• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.46 no.4
• /
• pp.312-320
• /
• 2023

Recently, there has been an increasing attempt to replace defect detection inspections in the manufacturing industry using deep learning techniques. However, obtaining substantial high-quality labeled data to enhance the performance of deep learning models entails economic and temporal constraints. As a solution for this problem, semi-supervised learning, using a limited amount of labeled data, has been gaining traction. This study assesses the effectiveness of semi-supervised learning in the defect detection process of manufacturing using the MixMatch algorithm. The MixMatch algorithm incorporates three dominant paradigms in the semi-supervised field: Consistency regularization, Entropy minimization, and Generic regularization. The performance of semi-supervised learning based on the MixMatch algorithm was compared with that of supervised learning using defect image data from the metal casting process. For the experiments, the ratio of labeled data was adjusted to 5%, 10%, 25%, and 50% of the total data. At a labeled data ratio of 5%, semi-supervised learning achieved a classification accuracy of 90.19%, outperforming supervised learning by approximately 22%p. At a 10% ratio, it surpassed supervised learning by around 8%p, achieving a 92.89% accuracy. These results demonstrate that semi-supervised learning can achieve significant outcomes even with a very limited amount of labeled data, suggesting its invaluable application in real-world research and industrial settings where labeled data is limited.

• Hwankyungkyoyuk
• /
• v.14 no.2
• /
• pp.51-67
• /
• 2001

In this study we developed a framework to evaluate environmental education programs through lived experience in nature and the framework was applied to a neat case,'2001 Green Camp'. The framework consists of 4 items; goals and objectives, instructional planning, teaching and learning, methods and learning operation and environment. Learning outcomes such as changes to the levels of knowledge, attitude, participation and environmental sensitivity are not included in the evaluation framework but evaluated through direct questions to students. Two researchers observed and evaluated programs with the framework. This study reflected various perspectives of researchers, teachers, students and staff members.

• Asia pacific journal of information systems
• /
• v.9 no.3
• /
• pp.177-194
• /
• 1999

Identifying knowledge as the single most important asset ultimately defining organizational competitiveness, enterprises are trying to move towards knowledge-oriented practices. Such practices have given rise to learning and agile organization, This paper presents applied information technologies to realize the learning and agile organization, focusing on systems thinking. Firstly, in order to establish a framework for the systems thinking, an information systems development method based on process chain is proposed. Then, an agent-based microworld simulation approach is presented. The approaches provide visible and analytical information to knowledge workers so that they can have systems thinking capabilities eventually. Various microworlds on the top of the information system can be constructed with agents and simulated for possible business events. All decision makings are dynamic in nature. To let knowledge workers look ahead the possible outcomes of the whole relevant processes is the core capability of the approaches. Through watching, the knowledge workers would be able to acquire new insights or problem solving knowledge for the problem in hand.

• Korean Journal of Clinical Pharmacy
• /
• v.27 no.2
• /
• pp.55-62
• /
• 2017

Experiential education is a core curriculum of pharmacy education. In experiential education, formative feedback is an integral component of learning and teaching process. Feedback is defined as information provided by a preceptor regarding student's performance based on direct observation. With effective feedback, students can have opportunities to reinforce or correct behaviors and to acquire knowledge or skills. Students highly value and appreciate feedback. They rank provision of effective feedback as one of the most important qualities of preceptors. Preceptors, however, lack an understanding of feedback or practical skills necessary for providing effective feedback. As a result in reality, the feedback provided to students can be differentially effective in improving students' learning. This article describes a theoretical understanding of feedback including definition and value, as well as types of feedback. In addition, practical aspects in providing feedback, such as contents, timing, techniques, and models, are addressed. By understanding the value of feedback and mastering various feedback skills, preceptors will promote students' learning and enhance educational outcomes of experiential education.

• Journal of Engineering Education Research
• /
• v.17 no.6
• /
• pp.62-68
• /
• 2014

The purpose of this work is to provide systematic lecture materials for instructers who search for the effective teaching of applied mechanics of materials course with respect to lecture contents, teaching methods, and itemized course evaluations according to each class learning objective. For this. the evolution of teaching contents since 2010 until 2014 are briefly depicted and then most recent course learning objectives, lecture contents, and evaluation schemes are presented in detail. The results of this study may be used as base line data for the lecturers who teach similar courses and for the evaluation of program outcomes in ABEEK scheme through course-embedded assessment.

