درخت حوزه‌های تخصصی

In this paper, first, the stochastic differential equations are introduced as well as the definition and basic theories about Monte Carlo and quasi-Monte Carlo and Sobel and Halton sequences are expressed. Indeed, we introduce and use simulations under these methods to compare the efficiency of the solutions, which the results show that the approximation of the resulting Sobel sequence is much better than other stochastic methods. The comparison of the efficiency of random and quasi-random methods, the geometric Brownian movement and the price index of Tehran stock (equal weight and weight-value) is studied. The results show that the quasi-Monte Carlo method is better than other methods.

Purpose: this study has been conducted with the aim of understanding the phenomenon of evading teamwork with a phenomenological approach in the General Department of Cooperation, Labor and Social Welfare of Fars Province. Method: The research method of the present study was conducted with qualitative analysis of hermeneutic phenomenology. In order to collect the data, an interview protocol was prepared. The statistical population included 11 eligible experts who were selected using the purposeful and non-probability sampling method, and in-depth and semi-structured interviews were given to them. Qualitative analysis of phenomenology has been used to identify the main and sub-categories of the research. MAXQDA software was used for qualitative analysis. Findings: The findings showed that 39 sub-categories were identified by examining and categorizing the descriptive codes obtained from the interview texts, according to the seven-step process of Claysey and according to their semantic similarity and affinity, they have been categorized into 7 main concepts including: inadequacy of the educational system, negative personality traits, weak communication and interactions, inappropriate organizational structure, insufficient knowledge and awareness of employees, lack of budget and financial resources, and negative cultural beliefs. Holsti coefficient was used for the final validation, reliability, transferability and verifiability of the data. The value of PAO in the present study was 0.712, which is greater than 0.7, and the data was confirmed. The results show that the categories of inadequacy of the educational system, personality traits, poor communication and interactions, inappropriate organizational structure, insufficient knowledge and awareness of employees, lack of budget and financial resources, and negative cultural beliefs have a direct impact on teamwork.Conclusion: Finally, practical suggestions were presented to the managers of the General Department of Cooperation, Labor and Social Welfare of Fars province to overcome the challenges and problems of teamwork evasion.