• Title/Summary/Keyword: Physical model test

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A Study on the F.E. Model Updating and Optimization for Vehicle Subframe (차량 서브프레임의 유한요소 모델의 개선 및 최적화에 대한 연구)

  • 허덕재;이근수;홍석윤;박태원
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.220-227
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    • 2002
  • This paper describes an integrated approach process to carry out pre-test, model correlation and updating analysis on the sub-frame of a vehicle. In this study, it was found that the modal test could be more efficient when the exciting point was selected on the area with high driving point residue. Such area could be located with the aid of finite element modal analysis. The model correlation was appraised in conjunction with the modal parameters between modal test and finite elements analysis. Also, the finite element model updating was obtained the good resultant using the iteration method based on sensitivity analysis results that carried out the variation of natural frequencies and MAC for the material properties. Finally, optimization of vehicle subframe was carried out the analysis of core location and physical properties by tow steps.

A study of Experimental on Construction of Concrete Filled in Steel Tube Column under a Low Temperature (저온하에서의 CFT 시공을 위한 실험적 연구)

  • 강용학;이민경;정근호;백민수;김진호;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.489-494
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    • 2002
  • The basic Physical properties, Slump, Slump Flow, Air content, Bleeding, and Settlement of concrete was investigated to test Characteristic of Setting and to evaluate the relation between Model Specimen and Heat of Hydration for construction under Low Temperature (CFT). The objective of this study is to take the partial core after the cementation of Model Specimen, test the compression intensity and analyze the relation to Test Piece.

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An Experimental Study on the Construction of CFT Column Over the High Temperature (CFT 기둥의 서중 시공 적용을 위한 기초적 연구)

  • 이장환;강용학;공민호;정근호;김진호;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.1029-1034
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    • 2003
  • The basic Physical properties, Slump, Slump Flow, Air content, Bleeding, and Settlement of concrete was investigateed to test Characteristic of Setting and to evaluate the relation between Model Specimen and Heat of hydration for construction Over the High Temperature (CFT). The objective of this study is to take the partial core after the cementation of Model Specimen, test the compression intensity and analyze the relation to Test Piece.

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Effect of the Observation of an Audio-Visual Modeling on the Rehabilitation of Upper Limb Function in Stroke Patients (시청각적 모델링의 관찰이 뇌졸중 환자의 상지기능 재활에 미치는 영향)

  • Park, Sang-Bum;Kim, Mi-Hyun
    • Physical Therapy Korea
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    • v.14 no.2
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    • pp.1-10
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    • 2007
  • The purpose of this experiment was to investigate the applicability of audio-visual modeling for improving the efficiency of rehabilitative programs by analyzing the effects of observing these various models on the capacity of stroke patients to perform upper limb activities. Twenty-one stroke patients participated in the experiment and were randomly assigned to either task modeling, sport modeling, or control group. During 2 weeks of intervention, subjects in all groups participated in the physical practice of experimental tasks. These tasks comprised of a Nine Hole Peg Test, the Jebsen-Taylor Hand Function tests, and locomotion. These tasks were performed 5 days a week, 30 min per day. In addition to the physical practice, the task modeling group observed a model performing experimental tasks and locomotive activities for 20 min, while the sport modeling group observed a model performing various sport activities for 20 min. Subjects' ability to perform the experimental tasks was measured 3 times, before, immediately after, and 1 week after the intervention. Analyses of the capacity to perform upper extremity activities displayed significant improvement from the pre-test to immediate and delayed post-tests in all groups. However, the amount of improvement was the highest in the task modeling group. The task modeling group was superior to the control group in the post-test of all experimental tasks, whereas the sport modeling group did not display significant differences from the control group. These results suggest that audio-visual modeling can be used as an effective cognitive intervention for facilitating the rehabilitation of stroke patients, and its rehabilitative effect can be maximized when the program is comprised of performance scenes directly related to the target task.

