查询词典 feedback

In the thesis , firstly the problem of static output feedback H∞control was explored for discrete time singular systems. Based on the generalized Riccati inequality and linear matrix inequality, necessary and sufficient conditions were obtained for the existence of static output feedback H∞controllers, which guarantees that the resulting closed-loop system is admissible with its transfer function matrix satisfying H∞norm constraint.

本文首先利用线性矩阵不等式和广义Riccati不等式，给出离散广义系统中存在静态输出反馈H∞控制器，使得闭环系统是容许的且其传递函数矩阵满足H∞范数约束的充要条件。

There are two possible feedback ways:(1) acting as a feedback factor, OR binds toother transcriptional factor (2) acting as a feedback factor, OR binds to regulationregion of other OR genes.

但在此过程中，OR具体是如何反馈抑制其他OR的表达，现在仍不清楚。

A new scheme based on dq transformation and positive feedback is provided to detect islanding. Based on the new scheme, methods of voltage positive feedback and frequency positive feedback by dq transformation are proposed in this paper.

为了检测孤岛效应，本文提出了基于dq变换和正反馈的新检测策略，基于这个策略，提出了基于dq变换的电压正反馈和频率正反馈两种检测方法。

as an important aspect in researching the classroom process, feedback from teachers could offer the ideal perspective for the study of second language classroom instruction.the study on the effects of feedback from classroom teachers of second languages, and especially of recasts, is of much importance, not only theoretically but also empirically, when conducting a comprehensive research on the quantity and quality of such feedback.

作为二语课堂过程研究的一个重要方面，教师反馈研究能为我们了解和研究二语课堂教学的真实情况提供一个理想的视角。

First, we consider nonholonomic chained systems with modeling error, in this section,based on back-stepping , using the so-called adding a integrator , state-scaling technique , we design discontinuous feedback law,such that the trival solution of the closed-loop systems global strong stable; Second,we consider high-order nonholonomic chained systems with modeling errors and external disturbances, in this section,using input/state-scaling and integrator backstepping methods , we design discontinuous feedback law and give out the switching strategy, such that the closed-loop systems global /C-exponential stable; Finally, we consider a class of more general power chained form systems with particular drift-terms, in this section , using Lyapunov method, we design time-varying feedback law , such that the closed -loop systems p—exponential stable.

第一部分考虑的模型为带有模型误差的高阶非完整链系统，我们运用加幂积分器、State-scaling技巧以及基于Back-stepping方法构造出不连续反馈律，从而使得所讨论系统的闭环系统的平凡解全局强稳定；第二部分考虑的模型为带有模型误差的不确定高阶非完整链系统，这一部分我们运用input／state scaling和integrator backstepping方法构造出不连续反馈律，并给出切换策略，使得所对应的闭环系统全局κ-指数稳定；第三部分考虑的系统是形式更为一般的且带有特殊形式漂移项的幂链系统，利用Lyapunov函数方法，设计出时变反馈律，从而使得相应的闭环系统ρ-指数稳定。

In the third chapter, using the methods of nonlinear feedback functions and Lyapunov functions and combining analytical with numerical methods, the nonlinear feedback methods are introduced and the synchronizations of chaos in Hadley system of aerographs and LFRBM system of physics are realized. Some of nonlinear feedback functions are constructed.

第三章在介绍非线性反馈方法原理的基础上，应用非线性控制的基本思想及Lyapunov函数方法，将解析法与数值法相结合，分别对气象学中著名的Hadley环流和物理学中的LFRBM系统进行研究，找到了一类非线性反馈函数，实现了混沌自同步，并利用Mathematica软件进行仿真实验，数值结果说明了该方法的有效性。

A retrieval method based on multiple sub-clustering centroids with relevance feedback The performance of relevance feedback technique in image retrieval is not stable in many settings, and more feedback information does not ensure more improving in effectiveness.

由于图像内在的复杂性，唯一的全局检索点通常难以准确覆盖用户的检索目标，使得反馈对检索效果的改进表现出不稳定性。

A codebook is used for feedbacking power distribution vector, which can effectively reduce the feedback amount of information; the use of two codebooks are used at the same time, which can respectively feedback the power distribution vector and pre-code matrix and can improve the transmission performance of the system under the condition of limited feedback.

使用码本反馈功率分配矢量，可以有效地减少信息的反馈量。同时使用两个码本，分别反馈功率分配矢量和预编码矩阵，可以在有限反馈的条件下提高系统的传输性能。

To overcome the existing deficiency in force feedback dataglove, such as poor security, insufficiency of force for feedback, and so on, a passive force actuator based on magnetorheological fluid for force feedback dataglove is presented.

为了克服目前力反馈数据手套存在的安全性差、力再现范围小等不足，提出了一种磁流变液被动力觉驱动器实现方法。

Compared the voltage negative feedback wire-feeding speed regulation system supported by current positive feedback with the rotational speed negative feedback regulation system, the equivalent condition of the two systems is obtained. Then, a wire-feeding speed regulation circuit for the CO_2 welding machine is designed based on TL494 chip, which has the self-protective function under the condition of current overloading.

通过对电压负反馈配合电流正反馈的送丝调速系统与转速负反馈调速系统的比较，得出了这两种调速系统的等效条件，并采用电压负反馈配合电流正反馈技术，设计了一种以TL494为核心的具有过电流截止保护功能的CO_2焊机送丝调速电路。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