درخت حوزه‌های تخصصی

Purpose: Considering the importance of sports service small businesses in creating a competitive advantage in this field, the present research was conducted with the aim of providing a framework of analyzing the effective factors on the success of small businesses of sports service. Methodology: This research in terms of purpose was applied and in terms of implementation method was qualitative. The statistical population of the current study was all active managers and experts in small businesses of sports services, which number of 16 people of them were selected as a sample according to the principle of theoretical saturation and with the purposive sampling method. The tool of the current research was a semi-structured interview, which its validity was confirmed by triangulation method and its reliability was obtained by Cohen's kappa coefficient method 0.803 and the data obtained from its implementation were analyzed by open, axial and selective coding method in MAXQDA software. Findings: The findings showed that for the effective factors on the success of small businesses of sports service were identified 81 indicators, 23 components and 8 dimensions. The dimensions were included environmental (with three components of government support, legal environment and competitive environment), business plan (with three components of capital, information and work force), organization (with two components of suitability of job and employee and business institutional relations), marketing and information (with three components of marketing plans, networking and market orientation), financial affairs and facilities (with four components of budget, economic fluctuations, infrastructure and equipment and facilities), innovation (with three components of innovation in management, innovation in services and innovation in process), models consumption of sports services (with two components of consumption behavior and purchase patterns) and consequences of business success (with three components of commercialization, branding and sports participation). Finally, the pattern of the framework of analyzing the effective factors on the success of small businesses of sports service was drawn. Conclusion: According to the results of this study, the success of small businesses of sports service depends on many factors. Therefore, in order to achieve success in small businesses of sports service, it is possible to provide the basis for improving the identified indicators, components and dimensions in the current research.

Purpose: Today, the use of online education significantly has grown in compared to the past. Therefore, the aim of this study was to determine the effect of components of the field of artistic aesthetics on online education. Methodology: The present study in terms of purpose was practical and in terms of implementation method was interventional with a pretest, posttest and one-month follow-up design. The research population was the fourth grade students of district 2 of Tehran city in the 2021-22 academic years. The number of 50 people of them were selected by cluster sampling method and randomly replaced into two experimental and control groups. The experimental group was trained for one month from Saturday to Wednesday in the field of artistic aesthetics in Skyroom, and the control group was trained with the usual method in Skyroom. The research tool was a researcher-made online education questionnaire with 13 items, which the face validity by the opinion of experts was confirmed, and its reliability with the test-retest method was obtained above 0.80. The data were analyzed by methods of variance analysis with repeated measurements and Bonferroni post hoc test in SPSS version 19 software. Findings: The findings of the present research showed that teaching the components of the field of artistic aesthetics led to increase all variables of online education including music and sound, dramatic movements, imagery, visual arts, digital media and film, animation, storytelling and narrative, recognition of colors and lines, poetry and text, pantomime, rhythmic story writing, humor and puppet shows were improved in students and these results remained in the one-month follow-up phase (P<0.05). Conclusion: The results showed the effect of the intervention based on the components of the field of artistic aesthetics on all variables of online education. Therefore, can be used the method of teaching the components of the field of artistic aesthetics along with other educational methods to improve online education.

As a trading strategy, pairs trading is performed based on the arbitrage opportunities extracted from statistical models. It is an outcome of the distance between an asset pair and the equilibrium state. Consequently, selecting a pair with the potential to form long-term relationships and reverting to the mean is the main challenge associated with pair trading. Cointegration is one of the most famous statistical tests for selecting a pair's trading. The present study uses Empirical Mode Decomposition (EMD) to decompose the time series of an asset pair price into its constituent elements (intrinsic mode functions). This study examined the property of cointegration across different levels and the corresponding levels of 2- time series to find the cointegration pairs in different decomposition levels and finally examine the resulting profitability. To this end, the profitability of the pairs trading system related to 14 stocks of the Tehran Stock Exchange throughout 2012-2021 was investigated based on EMD. The results showed that the outputs are pretty noticeable for the first level of decomposition (the first intrinsic mode function), and the number of trading opportunities increased by more than two times compared to the normal pair trading with cointegration; the daily returns increased by four times; and the Sharpe ratio increased by about two times compared to the normal pairs trading. The system formed based on the second mode function also outperformed the normal cointegration, and the performance of the third intrinsic mode function is almost on par with that of cointegration. Moreover, the mean transaction duration decreased remarkably in the first and second mode functions.