International Conference on Intuitionistic Fuzzy Sets

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International Conference on Intuitionistic Fuzzy Sets is a scientific meeting devoted to the intuitionistic fuzzy sets, held in Sofia or Varna, Bulgaria annually since 1997 year. It is organized on the basis of a bilateral agreement for scientific cooperation between Institute of Biophysics and Biomedical Engineering at the Bulgarian Academy of Sciences and Systems Research Institute at the Polish Academy of Sciences.

The papers, presented at the conference, are published in the journal "Notes on Intuitionistic Fuzzy Sets".

Conference Proceedings

1st ICIFS

First ICIFS was held on 18-19 October 1997 in Sofia. The conference proceedings are published in NIFS, Vol. 3, No. 4.

Number Title Author(s) Pages
1 On measuring distances between intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 1—13
2 On intuitionistic fuzzy sets Supriya Kumar De, Ranjit Biswas, Akhil Ranjan Roy 14—20
3 About the intuitionistic fuzzy set generators Humberto Bustince, Victoria Mohedano 21—27
4 Some operators on intuitionistic fuzzy sets Krassimir Atanassov 28—33
5 A note on union and intersection of intuitionistic fuzzy sets Kankana Chakrabarty, Ranjit Biswas, Sudarsan Nanda 34—39
6 A possibility for implementation of elements of the intuitionistic fuzzy logic in decision making in medicine Anthony Shannon, Soon Ki Kim, Young Hyun Kim, Joseph Sorsich, Krassimir Atanassov, Peter Georgiev 40—43
7 Intuitionistic fuzzy feature-value operations Nikolai Nikolov 44—49

2nd ICIFS

Second ICIFS was held on 3-4 October 1998 in Sofia. The conference proceedings are published in NIFS, Vol. 4, No. 2 and Vol. 4, No. 3.

Number Title Author(s) Pages
Preface 1—2
1 On the concept of intuitionistic fuzzy set and its development throughout the last fifteen years Krassimir Atanassov 3—17
2 Concavoconvex intuitionistic fuzzy sets Adrian Ban 18—22
3 Environmental impact assessment: an intuitionistic fuzzy approach Srijit Biswas 23—27
4 On intuitionistic fuzzy sets Supriya Kumar De, Ranjit Biswas, Akhil Ranjan Roy 28—33
5 Intuitionistic fuzzy database Supriya Kumar De, Ranjit Biswas, Akhil Ranjan Roy 34—41
6 Fundamental justification of intuitionistic fuzzy logic and of interval-valued fuzzy methods Misha Koshelev, Vladik Kreinovich, Bhuvan Rachamreddy, Haris Yasemis, Krassimir Atanassov 42—46
7 Fuzzy justification of heuristic methods in inverse problems and in numerical computations, with applications to detection of business cycles from fuzzy and intuitionistic fuzzy data Vladik Kreinovich, Hung Nguyen, Berlin Wu, Krassimir Atanassov 47—56
Number Title Author(s) Pages
1 Natural requirements for natural roundings lead to a hardware-independent characterization of standard rounding procedures T. E. Kaminsky, Vladik Kreinovich 57—64
2 Reengineering frameworks: issues for fuzzy modeling Cecilia Temponi 65—73
3 Construction of investment expert system on the basis of intuitionistic fuzzy logic Peter V. Vassilev 74—78
4 Generalized net model of health unit activities (an intuitionistic fuzzy approach) Anthony Shannon, Dimiter Iliev, Eulalia Szmidt, Hristo Aladjov, Humberto Bustince Sola, Janusz Kacprzyk, Joseph Sorsich, Krassimir Atanassov, Nikolai Nikolov, Peter Georgiev, Valentina Radeva 79—84
5 An intuitionistic fuzzy generalized net for optimal scheduling of ore handling processes at a sintering plant Idilia Batchkova, Peter Georgiev, Valentina Radeva 85—91
6 A family of residuated implication functions based on parametrized T-norms Thomas Whalen 92—99
Authors index 100

3rd ICIFS

Third ICIFS was held on 16-17 October 1999 in Sofia. The conference proceedings are published in NIFS, Vol. 5, No. 3.

Number Title Author(s) Pages
1 Fuzzy multifunctions in intuitionistic fuzzy topological spaces Oya Bedre Özbakir, Doğan Çoker 1—5
2 An idea for an intuitionistic fuzzy approach to decision making Cecilia Temponi, Anthony Shannon, Krassimir Atanassov, Adrian Ban 6—10
3 From fuzzy values to intuitionistic fuzzy values to intuitionistic fuzzy intervals, etc: Can we get an arbitrary ordering? Vladik Kreinovich, Masao Mukaidono, Krassimir Atanassov 11—18
4 Probability measures for intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 19—28
5 Intuitionistic fuzzy extension principle Mariana Stoeva 29—30
6 Measures of contradiction for intuitionistic fuzzy sets and for fuzzy classifications Jiri Georg Sustal 31—34

4th ICIFS

Fourth ICIFS was held on 16-17 September 2000 in Sofia. The conference proceedings are published in NIFS, Vol. 6, No. 3 and Vol. 6, No. 4.

