• 한국콘텐츠학회논문지
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• 제16권10호
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• pp.382-392
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• 2016

본 연구는 복합적 구조의 자기주도학습 과정을 구성하고, 이를 토대로 대학생들을 위한 복합적 구조의 자기주도학습 측정 도구를 개발하는 것을 목적으로 하였다. 연구 목적을 달성하기 위해 문헌 분석 및 선행 연구 검토를 통해서 동기와 학습실행 행동(학습목표 설정, 학습 계획 수립, 학습 활동, 학습결과 평가 행동)과 학습관리 행동(자기관찰, 자기검토, 자기수정)이 복합적으로 구성된 자기주도학습 모형을 구성하였다. 이를 토대로 19개의 하위요인을 구성하였고, 114개 측정 문항을 개발하였다. 먼저 예비 척도를 개발하여 수도권의 D대학 학생 128명을 대상으로 신뢰도 검증을 수행하였다. 그 결과 모든 하위 요인의 신뢰도가 양호한 것으로 나타나 제외된 문항 없이 본 척도를 개발하였다. 본 척도의 타당성을 검증하기 위해 수도권의 D대학 학생 674명을 대상으로 신뢰도와 구인타당도를 검증하였다. 신뢰도는 목표행동 (.834), 목표관찰(.809), 목표검토(.839), 목표수정(.773), 계획행동(.765), 계획관찰(.861), 계획검토(.890), 계획수정(.810), 학습전략(.784), 학습관리(.775), 학습유지(.809), 자원획득(.828), 학습관찰(.846), 학습검토(.827), 학습수정(.830), 평가행동(.892), 평가관찰(.866), 평가검토(.891), 평가수정(.868)로서 모든 하위 요인이 양호한 것으로 나타났다. 구인타당도 검증을 위해 확인적 요인분석을 실시한 결과 최초 모형은 적합한 것으로 나타나지 않았다. 이에 모형 수정지수를 고려하여 1차 수정한 결과 ${\chi}^2$(563.254), CFI=.963, NFI=.951, RMSEA=.064로 나타나 모형이 타당한 것으로 검증되었다.

• 한국간호교육학회지
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• 제21권1호
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• pp.5-15
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• 2015

Purpose: This study, on the basis of a structural model that includes nurse image, image determinants, and self-esteem of Cambodian nursing students influenced by the Korean nursing education system, demonstrates distinctions between senior and junior according to experience in clinical practice. Methods: Data were collected via a questionnaire from 194 nursing students in Cambodia and subsequently analyzed using the STATA IC 12 program. Results: First, image determinants and their sub-factors-subjective, institutional, and media-effect both the nurse image and self-esteem of nursing students. Second, the study confirms that nurse image has no significant effect on self-esteem. Also, the individual factor, a sub-factor of nurse image, possesses a weak relationship with nurse image. Third, the structural model mediating between senior and junior reveals differences resulting from experiences derived from clinical practice. Conclusion: The study has significance in that Cambodian nursing students, who are rarely studied in terms of nurse image, have been systemically analyzed via a structural model incorporating image determinants and self-esteem.

• 대한토목학회논문집
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• 제30권3B호
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• pp.233-242
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• 2010

Bastiaanssen(1995)에 의해 개발된 SEBAL(Surface Energy Balance Algorithm for Land) 모형은 25개의 sub model들을 이용하여 지표의 증발산량과 기타 여러 에너지 교환을 계산하는 이미지-프로세싱 모형이다. SEBAL 모형은 Landsat 또는 기타 여러 위성영상을 통해 얻을 수 있는 열적외선 방사, 표시 및 근적외선 측정 자료 등을 사용한다. 본 연구에서는 한강유역의 주 지류인 경안천 유역에 모형을 적용시켰다. 증발산량(ET)은 4개년의(2001년-2004년) Landsat과 MODIS 위성영상을 입력자료로 사용하여, 에너지 균형원리를 통해 pixel-by-pixel을 기준으로 계산되었다. Landsat(30 m)과 MODIS(1 km) 사이의 비교 결과도 평가되었으며, Landsat과 MODIS 결과들은 FAO Penman-Monteith 증발산량과 비교하였다. 위성영상 ET들과 FAO Penman-Monteith ET 간의 절대 오차는 12% 이내로 확인되었으며, 유역 분포 증발산량의 시공간분포특성 또한 분석하였다.

