• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.467-468
• /
• 2009

In this study, seismic capacity of R/C school buildings are investigated on the basis of the 2nd and 3rd level procedures of the Japanese Standard for Evaluation of Seismic Capacity of Existing R/C Buildings, push-over analysis and nonlinear dynamic analysis, respectively. In order to verify the applicability of the new method proposed in this study, relationships between evaluation results of the proposed methods shown in Part-2 and detailed evaluation methods mentioned above are compared.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 1993.10a
• /
• pp.87-92
• /
• 1993

본 연구에서는 반연성해석(Semi-coupling analysis) 즉 음향 응답이 구조와 음향 시스템의 모달 계수로 표현되는 방법과 구조-음향 연성계수를 이용한 소음저감의 예를 제시한다. 이전까지의 연성해석에서는 해석의 신뢰성을 위 하여 실험에서 구한 구조 모우드를 사용하였다. 그러나 설계단계에서 차실소 음을 예측하고 설계변경의 자료를 제시하기 위해서는 유한요소법을 이용한 예측이 필수적이다. 본 연구에서는 부분 구조 합성법, 주요 결합부에 상세 유한요소 모델의 정적해석등에 의한 등가모델링 기법, 감도해석을 이용한 결 합부 모델링기법을 이용한 유한요소법 구조모우드해석과 그 결과를 이용한 연성해석의 결과를 보여준다.

• 한국노년학
• /
• v.30 no.4
• /
• pp.1107-1116
• /
• 2010

The elderly people with advancing years have many problems such as the decline of the proprioceptive, visual & vestibular function and muscle weakness. Furthermore the decrease of the reflex which influences the balance ability in sudden change of the movement could cause the falls. The difficulty of the balance caused by the fear releated to the fall aggravates the Falls Efficacy and causes a lot of the disability of the independent activities of daily living. The purpose of this study was the effect of a Virtual Reality Program on Static Balance control and Fall efficacy of Elderly people. 14 elderly people(subjects) who were ≥65years of age partiripated in this study and they were divided into VR(Virtual Reality) group(n=7) and Control group (n=7). VR group took the general physical therapy & IREX and only the general physical therapy was carried out in the control group. VR group of intervention was carried out for 30min. total 8times. They were evaluated by BIO-Rescue, Fall Efficacy Scale before and after treatment. The Static Balance control and Fall efficacy were assessed by Bio-Rescue & Falls Efficacy Scale. The analysis of the resulf was assessed by Wilcoxon signed test & Mann-Whitney U test. The result showed that the static balance of VR group with the open eyes was improved in a static balance test and range of the movement was increased in limited of stability. And Falls Efficacy was also efficacious. IREX was effective to static balance control and Falls Efficacy of the elderly When we think about these effects, various treatments and objective assessments using VR program will be needed for the elderly

• The KIPS Transactions:PartA
• /
• v.11A no.5
• /
• pp.401-406
• /
• 2004

Among many algorithms for the integration problems in which one wants to compute the approximation to the definite integral in the average case setting, we study the average case errors of numerical integration rules using interpolation. In particular, we choose the composite Newton-Cotes quadratures and the function values at equally spaced sample points on the given interval as information. We compute the average case error of composite Newton-Cotes quadratures and show that it is minimal(modulo a multiplicative constant).

• Journal of the Korean Geotechnical Society
• /
• v.33 no.3
• /
• pp.5-15
• /
• 2017

In this study, the liquid and plastic limit tests were conducted on Paju clay with Casagarande method (dynamic) and the fall cone test method (static) to find out the effects of test methods and testers on their values. Six testers, who already have the experience of test, participated. As a results of liquid limit tests, the fall cone test method showed 4% smaller liquid limit compared to the value determined by Casagrande method. As the number of tests increased, the fall cone test method showed less variation between testers and the variation range of level of proficiency was also more stable. In the case of one point method, the liquid limit determined by the fall cone test method varied with smaller range compared to the Casagrande. Consequently, the fall cone test provided more stable liquid limit value than that of Casagrande method. For the results of plastic limit tests, there were no difference between Casagrande method and the fall cone test unlike liquid limit test results. In other words, both methods showed that plastic limit reached the average value as the number of tests increased, and the tendency level of proficiency also showed to get better.

