Abstract

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.

摘要

投资是公司最重要的因素之一。一家公司在全球竞争激烈的投资不确定性环境中做出的决策（例如在航运业）会对公司的生活产生积极或消极的影响。因此，正确的决策是极其重要的，尤其是在投资不确定的环境中。模糊集理论可用于表示不确定性和模糊性，以在决策问题中生成决策。本研究旨在通过梯形区间类型 2 模糊环境下的净现值 (NPV)、盈利指数 (PI) 和投资回收期 (PP)来评估船舶投资。另外，两种方法，Interval Type-2 Fuzzy投资回收期(IT2FPP) 和区间 2 型模糊盈利能力指数(IT2FPI) 是文献中首次通过将区间 2 型模糊与传统方法相结合而开发的。然后，这些方法成功地应用于船舶投资的真实案例研究，以在不确定的环境中评估航运业。