List of Articles Ultra-innovative algorithm Open Access Article Abstract Page Full-Text 1 - Stock portfolio optimization based on the combined model of omega ratio and mean-variance Markowitz based on two-level ensemble machine learning sanaz faridi Mahdi Madanchi Zaj amir daneshvar shadi shahverdiani fereydoon rahnama 10.30495/jfksa.2022.21083 Open Access Article Abstract Page Full-Text 2 - Designing a closed-loop green supply chain in the face of competitive demand and product pricing simultaneously using the frog jump algorithm Mojtaba Ramazani rasul nasrollahi saeedlo Open Access Article Abstract Page Full-Text 3 - Designing a Closed-loop Green Supply Chain in the Face of Competitive Demand and Product Pricing Simultaneously Using the Frog Jump Algorithm Mojtaba Ramazani rasul nasrollahi saeedlo