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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 33, Issue 4 - Dec 2012
Volume 33, Issue 3 - Sep 2012
Volume 33, Issue 2 - Jun 2012
Volume 33, Issue 1 - Mar 2012
Selecting the target year
Development of The Intraoperative Surgical Optical Coherence Tomography Probe
Kim, Kyung-Un ; Lee, Chang-Ho ; Jeong, Hyo-Sang ; Han, Seung-Hoon ; Kim, Hong-Kyun ; Kim, Jee-Hyun ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 53~58
DOI : 10.9718/JBER.2012.33.2.053
Intraoperative surgical microscope is an essential surgical equipment. However, it has a restriction to classify the retina layers because of the contrast differences. To solve this problem, operators use surgical instrument such as an intraocular mirror. In this case, it has to amputate the patient's eye. In this study, we developed a probe the intraoperative surgical optical coherence tomography. We expect that the developed OCT probe can overcome the limit of OCT and be applied as a real-time surgical tool. In this paper, we demonstrate applicability of the probe through rabbit's experimentation.
Cardio-Pulmonary Effects of RF Fields Emitted from WCDMA Mobile Phones
Kwon, M.K. ; Choi, J.L. ; Choi, J.Y. ; Jang, K.H. ; Kim, S.K. ; Kim, D.W. ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 59~64
DOI : 10.9718/JBER.2012.33.2.059
With rapid increasing usage of smart phones, social concerns have arisen about the possible effects of electromagnetic fields emitted from wideband code division multiple access(WCDMA) mobile phones on human health. The number of people with self-reported electromagnetic hypersensitivity(EHS) who complain of various subjective symptoms such as headache, insomnia etc. has also recently increased. However, it is unclear whether EHS results from physiological or other origins. In this double-blinded study, we investigated physiological changes such as heart rate, respiration rate, and heart rate variability with real and sham exposures for 15 EHS and 17 non-EHS persons using a module inside a dummy phone. Experiment was conducted using a WCDMA module with average power of 24 dBm at 1950 MHz with the specific absorption rate of 1.57 W/kg using a headphone for 32 min. As a conclusion, WCDMA RF exposure did not have any effects on the physiological variables in either group.
A Gaussian Mixture Model Based Surface Electromyogram Pattern Classification Algorithm for Estimation of Wrist Motions
Jeong, Eui-Chul ; Yu, Song-Hyun ; Lee, Sang-Min ; Song, Young-Rok ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 65~71
DOI : 10.9718/JBER.2012.33.2.065
In this paper, the Gaussian Mixture Model(GMM) which is very robust modeling for pattern classification is proposed to classify wrist motions using surface electromyograms(EMG). EMG is widely used to recognize wrist motions such as up, down, left, right, rest, and is obtained from two electrodes placed on the flexor carpi ulnaris and extensor carpi ulnaris of 15 subjects under no strain condition during wrist motions. Also, EMG-based feature is derived from extracted EMG signals in time domain for fast processing. The estimated features based in difference absolute mean value(DAMV) are used for motion classification through GMM. The performance of our approach is evaluated by recognition rates and it is found that the proposed GMM-based method yields better results than conventional schemes including k-Nearest Neighbor(k-NN), Quadratic Discriminant Analysis(QDA) and Linear Discriminant Analysis(LDA).
Keyhole Imaging Combined Phase Contrast MR Angiography Technique
Lee, D.H. ; Hong, C.P. ; Han, B.S. ; Lee, M.W. ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 72~77
DOI : 10.9718/JBER.2012.33.2.072
Phase Contrast MR Angiography(PC MRA) is excellent MRA technique for measuring the velocity of vessels in the human body. PC MRA need to at least four images for angiogram reconstruction and it caused longer scan time. Therefore, we used keyhole imaging combined PC MRA to reduce the scan time. However, keyhole imaging can lead the erroneous effects as loss of phase information or frequency discontinuous. In this study, we applied the keyhole imaging combined 2D PC MRA for improving the temporal resolution and also measured the velocity to evaluate the accuracy of phase information. We used 0.32T MRI scanner(Magfinder II, Scimedix, Korea). Using the 2D PC MRA pulse sequence, the vascular images for a human brain targeted on the Superior Sagittal Sinus(SSS) were obtained. We applied tukey window function for keyhole images to minimize the ringing artifact and erroneous factors that are induced frequency discontinuous and phase information loss. We also applied zero-padded algorithm to peripheral missing k-space lines to compare keyhole imaging results and the artifact power(AP) value was measured on the complex difference images to validate the image quality. Consider as based on our results, heavy image distortions and artifacts were shown until using at least 50% keyhole factor. Using above the 50% keyhole factors are shown well reconstructed and matched for magnitude images and velocity information measurements. In conclusion, we confirmed the image quality and velocity information of keyhole technique combined 2D PC MRA. Especially, measured velocity information through the keyhole imaging combination was similar to the velocity information of full sampled k-space image despite of frequency discontinuous and phase information loss in the keyhole imaging reconstruction process. Consequently, the keyhole imaging combined 2D PC MRA will give some clinical usefulness and advantages as improving the temporal resolution and measuring the velocity information via selecting the appropriate keyhole factor at low tesla MRI system.
