• Title/Summary/Keyword: Treatment of structural level

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Application of a fixed Eulerian mesh-based scheme based on the level set function generated by virtual nodes to large-deformation fluid-structure interaction

  • Hashimoto, Gaku;Ono, Kenji;Okuda, Hiroshi
    • Interaction and multiscale mechanics
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    • v.5 no.3
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    • pp.287-318
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    • 2012
  • We apply a partitioned-solution (iterative-staggered) coupling method based on a fixed Eulerian mesh with the level set function to a large-deformation fluid-structure interaction (FSI) problem where a large-deformable thin structure moves in a high-speed flow field, as an airbag does during deployment. This method combines advanced fluid and structure solvers-specifically, the constrained interpolation profile finite element method (CIP-FEM) for fluid Eulerian mesh and large-deformable structural elements for Lagrangian structural mesh. We express the large-deformable interface as a zero isosurface by the level set function, and introduce virtual nodes with level sets and structural normal velocities to generate the level set function according to the large-deformable interfacial geometry and enforce the kinematic condition at the interface. The virtual nodes are located in the direction normal to the structural mesh. It is confirmed that application of the method to unfolded airbag deployment simulation shows the adequacy of the method.

Treatment of Forward Head Posture & Shoulder Instability (턱을 앞으로 내민자세와 견관절 불안정 의 치료)

  • Bae, Sung-Soo
    • Journal of the Korean Society of Physical Medicine
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    • v.2 no.2
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    • pp.219-228
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    • 2007
  • Objective : The purpose of this study was conducted to find treatment of forward head posture and shoulder instability with proprioceptive neuromuscular facilitation concept. Methods : This is literature study with books, seminar note and international course. Results : Forward head posture and shoulder instability has related each other. Forward head posture will make muscle instability, weakness and stiffness on neck and shoulder girdle. It will make pain also. Important muscle are suboccipital muscle, omohyoid muscle, sternoclaidomastoid muscle, scaleni, pectoralis minor, levator scapular and digastric. Conclusion : Treatment of the forward head posture and shoulder instability is provided. It is that treatment of stiff muscle with eccentric muscle work, muscle elongation, muscle strengthening at the structure level and at the functional level for daily activities.

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Treatment of Forward Head Posture and Shoulder Instability (턱을 앞으로 내민 자세와 견관절 불안정의 치료)

  • Bae, Sung-Soo;Kim, Sik-Hyun;Kim, Sang-Soo
    • PNF and Movement
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    • v.5 no.2
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    • pp.1-10
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    • 2007
  • Purpose : The purpose of this study was conducted to find treatment of forward head posture and shoulder instability with proprioceptive neuromuscular facilitation concept. Methods : This is literature study with books, seminar note and international course. Results : Forward head posture and shoulder instability has related each other. Forward head posture will make muscle instability, weakness and stiffness on neck and shoulder girdle. It will make pain also. Important muscle are suboccipital muscles, omohyoid muscle, sternoclaidomastoid muscle, scaleni, pectoralis minor, levator scapular and digastric. Conclusion : Treatment of the forward head posture and shoulder instability is provided. It is that treatment of stiff muscle with eccentric muscle work, muscle elongation, muscle strengthening at the structure level and at the functional level for daily activities.

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A Stratege of Treatment Approach in the Proprioceptive Neuromuscular Facilitation (고유수용성 신경근 촉진법의 치료 접근 전략)

  • Bae, Sung-soo;Choi, In-soo;Kim, Sang-soo
    • PNF and Movement
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    • v.2 no.1
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    • pp.49-57
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    • 2004
  • Objective : The purpose of this study was conducted to find treatment approach, functional test process with proprioceptive neuromuscular facilitation(PNF). Method : This is a literature study with books, seminar note and book for PNF international course. Result : Suggest of the functional test with functional level and structural level treatment approaching with hypotheses and problem list from the functional test and provide how, what, where for the treatment with the level. Conclusion : Treatment plan and approach has changed from disease to structure function, performance, participation the life, relationship with environment factors of human being. For the treatment approach need the functional test and functional goal.

