• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2005.11a
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• pp.234-237
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• 2005

강화학습을 위한 많은 방법 중 정책 반복을 이용한 actor-critic 학습 방법이 많은 적용 사례를 통해서 그 가능성을 인정받고 있다. Actor-critic 학습 방법은 제어입력 선택 전략을 위한 actor 학습과 가치 함수 근사를 위한 critic 학습이 필요하다. 본 논문은 critic의 학습을 위해 빠른 수렴성을 보장하는 RLS(recursive least square)를 사용하고, actor의 학습을 위해 정책의 기울기(policy gradient)를 이용하는 새로운 알고리즘을 제안하였다. 그리고 이를 실험적으로 확인하여 제안한 논문의 성능을 확인해 보았다.

• Proceedings of The KACE
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• 2018.01a
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• pp.37-40
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• 2018

교육 학습은 미래사회 부(富)를 창출하는 인간중심의 가치지향적 무형자본을 키울 수 있는 원동력이며, 기술 사회의 변화는 미래형 교육 학습 환경의 혁신을 촉구하고 있다. 최첨단 학습환경은 학습자의 학업성과를 높이는데 효과적으로 작용하고 있으며, 교육현장에서의 다양한 학습전략 및 핵심 교육기술 도입 활성화를 통해 학습자의 자발적 학습동기가 촉구될 수 있다. 본 연구에서는 제 4차 산업혁명이 도래하고 있는 현 시점에서 디지털배지에 대한 도입 현황 및 해외 우수사례 분석을 통한 유의미한 시사점을 도출하고, 이를 통해 활용적 측면 및 성과적 측면에서 우리나라 미래교육 학습 현장에 효과적으로 적용할 수 있는 방안들을 제시하고자 한다.

• The Mathematical Education
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• v.58 no.1
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• pp.101-120
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• 2019

The goal of this study was to apply an expectancy-value model(Wigfield & Eccles, 2000) to explain changes in six multi-ethnic students' achievement motivation in mathematics during sixth (2012) to eighth (2014) grades. In order to achieve this goal, we used narrative research methods. Although individual students' achievement motivation and mathematics related life experiences differed, there are some common factors influencing their motivation development, especially (a) roles played by parents and teachers; (b) assessment of peers' competencies; (c) past learning experiences related to mathematics curriculum; (d) perception of the relationship between mathematics competency and other subjects; (e) home backgrounds; and (f) perceived task values. In this study, we achieved some insight into why some multi-ethnic students are willing to study hard to get good scores while others are uninterested in mathematics, and why some multi-ethnic students are likely to pursue new mathematical tasks and persist despite challenges, while others easily give up studying mathematics in the face of adversity. We argue that in order to increase and sustain multi-ethnic students' achievement motivation, educators and parents should recognize that motivation is contextually formulated in the intersection of current people, time, and space, not a personal entity formed in an individual's mind. The findings of this study shed light on the development of achievement motivation and can inform efforts to develop multi-ethnic students' positive motivation, which might influence their mathematics achievement and success in school.

• The Mathematical Education
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• v.53 no.4
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• pp.463-478
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• 2014

우리나라 중학교 2학년 학생들은 TIMSS와 같은 국제적인 평가에서 높은 수학 성취도를 보이고 있다. 성별 성취도를 분석하면 TIMSS 1995부터 TIMSS 2011까지 남학생이 여학생보다 지속적으로 높은 평균점수를 받고 있다. TIMSS 1995와 TIMSS 2011의 성별 점수 차이는 유의한 것으로 나타났다. TIMSS 2011에 참가한 42개국 중 성차가 없거나 여학생이 더 높은 성취도를 보인 국가는 35개국이며 남학생이 더 높은 성취도를 보인 국가는 우리나라를 포함하여 7개국이다. 수학 성취도의 성차는 사회문화적 요인과 수학학습태도와 연관이 있다는 여러 연구 결과가 있다. 본 연구는 TIMSS 2011에 참가한 중2학년 5,165명 남녀학생들의 수학성취도 결과를 분석하여 사회문화적 요인이 수학학습태도와 수학성취도에 미치는 영향을 찾아보았다. 연구결과 남녀학생의 교사선호도는 유의한 성차가 없었는데 학부모의 교육 참여도에 유의한 성차가 있었다. 여학생의 수학에 관한 가치와 수학에 관한 자신감은 남학생보다 유의하게 낮았다. 학부모의 교육 참여도는 여학생의 수학학습태도와 수학성취도에 더 높은 영향력을 미치는 것으로 나타났다. 학부모들의 교육 참여도를 높이고 여학생들의 수학에 관한 가치와 자신감을 높이기 위해서는 여학생들의 롤 모델과 여성들의 과학 분야의 진출을 장려하는 사회적 요인의 조성이 함께 필요하다.

