درخت حوزه‌های تخصصی

one of the most important financial and investment issues is Portfolio selection, that seeks to allocate a predetermined capital (wealth) over one or multiple periods between assets and stocks in such a way that the wealth of investor (portfolio owner) is maximized and, Simultaneously, its risk minimized. In the paper, we first propose a mathematical programming model for Portfolio selection to maximize the minimum amount of Sharpe ratios of the portfolio in all periods (max-min problem). Then, due to the uncertain property of the input parameters of such a problem, a robust possibilistic programming model (based on necessity theory) has been developed, which is capable of adjusting the robust degree of output decisions to the uncertainty of the parameters. The proposed model was tested on 27 companies active in the Tehran stock market. In the end, the results of the model demonstrated the good performance of the robust possibilistic programming model. 

This review article examines the underpinning of the little-researched, influential elements that create linguistic injustice in the specific contexts of linguistic imperialism through standardization. To this end, with a review of critical views that includes argumentation and discussion of theoretical and empirical studies, we further aim to highlight linguistic injustice in writing for publishing. The domination of the English language as a lingua academia has not happened neutrally and can create unjust and unequal situations. In knowledge construction, the prosperity of researchers and academics is tied to international publication, and this action supports globalization, individualism, and standardization in favor of native English users. The domination of the English language in academic settings may be a hegemonic practice of native Anglophones to maintain power.  In this review, we underline the possibilities for privileged communities to pinpoint linguistic inequality and injustice.  The nature of academia should be liberal and liberating; however, in reality, academic settings are politically partisan and at the service of the powerful and wealthy. Still, there is slim hope that the system can change, and one of such profound changes may happen with equal access to resources and mentors for marginalized communities. In this case, the minorities’ voices may also be heard and respected globally.