2018-10-24T09:19:57Z
http://ijfs.usb.ac.ir/?_action=export&rf=summon&issue=68
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
Cover Vol.5, No.2, June 2008
2008
06
30
0
http://ijfs.usb.ac.ir/article_2903_b1e8b83ab19de88be3a860a02e7e1cbb.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
ESTIMATING THE PARAMETERS OF A FUZZY LINEAR
REGRESSION MODEL
A. R.
Arabpour
M.
Tata
Fuzzy linear regression models are used to obtain an appropriate
linear relation between a dependent variable and several independent variables
in a fuzzy environment. Several methods for evaluating fuzzy coefficients in
linear regression models have been proposed. The first attempts at estimating
the parameters of a fuzzy regression model used mathematical programming
methods. In this thesis, we generalize the metric defined by Diamond and
use it as a criterion to estimate these parameters. Our method, is not only
computationally easy to handle, but, when compared with earlier methods,
has a smaller the sum of errors of estimation.
Fuzzy linear regression
Least squares method
Estimate
2008
06
08
1
19
http://ijfs.usb.ac.ir/article_322_89ab18dcd4fa63d8116aaf289ebdb6b0.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
GENERATING FUZZY RULES FOR PROTEIN CLASSIFICATION
EGHBAL
G. MANSOORI
MANSOOR J.
ZOLGHADRI
SERAJ D.
KATEBI
HASSAN
MOHABATKAR
REZA
BOOSTANI
MOHAMMAD H.
SADREDDINI
This paper considers the generation of some interpretable fuzzy rules for assigning an amino acid sequence into the appropriate protein superfamily. Since the main objective of this classifier is the interpretability of rules, we have used the distribution of amino acids in the sequences of proteins as features. These features are the occurrence probabilities of six exchange groups in the sequences. To generate the fuzzy rules, we have used some modified versions of a common approach. The generated rules are simple and understandable, especially for biologists. To evaluate our fuzzy classifiers, we have used four protein superfamilies from UniProt database. Experimental results show the comprehensibility of generated fuzzy rules with comparable classification accuracy.
Amino acid sequence
Protein classification
Fuzzy rule-based classifier
2008
06
08
21
33
http://ijfs.usb.ac.ir/article_325_c5e79ee9562ba9d7cc118a49b9ada1c0.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
ON ( $alpha, beta$ )-FUZZY Hv-IDEALS OF H_{v}-RINGS
B.
Davvaz
P.
Corsini
Using the notion of “belongingness ($epsilon$)” and “quasi-coincidence
(q)” of fuzzy points with fuzzy sets, we introduce the concept of an ($ alpha, beta$)-
fuzzyHv-ideal of an Hv-ring, where , are any two of {$epsilon$, q,$epsilon$ $vee$ q, $epsilon$ $wedge$ q} with
$ alpha$ $neq$ $epsilon$ $wedge$ q. Since the concept of ($epsilon$, $epsilon$ $vee$ q)-fuzzy Hv-ideals is an important and
useful generalization of ordinary fuzzy Hv-ideals, we discuss some fundamental
aspects of ($epsilon$, $epsilon$ $vee$ q)-fuzzy Hv-ideals. A fuzzy subset A of an Hv-ring R is an
($epsilon$, $epsilon$ $vee$ q)-fuzzy Hv-ideal if and only if an At, level cut of A, is an Hv-ideal
of R, for all t$epsilon$(0, 0.5]. This shows that an($epsilon$, $epsilon$ $vee$ q)-fuzzy Hv-ideal is a
generalization of the existing concept of fuzzy Hv-ideal. Finally, we extend
the concept of a fuzzy subgroup with thresholds to the concept of a fuzzy
H_{v}-ideal with thresholds.
