• Journal of International Academy of Physical Therapy Research
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• v.8 no.2
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• pp.1146-1151
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• 2017

The purpose of this study was to compare the effects of respiratory exercise on cardiopulmonary function and muscle activity of rectus abdominis in smokers and non-smokers with elderly people. All the participants were older than 65 years, and twenty non-smokers, and twenty smokers participated. Non-smokers and smokers were randomly divined into 10 feedback breathing exercises (FBE) and a balloon-blowing exercise (BBE) group. The FBE and the BBE were performed three times a week for four weeks. Forced vital capacity (FVC), forced expiratory volume at one second (FEV1), forced expiratory volume at one second/forced vital capacity (FEV1/FVC), peak expiratory flow (PEF), and vital capacity (VC) were measured as pulmonary function. EMG was used to measure the activity of the rectus abdominis. In the FBE and BBE groups, $FEV_1$ was significantly lower in non-smokers compared to smokers at two and four weeks (p<.05), $FEV_1/FVC$, PEF and VC were significantly lower in non-smokers compared to smokers to pre-test, two weeks, four weeks and six weeks (p<.05). Muscle activity of rectus abdominis was significantly difference in the BBE group at pre-test, two weeks, four weeks, and six weeks (p<.05). These results suggest that respiratory exercise was effective in improving pulmonary function and rectus muscle activity.

• Journal of Biosystems Engineering
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• v.35 no.6
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• pp.393-400
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• 2010

Uniform and rapid pre-drying of mandarin is important to improve the storage quality. The aim of this study was to suggest the basic design of forced ventilated pre-drying facility for mandarin by thermal flow analysis using computational fluid dynamics software (FLUENT 6.2). Developed CFD simulation model was verified by comparison with experimental data. Airflows and temperature distributions in the five conceptional designs including existing ordinary temperature storage rooms were analyzed and appropriate basic design was determined. Analysis of the effect of arrangement of windows and exhaust fans on thermal flow in facility was carried out for more detailed design. The results of this investigation showed that the predicted airflow velocity by CFD simulation showed a good agreement with the measured value and optimum design condition for simulated forced ventilated pre-drying facility of mandarin has two exhaust fans and two windows on both sidewalls and cover on loaded mandarin.

• Journal of International Academy of Physical Therapy Research
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• v.9 no.4
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• pp.1596-1601
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• 2018

Smoking can be a significant cause of lung diseases and reduced respiratory functions. Among soldiers, smoking may have a negative impact on their health (physical strength) and well being. Information on differences in the respiratory functions of smokers and nonsmokers in the military services and the effects of the smoking duration and amount (i.e., the number of cigarettes smoked per day) would be useful. This study investigated smoking durations and smoking amounts among young male soldiers (N = 61). The forced vital capacity (FVC), forced expiratory volume in 1 sec (FEV1), and forced expiratory volume in 1 sec/forced vital capacities (FEV1/FEC) were measured FVC, FEV1, or FEV1/FEC of smokers and nonsmokers were not significantly different, and FVC and FEV1 were inversely proportional to smoking duration. Besides, the number of cigarettes smoked per day was not correlated with respiratory functions. These findings may be attributed to the effect of the strenuous physical activity (e.g., military drills) undertaken by soldiers on their respiratory functions. Despite the lack of evidence for a difference in the respiratory functions of smokers and nonsmokers, this study recommends ongoing respiratory function management through smoking cessation programs and respiratory physiotherapy to manage the respiratory functions of Korean smoking soldiers.

• The Journal of Korean Physical Therapy
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• v.31 no.5
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• pp.261-265
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• 2019

Purpose: This study examined the effects of Vojta therapy on the respiratory function in young male smokers. Methods: Three subjects were tested using the ABA design for Single-subject Experimental Research Design. This study was conducted with the baseline, intervention, and follow-up phase. Intervention was conducted three to four times a week for 20 minutes per times and a total of 25 sessions. The respiratory function was measured using a Spirometer. Results: The results of Forced Vital Capacity and Forced Expiratory Volume at one second for all subjects showed improvements in the intervention phase over the baseline phase. In the follow-up phase, the improved ability was still maintained or slightly reduced. Conclusion: Vojta therapy used on young male smokers was effective in both FVC and FEV1. In other words, the Vojta therapy worked effectively in improving the respiratory function. In future studies, it is necessary to have a control group and increase the number of trials in order to generalize the effect of Vojta therapy.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.03a
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• pp.810-812
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• 2008

Previously study on structural design of the main wing of the twenty-seat class WIG(Wing in Ground Effect) craft. In the final design, three spars construction was selected for safety in the critical flight load, and the Carbon-Epoxy material was selected for lightness and structural stability. In this study, the forced vibration analysis was performed on the composite main wing structure of the twenty-seat class WIG craft with two-stroke pusher type reciprocating engine. The vibration analysis based on the finite element method was performed using a commercial FEM code, MSC/NASTRAN. Excitations for the frequency response analysis were assumed as the H-mode(horizontal mode), the V-mode(vertical mode) and the X-mode(twisted mode) which are typical main vibration modes of engine. And excitations for the transient response analysis were assumed as the L-mode(longitudinal mode) with the oscillating propeller thrust which occurs in operation. According to the result of forced vibration analysis, structural design was modified to reduce the vibrations.

