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1.
Triggered by different outcomes from the students, the author began to think over the theories and practices of feedback in teaching and learning. So this essay is discussing the purposes and importance of providing feedback to students as well as how to assure an effective feedback. 相似文献
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Since mistakes or errors is an issue of much concern for the teachers and second language acquisition experts implicit feedback and explicit feedback are often used.This study observed a lesson to find which one was used and found the implicit feedback was often available in the form of repetition,then demonstrates its function and assesses its effectiveness in the EFL classroom with the instrument of COLT. 相似文献
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This study aims to find out the effectiveness of corrective feedback on ESL writing.By reviewing and analyzing the previous six research studies,the author tries to reveal the most effective way to provide corrective feedback for L2 students and the factors that impact the processing of error feedback.Findings indicated that corrective feedback is helpful for students to improve ESL writing on both accuracy and fluency.Furthermore,correction and direct corrective feedbacks as well as the oral and written meta-linguistic explanation are the most effective ways to help students improving their writing.However,in dividual learner’s difference has influence on processing corrective feedback.At last,limitation of present study and suggestion for future research were made. 相似文献
4.
We studied the response of harmonically and stochastically excited strongly nonlinear oscillators with delayed feedback bang-bang control using the stochastic averaging method. First, the time-delayed feedback bang-bang control force is expressed approximately in terms of the system state variables without time delay. Then the averaged It6 stochastic differential equations for the system are derived using the stochastic averaging method. Finally, the response of the system is obtained by solving the Fokker-Plank-Kolmogorov （FPK） equation associated with the averaged lt6 equations. A Duffing oscillator with time-delayed feedback bang-bang control under combined harmonic and white noise excitations is taken as an example to illus- trate the proposed method. The analytical results are confirmed by digital simulation. We found that the time delay in feedback bang-bang control will deteriorate the control effectiveness and cause bifurcation of stochastic jump of Duffing oscillator. 相似文献
5.
The paper investigates closed-loop transmit diversity （CLTD） systems with antenna selection technique. The expected received signal-noise-ratio （RxSNR） of the proposed systems is analyzed and compared with CLTD systems. An algorithm is proposed for determining the number of increased transmit antennas in terms of a reduced RF chains without performance degradation. Since a feedback channel is bandwidth-limited, we present a method of quantizing transmit-weight vectors. Simulation results demonstrate advantage of the proposed systems with full and quantized feedback information. Quantized feedback has less effect on the proposed systems than CLTD systems. 相似文献
6.
English language teaching is facing a reformation with the emphasis of students-centered learning approach and communicative language learning. Classroom interaction becomes popular especially during teachers’ oral feedback. In order to involve more students to participate, interactive techniques are applied in the classroom such as elicitation and recasts. This essay will focus on the adoption of interactive techniques in teachers’ oral feedback in terms of a specific grammar lesson and try to explore its impact on students’ participation. 相似文献
7.
This paper presents a new control strategy based on current differential feedback to accelerate the dynamic response of electromagnetic actuators, instead of traditional closed-loop control based on displacement feedback. The method mainly includes a differentiator, proportioner and signal synthesizer. Analysis and simulation on the step characteristics of an electromagnetic actuator were discussed, and all the results show that the approach can improve the actuator＇s step response greatly. Finally, the control method is applied to a real gravure system which verifies the control performance. 相似文献
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The key of speed sensorless vector control system lies in the accurate orientation of magnetic field. In some field-oriented algorithms, the integrator of observers and the dead-time effect bring in system errors during the estimation of field position. In this paper, a saturated feedback integrator is used, and the dead-time effect is compen-sated by current positive feedback. Experiments were carried out on the hardware platform of MCK2407, with chip TMS320LF2407 from TI Company. The results show that the proposed method is simple and effective, and the accuracy of field position is improved. 相似文献
10.
InGuidelines for Language Classroom Instruction,Crookes and Chaudron review research and practice in both second and foreign language contexts.The main areas of classroom instruction described are:presentational modes and focus on form,types of activities and parameters of tasks and interaction,classroom organization,teacher control of interaction,and corrective feedback. 相似文献
11.
Input-output approach to robust stability and stabilization for uncertain singular systems with time-varying discrete and distributed delays 总被引：3，自引：0，他引：3
Based on input-output approach, the robust stability and stabilization problems for uncertain singular systemswith time-varying delays are investigated. The parameter uncertainties are assumed to be norm-bounded and the time-varying delays include both discrete delay and distributed delay. By introducing a new input-output model, the time-delay system is embedded in a family of systems with a forward system without time delay and a dynamical feedback uncertainty. A sufficient and necessary condition, which guarantees the system regular, impulse-free and stable for all admissible uncertainties, is obtained. Based on the strict linear matrix inequality, the desired robust state feedback controller is also obtained. Finally, a numerical example is provided to demonstrate the application of the proposed method. 相似文献
12.
