• Journal of Electrical Engineering and information Science
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• 제2권6호
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• pp.191-196
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• 1997

Fuzzy clustering has been playing an important role in solving many problems. Fuzzy c-Means(FCM) algorithm is most frequently used for fuzzy clustering. But some fixed point of FCM algorithm, know as Tucker's counter example, is not a reasonable solution. Moreover, FCM algorithm is impossible to perform the on-line learning since it is basically a batch learning scheme. This paper presents unsupervised learning networks as an attempt to improve shortcomings of the conventional clustering algorithm. This model integrates optimization function of FCM algorithm into unsupervised learning networks. The learning rule of the proposed scheme is a result of formal derivation based on the gradient descent procedure of a fuzzy objective function. Using the result of formal derivation, two algorithms of fuzzy cluster analysis, the batch learning version and on-line learning version, are devised. They are tested on several data sets and compared with FCM. The experimental results show that the proposed algorithms find out the reasonable solution on Tucker's counter example.

• 한국과학교육학회지
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• 제11권1호
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• pp.15-24
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• 1991

The purpose of this study was to investigate the effectiveness of Learning Cycle approach to change the concept of density. The results of the study were as follows : 1) Students already had various types of preconception related to density before formal learning. These preconceptions mostly differ from scientific concepts. 2) Male students were much better than female ones in the development of scientific concepts before formal learning. These differences were found statistically significant(P<0.01). 3) The higher the cognitive level of the students, the better the development of scientific concepts. 4) In the change of preconceptions to scientific concepts by treatment, there was significant difference between control group and experimental group at the 0.05 level. It was found that Learning Cycle approaches were more effective than traditional approaches in acquiring the concept of density. 5) It was found that there was no significant difference On the retention level of the concept of density between control group and experimental group.

• East Asian mathematical journal
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• 제25권3호
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• pp.247-262
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• 2009

Permutation and combination are the part of mathematics which can be introduced the pliability and diversity of thought. In prior studies of permutation and combination, there treated difficulties of learning, strategy of problem solving, and errors that students might come up with. This paper provides the method so that meaningful teaching and learning might occur through the systematic approach of permutation and combination. But there were little prior studies treated counting numbers that basic of mathematics' action. Therefore this paper tries to help the understanding of permutation and combination with the process of changing from informal knowledge to formal knowledge.

• 인터넷정보학회논문지
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• 제22권4호
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• pp.13-28
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• 2021

강화학습은 한 환경에서 에이전트가 정책에 따라 액션을 취하고 보상 함수를 통해 액션을 평가 및 정책 최적화 과정을 반복하는 Closed-Loop 구조로 이루어진 알고리즘이다. 이러한 강화학습의 주요 장점은 액션의 품질을 평가하고 정책을 지속적으로 최적화 하는 것이다. 따라서, 강화학습은 지능형 시스템, 자율제어 시스템 개발에 효과적으로 활용될 수 있다. 기존의 강화학습은, 단일 정책, 단일 보상함수 및 비교적 단순한 정책 업데이트 기법을 제한적인 문제에 대해 제시하고 적용하였다. 본 논문에서는 구성요소의 복수성을 지원하는 확장된 강화학습 모델을 제안한다. 제안되는 확정 강화학습의 주요 구성 요소들을 정의하고, 그들의 컴퓨팅 모델을 포함하는 정형 모델을 제시한다. 또한, 이 정형모델을 기반으로 시스템 개발을 위한 설계 기법을 제시한다. 제안한 모델을 기반으로 자율 최적화 자동차 내비게이터 시스템에 적용 및 실험을 진행한다. 제시된 정형 모델과 설계 기법을 적용한 사례연구로, 복수의 자동차들이 최적 목적지에 단 시간에 도착할 수 있는 진화된 내비게이터 시스템 설계 및 구현을 진행한다.

• 대한화학회지
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• 제50권6호
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• pp.477-485
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• 2006

연구에서는 언어적 정보의 형태가 화학 개념 학습에서 제공되는 외적 표상들 간의 연계와 통합을 촉진하는 방안으로 도입된 그리기에 미치는 영향을 학생들의 언어적 학습 양식에 따라 조사하였다. 남녀공학 중학교 1학년 133명을 선정하여 그리기에서 언어적 정보를 형식적인 형태로 제공하는 FD(formal drawing) 집단과 개인화된 형태로 제공하는 PD(personalized drawing) 집단으로 배치한 후, ‘보일의 법칙'과 ‘샤를의 법칙'에 대하여 2차시 동안 수업을 실시하였다. 연구 결과, 개념 이해도 검사에서 PD 집단의 점수가 FD 집단의 점수보다 통계적으로 유의미한 차이로 높았다. 상황 흥미 검사에서는 두 집단에서 모두 언어적 학습 선호 학생들의 점수가 비선호 학생들의 점수보다 통계적으로 유의미한 차이로 높았다. 수업에 대한 인식 검사 결과에서는 많은 학생들이 그리기에서 언어적 정보를 형식적인 형태보다 개인화된 형태로 제공하는 것을 선호하였으며, 이에 대해 인지적, 정의적, 동기적 측면에서 긍정적으로 인식하는 것으로 나타났다. 특히, 언어적 학습 선호 학생들이 비선호 학생들보다 정의적, 동기적 측면에서 좀 더 긍정적으로 인식하는 경향이 있었다.

