• Title/Summary/Keyword: core strengthening

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Effects of Core Exercise Program on the Low Back Function in Private Guard and Security (경호원들의 코어프로그램 수행과 요추부 기능개선에 관한 연구)

  • Kang, Min-Wan
    • Korean Security Journal
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    • no.21
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    • pp.1-18
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    • 2009
  • Background: This study was to investigate the effects of spinal strengthening exercise and lumbar stabilization exercise(core exercise program) on trunk muscle strength, flexibility and balance, lumbar function. The subjects of this study were the eighteen subjects who was registered in private guard company. The each exercise group of 9 persons were chosen by random controlled trial. Methods: We used instrument BTE, Libra, Ruler Measuring tape to measured trunk muscle strength, flexibility, balance and lumbar function. Results: The result of this study were summarized below; The flexor muscle strength was improve in lumbar stabilization exercise(core exercise) group(p<.05). The extensor muscle strength was improve in lumbar stabilization exercise(core program) group(p<.05). The trunk flexibility was improve in spinal strengthening exercise group and lumbar stabilization exercise group(p<.05). The balance ability was improve in spinal strengthening group and lumbar stabilization exercise group(core program) group(p<.05). Conclusion: With the above results, demonstrated effects of spinal strengthening exercise and lumbar stabilization exercise in each private guard and security in this study.

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Development of the Reading Guidance Course for Strengthening Core Competencies among College Students (대학생의 핵심역량 강화를 위한 독서지도 과목 개발에 관한 연구)

  • Lee, Myeong-Hee
    • Journal of the Korean Society for Library and Information Science
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    • v.46 no.3
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    • pp.79-102
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    • 2012
  • Higher educational institutions face an increasing demand for developing a renewed set of competencies of college students who will live in the knowledge-based society. However, relatively little is known about what constitutes the core competencies that college students need to develop and how we can improve them. Nine categories of core competencies required for college graduates were drawn from the previous research and examples of core competencies developed by other institutions. They are analytic thinking skills, problem-solving skills, communicating skills, collaborative working skills, and etc. A reading guidance course for strengthening core competencies, developed based on the teaching and learning methods was adapted to students of LIS for one semester. Implications of these and related findings are discussed.

Angular Differences between the Lower Extremity and the Ground that Express Maximum Core Muscle Activation According to Core-strengthening Exercises

  • Son, Nam Jeong;Jun, Hyun Jeong;Yi, Kyung Ock
    • Korean Journal of Applied Biomechanics
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    • v.27 no.4
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    • pp.247-255
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    • 2017
  • Objective: The purpose of this study was to investigate the maximum core muscle activation angle according to core-strengthening exercises. Method: Twenty-six young female football players (age: $17.84{\pm}0.80years$, height: $163.08{\pm}5.25cm$, weight: $54.96{\pm}7.41kg$) registered in the Korea Football Association from D High School located in Seoul were the subjects of this research. An electromyogram (Noraxon, USA) was used for monitoring the maximum core muscle contraction activity. Results: The angle for the maximum core muscle strength per core exercise and muscle was the smallest for the upper rectus abdominis in the windshield wiper exercise. The angle of the vastus medialis was significantly the largest. The range of angles at which the maximum strength was observed for each core exercise were as follows: 1) abdominal flutter kicks ($11{\sim}40^{\circ}$), 2) leg raises ($21{\sim}34^{\circ}$), 3) scissors ($45{\sim}66^{\circ}$), 4) knee to elbow sit-ups ($42{\sim}64^{\circ}$), 5) reverse crunches ($9{\sim}40^{\circ}$), 6) butt-ups ($24{\sim}32^{\circ}$), 7) V sit-ups ($5{\sim}24^{\circ}$), 8) windshield wipers ($11{\sim}20^{\circ}$), 9) bird dog ($11{\sim}18^{\circ}$), and 10) raised leg plank ($38{\sim}50^{\circ}$). Conclusion: Four kinds of motion could be classified according to the range of angles at which the core muscles were maximally activated. The first group involves the range of motion that gives the maximum muscle strength when the lower extremity and ground angle was between $5^{\circ}$ and $24^{\circ}$, such as the V sit-ups, windshield wipers, and bird dog. The second group comprised the flutter kicks and reverse crunches at an angle between $9^{\circ}$ and $40^{\circ}$. The third group comprised the leg raise and butt-up exercises at an angle between $21^{\circ}$ and $34^{\circ}$. The fourth group included the scissors, knee to elbow sit-ups, and raised leg plank at an angle between $38^{\circ}$ and $66^{\circ}$. These results may be useful as basic data for core movement and core muscle training according to the purpose of exercise.