• 공학교육연구
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• 제27권2호
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• pp.35-50
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• 2024

The purpose of this study is to identify the core competencies of graduate students at A research university in the context of graduate education in science and engineering, and to develop and validate a diagnostic tool to measure them. To achieve the research objectives, first, 6 factors and 18 sub-competencies of core competencies were derived based on a review of domestic and foreign studies, cases of excellent research-centered overseas universities, and interviews with members of A University. Second, a theoretical model was constructed by deriving behavioral indicators based on the core competencies and sub-competencies, and a preliminary survey was conducted on 188 graduate students of University A to verify the statistical validity of the theoretical model. Results of exploratory and confirmatory factor analysis, the core competencies of graduate students at A research university consisted of 6 factors, 16 sub-competencies, and 77 items. Specifically, it included "Independent research capability(13 items)", "Social Entrepreneurship(10 items)", "Academic agility(15 items)", "Ingenious Challenges(15 items)", "Collegial Collaboration(9 items)", and "Mueunjae leadership(15 items)". This study contributes to the development of theories related to core competencies of graduate students in science and engineering, and has practical significance as a basis for a data-driven competency-based graduate education system.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2006년도 추계 종합학술대회 논문집
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• pp.413-416
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• 2006

본 연구에서는 효과적인 토양보존 및 관리에 필요한 전략적 접근 방법을 제시하였다. 이를 위해 탁수발생이 뚜렷이 구분되는 안동호와 임하호 유역을 선정하였으며, 탁수발생 원인인 토사유실을 평가하기 위해 RUSLE 토사유실모델을 이용하였다. 토사유실 가능성이 높은 지역들은 GIS에 의한 지형특성을 기초로 분석되어질 수 있으며, 특히 상하류 유역이나 인간의 활동영역인 하천주변 특성들을 이용하여 검토할 수 있다. 본 연구에서 제안된 모델링 결과는 토양보존 및 관리를 위해 검토되어지는 토사유실 원인지역을 선정하기 위한 가이드라인으로 활용될 수 있다. 또한 이러한 접근방법은 상대적으로 간편하며, 실질적으로 널리 활용될 수 있다.

• Asian Journal of Atmospheric Environment
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• 제10권2호
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• pp.67-79
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• 2016

The forecasting of air pollution is an important and popular topic in environmental engineering. Due to health impacts caused by unacceptable particulate matter (PM) levels, it has become one of the greatest concerns in metropolitan cities like Karaj City in Iran. In this study, the concentration of $PM_{2.5}$ was predicted by applying a multilayer percepteron (MLP) neural network, a radial basis function (RBF) neural network and a Markov chain model. Two months of hourly data including temperature, NO, $NO_2$, $NO_x$, CO, $SO_2$ and $PM_{10}$ were used as inputs to the artificial neural networks. From 1,488 data, 1,300 of data was used to train the models and the rest of the data were applied to test the models. The results of using artificial neural networks indicated that the models performed well in predicting $PM_{2.5}$ concentrations. The application of a Markov chain described the probable occurrences of unhealthy hours. The MLP neural network with two hidden layers including 19 neurons in the first layer and 16 neurons in the second layer provided the best results. The coefficient of determination ($R^2$), Index of Agreement (IA) and Efficiency (E) between the observed and the predicted data using an MLP neural network were 0.92, 0.93 and 0.981, respectively. In the MLP neural network, the MBE was 0.0546 which indicates the adequacy of the model. In the RBF neural network, increasing the number of neurons to 1,488 caused the RMSE to decline from 7.88 to 0.00 and caused $R^2$ to reach 0.93. In the Markov chain model the absolute error was 0.014 which indicated an acceptable accuracy and precision. We concluded the probability of occurrence state duration and transition of $PM_{2.5}$ pollution is predictable using a Markov chain method.