• ETRI Journal
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• 제41권5호
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• pp.608-618
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• 2019

We propose a general framework for keyed learning, where a secret key is used as an additional input of an adversarial learning system. We also define models and formal challenges for an adversary who knows the learning algorithm and its input data but has no access to the key value. This adversarial learning framework is subsequently applied to a more specific context of anomaly detection, where the secret key finds additional practical uses and guides the entire learning and alarm-generating procedure.

• 한국수학교육학회지시리즈A:수학교육
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• 제41권3호
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• pp.291-318
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• 2002

We investigated on the primary school children's abilities of formal reasoning. Seventy students in grade 5 participated in the study. They responsed their best reactions on the problems constituted of three parts requiring the informal or formal reasoning and generalization. Their reactions are classified by some criteria depending the level of reasoning. About 10 students showed that they constructed a kind of scheme for solving the problems, similar to formal reasoning and beyond naive informal reasoning. And about 30 students did so partially. We concluded that the teaching and learning of reasoning by the progressive increasing the degree of rigor from grade 5 is possible.

• 대한수학교육학회지:학교수학
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• 제4권4호
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• pp.555-563
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• 2002

The purpose of this paper is to try formulating a working definition of connection of informal and formal mathematical knowledge. Many researchers have suggested that informal mathematical knowledge should be connected with school mathematics in the process of learning and teaching it. It is because informal mathematical knowledge might play a important role as a cognitive anchor for understanding school mathematics. To implement the connection of them we need to know what the connection means. In this paper, the connection between informal and formal mathematical knowledge refers to the making of relationship between common attributions involved with the two knowledge. To make it clear, it is discussed that informal knowledge consists of two properties of procedures and conceptions as well as formal mathematical knowledge does. Then, it is possible to make a connection of them. Now it is time to make contribution of our efforts to develop appropriate models to connect informal and formal mathematical knowledge.

• 한국사회복지학
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• 제66권1호
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• pp.87-111
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• 2014

본 연구는 사회복지사의 일터에서 나타나는 무형식학습 방법을 분석하고, 인적자원개발 및 관리 차원에서 사회복지사의 역량강화를 위한 무형식학습 촉진방안을 탐색하는 것이 목적이다. 연구방법은 제주지역 소재 종합사회복지관에 근무하는 사회복지사 20명을 대상으로 한 질적 사례연구이다. 연구결과 사회복지사의 일터에서 일상적인 무형식학습 방법은 '상사의 피드백, 지인접촉, 회의참여, 자료 검토' 등이었다. 업무숙련 과정에서 가장 많이 활용된 무형식학습은 '상사의 피드백과 지인접촉'으로 인적자원과의 소통에 중점을 두었다. 이에, 사회복지기관에서는 사회복지사의 역량강화를 위해 보수교육과 같은 제도적인 형식학습 지원뿐 아니라 개인학습 지원, 비공식모임, 멘토링, 슈퍼비전, 동료와의 상호작용 등 무형식적 활동을 촉진하는 업무환경 조성이 필요하다는 제안을 하였다.

• 한국초등과학교육학회지:초등과학교육
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• 제23권4호
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• pp.273-278
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• 2004

According to Piaget, children aged 11 are in the middle of concrete operation period and formal operation period. So, it is necessary to adopt the Learning Cycle Model (LCM) which helps students improve their cognitive development. After determining the test for the Science Concept of Matter (SCOM), the experimental group showed higher average than the comparative group in the post-test. In the sound understanding, the experimental group showed higher ratio than the comparative group. And in the ratio of imperfect, wrong understanding and no response, the experimental group was lower than the comparative group. On the questions that were needed the complicated inquiry, many students of both groups still couldn't find the fundamental cause. In forming the scientific conceptualization, there was a meaningful difference (p < .001) after post-test Analysis of Covariance (ANCOVA) with pre-test result. After determining the test for the Test Inquiry Science Process (TISP), the experimental group showed higher average than the comparative group in the post-test. In the category of basic inquiry process which is needed in concrete operation, there was a meaningful difference (p < .05). In the category of unified inquiry process which is needed in formal operation, they showed no meaningful difference (p > .05). Therefore, applying the LCM to the chapter of 'Solution and Dissolving' is more effective on improving the scientific conceptualization and on helping the concrete operation abilities than the teacher centered learning.