University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
29
Cover Vol.3 No.2, October 2006
0
EN
10.22111/ijfs.2006.2914
http://ijfs.usb.ac.ir/article_2914.html
http://ijfs.usb.ac.ir/article_2914_aa82ef8226d37ef7b48868b10443ad5d.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
20
Fuzzy sets form A meta-system-theoretic point of view
1
19
EN
Amir
Daneshgar
daneshgar@sharif.ir
Amir
Hashemi
10.22111/ijfs.2006.451
L-fuzzu sets,Enriched category,I/O system theory,Morphological filtering,Translation invariant system
http://ijfs.usb.ac.ir/article_451.html
http://ijfs.usb.ac.ir/article_451_685c7ee8c6f45c37d1aaa5acd967dfda.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
20
FUZZY OBSERVER DESIGN WITH n-SHIFT MULTIPLE KEY FOR CRYPTOGRAPHY BASED ON 3D HYPERCHAOTIC OSCILLATOR
21
32
EN
V.
NATARAJAN
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY,
CHROMEPET, CHENNAL-600044, INDIA
natraj@mitindia.edu
P.
KANAGASABAPATHY
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA
UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA
pks@mail.mitindia.edu
N.
SELVAGANESAN
DEPARTMENT OF EEE, PONDICHERRY ENGINEERING COLLEGE, PONDICHERRY-
605014, INDIA
n_selvag@rediffmail.com
P.
NATARAJAN
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY,
CHROMEPET, CHENNAL-600044, INDIA
10.22111/ijfs.2006.452
A fuzzy observer based scheme for synchronizing two hyperchaoticoscillators via a scalar transmitted signal for cryptographic application isproposed. The Takagi-Sugeno fuzzy model exactly represents chaotic systems.Based on the general fuzzy model, the fuzzy observer of a chaotic system isdesigned on the basis of the n-shift multiple state based key encryption algorithm.The scalar transmitted signal is designed in such a way that the hyperchaoticcarrier masks the encrypted signal, which in turn hides the message signal.Simulation results show that the proposed scheme gives a better performanceeven when a small additive stochastic noise is present in the channel.
http://ijfs.usb.ac.ir/article_452.html
http://ijfs.usb.ac.ir/article_452_424075805b1976f552dabf7c5c35d372.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
20
DIRECT ADAPTIVE FUZZY PI SLIDING MODE CONTROL OF SYSTEMS
WITH UNKNOWN BUT BOUNDED DISTURBANCES
33
51
EN
MOHAMMAD-REZA
AKBARZADEH-TOTONCHI
DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE
OF ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN
akbarzadeh@ieee.org
REZA
SHAHNAZI
DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE OF ENGINEERING, FERDOWSI
UNIVERSITY OF MASHHAD, MASHHAD, IRAN
shahnazi@ieee.org
10.22111/ijfs.2006.453
An asymptotically stable direct adaptive fuzzy PI sliding modecontroller is proposed for a class of nonlinear uncertain systems. In contrast toother existing approaches of handling disturbances, the proposed approachdoes not require this bound to be known, only requiring that it exists.Moreover, a PI control structure is used to attenuate chattering. The approachis applied to stabilize an open-loop unstable nonlinear system as well asthe Duffing forced-oscillation chaotic nonlinear system amid significantdisturbances. Analysis of simulations reveals the effectiveness of the proposedmethod in terms of a significant reduction in chattering while maintainingasymptotic convergence.
Nonlinear control,fuzzy logic,Sliding mode control,Uncertainty,External
disturbances,Duffing forced-oscillation,Adaptive PI control
http://ijfs.usb.ac.ir/article_453.html
http://ijfs.usb.ac.ir/article_453_298e3d12a051cfd3b73c004c5792a918.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
21
SEMI $theta$-COMPACTNESS IN INTUITIONISTIC FUZZY TOPOLOGICAL SPACES
53
62
EN
I. M.
Hanafy
Department of Mathematics,
Al-Arish Faculty of Education, Al-Arish, Egypt.
ihanafy@hotmail.com
A. M.
Abd El-Aziz
Department of Mathematics,
Al-Arish Faculty of Education, Al-Arish, Egypt.
T. M.
Salman
Department of Mathematics,
Al-Arish Faculty of Education, Al-Arish, Egypt.
tarek00−salman@hotmail.com,tarek69salman@yahoo.com
10.22111/ijfs.2006.462
The purpose of this paper is to construct the concept of semi$theta$-compactness in intuitionistic fuzzy topological spaces. We give some characterizationsof semi $theta$-compactness and locally semi -compactness. Also, wecompare these concepts with some other types of compactness in intuitionisticfuzzy topological spaces.
http://ijfs.usb.ac.ir/article_462.html
http://ijfs.usb.ac.ir/article_462_d51233b4f1c9889edb5f6eaf56e94c63.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
21
INTERVAL-VALUED FUZZY B-ALGEBRAS
63
73
EN
Arsham
Borumand Saeid
Dept. of Mathematics, Islamic Azad University, Kerman
Branch, Kerman, Iran
arsham@iauk.ac.ir
10.22111/ijfs.2006.467
In this note the notion of interval-valued fuzzy B-algebras (briefly,i-v fuzzy B-algebras), the level and strong level B-subalgebra is introduced.Then we state and prove some theorems which determine the relationshipbetween these notions and B-subalgebras. The images and inverse images ofi-v fuzzy B-subalgebras are defined, and how the homomorphic images andinverse images of i-v fuzzy B-subalgebra becomes i-v fuzzy B-algebras arestudied.
http://ijfs.usb.ac.ir/article_467.html
http://ijfs.usb.ac.ir/article_467_8d60975e2e2d849868fe833f3a6244d5.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
21
FUZZY SUBGROUPS AND CERTAIN EQUIVALENCE RELATIONS
75
91
EN
APARNA
JAIN
DEPARTMENT OF MATHEMATICS, SHIVAJI COLLEGE, UNIVERSITY OF DELHI, NEW DELHI,
INDIA
jainaparna@yahoo.com
10.22111/ijfs.2006.469
In this paper, we study an equivalence relation on the set of fuzzysubgroups of an arbitrary group G and give four equivalent conditions each ofwhich characterizes this relation. We demonstrate that with this equivalencerelation each equivalence class constitutes a lattice under the ordering of fuzzy setinclusion. Moreover, we study the behavior of these equivalence classes under theaction of a group homomorphism.
Fuzzy subgroup,Equivalence relation,Lattice,$alpha$– cut,Strong $alpha$– cut,Homomorphism
http://ijfs.usb.ac.ir/article_469.html
http://ijfs.usb.ac.ir/article_469_c2215f9b01a891631d13665680641fbf.pdf
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
3
2
2006
10
29
Persian-translation Vol.3 No.2, October 2006
95
100
EN
10.22111/ijfs.2006.2915
http://ijfs.usb.ac.ir/article_2915.html
http://ijfs.usb.ac.ir/article_2915_641885b9def2867e23fa22368603d283.pdf