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Does Adequate Lumbar Segmental Motion Reflect Recovery Process in Acute Lumbar Disc Herniation?
Hyuntae Kim,Ho Joong Jung,Minsun Kim,Seong-Eun Koh,In-Sik Lee 대한재활의학회 2019 Annals of Rehabilitation Medicine Vol.43 No.1
Objective To investigate if the extent of lumbar segmental motion is correlated with the recovery process in the form of pain intensity in patients with acute single level lumbar disc herniation (LDH). Methods A retrospective review of medical records was performed on patients presented with acute low back pain from January 2011 to December 2017. With prerequisites of undergoing both lumbar spine magnetic resonance imaging and functional radiography, patients with etiologies other than single level LDH were excluded. A total of 46 patients were selected, including 27 patients with disc herniation at L4-5 level and 19 patients at L5-S1 level. Pearson correlation analysis of pain intensity against segmental range of motion (sROM) and percentage of sROM of each lumbar segment was performed at the initial evaluation point and follow-ups. Results Serial documentation of pain intensity and functional radiography exhibited an inverse correlation between changes in visual analogue scale (VAS) and sROM in single level LDH at L4-5 level (r=-0.69, p<0.05). In addition, percentage of sROM showed a negative correlation with pain intensity at the aforementioned segment (r=-0.74, p<0.05). Initial pain intensity was also inversely correlated to sROM of the affected segment (r=-0.83, p<0.01 at L4-5; r=-0.82, p<0.05 at L5-S1). Conclusion Improvement in sagittal mobility of the affected segment in LDH adequately reflected mitigation of low back pain during the recovery process. This conjunction could illustrate that the involved segment is overcoming natural immobilization, evidently demonstrating an inverse relationship between initial pain intensity and limitation of sagittal range of motion.
Growth of Sheet-like ZnO Nanostructures on ZnO nano rods using Chemical Bath Deposition
Hyuntae Kim,Soobong Choi 한국진공학회(ASCT) 2018 Applied Science and Convergence Technology Vol.27 No.2
We demonstrate the growth of a sheet-like ZnO membrane on ZnO nano rod layers. The growth process is composed of 3 steps of ZnO seed formation, ZnO nano rod growth and sheet-like ZnO membrane formation on those nano rods. To confirm the fundamental growth mechanism, the lattice structures of each step were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM) measurement. Analysis of the relation between the texture coefficient and the surface shape of the ZnO membrane on the ZnO nano rods shows that the surface morphology of ZnO nano structures can be controlled using the temperature of the growing solution and the concentration of the chemical solution.
Practical localization system for consumer devices using zigbee networks
Hyuntae Cho,Hyunsung Jang,Yunju Baek IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.3
<P>As the era of ubiquitous computing dawns, there is a growing need for a reliable, efficient positioning and tracking system. A localization system involves ongoing tracking of the location of assets and personnel. This paper presents a practical localization system for consumer devices on Zigbee networks. The proposed system is based on time-difference-of-arrival (TDOA). Localization based on TDOA involves estimating the location of the device by calculating the time-difference-of-arrival of the signal received from a device. In order to calculate the time difference of the signal, TDOA-based methods require precision time measurements of the signal, and reader time synchronization accurate to within a few nanoseconds. We also propose a precise time stamping unit, which enables the system to determine the arrival time of the radio signal, and a precision time synchronization protocol, which enables readers to have a reference clock. In addition, this paper includes an experimental performance evaluation of the localization system. The performance shows that the localization system has a DRMS of approximately two meters in a harsh environment.</P>
Effects of hip flexion by sitting posture on trunk muscle activity and balance in healthy adults
Hyuntae Kim,Myunggi Cho,정이정 물리치료재활과학회 2023 Physical therapy rehabilitation science Vol.12 No.4
Objective: This study compared trunk muscle activity and balance by applying hip joint flexion according to sitting posture tohealthy adultsDesign: Cross-sectional studyMethods: Twenty-four healthy adults (18 men and 6women) were instructed to perform the hip flexion while assuming two typesof posture (erect sitting and slump sitting). EMG (Electromyography) data (% maximum voluntary isometric contraction) were recorded three times from the rectus abdominis, interanl oblique abdominis, external oblique abdominis and erector spine ofparticipant’s both side and the mean values were analyzed. Results: During hip flexion in erect sitting, rectus abdominis, internal oblique abdominis and external oblique muscles showed a statistically significant difference compared to hip flexion in a slump sitting position (p<0.05). In addition, the left and rightdeviation of hip flexion in the erect sitting position was found to be smaller than that of hip flexion in the slump sitting position. Conclusions: In this study, we compared the trunk muscle activity and balance of hip flexion in a standing sitting position and a bent sitting position. However, since only a temporary effect was verified with the cross-sectional study design, it is thought that an experimental study that can verify the long-term effect is needed in the future. Therefore, it is thought that it would be better toanalyze by adding more variables than this study.