2018-02-25T17:10:03Z
http://ijfs.usb.ac.ir/?_action=export&rf=summon&issue=94
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
cover Vol. 2 No. 1
2005
04
27
0
http://ijfs.usb.ac.ir/article_3125_1c08b55268965943ac4cf510119ecfcf.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
SIMULATING CONTINUOUS FUZZY SYSTEMS: I
J. J.
Buckley
K. D.
Reilly
L. J.
Jowers
In previous studies we first concentrated on utilizing crisp simulationto produce discrete event fuzzy systems simulations. Then we extendedthis research to the simulation of continuous fuzzy systems models. In this paperwe continue our study of continuous fuzzy systems using crisp continuoussimulation. Consider a crisp continuous system whose evolution depends ondifferential equations. Such a system contains a number of parameters thatmust be estimated. Usually point estimates are computed and used in themodel. However these point estimates typically have uncertainty associatedwith them. We propose to incorporate uncertainty by using fuzzy numbers asestimates of these unknown parameters. Fuzzy parameters convert the crispsystem into a fuzzy system. Trajectories describing the behavior of the systembecome fuzzy curves. We will employ crisp continuous simulation to estimatethese fuzzy trajectories. Three examples are discussed.
Fuzzy systems
Fuzzy differential equations
Simulation
Uncertainty
2005
04
21
1
17
http://ijfs.usb.ac.ir/article_471_f3efc123c3db28ced3c6f896f470dbb4.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
ON PROJECTIVE L- MODULES
PAUL
ISAAC
The concepts of free modules, projective modules, injective modules and the likeform an important area in module theory. The notion of free fuzzy modules was introducedby Muganda as an extension of free modules in the fuzzy context. Zahedi and Ameriintroduced the concept of projective and injective L-modules. In this paper we give analternate definition for projective L-modules. We prove that every free L-module is aprojective L-module. Also we prove that if μ∈L(P) is a projective L-module, and if0→η f→ ν g→ μ →0 is a short exact sequence of L-modules then η⊕ μ >ν.Further it is proved that if μ∈L(P) is a projective L-module then μ is a fuzzy direct summandof a free L-module.
The concepts of free modules
projective modules
2005
04
21
19
28
http://ijfs.usb.ac.ir/article_472_56c5e05d4edd4ec42f09af2b28ca8488.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
P2-CONNECTEDNESS IN L-TOPOLOGICAL SPACES
Shu-Ping
Li
Zheng
Fang
Jie
Zhao
In this paper, a certain new connectedness of L-fuzzy subsets inL-topological spaces is introduced and studied by means of preclosed sets. Itpreserves some fundamental properties of connected set in general topology.Especially the famous K. Fan’s Theorem holds.
L-topological space
Preclosed set
P-connected set
P2-connected set
2005
04
21
29
36
http://ijfs.usb.ac.ir/article_473_a29f06f0f25e1ea6f87a2142260d85f3.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
FUZZY HYPERVECTOR SPACES OVER VALUED FIELDS
Reza
Ameri
In this note we first redefine the notion of a fuzzy hypervectorspace (see [1]) and then introduce some further concepts of fuzzy hypervectorspaces, such as fuzzy convex and balance fuzzy subsets in fuzzy hypervectorspaces over valued fields. Finally, we briefly discuss on the convex (balanced)hull of a given fuzzy set of a hypervector space.
Fuzzy hypervector spaces
convex fuzzy sets
balanced fuzzy sets
valued fields
2005
04
21
37
47
http://ijfs.usb.ac.ir/article_474_75629850ad65e93cb75b88dddde33b7f.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
CATEGORY OF (POM)L-FUZZY GRAPHS AND HYPERGRAPHS
M. M.
Zahedi
M. R.
Khorashadi-Zadeh
In this note by considering a complete lattice L, we define thenotion of an L-Fuzzy hyperrelation on a given non-empty set X. Then wedefine the concepts of (POM)L-Fuzzy graph, hypergraph and subhypergroupand obtain some related results. In particular we construct the categories ofthe above mentioned notions, and give a (full and faithful) functor form thecategory of (POM)L-Fuzzy subhypergroups ((POM)L-Fuzzy graphs) into thecategory of (POM)L-Fuzzy hypergraphs. Also we show that for each finiteobjects in the category of (POM)L-Fuzzy graphs, the coproduct exists, andunder a suitable condition the product also exists.
Fuzzy graph
Fuzzy hypergraph
Fuzzy subhypergroup
Partially
ordered monoid
2005
04
21
49
63
http://ijfs.usb.ac.ir/article_475_4c6e4e4c3721205d46bc60a79552b370.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
POTENTIAL ENERGY BASED STABILITY ANALYSIS OF FUZZY LINGUISTIC SYSTEMS
AMIR ABOLFAZL
SURATGAR
SYED KAMALEDIN
NIKRAVESH
This paper presents the basic concepts of stability in fuzzy linguistic models. Theauthors have proposed a criterion for BIBO stability analysis of fuzzy linguistic modelsassociated to linear time invariant systems [25]-[28]. This paper presents the basic concepts ofstability in the general nonlinear and linear systems. This stability analysis method is verifiedusing a benchmark system analysis.
Fuzzy modeling
Stability analysis
Necessary and sufficient condition for
stability
Potential energy
2005
04
21
65
74
http://ijfs.usb.ac.ir/article_476_864cf32d5a991972d992edcdd3b3cb6f.pdf
Iranian Journal of Fuzzy Systems
IJFS
1735-0654
1735-0654
2005
2
1
Persian-translation Vol. 2 No. 1
2005
04
28
77
82
http://ijfs.usb.ac.ir/article_3126_12ac9fce1f8b3a6aae2759c54c0a60db.pdf