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A Psychometric Item Goodness-of-Fit of the Test of Performance Strategies for Athletes with Physical Disabilities Applying Rasch Model (Rasch 모형을 적용한 지체장애 엘리트선수의 스포츠수행전략(TOPS) 척도 타당화)

  • Seo, Eunchul;Baek, Jae keun
    • 재활복지
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    • v.21 no.2
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    • pp.169-190
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    • 2017
  • The purpose of this study was to investigate item goodness-of-fit of Scale, Rasch rating scale model was applied to 5 dimensions 24 items of the Test of Performance Strategies (TOPS) in a sample of athletes with physical disabilities (n=215). An assumption to test Rasch Model, which is satisfaction of unidimensionality, is regarded through PCAR test, and WINSTEPS 3.65 program is used to test the goodness-of-fit of items. The results of this study were: First, 3-point rating category was appropriate for the TOPS instead of the existing 5-point rating category. Second, as a result of analyzing the goodness-of-fit of the items, 21 items of the TOPS were suitable, but 3 items were not. Third, the item reliability of person separation of the TOPS was acceptable, but the person reliability of item separation was not suitable and it was necessary to adjust the item order considering the difficulty level of the items. Fourth, as a result of comparing the individual attribute score and the difficulty level through the Item-Person Map, the distribution of the item difficulty distribution was shown to be biased in some factors compared to the personal attribute score distribution.

The Influence of Attractiveness and Match-Up of Model on Brand Attitude and Purchase Intention of Franchise Brands (프랜차이즈 브랜드에서 모델의 매력성 및 적합성이 브랜드 태도와 구매의도에 미치는 영향)

  • Ahn, Byung-Ok;Heo, Jeong-Moo;Lee, Dong-Han
    • The Korean Journal of Franchise Management
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    • v.8 no.4
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    • pp.7-19
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    • 2017
  • Purpose - The purpose of this study is to investigate the effect of model attractiveness on brand attitude and purchase intention, and examine whether product-model match-up plays a moderating role in the relationship between model attractiveness and brand attitude and purchase intention. The model attractiveness is consist of psychological and physical attractiveness of the model. The authors investigate how product-model match-up influence the strength of the relationship between model attractiveness - brand attitude and purchase intention. The purpose of this is to test whether product-model match-up influence the form and effectiveness of a model attractiveness on brand attitude and purchase intention and suggest the effective and efficient methods in the model selection strategies to increase advertising effectiveness based on the results of this study. Research design, data, and methodology - The experimental design for this study was the between subject design based on 2 group of the psychological attractiveness(high vs. low) × product-model match-up(high vs low) and 2 group of the physical attractiveness(high vs. low) × product-model match-up(high vs low). And a preliminary investigation was conducted to develop experimental stimuli through manipulation check to enhance the external validity of experimental research. The attractiveness of the model and product-model match-up are independent variables and manipulative variables in presentation of experimental stimuli. The self-administered methode experiment was conducted on 300 subjects in four groups constructed according to the independent variables. Result - The findings provide partial support for a moderator for product-model match-up on the model attractiveness - brand attitude and purchase intention. First, the influence of psychological attractiveness and physical attractiveness on brand attitude and purchase intention was shown significant. Also, it was found that the average value of brand attitude and purchase intention according to psychological attractiveness was significantly higher than the average value of brand attitude and purchase intention according to physical attractiveness in additional analysis. Second, the average value of brand attitude and purchase intention were higher when product - model match-up was high in both high and low psychological attractiveness and physical attractiveness of the model. However, in the case of psychological attractiveness, the correlation effect with product - model match-up was significant, but in the case of physical attractiveness, it was not significant. Conclusions - The results of this study suggest that the attractiveness factor should be considered in selecting the ad model by verifying the effect of the attractiveness of the model on the advertising effect. In particular, this study has great significance both academically and practically in terms of suggesting such implications that the advertising effect of psychological attractiveness and physical attractiveness may be different depending on the product type by additional analysis.

The Effect and Application of Flow Induction Machine in Artificial Canal Way and Lake through Water Quality Model Test (수질모형실험을 통한 인공수로와 호수에서 흐름유발시설 효과검증 및 적용방법에 관한 연구)

  • Choi, Gye-Woon;Kim, Dong-Eon;Yoon, Geun-Ho;Han, Man-Shin
    • Journal of Korea Water Resources Association
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    • v.44 no.6
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    • pp.477-486
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    • 2011
  • The objective of this study is to investigate the water pollution problems brought about by the construction of eco-friendly waterfront space through the physical model experiment including water quality consideration. Due to the lack of water supply into the artificial ponds and canals, the water quality problems such as eutrophication, odor and so on can be occurred. There have been many numerical models on such phenomena but limited studies using physical test due to the difficulty in the verification of physical interpretation of the study area. In this study, a prototype model that is not affected by the dimensionless parameters was carried out, where unpolluted water is mixed into the contaminated water to reduce the concentration of nutrients. In addition, this study also attempt to find the optimal configuration of the flow induction machines using the scale model which will evaluate and verify the effectiveness of the enforcement methods to maintain the water quality objectives.

