حمزه محمدی خشوعی

The existence of bubbles in the market, especially the capital market, can be a factor in preventing the participation of investors in the capital market process and the correct allocation of financial resources for the economic development of the country. On the other hand, due to the goal of investors in achieving a portfolio of high returns with the least amount of risk, the need to pay attention to these markets increases. In this research, with the aim of maximizing return and minimizing investment risk, an attempt has been made to form an optimal portfolio in conditions where the capital market has a price bubble. According to the purpose, the research is of applied type, and in terms of data, quantitative and post-event, and in terms of type of analysis, it is of descriptive-correlation type. In order to identify the months with bubbles in the period from 2015 to 2021 in the Tehran Stock Exchange market, sequence tests and skewness and kurtosis tests were used. After identifying periods with bubbles, the meta-heuristic algorithms were used to optimize the portfolio. The results indicate the identification of 14 periods with price bubbles in the period under study. Also, in portfolio optimization, selected stock portfolios with maximum returns and minimum risk are formed. This research will be a guide for investors in identifying bubble courses and how to form an optimal portfolio in these conditions.

This study aimed to develop an internal control model for the Iranian Social Security Organization with a risk management approach. This exploratory study is applied in terms of objective, and the statistical population comprised 340 employees in the financial department of the Iranian Social Security Organization. The data was collected using interviews and questionnaires, and the hypotheses were tested with inferential statistics and structural equation tests. The results showed that the internal control factors of the Iranian Social Security Organization include the income bank system, the legal obligations system, compensation, the financial bookkeeping system, the movable and immovable property system, the financial management system, and check issuance requirements. The results also showed that the factors affecting internal controls are among the factors influencing risk management. Considering the extent of branches, dimensions, various services including (retirement, disability) and the size and volume of financial operations, as well as the very high budget of the Social Security Organization (for example, in 1401, the budget of the Social Security Organization is 500 thousand billion Rials), there are many factors on the controls Empty and effective risk management. The most important factors affecting the Social Security Organization's internal controls' efficacy are the financial bookkeeping system, Payroll system, And Legal requirements for issuing checks.