• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.526-529
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• 2017

Deep Drive 플랫폼 개발 기술인 HILS(Hardware In the Loop Simulation)는 시스템 모델에 근간을 둔 실시간 시뮬레이션 기법과 H/W를 접목시킨 실시간 해석 기법으로, 플랫폼 개발으로 현재는 난해성이 있는 자율 주행 자동차 실차의 테스트 베드를 구현하여, 여러 가지 실험을 통해 실제 차의 운행에 대한 피드백을 제공, 운전자로부터 안전을 보장하기 위한 기술 보장, 기술의 상용화, 양산화 연구에 도움을 줄수 있음.

• Journal of Digital Convergence
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• v.19 no.5
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• pp.57-67
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• 2021

This study explores what factors influence college students' synchronous online learning satisfaction and what advantages and disadvantages exist when it comes to taking synchronous online learning courses. In-depth interview results suggest that advantages of synchronous online learning are convenience (no need for travel, no limitation for study place), saving money, and no worry for contracting Corona 19. However, disadvantages of synchronous online learning are instability of online learning system, lack of interaction between learners and educators, difficulty of instant communication, low education quality, and unfairness of exams. This study found that college students taking synchronous online course think that synchronous online learning is more appropriate for theory-based course than practice-based courses in that theory-based courses are lecture-oriented while practice-based courses require interactivity between learners and educators. This study provides educators a baseline understanding on how college students think over synchronous online learning and how to enhance students' satisfaction with synchronous online learning.

• Journal of the Korean Chemical Society
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• v.56 no.5
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• pp.648-657
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• 2012

This study is examined for the effects of question generating strategy and feedback(teacher feedback and student peer reviews) on science achievement, self-efficiency and perception of the class in the middle school. Three classes of middle school 1st grade in a city were sampled for the study. The students in comparative group took traditional lessons and solved questions presented on worksheets distributed by a teacher. On the other hand, the students in the experimental groups 1 and 2 generated and solved questions by themselves after traditional lessons and then participated in the activity with peer's feedback and teacher's feedback, respectively. A self-efficiency test had been conducted before the treatments and the various tests such as achievement, self-efficiency and the perception of the class were carried out after treatments. The statistical results were analysed by ANCOVA, MANCOVA and t-test. The results of this study were as follows: First, there was significant difference between the control and experimental groups in the science achievement test (p<.01). But there was no significant difference between the experimental groups (p>.05). Second, both of the experimental groups showed enhanced self-efficiency compared with comparative group (p<.01). In sub-areas of self-efficiency, there were also meaningful results in the area of self-efficiency for control experimental group 1(p<.01), and in the area of difficulty preferences for experimental group 2 (p<.01). Third, the experimental group 1, given teacher's feedback, showed more positive perception of the class than the experimental group 2 that was given peer's feedback (p<.01).

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.419-422
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• 2000

본 논문에서는 길을 기반으로 하여 학습자 스스로 학습의 장면을 결정하고, 학습의 형태를 계획하여 학습을 주도적으로 이끌어 낼 수 있도록 하는 학습자 중심의 자기주도적 학습 환경을 선계 및 구현하였다. 학습 설계 대상은 학습자와 길 사이의 동적 상호작용을 통하여 지필 학습방법으로 학습하기 힘들었던 단원인 고등학교 공통수학의 삼각함수를 선택하였다. 학습자가 학습장면에서 직접 실행해 보고 도형을 이동시켜 변화하는 현상을 관찰하고 탐구함으로써 실시간으로 피드백이 가능하여 학습의 효과를 극대화하였으며 학습자에 대한 정보와 학습의 상태는 DB를 이용하여 관리하도록 하였고 형성평가와 총괄평가는 DB를 이용하도록 설계하였다.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.163-164
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• 2016

실용음악 산업 분야는 비약적인 기술력의 발전이 있었지만 그런 기술력이 실용음악 교육에 적극적으로 적용되지 않고 있다. 본 논문에서는 음악 산업현장에서 음원 콘텐츠 제작 시 보컬리스트의 음정 보정을 위해 개발된 오토 튠(auto tune) 기술을 활용하여 가창 연주 시 음정과 박자에 관한 실시간 피드백을 시각적으로 학습자에게 제공하는 방식의 학습법을 개발했다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.421-424
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• 2010

