Cove Vol.5, No.3, October 2008
text
article
2008
eng
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
0
http://ijfs.usb.ac.ir/article_2901_670fd9d88f16069bbcbb60c0052e20bf.pdf
dx.doi.org/10.22111/ijfs.2008.2901
OPTIMIZATION OF FUZZY CLUSTERING CRITERIA BY A HYBRID
PSO AND FUZZY C-MEANS CLUSTERING ALGORITHM
E.
MEHDIZADEH
DEPARTMENT OF INDUSTRIAL ENGINEERING, SCIENCE & RESEARCH BRANCH,
ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
author
S.
SADI-NEZHAD
DEPARTMENT OF INDUSTRIAL ENGINEERING, SCIENCE & RESEARCH BRANCH,
ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
author
R.
TAVAKKOLI-MOGHADDAM
DEPARTMENT OF INDUSTRIAL ENGINEERING, COLLEGE OF
ENGINEERING, UNIVERSITY OF TEHRAN, TEHRAN, IRAN
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
1
14
http://ijfs.usb.ac.ir/article_339_3fd4baa8d09bbcf87e9f15a5e6ec363b.pdf
dx.doi.org/10.22111/ijfs.2008.339
SOLVING FUZZY LINEAR SYSTEMS BY USING THE SCHUR
COMPLEMENT WHEN COEFFICIENT MATRIX IS AN
M-MATRIX
M. S.
Hashemi
Department of Applied Mathematics,
Faculty of Mathematical Science, University of Tabriz, Tabriz-Iran
author
M. K.
Mirnia
Department of Applied Mathematics,
Faculty of Mathematical Science, University of Tabriz, Tabriz-Iran
author
S.
Shahmorad
Department of Applied Mathematics,
Faculty of Mathematical Science, University of Tabriz, Tabriz-Iran
author
text
article
2008
eng
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}.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
15
29
http://ijfs.usb.ac.ir/article_340_45018795472748406c9f0737e0cd837f.pdf
dx.doi.org/10.22111/ijfs.2008.340
ALMOST S^{*}-COMPACTNESS IN L-TOPOLOGICAL SPACES
Guo-Feng
Wen
School of Management Science and Engineering, Shandong Institute
of Business and Technology, Yantai 264005, P. R. China
author
Fu-Gui
Shi
Department of Mathematics, Beijing Institute of Technology, Beijing,100081,
P. R. China
author
Hong-Yan
Li
School of Mathematics and Information Science, Shandong Institute
of Business and Technology, Yantai 264005, P. R. China
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
31
44
http://ijfs.usb.ac.ir/article_344_38806068a065c4d5b10248627da60caa.pdf
dx.doi.org/10.22111/ijfs.2008.344
FUZZY ROUGH N-ARY SUBHYPERGROUPS
Violeta Leoreanu
Fotea
Faculty of Mathematics, ”Al.I. Cuza” University, Street
Carol I, n.11, Iasi, Romania
author
text
article
2008
eng
Fuzzy rough n-ary subhypergroups are introduced and characterized.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
45
56
http://ijfs.usb.ac.ir/article_345_9c9774448c11be68582d02c4034ba721.pdf
dx.doi.org/10.22111/ijfs.2008.345
BEST APPROXIMATION SETS IN -n-NORMED SPACE
CORRESPONDING TO INTUITIONISTIC FUZZY n-NORMED
LINEAR SPACE
S.
Vijayabalaji
Department of Mathematics, Anna University, Tiruchirappallli,
Panruti Campus, Tamilnadu, India
author
N.
Thillaigovindan
Department of Mathematics, Annamalai university, Annamalainagar-
608002, Tamilnadu, India
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
57
69
http://ijfs.usb.ac.ir/article_346_6ab0231a438fcfe753f8e98b207a377c.pdf
dx.doi.org/10.22111/ijfs.2008.346
METACOMPACTNESS IN L-TOPOLOGICAL SPACES
Sunil
Jacob John
Department of Mathematics, National Institute of Technology
Calicut, Calicut-673601, Kerala, India
author
T.
Baiju
Department of Mathematics, National Institute of Technology Calicut,
Calicut-673601, Kerala, India
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
71
79
http://ijfs.usb.ac.ir/article_348_6213cfdd88862a790fbc012919f842d6.pdf
dx.doi.org/10.22111/ijfs.2008.348
INTUITIONISTIC FUZZY QUASI-METRIC AND PSEUDO-METRIC SPACES
Yongfa
Hong
College of Information Science and Engineering, Shandong University
of Science and Technology, Qingdao, Shandong, 266510, P. R. China
author
Xianwen
Fang
Department of Mathematics and Physics, Anhui University of Science
and Technology, Huainan,Anhui, 232001, P. R. China
author
Binguo
Wang
College of Information Science and Engineering, Shandong University
of Science and Technology, Qingdao, Shandong, 266510, P. R. China
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
81
88
http://ijfs.usb.ac.ir/article_349_e462bdee3462b5203d0b7af5bdba624c.pdf
dx.doi.org/10.22111/ijfs.2008.349
THE DIRECT AND THE INVERSE LIMIT OF HYPERSTRUCTURES ASSOCIATED WITH FUZZY SETS OF TYPE 2
Violeta Leoreanu
Fotea
Faculty of Mathematics, ”Al.I.Cuza” University, 6600 Iasi,
Romania
author
text
article
2008
eng
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.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
89
94
http://ijfs.usb.ac.ir/article_350_9c19173a4d46068588b174898d965fc8.pdf
dx.doi.org/10.22111/ijfs.2008.350
Persian-translation Vol.5, No.3, October 2008
text
article
2008
eng
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
5
v.
3
no.
2008
97
104
http://ijfs.usb.ac.ir/article_2902_081e1c7c112e536df36567ef09aa9840.pdf
dx.doi.org/10.22111/ijfs.2008.2902