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Effects of Low Level Laser Treatment Applied to KI 1 on the Gait Behavior in the Rat Model of CFA-Induced Arthritis (흰쥐 관절염 모델에서 용천 저출력 레이저 자극이 보행행동에 미치는 영향)

  • Ji, Byeong Uk;Li, Chengjin;Lee, Ji Eun;Koo, Sungtae
    • Korean Journal of Acupuncture
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    • v.32 no.1
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    • pp.30-38
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    • 2015
  • Objectives : The aim of the study is to investigate the effects of low level laser treatment (LLLT) on the gait behavior in the rat model of arthritis. Methods : Knee arthritis was induced by the injection of $125{\mu}l$ of Complete Freund's Adjuvant(CFA) into the right hind knee joint cavity. Arthritic rats were divided 3 groups; arthritis group was used for control(CON), 10 min of laser treated group(LSR10), and 30 min of laser treated group(LSR30). LLLT was applied to KI 1 for 11 times under gaseous anesthesia. We performed several analyses under catwalk test including stand and swing time, duty cycle of paw steps, intensity and print area of steps, and stride length. Results : Stand and duty cycle of paw steps were increased significantly at 12 days after arthritis induction in LSR30 group. Swing time was decreased significantly at 12 days after arthritis induction in LSR10 group. In the analysis of intensity, print area and stride length, however, results did not show statistical significance during the time point of experiments. Conclusions : The data suggest that LLLT on the rat model of CFA induced arthritis showed beneficial effects by increase of stand time and duty cycle of paw steps and decrease of swing time. Therefore, LLLT could be useful option to improve gait discomfort in arthritis patients.

A Clinical Trial for Two Adolescent Patients with Structural Spinal Scoliosis (청소년기의 구조적 척추 측만증 치험 2례)

  • Hong, Sang-Joon;Choi, Ka-Hye;Song, In-Sun;Lee, Chul-Hwi
    • The Journal of Pediatrics of Korean Medicine
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    • v.24 no.3
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    • pp.50-57
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    • 2010
  • Objectives: The purpose of this study is to report two cases of adolescent patient with structural spinal scoliosis treated by Chuna therapy. Methods: We examined two adolescent patients with an X-ray examination. These patients were diagnosed with structural scoliosis, and we used acupuncture and Chuna method at these patients. Cobb's angle and VAS(Visual Analogue Scale) were used to evaluate effects of the treatment. Results and Conclusions: After the treatment, we got these improvement results : In one case, the Cobb's angle was improved by $8.4^{\circ}$ ($19^{\circ}$ to $10.6^{\circ}$) at thoracic level (44.2% correctability) and VAS has been changed from 5 to 1-2. In another case, the Cobb's angle was improved by $4.3^{\circ}$($11.3^{\circ}$ to $7^{\circ}$) at lumbar level(38.0% correctability) and VAS has been changed from 7 to 1-2.

Roads to Construct and Re-build Plant Microbiota Community

  • Kim, Da-Ran;Kwak, Youn-Sig
    • The Plant Pathology Journal
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    • v.38 no.5
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    • pp.425-431
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    • 2022
  • Plant microbiota has influenced plant growth and physiology significantly. Plant and plant-associated microbes have flexible interactions that respond to changes in environmental conditions. These interactions can be adjusted to suit the requirements of the microbial community or the host physiology. In addition, it can be modified to suit microbiota structure or fixed by the host condition. However, no technology is realized yet to control mechanically manipulated plant microbiota structure. Here, we review step-by-step plant-associated microbial partnership from plant growth-promoting rhizobacteria to the microbiota structural modulation. Glutamic acid enriched the population of Streptomyces, a specific taxon in anthosphere microbiota community. Additionally, the population density of the microbes in the rhizosphere was also a positive response to glutamic acid treatment. Although many types of research are conducted on the structural revealing of plant microbiota, these concepts need to be further understood as to how the plant microbiota clusters are controlled or modulated at the community level. This review suggests that the intrinsic level of glutamic acid in planta is associated with the microbiota composition that the external supply of the biostimulant can modulate.

