• 한국엔터테인먼트산업학회논문지
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• 제13권1호
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• pp.185-197
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• 2019

본 연구는 유아교육과 신입생의 학업흥미관련 변인 탐색을 하고자 하였다. 이를 위해 학업적 자기효능감, 성격강점, 학업동기와의 관계를 알아보았다. 연구대상은 대구 지역 K전문대학 유아교육과 신입생 144명이다. 연구를 위해서 학업적 자기효능감, VIA-IS 성격강점 단축형 검사, 학업동기 설문지를 사용하여 검사를 하였다. 수집된 자료는 SPSS 18.0프로그램을 사용하여, 빈도분석, 기술통계, 상관분석, 단계적 중 다회귀분석을 실시하였다. 본 연구의 주요 결과는 다음과 같다. 첫째, 유아교육과 신입생의 학업적 자기효능감, 성격강점, 학업동기 변인 모두 보통수준으로 나타났다. 둘째, 유아교육과 신입생의 학업적 자기효능감과 성격강점, 학업적 자기효능감과 학업동기, 성격강점과 학업동기 모두 유의미하게 정적인 상관관계가 있었다. 셋째, 유아교육과 신입생의 학업적 자기효능감과 성격강점이 학업동기에 미치는 상대적 영향력을 알아본 결과 주로 학업적 자기효능감의 하위변인 중 자기조절 효능감이 주로 통계적으로 유의미한 영향을 미쳤고, 성격강점의 하위변인 중 용기가 주로 통계적으로 유의미한 영향을 미치는 것으로 나타났다.

• 대한치과교정학회지
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• 제35권6호
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• pp.433-442
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• 2005

본 연구의 목적은 브라켓 접착 시 산부식과 전처리 과정을 결합하여 접착 단계를 단순화시킨 self-etching primer (SEP)를 차용하는 경우 접착제 종류와 타액의 존재 유무에 따른 전단결합강도의 차이에 관하여 비교 연구 하는 것이다. 소의 하악 영구 전치를 포매하여 만든 시편을 접착제의 종류에 따라 레진 접착제와 레진 강화형 글래스 아이오노머 접착제를 이용한 군으로 나누었고 각각 37% 인산으로 산부식 후 기존의 본딩용 프라이머를 사용하여 접착한 군과, SEP를 사용하여 접착한 군으로 분류하고, 타액 오염 유무에 따라 다시 각 군을 분류하여 전단결합 강도를 측정하였다. 그 결과 레진 접착제로 브라켓을 부착한 경우 SEP를 사용하여 접착한 군의 전단결합강도는 인산 처리군에 비해 낮은데 비해 레진 강화형 글래스 아이오노머를 사용한 경우, 전처리법에 따른 전단결합강도는 통계적으로 유의한 차가 없었으며, 접착제의 종류에 관계없이 타액 오염이 존재 시에는 SEP를 사용한 군이 인산처리군에 비해 높은 전단결합강도를 보였다. 이상의 결과에서 SEP를 사용 시 레진 접착제와 레진 강화형 글래스 아이오노머 접착제 모두 임상적으로 사용 가능한 전단결합강도를 보였으며, 특히 타액에 오염된 치면에서도 SEP를 사용하여 브라켓을 접착하는 것은 적절한 결합강도를 얻을 수 있으므로 임상적으로 유용할 것으로 생각된다.

• 대한간호학회지
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• 제36권3호
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• pp.484-492
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• 2006