• Research in Mathematical Education
• /
• v.22 no.2
• /
• pp.83-97
• /
• 2019

Science, Technology, Engineering, and Mathematics (STEM) education has been at the forefront of K-12 curricula in the technology-rich 21st century, with emphasis on how these fields reinforce each other in preparing students for a dynamic future. However, there is a need for greater attention to STEM education research in the mathematics education community, in particular to pedagogical approaches that facilitate integrating the mathematics component of STEM education. Toward this end, the authors report the outcomes of a Project-based Learning (PBL) unit in which upper elementary students integrated STEM elements by researching, crafting, testing, and evaluating kites they created by applying scientific knowledge of aerodynamics and mathematical knowledge of polygons, surface area, graphs, and data analysis. This unit, which the authors developed, implemented, and assessed, demonstrates how STEM subjects and in particular mathematics can be effectively integrated in upper elementary school classrooms through PBL.

• Earthquakes and Structures
• /
• v.22 no.4
• /
• pp.401-419
• /
• 2022

A novel hybrid extreme machine learning-multiverse optimizer (ELM-MVO) framework is proposed to predict the liquefaction phenomenon in seismically excited tunnel lining inside the sand lens. The MVO is applied to optimize the input weights and biases of the ELM algorithm to improve its efficiency. The tunnel located inside the liquefied sand lens is also evaluated under various near- and far-field earthquakes. The results demonstrate the superiority of the proposed method to predict the liquefaction event against the conventional extreme machine learning (ELM) and artificial neural network (ANN) algorithms. The outcomes also indicate that the possibility of liquefaction in sand lenses under far-field seismic excitations is much less than the near-field excitations, even with a small magnitude. Hence, tunnels designed in geographical areas where seismic excitations are more likely to be generated in the near area should be specially prepared. The sand lens around the tunnel also has larger settlements due to liquefaction.

• Journal of The Korean Association of Information Education
• /
• v.10 no.1
• /
• pp.143-152
• /
• 2006

The aim of this study was to analyze effects of a blended learning program based on case study approach and to suggest implications in appropriately evaluating blended learning in practices for corporate education and training. In order to achieve the goal, issues such as the ones related to blended learning including development and status quo of blended learning programs in the field of corporate education and training and operation models for the blended learning were reviewed. Then, the outcomes of a blended learning program were completely analyzed through systems approach. The methodology of the study was a mixed research method which was comprised of quantitative and qualitative approaches. The results of quantitative analysis showed that blended learning itself seemed to have significant effects on the leadership capability in general assessment and self assessment. The most viable effects of blended learning in leadership training are said to be actual change of actions and activities in leadership capability of the participants followed by changes in their job tasks contributing to improving the managerial performance of the company, good transfer to current job tasks, and implementation of the practice plans.

• Journal of Korean Elementary Science Education
• /
• v.33 no.4
• /
• pp.620-633
• /
• 2014

This study was to examine elementary students' expectations on informal science learning in science museums which have characteristics of free choice learning. $5^{th}$ and $6^{th}$ grade students in two different elementary schools in Gyeonggi province participated in the survey and 330 samples were collected. Subcategories for the survey were categorized on the basis of review of the literature about the learning outcomes from science museums. The survey instruments were developed following the idea of each subcategory from the learning in science museums and a content validity of the survey instruments was checked. The results were as follows: Generally students' had high expectations of all subcategories and developing their interests in science through science museums was confirmed the most. Moreover, expectations on learning in science museums were differences between gender and grade. Finally, it was found that grade differences of expectations on learning in science museums were affected by intrinsic motivation, and empirical activity were affecting the gender differences of those. Based on the results of study, elementary students could confirm that the science museums had the important values and possibility as a field of informal science learning. And this study implied that the science museums could enhance more educational roles of informal science learning.

• Journal of the Korea Convergence Society
• /
• v.7 no.2
• /
• pp.33-41
• /
• 2016

This study was convergence study conducted to examine the effects of problem-based learning(PBL) on self-directed learning ability, problem solving skills, academic self-efficacy, motivation toward learning in adult nursing care. This study was one-group pretest-posttest design. 51 students in the second year were recruited. After the PBL education, The participants showed much improvement in two areas of problem solving skills(t=3.30, p=.002) and Motivation toward Learning(t=3.004, p= .004). In the case of self-directed learning ability(t=1.451, p= .153) and academic self-efficacy(t=-1.04, p= .304), these have not showed a statistically significant change. The results indicate that the PBL education is effective in improving some areas of students' learning competency. Further study is needed to develop PBL programs for various clinical topics and evaluate the effectiveness on the learning outcomes.