Implementation credit rating for Corporates is influenced by Different circum-stances, systems, processes, and cultures in each country. In this study, we pro-posed a Factor analysis modified approach for determine important factors on real data set of 123 accepted corporate in Tehran Securities Exchange for the years 2009-2017 of diverse range of 52 variable. We estimated the priority score for 49 factors. The three factors, Debt to Equity Ratio, Current debt-to-equity ratio and proprietary ratio exclude due to high correlation with others. The results indicated that three macroeconomic factors: Price Index of Consumer Goods and Services, exchange rate and Interest rate determinants were more effective on the credit ratings. In addition, Financial Ratios and non-Financial Ratios such as Return on equity (ROE), Long-term debt-to-equity ratio, Benefit of the loan, ratio of com-modity to working capital, Current capital turnover, Return on Working Capital, Quick Ratio, Current Ratio, Net Profit margin, Gross profit margin, had effect on credit rating accepted corporate in Tehran Securities Exchange. The Nonparametric statistical test to validate the consistency between AHP ranking and Factor analysis revealed, the new approach has a moderated consistency with AHP. In conclusion, the Factor analysis modified approach could be applied significantly to evaluate efficiency and ranking factors with minimum loss of information. پرونده مقاله

In this paper, using Evolutionary Game Theory, we study the evolution of currency as an important and influential problem in the world economy by presenting three new models. In examining the evolution of two different currencies, we prove that if the parties chose either of the two currencies with a fixed probability, it will not have an impact on the evolutionary process of these currencies. Considering a new action based on either the possibility of using any two currencies or a preference between the two currencies, we illustrate their impact on the evolution-ary process of currencies. In fact, we examine the impact of different actions and strategies on the evolutionary process between the two types of currencies. پرونده مقاله

In this paper, we investigate the generalized Hyers-Ulam-Rassias and the Isac and Rassias-type stability of the conditional of orthogonally ring $*$-$n$-derivation and orthogonally ring $*$-$n$-homomorphism on $C^*$-algebras. As a consequence of this, we prove the hyperstability of orthogonally ring $*$-$n$-derivation and orthogonally ring $*$-$n$-homomorphism on $C^*$-algebras. پرونده مقاله

In this paper, we introduce the $ b-(\varphi, \Gamma)-$graphic contraction on metric space endowed with a graph so that $(M,\delta)$ is a metric space, and $V(\Gamma)$ is the vertices of $\Gamma$ coincides with $M$. We aim to obtain some new fixed-point results for such contractions. We give an example to show that our results generalize some known results. پرونده مقاله

در این مقاله، یک تحلیل استراتژیک برای کشته شدن رستم در شاهنامه با رویکرد نظریه بازی‌ها ارائه شده است. در نگاه اول، استراتژی حکیم فردوسی استخراج می‌شود که با کشته شدن رستم در شاهنامه نمی‌خواهد به شاعران قرن‌های آینده سواری رایگان بدهد. بازی فردوسی و شاعران آینده یک بازی ترتیبی ایستای اکید می‌باشد که با استفاده از جدول اطلس نظریه بازی‌های 2×2 مدل سازی می‌شود. در نگاه دوم، بازی شغاد و رستم با استفاده از مدل بازی‌های استراتژیک، پس از طراحی استراتژی‌های بازیکنان، عایدی‌های آنان در موقعیت‌های مختلف با توجه به محیط بازی محاسبه و تحلیل شده است. این بازی 2×2 یکی از بازی‌های ترتیبی ایستا اکید و بازی هژمونی می‌باشد. با توجه به جدول این بازی، بازیکن P_1 (شغاد) که برای فریب بازیکن P_2 (رستم) از شرایط بازی استفاده می‌کند و بازی را طوری پیاده سازی کرد تا به خواسته خود برسد. یکی از مهم ترین نتایج این مقاله، اثبات ژرف اندیشی تفکر راهبردی فردوسی است که به عنوان یک استراتژیست مطرح و بررسی شده است.

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