Number Title Author(s) Pages
1 Intuitionistic fuzzy relations and consensus formations Eulalia Szmidt, Janusz Kacprzyk 1—10
2 Intuitionistic fuzzy ideals of inclines Young Bae Jun, Hee Sik Kim 11—19
3 A short remark on an intuitionistic fuzzy abstract system Krassimir Atanassov 20—23
4 Intuitionistic proximity S. K. Samanta, Tapas Kumar Mondal 24—34
Number Title Author(s) Pages
1 Measurable entropy of intuitionistic fuzzy dynamical system Adrian Ban 35—47
2 Non-well-founded fuzzy and intuitionistic fuzzy sets: A definition and some properties Nikolai Nikolov 48—54
3 A remark on an intuitionistic fuzzy approach to a problem in star dynamics Krassimir Atanassov, Dimitar Sasselov 55—58
4 Generalized net model of the cardiovascular system. An intuitionistic fuzzy approach Joseph Sorsich, Anthony Shannon, Krassimir Atanassov 59—63
5 A generalized net for intellectual games learning: An intuitionistic fuzzy approach Hristo Aladjov 64—69

5th ICIFS

Fifth ICIFS was held on 22-23 September 2001 in Sofia. The conference proceedings are published in NIFS, Vol. 7, No. 3 and Vol. 7, No. 4.

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Number Title Author(s) Pages
1 On the defect of intuitionistic fuzzy tautology Adrian I. Ban 1—7
2 IF-bags in decision analysis Kankana Chakrabarty 8—13
3 On the Cartesian product of intuitionistic fuzzy sets Glad Deschrijver, Etienne Kerre 14—22
4 (k1-k2)-Intuitionistic fuzzy sets Tapas Kumar Mondal, S. K. Samanta 23—32
5 On the possibility for intuitionistic fuzzy interpretations of modal logic axioms Krassimir Atanassov 33—38
6 Introduction to intuitionistic fuzzy partial differential equations Said Melliani, Lalla Saadia Chadli 39—42
7 Deductive properties of intuitionistic fuzzy logic Nikolai Nikolov 43—48
Number Title Author(s) Pages
1 Conflicting situations in flexible systems Panagiotis Chountas, Ilias Petrounias, Krassimir Atanassov 49—57
2 Intuitionistic fuzzy sets in some medical applications Eulalia Szmidt, Janusz Kacprzyk 58—64
3 On intuitionistic fuzzy consent rules Dinko Dimitrov 65—69
4 On an application of intuitionistic fuzzy approach in economic models Peter Vassilev, Cecilia Temponi, Vladik Kreinovich 70—72
5 On the implementation of elements of the intuitionistic fuzzy logic for decision making by medical generalized net models Anthony Shannon, Joseph Sorsich, Krassimir Atanassov, Soon-Ki Kim, Young Hyun Kim 73—76
6 Intuitionistic fuzzy languages in syntactic pattern recognition Ketty Peeva 77—83
7 Application of intuitionistic fuzzy generalized nets to problems in soda ash production Yuliana Mihaylova, Peter Georgiev, Maria Stefanova-Pavlova 84—88

6th ICIFS

Sixth ICIFS was held on 13-14 September 2002 in Varna. The conference proceedings are published in Vol. 8, No. 3.

Number Title Author(s) Pages
1 On the representation of intuitionistic fuzzy t-norms and t-conorms Glad Deschrijver, Chris Cornelis, Etienne Kerre 1—10
2 Concept of distances and entropy for intuitionistic fuzzy sets and their applications in group decision making Eulalia Szmidt, Janusz Kacprzyk 11—25
3 Sequences of intuitionistic fuzzy numbers Mariana Nikolova 26—30
4 An example for a difference between ordinary (crisp), fuzzy and intuitionistic fuzzy sets Lyudmila Todorova, Krassimir Atanassov 31—33
5 On distance between intuitionistic fuzzy sets Lalla Saadia Chadli, Said Melliani 34—36
6 Direct and inverse problem resolution in intuitionistic fuzzy relational calculus Ketty Peeva 37—44
7 Numerical solution of fuzzy differential equation by Runge-Kutta method and the intuitionistic treatment Said Abbasbandy, T. Allah Viranloo 45—53
8 A note on a new category of intuitionistic fuzzy sets Basil Papadopoulos, Apostolos Syropoulos, Krassimir Atanassov 54—56
9 Representing and querying temporal workflow schemas Hathal Al-Roki, Panagiotis Chountas, Ilias Petrounias, Vassilis Kodogiannis, Boyan Kolev 57—65
10 Intuitionistic fuzzy interpretations of multi-measurement tool multi-criteria decision making Krassimir Atanassov, Gabriella Pasi, Ronald Yager 66—74
11 From [0,1]-based logic to interval logic Hung T. Nguyen, Vladik Kreinovich 75—94
12 Intuitionistic fuzzy generalized nets in analyzing transaction database systems with continuous deadlock detection Boyan Kolev, Panagiotis Chountas, Ilias Petrounias 95—100
13 Intuitionistic fuzzy generalized net model for diabetes mellitus Anthony Shannon, Joseph Sorsich, Stefan Hadjitodorov, Georgi Gluhchev 101—104
14 Reoptimization of crude oil distillation plant using intuitionistic fuzzy generalized nets Idilia Batchkova, Joanna Alexieva 105—112
15 An intuitionistic fuzzy generalized net application in a negatronic generator Zlatogor Minchev, Hugo Oscar 113—118
16 Common-sense deduction with fuzzy and intuitionistic fuzzy logic Nikolai Nikolov 119—129
17 An intuitionistic fuzzy Petri net at the supervisory level of a discrete event dynamic system Valeri Gochev 130—134

7th ICIFS

Seventh ICIFS was held on 23-24 August 2003 in Sofia. The conference proceedings are published in NIFS, Vol. 9, No. 3 and Vol. 9, No. 4.