A Study on the Development of Capstone Design Competency Program - Focusing on 21C Core Competencies(4C Skills & Problem Solving Ability) - (캡스톤디자인 역량 강화 프로그램 개발 연구 - 21C 핵심역량(4C Skills 및 문제해결능력) 함양을 중심으로 -)

  • Han, Soomin
    • Journal of Engineering Education Research
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    • v.26 no.1
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    • pp.20-26
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    • 2023
  • In this study, as a competency strengthening program to support learner-centered education, we developed the 'Capstone-design competency Program' for the purpose of cultivating the 4C skills and problem-solving ability required as core competencies of the 21st century. The program was based on the project method, and strategies were derived and materialized for each step through core competency analysis. Then, the validity was confirmed through the implementation of the program. As a result of the implementation of the program, it was confirmed that this program was effective in cultivating the core competencies of college students. In addition, it was confirmed that learners showed results such as specific reflection on core competencies, changes in perspective, and action plans, so that the possibility of actual application was high.

Shake table responses of an RC low-rise building model strengthened with buckling restrained braces at ground story

  • Lee, Han Seon;Lee, Kyung Bo;Hwang, Kyung Ran;Cho, Chang Seok
    • Earthquakes and Structures
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    • v.5 no.6
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    • pp.703-731
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    • 2013
  • In order to verify the applicability of buckling restrained braces (BRB's) and fiber reinforced polymer (FRP) sheets to the seismic strengthening of a low-rise RC building having the irregularities of a soft/weak story and torsion at the ground story, a series of earthquake simulation tests were conducted on a 1:5 scale RC building model before, and after, the strengthening, and these test results are compared and analyzed, to check the effectiveness of the strengthening. Based on the investigations, the following conclusions are made: (1) The BRB's revealed significant slips at the joint with the existing RC beam, up-lifts of columns from RC foundations and displacements due to the flexibility of foundations, and final failure due to the buckling and fracture of base joint angles. The lateral stiffness appeared to be, thereby, as low as one seventh of the intended value, which led to a large yield displacement and, therefore, the BRB's could not dissipate seismic input energy as desired within the range of anticipated displacements. (2) Although the strengthened model did not behave as desired, great enhancement in earthquake resistance was achieved through an approximate 50% increase in the lateral resistance of the wall, due to the axial constraint by the peripheral BRB frames. Finally, (3) whereas in the original model, base torsion was resisted by both the inner core walls and the peripheral frames, the strengthened model resisted most of the base torsion with the peripheral frames, after yielding of the inner core walls, and represented dual values of torsion stiffness, depending on the yielding of core walls.

Investigations on the influence of radial confinement in the impact response of concrete

  • Al-Salloum, Yousef;Alsayed, Saleh;Almusallam, Tarek;Ibrahim, S.M.;Abbas, H.
    • Computers and Concrete
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    • v.14 no.6
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    • pp.675-694
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    • 2014
  • Annular and solid concrete specimens with different aspect ratios and static unconfined compressive strengths were studied for impact loading using SHPB test setup. Numerical simulations in LSDYNA were also carried out and results were validated. The stress-strain curves obtained under dynamic loading were also compared with static compressive tests. The mode of failure of concrete specimen was a typical ductile failure at high strain rates. In general, the dynamic increase factor (DIF) of thin solid specimens was higher than thick samples. In the numerical study, the variation of axial, hydrostatic and radial stresses for solid and annular samples was studied. The core phenomenon due to confinement was observed for solid samples wherein the applied loads were primarily borne by the innermost concrete zone rather than the outer peripheral zone. In the annular samples, especially with large diameter inside hole, the distribution of stresses was relatively uniform along the radial distance. Qualitatively, only a small change in the distribution of stresses for annular samples with different internal diameters studied was observed.

