uncertainty
Iman Ebrahimi; Hadi Mokhtari; Mohammad Taghi Rezvan
Abstract
The cryptocurrency market, known for being one of the most volatile financial markets, has recently attracted significant attention. While some investors avoid entering this market due to fear of losses, others are eager to pursue substantial profits. This research employs scientific analysis and advanced ...
Read More
The cryptocurrency market, known for being one of the most volatile financial markets, has recently attracted significant attention. While some investors avoid entering this market due to fear of losses, others are eager to pursue substantial profits. This research employs scientific analysis and advanced models to examine the characteristics of this market. In the first phase, the focus is on portfolio formation in the cryptocurrency market based on relevant indicators. After evaluating the created portfolio, Markowitz, Sharpe and Sortino models are utilized for portfolio optimization. This approach allows for the creation of a portfolio that aligns with individual risk preferences, and passive portfolio management is also considered. In the second phase of the research, equal-weighted portfolios were formed alongside a market portfolio, and nine other selected portfolios were chosen based on criteria such as highest market value and best risk-return ratio. A particle swam optimization algorithm was employed to assess the performance of these portfolios. The results indicate that portfolios containing cryptocurrencies with the highest market value exhibit lower risk, and the Sharpe optimization model outperforms other models. Additionally, selecting a portfolio based on the standard deviation of return-to-risk ratio yields more favorable outcomes. This study also presents an innovative method for analyzing the coefficient of variation, leading to a better understanding of the relationship between return and risk. Ultimately, the findings emphasize that utilizing scientific trading strategies can facilitate risk management and enhance returns.
multiple-criteria decision-making
Ali Memarpour Ghiaci; morteza abbasi; Jafar Gheidar-Kheljani
Abstract
Suppliers evaluation plays a pivotal role in the success of modular megaprojects, as these projects require capable suppliers due to the necessity for complex coordination among various subsystems and the precise integration of modules. This study proposes an integrated framework for the evaluation of ...
Read More
Suppliers evaluation plays a pivotal role in the success of modular megaprojects, as these projects require capable suppliers due to the necessity for complex coordination among various subsystems and the precise integration of modules. This study proposes an integrated framework for the evaluation of suppliers in modular megaprojects. For the first time, this research applies a novel integrated approach based on the LOPCOW and ARTASI methods, extended using spherical fuzzy sets (SF-LOPCOW and SF-ARTASI) for supplier evaluation. Based on this approach, 31 sustainability-oriented criteria have been identified for evaluating suppliers in modular megaprojects. The criteria are first weighted using the SF-LOPCOW method. Subsequently, in a case study, 12 suppliers identified for a modular megaproject are evaluated and prioritized using the SF-ARTASI method. A comparison of the SF-ARTASI results with other existing multi-criteria decision-making methods in the literature, along with a sensitivity analysis, demonstrates the effectiveness of the proposed approach and the robustness of its results under different scenarios.
