2018-02-25T17:08:50Z
http://ijfs.usb.ac.ir/?_action=export&rf=summon&issue=58
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
Cover vol.8,no.1- February 2011
2011
03
02
0
http://ijfs.usb.ac.ir/article_2874_b146a1210c1b6737839b7a108b742ce0.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
FUZZY LOGISTIC REGRESSION: A NEW POSSIBILISTIC
MODEL AND ITS APPLICATION IN
CLINICAL VAGUE STATUS
Saeedeh
Pourahmad
S. Mohammad
Taghi Ayatollahi
S. Mahmoud
Taheri
Logistic regression models are frequently used in clinicalresearch and particularly for modeling disease status and patientsurvival. In practice, clinical studies have several limitationsFor instance, in the study of rare diseases or due ethical considerations, we can only have small sample sizes. In addition, the lack of suitable andadvanced measuring instruments lead to non-precise observations and disagreements among scientists in defining diseasecriteria have led to vague diagnosis. Also,specialists oftenreport their opinion in linguistic terms rather than numerically. Usually, because of these limitations, the assumptions of the statistical model do not hold and hence their use is questionable. We therefore need to develop new methods formodeling and analyzing the problem. In this study, a model called the `` fuzzy logistic model '' isproposed for the case when the explanatory variables arecrisp and the value of the binary response variable is reportedas a number between zero and one (indicating the possibility ofhaving the property). In this regard, the concept of `` possibilistic odds '' is alsointroduced. Then, the methodology and formulationof this model is explained in detail and a linear programming approach is use to estimate the model parameters. Some goodness-of-fit criteria are proposed and a numerical example is given as an example.
Logistic Regression
Clinical research
Fuzzy logistic regression
Possibilistic
odds
2011
02
11
1
17
http://ijfs.usb.ac.ir/article_232_ab7ae3d9f840627e8888c9450131cbb6.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
TOWARDS THE THEORY OF L-BORNOLOGICAL SPACES
mati
Abel
aleksandrs
ˇSostaks
The concept of an $L$-bornology is introduced and the theory of $L$-bornological spacesis being developed. In particular the lattice of all $L$-bornologies on a given set is studied and basic properties ofthe category of $L$-bornological spaces and bounded mappings are investigated.
Bornology
$L$-set
$L$-bornology
Fuzzy set
Fuzzy topology
2011
02
11
19
28
http://ijfs.usb.ac.ir/article_233_1ad45ef27bcc863221cb4c71a4ff9e4b.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
ORDERED INTUITIONISTIC FUZZY SOFT
MODEL OF FLOOD ALARM
Sunny Joseph
Kalayathankal
G. Suresh
Singh
P. B.
Vinodkumar
Sabu
Joseph
Jobin
Thomas
A flood warning system is a non-structural measure for flood mitigation. Several parameters are responsible for flood related disasters. This work illustrates an ordered intuitionistic fuzzy analysis that has the capability to simulate the unknown relations between a set of meteorological and hydrological parameters. In this paper, we first define ordered intuitionistic fuzzy soft sets and establish some results on them. Then, we define similarity measures between ordered intuitionistic fuzzy soft (OIFS) sets and apply these similarity measures to five selected sites of Kerala, India to predict potential flood.
rainfall
Intuitionistic fuzzy soft set
Flood
Simulation
2011
02
11
29
39
http://ijfs.usb.ac.ir/article_234_35cde19badb331cea8f2e50565ae547a.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
DISCRETE TOMOGRAPHY AND FUZZY INTEGER
PROGRAMMING
Fethi
Jarray
We study the problem of reconstructing binary images from four projections data in a fuzzy environment. Given the uncertainly projections,w e want to find a binary image that respects as best as possible these projections. We provide an iterative algorithm based on fuzzy integer programming and linear membership functions.
Discrete tomography
F uzzy integer programming
Image
reconstruction
2011
02
11
41
48
http://ijfs.usb.ac.ir/article_235_665d416a9509a1786df4be6c203977f0.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
MODIFIED K-STEP METHOD FOR SOLVING FUZZY INITIAL
VALUE PROBLEMS
Omid
Solaymani Fard
Ali
Vahidian Kamyad
We are concerned with the development of a K−step method for the numerical solution of fuzzy initial value problems. Convergence and stability of the method are also proved in detail. Moreover, a specific method of order 4 is found. The numerical results show that the proposed fourth order method is efficient for solving fuzzy differential equations.
Fuzzy numbers
Fuzzy differential equations
Modified k-step method
2011
02
11
49
63
http://ijfs.usb.ac.ir/article_236_a45147c5661d20b5db9030a06ea49fe5.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
On $n$-ary Hypergroups and Fuzzy $n$-ary Homomorphism
O.
Kazancı
S.
Yamak
B.