Hyperstructure
H_{v}-ring
Fuzzy set
Fuzzy H_{v}-ideal
2008
06
08
35
47
http://ijfs.usb.ac.ir/article_331_7ce6dea60021dc9f6ab1487b3ea00cf9.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
A COMMON FIXED POINT THEOREM FOR SIX WEAKLY
COMPATIBLE MAPPINGS IN M-FUZZY METRIC SPACES
Shaban
Sedghi
K. P. R.
Rao
Nabi
Shobe
In this paper, we give some new definitions of M-fuzzy metric spaces and we prove a common fixed point theorem for six mappings under the condition of weakly compatible mappings in complete M-fuzzy metric spaces.
M-fuzzy metric spaces
Weakly compatible maps
Hadzic-type t-norm
Common fixed point theorem
2008
06
08
49
62
http://ijfs.usb.ac.ir/article_333_8ac38854328cccd8f1a4b2688d0453bc.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
REDEFINED FUZZY SUBALGEBRAS OF BCK/BCI-ALGEBRAS
Arsham
Borumand Saeid
Y. B.
Jun
Using the notion of anti fuzzy points and its besideness to and nonquasi-coincidence with a fuzzy set, new concepts in anti fuzzy subalgebras in BCK/BCI-algebras are introduced and their properties and relationships are investigated.
Besides to
Non-quasi coincident with
($alpha
beta$)^{*}-fuzzy subalgebra
2008
06
08
63
70
http://ijfs.usb.ac.ir/article_334_806c0d3571ea942aae4f0a7501f33fe5.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
MODULARITY OF AJMAL FOR THE LATTICES OF FUZZY IDEALS
OF A RING
IFFAT
JAHAN
In this paper, we construct two fuzzy sets using the notions of level subsets and strong level subsets of a given fuzzy set in a ring R. These fuzzy sets turn out to be identical and provide a universal construction of a fuzzy ideal generated by a given fuzzy set in a ring. Using this construction and employing the technique of strong level subsets, we provide the shortest and direct fuzzy set theoretic proof of the fact that the lattice $vartheta$(R) of all fuzzy ideals of a ring R is modular.
Algebra
Lattice
Modularity
Ideal of a ring
Morphism
2008
06
08
71
78
http://ijfs.usb.ac.ir/article_335_d77ea108880da9b02b705e6c27df1d4f.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
A NEW NOTION OF FUZZY PS-COMPACTNESS
Shi-Zhong
Bai
In this paper, using pre-semi-open L-sets and their inequality, a new notion of PS-compactness is introduced in L-topological spaces, where L is a complete De Morgan algebra. This notion does not depend on the structure of the basis lattice L and L does not need any distributivity.
L-topology
Pre-semi-open L-set
Compactness
PS-compactness
2008
06
08
79
86
http://ijfs.usb.ac.ir/article_336_43f0e2d4affed0974ee3c15224348666.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
FUZZY SEMI-IDEAL AND GENERALIZED FUZZY QUOTIENT RING
YAO
BINGXUE
The concepts of fuzzy semi-ideals of R with respect to H≤R and generalized fuzzy quotient rings are introduced. Some properties of fuzzy semiideals are discussed. Finally, several isomorphism theorems for generalized fuzzy quotient rings are established.
Fuzzy Semi-ideal
Generalized Fuzzy Quotient Ring
Homomorphism
Isomorphism
2008
06
08
87
92
http://ijfs.usb.ac.ir/article_337_1025373edc6782ededb183dc98929799.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
t-BEST APPROXIMATION IN FUZZY NORMED SPACES
S. M.
Vaezpour
F.
Karimi
The main purpose of this paper is to find t-best approximations in fuzzy normed spaces. We introduce the notions of t-proximinal sets and F-approximations and prove some interesting theorems. In particular, we investigate the set of all t-best approximations to an element from a set.
Fuzzy normed space
t-best approximation
t-proximinal set
2008
06
08
93
99
http://ijfs.usb.ac.ir/article_338_cd7551ba57400b6f1b81b832dafed611.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2008
5
2
Persian-translation Vol.5, No.2, June 2008
2008
06
30
103
111
http://ijfs.usb.ac.ir/article_2904_09698e782b4a3f1128cab8182d0d7920.pdf