biomedical Engineering Research, volume 34, issue 4, 2013, Pages 218~225
DOI : 10.9718/JBER.2013.34.4.218
In this paper hair bundle feature model and integration method for hair cell models were proposed. The proposed hair bundle feature model was based on spring-damper-mass model. Input of integrated vestibular hair cell model was frequency and output was interspike interval of hair cell that was reflected the feature of hair bundles. Irregular afferents that had a great gain variation showed reduction of negative stiffness section. Regular afferents that had a small gain variation, however, showed same feature with base negative stiffness feature. As a result, integrated vestibular hair cell model showed almost the same modeling data with experimental data in the modeled eleven frequency bands. It is verified that the proposed model is a good model for hair bundle feature modeling.