• 제목/요약/키워드: fuzzy connected

검색결과 127건 처리시간 0.03초

Connected geodesic number of a fuzzy graph

  • Rehmani, Sameeha;Sunitha, M.S.
    • Annals of Fuzzy Mathematics and Informatics
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    • 제16권3호
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    • pp.301-316
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    • 2018
  • In this paper, the concept of connected geodesic number, $gn_c(G)$, of a fuzzy graph G is introduced and its limiting bounds are identified. It is proved that all extreme nodes of G and all cut-nodes of the underlying crisp graph $G^*$ belong to every connected geodesic cover of G. The connected geodesic number of complete fuzzy graphs, fuzzy cycles, fuzzy trees and of complete bipartite fuzzy graphs are obtained. It is proved that for any pair k, n of integers with $3{\leq}k{\leq}n$, there exists a connected fuzzy graph G : (V, ${\sigma}$, ${\mu}$) on n nodes such that $gn_c(G)=k$. Also, for any positive integers $2{\leq}a<b{\leq}c$, it is proved that there exists a connected fuzzy graph G : (V, ${\sigma}$, ${\mu}$) such that the geodesic number gn(G) = a and the connected geodesic number $gn_c(G)=b$.

FUZZY SET CONNECTED FUNCTIONS

  • Chae, G.I.;Thakur, S.S.;Malviya, R.
    • East Asian mathematical journal
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    • 제23권1호
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    • pp.103-110
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    • 2007
  • The purpose of this paper is to introduce the concept of fuzzy set connected functions and investigate their properties.

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γ-Connectedness in fuzzy topological spaces

  • Hanafy, I.M.
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • 제3권2호
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    • pp.258-261
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    • 2003
  • The aim of this paper is to introduce the concept $\gamma$-connectedness in fuzzy topological spaces. We also investigate some interre lations between this types of fuzzy connectedness together with the preservation properties under some types of fuzzy continuity. A comparison between some types of connectedness in fuzzy topological spaces is of interest.

ON FUZZY MAXIMAL, MINIMAL AND MEAN OPEN SETS

  • SWAMINATHAN, A.;SIVARAJA, S.
    • Journal of Applied and Pure Mathematics
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    • 제4권1_2호
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    • pp.79-84
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    • 2022
  • We have observed that there exist certain fuzzy topological spaces with no fuzzy minimal open sets. This observation motivates us to investigate fuzzy topological spaces with neither fuzzy minimal open sets nor fuzzy maximal open sets. We have observed if such fuzzy topological spaces exist and if it is connected are not fuzzy cut-point spaces. We also study and characterize certain properties of fuzzy mean open sets in fuzzy T1-connected fuzzy topological spaces.

[ $G_{\delta}$ ]-CONNECTEDNESS AND $G_{\delta}$-DISCONNECTEDNESS IN FUZZY BITOPOLOGICAL SPACES

  • Roja, E.;Uma, M.K.;Balasubramanian, G.
    • East Asian mathematical journal
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    • 제23권2호
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    • pp.159-174
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    • 2007
  • In this paper, the concepts of pairwise fuzzy $G_{\delta}$-connected spaces and pairwise fuzzy $G_{\delta}$-extremally disconnected spaces are introduced. The concept of pairwise fuzzy $G_{\delta}$-basically disconnected spaces is defined. Characterizations of the above spaces are given besides giving several examples. Interrelations among the spaces introduced are discussed and some relevant counter examples are given.

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PSCAD/EMTDC를 이용한 계통연계형 태양광발전시스템의 MPPT제어를 위한 Double Fuzzy 제어기 설계에 관한 연구 (Maximum Power Point Tracking using Double Fuzzy Logic Controller for Grid-connected Photovoltaic System)

  • 김규한;김형수;박준호
    • 전기학회논문지
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    • 제60권3호
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    • pp.471-478
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    • 2011
  • This paper proposes a method of maximum power point tracking (MPPT) using fuzzy logic control for grid-connected photovoltaic systems (PV). First, for the purpose of comparison, because of its proven and good performances, the incremental conductance (IncCond) technique is briefly introduced. A double fuzzy logic controller (DFLC) based MPPT is then proposed which has shown better performances compared to the IncCond MPPT based approach. Modeling and Simulation in grid-connected PV system results are provided for both controllers under same atmospheric condition based PSCAD/EMTDC. The double fuzzy logic MPPT controller is then simulated and evaluated, which has shown better performances.

ON FUZZY ALMOST S-CONTINUOUS FUNCTIONS

  • Cho, Sung Ki
    • Korean Journal of Mathematics
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    • 제4권2호
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    • pp.95-100
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    • 1996
  • In this note, the notion of fuzzy almost s-continuity is introduced and some results related to this notion are obtained.

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뉴로-퍼지 제어기를 이용한 계통연계형 풍력발전 시스템의 센서리스 MPPT 제어 (Sensorless MPPT Control of a Grid-Connected Wind Power System Using a Neuro-Fuzzy Controller)

  • 이현희;최대근;이교범
    • 전력전자학회논문지
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    • 제16권5호
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    • pp.484-493
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    • 2011
  • 본 논문은 뉴로-퍼지 제어기를 이용한 최적의 퍼지 소속함수에 동조하는 다층 신경회로망을 사용한 성능이 개선된 MPPT 알고리즘을 제안한다. 퍼지 제어기의 성능은 퍼지규칙과 퍼지 소속함수의 폭의 영향을 받는다. 뉴로-퍼지 제어기는 신경망 학습을 통해 퍼지 소속함수의 최적 폭을 이용하기 때문에 기존 퍼지 제어기보다 우수한 응답특성을 갖는다. 실험과 시뮬레이션 결과를 통해 제안된 알고리즘의 우수한 제어특성을 확인한다.