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Search Results: 1 - 10 of 20464 matches for " Junghwan Kim "
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A Pilot Study on the Effect of Pelvic Exercise on Standing Balance in Patients with Incomplete Cervical Spinal  [PDF]
Bo-Ra Choi, Ju-Hyun Kim, Junghwan Kim
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.43023

The purpose of this study was to evaluate the effect of pelvic exercise on standing balance in patients with incomplete cervical spinal cord injury for healthy rehabilitation. 11 patients (8 men and 3 women) with levels of incomplete injury between cervical 3 and cervical 6 who were participated in a study measuring the standing balance using an interactive balance system (IBS) before and after pelvic exercise. The index of standing balance after pelvic exercise was significantly lower than before exercise in patients with incomplete cervical cord injury. The greatest improvements were observed in incomplete cervical spinal cord injury with neurologic levels of cervical 3 and 4 with Brown-Sequard syndrome. These results suggest that the pelvic exercise for rehabilitation significantly improved in part standing balance in patients with incomplete cervical spinal cord injury.

Analysis of occupational noise for the healthy life according to the job characteristics  [PDF]
Lim-Kyu Lee, Ju-Hyun Kim, Bokyung Kim, Junghwan Kim
Health (Health) , 2012, DOI: 10.4236/health.2012.410137
Abstract: Noise is known that the physical risk factors defined as any unwanted sound. It can induce the health problems such as hearing loss or annoyance. The objective of this study was to assess the occupational noise exposure of nine groups for twenty peoples according to job characteristics and to compare the noise level by different variables. Personal noise levels were measured for three times using by dosimeters for each participant in Korea. The mean time weighted average noise level (TWA) of total was 73.2 ± 11.5 dBA by American conference of governmental industrial hygienists (ACGIH) standard. Especially, Korean classical music students were highly exposed to 93.2 ± 6.2 dBA but, office workers were 63.2 ± 6.6 dBA. In case of peak sound pressure level (Lpeak), Korean classical music students and firefighters were exposed to the highest level of 151.8 dBC and 145.8 dBC during playing and dispatching, respectively. The analysis of noise level showed that Leq had positive correlations between TWA by ministry of employment and labour (MOEL) (r = 0.98, p < 0.01) and TWA by ACGIH (r = 0.98, p < 0.01). Unlikely other groups, the noise exposure level of the Korean classical music students were exceeded the ACGIH standard. These results suggest that Korean classical music students were exposed high noise level and some solutions are need to reduce the noise exposure level such as using hearing protect device.
Analysis of the sensory threshold between paretic and nonparetic sides for healthy rehabilitation in hemiplegic patients after stroke  [PDF]
Hye-Joo Jeon, Ju-Hyun Kim, Byong-Yong Hwang, Bokyung Kim, Junghwan Kim
Health (Health) , 2012, DOI: 10.4236/health.2012.412183
Abstract: The purpose of this study was to investigate the differences in the sensory threshold between the paretic and nonparetic sides of hemiplegic patients. 28 patients who were hemiplegic post-stroke (14 men and 14 women) participated in the electrical sensory and pain thresholds study; 22 patients who were hemiplegic post-stroke (13 men, 9 women) participated in a study measureing the sensory threshold with light touch. Electrical sensory and pain thresholds were measured in the forearm via transcutaneous electrical nerve stimulation. The light-touch threshold was measured in the forearm using monofilaments. The light-touch, electrical sensory, and pain thresholds for the paretic side were significantly higher than for the nonparetic side in our population, respectively. In both the nonparetic and paretic sides, the male group generally showed higher thresholds for pain and sensation than did the female group. These results suggest that the different evaluations of sensory thresholds performed in this study for healthy rehabilitation will be a valuable clinical tool in hemiplegic patients after stroke.
The Effects of Hippotherapy on Standing Balance in Patients with Incomplete Cervical Spinal Cord Injuries: A Pilot Study  [PDF]
Bo-Ra Choi, Ju-Hyun Kim, Jeong-Uk Lee, Junghwan Kim
Neuroscience & Medicine (NM) , 2013, DOI: 10.4236/nm.2013.41002
Abstract: The present study was designed to evaluate the effects of hippotherapy on standing balance in patients with incomplete cervical spinal cord injuries. Ten patients (8 men and 2 women) who were diagnosed with cervical levels of injury between 3 and 6, and D according to the ASIA Impairment Scale. All patients were tested by the physiotherapists prior to and after hippotherapy treatment. Standing balance was measured using the Interactive Balance System (IBS). The weight distribution index was significantly increased in application of hippotherapy compared with control groups in patients with a neurologic level of cervical 3 and 4, and with Brown-Sequard syndrome, respectively. However, most of the patients exhibited no significant changes in the standing balance index, such as F1, F2-4, F5-6, F7-8, and SI scores, after hippotherapy. These results suggest that hippotherapy did not have a significant effect on the standing balance of patients with incomplete cervical spinal cord injuries.
The Effect of Low Frequency Repetitive Transcranial Magnetic Stimulation Combined with Range of Motion Exercise on Paretic Hand Function in Female Patients after Stroke  [PDF]
Mee-Young Kim, Ju-Hyun Kim, Jeong-Uk Lee, Byong-Yong Hwang, Junghwan Kim
Neuroscience & Medicine (NM) , 2013, DOI: 10.4236/nm.2013.42012