Number Title Author(s) Pages
1 "Twenty years later" or some words about the intuitionistic fuzzy sets Krassimir Atanassov 1—3
2 Examples of intuitionistic fuzzy algebras and intuitionistic fuzzy measures Adrian Ban 4—10
3 Square and triangle: Reflections on two prominent mathematical structures for the representation of imprecision Chris Cornelis, Glad Deschrijver, Etienne Kerre 11—21
4 Some ways and means to define addition and multiplication operations between intuitionistic fuzzy sets Radoslav Tzvetkov 22—25
5 Solution of intuitionistic fuzzy equation with extended operations Lalla Saadia Chadli, Said Melliani 26—32
6 Some properties of mappings in the model VH Gokhan Çuvalcioğlu 33—39
7 Finite intuitionistic fuzzy machines Ketty Peeva 40—45
8 Intuitionistic fuzzy logic and possibility distributions Nikolai Nikolov 46—50
9 A concept of similarity for intuitionistic fuzzy sets and its use in the aggregation of experts' testimonies Eulalia Szmidt, Janusz Kacprzyk 51—59
10 New similarity measures for intuitionistic fuzzy theory and mass assignment theory Eulalia Szmidt, Jim Baldwin 60—76
Number Title Author(s) Pages
1 A note on intuitionistic fuzzy routing Channappa Akki, Ranjit Biswas 77—82
2 Normalization of intuitionistic fuzzy relational databases M. Afshar Alam, Sharfuddin Ahmad, Ranjit Biswas 83—89
3 A method of intuitionistic fuzzy search Ashit Kumar Dutta, Abdul Quaiyum Ansari 90—101
4 A generalized net model of the process of face recognition with elements of intuitionistic fuzziness Anthony Shannon, Georgi Gluhchev, Vasil Vasilev, Krassimir Atanassov, Stefan Hadjitodorov 102—108
5 Intuitionistic fuzzy relational databases Boyan Kolev, Panagiotis Chountas 109—113
6 Temporal aspects of web log analysis Ilias Petrounias, Ahmed Aburodes Assaid Elkilany, Panagiotis Chountas, Boyan Kolev 114—122
7 Generalized net model of the intranet in a university, using intuitionistic fuzzy estimations Anthony Shannon, Daniela Orozova, Dimitar Sasselov, Evdokia Sotirova, Ilias Petrounias, Krassimir Atanassov, Maciej Krawczak, Pedro Melo-Pinto, Seog-Hoon Rim, Taekyun Kim 123—128
8 Intuitionistic fuzzy interpretation for photographic records of relatively unpredictable events Boyan Djakov, Krassimir Atanassov 129—134
9 Application of intuitionistic fuzzy logic in expert system for textile engineering Yordan Kyosev 135—139
10 Intuitionistic fuzzy generalized net models of the elements of a system for softened water production Joanna Alexieva, Boyan Kolev 140—150

8th ICIFS

Eighth ICIFS was held on 20-21 June 2004 in Varna. The conference proceedings are published in NIFS, Vol. 10, No. 3 and Vol. 10, No. 4.

Number Title Author(s) Pages
1 Intuitionistic fuzzy-valued possibility and necessity measures Adrian Ban 1—7
2 A note on the convergence of intuitionistic fuzzy sets Peter Vassilev 8—14
3 Entropy for intuitionistic fuzzy set theory and mass assignment theory Eulalia Szmidt, Jim Baldwin 15—28
4 On some temporal intuitionistic fuzzy operators Krassimir Atanassov 29—32
5 Symmetrical difference over intuitionistic fuzzy sets Anton Antonov 33—36
6 Solving problems in intuitionistic fuzzy relational calculus with fuzzy relational calculus toolbox Ketty Peeva, Yordan Kyosev 37—43
7 Derivatives related to intuitionistic fuzzy sets Radoslav Tzvetkov 44—46
Number Title Author(s) Pages
1 Temporality and intuitionistic fuzzy data warehouses Panagiotis Chountas, Ilias Petrounias, Chris Vasilakis, Elia El-Darzi, Andy Tseng, Boyan Kolev, Vassilis Kodogiannis, Peter Georgiev 47—55
2 Intuitionistic fuzzy Voronoi diagrams — definition and properties Lyudmila Todorova, Anton Antonov, Stefan Hadjitodorov 56—60
3 Medical diagnostic reasoning using a similarity measure for intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 61—69
4 Application of intuitionistic fuzzy logic in systems for analytical data processing Ivanka Valova 70—74
5 Global generalized net model of a human body: An intuitionistic fuzzy approach Anthony Shannon, Krassimir Atanassov, Vihren Chakarov 75—81
6 An intuitionistic fuzzy application in infrared object-reflecting sensors of a mobile robot Zlatogor Minchev 82—85
7 Building hierarchy for patients attendance in intensive care unit with use of generalized nets and intuitionistic fuzzy sets Violeta Tasseva, Evelina Pazvanska, Mihail Matveev 86—90
8 Generalized net model of a university electronic library Anthony Shannon, Daniela Orozova-Langova, Evdokia Sotirova, Krassimir Atanassov, Pedro Melo-Pinto, Taekyun Kim 91—96

9th ICIFS

Ninth ICIFS was held on 7-8 May 2005 in Sofia. The conference proceedings are published in NIFS, Vol. 11, No. 2, Vol. 11, No. 3, and Vol. 11, No. 4.

