检索结果-南通市图书馆

Improved Pruning Algorithm Using Quadratic Renyi Entropy for LS-SVM Modeling

在线全文

cnki会议

学校读者我要写书评

暂无评论

Improved Pruning Algorithm Using Quadratic Renyi Entropy for...

第24届中国控制与决策会议

作者： WANG Peng, YAN Ai-Jun College of electronic Information & control engineering, Beijing University of Technology, Beijing 100124, China

For the loss of sparseness in least squares support vector machine （LS-SVM） model, a new pruning algorithm using Renyi entropy for LS-SVM modeling is presented. The kernel principal component is adopted for data pre-processing, then the training subsets are divided randomly. To solve the problem that the conventional pruning algorithm cannot take full account the location of the Lagrange multiplier, the concept of quadratic Renyi entropy is introduced as the basis of training and pruning in LS-SVM modeling. The results of simulation verify the validity of the algorithms, thus the sparseness and generalization ability of the model can be improved. The presented algorithm can be applied to multiple-output modeling.

关键词： LS-SVM Sparseness Pruning Quadratic Renyi Entropy

On the Distribution of Prime-Triplets

在线全文

cnki会议

学校读者我要写书评

暂无评论

工程科学（英文版） 2007年第2期5卷 139-147页

作者： Tu Xiangchu~1, Tu Chengyuan~2, Tu Chengyu~1(1.College of electronic & control engineering, Beijing University of Technology, Beijing, 100022, China 2.College of Mechanical engineering & Applied electronic Technology, Beijing University of Technology, Beijing, 100022, China)

A new approach to the research of the distribution of prime-triplets is developed. It differs from the usual methods (involving the sieve method) for this kind of research, and basing on Chebyshev inequality and on the computation of average concentration of all the related subset. It leads to the proofs of following Lemma 2 and Theorem 2 (Lemma 1 and Theorem 1 in Reference 1 had been proved by means of this new method): Lemma 2 Among all the prime-triplet-subsets there exists at least one such subset which is an infinite set. Theorem 2 All the prime-triplet-subsets or infinitely many such subsets are infinite *** for estimating the amount of such infinite sets are provided in this paper.

关键词： prime-triplet prime-triplet-subset Chebyshev inequality average concentration

在线全文

学校读者我要写书评

暂无评论

细胞自动机及其在菌体生长建模仿真中的应用

系统仿真学报 2004年第12期16卷 2651-2654页

作者：于乃功阮晓钢北京工业大学电子信息与控制工程学院北京100022

在介绍细胞自动机基本概念、基本特征和仿真模型建立步骤的基础上,较详细地讨论细胞自动机在青霉素发酵过程菌体生长建模及仿真中的应用。在建立青霉素分批发酵过程菌体生长细胞自动机模型的前提下,以Matlab为开发工具实现了模型的可视... 详细信息

在介绍细胞自动机基本概念、基本特征和仿真模型建立步骤的基础上,较详细地讨论细胞自动机在青霉素发酵过程菌体生长建模及仿真中的应用。在建立青霉素分批发酵过程菌体生长细胞自动机模型的前提下,以Matlab为开发工具实现了模型的可视化编程,并进行了仿真实验。实验结果表明,利用细胞自动机建立的青霉素分批发酵过程菌体生长仿真模型能较好地描述青霉素菌体生长的演化行为。由此可以看出,细胞自动机具有很强的模拟复杂物理现象或过程的能力,其为青霉素发酵过程的建模、仿真提供了一种理想的生命计算模型。

关键词：细胞自动机青霉素发酵过程菌体生长建模仿真

在线全文

学校读者我要写书评

暂无评论

基于平面连杆机构的主动平衡器

上海交通大学学报 2010年第12期44卷 1727-1734页

作者：张英姚燕安查建中北京交通大学机械与电子控制工程学院北京100044

提出一种结构独立的主动平衡器的设计构想,旨在不改变待平衡机构原有结构和运动规律的情况下,通过引入控制系统来实现机构的柔性平衡.该平衡器由两自由度机构和控制电机组成,两自由度机构的一个输入轴兼做输出轴,与待平衡机构的输入轴... 详细信息

提出一种结构独立的主动平衡器的设计构想,旨在不改变待平衡机构原有结构和运动规律的情况下,通过引入控制系统来实现机构的柔性平衡.该平衡器由两自由度机构和控制电机组成,两自由度机构的一个输入轴兼做输出轴,与待平衡机构的输入轴或输出轴相联并与其以相同的速度转动,另一个输入轴由控制电机驱动.这种特殊的结构使主动平衡器成为具有一个外伸轴的智能平衡箱,既可以方便地安装在待平衡机构上,又可以通过结构参数和控制参数的调整来满足其不同的平衡要求.对主动平衡器进行概念设计,确定了基于平面连杆机构的4种可行研究方案,并以其中的1种为例,介绍了主动平衡器的设计方法.最后,以曲柄摇杆机构为待平衡机构给出了算例,对不同平衡目标下主动平衡器各种研究方案和附加杆组法的平衡效果进行了比较.结果表明:由于控制系统的引入使主动平衡器具有更大的柔性,故对不同平衡目标,均可通过其执行机构结构参数和控制输入运动规律的优化设计获得较好的平衡效果,并可通过控制输入的再设计有效地补偿因工况改变而造成的机构动力性能的变化.

关键词：主动平衡震动力矩输入扭矩震动力连杆机构

Research on Indoor Location Technology based on Back Propagation Neural Network and Taylor Series

在线全文

学校读者我要写书评

暂无评论

Research on Indoor Location Technology based on Back Propaga...

