• Journal of Korean Physical Therapy Science
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• v.26 no.3
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• pp.57-69
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• 2019

Background: The purpose of this study was to compare and analyze the effects of neck and trunk combined exercise program and single exercise on neck angle and neck and shoulder muscle activity. Design: Randomized controlled trial. Methods: In the single exercise group, the basic stretching, head bending and neck bending exercises were performed. The neck and trunk combined exercise group performed torso strength and trunk stability exercises to stabilize the trunk, and then performed the same neck exercise as the single exercise group. The exercise program was conducted 5 days per week for 2 weeks. One-way repeated ANOVA was used to investigate the statistical analysis of neck angle, neck and upper and middle trapezius muscle activity. Results: 1) There was no significant difference in neck angle degree after exercise in neck single exercise group. 2) In the neck and trunk combined exercise, the neck angle degree decreased continuously with the increase of the experimental period and showed a significant difference. 3) In the single exercise group, the muscles which showed significant difference compared to the post-exercise were the right upper, left and right middle trapezius. 4) In the neck and trunk combined exercise group, the right neck muscles showed significant difference after the exercise before the experiment. Conclusion: It was found that the neck and trunk combined exercise was more effective in reducing neck angle and the muscle activity of the subjects with forward head posture was decreased and increased. However, both exercises showed positive effects.

• Journal of the Korean Society of Physical Medicine
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• v.18 no.1
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• pp.25-35
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• 2023

PURPOSE: This study examined the effects of applying mat Pilates and kinesio taping on the craniovertebral angle and muscle activity of adults in their 20s with a forward head posture. METHODS: The subjects were 20 adults in their 20s with a forward head posture: 10 from the Mat Pilates group (MPG) and 10 from the Kinesio taping group (KTG). Each group received the intervention for four weeks. The craniovertebral angle and muscle activity were measured before and after the intervention. Statistical analysis of this study was performed using SPSS Ver. 23.0 for Windows was used, and the statistical significance level was set to α = .05. RESULTS: The change in the craniovertebral angle within each group was decreased significantly after the intervention for both MPG and KTG (p < .05), but there was no significant difference in the comparison result of the difference in the amount of change between each group (p > .05). The change in muscle activity within each group did not show any significant change before and after the intervention in all the MPG and KTG muscles (p > .05), and there was no significant difference in all variables for the difference in the amount of change between each group (p > .05). CONCLUSION: Mat Pilates effectively reduced the CVA, but neither intervention significantly affected muscle activity.

• Korean Journal of Hydrosciences
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• v.7
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• pp.77-86
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• 1996

An air chamber is design to keep the pressure from exceeding a predetermined value, or to prevent low pressures and colum separation. Therefore, it can be used to protect against rapid transients in a pipe system following abrupt pump stoppage. In this research, an air chmber was applied to a hypthetical pipe system to analyze attenuation effect of pressure head for different air volumes, locations, chamber areas, coefficients of orifice loss and pollytropic exponents. With an increase of air volume, the maximum pressure head at pump site is decreased and the minimum pressure head is imcreased. For different locations and areas of the chamber, the attenuation effects do not show much difference. Also, as the orifice loss coefficient increases, the maximum pressure head is decreased. For different polytropic exponents, isothermal process shows lower maximum pressure head than that of the adiabatic process.

• Journal of Surface Science and Engineering
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• v.46 no.3
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• pp.133-138
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• 2013

We have developed a 2D axi-symmetric numerical model for an inductively coupled plasma system in order to analyze gas mixing effect through a narrow gap shower head. For frictional flow, holes of 0.5 mm diameter and 2 mm length are approximately modeled in 2D. Gas velocity distribution 10 mm below the shower head showed 2 times difference between the center and the edge at 10 mTorr. At 10 mm above the wafer, it was increased to 6 times difference due to the pumping duct effect. The model with a 5 mm height buffer region of a shower head showed reasonable behavior of Ar discharge. The density of Ar metastable showed additional peak inside the buffer region around the edge holes.

• Transactions of the Korean Society of Mechanical Engineers
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• v.15 no.2
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• pp.523-536
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• 1991

This dissertation analyzes the running mechanism of flexible and thin tape above rotating head through the numerical simulation and the experiment. The scope of analysis is confined to the phenomena of two dimensional elasto hydrodynamic lubrication between the protruded bump on a rotating cylinder and the running tape. This model is based on the elastic deformation equation of plate and shell and Reynolds equation. Finite difference method is employed as a numerical technique to calculate (1) the distribution of pressure between the running tape and rotating bump and (2) the vertical deformation of elastic thin tape over he rotating bump under hydrodynamic pressure. In numerical analyses, the effects of bump size on flying characteristics of the tape were evaluated and examined considering the influence of tension and stiffness of tape.