Number Title Author(s) Pages
1 Towards combining two kinds of intuitionistic fuzzy sets Krassimir Atanassov, Trifon Trifonov 1—11
2 New measures of entropy for intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 12—20
3 On one of the geometrical interpretations of the intuitionistic fuzzy sets Violeta Tasseva, Eulalia Szmidt, Janusz Kacprzyk 21—27
4 A simplification of the neutrosophic sets. Neutrosophic logic and intuitionistic fuzzy sets Kalin Georgiev 28—31
5 Some properties of the averaging operator on intuitionistic fuzzy sets Bilian Belchev 32—37
6 A new geometrical interpretation of some concepts in the intuitionistic fuzzy logic Anestis Hatzimichailidis, Basil Papadopoulos 38—46
7 Sugeno integral with respect to intuitionistic fuzzy-valued measures Adrian Ban 47—61
Number Title Author(s) Pages
1 On intuitionistic fuzzy interpretations of elements of utility theory. Part 1 Gabriella Pasi, Krassimir Atanassov, Ronald Yager 62—65
2 IF-probability on MV-algebras Katarína Lendelová 66—72
3 IFS-valued possibility and necessity measures Alžbeta Michalíková 73—77
4 Cardinality and entropy of IF sets Pavol Král 78—87
5 Intuitionistic fuzzy Voronoi diagrams — definition and properties. Part 2 Lyudmila Todorova, Anton Antonov 88—90
6 Remark on a possible application of intuitionistic fuzzy sets in algebra Mladen Vassilev-Missana 91—94
7 Generalized net model with intuitionistic fuzzy estimations of the process of obtaining of scientific titles and degrees Anthony Shannon, Beloslav Riečan, Daniela Langova-Orozova, Elia EI-Darzi, Etienne Kerre, Evdokia Sotirova, Florin Gorunescu, Ilias Petrounias, Jennifer Trelewicz, Krassimir Atanassov, Maciej Krawczak, Panagiotis Chountas, Pedro Melo-Pinto, Peter Georgiev. Taekyun Kim, Violeta Tasseva 95—114
8 Contrast intensification of second type generalized intuitionistic fuzzy sets Parvathi Rangasamy, N. Palaniappan 115—122
Number Title Author(s) Pages
1 Intuitionistic fuzzy generalized nets in modeling web usage patterns identification Ilias Petrounias, Andy Tseng, Panagiotis Chountas, Boyan Kolev, Elia El-Darzi, Vassilis Kodogiannis 123—129
2 A new similarity measure for intuitionistic fuzzy sets and its use in supporting a medical diagnosis Eulalia Szmidt, Janusz Kacprzyk, Mikhail Matveev 130—138
3 Object-oriented principles and associations in multidimensional models. Intuitionistic fuzzy estimations Ivanka Valova 139—145
4 Generalized net model of decision making processes in the management's systems with use of intuitionistic fuzzy sets Rossen Iliev 146—150
5 Modelling of temperature control system in fermentation processes using generalized nets and intuitionistic fuzzy logics Olympia Roeva, Tania Pencheva, Isabel Bentes, Maria Manuel Nascimento 151—157
6 Neural network for defining intuitionistic fuzzy sets in e-learning Sotir Sotirov, Ludmil Dakovski, G. Nenov 158—161
7 Linear dependence and linear independence in intuitionistic fuzzy sets Ketty Peeva, Zlatko Zahariev 162—169
8 On some types of intuitionistic fuzzy negations Krassimir Atanassov 170—172

10th ICIFS

Tenth ICIFS was held on 28-29 October 2006 in Sofia. The conference proceedings are published in NIFS, Vol. 12, No. 3.

Number Title Author(s) Pages
1 Classification with nominal data using in intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 1—14
2 А generalized net describing а process of decision making with intuitionistic fuzzy expert scores Krassimir Atanassov, Eulalia Szmidt, Janusz Kacprzyk 15—19
3 Some operations on intuitionistic fuzzy sets of root type N. Palaniappan, R. Srinivasan, Parvathi Rangasamy 20—29
4 Online consultations system with intuitionistic fuzzy estimations Daniela Orozova, Teodor Tzhechev 30—34
5 Generalized net model of а self-developing expert system Krassimir Atanassov, Panagiotis Chountas, Boyan Kolev, Evdokia Sotirova 35—40
6 Generalized net modelling of the process of introducing new product то the market and intuitionistic fuzzy estimating its effectiveness Evdokia Sotirova, Krassimir Atanassov, Sotir Sotirov, Ludmila Borisova, Petar Vanev, Ivan Vitanov 41—45
7 The cubes' magic and their application in different fields of science Ivanka Valova 46—54
8 On а class of d-fuzzy sets and d-intuitionistic fuzzy sets Peter Vassilev 55—59
9 On the generalized net modelling of healthcare local area network using intuitionistic fuzzy estimations Anthony Shannon, Desislava Peneva, Elia El-Darzi, Krassimir Atanassov, Panagiotis Chountas, Violeta Tasseva 60—68
10 On two concepts of probability on IF-sets Beloslav Riečan 69—72

11th ICIFS

Eleventh ICIFS was held on 28-30 April 2007 in Sofia. The conference proceedings are published in NIFS, Vol. 13, No. 2.

