• 제목/요약/키워드: fuzzy compact

검색결과 82건 처리시간 0.024초

The Concepts of Tightness for Fuzzy Set Valued Random Variables

  • Kim, Yun-Kyong
    • International Journal of Fuzzy Logic and Intelligent Systems
    • /
    • 제9권2호
    • /
    • pp.147-153
    • /
    • 2009
  • In this paper, we introduce several concepts of tightness for a sequence of random variables taking values in the space of normal and upper-semicontinuous fuzzy sets with compact support in $R^p$ and give some characterizations of their concepts. Also, counter-examples for the relationships between the concepts of tightness are given.

TIGHTNESS OF LEVEL-WISE CONTINUOUS FUZZY RANDOM VARIABLES

  • Joo, Sang-Yeol;Lee, Seung-Soo;Yoo, Young-Ho
    • Journal of the Korean Statistical Society
    • /
    • 제32권1호
    • /
    • pp.73-83
    • /
    • 2003
  • In this paper, we first obtain some characterizations of compact subsets of the space of level-wise continuous fuzzy numbers in R by the modulus of continuity. Using this, we establish the tightness for a sequence of level-wise continuous fuzzy random variables.

SOME RESULTS ON CONVERGENCE IN DISTRIBUTION FOR FUZZY RANDOM SETS

  • JOO SANG YEOL;CHOI GYEONG SUK;KWON JOONG SUNG;KIM YUN KYONG
    • 대한수학회지
    • /
    • 제42권1호
    • /
    • pp.171-189
    • /
    • 2005
  • In this paper, we first establish some characterization of tightness for a sequence of random elements taking values in the space of normal and upper-semicontinuous fuzzy sets with compact support in $R^P$. As a result, we give some sufficient conditions for a sequence of fuzzy random sets to converge in distribution.

ON FUZZY T2-AXIOMS AND FUZZY COMPACTNESS

  • Cho, Sung Ki;Chung, Dong Gweon
    • Korean Journal of Mathematics
    • /
    • 제6권2호
    • /
    • pp.155-164
    • /
    • 1998
  • In this paper, the fuzzy $T_2$-axioms due to Hutton and Reilly, Ganguly and Saha and Sinha are characterized by using the notion of fuzzy closure. As consequences, we study the relation between the fuzzy $T_2$-axioms and give some examples which show that the axiom of fuzzy compactness, due to Ganguly and Saha, is not compatible with the fuzzy $T_2$-axioms.

  • PDF

Weak laws of large numbers for weighted sums of Banach space valued fuzzy random variables

  • Kim, Yun Kyong
    • International Journal of Fuzzy Logic and Intelligent Systems
    • /
    • 제13권3호
    • /
    • pp.215-223
    • /
    • 2013
  • In this paper, we present some results on weak laws of large numbers for weighted sums of fuzzy random variables taking values in the space of normal and upper-semicontinuous fuzzy sets with compact support in a separable real Banach space. First, we give weak laws of large numbers for weighted sums of strong-compactly uniformly integrable fuzzy random variables. Then, we consider the case that the weighted averages of expectations of fuzzy random variables converge. Finally, weak laws of large numbers for weighted sums of strongly tight or identically distributed fuzzy random variables are obtained as corollaries.

Complex Fuzzy Logic Filter and Learning Algorithm

  • Lee, Ki-Yong;Lee, Joo-Hum
    • The Journal of the Acoustical Society of Korea
    • /
    • 제17권1E호
    • /
    • pp.36-43
    • /
    • 1998
  • A fuzzy logic filter is constructed from a set of fuzzy IF-THEN rules which change adaptively to minimize some criterion function as new information becomes available. This paper generalizes the fuzzy logic filter and it's adaptive filtering algorithm to include complex parameters and complex signals. Using the complex Stone-Weierstrass theorem, we prove that linear combinations of the fuzzy basis functions are capable of uniformly approximating and complex continuous function on a compact set to arbitrary accuracy. Based on the fuzzy basis function representations, a complex orthogonal least-squares (COLS) learning algorithm is developed for designing fuzzy systems based on given input-output pairs. Also, we propose an adaptive algorithm based on LMS which adjust simultaneously filter parameters and the parameter of the membership function which characterize the fuzzy concepts in the IF-THEN rules. The modeling of a nonlinear communications channel based on a complex fuzzy is used to demonstrate the effectiveness of these algorithm.

