• Educational Technology International
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• 제22권2호
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• pp.199-225
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• 2021

The aim of the current study was to suggest priorities needed to be considered by university instructors when designing online learning. Based on three types of interactions (learner-content, learner-instructor, and learner-learner interactions) for effective online learning (Moore, 1989), draft questionnaires representing each type of interaction were written. After examining content validity by two Ph.D. experts, the survey was constructed with an Importance-Performance Analysis (IPA) form. Data of 133 university instructors were collected online. Results showed that support for designing learner-learner interaction was the priority for improving online learning. In terms of learner-instructor interaction, instructors needed to provide social-emotional support to learners so that learners could have a sense of belonging. For learner-instructor interaction, supporting instructors to monitor the level of understanding was the most highly demanding strategy for online learning. Limitations and suggestions for further studies were discussed.

• 한국과학교육학회지
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• 제27권2호
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• pp.126-133
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• 2007

The 'Science and Technology Mania' award program is an annual nationwide award activity organized to provide teenagers with opportunities for engaging in a high-technology-based long-term project work. The task involves designing a model ship propelled by the Lorentz force (a Lorentz ship) that allows diverse approaches irreducible to one right answer, and thus adopts features of science and technology in-the-making, In this study, we attend to opportunities for learning science that the uncertain aspects of artifact-designing project provide with participants, particularly when students communicate with scientists about their design practices. We analyze oral presentation sessions of the program and articulate two findings. First, students articulate embodied knowing in the presence of scientists. Second, students enact discursive resources deployed in concrete action. We conclude that students' design practices constitute referent that communication is directed toward and therefore become resources for developing scientific discourse.

• 과학교육연구지
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• 제33권2호
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• pp.271-289
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• 2009

이 연구는 생물학자와 과학영재의 실험설계활동에서 나타나는 과정요소와 특성을 분석한 것이다. 연구대상으로 동물행동생태를 전공한 생물학자 4명과 과학영재 생물반 학생 32명을 선정하였고, 연구를 위해 주어진 과제는 Fowler(1990)의 DCT이다. 그들의 실험설계활동과 관련된 모든 자료를 수집하였고, 이 자료를 분석하기 위한 분석틀을 개발하였다. 분석 결과, 첫째, 생물학자와 과학영재의 실험설계활동에서 나타난 과정요소는 문제 확인, 준비물 열거, 실험대상에 대한 고려, 변인 탐색, 변인 소거, 변인 선택, 변인 조작 방법 계획, 환경적 변인 통제 계획, 생물적 변인 통제 계획, 관찰 측정 방법 계획, 자료 수집 계획, 자료 해석 계획, 실험의 반복 계획, 측정의 반복 계획, 안전 수칙으로 총 15가지가 있다. 생물학자는 특정한 과정요소에 집중하는 반면, 과학영재는 정형화된 과정요소를 나타냈다. 둘째, 생물학자와 과학영재의 실험설계활동에서 나타난 특성을 종합하면 다음과 같다: 1) 생물학자와 과학영재 모두 영역특수적인 과정기술이 포함된 과정요소를 나타냈다. 2) 생물학자는 특정한 과정을 반복적으로 점검하면서 정교하게 실험을 설계하는 반면, 과학영재는 피상적으로 실험을 설계한다. 3) 생물학자는 영역특수적인 기술과 노하우를 가지고 있으나, 과학영재는 그렇지 않다. 이러한 결과는 과학영재의 실험설계활동 교육 프로그램은 생물학자들이 집중하는 과정요소를 중심으로 구성하고, 정교한 실험 설계를 할 수 있도록 피드백을 제공하고, 생물학자의 과정기술이나 노하우를 학습할 수 있는 형태로 개발되어야 함을 시사한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1185-1190
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• 2011

In designing cut and cover tunnels, load combination applied Korea seismic design code of urban transit and its sections applied Korea concrete code 2003. However, by revision of Korea concrete code in 2007, engineers have been experiencing difficulties in their work. In this study, application of Korea concrete code 2007 for designing is reviewed by comparing load combination of related codes and member force.

• ETRI Journal
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• 제30권1호
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• pp.170-172
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• 2008

A substitution box (S-box) plays a central role in cryptographic algorithms. In this paper, an efficient method for designing S-boxes based on chaotic maps is proposed. The proposed method is based on the mixing property of piecewise linear chaotic maps. The S-box so constructed has very low differential and linear approximation probabilities. The proposed S-box is more secure against differential and linear cryptanalysis compared to recently proposed chaotic S-boxes.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.309-312
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• 2002

Advances in networking infrastructure have led to the development of a new type of "computational grid" infrastructure that provides predictable, consistent and uniform access to geographically distributed resources such as computers, data repositories, scientific instruments, and advanced display devices Such Grid environments are being used to construct sophisticated, performance-sensitive applications in such areas as dynamic, distributed real-time applications. In this paper, we propose a toolset for designing distributed real-time systems based on computational grid. The toolset is based on a new methodology and integrates the models that methodology Proposed for designing real-time systems.

• International journal of advanced smart convergence
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• 제3권1호
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• pp.11-14
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• 2014

We have been designing human interactions for some learning support system or education system. The design is based on a symbol grounding model. The model is applicable to many learning domains using virtual reality technology. The design policy is simple and compact. In order to realize the policy we use/reuse some devices from the viewpoint of virtual reality. This paper introduces basic ideas and explains several example cases based on the idea.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.42-47
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• 1993

Importance of separation of a nonlinear dynamical system into nonlinear static part and linear dynamical part was insisted in designing a controller for the nonlinear system. We further proposed compensation techniques for oscillation of controlled variables caused by system time delay and compensation of steady state errors caused by modelling errors of the systems. The proposed principle of designing procedure and the compensation methods were discussed by applying them for temperature and level control of an actual tanked water system.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.163-166
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• 2004

This paper proposes decomposition-based approach for developing the evaluation factors of performance measures and designing performance measures in manufacturing system. In this paper, the evaluation factors are designed by design decomposition approach and the design process of performance measures is based on the manufacturing system design decomposition.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.689-692
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• 2000

This paper presents a designing for the Off-line UPS usig SMB Flywheel Energy Storage System. This described flywheel energy storage system is designed to replace of the conventional EMB(Electro Mechanical Battery) system. To realize the high efficiency and to minimize the torque ripple the waveform of the inverter output current is controlled to be sinusoidal. The actual performance of the Off-line UPS using flywheel energy storage system is described. The prototype device was manufactured, The experimental result has good characteristics at a time of power transition region and regeneration modes,