Number Title Author(s) Pages
1 Componentwise decomposition of intuitionistic L-fuzzy integrals and interval-valued intuitionistic fuzzy integrals Adrian Ban, Ioan Fechete 1—7
2 Two- and three-parameter representation of intuitionistic fuzzy sets in the context of entropy and similarity Eulalia Szmidt, Janusz Kacprzyk 8—17
3 Extended Choquet integrals and intuitionistic fuzzy sets Radoslav Tzvetkov 18—22
4 On the probability theory of IF-events Beloslav Riečan 23—29
5 Laws of large numbers for M-observables Petra Mazureková 30—35
6 On probabilities on IF-sets and MV-algebras Vladislav Biba 36—38
7 On exponential and logarithmic functions on IF sets Ivana Hollá 39—41
8 On some properties of the intuitionistic fuzzy operator Xa,b,c,d,e,f Krassimir Atanassov 42—47
9 Generalized net model of SSL with intuitionistic fuzzy estimations Ivelina Vardeva, Sotir Sotirov 48—53
10 Generalized net for control and optimization of real processes through neural networks using intuitionistic fuzzy estimations Maciej Krawczak, Elia El-Darzi, Krassimir Atanassov, Violeta Tasseva 54—60
11 Generalized net model of algorithm for intuitionistic fuzzy estimations Peter Georgiev, Lyudmila Todorova, Peter Vassilev 61—70
12 Generalized net modelling of workflow in tasks processing and tracking systems using intuitionistic fuzzy estimations Desislava Peneva, Violeta Tasseva, Elia El-Darzi, Eulalia Szmidt 71—80
13 System for electronic student-teacher interactions with intuitionistic fuzzy estimations Anthony Shannon, Daniela Orozova, Evdokia Sotirova, Krassimir Atanassov, Maciej Krawczak, Pedro Melo-Pinto, Taekyun Kim 81—87
14 Intuitionistic fuzzy knowledge-based OLAP Ermir Rogova, Panagiotis Chountas, Boyan Kolev 88—100
15 On properties of some IFS operators and operations Qiongsun Liu, Cui Ma, Xiandong Zhou 101—107

12th ICIFS

Twelfth ICIFS was held on 17-18 May 2008 in Sofia. The conference proceedings are published in NIFS, Vol. 14, No. 1 and Vol. 14, No. 2.

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Number Title Author(s) Pages
1 Intuitionistic fuzzy sets and fuzzy sets depending on Q-norms Peter Vassilev, Mladen Vassilev-Missana 1—6
2 On intuitionistic fuzzy negations and intuitionistic fuzzy extended modal operators. Part 1 Chris Hinde, Krassimir Atanassov 7—11
3 On some properties of one Cartesian product over intuitionistic fuzzy sets Velin Andonov 12—19
4 Inequalities with intuitionistic fuzzy topological and Gokhan Çuvalcioğlu's operators Boriana Doycheva 20—22
5 IF nearness Vladimír Janiš 23—26
6 The most general form of one type of intuitionistic fuzzy modal operators. Part 2 Krassimir Atanassov 27—32
7 Operation ÷ over intuitionistic fuzzy sets Anton Cholakov 33—37
8 Trapezoidal approximations of intuitionistic fuzzy numbers expressed by value, ambiguity, width and weighted expected value Adrian Ban 38—47
9 Ranking intuitionistic fuzzy alternatives Eulalia Szmidt, Janusz Kacprzyk 48—56
10 Inequalities with intuitionistic fuzzy modal and topological operators Hristo Inkiov 57—58
Number Title Author(s) Pages
1 Role of fuzzy and intuitionistic fuzzy contrast intensification operators in enhancing images Parvathi Rangasamy, Jayanthi Kuppannan, Krassimir Atanassov, Georgi Gluhchev 59—66
2 An application of intuitionistic fuzzy information for handwritten Arabic word recognition Leila Baccour, Slim Kanoun, Volker Maergner, Mohamed Adel Alimi 67—72
3 Determining the specificity, sensitivity, positive and negative predictive values in intuitionistic fuzzy logic Ludmila Todorova 73—79
4 Multifactor method of teaching quality estimation at universities with intuitionistic fuzzy evaluation Maria Hristova, Evdokia Sotirova 80—83
5 A method for ordering of university subjects using intuitionistic fuzzy evaluation Anthony Shannon, Beloslav Riečan, Evdokia Sotirova, Krassimir Atanassov, Maciej Krawczak, Peter Georgiev, Roumen Nikolov, Sotir Sotirov, Taekyun Kim 84—87
6 Determining intuitionistic fuzzy index for overall employees' performance based on objectives and KPIs Pavel Tcheshmedjiev, Peter Vassilev 88—90
7 Bacillus colonies recognition using intuitionistic fuzzy sets Vahid Khatibi, Gh. A. Montazer 91—99
8 Four extended level operators of membership/non-membership over intuitionistic fuzzy sets Tsvetan Vassilev 100—107
9 Generalized net model of the auto ferry traffic Vasil Bobev, Sotir Sotirov 108—112


13th ICIFS

Thirteenth ICIFS was held on 9-10 May 2009 in Sofia. The conference proceedings are published in NIFS, Vol. 15, No. 1 and Vol. 15, No. 2.

