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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 32, Issue 4 - Dec 2011
Volume 32, Issue 3 - Sep 2011
Volume 32, Issue 2 - Apr 2011
Volume 32, Issue 1 - Feb 2011
Selecting the target year
Enhanced Undergraduate Software Education Curriculum for Biomedical Engineering: a Proposal for a New Class
Park, Hyun-Jin ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 279~284
DOI : 10.9718/JBER.2011.32.4.279
Biomedical engineering is a discipline where engineering principles and techniques are applied to the medical field. Biomedical engineering lies between traditional engineering and medicine and is an inter-disciplinary field in its nature. Current Korean undergraduate biomedical engineering curriculum is a simple list of traditional engineering courses combined with basic medical/life science courses. There have been efforts to improve biomedical engineering education to reflect its inter-disciplinary nature. Enhanced software course for biomedical engineering is proposed as a part of effort to overhaul the undergraduate biomedical engineering curriculum. In this newly proposed course, students will learn MATLAB and LabVIEW, which are the most widely used software tools in biomedical engineering.
Handheld OCT probe for Evaluation of Tympanic Membrane Status
Kwon, Hyeong-Il ; Kim, Yee-Hyuk ; Cho, Nam-Hyun ; Jeong, Hyo-Sang ; Kim, Jee-Hyun ; Lee, Sang-Heun ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 285~288
DOI : 10.9718/JBER.2011.32.4.285
In this study, we developed an optical coherence tomography(OCT) using a sweep-source laser whose center wavelength is 1310 nm and a probe of hand-held type. The developed hand-held probe targets to diagnose the middle ear, so it is miniaturized for ease and convenience of control. For the first time, we performed in-vivo clinical experiments on tympanic membrane(TM) perforation patients not reported from previous studies about OCT. The high-resolution sectional images of tympanic membrane perforation can be obtained. There aren`t many studies about diagnostic instrument of the middle ear and diagnosis with sectional image of the middle ear, so the developed OCT system and hand-held probe are applicable to tympanic membrane perforation and other pathologic diagnosis in the middle ear.
A proposal for Biomedical Engineering Laboratory Class as a Part of a Novel Curriculum for Biomedical Engineering Education
Park, Hyun-Jin ; Chee, Young-Joon ; Seo, Jong-Bum ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 289~294
DOI : 10.9718/JBER.2011.32.4.289
Laboratory class is an integral part of biomedical engineering education. Current biomedical engineering curriculum in Korea mostly includes mandatory laboratory classes. Most of the Korean biomedical laboratory classes focus on electrical engineering aspects, while molecular/biological engineering aspects are neglected. Many leading universities in U.S.A. offer a more balanced laboratory class where both electrical engineering aspects and molecular/biological engineering aspects are considered. As a part of an effort to enhance undergraduate biomedical engineering education, a new biomedical engineering laboratory class is proposed to offer a more balanced laboratory learning experience.
Accuracy Comparison of Motor Imagery Performance Evaluation Factors Using EEG Based Brain Computer Interface by Neurofeedback Effectiveness
Choi, Dong-Hag ; Ryu, Yon-Su ; Lee, Young-Bum ; Min, Se-Dong ; Lee, Myoung-Ho ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 295~304
DOI : 10.9718/JBER.2011.32.4.295
In this study, we evaluated the EEG based BCI algorithm using common spatial pattern to find realistic applicability using neurofeedback EEG based BCI algorithm - EEG mode, feature vector calculation, the number of selected channels, 3 types of classifier, window size is evaluated for 10 subjects. The experimental results have been evaluated depending on conditioned experiment whether neurofeedback is used or not In case of using neurofeedback, a few subjects presented exceptional but general tendency presented the performance improvement Through this study, we found a motivation of development for the specific classifier based BCI system and the assessment evaluation system. We proposed a need for an optimized algorithm applicable to the robust motor imagery evaluation system with more useful functionalities.
Changes in Distribution of Electrical Field in tDCS with Ring Electrode Due to Tissue Anisotropy: a 3D High Resolution Finite Element Head Model Study
Kim, Sang-Hyuk ; Suh, Hyun-Sang ; Cho, Young-Sun ; Lee, Won-Hee ; Kim, Tae-Seong ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 305~311
DOI : 10.9718/JBER.2011.32.4.305
For effective stimulation with tDCS, spatial focality of induced electrical field(EF) and current density(CD) is one of the important factors to be considered. Recently, there have been some studies to improve the spatial focality via different types of electrodes and their new configurations: some improvements using ring electrodes were reported over the conventional pad electrodes. However, most of these studies assumed isotropic conductivities in the head. In this work, we have investigated the effect of tissue anisotropy on the spatial focality of tDCS with the 4 + 1 ring electrode configuration via a 3-D high-resolution finite element(FE) head model with anisotropic conductivities in the skull and white matter. By examining the profiles of the induced EF from the head models with isotropic and anisotropic conductivities respectively, we found that the spatial focality of the induced EF significantly drops and get diffused due to tissue anisotropy. Our analysis suggests that it is critical to incorporate tissue anisotropy in the effective stimulation of the brain via tDCS.