• Structural Engineering and Mechanics
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• v.71 no.5
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• pp.553-562
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• 2019

This paper presents the results of a study into the dynamic behaviour of a support structure of a mobile elevating work platform. The vibrations of the mechanical system of the observed structure are examined analytically, numerically, and experimentally. Within the analytical examination, a simple mathematical model is developed to describe free and forced vibrations. The dynamic analysis of the mechanical system is conducted using a discrete dynamic model with a reduced number of vibrational degrees of freedom. On the basis of the expression for the system energy, and by applying Lagrange's equations of the second kind, differential equations are derived for system vibrations, frequencies are determined, and the laws of forced platform vibration are established. At the same time, a nonlinear FEM model is developed and the laws of free and forced vibration are determined. The experimental and numerical part of the study deal with the examination of the real structure in extreme conditions, taking into account: the lowest eigenfrequency, forced actions that could endanger the general stability, the maximal amplitudes, and the acceleration of the work platform. The obtained analytical and numerical results are compared with the experiments. The experimental verification points to the adverse behaviour of the platform in excitation cases - swaying. In such a situation, even a relatively small physical force can lead to unacceptably high amplitudes of displacement and acceleration - exceeding the usual work values.

• Steel and Composite Structures
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• v.31 no.5
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• pp.489-502
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• 2019

This article presents a unified mathematical model to investigate free and forced vibration responses of perforated thin and thick beams. Analytical models of the equivalent geometrical and material characteristics for regularly squared perforated beam are developed. Because of the shear deformation regime increasing in perforated structures, the investigation of dynamical behaviors of these structures becomes more complicated and effects of rotary inertia and shear deformation should be considered. So, both Euler-Bernoulli and Timoshenko beam theories are proposed for thin and short (thick) beams, respectively. Mathematical closed forms for the eigenvalues and the corresponding eigenvectors as well as the forced vibration time response are derived. The validity of the developed analytical procedure is verified by comparing the obtained results with both analytical and numerical analyses and good agreement is detected. Numerical studies are presented to illustrate effects of beam slenderness ratio, filling ratio, as well as the number of holes on the dynamic behavior of perforated beams. The obtained results and concluding remarks are helpful in mechanical design and industrial applications of large devices and small systems (MEMS) based on perforated structure.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.11
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• pp.49-57
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• 2020

The forced vibration characteristics for two impulse forces with time lag was discussed in the vehicle dull progress model. Detailed numerical analyses of the time domain were performed systematically. By the two exciting impulse forces, the responses of displacement, the velocity, and the acceleration were investigated in detail for the vehicle's vibration. Notably, the forced vibration responses in the time domain can be used to identify and monitor several vehicle vibration models. In order to define the responses of displacement, the velocity, and the acceleration, we applied a numerical technique (i.e., the Runge-Kutta-Gill method[1,2]). These variables were subsequently used to analyze the vehicle's vibration according to the time lapse and while it passed over a bump stock; moreover, the characteristics of the variables were analyzed in detail according to their force conditions. Finally, the intrinsic characteristics of the forced vibration were discussed in the context of the automobile model. Overall, our results indicate that the tested method can be successfully applied under different damped conditions.

• Archives of Orthopedic and Sports Physical Therapy
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• v.14 no.2
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• pp.17-24
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• 2018

Purpose: This study aimed to investigate the relationship between forward head posture and pulmonary function in young women. Methods: Thirty-three young women participated in this study. The participants were grouped into non-forward head posture, mild forward head posture, and moderate-severe forward head posture groups. The craniovertebral angle (CVA) and pulmonary function were measured using ImageJ and a spirometer, respectively. Results: Statistically significant differences in the participants' forced expiratory volume for one second (FEV1) and predicted forced expiratory volume for one second (predicted FEV1) were found among the three groups. No statistically significant differences in the participants' forced vital capacity (FVC), predicted forced vital capacity (predicted FVC), FEV1/FVC, and peak expiratory flow (PEF) were found among the three groups. Furthermore, a significant positive correlation was found between CVA and FVC and among the predicted FVC, FEV1, and predicted FEV1. Conclusions: The results of this study demonstrate that severe forward head posture has a negative effect on pulmonary function in young women.

• Journal of Veterinary Clinics
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• v.38 no.1
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• pp.32-35
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• 2021

Three dogs (a 30-month-old spayed female English bulldog; a 12-month-old castrated male English bulldog; a 19-month-old castrated male Shar-pei dog) were presented to the Dana Animal Hospital Eye Center with clinical signs of blepharospasm, epiphora, and ocular discharge (serous to mucopurulent) in one or both eyes. Through ophthalmic examination, the dogs (5 eyes) were diagnosed with trichiasis caused by upper and lower eyelid entropion, including the lateral canthus. To correct upper and lower eyelid entropion, modification using a combination of the Stades forced granulation method for upper eyelid entropion and Hotz-Celsus procedure for lower eyelid entropion was performed in all cases. At the last follow-up, mean 274 days after surgery, clinical signs disappeared and no recurrences of entropion were observed in any of the 3 dogs (5 eyes). Therefore, the combination of the Stades forced granulation method and Hotz-Celsus procedure may be an effective treatment for trichiasis caused by upper and lower eyelid entropion in dogs.