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Number Title Author(s) Pages
1 A note on the Hausdorff distance between Atanassov's intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk 1—12
2 A method to obtain trapezoidal approximations of intuitionistic fuzzy numbers from trapezoidal approximations of fuzzy sets Adrian Ban, Lucian Coroianu 13—25
3 Theorem for equivalence of the two most general intuitionistic fuzzy modal operators Krassimir Atanassov 26—31
4 On some properties of intuitionistic fuzzy negation ¬@ Lilija Atanassova 32—35
5 Ergodic theorem on B-structures Lenka Lašová, Magdaléna Renčová 36—41
6 A note on properties of temporal intuitionistic fuzzy sets Parvathi Rangasamy, S. P. Geetha 42—48

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Number Title Author(s) Pages
1 A framework for a prototype of an intuitionistic fuzzy expert system Diana Boyadzhieva 1—9
2 Fault tree analysis in an intuitionistic fuzzy configuration management database Boyan Kolev, Ivaylo Ivanov 10—17
3 Generalized net model of the intuitionistic fuzzy feed forward neural network Krassimir Atanassov, Sotir Sotirov, Maciej Krawczak 18—23
4 Intuitionistic fuzzy detection of signal availability in multipath wireless channels Dimitar Valchev, Sotir Sotirov 24—29
5 On intuitionistic fuzzy trees Panagiotis Chountas, Mohammedsharaf Alzebdi, Anthony Shannon, Krassimir Atanassov 30—32
6 Neural network for defining intuitionistic fuzzy sets in e-learning Sotir Sotirov, Evdokia Sotirova, Daniela Orozova 33—36

14th ICIFS

The Fourteenth ICIFS was held on 15-16 May 2010 in Sofia. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 16, No. 2.

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Number Title Author(s) Pages
1 On some measures of information and knowledge for intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk, Paweł Bujnowski 1—11
2 A note on the extended modal operator Gα,β Peter Vassilev 12—15
3 Equalities with intuitionistic fuzzy subtractions and negations Krassimir Atanassov, Magdaléna Renčová, Dimitar Dimitrov 16—21
4 On some issues related to the distances between the Atanassov intuitionistic fuzzy sets are described on universe with weights Radoslav Tcvetkov, Eulalia Szmidt, Janusz Kacprzyk 22—30
5 Four modal forms of intuitionistic fuzzy implication →@ and two related intuitionistic fuzzy negations. Part 1 Lilija Atanassova 31—34
6 On the new intuitionistic fuzzy operator xa,b,c,d,e,f Krassimir Atanassov 35—38
7 Domination in intuitionistic fuzzy graphs G. Thamizhendhi, Rangasamy Parvathi 39—50
8 Generalized net model of process of the administration servicing in a digital university with intuitionistic fuzzy estimations Anthony Shannon, Evdokia Sotirova, Krassimir Atanassov, Maciej Krawczak, Pedro Melo-Pinto, Sotir Sotirov, Stefan Hadjitodorov, Taekyun Kim 51—56

15th ICIFS

The Fifteenth ICIFS was held on 11-12 May 2011 in Burgas. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 17, No. 2.

Number Title Author(s) Pages
1 On intuitionistic fuzzy multi-dimensional sets. Part 4 Krassimir Atanassov, Eulalia Szmidt, Janusz Kacprzyk 1—7
2 On some two-parametric intuitionistic fuzzy implications Piotr Dworniczak 8—16
3 On intuitionistic fuzzy tree-interpretations by index matrices Rangasamy Parvathi, Anthony Shannon, Panagiotis Chountas, Krassimir Atanassov 17—24
4 Pearson's coefficient between intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk, Paweł Bujnowski 25—34
5 On α- and α*- separation axioms in intuitionistic fuzzy topological spaces Rekha Srivastava, Amit Kumar Singh 35—43
6 Parameter tuning in fuzzy clustering of intuitionistic fuzzy data. Part 1 N. Karthikeyini Visalakshi, Rangasamy Parvathi, Vassia Atanassova 44—51
7 Intuitionistic fuzzy optimization technique for the solution of an EOQ model Susovan Chakrabortty, Madhumangal Pal, Prasun Kumar Nayak 52—64
8 On Łukasiewicz's intuitionistic fuzzy subtraction Beloslav Riečan, Krassimir Atanassov 65—67
9 A note on distance and similarity measures between intuitionistic fuzzy sets Peter Vassilev 68—74
10 Intuitionistic fuzzy estimation of the ant colony optimization starting points: Part 2 Stefka Fidanova, Pencho Marinov 75—81
11 Intuitionistic fuzzy rw-closed sets and intuitionistic fuzzy rw-continuity S. S. Thakur, Jyoti Pandey Bajpai 82—96

16th ICIFS

The Sixteenth ICIFS was held on 9–10 September 2012 in Sofia. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 18, No. 3.

