Meet the editor

Prof. Dr. Constantin Volosencu graduated as an engineer from the "Traian Vuia" Politechnic Institute Timisoara, Romania, and obtained a doctorate from the Politehnica University of Timisoara where he is currently a full professor in the Department of Automation and Applied Informatics. He is the author of ten books, seven book chapters, twenty-seven patents, and more than 160 journal and conference papers. He has also edited

eleven books. Dr. Volosencu is a manager of research grants, an editor in chief and member of international journal editorial boards, a former plenary speaker, a member of scientific committees, and a chair at international conferences. His research is in the fields of control systems, control of electric drives, fuzzy control systems, neural network applications, fault detection and diagnosis, sensor network applications, monitoring of distributed parameter systems, and power ultrasound applications. He has developed automation equipment for machine tools, spooling machines, high-power ultrasound processes, and more.

Contents

**Section 1**

**Preface XI**

Fuzzy Mathematics **1**

**Chapter 1 3**

**Chapter 2 15**

**Chapter 3 29**

**Chapter 4 41**

Decision Making **65**

**Chapter 5 67**

**Chapter 6 83**

Clustering **97**

**Chapter 7 99**

Existence, Uniqueness and Approximate Solutions of Fuzzy

*by Atimad Harir, Said Melliani and Lalla Saadia Chadli*

(α, β)–Pythagorean Fuzzy Numbers Descriptor Systems

*by Vakeel A. Khan, Mobeen Ahmad and Masood Alam*

Modified Expression to Evaluate the Correlation Coefficient of Dual Hesitant Fuzzy Sets and Its Application to Multi-Attribute

Evaluating the Organizational Hierarchy Using the IFSAW

Data Clustering for Fuzzyfier Value Derivation

*by Chuan-qiang Fan, Wei-he Xie and Feng Liu*

Fractional Differential Equations

A Study of Fuzzy Sequence Spaces

Towards a Fuzzy Context Logic

*by Hedda Schmidtke*

Decision Making *by Akanksha Singh*

*by Mahuya Deb*

*by JaeHyuk Cho*

**Section 3**

and TOPSIS Techniques

**Section 2**