Davvaz
Hypergroup
$n$-ary hypergroup
Fuzzy set
$n$-ary sub-hypergroup
Fuzzy $n$-ary sub-hypergroup
$n$-ary homomorphism
2011
02
12
65
76
http://ijfs.usb.ac.ir/article_237_ea23a937b8bfe7d93a4e7c3e69a6bbc5.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
FUZZIFYING CLOSURE SYSTEMS AND CLOSURE
OPERATORS
Xiaoli
Luo
Jinming
Fang
In this paper, we propose the concepts of fuzzifying closure systems and Birkhoff fuzzifying closure operators. In the framework of fuzzifying mathematics, we find that there still exists a one to one correspondence between fuzzifying closure systems and Birkhoff fuzzifying closure operators as in the case of classical mathematics. In the aspect of category theory, we prove that the category of fuzzifying closure system spaces is isomorphic to the category of Birkhoff fuzzifying closure spaces. In addition, we obtain an important result that the category of fuzzifying closure spaces and that of fuzzifying closure system spaces can be both embedded in the category of Birkhoff 𝐼 -closure spaces. Finally, using fuzzifying closure systems of the paper, we introduce a set of separation axioms in fuzzifying closure system spaces, which offer a try how to research the properties of spaces by fuzzifying closure systems.
Fuzzifying closure operator
Fuzzifying closure system
Isomorphism
of categories
Embedding of categories
Fuzzifying remote neighborhood system
Separation axioms
2011
02
13
77
94
http://ijfs.usb.ac.ir/article_239_4b07e5de579748d34a7d4f9ffee36621.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
SEMISIMPLE SEMIHYPERGROUPS IN TERMS OF
HYPERIDEALS AND FUZZY HYPERIDEALS
Piergiulio
Corsini
Muhammad
Shabir
Tariq
Mahmood
In this paper, we define prime (semiprime) hyperideals and prime(semiprime) fuzzy hyperideals of semihypergroups. We characterize semihypergroupsin terms of their prime (semiprime) hyperideals and prime (semiprime)fuzzyh yperideals.
Semihypergroups
Prime (semiprime) hyperideals of semihypergroups
Prime (semiprime) fuzzy hyperideals of semihypergroups
Semisimple semihypergroups
2011
02
15
95
111
http://ijfs.usb.ac.ir/article_255_bb68e07ae3f0a44c6e035530baa661f9.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
SOME HYPER K-ALGEBRAIC STRUCTURES INDUCED BY
MAX-MIN GENERAL FUZZY AUTOMATA
khadijeh
Abolpour
Mohammad Mehdi
Zahedi
Masoome
Golmohamadian
We present some connections between the max-min general fuzzy automaton theory and the hyper structure theory. First, we introduce a hyper BCK-algebra induced by a max-min general fuzzy automaton. Then, we study the properties of this hyper BCK-algebra. Particularly, some theorems and results for hyper BCK-algebra are proved. For example, it is shown that this structure consists of different types of (positive implicative) commutative hyper K-ideals. As a generalization, we extend the definition of this hyper BCK-algebra to a bounded hyper K-algebra and obtain relative results.
(Positive implicative) Commutative hyper K-ideal
(Bounded) Hyper
BCK-algebra
Hyper BCK-ideal
Max-min general fuzzy automata
2011
02
16
113
134
http://ijfs.usb.ac.ir/article_256_71305226c332631bc2f1b6569fe5e508.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
NORM AND INNER PRODUCT ON FUZZY LINEAR SPACES
OVER FUZZY FIELDS
C. P.
Santhosh
T. V.
Ramakrishnan
In this paper, we introduce the concepts of norm and inner prod- uct on fuzzy linear spaces over fuzzy elds and discuss some fundamental properties.
Fuzzy fields
Fuzzy linear spaces
Norm on fuzzy linear spaces
Inner
product on fuzzy linear spaces
2011
02
16
135
144
http://ijfs.usb.ac.ir/article_257_86f80c9af851736ee66c2d110c3055f3.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
VAGUE RINGS AND VAGUE IDEALS
Sevda
Sezer
In this paper, various elementary properties of vague rings are obtained. Furthermore, the concepts of vague subring, vague ideal, vague prime ideal and vague maximal ideal are introduced, and the validity of some relevant classical results in these settings are investigated.
Vague group
Generalized vague subgroup
Vague ring
Vague subring
Vague ideal
Vague prime ideal
Vague maximal ideal
2011
02
16
145
157
http://ijfs.usb.ac.ir/article_258_c7c6d1457f353b46765c5eee7dd0ef9b.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2011
8
1
Persian-translation vol.8,no.1- February 2011
2011
03
02
161
171
http://ijfs.usb.ac.ir/article_2875_306b1941e5189f522993186d670bc66f.pdf