Purpose: The purpose of this study was to investigate the effects of a rehabilitation nursing program(RNP) for persons with disabilities. Method: a quasi-experimental pretest and post test study was used to examine the changes of patient's muscle strength, flexibility, self efficacy and health related quality of life at the completion of an 8-week education and physical exercise with a Thera-Band and Exercise Ball course. The subjects consisted of 40 adults who were disabled. Twenty-two experimental and 18 control subjects completed pre and post-test measures. Outcome variables were flexibility, hand grip, elbow flexor and extensor, knee flexor and extensor, self efficacy and quality of life. Independent t-test and ANCOVA were used to examine group differences by using SPSS 12.0 Result: Mean comparisons of the change scores revealed that the experimental group increased significantly in knee extremity flexor(p=0.035), extensor(p=0.039), flexibility(p=0.008), self efficacy(p=0.000), and quality of life(p=0.000). No significant group differences were found in each patient's hand grip, elbow flexor and extensor. Conclusion: RNP can improve lower extremity flexibility, muscle strength, self efficacy and health related quality of life in people with disabilities. The intervention to tailor exercise and education to the unique needs of the disability was suggested for further study.

• International Journal of Concrete Structures and Materials
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• 제9권1호
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• pp.69-88
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• 2015

Self-consolidating concrete (SCC) is a stable and cohesive high consistency concrete mix with enhanced filling ability properties that reduce the need for mechanical compaction. Limited standards and specifications have been reported in the literature on the structural behavior of reinforced self-compacting concrete elements. The significance of the research presented in this paper stems from the need to investigate the effect of enhanced fluidity of SCC on the structural behavior of high strength self-consolidating reinforced concrete beams. To meet the objectives of this research, twelve reinforced concrete beams were prepared with two different generations of superplasticizers and designed to exhibit flexure, shear, or bond splitting failure. The compared beams were identical except for the type of superplasticizer being used (second generation sulphonated-based superplasticizer or third generation polycarboxylate-based superplasticizer). The outcomes of the experimental work revealed comparable resistance of beam specimens made with self-compacting (SCC) and conventional vibrated concrete (VC). The dissimilarities in the experimental values between the SCC and the control VC beams were not major, leading to the conclusion that the high flowability of SCC has little effect on the flexural, shear and bond strengths of concrete members.

• Computers and Concrete
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• 제12권3호
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• pp.285-301
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• 2013

This paper concentrates on the results of experimental work on tensile strength of self-compacting concrete (SCC) caused by flexure, which is called rupture modulus. The work focused on concrete mixes having water/binder ratios of 0.35 and 0.45, which contained constant total binder contents of 500 $kg/m^3$ and 400 $kg/m^3$, respectively. The concrete mixes had four different dosages of a superplasticizer based on polycarboxylic with and without silica fume. The percentage of silica fume that replaced cement in this research was 10%. Based upon the experimental results, the existing equations for anticipating the rupture modulus of SCC according to its compressive strength were not exact enough. Therefore, it is decided to use artificial neural networks (ANN) for anticipating the rupture modulus of SCC from its compressive strength and workability. The conclusion was that the multi layer perceptron (MLP) networks could predict the tensile strength in all conditions, but radial basis (RB) networks were not exact enough in some circumstances. On the other hand, RB networks were more users friendly and they converged to the final networks quicker.

• 대한물리의학회지
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• 제5권4호
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• pp.569-576
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• 2010

Purpose : This study was aimed at determining the effects of community-based exercise program to improve leg muscle strength and balance for elderly women. Methods : This study was nonequivalent control group pre-post test design. Subjects were assigned to two different groups(exercise group=11, control group=7). Exercise group performed community-based exercise program for 8 weeks. Outcome measures included leg muscle strength, balance, walking velocity, activities of daily living(ADL), exercise self-efficacy and health-related quality of life(QoL). The collected data analyzed by independent t-test and paired t-test. Results : Leg muscle strength, walking velocity and mental component summary(QoL) were significantly improved in the exercise group. But balance and exercise self-efficacy were significantly worsened in the control group. There were no significant difference between groups after 8 weeks of community-based exercise. Conclusion : These results suggested that the community-based exercise program is effective for elderly women in improving leg muscle strength, walking velocity and mental component summary(QoL).

