沉浸互动模型:滑雪消费心流体验机制的质性研究     

翁银  李凌 《成都体育学院学报》2020,(2):78-84

刺激滑雪消费增长与促进滑雪产业发展是当今的热点议题。本研究引入心流体验与心流体验机制理论,探索滑雪消费心理特征与滑雪可持续消费心理模型。从微观消费心理视角切入,运用扎根理论质性研究手段,采取深度访谈与焦点团体访谈相结合的访谈技术,经"三级诠释"逻辑分析的过程,构建了滑雪消费心流体验机制的理论模型。结果显示:本研究共提取了滑雪消费心流体验机制的102个概念、36个范畴、4个主范畴,基于扎根理论故事线逻辑梳理并构建了"沉浸互动机制"质性模型。基于此,为提升本研究的理论可靠性,采用模型识别比较分析,检验本研究质性模型的创新性与科学性,为促进滑雪产业可持续发展提供相关理论参考。  相似文献   

Autism spectrum disorder assessment and evaluation research in 10 school psychology journals from 2007 to 2017          下载免费PDF全文

Maryellen Brunson McClain  Tiffany L. Otero  Cassity R. Haverkamp  Fiona Molsberry 《Psychology in the schools》2018,55(6):661-679

School psychologists are increasingly engaged in service provisions for students eligible for special education services under the eligibility category of autism, including conducting school‐based assessments and evaluations. Evaluations occur for a variety of reasons such as special education eligibility decision‐making, treatment and intervention planning, and progress monitoring. Publications in school psychology journals emphasizing autism spectrum disorder (ASD) assessment and evaluation are vital to quality training and practitioner utilization of quality practices. In the current study, researchers conducted a systematic review of publicaftions in 10 school psychology journals from 2007 to 2017 to assess the current state of ASD assessment and evaluation research in the field of school psychology. Implications for researchers, trainers, and practitioners are discussed.  相似文献   

Optimal synchronization controller design for complex dynamical networks with unknown system dynamics     

Ya-Wei Cao  Guang-Hong Yang  Xiao-Jian Li 《Journal of The Franklin Institute》2019,356(12):6071-6086

In this paper, the optimal synchronization controller design problem for complex dynamical networks with unknown system internal dynamics is studied. A necessary and sufficient condition on the existence of the optimal control minimizing a quadratic performance index is given. The optimal control law consists of a feedback control and a compensated feedforward control, and the feedback control gain can be obtained by solving the well-known Algebraic Riccati Equation (ARE). Especially, in the presence of unknown system dynamics, a novel adaptive iterative algorithm using the information of system states and inputs is proposed to solve the ARE to get the optimal feedback control gain. Finally, a simulation example shows the effectiveness of the theoretical results.  相似文献   

Intermittent control strategy for synchronization of fractional-order neural networks via piecewise Lyapunov function method     

Ying Yang  Yong He  Min Wu 《Journal of The Franklin Institute》2019,356(8):4648-4676

In this paper, the synchronization problem of fractional-order neural networks (FNNs) with chaotic dynamics is investigated via the intermittent control strategy. Two types of intermittent control methods, the aperiodic one and the periodic one, are applied to achieve the synchronization of the considered systems. Based on the dynamic characteristics of the intermittent control systems, the piecewise Lyapunov function method is employed to derive the synchronization criteria with less conservatism. The results under the aperiodically intermittent control show more generality than the ones via the periodically intermittent control. For each of the aperiodic and periodic cases, a simple controller design process is presented to show how to design the corresponding intermittent controller. Finally, two numerical examples are provided to demonstrate the effectiveness of the obtained theoretical results.  相似文献   

精英运动员运动损伤的心理预防： 理论模型和研究展望          下载免费PDF全文

徐建清 《河北体育学院学报》2019,33(6):78-85

为有效预防竞技运动损伤，促进业界重视心理因素在预防损伤中的作用，对国外竞技运动损伤心理预防的概念模型和框架进行梳理，发现各类心理因素对发生运动损伤的影响路径被进一步整合和细化，不同水平层次的社会心理学因素开始受到重视，无论是特质理论还是应激—损伤理论、行动理论、状态理论，都强调了压力反应这一重要变量，全面、多方位考察风险文化和行为以及生物心理社会因素互动的理论视角是该主题未来的趋势。未来需要规范运动损伤的定义和测量方法，有必要开展运动员及其有关情况的针对性调查，还应该注重重复测量研究设计以及使用被忽视的结构方程模型检验变量的中介效应。  相似文献   

Linear output-feedback-based semi-global stabilization for switched nonlinear time-delay systems     

Zhenhua Li  Lijun Long  Jun Zhao 《Journal of The Franklin Institute》2019,356(13):7224-7245