• Journal of the Korean Applied Science and Technology
• /
• v.38 no.1
• /
• pp.228-240
• /
• 2021

This study was conducted with the goal of establishing a foothold for lifelong sports as well as establishing golf as a desirable leisure activity through the analysis of the relationship between golf participants' coach support, resilience and self-rated health. To achieve the goal of this study, a total of 300 questionnaires were distributed and 300 copies were collected back. Out of those returned questionnaires, insincerely replied or double-replied questionnaires were excluded and finally 278 questionnaires were analyzed for this study. For analysis of the data, frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, correlation analysis, and structural equating modeling were conducted using SPSS 18.0 and AMOS 18.0. Main findings were as follows: First coach support had a positive effect on resilience. Second, resilience had a positive effect on self-rated health. Third, coach support had a positive effect on self-rated health. Fourth, resilience mediated the relationship between golf participant coach support and self-rated health. Therefore, golf instructors should achieve specialization and diversification of educational programs through continuous learning about various teaching methods.

• Composites Research
• /
• v.26 no.4
• /
• pp.235-244
• /
• 2013

A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in an unbounded isotropic elastic solid containing multiple isotropic elliptical fibers of arbitrary orientation subject to uniform stress at infinity. The fibers are assumed to be long parallel elliptical cylinders composed of isotropic elastic material perfectly bonded to the isotropic matrix. The solid is assumed to be under plane strain on the plane normal to the cylinders. A detailed analysis of the stress field at the matrix-fiber interface for square and hexagonal packing of the fibers is carried out for different values of the number, orientation angles and concentration of the elliptical fibers. The accuracy and efficiency of the method are examined through comparison with results obtained from analytical and finite element methods.

• Journal of Ocean Engineering and Technology
• /
• v.9 no.1
• /
• pp.36-46
• /
• 1995

빙판파괴 형태는 여러 모드의 합성이며 실제로 한 가지 양식으로 파괴되는 경우는 거의 일어나지 않는다. 이제까지 빙하중 해석 이론이나 방법은 한 가지 양식에 기준하는 것이었다. 이 논문에서는 합성모드로 빙판이 파괴될 때 해양구조물에 작용하는 빙하중 추정방법을 소개하여 모형 실험결과치와 그 결과를 비교하였다. 두 가지 합성모드에 대한 빙하중 추정방법인 비례파괴해석법 (Proportional Failure Method)과 국부경계해석법(Local Ice boundary Method)을 본논문에 소개하였으며, 이 두가지 방법과 함께 널리 알려진 Crushing 해석방법을 적용하여 정적 및 동적 구조물에 작용하는 빙하중을 산출/비교하였다. 동적구조물은 쇄빙선을 이용하였고, 쇄빙선이 SPM 터미널에 monopod로 연결되어있는 형태를 선택하였다. 모형 실험은 Finland의 Wartsila 실험실에서 실시 하였고, 이 실험을 통하여 쇄빙선에 작용하는 빙력 및 시간별 쇄빙선의 동적 움직임을 측정하였다. 이 논문에서는 위에서 소개된 세가지 방법으로 계산된 빙하중과 실험측정결과를 비교하였고, 이론적으로 추정한 쇄빙선의 운동을 실혐결과치와 비교하였다. Crushing방법으로 산출한 빙하중은 실제치보다 상당히 높았고, 비례파괴해석법은 Crushing 방법보다 정확한 결과를 보여주었으며, 국부경계해석법은 상당히 모형실험측정치와 가까웠다. 물론 쇄빙선의 움직임도 빙하중에 따라 변화가 심했고, 국부 경계해석법을 적용했을 때 실제 쇄빙선의 동적움직임을 가장 가깝게 추정할 수 있었다.

• Composites Research
• /
• v.23 no.4
• /
• pp.7-13
• /
• 2010

A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in an unbounded isotropic elastic solids containing interacting multiple anisotropic inclusions subject to remote uniaxial tension. The method is applied to two-dimensional problems involving long parallel cylindrical inclusions. A detailed analysis of stress field at the interface between the matrix and the central inclusion is carried out for square and hexagonal packing of the inclusions. Effects of the number of anisotropic inclusions and various fiber volume fractions on the stress field at the interface between the matrix and the central inclusion are also investigated in detail. The accuracy of the method is validated by solving the single inclusion problem for which solutions are available in the literature.

• Journal of the Society of Disaster Information
• /
• v.10 no.1
• /
• pp.123-140
• /
• 2014

This paper proposes a simple and effective method for determining the dynamic characteristics of revolution shells. This is a weighted residual method in which the collocation points are taken at the roots of orthogonal polynomial. In this paper the collocation method is employed to replace a partical differential eqations by a system of ordinary differential equations in time, and the resulting equations are solved by two different numerical methods of time integration : an implicit method and an explicit method. The proposed approach is formulated in some detail. The versatility and accuracy are illustrated through several numerical examples. The method appears to be relatively easy to set up and gives satisfactory results.