eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-29
3
2
0
10.22111/ijfs.2006.2914
2914
Cover Vol.3 No.2, October 2006
http://ijfs.usb.ac.ir/article_2914_aa82ef8226d37ef7b48868b10443ad5d.pdf
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-20
3
2
1
19
10.22111/ijfs.2006.451
451
مقاله پژوهشی
Fuzzy sets form A meta-system-theoretic point of view
Amir Daneshgar
daneshgar@sharif.ir
1
Amir Hashemi
2
http://ijfs.usb.ac.ir/article_451_685c7ee8c6f45c37d1aaa5acd967dfda.pdf
L-fuzzu sets
Enriched category
I/O system theory
Morphological filtering
Translation invariant system
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-20
3
2
21
32
10.22111/ijfs.2006.452
452
مقاله پژوهشی
FUZZY OBSERVER DESIGN WITH n-SHIFT MULTIPLE KEY FOR CRYPTOGRAPHY BASED ON 3D HYPERCHAOTIC OSCILLATOR
V. NATARAJAN
natraj@mitindia.edu
1
P. KANAGASABAPATHY
pks@mail.mitindia.edu
2
N. SELVAGANESAN
n_selvag@rediffmail.com
3
P. NATARAJAN
4
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA
DEPARTMENT OF EEE, PONDICHERRY ENGINEERING COLLEGE, PONDICHERRY- 605014, INDIA
DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA
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_424075805b1976f552dabf7c5c35d372.pdf
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-20
3
2
33
51
10.22111/ijfs.2006.453
453
مقاله پژوهشی
DIRECT ADAPTIVE FUZZY PI SLIDING MODE CONTROL OF SYSTEMS
WITH UNKNOWN BUT BOUNDED DISTURBANCES
MOHAMMAD-REZA AKBARZADEH-TOTONCHI
akbarzadeh@ieee.org
1
REZA SHAHNAZI
shahnazi@ieee.org
2
DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE OF ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN
DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE OF ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN
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.
http://ijfs.usb.ac.ir/article_453_298e3d12a051cfd3b73c004c5792a918.pdf
Nonlinear control
Fuzzy logic
Sliding mode control
Uncertainty
External
disturbances
Duffing forced-oscillation
Adaptive PI control
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-21
3
2
53
62
10.22111/ijfs.2006.462
462
مقاله پژوهشی
SEMI $theta$-COMPACTNESS IN INTUITIONISTIC FUZZY TOPOLOGICAL SPACES
I. M. Hanafy
ihanafy@hotmail.com
1
A. M. Abd El-Aziz
2
T. M. Salman
tarek00−salman@hotmail.com,tarek69salman@yahoo.com
3
Department of Mathematics, Al-Arish Faculty of Education, Al-Arish, Egypt.
Department of Mathematics, Al-Arish Faculty of Education, Al-Arish, Egypt.
Department of Mathematics, Al-Arish Faculty of Education, Al-Arish, Egypt.
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_d51233b4f1c9889edb5f6eaf56e94c63.pdf
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-21
3
2
63
73
10.22111/ijfs.2006.467
467
مقاله پژوهشی
INTERVAL-VALUED FUZZY B-ALGEBRAS
Arsham Borumand Saeid
arsham@iauk.ac.ir
1
Dept. of Mathematics, Islamic Azad University, Kerman Branch, Kerman, Iran
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_8d60975e2e2d849868fe833f3a6244d5.pdf
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-21
3
2
75
91
10.22111/ijfs.2006.469
469
مقاله پژوهشی
FUZZY SUBGROUPS AND CERTAIN EQUIVALENCE RELATIONS
APARNA JAIN
jainaparna@yahoo.com
1
DEPARTMENT OF MATHEMATICS, SHIVAJI COLLEGE, UNIVERSITY OF DELHI, NEW DELHI, INDIA
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.
http://ijfs.usb.ac.ir/article_469_c2215f9b01a891631d13665680641fbf.pdf
Fuzzy subgroup
Equivalence relation
Lattice
$alpha$– cut
Strong $alpha$– cut
Homomorphism
eng
University of Sistan and Baluchestan
Iranian Journal of Fuzzy Systems
1735-0654
1735-0654
2006-10-29
3
2
95
100
10.22111/ijfs.2006.2915
2915
Persian-translation Vol.3 No.2, October 2006
http://ijfs.usb.ac.ir/article_2915_641885b9def2867e23fa22368603d283.pdf