This paper focuses on the problem of semi-global output-feedback stabilization for a class of switched nonlinear time-delay systems in strict-feedback form. A switched state observer is first constructed, then switched linear output-feedback controllers for individual subsystems are designed. By skillfully constructing multiple Lyapunov–Krasovskii functionals and successfully solving several troublesome obstacles, such as time-varying delay and switching signals and nonlinearity in the design procedure, the switched linear output-feedback controllers designed can render the resulting closed-loop switched system semi-globally stabilizable under a class of switching signals with average dwell time. Furthermore, under some milder conditions on nonlinearities, the semi-global output-feedback stabilization problem for switched nonlinear time-delay systems is also studied. Simulation studies on two examples, which include a continuous stirred tank reactor, are carried out to demonstrate the effectiveness of the proposed approach.  相似文献   

Multi-lagged-input iterative dynamic linearization based data-driven adaptive iterative learning control     

Na Lin  Ronghu Chi  Biao Huang  Zhongsheng Hou 《Journal of The Franklin Institute》2019,356(1):457-473

This article presents a multi-lagged-input based data-driven adaptive iterative learning control (M-DDAILC) method for nonlinear multiple-input-multiple-output (MIMO) systems by virtue of multi-lagged-input iterative dynamic linearization (IDL). The original nonlinear and non-affine MIMO system is equivalently transformed into a linear input-output incremental counterpart without loss of dynamics. The proposed learning law utilizes the desired trajectory to cancel the influence from iteration-by-iteration variations, as well as additional multi-lagged inputs to improve control performance. The developed iterative estimation law is more effective and also makes estimation of the unknown parameters easier because the dynamics for each parameter to represent are decreased by dividing the system into multiple components in the multi-lagged-input IDL formulation. Moreover, the proposed M-DDAILC does not need an explicit and accurate model. It is proved to be iteratively convergent with rigorous analysis. Both a numerical example and a practical application to a permanent magnet linear motor are provided to verify the validity and applicability of the proposed method.  相似文献   

Dynamics of a stochastic multigroup SIQR epidemic model with standard incidence rates     

Qun Liu  Daqing Jiang  Tasawar Hayat  Ahmed Alsaedi 《Journal of The Franklin Institute》2019,356(5):2960-2993

In this paper, we consider a stochastic multigroup SIQR epidemic model with standard incidence rates. By using the stochastic Lyapunov function method, we establish sufficient conditions for the existence of a stationary distribution of the positive solutions to the model. Then we establish sufficient conditions for extinction of the diseases. A stationary distribution means that all the individuals can be coexistent and persistent in the long term. Finally, some examples and numerical simulations are introduced to illustrate our theoretical results.  相似文献   

The effect of smartphones and playing video games on decision-making in soccer players: A crossover and randomised study     

Leonardo S. Fortes  Dalton De Lima-Junior  Lenamar Fiorese  José R. A. Nascimento-Júnior  Arnaldo L. Mortatti  Maria E. C. Ferreira 《Journal of sports sciences》2020,38(5):552-558

ABSTRACT

The objective of this study was to analyse the effect of the use of social networks in smartphones or playing video games on the passing decision-making performance in professional soccer athletes. Participants were 25 male professional soccer athletes (mean ± SD: age 23.4 ± 2.8 years). The participants performed three randomised conditions divided into three groups: control (CON), smartphone (SMA), and video game (VID). Before and after each experimental condition, the Stroop Task assessed the level of induced mental fatigue. Then, the athletes performed a simulated soccer match. A CANON® camera recorded the matches for further analysis on passing decision-making performance. A group effect was identified (p < .01) with impairment on passing decision-making performance for the SMA (p = .01, ES = 0.5) and VID (p = .01, ES = 0.5) conditions. We concluded that the use of social networks on smartphones and/or playing video games right before official soccer matches might impair the passing decision-making performance in professional soccer athletes.  相似文献   

改革开放40年高等体育教育资源优化配置的社会学审视     

张孔军  钱娅艳 《北京体育大学学报》2019,42(2):103-114

摘要：我国高等体育教育资源优化配置研究引入社会学视角理论与方法，理论与实践均取得专家的认同。运用文献资料法、专家访谈法和实地考察法等方法发现，在计划经济体制下我国高等体育教育资源配置主体单一性、手段行政化和政治倾向性强，凸显出高等体育教育资源配置缺乏激励机制和市场竞争机制的问题，造成高等体育教育资源配置成本最大化和社会效应的最小化问题较多。自改革开放以来,随着我国市场经济体制的建立为高等体育教育资源优化配置提供了难得的发展机遇，我国高等体育教育资源配置取得了明显成效，但仍然存在高等体育教育资源配置机制滞后、体制机制改革创新步伐缓慢、高等体育教育资源配置不合理以及民办普通高校体育教育资源配置严重不足等问题。据此，从社会学研究的视角，提出了构建多主体推动高等体育教育资源优化配置创新的发展模式、多元化高等体育教育资源优化配置资金投入的保障体系、高等体育教育资源优化配置均衡发展的运行机制和大学城体育教育资源“共建共享”的创新发展模式的新时代我国高等体育教育资源优化配置的发展策略，旨在服务新时代全民健身与全民健康深度融合发展，“推动构建人类命运共同体”发展目标的实现。  相似文献