Number Title Author(s) Pages
1 Intuitionistic fuzzy integrals Radoslav Tcvetkov 1—7
2 Absolute value and limit of the function defined on IF sets Alžbeta Michalíková 8—15
3 On the operators partially extending the extended intuitionistic fuzzy operators from modal type Krassimir Atanassov 16—22
4 A note on the unconscientious experts’ evaluations in the intuitionistic fuzzy environment Piotr Dworniczak 23—29
5 On the intuitionistic fuzzy sets with metric type relation between the membership and non-membership functions Peter Vassilev 30—38
6 An experimental analysis of some measures of information and knowledge for intuitionistic fuzzy sets Eulalia Szmidt, Janusz Kacprzyk and Paweł Bujnowski 39—48
7 A new formula for de-i-fuzzification of intuitionistic fuzzy sets Vassia Atanassova and Sotir Sotirov 49—51
8 Properties of intuitionistic fuzzy line graphs M. Akram and R. Parvathi 52—60
9 A generalized net model of university subjects rating with intuitionistic fuzzy estimations Antony Shannon, Beloslav Riečan, Evdokia Sotirova, Genoveva Inovska, Krassimir Atanassov, Maciej Krawczak, Pedro Melo-Pinto and Taekyun Kim 61—67
10 Some properties of intuitionistic fuzzy primary and semiprimary ideals M. Palanivelrajan and S. Nandakumar 68—74

17th ICIFS

The Seventeenth ICIFS was held on 1-2 November 2013 in Sofia. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 19, No. 3.

Number Title Author(s) Pages
1 On intuitionistic fuzzy pairs Krassimir Atanassov, Eulalia Szmidt and Janusz Kacprzyk 1—13
2 Another definition of symmetrical difference over intuitionistic fuzzy sets Wen Sheng Du 14—19
3 Modifications of the weight-center operator, defined over intuitionistic fuzzy sets. Part 3 Beloslav Riečan, Adrian Ban and Krassimir Atanassov 20—24
4 On the operators and partial orderings of intuitionistic fuzzy sets Evgeniy Marinov 25—33
5 Taylor's theorem for functions, defined on Atanassov IF-sets Alžbeta Michalíková 34—41
6 On the law of large numbers for IF-events Beloslav Riečan 42—46
7 On intuitionistic fuzzy subsets with diminishing hesitancy values Peter Vassilev 47—50
8 From fuzzy to intuitionistic fuzzy: Easy and lazy Vassia Atanassova 51—55
9 The extension of modal operators' diagram with last operators Gökhan Çuvalcioğlu 56—61
10 Intuitionistic fuzzy component failure impact analysis (IFCFIA) – A gradual method for SLA dependency mapping and bi-polar impact assessment Roland Schütze 62—72


11 Hexagonal Game Method model of forest fire spread with intuitionistic fuzzy estimations Evdokia Sotirova, Veselina Bureva, Emilia Velizarova, Stefka Fidanova, Pencho Marinov, Anthony Shannon and Krassimir Atanassov 73—80
12 Intuitionistic fuzzy Multilayer Perceptron as a part of integrated systems for early forest-fire detection Sotir Sotirov, Ivelina Vardeva and Maciej Krawczak 81—89
13 Generalized real time multigraphs for communication networks: An intuitionistic fuzzy theoretical model Siddhartha Sankar Biswas, Bashir Alam and M. N. Doja 90—98
14 Intuitionistic fuzzy generalized nets with characteristics of the places of Types 1 and 3 Velin Andonov 99—110
15 Generalized net model of internal financial structural unit’s functionality with intuitionistic fuzzy estimations Lyubka Doukovska and George Shahpazov 111—117

18th ICIFS

The Eighteenth ICIFS was held on 10-11 May 2014 in Sofia. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 20, No. 2.

Number Title Author(s) Pages
1 Short remark on interval type-2 fuzzy sets and intuitionistic fuzzy sets Oscar Castillo, Patricia Melin, Radoslav Tsvetkov and Krassimir Atanassov 1—5
2 On level operators for temporal intuitionistic fuzzy sets Sinem Yilmaz and Gökhan Çuvalcioğlu 6—15
3 Extension of one of Baczynski–Jayaram’s problems Nora Angelova and Lilija Atanassova 16—22
4 First weight-center operator Magdaléna Tomová 23—26
5 Note on isohesitant intuitionistic fuzzy sets Peter Vassilev and Todor Stoyanov 27—30
6 On intuitionistic fuzzy homotopy theory Mehmet Çitil and Gökhan Çuvalcioğlu 31—36
7 Some properties of Controlled Set Theory Gökhan Çuvalcioğlu 37—42
8 Trapezoidal/triangular intuitionistic fuzzy numbers versus interval-valued trapezoidal/triangular fuzzy numbers and applications to multicriteria decision making methods Adrian Ban and Delia Tuşe 43—51
9 Two examples for the use of 3-dimensional intuitionistic fuzzy index matrices Krassimir Atanassov, Eulalia Szmidt, Janusz Kacprzyk and Veselina Bureva 52—59
10 Fundamental properties of generalized intuitionistic fuzzy groups Gökhan Çuvalcioğlu, Arif Bal and Esra Aykut 60—68
11 Uncertainty inspired by economical models Alžbeta Michalíková and Beloslav Riečan 69—74
12 Index matrix interpretation and intuitionistic fuzzy estimation of the diet problem Evgeniy Marinov and Elie Daumalle 75—84
13 Data-based approximation of intuitionistic fuzzy target sets Ray-Ming Chen 85—93
14 Discussion on the threshold values in the InterCriteria Decision Making approach Vassia Atanassova , Deyan Mavrov, Lyubka Doukovska and Krassimir Atanassov 94—99
15 Index matrix representation of intuitionistic fuzzy graphs Parvathi Rangasamy, S. Thilagavathi, G. Thamizhendhi and M. G. Karunambigai 100—108
16 Intuitionistic fuzzy evaluation of tokens in generalized nets based on their characteristics Velin Andonov 109—118
17 Intuitionistic fuzzy estimation of the doctoral comprehensive examination Evdokia Sotirova, Anthony Shannon, Sotir Sotirov and Maciej Krawczak 119—125


19th ICIFS

The Nineteenth ICIFS was held on 4-6 June 2015 in Burgas. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 21, No. 2.