A Prospective Model of Behavior of Physical and Occupational Therapists of The Confidentiality of Patient Medical records by Structural Equation Model (구조모형방정식을 이용한 물리치료사와 작업치료사의 환자의료정보 보호행동 예측모형 개발)

  • Lee, I.H.;Park, H.J.;Yun, K.I.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.4 no.1
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    • pp.71-80
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    • 2010
  • This study developed the perspective model of behavior of physical therapists(PTs) and occupational therapists(OTs) who are dealing with confidential patient medical information in hospitals. Theory of planned Behavior(TpB) model, expanded models 1 and 2 that add habit, social pressure, and work convenience concept to TpB are tested for the validity in explaining the preposing factors that affect the behavior of PTs and OTs in ensuring the confidentiality of patient medical records. Data were collected by administrating a survey to the 120 PTs and OTs in A city. Of the 120 questionaries distributed, 110 were responded resulting 91.6% of response rate. There were not significantly different among the group classified by age, 'clinical career, gender, work family, and education level were analysis using with Independent t test and one-way ANOVA. The relationships on the concepts suggested in the models were analysed by applying the Structured Equations Modeling methods. The results of Structured Equations analysis showed that expanded model 2 was more effective model than TpB model and expanded model 1.

Comparative Analysis of Body Composition and Basic Physical Strength between Model Majored Female College Students and General Female College Students (모델전공 여대생과 일반 여대생의 신체조성 및 기초체력 비교분석)

  • Kim, Won-Hyun;Kim, Seung-Suk
    • Journal of Digital Convergence
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    • v.12 no.10
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    • pp.597-604
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    • 2014
  • This research aimed at comparative analysis of body composition and basic physical strength of model majored female college students and general female college students. The research object was composed of 15 model majored female college students of D University, who learned the purpose of this research enough and wrote the consent form of voluntary participation and 15 general female college students, who have no medical history and currently no special disease, and no experience in regular exercise. They underwent body composition inspection, left right grasping power which is the basic physical strength, back muscle strength, flexibility, rapidity, muscle endurance, and the researcher performed descriptive statistics to calculate the average standard deviation, and analyzed to verify difference between groups by using independent t-test. With statistical significance level p<.05, the results are as follows. model majored female college students and general female college students showed meaningful difference between groups in weight, skeletal muscles, body fat volume, BMI and left right grasping power, back muscle strength, rapidity(p<.05). between groups in flexibility and muscle endurance(p>.05).

Characteristics Analysis of Highly Elastic Materials according to the Graphite Content and a Simulation Study of Physical Properties Prediction Using a Nonlinear Material Model (열팽창성 그래파이트 함량에 따른 고탄성 도료 소재의 특성 분석 및 비선형 재료모델을 활용한 물성 예측 시뮬레이션 연구)

  • Yu, Seong-Hun;Lee, Jong-Hyuk;Kim, Dae-cheol;Lee, Byung-Su;Sim, Jee-Hyun
    • Textile Coloration and Finishing
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    • v.34 no.4
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    • pp.250-260
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    • 2022
  • In this research, a high-elasticity acrylic emulsion binder with core-shell polymerization and self-crosslinking system is mixed with a flame-retardant water-dispersed polyurethane (PUD) binder. In addition, finite element analysis was conducted through virtual engineering software ANSYS by applying three representative nonlinear material models. The most suitable nonlinear material model was selected after the relative comparison between the actual experimental values and the predicted values of the properties derived from simulations. The selected nonlinear material model is intended to be used as a nonlinear material model for computational simulation analysis that simulates the experimental environment of the vibration test (ASTM E1399) and the actual fire safety test (ASTM E1966). When the mass fraction of thermally expandable graphite was 0.7%, the thermal and physical properties were the best. Among the nonlinear material models, the simulation result of the Ogden model showed the closest value to the actual result.