• Structural Engineering and Mechanics
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• 제83권3호
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• pp.293-304
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• 2022

In this work, a novel reliability approach for combined high and low cycle fatigue (CCF) estimation is developed by combining active learning strategy with least squares support vector machines (LS-SVM) (named as ALS-SVM) surrogate model to address the multi-resources uncertainties, including working loads, material properties and model itself. Initially, a new active learner function combining LS-SVM approach with Monte Carlo simulation (MCS) is presented to improve computational efficiency with fewer calls to the performance function. To consider the uncertainty of surrogate model at candidate sample points, the learning function employs k-fold cross validation method and introduces the predicted variance to sequentially select sampling. Following that, low cycle fatigue (LCF) loads and high cycle fatigue (HCF) loads are firstly estimated based on the training samples extracted from finite element (FE) simulations, and their simulated responses together with the sample points of model parameters in Coffin-Manson formula are selected as the MC samples to establish ALS-SVM model. In this analysis, the MC samples are substituted to predict the CCF reliability of turbine blades by using the built ALS-SVM model. Through the comparison of the two approaches, it is indicated that the reliability model by linear cumulative damage rule provides a non-conservative result compared with that by the proposed one. In addition, the results demonstrate that ALS-SVM is an effective analysis method holding high computational efficiency with small training samples to gain accurate fatigue reliability.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.610-613
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• 2003

건설산업의 국제경쟁력 강화를 위해서는 기술력의 확보가 무엇보다 중요하다. 기술력은 유능한 엔지니어의 양성과정에서부터 시작됨의 인식으로 대학교육의 중요성이 대두되고 있는 현실이다. 본 연구에서는 수동적 교육의 한계를 극복하기 위하여 능동적 학습방식의 의의 및 중요성을 제시하고자 한다. 사례로서 중량의 양중작업용 타인크레인을 대상으로 능동적 학습 절차와 주요 수행 내용을 설명하고 학습효과를 분석한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5496-5521
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• 2018

Object detection and tracking is the basic capability of mobile robots to achieve natural human-robot interaction. In this paper, an object tracking system of mobile robot is designed and validated using improved multiple instance learning algorithm. The improved multiple instance learning algorithm which prevents model drift significantly. Secondly, in order to improve the capability of classifiers, an active sample selection strategy is proposed by optimizing a bag Fisher information function instead of the bag likelihood function, which dynamically chooses most discriminative samples for classifier training. Furthermore, we integrate the co-training criterion into algorithm to update the appearance model accurately and avoid error accumulation. Finally, we evaluate our system on challenging sequences and an indoor environment in a laboratory. And the experiment results demonstrate that the proposed methods can stably and robustly track moving object.

• Journal of Information Technology Applications and Management
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• 제29권1호
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• pp.29-45
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• 2022

The Fourth Industrial Revolution era requires people to have the ability of integrated thinking, critics, sensitivity, and creativity in an integrated manner. Therefore, teaching methods are expected to become more suitable for the trend. In this belief, current teacher-leading education method should move to students' self motivating one and consist of programs in which students voluntarily involve. In this reason, this study suggests FPBL educational method model that is combines project-based learning with flipped learning by analysing preceding research and digital painting tool class was designed by applying it. As a result of applying the designed class model to the class, all of the class satisfaction, effectiveness, and interaction were evaluated positively. Problems such as limitations of project classes due to non-face-to-face classes, large amount of learning before class, and reduced concentration during class were found. Therefore, when the FPBL class model is conducted non-face-to-face, it will be necessary to further strengthen the role of the instructor, provide lecture videos summarizing the core contents, and improve concentration by providing active participation and fun using various digital tools. The result of the study looks significant by confirming the possibility of applying FPBL model not only in design education but also other educational settings.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제27권4호
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• pp.407-428
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• 2013

본 연구는 공과대학생들의 수학 학습 능력 향상을 위한 효과적인 교수-학습 모형을 개발하고 활용 방안을 제안하는데 그 목적이 있다. 이를 위해, 교수-학습과정에서 중요한 변인으로 작용하는 학생들의 학습양식과 수학학습태도를 조사하여 둘 사이의 연관성을 분석하였다. 그 결과, 연구대상자들은 의존적이고 참여적인 성향이 강한 것으로 파악되었기 때문에, 이런 성향의 학습자들이 능동적이고 적극적으로 참여할 수 있는 교수-학습 모형을 개발하기 위해 노력하였다. 개발된 교수-학습 모형을 한 학기 공업수학 강좌에 적용한 후 학생들의 반응을 조사한 결과, 이 모형은 공과대학생들이 메타인지적으로 자기 학습과정을 진단하고 조정하는 능력을 향상시켜 자기주도적으로 학습하는데 도움이 될 수 있다는 것을 확인하였다. 또한, 학생들이 수업에 적극적으로 참여하고 수학 학습에 긍정적인 태도를 갖게 하는데도 영향을 미치는 것을 확인하였다.

