درخت حوزه‌های تخصصی

One of the most important aspects of investment is determining the “optimal investment portfolio”. To date, scientific research has been conducted to determine the optimal portfolio with “artificial intelligence” and “Fuzzy logic”. However, we determine the optimal portfolio based on Dynamic Stochastic General Equilibrium (DSGE) model. On the other hand, several factors affect returns, which is one of the most important issues in investment decision-makings, and various models have been developed to analyze the return of “capital” and “other assets”. In this regard, some of the most important models include linear and non-linear models, artificial neural network models, Fama–French model, Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) model, and optimal stable model. All of these models are indicative of the use of quantitative methods and models in the investment industry. One of the causes of using these models is developing the financial economy. In fact, the development of financial economy has more increased with the concept of “portfolio optimization”. In fact, the portfolio optimization and diversification concept is the basis of developing and expanding classical finance and financial decision-making. Financial markets, especially the capital market, can have a great deal of relevance to other sectors of the economy. In the present study, we design and calibrate a new Keynesian DSGE model in relation to the optimal investment portfolio and effectiveness of shocks (e.g., productivity and foreign exchange earnings fluctuation) on macroeconomics variables.

In this paper, based on the verses of Quran and the traditions related to the supreme leader, it is about the supreme leader’s jurisdiction. This is important because the theory of supreme leader is one of the most important achievements of political thought driven from Shia school that is stemmed in the verses and cabbalas. The theory of supreme leader has a long history among jurists and amongst no one has been denied the supreme leader, but the jurisdiction of the supreme leader in occultation has been debated and it raised questions and doubts. Today, in this sense, the Islamic Republic of Iran on the basis of the theory of supreme leader has been led and establishing the principle of supreme leader in the constitution and the objectification on the community, it is of special significant to discuss the jurisdiction; hence, the analysis of the jurisdiction of the supreme leader is also a topic that can be investigated using verses and cabbalas. This paper, by explaining the Quran’ view and cabbalas on the authority of the supreme leader, investigates the issue.

The neighborhood has had a long history in Iranian urbanization. Since urban plans were introduced by the authorities to shape urban development in Iran half a century ago, the concept of Iranian traditional neighborhood has been neglected gradually. The concept of neighborhood has not found the appropriate status in urban design and planning yet. One of the main reasons is that academics, professional urban planners, designers and managers use different definition and no consensus exists on definition of neighborhood. The aim of research is to compare residents’ perception of their neighborhood boundaries with boundaries of administrative-defined Neighborhoods which municipalities consider. The main hypothesis of the research is fundamental difference between these two views: top- down view from experts and urban managers who see the neighborhood as a spatial unit for city organizing and bottom- up view from residents who consider the neighborhood as the place of their social life. The Research methodology has been done base on the survey method and an analytical approach has been applied. The case study is located in Mashhad city in Iran. Four municipality-defined neighborhoods were selected in various urban fabrics of the city. Findings indicate that residents’ definition of their neighborhood was influenced by socio-spatial factors and interaction of these on each other. There is a substantial and fundamental difference between residents’ definition of neighborhood and municipality-defined neighborhood. Finally, this study proposes recommendations for the better definition of administrative neighborhoods in Iran.