Experimental Study and Confinement Analysis on RC Stub Columns Strengthened with Circular CFST Under Axial Load

  • Liang, Hongjun;Lu, Yiyan;Hu, Jiyue;Xue, Jifeng
    • International journal of steel structures
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    • v.18 no.5
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    • pp.1577-1588
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    • 2018
  • As the excellent mechanical performance and easy construction of concrete filled steel tubes (CFST) composite structure, it has the potential to be used to strengthen RC pier columns. Therefore, tests were conducted on 2 reinforcement concrete (RC) stub columns and 9 RC columns strengthened with circular CFST under axial loading. The test results show that the circular CFST strengthening method is effective since the mean bearing capacity of the RC columns is increased at least 3.69 times and the ductility index is significantly improved more than 30%. One of the reasons for enhancement is obvious confinement provided by steel tube besides the additional bearing capacity supplied by the strengthening materials. From the analysis of the enhancement ratio, the strengthening structure has at least an extra 20% amplification except for taking full advantage of the strength of the strengthening material. Through the analysis of confining stress provided by steel tube and the stress-strain relationship of confined concrete, it is found that the strength of the core concrete can be increased by 21-33% and the ultimate strain can be enhanced to beyond $15,000{\mu}{\varepsilon}$.

The core stabilization effect of respiratory muscle training to promote the health of the elderly (노인 건강 증진을 위한 호흡근 트레이닝의 코어 안정화 효과)

  • Kim, Ji-Sun
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.3
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    • pp.496-508
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    • 2020
  • This study reviews studies on the core stabilization of respiratory muscle training for the elderly health. Previous research data and presenting basic literature data suggest that respiratory activation is an important mechanism for core strengthening via exercise interventions for the elderly. The review found that first, the mechanism of improving the respiratory muscles weakened by aging to address the loss of core function due to old age sarcopenia among the elderly results entails promoting the autonomic nervous system by focusing on the respiratory muscle activation pattern, the core muscle sensation mobilized for body centering. Second, nerve roots, intraperitoneal pressure, and deep muscles in the trunk of the body can be promoted while controlling respiratory stimulation with cognitive feedback. Effortful inspiration increases the activation of respiratory assistive muscles and effortless exhalation can improve the core muscle mobilization by involving abdominal muscles. Third, through respiratory muscle training, the elderly can increase their awareness of spinal centering and improve the ability to control the deep core muscles that must be mobilized for core stabilization. In conclusion, respiratory muscle training to increase the utilization of the trunk muscles seems to be a useful core stabilization exercise for the elderly with chronic tension and joint degeneration.

A Experimental Study on the Repair Performance of Crack Using Chloride ion Penetration (염소이온 투과실험을 이용한 균열보수성능 평가에 관한 시험적 연구)

  • 심종성;문도영;김언경
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.503-508
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    • 2001
  • With difference to strengthening which could be evaluated structural efficiency, it is hard to do quantitative repair efficiency evaluation achieved compressive strength test or appearance investigation. In this paper, chloride ion penetration test is exacted to core specimens picked from repaired structure for quantitative repair evaluation. The result of experimentation shows repair efficiency quantitatively by means of difference between penetration amount of chloride ion for repaired and unrepaired core specimens.

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Construction & Services of Regional Information Network for Changwon & Masan Industrial Complex (창원.마산 지역정보유통망 구축 연구)

  • Jo, Yu-Seop;Jeon, Hyeong-Deok
    • 연구논문집
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    • s.26
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    • pp.69-84
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    • 1996
  • Regional INformation Network Center has constructed integrated VAN among the heterogeneous computers and core technical information database for machinery & materials-oriented enterprises in the Changwon & Masan Industrial complex. As the result of RINNet project, regional industrial companies can take advantage of getting core technical information for developing new technology and strengthening competitive power. Accordingly, RINNet(Regional INformation Network for science & technology) makes regional industrial companies possible to collect, acquire and use technical information rapidly and motivates regional society to form the rapid technical interchange system and cooperative system among industrial-educational-institutal complex.

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