• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.19 no.1
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• pp.135-144
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• 2006

Objective : The purpose of this study was to know the clinical effects of hydrotherapy based Ultrasonic spa using SoPung-Tang on pulse wave velocity in patients with sequelae of CVA. Methods : PWV(Pulse wave velocity), Bio Chemistry, Hematology, Blood Pressure were investigated in 20 patients(Experimental group 13, Control group 7) who have been in Semyung Oriental medicine hospital from December 2005 to February 2006. Results : 1. In experimental group, Rt PWV diminished 4.8%, Lt PWV 5.1%. 2. In control group, Rt PWV diminished 3.3%, Lt PWV 1.8%. Conclusion : Hydrotherapy based Ultrasonic spa using SoPung-Tang showed useful effects in patients with sequelae of CVA.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.11a
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• pp.156-162
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• 2006

Pipe thinning is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for monitoring pipe thinning. Our basic idea come from that a group velocity of impact wave is different as wall thickness. If the group velocity is measured, wall thickness can be estimated. To obtain the group velocity, time-frequency analysis is used. This is because an arrival time difference can be measured easily in time-frequency domain rather than time domain. To test the performance of this technique, experiments have been performed for a plate and U type pipe. Results show that the proposed technique is quite powerful in the monitoring pipe thinning.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.16 no.12 s.117
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• pp.1224-1230
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• 2006

Pipe thinning is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for monitoring pipe thinning. Our basic idea come from that a group velocity of impact wave is different as wall thickness. If the group velocity is measured, wall thickness can be estimated. To obtain the group velocity, time -frequency analysis is used. This is because an arrival time difference can be measured easily in time-frequency domain rather than time domain. To test the performance of this technique, experiments have been performed for a plate and U type pipe. Results show that the proposed technique is quite powerful in the monitoring pipe thinning.

• The Journal of Korean Academy of Prosthodontics
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• v.25 no.1
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• pp.181-193
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• 1987

Author examined the chewing patterns between the 16 normal subjects and the 10 complete denture wearers with LED mandibular tracking device, and analized the chewing envelope and opening, closing velocity during chewing various test foods-standardized carrot, ham and almond. The results were as follows; 1. The chewing envelope of carrot chewing was greater than that of ham chewing in both groups. 2. The average opening velocity was faster than the average closing velocity in both groups. 3. During chewing carrot or almond, the chewing envelope of dentate stoup was greater than that of denture group, but during chewing ham, there was no statistical difference. 4. During chewing carrot or almond the average opening and closing velocity in dentate group were faster than those of denture group.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.4
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• pp.483-491
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• 2016

Precision of theoretical group velocity of waves in shell structures was discussed for the purpose of source localization of loose parts impact in pressure vessels of nuclear power plants. Estimating exact location of loose parts impact inside a reactor or a steam generator is very important in safety management of a NPP. Evaluation of correct propagation velocity of impact signals in pressure vessels, most of which are shell structures, is essential in impact source localization. Theoretical group velocities of impact signals in a plate and a shell were calculated by wave equations and compared to the velocities measured experimentally in a plate specimen and a scale model of a nuclear reactor. The wave equation applicable to source localization algorithm in shell structures was chosen by the study.

• Economic and Environmental Geology
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• v.52 no.6
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• pp.555-560
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• 2019

One-dimensional shear wave velocity structure of North Korea is constrained using short (2-sec) to long period (30-sec) Rayleigh waves generated from four seismic events in China. Rayleigh waves are well recorded at the five broadband seismic stations (BRD, SNU, CHNB, YKB, KSA) which are located near to the border between North and South Korea. Group velocities of fundamental-mode Rayleigh waves are estimated with the Multiple Filter Analysis and refined by using the Phase Matched Filter. Average group velocity dispersion curve ranging from 2.9 to 3.2 km/s, is inverted to constrain the shear wave velocity structures. Relatively low group velocity dispersion curves along the path between the events to BRD at period from 4 to 6 seconds may correspond to the sedimentary sequence of the West Korea Bay Basin (WKBB) in the Yellow Sea. The low velocity zone in deep layers (14-20 km) may be related to the deep sedimentary structure in Pyongnam basin. The fast shear wave velocity structure from the surface to the depth of 14 km is consistent with the existence of metamorphic rocks and igneous bodies in Nangrim massif and Pyongnam basin.

