基于神经网络的逆控制法在热工过程中的应用仿真

逆控制法通过逆建模使串联控制器拥有与被控对象互为倒数的传递函数。将逆控制和神经网络相结合可以使逆控制法的控制效果都得到改进。以经典热工过程为控制对象,通过逆控制器与常规 PID 控制器的控制效果仿真比较,表明这种方法具有很好的快速反应性、精确的控制效果以及很强的自适应能力。     

基于RLS算法的小型无人直升机悬停自适应逆控制

为了抑制小型无人直升机在悬停控制中遇到的侧风等干扰,将自适应逆控制(AIC)理论引入其中,并针对小型无人直升机在悬停状态下的模型特性及控制器的鲁棒性设计问题,改进了自适应逆控制框图。同时,根据小型无人直升机悬停基本原理,搭建了悬停试飞平台,并利用Kane方法对小型无人直升机进行了动力学建模。在算法上采用递推最小二乘算法(RLS)对小型无人直升机进行参数辨识和控制器的设计。实验结果表明,AIC-RLS方法在消除侧风等干扰性能上优于PID控制器。室外平台悬停控制的实现证明了上述方法的有效性。     

一种改进的图像自适应逆梯度插值算法

为了改善传统线性插值算法产生的图像模糊和边缘锯齿化现象,提出了一种改进的自适应逆梯度插值算法。该算法根据图像局部梯度特征,对已有的基于逆梯度插值算法中的逆梯度权值进行自适应加权,然后与经典的WaDi插值算法融合,得到改进的插值算法。实验结果表明,改进算法插值图像视觉效果和客观评价准则(峰值信噪比上)都有明显提高。     

智慧学习环境中自适应学习系统动力机制研究

智慧学习环境下的教学更加关注学习者的个性化诉求,自适应学习系统能够为实现个性化学习提供技术支持。文章针对传统层状自适应学习系统模型未阐明学习系统内部运行机制的不足,基于自适应逆控制理论研制了一种自适应学习系统动力模型。学习者的学习目标选择促使学习系统开始运行,学习者的初始学习目标与其后的学习成效之间的差值是维系学习系统继续运行的内在动力。学习系统在领域模型、学习者模型、认知诊断和自适应模型四者的协同作用下向学习者不断推送适切的学习资源,旨在消除学习目标与当前学习成效之间的差值,从而使系统重新归于稳定。文章从系统动力机制视角,设计了自适应学习系统包含的领域模型、学习者模型、自适应模型和认知诊断模型。研究将为自适应学习系统的设计与实现提供理论借鉴。     

带有未知死区非线性系统的自适应控制方案

针对一类带有未知死区的随机严格反馈非线性系统,提出了一种自适应模糊控制方案：利用命令滤波来处理退步方法的复杂性问题,并引入误差补偿机制克服动力学表面方法的缺点;此外,通过利用死区斜坡的边界信息,对未知的非线性系统不需要建立逆死区。与已有的结果相比,该方案的优点是：通过建立补偿信号消除滤波误差,且只有一个必需的自适应参数,这使该控制方案在实际应用中更有效;该控制方案,保证了闭路系统的所有控制信号最终一致概率有界,跟踪误差收敛到相应的紧集。     

基于加权低分辨率图像的自适应正则化图像重建

图像重建是一个病态问题,需要应用逆过程获得原始图像的近似估计。亚像素配准虽在图像重建过程中发挥了重要作用,但难以获得准确值。提出一种自适应图像重建迭代算法和基于加权低分辨率图像的Tikhonov正则化参数的自适应估计方法。权重系数保持了每个低分辨率图像的逼真度,而正则化系数则控制了图像平滑度。实验结果表明,此算法无论在客观测量还是在视觉评价上,都优于传统的Tikhonov正则化方法。     

关于图的逆符号全控制数的上界

图的符号全控制引申为图的逆符号全控制,并在此基础上研究图的逆符号全控制数的一些性质,给出了图的逆符号全控制数的上界.     

关于图的逆符号全控制数的上界

图的符号全控制引申为图的逆符号全控制,并在此基础上研究图的逆符号全控制数的一些性质,给出了图的逆符号全控制数的上界。     

自适应控制方法研究与发展

本文详细概括与分析了自适应控制理论的研究与进展,对模糊自适应控制和神经网络自适应控制领域内存在的主要问题进行了分析,并对可能的研究方向进行了展望.     

基于神经网络的非线性系统自适应控制综述

从控制结构的角度总结神经网络自适应在非线性系统中的应用,对神经网络自校正、模型参考自适应控制和内模控制,并对其构成与特点进行了分析.指出了神经网络自适应控制研究中存在的一些问题.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.