• Journal of Korean Physical Therapy Science
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• v.24 no.2
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• pp.36-44
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• 2017

Background: To determine the effect of proprioceptive exercise(PE) on muscle activation and balance of healthy subjects. Methods: 20 subjects were randomly assigned to proprioceptive exercise(PE, n=10) and general exercise group(GE, n=10). To measure muscle activation of the lower limb and balance. For evaluation of muscle activation(Tibialis anterior, Gastrocnemius lateral and medial head), the Electromyogram was used, and balance was measured using the one-leg standing test, OLST. Results: Tibialis anterior(TA), Gastrocnemius medial head(GM) and Gastrocnemius lateral head(GL) muscle activations were significantly (p<0.05) improved in PE group and GE group. and significantly difference between groups(p<0.05). Regarding balance, eye open and close OLST were significantly (p<0.05) increased in PE group and GE group. and significantly difference between groups(p<0.05). Conclusion: Proprioceptive exercise can improve muscle activation of the lowe limb and balance in subjects.

• Journal of Audiology & Otology
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• v.25 no.4
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• pp.230-234
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• 2021

Otosclerosis, a hereditary disorder characterized by disordered resorption and deposition of bone, results in progressive hearing loss. Osteogenesis imperfecta (OI) is a genetic disorder characterized by recurrent fractures, blue sclera, and varying degrees of hearing impairment; and is a known risk factor for otosclerosis. After adolescence, the risk of fracture decreases, reducing the need for follow-up in OI. However, otosclerosis is a progressive disorder. In this report, we discuss two cases of familial otosclerosis with different clinical features. We hypothesize that the difference in hearing level correlates with the difference in computed tomography findings. The mother, whose case was considered severe, was prescribed hearing aids, while the daughter, who had normal hearing level, was regularly followed up.

• Korean Journal of Audiology
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• v.25 no.4
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• pp.230-234
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• 2021

Otosclerosis, a hereditary disorder characterized by disordered resorption and deposition of bone, results in progressive hearing loss. Osteogenesis imperfecta (OI) is a genetic disorder characterized by recurrent fractures, blue sclera, and varying degrees of hearing impairment; and is a known risk factor for otosclerosis. After adolescence, the risk of fracture decreases, reducing the need for follow-up in OI. However, otosclerosis is a progressive disorder. In this report, we discuss two cases of familial otosclerosis with different clinical features. We hypothesize that the difference in hearing level correlates with the difference in computed tomography findings. The mother, whose case was considered severe, was prescribed hearing aids, while the daughter, who had normal hearing level, was regularly followed up.

• The Journal of Korean Medicine
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• v.34 no.1
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• pp.80-88
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• 2013

Objectives: The purpose of this study was to examine the effect of Temporomandibular joint Balance Appliance for Golf (TBA-G) of Functional Cerebrospinal Therapy (FCST) on golf driver head speed and back muscle power. Methods: Twenty-one participants that had a golf career of 4 years or more were involved. We measured golf drive head speed and back muscular strength before and after applying TBA-G in the mouth. A paired t test or Wilcoxon singed rank test was performed to identify the difference of effect between before and after applying TBA-G, using IBM SPSS 19.0. We considered difference significant at P<0.05. Results: Driver head speed increased significantly by 2 mph (1.99%) after applying TBA-G [from $100.52{\pm}9.82$ mph ($mean{\pm}SD$) to $102.52{\pm}10.43$ mph, P<0.001]. Back muscular strength also increased by 7.28 kg (5.60%) [from $129.90{\pm}28.31$ kg to $137.18{\pm}28.81$ kg, P<0.001]. In stratification analysis, a more significant increase was found in the drive head speed and back muscular strength of groups of males with weight more than 69kg, with height more than 175cm, and with golf experience more than 7 years, compared to those of other groups. Conclusions: The results suggest that TBA-G could improve golf drive head speed and back muscular strength.

• Journal of Korean Clinical Health Science
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• v.5 no.4
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• pp.991-997
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• 2017

Purpose. The purpose of this study was to muscle properties analysis of SCM(sternocleidomastoid) Muscle according to posture type when using smartphone. Methods. This study was conducted on 73 college students who are using smartphone. Subjects were analyzed myotonPRO to confirm, prone posture group, stand posture group, drop head above $45^{\circ}$in sit posture on a chair group and drop head below $45^{\circ}$in sit posture on a chair group were measured SCM muscle. The myotonPRO were measured one measurer, total 3 times. Comparative analysis of the each groups were investigated of SCM muscle properties. Results. We found that Frequency, Stiffness, Creep and Relaxation were appeared difference in each posture. F index was increased at drop head below $45^{\circ}$group than stand posture group. S index was increased at drop head above $45^{\circ}$group than prone posture group. C index was decreased at drop head below $45^{\circ}$group and drop head above $45^{\circ}$group than prone posture group. R index was decreased at drop head above $45^{\circ}$group than prone posture group. Conclusions. The muscle properties were appeared difference in each posture of SCM muscle using smartphone.