Cover Vol.6, No.1, Februery 2009
text
article
2009
eng
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
0
http://ijfs.usb.ac.ir/article_2899_64803482e5166a819fb1a57a0125543d.pdf
dx.doi.org/10.22111/ijfs.2009.2899
ROBUST $H_{\infty}$ CONTROL FOR T–S TIME-VARYING DELAY
SYSTEMS WITH NORM BOUNDED UNCERTAINTY BASED ON
LMI APPROACH
Han-Liang
Huang
Department of Mathematics, Beijing Institute of Technology,
Beijing 100081, China
author
Fu-Gui
Shi
Department of Mathematics, Beijing Institute of Technology, Beijing
100081, China
author
text
article
2009
eng
In this paper we consider the problem of delay-dependent robustH1 control for uncertain fuzzy systems with time-varying delay. The Takagi–Sugeno (T–S) fuzzy model is used to describe such systems. Time-delay isassumed to have lower and upper bounds. Based on the Lyapunov-Krasovskiifunctional method, a sufficient condition for the existence of a robust $H_{\infty}$controller is obtained. The fuzzy state feedback gains are derived by solvingpertinent LMIs. The proposed method can avoid restrictions on the derivativeof the time-varying delay assumed in previous works. The effectiveness of ourmethod is demonstrated by a numerical example.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
1
14
http://ijfs.usb.ac.ir/article_214_04d0cd9efac09c8afac5f1cebbedce64.pdf
dx.doi.org/10.22111/ijfs.2009.214
COMBINING FUZZY QUANTIFIERS AND NEAT OPERATORS
FOR SOFT COMPUTING
Ferenc
szidarovszky
Systems and Industrial Engineering Department, University of
Arizona, Tucson, Az 85721-0020, USA
author
Mahdi
Zarghami
Faculty of Civil Engineering, University of Tabriz, Tabriz 51664,
Iran
author
text
article
2009
eng
This paper will introduce a new method to obtain the order weightsof the Ordered Weighted Averaging (OWA) operator. We will first show therelation between fuzzy quantifiers and neat OWA operators and then offer anew combination of them. Fuzzy quantifiers are applied for soft computingin modeling the optimism degree of the decision maker. In using neat operators,the ordering of the inputs is not needed resulting in better computationefficiency. The theoretical results will be illustrated in a water resources managementproblem. This case study shows that more sensitive decisions areobtained by using the new method.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
15
25
http://ijfs.usb.ac.ir/article_216_718ace55bcfe8d8ebb8889beaac78deb.pdf
dx.doi.org/10.22111/ijfs.2009.216
THE PERCENTILES OF FUZZY NUMBERS AND THEIR
APPLICATIONS
Eynollah
Pasha
Department of Mathematics, The teacher Training University,
Tehran, Iran
author
Abolfazl
Saiedifar
Department of Statistics, Science and Research branch, Islamic
Azad University, Tehran 14515-775, Iran
author
Babak
Asady
Department of Mathematics, Islamic Azad University, Arak, Iran
author
text
article
2009
eng
The purpose of this study is to find the percentiles of fuzzy numbersand to demonstrate their applications, which include finding weightedmeans, dispersion indices, and the percentile intervals of fuzzy numbers. Thecrisp approximations of fuzzy numbers introduced in this paper are new andinteresting for the comparison of fuzzy environments, such as a variety of economic,financial, and engineering systems control problems.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
27
44
http://ijfs.usb.ac.ir/article_217_28963c5c70c04cbeae3128254ac46d54.pdf
dx.doi.org/10.22111/ijfs.2009.217
ABSORBENT ORDERED FILTERS AND THEIR
FUZZIFICATIONS IN IMPLICATIVE SEMIGROUPS
Young Bae
Jun
Department of Mathematics Education and (RINS), Gyeongsang National
University, Chinju 660-701, Korea
author
Chul Hwan
Park
Department of Mathematics, University of Ulsan, Ulsan 680-749,
Korea
author
D. R.
Prince Williams
Department of Information Technology, Salalah College of
Technology, Post Box: 608, Salalah-211, Sultanate of Oman
author
text
article
2009
eng
The notion of absorbent ordered filters in implicative semigroupsis introduced, and its fuzzification is considered. Relations among (fuzzy) orderedfilters, (fuzzy) absorbent ordered filters, and (fuzzy) positive implicativeordered filters are stated. The extensionproperty for (fuzzy) absorbent orderedfilters is established. Conditions for (fuzzy) ordered filters to be (fuzzy)absorbent ordered filters are provided. The notions of normal/maximal fuzzyabsorbent ordered filters and complete absorbent ordered filters are introducedand their properties are investigated.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
45
61
http://ijfs.usb.ac.ir/article_219_2b5d899b27b4fb5bad6f5035658c89f7.pdf
dx.doi.org/10.22111/ijfs.2009.219
ON L-FUZZIFYING CONVERGENCE SPACES
Wei
Yao
Department of Mathematics, Beijing Institute of Technology, 100081 Beijing,
P.R. China
author
text
article
2009
eng
Based on a complete Heyting algebra L, the relations between Lfuzzifyingconvergence spaces and L-fuzzifying topological spaces are studied.It is shown that, as a reflective subcategory, the category of L-fuzzifying topologicalspaces could be embedded in the category of L-fuzzifying convergencespaces and the latter is cartesian closed. Also the specialization L-preorderof L-fuzzifying convergence spaces and that of L-fuzzifying topological spacesare investigated.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
63
80
http://ijfs.usb.ac.ir/article_220_60c18d2dc4972018a9b61194fa28e509.pdf
dx.doi.org/10.22111/ijfs.2009.220
ON ($\epsilon, \epsilon \vee q$)-FUZZY IDEALS OF BCI-ALGEBRAS
Jianming
Zhan
Department of Mathematics, Hubei Institute for Nationalities, Enshi,
Hubei Province,445000, P. R. China
author
Young Bae
Jun
Department of Mathematics Education, Gyeongsang National University,
Chinju 660-701, Korea
author
Bijan
Davvaz
Department of Mathematics, Yazd University, Yazd, Iran
author
text
article
2009
eng
The aim of this paper is to introduce the notions of ($\epsilon, \epsilon \vee q$)-fuzzy p-ideals, ($\epsilon, \epsilon \vee q$)-fuzzy q-ideals and ($\epsilon, \epsilon \vee q$)-fuzzy a-ideals in BCIalgebras and to investigate some of their properties. Several characterizationtheorems for these generalized fuzzy ideals are proved and the relationshipamong these generalized fuzzy ideals of BCI-algebras is discussed. It is shownthat a fuzzy set of a BCI-algebra is an ($\epsilon, \epsilon \vee q$)-fuzzy a-ideal if and only if itis both an ($\epsilon, \epsilon \vee q$)-fuzzy p-ideal and an ($\epsilon, \epsilon \vee q$)-fuzzy q-ideal. Finally, the concept of implication-based fuzzy a-ideals in BCI-algebras is introduced and,in particular, the implication operators in Lukasiewicz system of continuousvaluedlogic are discussed.
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
81
94
http://ijfs.usb.ac.ir/article_222_5803dad8f3359c0150f261e18f2d8330.pdf
dx.doi.org/10.22111/ijfs.2009.222
Persian-translation Vol.6, No.1, Februery 2009
text
article
2009
eng
Iranian Journal of Fuzzy Systems
University of Sistan and Baluchestan
1735-0654
6
v.
1
no.
2009
97
102
http://ijfs.usb.ac.ir/article_2900_7982b613498239c3a5bb8604cc60869b.pdf
dx.doi.org/10.22111/ijfs.2009.2900