• 대한수학회보
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• 제53권2호
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• pp.423-440
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• 2016

The bubble stabilization technique of Chebyshev-Legendre high-order element methods for one dimensional advection-diffusion equation is analyzed for the proposed scheme by Canuto and Puppo in [8]. We also analyze the finite element lower-order preconditioner for the proposed stabilized linear system. Further, the numerical results are provided to support the developed theories for the convergence and preconditioning.

• Structural Engineering and Mechanics
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• 제63권6호
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• pp.743-750
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• 2017

Modal parameter identification plays a key role in the structural health monitoring (SHM) for civil engineering. Eigensystem realization algorithm (ERA) is one of the most popular identification methods. However, the complex environment around civil structures can introduce the noises into the measurement from SHM system. The spurious modes would be generated due to the noises during ERA process, which are usually ignored and be recognized as physical modes. This paper proposes an improved stabilization diagram method in ERA to distinguish the spurious modes. First, it is proved that the ERA can be performed by any two Hankel matrices with one time step shift. The effect of noises on the eigenvalues of structure is illustrated when the choice of two Hankel matrices with one time step shift is different. Then, a moving data diagram is proposed to combine the traditional stabilization diagram to form the improved stabilization diagram method. The moving data diagram shows the mode variation along the different choice of Hankel matrices, which indicates whether the mode is spurious or not. The traditional stabilization diagram helps to determine the concerned truncated order before moving data diagram is implemented. Finally, the proposed method is proved through a numerical example. The results show that the proposed method can distinguish the spurious modes.

• The Journal of Korean Physical Therapy
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• 제28권2호
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• pp.136-141
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• 2016

Purpose: In this study experiments were performed during 6 weeks with 40 adults, 20 subjects in the waist stabilization exercise with blood flow restriction group and 20 subjects in the waist stabilization exercise without blood flow restriction group, in order to determine the impact of waist stabilization exercise on White Area Index (WAI) followed by blood flow restriction. Methods: Thickness of external oblique abdominal muscle, internal oblique abdominal muscle, and transversus abdominis muscle, as well as density and WAI of external oblique abdominal muscle were measured, followed by performance of repeated ANOVA. Results: Significant difference in thickness of external oblique abdominal muscle according to periodical difference was observed between groups (p<0.05). Significant difference in thickness of internal oblique abdominal muscle and transversus abdominis muscle according to periodical difference was observed between groups (p<0.05). Significant difference in density and WAI of external oblique abdominal muscle according to periodical difference was observed between groups (p<0.05). Conclusion: In conclusion, significant difference was observed after waist stabilization exercise with blood flow restriction. These results can be used as basic data for future research on waist stabilization exercise and blood flow restriction exercise.

• The Journal of Korean Physical Therapy
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• 제28권4호
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• pp.249-253
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• 2016

Purpose: The purpose of this study was to examine the influence of multi-directional dynamic stabilization exercise on the thickness of the external oblique abdominis, internal oblique abdominis, and transversus abdominis. Methods: For the study subjects, 40 adults were taken and divided into two groups and stabilization exercise was performed for 6 weeks. Changes in muscle thickness during the pre-experimental period, and at 2 weeks, 4 weeks, and 6 weeks were analyzed using repeated ANOVA. Results: The thickness of the external oblique abdominis, internal oblique abdominis, and transversus abdominis in the multi-directional dynamic stabilization exercise group showed significant differences per period and an interaction was observed between period and group (p<0.01), while there were no significant differences in changes per group (p>0.05). Conclusion: The effects of multi-directional stabilization exercises on abdominal muscle thickness differed. The results presented herein can be utilized as basic data for future studies and in development of rehabilitation treatments.

• PNF and Movement
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• 제15권3호
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• pp.291-302
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• 2017

Purpose: The purpose of this study was to describe the effects of neck and trunk stabilization exercise on the onset time of trunk muscle contraction in the elderly. Methods: Elderly subjects were divided into 2 groups: a neck and trunk stabilization exercise group (NTSG) and a control group (CG). The NTSG performed both neck and trunk stabilization exercises and the CG performed gait training on a treadmill, at 30 min per session, 3 times per week, over 8 weeks. Surface electromyography was employed to measure the onset times of trunk muscle contractions in the right anterior deltoid, rectus abdominis, external oblique abdominis, internal oblique abdominis, and erector spinae muscles. Results: The NTSG subjects showed earlier and statistically significant onset of contraction in trunk muscles as compared to the CG. Conclusion: The combination of neck and trunk stabilization exercises may more effectively improve the onset of muscle contractions in the elderly than other types of exercise. The present study's findings may be used as basic data for the development of exercise programs suitable to the elderly, specifically for the design of home exercise programs.