Repetitive transcranial magnetic stimulation (rTMS) has recently been demonstrated to improve motor function after stroke. However, no study has yet tested the synergetic effects of physical exercise on rTMS in clinical settings. We investigated the effect of a 6-session course of low frequency rTMS on contralesional primary motor cortex combined with range-of motion (ROM) exercise on paretic hand function in female stroke patients. This was a single-blind study of the effects of rTMS with or without ROM exercise in female hemiplegic patients after stroke. All patients underwent rTMS on the contralesional primary motor cortex for 15 minutes and ROM exercise on the paretic hand. The cortical excitability determined by the amplitude and latency of the motor evoked potential (MEP) was measured in both first dorsal interosseous (FDI) muscles. We also evaluated arm function using Box and Block, arm reach, 9-hole pegboard, power grip, and pinch grip force tests. The rTMS-induced MEP amplitude of the paretic side significantly increased whereas the non-paretic side showed a decrease through every session. However, the MEP latency significantly increased on the non-paretic hand at post-rTMS with exercise, but a tendency of decrement on paretic hand at same application. Motor function showed improvement in the 9-hole pegboard and arm reach tests at post-rTMS with exercise on the paretic side compared with the non-paretic side. A significant correlation was especially noted between motor function and MEP on the paretic side of stroke patients. Low frequency rTMS with ROM exercise improved hand function after stroke. This may, in part, result in additional rehabilitation in stroke patients.

Differences in body components and electrical characteristics between youth soccer players and non-athletes  [PDF]
Seung-Min Yang, Won-Deok Lee, Ju-Hyun Kim, Mee-Young Kim, Junghwan Kim
Health (Health) , 2013, DOI: 10.4236/health.2013.56134

Many previous studies have focused on youth soccer player injuries without body component analysis compared to non-athletes. Only a few studies which have investigated body components of youth soccer players, and studies that look at electrical characteristics used by rheobase and chronaxie as well as body components are even scarcer. Therefore, we feel that there is a need for a study investigating objective clinical analysis of the body components (body structure and body composition) and electrical characteristics of both youth soccer players and non-athletes. Sixty subjects participated in our study, comprising of thirty youth soccer players and thirty non-athletes. The Inbody 520 was used to measure and analyze body composition and the Duo 500 was employed to measure electrical characteristics. It was observed that the soccer players showed markedly lower total impedance compared to the non-athletes. In both legs, it was particularly noted that there were significant differences between the right and left sides. The soccer players showed a higher skeletal muscle mass and lean/ideal lean × 100% compared to the non-athletes. Furthermore, the soccer players had a lower rheobase and higher chronaxie. A comparison of the genders showed a similar pattern. In this study, we were able to separate the differences in body components and electrical characteristics between the subject groups using a systemic approach. Future studies on diverse types of athletes would contribute further to the development of clinical physiotherapy and sports rehabilitation.

