درخت حوزه‌های تخصصی

Psychological variables that affect mental health are divided into useful and harmful variables. Useful variables are beneficial for improving mental health and quality of life, and increasing well-being, for instance, happiness, calmness, vigor, and mental toughness. Harmful variables reduce mental health, quality, and enjoyment of life, for example, negative mood states, anxiety, and burnout. This study aimed to predict psychological burnout based on mood states and mental toughness of elite athletes with physical disabilities. Participants have included 150 athletes with physical disabilities (77women; 73men) competing at national or international Paralympic sports teams (mean age=42.34 ±7.44y, mean experience=8.38 ± 3.19 y) that were selected in the random method. Participants accomplished the Athlete Burnout Questionnaire, the 32-item Brunel Mood Scale, and the Sports Mental Toughness Questionnaire. Stepwise multiple linear regression analysis showed that happiness (moderate negative power, 51%), vigor (weak negative power, 28%), fatigue (weak positive power, 22%), mental toughness (medium negative power, 57%), and confidence (weak negative power, 29%) were able to predict the total burnout of the athletes with disabilities. These findings are essential for psychologists since developing and increasing the useful variables and inhibiting or decreasing the harmful variables for mental health can prevent sports burnout.

Introduction: This study was conducted to control hand tremors and decrease adverse effects due to the high field intensity in advanced Parkinson’s disease. We aimed at concurrently controlling two areas of Basal Ganglia (BG) in a closed-loop strategy.Methods: In the present research, two nuclei of BG, namely subthalamic nucleus and globus pallidus internal were simultaneously controlled. Furthermore, to enhance the feasibility of the suggested control strategy, the coefficients of the controller were determined using a hybrid version of the harmony search and cuckoo optimization algorithm. Results: The advantages of the applied method include decreasing hand tremors and applied electric field intensity to the brain; consequently, it leads to reducing adverse effects, such as muscle contraction and speech disorders. Moreover, the purposed controller has achieved superior performance against changing the parameters of the model (robustness analysis) and under noise tests, compared to other conventional controllers, such as Proportional Integrator (PI) and Proportional Derivative (PD).Conclusion: The employed approach provided an effective strategy to reduce hand tremors. It also decreased the delivered high field intensity to the brain; consequently, it reduced adverse effects, such as memory loss and speech disorders. It is important to ascertain the superior performance of the suggested closed-loop control scheme in different conditions and levels of tremor. Such a function was examined in terms of robustness against the variation of parameters and uncertainties. We also obtained time domain outcomes, i.e., compared with the state-of-the-art approaches.

The purpose of this study was to investigate the situation of football refereeing in Iran using the SOAR framework. The method of the present study was descriptive-analytical with an applied nature. The SOAR analytical technique was used to collect information from interviews and form focus groups, formulate a development strategy and explain the strengths, opportunities, aspirations, and measurable results. The study's statistical population included all national and international football referees in the country, and the sample was purposefully selected (n=151). The research instrument was based on an exploratory study and rewriting of basics, interviews, and similar studies by the researcher, whose content validity was confirmed by experts, and its reliability was confirmed by Cronbach's alpha (α=0.89). The results showed that the existence of many interested in football refereeing, the great interest of Iranian youth in football refereeing, the establishment of national and international refereeing courses, and the emergence of Iranian referees in the first place in Asia, respectively the most critical priorities in terms of strengths, opportunities, aspirations, and results. According to the findings, to improve refereeing at the global level, it is necessary to formulate a strategic plan based on the brand-based model that can align all the potentials in the country with its overall refereeing goal.