• Smart Structures and Systems
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• 제17권6호
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• pp.957-980
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• 2016

Structural damage detection (SDD) is a challenging task in the field of structural health monitoring (SHM). As an exploring attempt to the SDD problem, a hybrid self-adaptive Firefly-Nelder-Mead (SA-FNM) algorithm is proposed for the SDD problem in this study. First of all, the basic principle of firefly algorithm (FA) is introduced. The Nelder-Mead (NM) algorithm is incorporated into FA for improving the local searching ability. A new strategy for exchanging the information in the firefly group is introduced into the SA-FNM for reducing the computation cost. A random walk strategy for the best firefly and a self-adaptive control strategy of three key parameters, such as light absorption, randomization parameter and critical distance, are proposed for preferably balancing the exploitation and exploration ability of the SA-FNM. The computing performance of the SA-FNM is evaluated and compared with the basic FA by three benchmark functions. Secondly, the SDD problem is mathematically converted into a constrained optimization problem, which is then hopefully solved by the SA-FNM algorithm. A multi-step method is proposed for finding the minimum fitness with a big probability. In order to assess the accuracy and the feasibility of the proposed method, a two-storey rigid frame structure without considering the finite element model (FEM) error and a steel beam with considering the model error are taken examples for numerical simulations. Finally, a series of experimental studies on damage detection of a steel beam with four damage patterns are performed in laboratory. The illustrated results show that the proposed method can accurately identify the structural damage. Some valuable conclusions are made and related issues are discussed as well.

• 디지털융복합연구
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• 제20권1호
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• pp.221-229
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• 2022

본 연구는 자기 결정성 이론에 근거한 의대생의 학업 동기 척도를 개발하고 타당화하고자 하였다. 이를 위해 74명을 대상으로 예비문항을 구성한 후, 예비조사와 본 조사는 각 148명과 300명을 대상으로 2020년 9월에서 11월까지 시행하였다. 자료 분석은 요인분석, 신뢰도 분석, 상관관계 분석을 이용하였다. 탐색적 요인분석과 확인적 요인분석결과, 구성 타당도가 검증되었다. 무동기, 외적 조절, 내사 조절, 동일시 조절, 내재적 동기의 5요인의 모형 적합도 지수는 양호하였다. 요인별 신뢰도는 0.760에서 0.933의 범위로 양호하였다. 학업 동기는 학업적 자기효능감과 학교생활만족도와 상관관계를 보여 준거 타당도가 검증되었다. 본 척도는 의대생의 학업 동기를 측정하는 타당하고 신뢰할 수 있는 도구로 확인되었으며, 추후 의대생의 학업 동기 관련 연구에 활용되기를 기대한다.

• 한국식품영양과학회지
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• 제43권6호
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• pp.916-925
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• 2014

본 연구에서는 45~60세 중년여성을 대상으로 인지된 건강관련 체력 수준에 따라 대상자를 분류하여 그룹 간에 식습관 및 생활습관을 비교하고, 식습관이 인지된 건강관련 체력수준에 미치는 영향을 알아보고자 하였다. 조사 대상자의 평균 나이는 48.5세로 인지된 건강관련 체력 수준이 '높음' 군의 제지방량이 유의적으로 더 많았다(P<0.05). 혈중지질성분 중에서는 중성지방만이 체력 수준에 따른 유의적인 차이를 보였는데, 인지된 건강관련 체력 수준이 '낮음' 군에서 유의적으로 더 높았다(P<0.05). 생활습관 특성을 분석한 결과 인지된 건강관련 체력 수준이 '높음' 군에서 활력 수준(P<0.001), 주관적인 건강상태(P<0.001), 정기적인 건강검진 여부(P<0.05), 규칙적인 운동 실천(P<0.05) 항목 모두 유의적으로 높았다. 평상시 식습관에 있어서도 인지된 건강관련 체력 수준이 '높음' 군의 식습관 평균 점수가 유의적으로 높았으며(P<0.05), 개별 항목에서도 '일정한 식사 시간(P<0.05)', '일정한 식사량(P<0.05)', '식사 시 즐거움(P<0.01)', '단백질 섭취 빈도(P<0.05)', '채소 섭취 빈도(P<0.01)', '식욕', '적정한 에너지 섭취(P<0.05)' 항목의 점수가 인지된 건강관련 체력 수준이 '높음' 군에서 유의적으로 높았다. 또한 식습관은 교란 인자를 보정한 회귀분석 결과에서도 인지된 건강관련 체력과 유의적인 양의 상관성(P<0.001)을 보였다. 이상의 결과로 평상시 바람직한 식습관이 인지된 건강관련 체력에 긍정적인 영향을 미칠 수 있으며, 중년 여성의 체력 향상을 위해 건강한 식습관의 실천이 필요할 것으로 보인다. 또한 이를 위해 중년 여성의 식생활에 관심을 갖고 올바른 식생활을 실천할 수 있도록 관련 프로그램과 교육의 기회가 마련되어야 할 것으로 사료된다. 본 연구에서 식습관이 인지된 건강관련 체력과 유의적인 관계가 있다는 결과는 그 자체로 의미가 있다고 생각되나 18개 식습관 문항의 평균점수를 독립변수로 처리하여 회귀분석 하였으므로 개별 식습관이 체력수준에 미치는 영향은 보지 못한 연구의 한계점이 있어 추후 분석이 더 요구된다.