A Comparative Evaluation about Force and Fatigue on Thumb according to Input Type for Repetitive Use of Mobile Phone
Kim, K.M ; Park, J.H. ; Kim, G.H. ; Son, K. ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 312~318
DOI : 10.9718/JBER.2011.32.4.312
The purpose of study was to evaluate effects for repetitive use of thumb according to two different input types (button and touch) of mobile phones. A total of eight young and healthy subjects (6 males and 2 females:
years) volunteered, and force measurement on thumb using film type pressure sensor was carried out for an hour. Before the experiment De Quervain`s syndrome test were performed to check the left and right muscles related with thumb motion and after measuring the pressing force fatigue feeling survey achieved. For a statistical analysis, 1-to-5 ranking scale was used to score the fatigue feeling. From the result of pressure measurement, forces acting on thumb in button type were 3.36 times (the right thumb) and 3.16 times (the left thumb) for the touch type. And the result of survey, fatigue by using the button type of mobile phone was largely triggered than by using touch type. The abductor pollicis brevis and the flexor pollicis brevis were found as common part of fatigue for repetitively using thumb during texting messages. In the further study, some quantitative fatigue comparisons for various input motions are required to analyze repetitive strain injury syndrome.
Muscle Fatigue Analysis Based on Electromyography Signals for The Evaluation of Low-Level Laser Therapy
Kim, Ji-Hyun ; Choi, Hyo-Hoon ; Youn, Jong-In ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 319~327
DOI : 10.9718/JBER.2011.32.4.319
Skeletal muscle fatigue is defined as a `any reduction in the maximal capacity to generate force or power output`, and is the reduction of oxygen consumption and by-product of metabolism. For the muscle fatigue therapy, low level laser has been introduced that leads the mitochondrial respiratory and attributes the muscle fatigue recovery. This study analyzed the muscle fatigue signals from electromyography(EMG) during low-level laser therapy (LLLT). Healthy subjects performed voluntary elbow flexion-extension excercise and received placebo LLLT and active LLLT using a 830 nm laser diode. Then, EMG were measured for the evaluation of muscle fatigue. The acquired EMG data were analyzed with median frequency and short time fourier transform methods. The results showed that the LLLT had a significant symptomatic relief of muscle fatigue based on the EMG frequency analysis. Therefore, the muscle fatigue analysis with EMG signals can be applied to quantitative evaluation for the monitoring of LLLT effects.
Evaluation Method of Physical Workload in Overhead Lifting Posture Using Surface EMG Analysis
Lee, Young-Jin ; Chee, Young-Joon ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 328~335
DOI : 10.9718/JBER.2011.32.4.328
For human factor engineering and wearable robot design, the quantitative assessment of physical workload is needed. Through measuring the surface EMG (sEMG) and analysis, the physical workload in overhead lifting posture is presented in quantitative manner. By normalizing sEMG activities with maximal voluntary contraction (MVC), the inter-subject variability is reduced. In all muscles, %MVC increased as the weight of lifting object increases. In anterior deltoid muscle, the %MVC was 3-4 times higher than the other muscles which imply that this muscle performs the major role in the overhead lifting posture. In fatigue analysis, %MVC and the mean frequency in muscle of anterior deltoid changed markedly when compared with other muscles. Through the suggested procedures and analysis, the physical workload for a specific posture can be represented in quantitative way but the clinical meaning for the value should be investigated further.
Two Wheeler Recognition Using the Correlation Coefficient for Histogram of Oriented Gradients to Apply Intelligent Wheelchair
Kim, Bum-Koog ; Park, Sang-Hee ; Lee, Yeung-Hak ; Lee, Gang-Hwa ;
Journal of Biomedical Engineering Research, volume 32, issue 4, 2011, Pages 336~344
DOI : 10.9718/JBER.2011.32.4.336
This article describes a new recognition algorithm using correlation coefficient for intelligent wheelchair to avoid collision for elderly or disabled people. The correlation coefficient can be used to represent the relationship of two different areas. The algorithm has three steps: Firstly, we extract an edge vector using the Histogram of Oriented Gradients(HOG) which includes gradient information and unique magnitude for each cell. From this result, the correlation coefficients are calculated between one cell and others. Secondly, correlation coefficients are used as the weighting factors for normalizing the HOG cell. And finally, these features are used to classify or detect variable and complicated shapes of two wheelers using Adaboost algorithm. In this paper, we propose a new feature vectors which is calculated by weighted cell unit to classify with multiple view-based shapes: frontal, rear and side views(
and mixed angle). Our experimental results show that two wheeler detection system based on a proposed approach leads to a higher detection accuracy than the method using traditional features in a similar detection time.