• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.860-863
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• 1997

FCM(Fuzzy Cognitive Map) is a fuzzy signed directed graph for representing causal reasoning which has fuzziness between causal concepts. Authors have already proposed FCM-based fault diagnostic scheme. However, the previously proposed scheme has the problem of lower diagnostic resolution. In order to improve the diagnostic resolution, a new diagnostic scheme based on extended FCM which incorporates the concept of fuzzy number into FCM is developed in this paper. Furthermore, an enhanced TAM(Temporal Associative Memory) recall procedure and pattern matching scheme are also proposed.

• 충청수학회지
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• 제18권1호
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• pp.51-64
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• 2005

The object of this paper is to prove two unique common fixed point theorems for a pair of a set-valued map and a self map satisfying a general contractive condition using orbital concept and weak-compatibility of the pair. One of these results generalizes substantially, the result of Dhage, Jennifer and Kang [4]. Simultaneously, its implications for two maps and one map improves and generalizes the results of Dhage [3], and Rhoades [11]. All the results of this paper are new.

• 충청수학회지
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• 제18권1호
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• pp.1-22
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• 2005

The object of this paper is to introduce the concept of a pair of semi-compatible self-maps in a fuzzy metric space to establish a fixed point theorem for four self-maps. It offers an extension of Vasuki [10] to four self-maps under the assumption of semi-compatibility and compatibility, repsectively. At the same time, these results give the alternate results of Grebiec [5] and Vasuki [9] as well.

• Journal of the Korean Data and Information Science Society
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• 제14권3호
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• pp.501-510
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• 2003

Ordinary computer program in the context of MDS for providing separate graphs according to "individuals" is usually referred to as INDSCAL(individual difference scaling), which enables one to detect dissimilarities between "subjects". This article is concerned with applications of INDSCAL concept to MDPREF and perceptual map. Related algorithm is presented and is implemented through illustrative analysis of Korean credit card data.

• ETRI Journal
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• 제34권5호
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• pp.783-786
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• 2012

This letter proposes a more advanced joint maximum a posteriori (MAP) adaptation using a prior model based on a probabilistic scheme utilizing the bilinear transformation (BIT) concept. The proposed method not only has scalable parameters but is also based on a single prior distribution without the heuristic parameters of the previous joint BIT-MAP method. Experiment results, irrespective of the amount of adaptation data, show that the proposed method leads to a consistent improvement over the previous method.

• 대한수학회논문집
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• 제35권4호
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• pp.1309-1318
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• 2020

In this paper we extend the concept of topological stability from continuous maps to the corresponding induced maps and prove that a continuous map is topologically stable if and only if its induced map also is topologically stable.

• 제어로봇시스템학회논문지
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• 제12권7호
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• pp.693-699
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• 2006

An accurate and compact map is essential to an autonomous mobile robot system. For navigation, it is efficient to use an occupancy grid map because the environment is represented by probability distribution. But it is difficult to apply it to the large environment since it needs a large amount of memory proportional to the environment size. As an alternative, a topological map can be used to represent it in terms of the discrete nodes with edges connecting them. It is usually constructed by the Voronoi-like graphs, but in this paper the topological map is incrementally built based on the local grid map using the thinning algorithm. This algorithm can extract only meaningful topological information by using the C-obstacle concept in real-time and is robust to the environment change, because its underlying local grid map is constructed based on the Bayesian update formula. In this paper, the position probability is defined to evaluate the quantitative reliability of the end nodes of this thinning-based topological map (TTM). The global TTM can be constructed by merging each local TTM by matching the reliable end nodes determined by the position probability. It is shown that the proposed TTM can represent the environment accurately in real-time and it is readily extended to the global TTM.

• 한국지구과학회지
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• 제24권7호
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• pp.614-624
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• 2003

본 연구의 목적은 초등학교 화산 수업에서 학생들이 유의미 학습을 통해 성취도 향상을 이룰 수 있는 수업 전략의 한 방법으로 개념도 활용의 효과를 알아보는 것이다. 이를 위해 1개 초등학교 6학년 2개반 학생 80명의 학생들이 본 연구에 참가하였으며, 전통적인 수업방법으로 수업을 한 통제집단과 개념도를 수업에 활용한 실험집단으로 나누어 개념검사지를 통한 학생들의 화산 개념의 성취도 분석 및 개념도 수업 전략의 활동에 따른 정량적, 정성적 분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 전통적인 수업을 받은 집단과 개념도를 수업에 이용한 집단 사이의 성취도 평가에 유의미한 차이가 있는 것으로 나타나 개념도를 활용한 수업이 효과적임을 보였다. 둘째, 수업 후 중 ${\cdot}$ 하위그룹간의 개념성취 수준에 있어서 통계적인 차이를 보이지 않았으나, 상 ${\cdot}$ 하, 상 ${\cdot}$ 중위 그룹은 통계적으로 유의미한 차이를 보였다. 즉, 개념도 수업이 상위그룹보다는 중 ${\cdot}$ 하위 그룹에게 보다 큰 효과가 있었다. 셋째, 개념도 수업이 진행됨에 따라 관계, 위계, 연관, 예의 범주에 있어서 교재 내용의 개념을 구조화하는데 학생들이 능숙해짐을 보였다.

• 한국콘텐츠학회지
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• 제16권1호
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• pp.14-19
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• 2018

• 한국콘텐츠학회지
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• 제17권1호
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• pp.23-26
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• 2019