Observation and feedback plays an important part in guiding normal teaching and especially contributes to achieving educational purposes in an organization.In this article,the role of observation and various kinds of observation will be clarified;the effectiveness of observation will be illustrated and the strengths and shortcomings of the existing system will be pointed out objectively. 相似文献
13.
Observation and feedback plays an important part in guiding normal teaching and especially contributes to achieving educational purposes in an organization.In this article,the role of observation and various kinds of observation will be clarified;the effectiveness of observation will be illustrated and the strengths and shortcomings of the existing system will be pointed out objectively. 相似文献
14.
In this paper,the control of complex delayed networks with different nodes is proposed.Firstly,the stabilization of coupled networks with time delay is investigated.By constructing a Lyapunov function,a linear feedback controller design procedure for the networks is converted to the problem of solving a set of linear matrix inequalities.Then the results are extended to networks with both delayed dynamical nodes and delayed couplings.It is shown that the stabilization of complex networks is determined by the dynamics of each uncoupled node,coupling matrix and feedback gain matrix of networks.Two examples are simulated.In the first example,a network with 10 nodes consisting of Lorenz systems and systems proposed by Zhang in 2009 is given.It is found that the network states are divergent without control,and convergent under designed linear feedback controllers.In the second example,a larger network with 100 nodes consisting of delayed Chen systems and delayed Lorenz systems is given.The proposed method is also effective for large scale networks. 相似文献
15.
We have investigated the feedback control of the cooperative dynamics of two coupled electrochemical oscillators that is induced merely by external noise. The interacting electrochemical cells are modeled with parameter values at which no autonomous oscillations occur, and each unit is forced by its own source of random fluctuations. Application of delayed feedback to only one of two subsystems is shown to be able to change the coherence and time scales of noise-induced oscillations either in the given subsystem or globally. It can also induce or suppress stochastic resonance under the certain conditions. 相似文献
16.
Corrective feedback plays an important role in shaping children's behavior and their learning process;teacher also plays a central role in promoting students'motivation. Therefore, teacher's beliefs and how to implicate CF in the second language acquisition is a question worthwhile thinking. 相似文献
17.
It is difficult for teachers to track student learning on a daily basis. However, the Intemet and new technologies that students use every day can make this much easier and more accessible. This article intends to make evident that using student response systems, such as Socrative and a smartphone, teachers can get more control of their students＇ pace of learning and their progress. Socrative is a very useful tool that helps teachers track student learning in real time. Socrative software can be downloaded on students＇ smartphones, tablets, or laptops and can facilitate online testing with immediate feedback and access to test results. Students receive immediate feedback as soon as they finish answering test questions. It can also promote cooperative learning when students work in groups discussing coursework. Use of the software can increase motivation, self-esteem, and understanding of concepts discussed in class. 相似文献
18.
悬臂板的主动控制及稳定性分析 总被引：3，自引：0，他引：3
研究悬臂板的主动控制及稳定性,以闭环控制系统方程的特征值分析为基础,分析研究了其稳定性.研究表明主动控制在增加系统阻尼性能的同时,亦可能导致系统出现不稳定现象.文中指出当仅有对点之间的负反馈时,系统是渐近稳定的;当负反馈增益矩阵呈非对称或对称但非正定时,系统可能会出现非稳定.,Active vibration control and stability analysis of cantilever plate are discussed. Based on the analysis of characteristic equation of the closed-loop control system, it is shown that such an active control may increase damping properties of the system, meanwhile it may result in instability of the system. It is stable when the feedback only occurs between the collocated sensors and actuators, but it may be unstable when there exists the feedback between sensors and actuators, which mainly depends on the property of the gain matrix of feedback. If the gain matrix is symmetric and definitely positive, the system is stable. 相似文献
19.
Parental influences on the development of child language have been debated in linguistic field.So parental responses,including both positive feedback and negative evidence,have been discussed in the paper. 相似文献
20.
7 studies on the effectiveness of peer and teacher feedback have been critically reviewed in this paper,some problems being perceived either in the research design or their research findings.Based on the detected problems,I put forward some suggestions for the future study and then draw some pedagogical implications. 相似文献