• Journal of The Geomorphological Association of Korea
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• v.20 no.4
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• pp.133-145
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• 2013

There are many traditional natural heritages, so-called Dongcheon-gugok, in the Sobaek mountainous region ranged from Sangju city to Mungyeong city. Because Yongyu-dong has the beautiful scenery, well conserved, and many related documents, making amusing storytelling is allowed. Therefore, this study is to construct the storytelling by putting together the geomorphological explanation of topographical landscape and travel writing or poetry and prose by ancient people. The main themes of storytelling are the sculpture of the letter, gutters and pot holes on the broad and flat rock, and the arguments of the forming processes of Yong-choo. I expect this storytelling to help understanding and symphasizing the traditional natural heritages.

• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.1
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• pp.104-111
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• 2017

A new explosive bellows, which has a diameter of 8.0 mm and a length of 25.4 mm, was developed for a warhead fuze. The new explosive bellows delivers a thrust of 4.5 kgf over a stroke of 25.4 mm. A new gas generator containing BP/MTV ignition charge was also developed and the output test equipment, which measures the length of spring compressed by the function of explosive bellows, was also devised. In order to find out that the new explosive bellows meets the design requirements, the sensitivity tests and output tests were conducted. The test results show that the new explosive bellows meets the requirements and can be applicable to a warhead fuze.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.24 no.2
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• pp.59-67
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• 2018

Background: The purpose of this study was to investigate the effects of gluteus medius strength exercise on the ankle stability of high school student with chronic ankle sprains. Methods: A total of 30 participants were divided two groups. Experimental group was 15 participants applied gluteus medius strength exercise. Control group was 15 participants performing ankle strength exercise. This study was performed for 50 minutes per day, three a week for 6 weeks. All measurements were taken to a pre and post test. Strength was measured using Power Track ll. Balance was measured using Biodex balance system for Limits of Stability and Postural Stability. Ankle Stability was measured using Cumberland Ankle Instability Tool (CAIT). Results: In the case of gluteus medius strength, there were statistically significant differences between the experimental group and the control group. For ankle stability were statistically significant differences within the experimental group according to measurements taken by Limits of Stability, Postural Stability, and CAIT. A between group comparison showed a statistically significant difference for CAIT only. Conclusion: According to our measurements it appears that gluteus medius strength training was effective in benefiting muscular strength, balance and ankle stability among the physical education.

• Journal of The Korean Society of Integrative Medicine
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• v.7 no.3
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• pp.181-188
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• 2019

Purpose: This study was performed to determine the effects of a gluteus maximus strengthening exercise on both spinal alignment and dynamic balance in subjects with kyphosis. Methods: We measured the kyphosis angle of 150 subjects and selected those whose kyphosis angle was > $50^{\circ}$. The participants included 10 male and 12 female college students. After a gluteus maximus strengthening exercise was applied, the subjects were measured by the formetric 4D and Biorescue systems. The collected data were analyzed by a paired t-test with the SPSS (Ver. 21) program for spinal alignment and dynamic balance comparisons both before and after the gluteus maximus strengthening exercise was completed. Results: The results regarding spinal alignment showed statistically significant decreases in pelvic tilt, kyphotic angle, and lordotic angle after the intervention (p < .05). However, trunk imbalance, pelvic torsion, surface rotation, and lateral deviation were not significantly different after the exercise. The results of the dynamic balance showed statistically significant increases in limits of stability after the exercise (p < .05). Conclusion: The above results suggest that the implemented gluteus maximus strengthening exercise may be effective for spinal alignment and dynamic balance in subjects with kyphosis.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.26 no.2
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• pp.55-61
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• 2020

Background: This study demonstrate the effect of bridge exercise using sling device on the improvement of gluteal maximus and elector Spine EMG (electromyogram) in college student. Methods: 30 college students participated in this experiment and received bridge exercise using sling device for 30 minutes a day for four weeks. Results: The effects of bridge exercise using sling device were evaluated by measuring the muscle activation on gluteal maximus and elector spine. The differences between pre-test and post-test in G-max (p<.05) and right elector spine (p<.05) were significant. The difference between in G-max left and right side was not significant both before (p<.05) and after (p<.05) bridge exercise using sling. The difference between in elector spine left and right side was not significant before bridge exercise using sling (p<.05) but after bridge exercise using sling (p<.05). Conclusion: The results indicated that bridge exercise using sling device improved gluteal maximus and elector spine EMG. This study demonstrated the effectiveness of this new approach and provided a good guide to improve gluteal maximus and elector spine EMG.