Endoscopic and clinicopathologic characteristics of early gastric cancer with high microsatellite instability
Jaehoon Jahng,Young Hoon Youn,Kwang Hyun Kim,Junghwan Yu
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i27.3571
Abstract: AIM: To investigate endoscopic and clinicopathologic characteristics of early gastric cancer (EGC) according to microsatellite instability phenotype. METHODS: Data were retrospectively collected from a single tertiary referral center. Of 981 EGC patients surgically treated between December 2003 and October 2007, 73 consecutive EGC patients with two or more microsatellite instability (MSI) mutation [high MSI (MSI-H)] and 146 consecutive EGC patients with one or no MSI mutation (non-MSI-H) were selected. The endoscopic and clinicopathologic features were compared between the MSI-H and non-MSI-H EGC groups. RESULTS: In terms of endoscopic characteristics, MSI-H EGCs more frequently presented with elevated pattern (OR 4.38, 95% CI: 2.40-8.01, P < 0.001), moderate-to-severe atrophy in the surrounding mucosa (OR 1.91, 95% CI: 1.05-3.47, P = 0.033), antral location (OR 3.99, 95% CI: 2.12-7.52, P < 0.001) and synchronous lesions, compared to non-MSI-H EGCs (OR 2.65, 95% CI: 1.16-6.07, P = 0.021). Other significant clinicopathologic characteristics of MSI-H EGC included predominance of female sex (OR 2.77, 95% CI: 1.53-4.99, P < 0.001), older age (> 70 years) (OR 3.30, 95% CI: 1.57-6.92, P = 0.002), better histologic differentiation (OR 2.35, 95% CI: 1.27-4.34, P = 0.007), intestinal type by Lauren classification (OR 2.34, 95% CI: 1.15-4.76, P = 0.019), absence of a signet ring cell component (OR 2.44, 95% CI: 1.02-5.86, P = 0.046), presence of mucinous component (OR 5.06, 95% CI: 1.27-20.17, P = 0.022), moderate-to-severe lymphoid stromal reaction (OR 3.95, 95% CI: 1.59-9.80, P = 0.003), and co-existing underlying adenoma (OR 2.66, 95% CI: 1.43-4.95, P = 0.002). CONCLUSION: MSI-H EGC is associated with unique endoscopic and clinicopathologic characteristics including frequent presentation in protruded type, co-existing underlying adenoma, and synchronous lesions.
A Fluorescence-Based Assay for Measuring the Redox Potential of 5-Lipoxygenase Inhibitors
Sangchul Lee, Youngsam Park, Junghwan Kim, Sung-Jun Han
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087708
Abstract: The activities and side effects of 5-lipoxygenase (5-LO) inhibitors can be predicted by identifying their redox mechanisms. In this study, we developed a fluorescence-based method to measure the redox potential of 5-LO inhibitors and compared it to the conventional, absorbance-based method. After the pseudo-peroxidase reaction, the amount of remaining lipid peroxide was quantified using the H2DCFDA (2′,7′-dichlorodihydrofluorescein diacetate) fluorescence dye. Our method showed large signal windows and provided comparable redox potential values. Importantly, the redox mechanisms of known inhibitors were accurately measured with the fluorescence assay, whereas the conventional, absorbance-based method showed contradictory results. Our findings suggest that our developed method is a better alternative for classifying the redox potential of 5-LO inhibitors, and the fluorescence assay can be effectively used to study the mechanisms of action that are related to redox cycling.
A construction of slice knots via annulus modifications
JungHwan Park
Mathematics , 2015,
Abstract: We define an operation on homology ${B}^4$ which we call an $n$-twist annulus modification. We give a new construction of smoothly slice knots and exotically slice knots via $n$-twist annulus modifications. As an application, we present a new example of a smoothly slice knot with non-slice derivatives. Such examples were first discovered by Cochran and Davis. Also, we relate $n$-twist annulus modifications to $n$-fold annulus twists which was first introduced by Osoinach, then has been used by Abe and Tange to construct smoothly slice knots. Furthermore we consider $n$-twist annulus modifications in more general setting to show that any exotically slice knot can be obtained by the image of the unknot in the boundary of a smooth $4$-manifold homeomorphic to ${B}^4$ after an annulus modification.
Optimal Detection Range of RFID Tag for RFID-based Positioning System Using the k-NN Algorithm
Soohee Han,Junghwan Kim,Choung-Hwan Park,Hee-Cheon Yoon,Joon Heo
Sensors , 2009, DOI: 10.3390/s90604543
Abstract: Positioning technology to track a moving object is an important and essential component of ubiquitous computing environments and applications. An RFID-based positioning system using the k-nearest neighbor (k-NN) algorithm can determine the position of a moving reader from observed reference data. In this study, the optimal detection range of an RFID-based positioning system was determined on the principle that tag spacing can be derived from the detection range. It was assumed that reference tags without signal strength information are regularly distributed in 1-, 2- and 3-dimensional spaces. The optimal detection range was determined, through analytical and numerical approaches, to be 125% of the tag-spacing distance in 1-dimensional space. Through numerical approaches, the range was 134% in 2-dimensional space, 143% in 3-dimensional space.
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