• Journal of Practical Engineering Education
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• v.11 no.1
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• pp.87-103
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• 2019

The purpose of this study is to examine the factors affecting the intention of smart device internet usage from the perspective of lifelong learning of elderly people. Survey was conducted for understanding the factors affecting the internet usage intention of smart devices with 150 elderly people who visited the Gwangju Senior Technology Center (GSTC). The empirical results show that the perceived economic value and practical value of the elderly have a significant effect on the intention of utilizing the Internet of Smart Device. Although the moderating effect of the individual innovation of the elderly is not significant, Participation in social activities significantly moderated the relationship between perceived value and intention to use internet. In addition, the elderly expected that the quality of life would be improved via the use of smart devices.

• The Journal of Korean Association of Computer Education
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• v.3 no.1
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• pp.23-30
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• 2000

The educational effect and practical use of collaborative learning produced in virtual learning communities are being discussed actively in these days. A higher-level interactive tool is essential for successful Internet-based collaborative learning through the network. In this paper, we designed and implemented an integrated browser which has the integrated learning environment to support collaborative learning, and thus the user interface of the network client(News, FTP, HTTP, SMTP, voice text chatting Clients) is improved. Therefore, the educational effect of Internet-based collaborative learning is get closer to that of face-to-face learning.

• Journal of the Korean Chemical Society
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• v.44 no.3
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• pp.266-280
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• 2000

The purpose of this Study was to explore students' conceptual ecologies in the context of general chemistly learning. This study was implemented in the first semester of 1999 by natural study. We had nine voluntary participants. Data were collected from three semi-constructd interiews, and socio-cultural values. Among three categories, motivationa1 beliefs and socio-cultural values have more effcts rather than epistemology on the context of general chemistry learning, and three typical cases were presented as results of this study. We expect that results of this study will somewhat contribute to establish psychological and socio-cultural context of learning.

• Journal of the Korea Society of Computer and Information
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• v.28 no.3
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• pp.177-187
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• 2023

This study aims to validate a tool evaluating MOOCs for higher education from the perspective of education service. Based on the results of related researches, a potential model for evaluating MOOCs (4 factors and 8 sub-factors) was made. An evaluation tool consisting of 18 survey items was delivered to 138 college students. After data cleaning, 136 surveys were used for exploratory factor analysis (principal component analysis. varimax rotation) and reliability analysis that confirmed the fitness of the potential model. Four exploratory constructs and seven sub-factors were extracted: Factor I was labeled as 'Systemic Learning Experience,' Factor II, 'Value Experience,' Factor III, 'Co-creation of Value Experience,' and Factor IV, 'High Order Learning Experience.' Reliability estimates using Cronbach's alpha indicated that the evaluation tool had good internal consistency. In conclusion, the evaluation tool for MOOCs in higher education was proven to be valid and reliable.

• The Mathematical Education
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• v.60 no.3
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• pp.341-362
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• 2021

The purpose of this study is to explore the qualitative characteristics of pre-service teachers' motivation while they are participating in group activities for developing mathematical essay assessment problem and revising it. For this purpose, we analyzed individual factors about group learning activities as well as contextual factors about practical competency (in developing and revising mathematical essay assessment problem through collecting data of student responses to the problem). As results of data analyses, autonomy, among individual factors regarding group learning activities, was one of the main characteristics in attainment value, utility value, and intrinsic value, whereas task, authority, and grouping, among contextual factors regarding practical competency, appeared to have a positive impact on task value. These results suggest how to think of specific ideas and articulate them in designing a curriculum to develop student-evaluation expertise for pre-service teachers.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.7
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• pp.893-898
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• 2005

Due to the merits that only a small amount of computation is needed for solutions and stochastic policies can be handled explicitly, the actor-critic algorithm, which is a class of reinforcement learning methods, has recently attracted a lot of interests in the area of artificial intelligence. The actor-critic network composes of tile actor network for selecting control inputs and the critic network for estimating value functions, and in its training stage, the actor and critic networks take the strategy, of changing their parameters adaptively in order to select excellent control inputs and yield accurate approximation for value functions as fast as possible. In this paper, we consider a new actor-critic algorithm employing an RLS(Recursive Least Square) method for critic learning, and policy gradients for actor learning. The applicability of the considered algorithm is illustrated with experiments on the two linked robot arm.