Circular intuitionistic fuzzy set (C-IFS) is introduced by Atanassov in 2020 as an extension of
intuitionistic fuzzy sets. It is represented by a circle with a radius (r) of each element consist …

The primary purpose of this study is to introduce diamond intuitionistic fuzzy sets (D-IFS s).
Although several generalizations of intuitionistic fuzzy sets have been introduced in the …

The supplier appraisal process is one of the most important decision problems for
companies focused on improving supply chain costs. Supplier selection is typically a multi …

Nowadays, the main attention and tendencies of tourists are towards ecotourism and its
related activities. Ecotourism centers are an active business in the ecotourism industry that …

The emergence of sustainability paradigm has influenced many research disciplines
including supply chain management. It has drawn the attention of manufacturing companies' …

In multi-attribute group decision making methods, team often needs to deal with both
quantitative data and qualitative information with uncertainty. It is essential to properly …

Risk management is one of the most influential parts of project management that has a
major impact on the success or failure of projects. Due to the increasing use of information …

The main objectives of supply chain management are reducing the risk of supply chain and
production cost, increase the income, improve the customer services, optimizing the …

Since 1952, when the mean-variance model of Markowitz was introduced as a basic
framework for modern portfolio theory, some researchers have been trying to add new …

It is important to have an intuitionistic fuzzy set that allows each set element to have a
membership value, a non-membership value, and a hesitancy value. This is because each …