수업역량향상을 위해 최근 각 학교별 수업행동분석실을 갖추고 있는 추세이다. 하지만 수업행동분석실은 많은 비용, 시연자와 분석자에 대한 시공간적 제약, 비효율적인 피드백 방법, 사후 자가분석 어려움 등 많은 문제가 존재한다. 본 논문에서는 온라인 수업행동분석시스템 설계를 통해 물리적 공간 설치의 비용을 절감하고 전문가 참여를 위한 시간적 제약을 극복할 수 있는 방법을 제안하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.6
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• pp.1369-1380
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• 2011

Most existing mobile distance learning systems are asynchronous ones that allow students to download lecture video and presentation material. However, there are a few synchronous real-time mobile distance learning systems that support slide, annotation, feedback from student, and lecture video and audio at the same time. These live mobile distance learning systems have an advantage of supporting real-time interaction between students and a lecturer thereby making students understand the lecture better. But, they also have a disadvantage in the sense that they don't allow students to experience the past lecture. This problem can be solved by recording and replaying lecture session. So far, there are few mobile distance learning systems that support session recording and replay. This paper presents a synchronous mobile distance learning system that supports video and audio, slide with annotation, and real-time feedback from students, as well as session recording and replay, which is not supported by the existing mobile distance learning systems. The evaluation of the system among students shows that 61.3% of them were satisfied while 3.2% weren't.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.3
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• pp.119-126
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• 2017

In the clinical setting, the pressure bio-feedback device is used for the spinal rehabilitation of patients with back pain, but it has several disadvantages. The purpose of this study was to develop a digitalized pressure biofeedback system that provides precise exercise method and posture in real time during the spinal rehabilitation exercise by sensing and monitoring body movements and balance of users and providing biofeedback to users. After that, the usability testing for a digitalized pressure biofeedback system will be conducted to identify problems such as safety, performance, operability, and satisfaction, and suggest improvement directions. A total of 33 subjects were participated in the usability testing. The experts group and the users group evaluated the developed digitalized pressure biofeedback system on a scale of 5 points after using the equipment. In the user group, safety was 3.59, operability was 4.38, satisfaction was 4.49. In the expert group, safety was 2.86, operability was 3.91, and performance was 4.28. Based on the usability evaluation, if the problems of stability of the cradle for tablet PC, air injection, screen display, etc. are solved, it becomes a exercise device capable of accurately exercising and evaluating the function of the spine by checking its own motion state while the spinal stabilization exercise.

• Journal of the Korean School Mathematics Society
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• v.24 no.1
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• pp.83-105
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• 2021

In this paper, we analyzed the misconceptions and errors incurred during factorization learning. We also examined whether online individualization classes had a positive effect on students' mathematical achievement. The experiment was conducted for 4 weeks (16 times in total) on middle school juniors in rural areas of Gyeonggi Province, where the influence of private extra education was small. In the class, the 'Google Classroom' was used as a LMS, the video lecture was uploaded to YouTube, and the teacher interacted with the students through "Zoom" and "Facetalk". In the online class situation, students' assignments and test answers were checked in real time through 'Google Classroom', and immediate feedback was provided to the experimental class group's students. However, for the control group students, feedback was provided only to those who desired. A total of 7 achievement evaluations were conducted in the order of pre-test, formative evaluation (5 times), and post-test to confirm the change in students' ability improvement and achievement. Through the formative evaluation analysis, it was possible to grasp the types of errors and misconceptions that occured during the factorization process. Students' errors were divided into four types: theorem or definition distortion error, functional errors such as calculation, operation, and manipulation, errors that do not verify the solution, and no response. As a result of ANCOVA, the two groups did not show any difference from the 1st to 4th formative assessment. However, the 5th formative assessment and post-test showed statistically significant differences, confirming that online individualization classes contributed to improvemed achievement.

• Journal of Navigation and Port Research
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• v.31 no.6
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• pp.523-530
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• 2007

Crane systems are very important in industrial fields to carry heavy objects such that many investigations about control of the systems are actively conducted for enhancing its control performance. This paper presents an adaptive control approach using the model matching for a complex 3-DOF nonlinear crane system. First, the system model is linearized through feedback linearization method and then PD control is applied in the approximated model. This linear model is considered as nominal to derive corrective control law for a perturbed crane model using Lyapunov theory. This corrective control is primitively aimed to compensate real-time control deviation due to partially known perturbation. We additionally study stability analysis of the crane control system using Lyapunov perturbation theory. Evaluation of our control approach is numerically carried out through computer simulation and its superiority is demonstrated comparing with the classical control.