• 유통과학연구
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• 제17권2호
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• pp.77-89
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• 2019

Purpose - This study presents the relationships between parent brand-self image congruence, parent brand -functional congruity, perceived fit between parent brand and extension product, and consumer's attitude toward extension product using the structural equation model. As for preceding concepts having a direct effect on consumer's attitude toward brand extension, the study focuses on parent brand-self image congruence and parent brand-functional congruity. It also looks at the effect of parent brand-self image congruence and parent brand-functional congruity on the consumer's attitude toward extension product and identifies if the perceived fit between parent brand and extension product is a concept playing a mediating role between parent brand-self image congruence or parent brand-functional congruity and consumer's attitude toward brand extension product. Research design, data, and Methodology - SPSS for Windows 18.0 and AMOS 18.0 were used for data analysis. Then, the Cronbach's α coefficient was obtained using SPSS for Windows 18.0 to measure reliability. In addition, the convergence and discriminative measures of the measured items were statistically verified using AMOS 18.0. Finally, we have validated a path model and a parameter model in which brand personality-self-matched attitude toward brand extension. Results - Studies have shown that the impact of parent brand-self image consistency and parent brand-functional consistency on the attitude of extended products was positive. Perceived fit between parent brand and extension products has been shown to play a role of intermediary between parent brand-self image congruence and consumer attitudes to extended products. However, perceived fit between parent brand and extension products did not play a role as intermediary between the parent brand-functional congruity and the attitude toward the extended product. Finally, in relation to the causal relationship between parent brand-congruity (self image/functionality) and attitudes to extended products. The effect of parent brand-functional coherency on attitudes toward extended products was found to be greater in groups with higher involvement than in those with lower involvement. Conclusions - Although few studies have been done on what variables mediated when parent brand-self image consistency and parent brand-functional coherency affect consumer attitude, this paper is significant in finding whether perceived fitness between the parent brand-congruity and the extension product is mediated.

• 한국응용과학기술학회지
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• 제38권4호
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• pp.941-950
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• 2021

본 연구는 학령기 비만아동의 생활습관, 식이자기효능감 및 운동자기효능감의 관계와 생활습관에 미치는 영향요인을 확인하기 위한 서술적 조사연구이다. 연구대상자는 G광역시에 소재하는 3개 초등학교의 비만아동 85명이었고 2019년 7월 20일부터 8월 2일까지 자료를 수집하였으며, 구조화된 설문지를 이용하여 조사하였다. 수집된 자료는 SPSS 27.0 프로그램을 이용하여 빈도와 백분율, ANOVA, t-test, Pearson's correlation coefficient, Multiple regression analysis로 분석하였다. 대상자의 생활습관에 미치는 영향요인을 확인하기 위하여 다중회귀분석한 결과, 식이자기효능감(𝛽=.406, p=.001)이 큰 영향을 미치는 변수로 나타났고, 운동자기효능감(𝛽=.245, p=.038)이 그 다음 순서로 나타났다. 또한 추정된 회귀모형의 적합도에 대한 F통계량은 6.34(p<.001)로 유의하였고, 설명력은 24.2%였다. 따라서 비만아동의 생활습관을 향상시키기 위해서는 식이자기효능감과 운동자기효능감을 높일 수 있는 방안을 모색해야 하며, 본 연구는 비만아동 생활습관 향상을 위한 프로그램을 개발하는데 기초자료로 활용될 것으로 사료된다.