• Journal of Korean Physical Therapy Science
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• v.29 no.2
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• pp.48-56
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• 2022

Background: This study was to identify the effects of blood flow restriction on gluteus muscles thickness, density, and white area index for children with cerebral palsy. Design: Randomized controlled trial. Methods: Twenty children with cerebral palsy were assigned randomly to an experimental (n=10) or control (n=10) group. The experimental group performed a bicycle exercise after blood flow restriction. The control group performed a bicycle exercise. The study used an ultrasonic instrument to measure gluteus muscles thickness, density, and WAI. Wilcoxon signed ranks test was used for determination of differences before and after treatment, and a Mannn-whitney U test was used for determination of differences between treatment groups. Results: As a result of comparison within groups, the experimental and control group showed significant difference for gluteus muscles thickness, density, and WAI after the experiment (p<0.05). In comparison between two groups, the experimental group showed more significant difference in gluteus muscles thickness, density, and WAI than the control group (p<0.05). Conclusion: Based on these results, a bicycle exercise after blood flow restriction effectively improved the gluteus muscles thickness, density, and WAI of children with cerebral palsy.

• Journal of The Geomorphological Association of Korea
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• v.17 no.4
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• pp.99-110
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• 2010

This study elucidates the interrelationship between climatic, morpological, and hydraulic milieu in the drainage basins of Keum-gae river from the viewpoint of ecogeography. The region of this basin is located at low-relief hills. Because hills are made up of granitic regolith by deep weathering, the rate of permeability is very high. And, the speed of drainage is very fast, and the deficit of water easily revealed and BOD is very high. Therefore a great deals of efforts are needed for the maintenance of stable milieu.

• Korea Trade Review
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• v.45 no.5
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• pp.161-179
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• 2020

The importance of entering the international market for small and medium-sized enterprises (SMEs) has been continuously emphasized. As a way to overcome these factors, prior studies have increased interest in dynamic capability. The purpose of this study is to investigate the effects of entrepreneurial orientation, learning orientation, and dynamic capability on their international performance of SMEs. Drawing on an extensive review of the literature on dynamic capability view and internationalization, hypotheses are developed and tested using a sample of 214 SMEs in South Korea. Structural equation modeling was applied. As a result of analysis, first, dynamic capability has a significant effect on international performance. Second, entrepreneurial orientation has significant influence on dynamic capability. Third, learning orientation has significant influence on dynamic capability. Lastly, slack resource was found to moderate the relationship between dynamic capability and international performance. The results indicate that their entrepreneurial orientation and learning orientation ware driver of their dynamic capability. and that their dynamic capability was significant driver of their international performance. In the final conclusion, implications and limitations of research and suggestions for future research are discussed.

• Transactions of Materials Processing
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• v.33 no.1
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• pp.18-35
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• 2024

In the present work, the evolution rules for the internal variables including continuum damage factors are obtained using the thermodynamic framework, which are in turn facilitated to derive the elastic-plastic constitutive relation for the particulate composites. Using the Mori-Tanaka scheme, the homogenization on state and internal variables such as back-stress and damage factors is carried out to procure the rate independent plasticity relations. Moreover, the degradation of mechanical properties of constituents is depicted by the distinctive damages such that the phase and interfacial damages are treated individually accordingly, whereas the kinematic hardening is depicted by combining the Armstrong-Frederick and Phillips' back-stress evolutions. On the other hand, the present constitutive relation for each phase is expressed in terms of the respective damage-free effective quantities, then, followed by transformation into the damage affected overall nominal relations using the aforementioned homogenization concentration factors. An emphasis is placed on the qualitative analyses for strain localization by observing the perturbation growth instead of the conventional bifurcation analyses. It turns out that the proposed constitutive model offers a wide range of strain localization behavior depending on the evolution of various internal variable descriptions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.11A
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• pp.924-932
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• 2011

In this paper, we propose a possibility of usage of carrier superpositioning scheme for a specific slow frequency hopping(SFH) transmission method for the satellite data link in which all of hopping carriers have to be synchronized to DSM transponder of our previous work and usage of frequency diversity in the saved frequency to overcome the SFH disadvantage against jammer. We have analyzed anti-jamming performance and LPI performance and confirmed that the proposed scheme can support data service with 18.5dB processing gain against the worst case partial band jamming and give 2.5dB gain in the LPI performance against D&M detector which can estimate the data rate of unknown signals.