第24届中国控制与决策会议

作者： SHI Xiao-Wei, ZHANG Hui-Qing College of electronic Information and control engineering, Beijing University of Technology, Beijing 100124, China

The traditional indoor location algorithm based on distance-loss model mostly turn received signal strength indicator RSSI into distance, and then through the location-distance algorithm to achieve positioning. These algorithms need fit the wireless signal propagation model parameters A and N through experience or large amounts of data, so they are dependent on experience and are not strong universal algorithms for location of the different environment, also low accuracy. After lots of research and analysis of radio signal propagation model and the traditional indoor location algorithm, a new indoor location algorithm uses BP neural network to fit the distance-loss model is proposed. From a number of distances between reference nodes and blind node, Taylor series expansion algorithm is used to determine the coordinates of the blind node. Finally, the experiment result shows that the new algorithm improves the positioning accuracy and universality, compared with the traditional positioning algorithms.

关键词： Indoor location Back propagation neural network (BPNN) Received signal strength indicator (RSSI) Zigbee Taylor Series.

On the Distribution of Prime Pairs

在线全文

cnki会议

学校读者我要写书评

暂无评论

engineering Sciences 2005年第3期 22-30页

作者： Tu Xiangchu1, Tu Chengyu1 , Tu Chengyuan2 (1. College of electronic Information & control engineering, Beijing University of Technology, Beijing 100022 2. College of Mechanical engineering & Applied electronic Technology, Beijing University of Technology, Beijing 100022)

A new approach to the research into the distribution of prime pairs is developed, attached with corollaries about the distribution of prime triplets and generally about that of prime h-tuplets. It differs from the usual methods(involving the sieve method) for this kind of research, and bases on Chebyshev inequality and on the computation of average concentration of all the related subsets, and leads to the proofs of following lemma and theorem, attached with four corollaries:[Lemma 1] Among all the prime-pair-subsets there exists at least one such subset (namely one of the sets of generalized prime twins) which is an infinite set.[Theorem 1] All the prime-pair-subsets (namely all sets of generalized prime twins) or infinitely many prime-pair-subsets are infinite sets.[Corollary 1] Among all the prime-triplet-subsets there exists at least one such subset which is an infinite set.[Corollary 2] All the prime-triplet-subsets or infinitely many prime-triplet-subsets are infinite sets.[Corollary 3] Among all the prime-h-tuplet-subsets there exists at least one such subset which is an infinite set, where h is an arbitrary finite integer ≥2.[Corollary 4] All the prime-h-tuplet-subsets or infinitely many prime-h-tuplet-subsets are infinite sets, where h is an arbitrary finite integer ≥2.

关键词： prime-pair-subset (set of the generalized prime twins) prime-triplet-subset prime-h-tuplet-subset Chebyshev inequality average concentration

Balance control of the Two-Wheeled Robot by Adams and MATLAB

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Balance Control of the Two-Wheeled Robot by Adams and MATLAB

第三届国际自动化测试与仪器仪表学术会议

作者： Ruan Xiaogang Wu Weixia Liu Hang College of electronic Information and control engineering Beijing University of Technology Beijing 100124 China)

＜正＞This paper discusses the two-wheeled self-balanced robot’s balance *** the dynamic analysis of the robot,we determine the robot’s motion *** construct the mechanical system model in the ADAMS and the control system model in the MATLAB *** control method is used in order to make the system be more *** ADAMS / control Interface Module will allow the two connected to achieve the interactive simulation *** results demonstrate the effectiveness of fuzzy control method..

关键词： Two-Wheeled robot Adams Fuzzy control

在线全文

cnki会议

学校读者我要写书评

暂无评论

小波变换在机车振动信号分析中的应用研究

铁道学报 2003年第4期25卷 115-118页

作者：廖凯张家栋霍凯北方交通大学机械与电子控制学院北京100044

介绍了小波变换的理论背景和在振动信号处理方面的两种应用。文中对机车转向架振动信号用db4小波进行了分解,并运用本文所介绍的算法进行了降噪处理,取得了明显的效果;运用小波包技术建立了机车转向架的振动状态特征向量,较好地表征了... 详细信息

介绍了小波变换的理论背景和在振动信号处理方面的两种应用。文中对机车转向架振动信号用db4小波进行了分解,并运用本文所介绍的算法进行了降噪处理,取得了明显的效果;运用小波包技术建立了机车转向架的振动状态特征向量,较好地表征了机车振动的故障状态。

关键词：铁道机车振动监测小波分析

Intelligent Optimizing Setting control Method for Shaft Furnace Roasting Process

在线全文

学校读者我要写书评

暂无评论

Intelligent Optimizing Setting Control Method for Shaft Furn...

2010 Chinese control and Decision Conference

作者： Ai-jun Yan,Zhe Xu,Pu Wang College of electronic Information & control engineering,Beijing University of Technology,Beijing,100124,China

＜正＞Due to its synthetic and complex characters,such as multivariable,strong coupling,nonlinearity,the shaft furnace roasting process is very difficult to control in optimizing *** deal with this problem,a hybrid intelligent optimizing setting control approach is *** set points in control loops are produced by the methodology of case-based reasoning（CBR）,followed by real-time appraisal and correction for the purpose of the optimizing on integrated production *** proposed method realized the optimizing control for integrated production indices. The successful application on shaft furnaces from a mineral processing plant in China indicates effectiveness of the proposed method.

关键词： Optimizing Setting Shaft Furnace Intelligent control