Alteration of Trabecular Bone Microarchitecure at Tibial Epiphysis due to Knee Joint Instability by Anterior Cruciate Ligament Rupture: Difference between Medial and Lateral Part
Lee, Joo-Hyung ; Chun, Keyoung-Jin ; Kim, Han-Sung ; Lim, Do-Hyung ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 78~88
DOI : 10.9718/JBER.2012.33.2.078
Knee joint instability by anterior cruciate ligament(ACL) rupture is allowing the abnormal loading condition at the tibial epiphysis locally, resulting in producing locally different bone bruise. The study examined difference between local alteration patterns of trabecular bone microarchitecture at medial and lateral parts of the tibial epiphysis by ACL rupture. Fourteen SD rats were divided into Control(CON; n = 7) and Anterior Cruciate Ligament Transection(ACLT; n = 7) groups. The tibial joints were then scanned by in vivo
-CT at 0, 4, and 8 weeks post-surgery. The results showed that alteration pattern on trabecular bone microarchitecture at medial part was significantly higher than that at lateral part of the tibial epiphysis in ACLT group from 0 to 8 weeks(P < 0.05). Tb.Th and Tb.Sp distributions were well corresponded with differences between aforementioned trabecular bone microarchitectural alteration pattens at medial and lateral parts of the tibial epiphysis in ACLT group from 0 to 8 weeks(P < 0.05). These findings suggest that the alteration patterns of trabecular bone microarchitecture should be locally and periodically considered, particularly with respect to the prediction of bone fracture risk by ACL rupture. Improved understanding of the alteration patterns at medial and lateral trabecular bone microarchitectures at the tibial epiphysis may assist in developing more targeted treatment interventions for knee joint instability secondary to ACL rupture.
Study for Mechanical and Physicochemcial Properties of Silicone Gel Filled Mammary Implants
Baek, H. ; Jang, D.H. ; Song, J.M. ; Lee, S.Y. ; Seo, M.Y. ; Park, G.J. ; Maeng, E.H. ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 89~97
DOI : 10.9718/JBER.2012.33.2.089
The purpose of this study is to develop the guideline of the physicochemical and mechanical properties evaluation for silicone gel filled breast implants. First of all, the use and development status for silicone gel filled breast implants were investigated, and then, standard and criteria about performance evaluation established by the international organizations such as ASTM, FDA guidance and ISO were examined. To evaluate the mechanical properties, data research and testing for breaking strength, elongation, tensile set, joint intensity, silicone gel cohesion, weight loss from heating, static rupture resistance, impact resistance test, fatigue test, and gel bleed were performed. On the other hand, to evaluate the physicochemical properties, volatile matter, extent of cross linking, heavy metals, and extractable were analyzed. In this study, results for general function, mechanical properties and physicochemical properties were examined and reviewed for the accordance with international standard, and objective and standardized guideline was provided.
Analysis of Premotor Time and Electro-Mechanical Delay of Ankle Joint Muscles: A Comparison between Sitting and Standing Postures
Kim, Ji-Won ; Jeong, Hong-Young ; Kwon, Yu-Ri ; Kim, Hyo-Hee ; Eom, Gwang-Moon ; Park, Byung-Kyu ;
Journal of Biomedical Engineering Research, volume 33, issue 2, 2012, Pages 98~103
DOI : 10.9718/JBER.2012.33.2.098
The purpose of this study was to compare premotor time(PMT) and electro-mechanical delay(EMD) between sitting and standing posture. Twenty four healthy young subjects(12 women and 12 men) participated in this study. Subjects were instructed to perform maximal, voluntary, isometric contraction of ankle muscle(tibialis anterior and gastrocnemius muscles) in reaction to auditory stimulus. PMT and EMD, calculated from stimulus, EMG and torque profile were compared between sitting and standing postures. As statistical analysis, paired t-test was performed to assess difference between sitting and standing posture. In both tibialis anterior and gastrocnemius muscles, EMD was found to be significantly longer for standing than sitting. However, PMT in standing posture was longer than that in sitting posture only in gastrocnemius muscles. These result indicate that increased reaction time, particularly, increased EMD of ankle muscles in standing posture may be caused by co-contraction of ankle muscles for postural control in standing posture.