查询词典 stability criterion

Based on the theory and experiments, the paper builds up the simplified mathematical model of the servo control system, deduces the system control rigidity expression, and points out the method to improve control rigidity. According to Routh stability criterion, the analytic stability condition is solved, which shows the conflict between the stability and control rigidity and that gyroscope is the key factor of the conflict.

论文结合理论和试验建立了光电稳定伺服控制系统的简化数学模型，推导出系统控制刚度表达式，指出提高控制刚度的方法；利用劳斯判据求解出系统稳定的解析条件式，描述了稳定性与控制刚度之间的矛盾，并指出陀螺是矛盾关键。

First, the Lyapunov functional and variation of constants method are adopted to study the effect that Sigmoid function and the relation of resistance, capacitance and current in Hopfield neural networks have on the stability of networks. The stability criterion constructed by physics parameters is obtained. Thus how the constrained relation of physics parameters affects the stability of Hopfielf neural networks is clear. Based on the study above, the perturbation model of recurrent neural networks is constructed. And the theorems of the existence of solution of perturbation model are presented.

首先，采用Lyapunov泛函法和常数变易法研究Hopfield神经网络中给出的电阻、电容、电流之间的关系以及Sigmoid函数对网络稳定性的影响规律，得出仅由物理模型参数构成的稳定性判据，从而弄清物理模型参数约束关系对Hopfield神经网络稳定性所起的作用，在此基础上，构建了递归神经网络的扰动模型，并通过讨论扰动模型解的存在性问题，给出递归神经网络扰动模型解的存在性定理。

On the basis of the past research, the aims of this study include:(1) To establish the module of emotion induced by cognitive task;(2) To set up the assessment system of criterion of emotional stability;(3) To study on the effect of emotional stability to cognitive task performance;(4) To investigate the influence of situational variable on psychophysiological research of emotion;(5) To discuss the physiological differences between different emotional stability individuals under different situations.

在以往研究的基础上，本工作的主要目的如下：（1）建立情绪诱导认知作业模式；（2）建立情绪稳定性效标评价体系；（3）探讨情绪稳定性对认知作业绩效的影响；（4）研究情境变量对情绪生理心理学研究的影响；（5）探讨不同情绪稳定性个体在不同情境下的生理反应差异。

The practically oriented treatment of dynamic structural buckling is undoubtely be hampered by two problems, how to adopte a existed criterion or advance a new criterion of dynamic stability in general sense, and how to develope a simple and appealing algebraic representation in terms of singularity of the tangental stiffness matrix .

实际解决动力稳定问题的进程无疑受碍于怎样选用已有的或发展新的一般意义上的动力稳定性判定准则，以及怎样发展简洁的富有吸引力的切线刚度矩阵奇异性的代数描述方法。

The reconstruction problem is ill-posed, so two optimal criterions, the least module and the smoothness criterion base on Tikhonov regularization technique, are introduced into reconstruction algorithm. Many regularization parameters choice strategies are investigated, and the TPA(Two—Parameter Algorithm) strategy which is based on the Morozov discrepancy principles, is implemented in two regularization reconstruction algorithms.Numerical experiment results show that the nonnegative and smoothness constraint condition can overcome the difficulty of iteration semiconvergent, preconditioned technique can improve convergence rate and reconstruction accuracy, smoothness regularization criterion can meliorate ill-posed problem of reconstruction and enhance iteration stability, and the TPA is an effective strategy of regularization parameters choice.

数值试验表明：在共轭梯度法中引入非负约束和光滑约束改善了迭代的"半收敛"性，非负约束保证了解的非负性，光滑约束抑制了重建解的振荡现象，约束算法的重建精度与无约束算法相比大幅度提高；在约束共轭梯度重建算法中引入预优技术，可以加快算法的收敛速度，提高迭代的稳定性和重建精度；引入光滑准则的正则化技术可以有效改善图像重建问题的不适定性，加快迭代的收敛速度，提高迭代的稳定性和图像重建质量，计算正则参数的TPA算法在闪光照相图像重建中是有效的。

This paper presents a stability criterion for design iterative learning controller. From the criterion,one can change the design problem into finding a positive definite discrete matrix kernel. It has been shown that what kind of variable can be controlled by the iterative learning,(2) and what kind of filter can be included into the controller.

摘要提出了一种针对自学习控制的稳定性判据，应用这一稳定性判据将自学习控制器的设计转化为寻找正定离散矩阵核，从而回答了两个问题，其一什么样的量可以通过自学习叠代加以控制，其二学习叠代中什么样的滤波环节的引入不会影响学习收敛性。

The Routh criterion of control system theory is applied to obtain the stability criterion.

通过对整流桥换相过程的分析，建立了系统在稳态运行点的微变稳定模型。

Finally, the problem of the stress release of the expansive soil roadbed slope in the excavation process and the failure criterion in the sliding simulation are discussed. The synthetic criterion for the unstable slope is proposed. The dynamic simulated analyses on the stability of the expansive soil roadbed slope in the process of digging, fore-and-after of soaking and different soaking depth have been carried out.

最后，讨论了膨胀土路堑边坡开挖过程中的应力释放问题和边坡模拟过程中的失稳判据问题，提出了边坡失稳的综合判别依据；对膨胀土路堑边坡进行了开挖过程中和浸水前后以及不同浸水深度时的稳定性的动态模拟分析。

It is shown that under rotation symmetry the stability criterion of systems can be simplified to a criterion of a subsystem.

结论是旋转对称下对双线性系统能控性的判别可简化为只对其一个子系统进行判别。

The reconstruction problem is ill-posed, so two optimal criterions, the least module and the smoothness criterion base on Tikhonov regularization technique, are introduced into reconstruction algorithm. Many regularization parameters choice strategies are investigated, and the TPA(Two—Parameter Algorithm) strategy which is based on the Morozov discrepancy principles, is implemented in two regularization reconstruction algorithms.Numerical experiment results show that the nonnegative and smoothness constraint condition can overcome the difficulty of iteration semiconvergent, preconditioned technique can improve convergence rate and reconstruction accuracy, smoothness regularization criterion can meliorate ill-posed problem of reconstruction and enhance iteration stability, and the TPA is an effective strategy of regularization parameters choice.

数值试验表明：在共轭梯度法中引入非负约束和光滑约束改善了迭代的&半收敛&性，非负约束保证了解的非负性，光滑约束抑制了重建解的振荡现象，约束算法的重建精度与无约束算法相比大幅度提高；在约束共轭梯度重建算法中引入预优技术，可以加快算法的收敛速度，提高迭代的稳定性和重建精度；引入光滑准则的正则化技术可以有效改善图像重建问题的不适定性，加快迭代的收敛速度，提高迭代的稳定性和图像重建质量，计算正则参数的TPA算法在闪光照相图像重建中是有效的。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48