• 간호행정학회지
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• 제12권1호
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• pp.23-31
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• 2006

Purpose: The purpose of this study was to test the empowerment structural model based on Kanter's work empowerment theory. Method: A predictive, nonexperimental design was used in a sample of 279 nurses from 3 university affiliated hospitals. Data were collected with self-administered questionnaires and analyzed using mean, standard deviation, pearson correlation coefficient and path analysis. Results: The results showed that the overall fitness of the hypothethical model to the data was good(chi-square=.7751, df=4, p=.942, GFI=.999, AGFI=.996, RMSEA=.000). Both formal power and informal power directly influenced on nurses' perceived empowerment level and empowerment directly influenced on nurses' organizational commitment and indirectly influenced on nurses' intent to stay. Conclusion: The results imply that hospital and nurse managers should provide the empowering working condition for nurses to be stayed in hospitals.

• Asia pacific journal of information systems
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• 제10권3호
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• pp.181-197
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• 2000

The purpose of this study is to confirm whether the fit between the task and the information characteristics makes any effects on the user satisfaction. The task is defined as two sub-constructs representing the degree of exception and analyzability. The information characteristics is divided into the degree of aggregation, scope and timeliness of information. User satisfaction was used as a surrogate measure of the performance of information systems. The computer self-efficacy was used to control any confounding effects. Field research method using questionnaires was employed to empirically investigate the relationship among the variables. Findings of the study are summarized as follows: the fit between the task and the aggregation of information and between the task and the scope of information turned out to have significant effects on information system performance. The implication of such results is that under highly exceptional or less analyzable task environment, less-aggregated or broad information is more appropriate.

• 한국간호교육학회지
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• 제5권2호
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• pp.219-231
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• 1999

Health is an important concept within the health component of nursing paradigm. And health concept is a core component to determine health behavior according to individual's health perception. Health habits during the period of university student will be affecting health behavior of the adult period. The purpose of this study was to analyze health concept of the university students in Korea and to provide the strategy of health care for the university students. The method of this research was a descriptive study using a self-report questionaire. The subjects were 301 students of university and their age was from 19 to 30. The results of this study were as follows: 1. Health concepts perceived by the university students were 'wholeness without difficulty', 'vitality', 'harmony', 'comfort', 'Good condition and fitness of physical and psychological condition', 'soundness', 'happiness', 'enabling' 'smoothness'. 2. Health was perceived by the subjects as an essential and an important component of life.

• 한국의류학회지
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• 제33권1호
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• pp.55-67
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• 2009

The purpose of this study is to develop well-being lifestyle measurement. Data were collected from a total of 251 Korean females ranging from 20 to 50 years old. The measurement items were developed by focus group interview to well-being consumers. Through a series of exploratory factor analysis and confirmatory factor analysis, the 7 sub-factors and 14 items that construct final measurement model of well-being lifestyle were identified: Health oriented eating habits, social welfare oriented consumption, interest in health policy, self-esteem enhancement, sports activity, volunteer for local community, use of cosmetics made of natural components. Fitness of measurement model and reliability and discriminant validity of measurement variables were accepted as a good level.

• 한국컴퓨터정보학회논문지
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• 제1권1호
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• pp.159-170
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• 1996

본 논문 에서는 진화 알고리즘과 퍼지 제어기를 이용하여 비선형 시스템을 위한 최적 규칙들을 자동으로 생성하는 방법을 제안한다. 진화 알고리즘에 의한 퍼지 논리 시스템의 최적 규칙은 전문가의 사전 경험이나 지식이 없이도 자동 설계가 가능하고 이들 규칙을 이용하석 지능 제어를 할수 있다. 본 논문에서 사용한 접근 방법은 최지 규칙 소속 함수의 자농 조정으로 규칙을 생성하고. 최적의 제어 규칙 탐색은 퍼지 논리 시스템의 성능 기준으로 정의한 적합도 값을 기반으로 탐색한다. 제안한 방법의 유용성을 보이기 위해 )fl선형 시스템에서 컴퓨터 모의실험을 행하였다.