  • PDF

ON FUZZY BITOPOLOGICAL SPACES IN ŠOSTAK'S SENSE

  • Ramadan, A.A.;Abbas, S.E.;El-Latif, A.A. Abd
    • 대한수학회논문집
    • /
    • 제21권3호
    • /
    • pp.497-514
    • /
    • 2006
  • In this paper, we used the supra fuzzy topology which generated from a fuzzy bitopological space [1] to introduce and study the concepts of continuity (resp. openness, closeness) of mapping, separation axioms and compactness for a fuzzy bitopological spaces. Our definition preserve much of the correspondence between concepts of fuzzy bitopological spaces and the associated fuzzy topological spaces.

EXISTENCE THEOREMS FOR FIXED FUZZY POINTS WITH CLOSED α-CUT SETS IN COMPLETE METRIC SPACES

  • Cho, Yeol-Je;Petrot, Narin
    • 대한수학회논문집
    • /
    • 제26권1호
    • /
    • pp.115-124
    • /
    • 2011
  • In this paper, some fuzzy fixed point theorems for fuzzy mappings are established by considering the nonempty closed $\alpha$-cut sets. Some importance observations are also discussed. Our results clearly extend, generalize and improve the corresponding results in the literatures, which have given most of their attention to the class of fuzzy sets with nonempty compact or closed and bounded $\alpha$-cut sets.

퍼지 유사성 기반 슈퍼-픽셀 생성 (Super-Pixels Generation based on Fuzzy Similarity)

  • 김용길;문경일
    • 한국인터넷방송통신학회논문지
    • /
    • 제17권2호
    • /
    • pp.147-157
    • /
    • 2017
  • 최근에는 슈퍼-픽셀 (super-pixel)은 컴퓨터 발전 응용에 널리 사용되고 있다. 슈퍼 픽셀 알고리즘은 픽셀을 지각적으로 실행이 가능한 영역으로 변환하여 그리드 픽셀의 경직된 특징을 줄일 수 있다. 특히, 슈퍼 픽셀은 깊이 추정, 골격 작업, 바디 라벨링 및 기능 국소화 등에 사용된다. 그러나 이러한 작업을 수행하기 위해 우수한 슈퍼 픽셀 파티션을 생성하는 것은 쉽지 않다. 특히 슈퍼 픽셀은 비합, 지속, 폐쇄, 지각 불변과 같은 형태 측면을 고려할 때보다 의미있는 특징을 만족시키지는 못한다. 본 논문에서는 단순 선형 반복 클러스터링과 퍼지 클러스터링 개념을 결합한 고급 알고리즘을 제안한다. 단순 선형 반복 클러스터링 기술은 이미지 경계, 속도, 메모리 효율이 기존 방법보다 높다. 그것은 형태 측면의 맥락에서 슈퍼 픽셀 형태에 대해 양호하게 작거나 규칙적인 특성을 제안하는 것은 아니다. 퍼지 유사성 측정은 제한된 크기와 이웃을 고려하여 합리적인 그래프를 제공한다. 보다 작고 규칙적인 픽셀을 얻으며 부분적으로 관련된 특징을 추출 할 수 있다. 시뮬레이션은 퍼지 유사성 기반 슈퍼 픽셀 생성은 사람의 이미지를 분해하는 방식으로 자연적 특징을 대표적으로 나타낸다.

조건부에 시스템 입력만을 사용하는 계층 퍼지 시스템 (Hierarchical Fuzzy System with only system variables for IF-part)

  • 주문갑
    • 한국지능시스템학회논문지
    • /
    • 제14권2호
    • /
    • pp.178-183
    • /
    • 2004
  • 본 논문에서는 기존의 계층 퍼지 시스템에서 입력 변수로 사용되던 이전 계층의 출력값을 퍼지 규칙의 전건부에서는 사용하지 않고 후건부에서만 사용하는 계층 퍼지 시스템을 제안하였다. 또한 제안된 계층 퍼지 시스템을 구성할 때에 싱글톤 퍼지화기와 평균 중심법 비퍼지화기를 사용하는 경우에는 시스템 입력 변수의 멤버쉽 함수가 주어진 컴팩트 도메인 내에서 완전하기만 하다면, 임의의 연속 함수에 대하여 그에 해당하는 제안된 형태의 계층 퍼지 시스템이 존재한다는 것을 수학적으로 증명하였다.