• 한국생산제조학회지
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• 제6권1호
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• pp.7-17
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• 1997

During the past decade, there were many well-established theories for the adaptive control of linear systems, but there exists relatively little general theory for the adaptive control of nonlinear systems. Adaptive control technique is essential for providing a stable and robust performance for application of industrial robot control. Neural network computing methods provide one approach to the development of adaptive and learning behavior in robotic system for manufacturing. Computational neural networks have been demonstrated which exhibit capabilities for supervised learning, matching, and generalization for problems on an experimental scale. Supervised learning could improve the efficiency of training and development of robotic systems. In this paper, a new scheme of adaptive-neuro control system to implement real-time control of robot manipulator using digital signal processors is proposed. Digital signal processors, DSPs, are micro-processors that are developed particularly for fast numerical computations involving sums and products of variables. The proposed neuro control algorithm is one of learning a model based error back-propagation scheme using Lyapunov stability analysis method. The proposed adaptive-neuro control scheme is illustrated to be an efficient control scheme for implementation of real-time control for SCARA robot with four-axes by experiment.

• 컴퓨터교육학회논문지
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• 제10권2호
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• pp.77-87
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• 2007

본 연구는 오프라인 수업을 온라인 토론이 보조하는 블렌디드 러닝 형태의 대학교 수업 상황에서 학습자의 적에 미치는 사회 연결망의 효과를 분석하기 위해 수행되었다. '사이버 학습 세미나' 과목을 수강하는 36명의 교육대학교 학생들을 대상으로 교우 연결망 중심도, 조언 연결망 중심도, 그리고 적대 연결망 중심도 등 세 가지 사회 연결망 변수들을 측정한 후, 이를 기말 과제 및 시험 점수 등 학습자 성과 변수들과의 상관관계를 분석하였다. 그 결과, 조언 연결망 중심도와 교우 연결망 중심도는 학습 성과와 정적 상관관계를 보이고 있었던 반면, 적대 연결망 중심도는 대부분분의 성과 변수들과 부적 상관관계를 보였다. 온라인 토론의 양과 질은 교우 연결망 중심도 및 조언 연결망 중심도와 높은 상관을 보였으며, 특히 그 질은 조언 연결망과 매우 높은 정적 상관관계를 나타내었다.

• 전자공학회논문지B
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• 제31B권9호
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• pp.57-66
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• 1994

In this paper, we present an iterative learning method of compensating for position sensor error. The previously known compensation algorithms need a special perfect position sensor or a priori information about error sources, while ours does not. to our best knowledge, any iterative learning approach has not been taken for sensor error compensation. Furthermore, our iterativelearning algorithm does not have the drawbacks of the existing interativelearning control theories. To be more specivic, our algorithm learns an uncertain function itself rather than its special time-trajectory and does not reuquest the derivatives of measurement signals. Moreover, it does not require the learning system to start with the same initial condition for all iterations. To illuminate the generality and practical use of our algorithm, we give the rigorous proof for its convergence and some experimental results.

• 한국과학교육학회지
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• 제24권1호
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• pp.76-89
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• 2004

Recent studies of science and technology "in-the-making" revealed that the process of designing material artifacts is not a straightforward application of prior images or theories by one (or more) person(s) isolated from his or her (their) environment. Rather, designing is a process contingent on the social and material setting for both engineering designers and students. Over the past decade, designing technological artifacts has emerged as an important learning environment in science classrooms. Through the analyses of a large database concerning an innovative simple machines curriculum for sixth-and seventh-grade students, we accumulated valid evidence for the nature of the designing process and science learning through it. In this paper, we show that design actions intertwine with the transformation of the objectified raw materials and artifact, the designer collective, and the mediating tools enabling that transformation, which constitute the elements of an activity from the perspective of cultural-historical activity theory. We conceptualize the continuous change of relation between material artifacts, designers, and tools throughout the design activity as co-evolution. Two episodes were selected to exemplify synchronic and diachronic change of relations inherent in co-evolving activity system. Finally, we discuss the implications of co-evolution during design activity for science learning.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.110.4-110
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• 2002

In practical control area, there are many examples with multiple objectives which may conflict or compete with each other like overhead crane control, automatic train operation, and refuse incinerator plant control, etc. These kinds of control problems are called multiobjective control problems, where it is difficult to provide the desired performance with control strategies based on single-objective optimization. Because the conventional control theories usually treat the control problem as the single objective optimization problem , the methods are not adequate to treat the multiobjective control problems. Particularly, in case of large scale systems or ill-defined systems, the multiple obj..