• 공학교육연구
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• 제22권1호
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• pp.22-28
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• 2019

The purpose of this study is to develop instructional design model of flipped learning suitable for engineering education field and to draw out effects and improvements by applying it to actual lessons for engineering college students. Literature review and case studies were conducted to achieve the purpose of the study. For a case study, flipped learning was applied to 'creative problem solving methodology' which is a liberal arts course of engineering college at D university in Gyeonggi-do. As a result of the literature review, the PARTNER model was applied and weekly instructional guide was presented by each stage. In addition, the results of analysis on the reflection journal showed that the students were more able to achieve the deepening learning stage through active participation in class than the existing class, and found that they had a more challenging plan after the class.

• 한국콘텐츠학회논문지
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• 제19권1호
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• pp.37-46
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• 2019

본 연구의 목적은 직업 교육훈련을 위한 플립러닝 기반 교육모델을 개발하는 데 있다. 이를 위하여 선행 연구를 토대로 해당 직종에서의 플립러닝의 정의, 단계별 주요 학습활동, 운영 전략을 포함하는 교육모델을 도출하였다. 또한 HRD 및 직업교육훈련 전문가를 대상으로 적용 모델에 대한 타당도를 확보하기 위하여 2차례에 걸쳐 델파이 조사를 실시하였으며 유효성이 확인되었다. 최종적으로 개발된 직업교육훈련을 위한 플립러닝 교육모델은 사전학습-본학습-사후학습의 3단계로 구성되며, 사전학습 단계는 온라인 강의 수강-간단한 과제 수행, 본 학습 단계는 도입활동-능동적 학습활동 및 코칭-디브리핑 강의, 사후학습 단계는 개별 성찰-추가과제 수행 활동을 포함한다. 본 연구를 통해 개발한 교육모델은 직업교육훈련의 목표에 따라 유연하게 확장가능하며, 연계성과 훈련성과 향상에 초점을 두고 개발되었다.

• 동의신경정신과학회지
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• 제12궈1호
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• pp.123-135
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• 2001

Objective: This study was designed to assess antidepressant effects of Quibitang on an Animal Model of Depression induced by Chronic Mild Stress. Method: The consumption of 1% sucrose solution and active avoidance learning test were used to evaluate antidepressant effect of Quibitang. The consumption of 1% sucrose solution was measured every week for 8 weeks, and active avoidance learning test was executed after 4 weeks treatment of saline or Quibitang. Result: 1. The consumption of 1% sucrose solution was significantly reversed in test group (Quibitang-treated group) at 5th, 7th, 8th weeks, but there was no significant change in control group. 2. Chronic Mild Stress was found to suppress the increase of body weight at 5th, 6th, 7th, 8th weeks. Treatment of Quibitang did not enhanced the body weigt, but it enhanced the consumption of sucrose solution. 3. In order to measure the learning ability of rat which drived to be depressed, we executed active avoidance test. The result revealed that depressed rat showed impaired acquisition than control group, and the treatment of Quibitang restored the learning activity. Conclusion: These results suggest that Quibitang may have antidepressant effects on depression induced by chronic mild stress.

• 한국병원경영학회지
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• 제20권2호
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• pp.1-14
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• 2015

Purpose : The aim of this article is to describe the nurses' experiential learning mechanism on patient safety. Methods : To analyze nurses' learning experiences on patient safety cases, a focus-group interview method was used. The Kolb's experiential learning model was used as a reference model. Findings : Without deep reflective reasoning about specific experiences, there is no creative or innovative solutions to experiment actively. Nurses are likely to be reluctant learners when there is no systemic support from formal departments which is in charge of patient safety and quality of care. Conclusion : In order to build patient safety culture in hospital, there should be efforts to make nurses as active learners on patient safety as well as to build learning environments in medical units.

• 한국수학교육학회지시리즈A:수학교육
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• 제51권1호
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• pp.77-88
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• 2012

This qualitative research provides a situation model, which is designed for promoting learning of eigenvalue and eigenvector. This study also demonstrates the usefulness of the model through a small groups discussion. Particularly, participants of the discussion were asked to decide the numbers of milk cows in order to make constant amounts of cheese production. Through such discussions, subjects understood the notion of eigenvalue and eigenvector. This study has following implications. First of all, the present research finds significance of situation model. A situation model is useful to promote learning of mathematical notions. Subjects learn the notion of eigenvalue and eigenvector through the situation model without difficulty. In addition, this research demonstrates potentials of small groups discussion. Learners participate in discussion more actively under small group debates. Such active interaction is necessary for situation model. Moreover, this study emphasizes the role of teachers by showing that patience and encouragement of teachers promote students' feeling of achievement. The role of teachers are also important in conveying a meaning of eigenvalue and eigenvector. Therefore, this study concludes that experience of learning the notion of eigenvalue and eigenvector thorough situation model is important for teachers in future.