An evaluation of ship investment in interval type-2 fuzzy environment
研究在区间二型模糊环境下，用净现值、盈利指数和回收期评估船舶投资，并首次提出区间二型模糊回收期和盈利指数方法，应用于航运业实际案例。
Investment is one of the most crucial factors for a company. The decisions that a company makes in an investment uncertainty environment with high global competition, such as in the shipping industry, affects the life of the company either positively or negatively. Therefore, correct decision-making is extremely important particularly in an environment of investment uncertainty. Fuzzy set theory can be used to represent uncertainty and vagueness to generate decisions in decision-making problems. In this study, the aim is to evaluate ship investment by means of Net Present Value (NPV), Profitability Index (PI), and Payback Period (PP) under the Trapezoidal Interval Type-2 Fuzzy environment. In addition, two methods, Interval Type-2 Fuzzy Payback Period (IT2FPP) and Interval Type-2 Fuzzy Profitability Index (IT2FPI), were developed for the first time in the literature by integrating Interval Type-2 Fuzzy with traditional methods. These methods were then successfully applied to a real case study of ship investment for evaluation in the shipping industry in an uncertain environment.