查询词典 symbolic

In our thesis, contents are organized as following In Chapter 1 we present our topic's internal and overseas research situations, theoretical and practical significance, and introduce the research object and contents, and the main contributions of this dissertation. Chapter 2 reviews the development of the stability results for nonlinear systems and some relevant recent results, which include Lyapunov and LaSalle-Yoshizawa theorems for nonlinear systems, and stochastic edition for stochastic nonlinear systems. Sontag's formula for systems affine in control is presented in the frame of CLF. The concepts of disturbance attenuation and the inverse optimality are also explained in this Chapter. In chapter 3 we present the solvable theorem of inverse optimal gain assignment problem, design the inverse optimal controller and the inverse optimal tracking controller for strict-feedback nonlinear continuous systems with unknown time-varing bounded disturbances and constant unknown parameters using an adaptive backstepping algorithm, which are nonlinear, continuous and are easier to realize. These designs are fully systematic and the algorithm can be directly coded in symbolic software. The results of simulation show the effectiveness of the control algorithms.

论文的结构如下：在第1章中，给出了本文研究课题的研究现状、理论意义和实际应用，并介绍了本文的研究对象、研究内容以及主要贡献；在第2章中，针对确定性非线性系统和随机非线性系统，分别介绍了Lyapunov定理、LaSalle-Yoshizawa定理及其随机版本；对仿射系统，在控制Lyapunov函数框架下，给出了Sontag公式；同时给出了非线性系统扰动抑制和逆最优控制问题的基本概念；在第3章中，针对具有未知时变有界扰动和未知定常参数的一类不确定非线性系统，给出并证明了逆最优增益配置可解定理，使用自适应Backstepping算法和均值定理，系统地设计了自适应逆最优控制器和逆最优跟踪器，这种设计方法可同时获得逆最优控制策略和自适应律，简单明了，仿真结果表明该控制算法的有效性，并给出了性能估计。

First, let's consider the number seven: In mathematical terms, it is an irrational number, i.e., a number that cannot be represented as a simple fraction, a number that is "uncountable." To the mind of the symbolic thinker, the number is associated with all that is strange and unusual.

首先，让我们认识一下数字7；在数学上，它是一个无理数，也即除以它的结果不能得到一个单一的数字，除以这一数字将得到一个无穷数列，对一个符号象征思想家的内心来说，这个数字会让人联想到所有古怪的，不寻常的事物。

This former Soviet forces attacking Isreal remain symbolic as Soviet Union is no longer in existence but had spilt into several nations.

这个前苏联部队攻击以色列仍然是象征性的苏联已不复存在，但已波及到一些国家。

Sigmund Freud and Jacque Lacan might have felt that this divine music was a yet unspoken linguistics symbol and form of meaning, and its phallus-transcending characteristics belonged to the feminine jouissance of the body. It was an unsaid state that had not yet entered a symbolic system,and was composed or led by the intersection of all kinds of impulses and desires.

对佛洛依德和拉冈来说，这曲宫籁也许是尚未被说出的语言符号及意义型态，其超越阳物的特质，乃属肉体的女性神漾，是在进入象徵系统之前的一种无语的状态，由各种欲望冲动交错横越或牵引。

The Jain gods are symbolic of common human ideas.

耆那教徒的神是人们理想的标志。

In the classical Jungian framework, the tail-biting Uroborus is the symbolic depiction of the self.

在经典的荣格主义框架中，食尾的Uroborus是对自我的一种象征性的描绘。

The three words are inscribed next to another symbolic piece Beckham apparently wanted to reflect who he feels he has been for the past ten years - a Knight Templar, symbolised by a cross.

这三个字紧*着另一个图案：带十字图案的骑士，那是展示小贝十年前的感受。

It is evident that decorative knotwork is ripe with symbolic meaning.

它是显然的，装饰 knotwork 是成熟的以象徵性意思。

"I think 'Mad World' is kind of symbolic," Lambert told reporters after the show.

"我认为"疯狂世界"是象征性的，"兰伯特在秀后告示笔者。

Langer holds the idea that art is a symbolic form which is created by artists to express human emotions.

苏珊。朗格认为艺术是由艺术家创造出来的表现人类情感的符号形式。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。