• 대한가정학회지
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• 제44권2호
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• pp.13-23
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• 2006

The purpose of this study was to explore 6 preservice teachers's perceptions and practices on children and teaching while they implemented the Project Approach. Using qualitative research, data were collected from individual and group reflections, interviews, classroom observations, and videotaping. Results showed that preservice teachers recognized the importance of observing children in context and the meaning of learning through the Project Approach. Preservice teachers developed their identities through reflective thinking on their theories and practices.

• 음성과학
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• 제5권2호
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• pp.7-16
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• 1999

Starting as a poet, I learned about the sounds of words with David Abercrombie. Then, remembering my background in physics, I moved to studying acoustic phonetics and speech synthesis. From there I learned about psychology and how. to test perceptual theories. A meeting with a physiologist led to work on the use of the respiratory muscles in speech. Later I landed in Africa teaching English phonetics and learning about African languages. When I went to UCLA to set up a lab I was able to find bright students who helped make computer models of the vocal tract and taught me linguistic theory. And I was able to continue wandering around the world, describing the sounds of a wide range of languages.

• 대한수학교육학회지:수학교육학연구
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• 제9권1호
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• pp.51-80
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• 1999

The paper reviews of the constructivist view of mathematics and mathematics education. First of all, we shall study how mathematics has been treated as an object of cognition in philosophy or cognitive theories, what is changed in modern mathematics. It can lead us to understand the constructivist perspective on mathematics. Secondly, we will examine the view, the teaching and learning principles of mathematics education based on constructivism. Didactic transposition theory will be used as a frame of reference for this examination.

• 한국정보통신학회논문지
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• 제7권5호
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• pp.853-862
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• 2003

본 논문에서는 퍼지 이론을 이용한 학습 평가 방법을 제안하였다. 제안된 학습 평가 방법은 정보처리 데이터베이스 과목에 대한 기출문제의 출제 빈도수를 3등급으로 분류하고 이것을 중요도라 정의하였다. 학습 중요도에 따른 학습 횟수에 대한 퍼지 소속도와 형성평가 점수에 대한 퍼지 소속도를 각각 9개의 퍼지 추론 규칙에 적용하여 학습 이해도를 평가하였다. 최종적인 학습 평가는 각 장별 학습 이해도에 대한 퍼지 등급과 총괄평가 점수에 대한 소속도를 이용하여 퍼지 추론규칙에 적용하고 비퍼지화하여 평가하였다. 제시된 퍼지 이론을 이용한 학습 평가 방법은 학습자가 스스로 학습한 내용을 진단 할 수 있도록 도와주며, 학습목표의 성취여부를 종합적이고 객관적으로 판단할 수 있는 방법을 제공한다.

• 한국컴퓨터정보학회논문지
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• 제13권6호
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• pp.69-76
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• 2008

인터넷은 시간과 공간에 제약받지 않으면서 인간이 원하는 일을 처리할 수 있게 해주는 필수적인 매체로 자리잡고 있다. 교육 분야 역시 정보통신 기술 발달의 영향을 많이 받고 있으며 CAI, 원격강의, e-러닝 등 새로운 분야들이 끊임없이 출현하고 있다. 교육 분야의 발전과는 달리, 학습 평가방법에 있어서는 다양한 시도가 이루어지지 못하고 지필시험에 대한 정답률에 전적으로 의존하고 있으며 학습활동과정 및 학습자 수준 등에 대한 부분은 반영되지 못하였다. 학습 평가는 학생의 학습능력 수준을 파악할 수 있고 그에 맞는 교수법을 사용하거나 새로운 학습 프로그램을 개발하는데 중요한 정보를 제공한다. 본 논문에서는 행동주의 학습이론의 평가방식에 의존하고 있는 기존 학습평가 시스템의 한계점을 개선하기 위하여 구성주의를 도입하여 학습활동을 평가점수에 반영할 수 있는 웹기반 학습평가시스템을 구축한다. 이를 통하여 학습자의 학습 이해도 뿐만 아니라 학습 관심도에 대한 분석 평가를 할 수 있다. 본 연구에서는 전통적인 행동주의 학습이론 평가방식과 함께 구성주의 학습이론 평가를 도입하기 위하여 교사에 의해 학습평가요소 및 반영비율을 설정하는 기능을 구현하고 이를 최종 평가점수에 반영되도록 하였다.