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 Fuzzy sets form A meta-system-theoretic point of view 1 19 451 10.22111/ijfs.2006.451 EN Amir Daneshgar Amir Hashemi Journal Article 2006 07 20

https://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 FUZZY OBSERVER DESIGN WITH n-SHIFT MULTIPLE KEY FOR CRYPTOGRAPHY BASED ON 3D HYPERCHAOTIC OSCILLATOR 21 32 452 10.22111/ijfs.2006.452 EN V. NATARAJAN DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA P. KANAGASABAPATHY DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA N. SELVAGANESAN DEPARTMENT OF EEE, PONDICHERRY ENGINEERING COLLEGE, PONDICHERRY- 605014, INDIA P. NATARAJAN DEPARTMENT OF INSTRUMENTATION ENGINEERING, MIT CAMPUS, ANNA UNIVERSITY, CHROMEPET, CHENNAL-600044, INDIA Journal Article 2005 03 20 A fuzzy observer based scheme for synchronizing two hyperchaotic oscillators via a scalar transmitted signal for cryptographic application is proposed. The Takagi-Sugeno fuzzy model exactly represents chaotic systems. Based on the general fuzzy model, the fuzzy observer of a chaotic system is designed 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 hyperchaotic carrier masks the encrypted signal, which in turn hides the message signal. Simulation results show that the proposed scheme gives a better performance even when a small additive stochastic noise is present in the channel. https://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 DIRECT ADAPTIVE FUZZY PI SLIDING MODE CONTROL OF SYSTEMS WITH UNKNOWN BUT BOUNDED DISTURBANCES 33 51 453 10.22111/ijfs.2006.453 EN MOHAMMAD-REZA AKBARZADEH-TOTONCHI DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE OF ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN REZA SHAHNAZI DEPARTMENT OF ELECTRICAL ENGINEERING, COLLEGE OF ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN Journal Article 2005 08 20 An asymptotically stable direct adaptive fuzzy PI sliding mode controller is proposed for a class of nonlinear uncertain systems. In contrast to other existing approaches of handling disturbances, the proposed approach does not require this bound to be known, only requiring that it exists. Moreover, a PI control structure is used to attenuate chattering. The approach is applied to stabilize an open-loop unstable nonlinear system as well as the Duffing forced-oscillation chaotic nonlinear system amid significant disturbances. Analysis of simulations reveals the effectiveness of the proposed method in terms of a significant reduction in chattering while maintaining asymptotic convergence.

https://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 SEMI $\theta$-COMPACTNESS IN INTUITIONISTIC FUZZY TOPOLOGICAL SPACES 53 62 462 10.22111/ijfs.2006.462 EN I. M. Hanafy Department of Mathematics, Al-Arish Faculty of Education, Al-Arish, Egypt. 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. Journal Article 2005 03 21 The purpose of this paper is to construct the concept of semi $\theta$-compactness in intuitionistic fuzzy topological spaces. We give some characterizations of semi $\theta$-compactness and locally semi -compactness. Also, we compare these concepts with some other types of compactness in intuitionistic fuzzy topological spaces. https://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 INTERVAL-VALUED FUZZY B-ALGEBRAS 63 73 467 10.22111/ijfs.2006.467 EN Arsham Borumand Saeid Dept. of Mathematics, Islamic Azad University, Kerman Branch, Kerman, Iran Journal Article 2005 04 21 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 relationship between these notions and B-subalgebras. The images and inverse images of i-v fuzzy B-subalgebras are defined, and how the homomorphic images and inverse images of i-v fuzzy B-subalgebra becomes i-v fuzzy B-algebras are studied. https://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 FUZZY SUBGROUPS AND CERTAIN EQUIVALENCE RELATIONS 75 91 469 10.22111/ijfs.2006.469 EN APARNA JAIN DEPARTMENT OF MATHEMATICS, SHIVAJI COLLEGE, UNIVERSITY OF DELHI, NEW DELHI, INDIA Journal Article 2005 06 21 In this paper, we study an equivalence relation on the set of fuzzy subgroups of an arbitrary group G and give four equivalent conditions each of which characterizes this relation. We demonstrate that with this equivalence relation each equivalence class constitutes a lattice under the ordering of fuzzy set inclusion. Moreover, we study the behavior of these equivalence classes under the action of a group homomorphism.

https://ijfs.usb.ac.ir/article_469_c2215f9b01a891631d13665680641fbf.pdf