Number Title Author(s) Pages
1 Short remark on two covering topological operators over intuitionistic fuzzy sets Oscar Castillo, Patricia Melin,Radoslav Tsvetkov and Krassimir Atanassov 1—5
2 Some algebraic properties of the matrix representation of intuitionistic fuzzy modal operators Gökhan Çuvalcioğlu,Sinem Yilmaz and Arif Bal 6—18
3 Some properties of the matrix representation of the intuitionistic fuzzy modal operators Sinem Yilmaz,Mehmet Çitil and Gökhan Çuvalcioğlu 19—24
4 On Fodor’s type of intuitionistic fuzzy implication and negation Krassimir Atanassov,Eulalia Szmidt and Janusz Kacprzyk 25—34
5 Intuitionistic fuzzy implications and Kolmogorov’s and Lukasiewisz–Tarski’s axioms of logic Nora Angelova,Evgeniy Marinov and Krassimir Atanassov 35—42
6 Intuitionistic fuzzy semigroup M. Elomari, S. Melliani,R. Ettoussi and L. S. Chadli 43—50
7 Solution of intuitionistic fuzzy differential equations by successive approximations method R. Ettoussi, S. Melliani, M. Elomari and L. S. Chadli 51—62
8 Temporal intuitionistic fuzzy topology in Šostak's sense Fatih Kutlu and Tunay Bilgin 63—70
9 An auxiliary technique for InterCriteria Analysis via a three dimensional index matrix Peter Vassilev, Lyudmila Todorova and Velin Andonov 71—76
10 Software for InterCriteria Analysis: Implementation of the main algorithm Deyan Mavrov 77—86
11 An intuitionistic fuzzy approach for IT service-level-management Roland Schuetze 87—98
12 InterCriteria analysis of genetic algorithm parameters in parameter identification Tania Pencheva, Maria Angelova, Vassia Atanassova and Olympia Roeva 99—110
13 Application of the InterCriteria decision making method to Bulgarian universities ranking Veselina Bureva, Evdokia Sotirova, Sotir Sotirov and Deyan Mavrov 111—117
14 Application of InterCriteria analysis to the Mesta River pollution modelling Tatiana Ilkova and Mitko Petrov 118—125
15 An example of intercriteria analysis application to weather parameters Todor Kostadinov and Todor Petkov 126—133
16 Intuitionistic fuzzy evaluations of the elbow joint range of motion in the sagittal plane Simeon Ribagin, Anthony Shannon, Maciej Krawczak and Krassimir Atanassov 134—139
17 An application of some intuitionistic fuzzy modal operators to agriculture Gökhan Çuvalcioğlu and Esra Aykut 140—149


20th ICIFS

The Twentieth ICIFS was held on 2-3 September 2016 in Sofia. The conference proceedings are published in Notes on Intuitionistic Fuzzy Sets, Vol. 22, No. 3.

Number Title Author(s) Pages
1 New Fodor's type of intuitionistic fuzzy implication and negation Krassimir Atanassov, Eulalia Szmidt and Janusz Kacprzyk 1—8
2 On IF-numbers Daniela Kluvancová and Beloslav Riečan 9—13
3 New properties of the intuitionistic fuzzy modal operator ⊗α,β,γ,δ Vassia Atanassova, Gökhan Çuvalcioğlu, Sinem Yılmaz and Krassimir Atanassov 14—20
4 On obtaining intuitionistic fuzzy estimates for similarity of strings Peter Vassilev and Todor Stoyanov 21—24
5 Properties of the intuitionistic fuzzy implications and negations Nora Angelova and Krassimir Atanassov 25—33
6 Intuitionistic fuzzy superfluous submodule Poonam Kumar Sharma and Gagandeep Kaur 34—46
7 Numerical solution of intuitionistic fuzzy differential equations by Adams' three order predictor-corrector method B. Ben Amma, S. Melliani and L. S. Chadli 47—69
8 Solution of system of first order linear differential equations in intuitionistic fuzzy environment Neha Singhal and S. P. Sharma 70—79
9 Evolution problem with intuitionistic fuzzy fractional derivative M. Elomari, S. Melliani and L. S. Chadli 80—90
10 InterCriteria Analysis of Bat Algorithm with Parameter Adaptation Using Type-1 and Interval Type-2 Fuzzy Systems Olympia Roeva, Jonathan Perez, Fevrier Valdez and Oscar Castillo 91—105
11 Operation "concatenation" over intuitionistic fuzzy index matrices Anthony Shannon, Vassia Atanassova and Krassimir Atanassov 106—111
12 An application of intercriteria decision making method to the rankings of universities in the United Kingdom Evdokia Sotirova, Veselina Bureva, Panagiotis Chountas and Maciej Krawczak 112—119
13 Intercriteria analysis for evaluation of the pollution of the Struma River in the Bulgarian section Tatiana Ilkova and Mitko Petrov 120—130


See also