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451.
The paper investigates the consensus problem for multi-agent systems with randomly occurring nonlinear dynamics and time-varying delay. A novel event-triggered scheme has been proposed, which can lead to a significant reduction in information communication in a network. By utilizing stochastic analysis and properties of the Kronecker product, consensus criteria are derived in the form of linear matrix inequalities, which can be readily solved using the standard numerical software. Finally, an illustrative example is used to show the effectiveness of the event-triggered scheme. 相似文献
452.
453.
Beliefs about mathematics education and their influences on teaching practices have been widely investigated in recent decades. There have been numerous empirical studies on the influences of religions on teachers’ and students’ beliefs about subjects such as sciences and language. However, the influences of worldviews in general and religions in particular, as one of the major sources of beliefs in relation to mathematics education, are under-researched. The current study is a first step to unpacking the relationship between teachers’ religions and their beliefs about mathematics teaching and learning. By means of semi-structured interviews with mathematics teachers of different religious backgrounds, teachers’ perceptions on the connection between their personal religious beliefs and their beliefs about teaching and learning are investigated. In-depth analyses of the perceptions of three mathematics teachers reveal the complex relationship between teachers’ religious beliefs and their teaching beliefs. First, there are some common values shared by different religions, which influence the beliefs about mathematics teaching and learning as well as education in general. Second, religion is a rich belief system, and the teachers appear to apply only a portion of their religious beliefs to guide their teaching. It is also possible that a teacher is influenced by more than one religion or cultural tradition. Despite its subtleties, our study provides evidence to support the alignment between teachers’ personal religious beliefs and their beliefs about mathematics teaching and learning. 相似文献
454.
Young people’s aspirations remain an enduring focus of education policy interest and concern. Drawing on data from an ongoing five-year study of young people’s science and career aspirations (age 10–14), this paper asks what do young people aspire to at age 12/13, and what influences these aspirations? It outlines the main aspirations and sources of these aspirations as expressed by young people in England in the last year of primary school (survey of 9000+ Y6 pupils, aged 10/11, interviews with 92 children and 76 parents) and the second year of secondary school (survey of 5600+ Y8 pupils, aged 12/13, interviews with 85 pupils). We demonstrate how aspirations are shaped by structural forces (e.g. social class, gender and ethnicity) and how different spheres of influence (home/family, school, hobbies/leisure activities and TV) appear to shape different types of aspirations. The paper concludes by considering the implications for educational policy and careers education. 相似文献
455.
Jocelyn L. N. Wong 《Asia Pacific Education Review》2010,11(2):131-139
The concept of “professional learning community” (PLC) has been suggested as a tool to improve teachers’ professional competency
and students’ learning outcomes since the mid-1990s. In such a community, teachers can share their individual practices with
the aim of searching for “good practice” based on the outcome of collective inquiry. Such a learning process will result in
a reculturing of the school community by reshaping the existing values and cultures and resolving problems such as teacher
isolation and individualism. China already has a long tradition of teachers working and learning collaboratively, so investigating
collaborative efforts in this context may provide a view of how to contextualize professional development of teachers in schools.
This study attempts to access teachers’ lenses in order to explore their views on the effects of subject-based professional
learning activities. This also helps to explain how teachers work and openly share their practices aiming at improving their
professional competency and student learning outcomes within their communities. Also, factors influencing the sustainability
of a professional learning community will be discussed. 相似文献
456.
457.
Pak Kin Wong Xiang Hui Gao Ka In Wong Chi Man Vong 《Journal of The Franklin Institute》2018,355(4):1517-1538
Modern engines are controlled by electronic control units, which operate all the engine actuators based on the signals from various sensors in the engine. Traditionally, the control parameters of the actuators are obtained through huge amount of trial-and-error experiments. However, using traditional approach to calibrate these parameters becomes more challenging with the increasing incorporation of new technologies into advanced engines. In order to reduce the number of experiments required in the calibration process of modern engines, a novel point-by-point engine calibration approach based on machine learning methods is proposed in this study. It is an iterative procedure that, for a given operating point, sequential design of experiment (DoE) strategy is utilized to measure the responses of different engine sensors corresponding to different actuator signals, and a machine learning algorithm called initial-training-free online extreme learning machine is utilized to incrementally learn the relationship between the sensors and actuators based on the measurement acquired. In each iterative cycle, meta-heuristic optimization is performed on the machine-learning-based model to search for the best parameters, which are then used as the initial parameters for generating DoE plan of the next cycle. The iteration is repeated until the optimal parameters of that operating point are found. To verify the effectiveness of the proposed approach, experiments on both simulation engine in commercial software and real engine in test bench have been conducted. The results show that the engine calibration can be carried out with significant fewer experiments and time by using the proposed approach. 相似文献
458.
Qipeng Song Shen Wang Del P. Wong Jingyi Zhou Wei Sun Cui Zhang 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(3):402-413
The effects of long-term Tai Chi exercise on body stability of the elderly during stair ascent under high and low illumination were investigated. Forty-five healthy elderly women were divided into three groups, namely, Tai Chi exercise group, brisk walking group and no-exercise control group. All the participants ascended a staircase, during which force platforms and a motion capture system collected the data. Under the high illumination, Tai Chi exercise participants exhibited higher loading rate and anteroposterior centre of pressure (COPap) displacement as well as a lower braking impulse than no-exercise group. Under the low illumination, Tai Chi exercise participants demonstrated higher COPap and mediolateral centre of pressure (COPml) displacements as well as lower braking and lateral impulses compared with no-exercise participants. The centre of mass (COM)ml sway in Tai Chi and no exercise participants were higher, the loading rates in Tai Chi and walking participants were higher, and the lateral impulse in no exercise participants was higher under low illumination than under high illumination. Thus, low illumination increases the risk of falling. Tai Chi participants increased their foot clearance, head inclination angle and COPap displacement under low illumination to increase their stability during stair ascent. 相似文献
459.
Agnes S.K. Wong Matthew Moreno Samantha Burns Earl Woodruff 《Journal of Research in Reading》2023,46(2):143-162