• The Journal of Korean Physical Therapy
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• 제30권1호
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• pp.8-13
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• 2018

Purpose: The present study was to investigate effects of scapular position and pain on a trunk stabilization exercise with gym ball for patients with arthroscopic rotator cuff repair. Methods: Subjects were patients after 2 weeks of rotator cuff repairs. Subjects were randomly assigned to conservative treatment group (CTG, n=10) or trunk stabilization with gym ball group (SBG, n=10), and participated one of those groups for 2 weeks. Measurements about pain and scapular position were assessed in before and after treatment programs. Results: Pain reduced in both rest and night in SBG compared to CTG. In the case of scapular position, decreased scapular retraction (increased protraction) was found in CTG and vice versa in SBG. Reduced scapular anterior tilting was also found on SBG. Conclusion: The present study showed that early performed trunk stabilization with gym ball could bring a scapular alignment that increases subacromial space and reduces pain. This suggests early trunk stabilization with gym ball programs to restore shoulder functions for patients with rotator cuff repair.

• 대한통합의학회지
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• 제6권2호
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• pp.37-44
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• 2018

Purpose : The aim of this study is to compare the trunk muscle activities in trunk stabilization on the stable and unstable supporting surfaces using by sEMG. Methods : The subjects of this study include seventeen male. We measured sEMG activities of rectus abdominis and erector spine in subjects during trunk stabilization such as plank exercise, quadruped position, quadruped position with rising hand and foot on the stable and unstable surface. Results : sEMG activities in plank exercise was significantly higher in left rectus abdominis and left erector spine on unstable surface then stable surface (p<.05). sEMG activities of left rectus abdominis and left erector spine in quadruped position was significantly higher in unstable surface than stable surface (p<.05). In comparison with posture, Plank exercise showed a significant difference increase other postures (p<.05). Conclusion : sEMG activities of muscle in trunk stabilization was significantly higher in unstable surface than stable surface and plank exercise. So, we suggest that trunk stabilization on the unstable supporting surface and plank exercise were more effective method than stable surface to improve trunk muscles activities.

• The Journal of Korean Physical Therapy
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• 제20권1호
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• pp.23-31
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• 2008

Purpose: The purpose of this study was finding out the effects of spinal stabilization exercise using Centaur which is a 3D spinal stabilization sports implement on Chronic low back pain patients over 8 weeks. Methods: 30 patients with DDD were observed during the study. Their average age was 66.88years, height was 152.12cm and average weight was 58.91kg, 4 males and 26 females were involved. 8 various investigations were performed and varied values were compared with reinvestigation done after having exercised 8 weeks using 3-D CENTAUR We used VAS(visual analog scale) in order to see the variation of pain intensity, MOI(modified oswestry index) in order to see limitation of daily life. Results: VAS was lessened from 7.57 to 2.63, limitation of routine life(MOS) from 23.48 to 11.30, there were remarkable differences statistically(p<0.05). As a result of muscular investigation for static spinal stabilization by 8 variations of body deflection, muscular strength were all increased and there were signigicant differences statistically(p<0.05). Conclusion: It has turned out that pain and limitation of routine life was lessened, as a result of 8 weeks exercise using CENTAUR, and deep muscular power was increased. Thus it has turned out that 3-D spinal stabilization exercise has an effect on the strengthening spinal muscles and alleviation of their pain for old patients with DDD.

• 대한정형도수물리치료학회지
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• 제17권2호
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• pp.33-39
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• 2011

Background: The purpose of this study was to verify the most effective spinal stabilization exercise program by comparing the activities of muscles contributing to spinal stabilization during 2 types of exercises using 3-D NEWTON and a Gym-ball. Methods: We divided sixteen healthy students to two groups in D city were recruited and each subjects performed two type of exercise. Exercise 1 was performed 3-D NEWTON spinal stabilization training during 4 weeks (n=8). Exercise 2 was performed special training program that use a Gym-ball during 4 weeks (n=8). Results: The group of 3-D NEWTON applying lumbar stabilization kinetic program was increased 18.8s after training. Conclusions: It was revealed the statically significant difference between 3-D NEWTON and Gym-ball lumbar stabilization exercise groups. Therefore it has been turned out that 3-D NEWTON and Gym-ball lumbar stabilization exercise has an effect on the abdominis and trunk muscle strengthening and balance.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.731-738
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• 2002

Recently, as large constructions on the coast are performed frequently, surface layer stabilization method which Is one of the improvement methods for dredged soft clay has been applied. However, there have been few studies about the surface layer stabilization method. The purpose of this study is to clarify characteristics of ultra-soft marine clay and hardening agent. Also, optimal mixture ratio of hardening agent was verified through the laboratory tests such as statistical analysis and pilot tests. Laboratory tests were performed with proper hardening agent and test soil and standard mixing tables of hardening agent were determined according to ground conditions through statistical analysis. Also, applicability of surface layer stabilization method to field was verified by pilot tests. From the results of the tests, it was found that hardening agent materials such as cement, slag, fly-ash, inorganic salts, arwin, gypsum etc. affect on the appearing compressive strength. It was defined optimal mixture ratio which satisfies the required compressive strength from the statistical analysis. Also, It was compared the effect of ground improvement by cements and hardening agents through the pilot tests. This study will serve as data for design or construction criteria of stabilization of surface layer on ultra-soft marine clay.