Estimation of the Dynamic Load of the Utility in Building by TPA Method (건물 바닥 구조 해석 모드의 튜닝)

  • Jeong, Min-Ki;Kwon, Hyung-O;Kim, Hyo-Beom;Lee, Jeong-Ha;Lee, Sang-Yeop
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.441-446
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    • 2008
  • The source transfer receiver model ('Source $\times$ Transfer = Response' model) which is widely used by NVH development process of vehicle/transport/machinery to analyze effectively and manage efficiently the structural dynamic behavior is also applicable to construction structure. If the evaluation assessment of the vibration level does not meet the target level, there are two methods, one is source treatment or replacement and the other is the reduction treatment on the transfer structure. In case of source treatment, it is done by source supplier and so, the latter is more practical method to reduce the vibration level. In this study, in order to get the accurate Transfer FE model(floor structure FE model), Experimental modal analysis of part of floor structure and FEM modal analysis of full floor structure are performed, then updating of FE model is performed after correlation analysis between these two results and finally, the modal model and FRF are compared between FE and Experimental results.

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Nonlinear Structural Analysis of the Spent Nuclear Fuel Disposal Canister Subjected to an Accidental Drop and Ground Impact Event (추락낙하 사고 시 지면과 충돌하는 고준위폐기물 처분용기의 비선형구조해석)

  • Kwon, Young-Joo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.32 no.2
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    • pp.75-86
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    • 2019
  • The biggest obstacle in the nuclear power generation is the high level radioactive waste such as the spent nuclear fuel. High level radioactivities and generated heat make the safe treatment of the spent nuclear fuel very difficult. Nowadays, the only treatment method is a deep geological disposal technology. This paper treats the structural safe design problem of the spent nuclear fuel disposal canister which is one of the core technologies of the deep geological disposal technology. Especially, this paper executed the nonlinear structural analysis for the stresses and deformations occurring in the canister due to the impulsive force applied to the spent nuclear fuel disposal canister in the case of an accidental drop and ground impact event from the transportation vehicle in the repository. The main content of the analysis is about that the impulsive force is obtained using the commercial rigid body dynamic analysis computer code, RecurDyn, and the stress and deformation caused by this impulsive force are obtained using the commercial finite element static structural analysis computer code, NISA. The analysis results show that large stresses and deformations may occur in the canister, especially in the rid or the bottom of the canister, due to the impulsive force occurring during the collision impact period.

A Comparative Study on Korean Reading Comprehension by Adjusting Vocabulary Levels (수준별 어휘 조정에 따른 한국어 읽기 텍스트 이해도 비교 연구)

  • Ju, Jae-hwan
    • Journal of Korean language education
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    • v.29 no.4
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    • pp.201-223
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    • 2018
  • The purpose of this study is to observe the effects of text modification by comparing differences in Korean reading comprehension levels that arise from differences in vocabulary levels in texts. This study intends to use simplified texts with the vocabulary difficulty adjusted differently from the original text to measure reading comprehension levels of Korean learners and analyze the result. To measure reading comprehension, the researcher divided 55 Korean learners of intermediate to advanced level of fluency into two groups; the control group read the original text and the treatment group read a simplified text in which complex vocabulary were substituted with easier words of medium difficulty. Then the two groups were tested with the same questionnaire to measure comprehension levels of each group. The result showed that the groups that read simplified texts scored higher than the control group; this suggests that the reading comprehension level was increased in the treatment group. The experiment confirmed that unknown vocabulary density has direct impact on Korean reading comprehension. The result shows that the proportion of unknown vocabulary should be reduced for meaning-focused reading. It also demonstrates that comprehension of the learner was enhanced with lexical simplification rather than structural simplification i.e. simplification of grammar or sentences. Thus, diverse reading materials adjusted to the learners' level of fluency should be developed to enable reading for learning Korean. By reducing the burden of understanding the meaning of each vocabulary, learners will be able to achieve the initial goal of reading.