2017-11-21T22:29:46Z
http://ijfs.usb.ac.ir/?_action=export&rf=summon&issue=70
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
Cove Vol.5, No.3, October 2008
2008
10
29
0
http://ijfs.usb.ac.ir/article_2901_670fd9d88f16069bbcbb60c0052e20bf.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
OPTIMIZATION OF FUZZY CLUSTERING CRITERIA BY A HYBRID
PSO AND FUZZY C-MEANS CLUSTERING ALGORITHM
E.
MEHDIZADEH
S.
SADI-NEZHAD
R.
TAVAKKOLI-MOGHADDAM
This paper presents an efficient hybrid method, namely fuzzy particleswarm optimization (FPSO) and fuzzy c-means (FCM) algorithms, to solve the fuzzyclustering problem, especially for large sizes. When the problem becomes large, theFCM algorithm may result in uneven distribution of data, making it difficult to findan optimal solution in reasonable amount of time. The PSO algorithm does find agood or near-optimal solution in reasonable time, but we show that its performancemay be improved by seeding the initial swarm with the result of the c-meansalgorithm. Various clustering simulations are experimentally compared with the FCMalgorithm in order to illustrate the efficiency and ability of the proposed algorithms.
Fuzzy clustering
Particle Swarm Optimization (PSO)
Fuzzy
c-means (FCM)
2008
10
08
1
14
http://ijfs.usb.ac.ir/article_339_3fd4baa8d09bbcf87e9f15a5e6ec363b.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
SOLVING FUZZY LINEAR SYSTEMS BY USING THE SCHUR
COMPLEMENT WHEN COEFFICIENT MATRIX IS AN
M-MATRIX
M. S.
Hashemi
M. K.
Mirnia
S.
Shahmorad
This paper analyzes a linear system of equations when the righthandside is a fuzzy vector and the coefficient matrix is a crisp M-matrix. Thefuzzy linear system (FLS) is converted to the equivalent crisp system withcoefficient matrix of dimension 2n × 2n. However, solving this crisp system isdifficult for large n because of dimensionality problems . It is shown that thisdifficulty may be avoided by computing the inverse of an n×n matrix insteadof Z^{−1}.
Fuzzy linear system
Schur complement
M-matrix
H-matrix
2008
10
08
15
29
http://ijfs.usb.ac.ir/article_340_45018795472748406c9f0737e0cd837f.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
ALMOST S^{*}-COMPACTNESS IN L-TOPOLOGICAL SPACES
Guo-Feng
Wen
Fu-Gui
Shi
Hong-Yan
Li
In this paper, the notion of almost S^{*}-compactness in L-topologicalspaces is introduced following Shi’s definition of S^{*}-compactness. The propertiesof this notion are studied and the relationship between it and otherdefinitions of almost compactness are discussed. Several characterizations ofalmost S^{*}-compactness are also presented.
L-topology
$beta$_{a}-cover
Q_{a} -cover
S^{*}-compactness
Almost S^{*}-compactness
2008
10
09
31
44
http://ijfs.usb.ac.ir/article_344_38806068a065c4d5b10248627da60caa.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
FUZZY ROUGH N-ARY SUBHYPERGROUPS
Violeta Leoreanu
Fotea
Fuzzy rough n-ary subhypergroups are introduced and characterized.
Fuzzy rough n-ary subhypergroup
Fuzzy set
Rough set
n-ary subhypergroup
2008
10
09
45
56
http://ijfs.usb.ac.ir/article_345_9c9774448c11be68582d02c4034ba721.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
BEST APPROXIMATION SETS IN -n-NORMED SPACE
CORRESPONDING TO INTUITIONISTIC FUZZY n-NORMED
LINEAR SPACE
S.
Vijayabalaji
N.
Thillaigovindan
The aim of this paper is to present the new and interesting notionof ascending family of $alpha $−n-norms corresponding to an intuitionistic fuzzy nnormedlinear space. The notion of best aproximation sets in an $alpha $−n-normedspace corresponding to an intuitionistic fuzzy n-normed linear space is alsodefined and several related results are obtained.
Fuzzy n-normed linear space
intuitionistic fuzzy n-norm
Best approximation
sets
2008
10
09
57
69
http://ijfs.usb.ac.ir/article_346_6ab0231a438fcfe753f8e98b207a377c.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
METACOMPACTNESS IN L-TOPOLOGICAL SPACES
Sunil
Jacob John
T.
Baiju
In this paper the concept of metacompactness in L-topologicalspaces is introduced by means of point finite families of L-fuzzy sets. Thisfuzzy metacompactness is a natural generalization of Lowen fuzzy compactness.Further a characterization of fuzzy metacompactness in the weakly inducedL-topological spaces is also obtained.
L-topology
Fuzzy metacompactness
2008
10
09
71
79
http://ijfs.usb.ac.ir/article_348_6213cfdd88862a790fbc012919f842d6.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
INTUITIONISTIC FUZZY QUASI-METRIC AND PSEUDO-METRIC SPACES
Yongfa
Hong
Xianwen
Fang
Binguo
Wang
In this paper, we propose a new definition of intuitionistic fuzzyquasi-metric and pseudo-metric spaces based on intuitionistic fuzzy points. Weprove some properties of intuitionistic fuzzy quasi- metric and pseudo-metricspaces, and show that every intuitionistic fuzzy pseudo-metric space is intuitionisticfuzzy regular and intuitionistic fuzzy completely normal and henceintuitionistic fuzzy normal. These are the intuitionistic fuzzy generalization ofthe corresponding properties of fuzzy quasi-metric and pseudo- metric spaces.
Intuitionistic fuzzy quasi-metric spaces
Intuitionistic fuzzy pseudometric
spaces
2008
10
09
81
88
http://ijfs.usb.ac.ir/article_349_e462bdee3462b5203d0b7af5bdba624c.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
THE DIRECT AND THE INVERSE LIMIT OF HYPERSTRUCTURES ASSOCIATED WITH FUZZY SETS OF TYPE 2
Violeta Leoreanu
Fotea
In this paper we study two important concepts, i.e. the direct andthe inverse limit of hyperstructures associated with fuzzy sets of type 2, andshow that the direct and the inverse limit of hyperstructures associated withfuzzy sets of type 2 are also hyperstructures associated with fuzzy sets of type 2.
Hyperstructure
Hypergroup
Fuzzy set of type 2
Direct limit
Inverse
limit
2008
10
09
89
94
http://ijfs.usb.ac.ir/article_350_9c19173a4d46068588b174898d965fc8.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
3
Persian-translation Vol.5, No.3, October 2008
2008
10
30
97
104
http://ijfs.usb.ac.ir/article_2902_081e1c7c112e536df36567ef09aa9840.pdf