• 수산해양교육연구
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• 제26권1호
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• pp.59-71
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• 2014

The purpose of this study was two folded. The first was to examine relationships among children's self-resilience, their mother's parenting style, family strength and the children's school adjustment and the second was to investigate the relative effects of the three variables on the children's school adjustment. To achieve the purposes, a total of 198 5th and 6th grade children and their mothers were surveyed on children's resilience scale, parenting style scale, family strength scale, and school adjustment scale. As a results, positive relationships among the four variables were observed. Also it was founded that children's self-resilience is the most effective, mothers' parenting style is the second, and family strength is the least factor on school adjustment. From the results the researchers suggested that early intervention is needed to enhance family strength as well as intervention to improve self-resilience in order to increase the children's school adjustment.

• Computers and Concrete
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• 제24권2호
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• pp.137-150
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• 2019

In this paper, surrogate models such as multivariate adaptive regression splines (MARS) and M5P model tree (M5P MT) methods have been investigated in order to propose a new formulation for the 28-days compressive strength of self-compacting concrete (SCC) incorporating metakaolin as a supplementary cementitious materials. A database comprising experimental data has been assembled from several published papers in the literature and the data have been used for training and testing. In particular, the data are arranged in a format of seven input parameters covering contents of cement, coarse aggregate to fine aggregate ratio, water, metakaolin, super plasticizer, largest maximum size and binder as well as one output parameter, which is the 28-days compressive strength. The efficiency of the proposed techniques has been demonstrated by means of certain statistical criteria. The findings have been compared to experimental results and their comparisons shows that the MARS and M5P MT approaches predict the compressive strength of SCC incorporating metakaolin with great precision. The performed sensitivity analysis to assign effective parameters on 28-days compressive strength indicates that cementitious binder content is the most effective variable in the mixture.

• Computers and Concrete
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• 제23권6호
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• pp.409-419
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• 2019

In the present study, effect of size and placement of cubic specimens on compressive strength of self-compacting lightweight concrete (SCLC) were considered. To do so, 81 specimens of different sizes (50 mm, 75 mm, 100 mm, and 150 mm) were prepared by using three different mixes of SCLC. Results of the cured specimens were then used in regression analyses to find predictive equations with regard to both the placement direction and the size. Test results showed that the strength ratio in cases in which the direction of loading and placement were parallel, were higher than those specimens, whose configurations were normal between loading and placement. In addition, strength ratios in SCLC mixes were slightly higher than those are for self-compacting normal weight concrete. In order to analyze the effect of size on compressive strength the conventional size effect law as well as the modified size effect law (MSEL) were used. Besides, the convergence criterion of nonlinear regression process of size effect study has been discussed. Analyses of the results showed that the unconstraint nonlinear regression in size effect study of SCLC mixes could lead to erroneous results.

• Structural Engineering and Mechanics
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• 제86권2호
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• pp.181-195
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• 2023

To predict the rheological behaviours along with the compressive strength of self-compacting concrete that incorporates environmentally friendly ingredients as cement substitutes, a comparative evaluation of machine learning methods is conducted. To model four parameters, slump flow diameter, L-box ratio, V-funnel time, as well as compressive strength at 28 days-a complete mix design dataset from available pieces of literature is gathered and used to construct the suggested machine learning standards, SVM, MARS, and Mp5-MT. Six input variables-the amount of binder, the percentage of SCMs, the proportion of water to the binder, the amount of fine and coarse aggregates, and the amount of superplasticizer are grouped in a particular pattern. For optimizing the hyper-parameters of the MARS model with the lowest possible prediction error, a gravitational search algorithm (GSA) is required. In terms of the correlation coefficient for modelling slump flow diameter, L-box ratio, V-funnel duration, and compressive strength, the prediction results showed that MARS combined with GSA could improve the accuracy of the solo MARS model with 1.35%, 11.1%, 2.3%, as well as 1.07%. By contrast, Mp5-MT often demonstrates greater identification capability and more accurate prediction in comparison to MARS-GSA, and it may be regarded as an efficient approach to forecasting the rheological behaviors and compressive strength of SCC in infrastructure practice.