This essay mainly focuses on the feedback move in IRF(initiate- response- feedback) to investigate the characters and functions of teacher feedback in different class types through classroom observation. The research ...This essay mainly focuses on the feedback move in IRF(initiate- response- feedback) to investigate the characters and functions of teacher feedback in different class types through classroom observation. The research finds that(1) teachers in different class types prefer to adopt evaluative feedback and use more positive feedback.(2) the proportion of each feedback is different in listening and speaking, reading and writing class. The implications are that English teachers in senior high school should adopt different feedback flexibly and consider what kind of feedback is more likely elicit the students' output in different class types.展开更多
Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study...Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study aims to investigate corrective feedback and draw enlightening conclusions:1) Different corrective feedback types have different effects on second language acquisition; 2)The effect of corrective feedback is also influenced by the feedback timing, explicitness of the feedback and learners' individual differences; 3) Teachers should consider feedback types, feedback timing, and individual differences of students based on teaching contents when providing corrective feedback in foreign language teaching.展开更多
针对含不确定因素的多输入多输出非线性微分代数系统,提出一种目标全息反馈鲁棒自适应控制方法(robust adaptive control with objective holographic feedbacks,RACOHF).该方法考虑到了系统模型参数的不确定性和外部扰动,同时将外部输...针对含不确定因素的多输入多输出非线性微分代数系统,提出一种目标全息反馈鲁棒自适应控制方法(robust adaptive control with objective holographic feedbacks,RACOHF).该方法考虑到了系统模型参数的不确定性和外部扰动,同时将外部输入扰动视为模型不确定性参数的变化,在目标全息反馈控制方法的基础上,通过设计模型不确定性部分的自适应调节律,实现多目标的自适应跟踪控制.将该方法应用于中间再热式汽轮发电机组蒸汽调节阀和励磁的协调控制,结果表明,在系统部分参数不确定和存在外部扰动的情况下,所提出方法能确保发电机机端电压和有功功率等目标量在期望的工作点上运行而不发生静态偏移.与目标全息反馈非线性控制(nonlinear control with objective holographic feedbacks,NCOHF)相比,所提出的方法(RACOHF)能更好地协调系统的动、静态性能.展开更多
本文根据数据恢复时,本地时钟与输入数据之间的相位关系及其实现方式的不同,将高速时钟与数据恢复(CDR,Clock and Data Recovery)电路技术分为三类,也即前馈相位跟踪型,反馈相位跟踪型,以及盲过采样型。进而又分别对每一类型进行了细分...本文根据数据恢复时,本地时钟与输入数据之间的相位关系及其实现方式的不同,将高速时钟与数据恢复(CDR,Clock and Data Recovery)电路技术分为三类,也即前馈相位跟踪型,反馈相位跟踪型,以及盲过采样型。进而又分别对每一类型进行了细分并分别进行了深入的剖析和比较。最后又给出了不同应用环境下,CDR技术的选择策略,并指出了CDR技术的发展趋势。本文通过对高速CDR技术详尽而又深刻的分析比较,勾勒出了一个高速CDR技术的关系及发展演化图,使读者能够对现存的高速CDR技术及其发展趋势有一个前面而又清晰的认识。展开更多
文摘This essay mainly focuses on the feedback move in IRF(initiate- response- feedback) to investigate the characters and functions of teacher feedback in different class types through classroom observation. The research finds that(1) teachers in different class types prefer to adopt evaluative feedback and use more positive feedback.(2) the proportion of each feedback is different in listening and speaking, reading and writing class. The implications are that English teachers in senior high school should adopt different feedback flexibly and consider what kind of feedback is more likely elicit the students' output in different class types.
文摘Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study aims to investigate corrective feedback and draw enlightening conclusions:1) Different corrective feedback types have different effects on second language acquisition; 2)The effect of corrective feedback is also influenced by the feedback timing, explicitness of the feedback and learners' individual differences; 3) Teachers should consider feedback types, feedback timing, and individual differences of students based on teaching contents when providing corrective feedback in foreign language teaching.
文摘针对含不确定因素的多输入多输出非线性微分代数系统,提出一种目标全息反馈鲁棒自适应控制方法(robust adaptive control with objective holographic feedbacks,RACOHF).该方法考虑到了系统模型参数的不确定性和外部扰动,同时将外部输入扰动视为模型不确定性参数的变化,在目标全息反馈控制方法的基础上,通过设计模型不确定性部分的自适应调节律,实现多目标的自适应跟踪控制.将该方法应用于中间再热式汽轮发电机组蒸汽调节阀和励磁的协调控制,结果表明,在系统部分参数不确定和存在外部扰动的情况下,所提出方法能确保发电机机端电压和有功功率等目标量在期望的工作点上运行而不发生静态偏移.与目标全息反馈非线性控制(nonlinear control with objective holographic feedbacks,NCOHF)相比,所提出的方法(RACOHF)能更好地协调系统的动、静态性能.
文摘本文根据数据恢复时,本地时钟与输入数据之间的相位关系及其实现方式的不同,将高速时钟与数据恢复(CDR,Clock and Data Recovery)电路技术分为三类,也即前馈相位跟踪型,反馈相位跟踪型,以及盲过采样型。进而又分别对每一类型进行了细分并分别进行了深入的剖析和比较。最后又给出了不同应用环境下,CDR技术的选择策略,并指出了CDR技术的发展趋势。本文通过对高速CDR技术详尽而又深刻的分析比较,勾勒出了一个高速CDR技术的关系及发展演化图,使读者能够对现存的高速CDR技术及其发展趋势有一个前面而又清晰的认识。