• Korean Chemical Engineering Research
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• v.50 no.3
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• pp.522-526
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• 2012

New experimental method to measure solid descending velocity in a vertical downcomer was presented and effects of downcomer diameter and particle properties on descending velocities for Geldart group A, B, and D particle have been measured and investigated. The effect of initial solid inventory on solid descending velocity was negligible. However, solid flow rate, solid circulation rate and solid descending velocity increased as the downcomer diameter increased. Moreover, solid descending velocity increased linearly as the downcomer diameter increased and showed distinguishable trend for Geldart group D particle from Geldart group A and B particles. Empirical correlations of solid descending velocity for Geldart group D and Geldart group A and B particles have been derived based on the measured values. The correlations could predict well the solid descending velocities.

• Journal of Korean Physical Therapy Science
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• v.17 no.1_2
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• pp.67-76
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• 2010

Background: The purpose of this study was to evaluate the influence of ankle strategy exercise on balance ability in the women of octogenarians. Methods: Ankle strategy exercise group(n=14), leg strengthening exercise group(n=14) were measured an balance ability by Berg Balance Scale(BBS) scores and Balance Performance Monitor(BPM) at pre-intervention and post-intervention in 6weeks. Results: This study were summarized as follows : 1. The BBS scores, sway area, sway path length, sway maximum velocity of ankle strategy exercise group and leg strengthening exercise group were significantly different among the intervention period(p<.05). 2. The improvement of BBS scores, sway area, sway path length, sway maximum velocity were significantly different between ankle strategy exercise group and leg strengthening exercise group at in 6weeks(p<.05). Conclusion: Learned from the ankle strategy exercise could improve BBS scores, sway area, sway path length, sway maximum velocity and a balance for the women of octogenarians. Ankle strategy exercise need to be applied clinically for balance ability of the women of octogenarians.

• Journal of the Korean Society of Physical Medicine
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• v.5 no.4
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• pp.569-576
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• 2010

Purpose : This study was aimed at determining the effects of community-based exercise program to improve leg muscle strength and balance for elderly women. Methods : This study was nonequivalent control group pre-post test design. Subjects were assigned to two different groups(exercise group=11, control group=7). Exercise group performed community-based exercise program for 8 weeks. Outcome measures included leg muscle strength, balance, walking velocity, activities of daily living(ADL), exercise self-efficacy and health-related quality of life(QoL). The collected data analyzed by independent t-test and paired t-test. Results : Leg muscle strength, walking velocity and mental component summary(QoL) were significantly improved in the exercise group. But balance and exercise self-efficacy were significantly worsened in the control group. There were no significant difference between groups after 8 weeks of community-based exercise. Conclusion : These results suggested that the community-based exercise program is effective for elderly women in improving leg muscle strength, walking velocity and mental component summary(QoL).

• Physical Therapy Rehabilitation Science
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• v.10 no.3
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• pp.270-277
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• 2021

Objective: The purpose of this study is to compare the effect of static balance, lower extremity function, and gait ability between a lower extremity restrain robot gait training and a general robot gait training in subacute stroke subjects. Design: Two-group pretest-posttest design. Methods: A total of 12 subacute stroke patients were randomly divided into an Experimental group (n=6) and a control group (n=6). Both groups were performed for four weeks, three times a week, for 20 minutes. To compare the Static balance function, the center of pressure (COP) path-length and COP velocity were measured. The Fugl-Meyer assessment lower extremity (FMA-LE) were evaluated to compare the Lower Extremity function. 2D Dartfish Program and 10 Meter Walking Test (10 MWT) on Gait ability were evaluated to compare the gait function. Results: In the intra-group comparison, Experimental groups showed significant improvement in COP path-length, velocity, Lower Extremity Function, 10 MWT, Cadence, by comparing the parameters before and after the intervention (p<0.05). Comparison of the amount of change between groups revealed significant improvement for parameters in the COP path-length, velocity, Lower extremity function, 10 MWT by comparing the parameters before and after the intervention (p<0.01). Conclusions: The Experimental group showed enhanced efficacy for variables such as COP path-length, velocity, Lower extremity function, 10 MWT as compared to the control group.