• 한국시뮬레이션학회논문지
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• 제25권3호
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• pp.1-14
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• 2016

본 논문은 사물 무선 서브 망을 모바일 망과 인터넷을 차례로 연계하는 무선 게이트웨이 처리 방식을 중심으로 데이터 유실이 있는 전송 방법과 데이터 무손실 전송 방법으로 구분하여 각 방법에 대한 일반적 전송 방식들을 두 가지 씩 4가지 타입을 제안하고, 각 타입의 일반적 처리 절차를 상태천이모델(Sate Transition Model)을 이용하여 설계한다. 도출된 각 상태천이도를 기반으로 각 타입들의 기능들을 실제로 구현하고 테스트함으로써 이들 방식들의 성능을 평가한다. 평가 결과로서, 다른 타입들과 비교해 볼 때, 여러 대기 상태들에서 데이터 혹은 응답 수신을 위해 저전력 Sleep모드-인터럽트와 폴링을 조합한 타입이 폴링만 사용하거나 Sleep모드-인터럽트만을 사용하는 방법보다 데이터 전송 실시간성, 데이터 유실도, 에너지 소모 등에서 가장 좋은 성능을 보인다.

• Journal of Preventive Medicine and Public Health
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• 제42권3호
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• pp.151-159
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• 2009

Objectives : This study was to determine how the perception and the satisfaction of outpatients who utilized clinics and hospitals are structurally related with their willingness to utilize the same institution in the future. Methods : Three hundred and ten responses (via convenient sampling) were collected from 5 hospitals and 20 clinics located in Seoul listed in the "Korea National Hospital Directory 2005". Service quality was utilized as the satisfaction measurement tool. For analysis, we used a structural equation modeling method. Results : The determining factors for general satisfaction with medical services are as follows: medical staff, reasonability of payment, comfort and accessibility. Such results may involve increased competition in the medical market and increased demands for quality medical services, which drive the patients to visit hospitals on their own on the basis of changed determining factors for satisfaction. Conclusions : The structural equation model showed that the satisfaction of outpatients with the quality of medical services is influenced by a few sub-dimensional satisfaction factors. Among these sub-dimensional satisfaction factors, the satisfaction with medical staff and payment were determined to exert a significant effect on overall satisfaction with the quality of medical services. The structural relationship in which overall satisfaction perceived by patients significantly influences their willingness to use the same institution in the future was also verified.

• The Journal of Asian Finance, Economics and Business
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• 제9권8호
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• pp.89-97
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• 2022

The e-commerce market faces significant credit risks due to the complexity of the industry and information asymmetries. Therefore, credit risk has started to stymie the growth of e-commerce. However, there is no reliable system for evaluating the creditworthiness of e-commerce companies. Therefore, this paper constructs a credit risk evaluation index system that comprehensively considers the online and offline behavior of online retail enterprises, including 15 indicators that reflect online credit risk and 15 indicators that reflect offline credit risk. This paper establishes an integration method based on a fuzzy integral support vector machine, which takes the factor analysis results of the credit risk evaluation index system of online retail enterprises as the input and the credit risk evaluation results of online retail enterprises as the output. The classification results of each sub-classifier and the importance of each sub-classifier decision to the final decision have been taken into account in this method. Select the sample data of 1500 online retail loan customers from a bank to test the model. The empirical results demonstrate that the proposed method outperforms a single SVM and traditional SVMs aggregation technique via majority voting in terms of classification accuracy, which provides a basis for banks to establish a reliable evaluation system.

• 한국항공운항학회지
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• 제31권1호
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• pp.118-132
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• 2023

This study aimed to analyze the relationship between the learning perception of aviation service subjects using role play on the interpersonal competence, learning satisfaction, and learning outcomes of college students majoring in aviation service. A survey was conducted targeting 217 university students majoring in aviation service who are enrolled in universities in the metropolitan area and Chungcheong area and have experience in class using role play. In addition, the hypothesis is verified using the structural equation model. Among the perceptions of role play classes experienced by university students majoring in aviation service, 'inter-dependency' was found to have a positive (+) effect on all sub-factors of interpersonal competence. And 'usefulness' confirmed the positive (+) influence relationship with 'temperament for others' and 'communication' except for 'relationship promotion' of interpersonal ability. Among sub-factor of interpersonal competence, it is confirmed that only the factors of 'temperament for others' and 'communication' had an effect on learning satisfaction. And it is proved that learning satisfaction is an important determinant of learning outcomes. Therefore, this study is expected to serve as a basis for deriving an efficient and optimal learning method for practical subjects in aviation service majors.