排序方式： 共有44条查询结果，搜索用时 46 毫秒
21.
This paper deals with the interval type-2 (IT2) fuzzy tracking control problem for nonlinear networked control systems with unreliable communication links. The plant is described by an IT2 fuzzy system, and the IT2 fuzzy sampled-data tracking controller is designed under the unreliable communication mechanism. By utilizing the Lyapunov theory, the stability demonstration is carried out under the mathematical expectation. The characteristics of membership functions are applied to enhance the stability of the IT2 fuzzy system. With the more sampling information used in the stability analysis, the less conservative sufficient condition is provided based on which a networked tracking controller is designed to ensure the anticipant tracking performance. Finally, the efficiency and the merits of this paper are shown by two simulation examples. 相似文献
22.
This paper is denoted to investigating stability in mean of partial variables for stochastic reaction–diffusion equations with Markovian switching (SRDEMS). By transforming the integral of the trajectory with respect to spatial variables as the solution of the stochastic ordinary differential equations with Markovian switching (SODEMS) and using Itô formula, sufficient criteria on uniform stability in mean, asymptotic stability in mean, uniformly asymptotic stability in mean, exponential stability in mean of partial variables for SRDEMS are first derived. An example is presented to illustrate the effectiveness and efficiency of the obtained results. 相似文献
23.
University Student Satisfaction: An Empirical Analysis 总被引：1，自引：1，他引：0
Michael D. Clemes Christopher E.C. Gan Tzu-Hui Kao 《Journal of Marketing for HIGHER EDUCATION》2013,23(2):292-325
The purpose of this research is to gain an empirical understanding of students' overall satisfaction with their academic university experiences. A hierarchal model is used as a framework for this analysis. Fifteen hypotheses are formulated and tested, in order to identify the dimensions of service quality as perceived by university students, to examine students' overall satisfaction with influential factors such as tuition fees (price) and university image, and to determine the impact of students' overall satisfaction on favourable future behavioural intentions. Students' perceptions of these constructs are compared using demographic factors such as gender, age, and ethnicity. Statistical support is found for the use of a hierarchical model, three primary dimensions, and ten sub-dimensions. In addition, the results support a relationship between service quality and price; service quality, image, and satisfaction; and satisfaction and favourable future behavioual intentions. However, there is no statistical support for a relationship between price and satisfaction. The results also suggest that students' perceptions of the constructs are primarily influenced by their ethnicity and year of study. The results of this analysis contribute to the service marketing theory by providing empirically–based insight into satisfaction and service quality constructs in the higher education sector. This study will assist higher education management developing and implementing a market-oriented service strategy, in order to achieve a high quality of service, enhance students' level of satisfaction and create favourable future behavioural intentions. 1 相似文献
24.
San-Fu Kao Chou-Yu Tsai Robert Schinke Jack C. Watson II 《Journal of sports sciences》2013,31(24):2844-2852
ABSTRACTWe draw on the concept of the shared mental model to explain the cross-level direct and moderating effects of team trust on the relationship between coach transformational leadership and cohesion. Using hierarchical linear modelling, we analysed 597 national level high school and university volleyball players to test our research model. Our results revealed that, (a) at the individual level, coach transformational leadership has a positive effect on athletes’ perceptions on cohesion and (b) team trust, a group-level construct, is positively related to social cohesion and moderates the coach transformational leadership-cohesion relationship. The moderating effect demonstrates that the positive effect of coach transformational leadership on cohesion could be enhanced when high levels of team trust are shared within the group. Implications for coach education and sport psychology in terms of theory and research are discussed. 相似文献
25.
A biochip system imitates the oviduct of mammals with a microfluidic channel to achieve fertilization in vitro of imprinting-control-region (ICR) mice. We apply a method to manipulate and to position the oocyte and the sperm of ICR mice at the same time in our microfluidic channel with a positive dielectrophoretic (DEP) force. The positive dielectrophoretic response of the oocyte and sperm was exhibited under applied bias conditions AC 10 Vpp waveform, 1 MHz, 10 min. With this method, the concentration of sperm in the vicinity of the oocyte was increased and enhanced the probability of natural fertilization. We used commercial numerical software (CFDRC-ACE+) to simulate the square of the electric field and analyzed the location at which the oocyte and sperm are trapped. The microfluidic devices were designed and fabricated with poly(dimethylsiloxane). The results of our experiments indicate that a positive DEP served to drive the position of the oocyte and the sperm to natural fertilization (average rate of fertilization 51.58%) in our microchannel structures at insemination concentration 1.5 × 106 sperm ml−1. Embryos were cultured to two cells after 24 h and four cells after 48 h. 相似文献
26.
27.
Yong-Gui Kao Ji-Feng Guo Chang-Hong Wang Xi-Qian Sun 《Journal of The Franklin Institute》2012,349(6):1972-1988
This paper is devoted to investigating the robust stochastic exponential stability for reaction-diffusion Cohen–Grossberg neural networks (RDCGNNs) with Markovian jumping parameters and mixed delays. The parameter uncertainties are assumed to be norm bounded. The delays are assumed to be time-varying and belong to a given interval, which means that the lower and upper bounds of interval time-varying delays are available. Some criteria for delay-dependent robust exponential stability of RDCGNNs with Markovian jumping parameters are established in terms of linear matrix inequalities (LMIs), which can be easily checked by utilizing Matlab LMI toolbox. Numerical examples are provided to demonstrate the efficiency of the proposed results. 相似文献
28.
Achievement modeling is carried out in groups of students characterized by heterogeneous instructional background. Extensions of item response theory models incorporate variables reflecting different amounts of opportunity-to-leam (OTL). The effects of these OTL variables are studied with respect to their influence on both the latent trait and the item performance directly. Such direct effects may reflect instructionally sensitive items. U.S. eighth-grade mathematics data from the Second International Mathematics Study are analyzed. Here, the same test is taken by students enrolled in typical instruction and students enrolled in elementary algebra classes. It is shown that the new analysis provides a more detailed way to examine the influence of instruction on responses to test items than does conventional item response theory. 相似文献
29.
The aim of this study was to explore preschool teachers’ evaluation standards and searching strategies during their online searching process, focusing on the difference between pre-service and in-service teachers. A total of 408 pre-service and in-service preschool teachers in Taiwan participated in the survey research. The validity and reliability of the instruments were confirmed through factor analysis and Cronbach’s alpha. The results showed that the in-service teachers adopted Deep Strategiesand all four kinds of evaluation standards (Multiple, Authority, Content, and Technical) more often than the pre-service teachers did.The results also showed that Internet experience may affect both pre-service and in-service teachers’ use of searching strategies. The findings of this study suggest that more education on online searching strategies as well as evaluation standards should be provided for both in-service and pre-service teachers. 相似文献
30.