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The 26th Chinese Control and Decision Conference (2014 CCDC)最新文献

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H∞ deconvolution filter design for time-delay systems via equivalent transformation 基于等效变换的时滞系统H∞反卷积滤波器设计
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852665
Fuqiang You, Hui Li
This paper proposes an H∞ deconvolution design for linear systems with output state time delay. The basic idea of our study is to eliminate the time delays of system and transform it to a delay-free system by the bicausal change of coordinates approach. Then, we design H∞ deconvolution for the delay-free systems, which is equivalent to the original system with time delays. We analyze the general structure and innovation structure of the H∞ deconvolution filter. Based on the bounded real lemma, a time domain design approach and a sufficient condition for the existence of deconvolution filter are presented. The prarameterization of the deconvolution filter could be completed by solving a Riccati equation. The proposed method is useful for the case that does not require statistical information about disturbances.
提出了一种具有输出状态时滞的线性系统的H∞反褶积设计方法。本研究的基本思想是利用坐标的双因果变换方法消除系统的时滞,将其转化为无时滞系统。然后,我们对无延迟系统进行了H∞反褶积设计,相当于原系统具有时滞。分析了H∞反卷积滤波器的一般结构和创新结构。基于有界实引理,给出了一种时域设计方法和反卷积滤波器存在的充分条件。反卷积滤波器的参数化可以通过求解Riccati方程来完成。该方法适用于不需要扰动统计信息的情况。
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引用次数: 1
An improved MRI denoising algorithm based on wavelet shrinkage 一种改进的基于小波收缩的MRI去噪算法
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852687
Kaikai Song, Q. Ling, Zhaohui Li, Feng Li
Magnetic resonance imaging (MRI) is very important in medical diagnosis. Denoising is a critical step for MRI diagnosis. Wavelet shrinkage is an efficient denoising method. It can be further classified into two types, the threshold method and the proportional-shrink method. However, both methods have their disadvantages. When the threshold method is implemented, the noise cannot be perfectly removed under a hard threshold while the denoised image may have fuzzy edges with a soft threshold. Furthermore, when the noise is too strong, the noise removal may not be enough by the threshold method. The proportional-shrink method requires that the variance field of the wavelet coefficients should change smoothly and the noise should obey a Gaussian distribution. If these assumptions are violated, the estimated ratios would not be precise so that too much texture information may be removed and the image can be distorted. This paper presents an improved method to combine the above two methods. By combining the processed results together, the improved method can achieve a good balance between denoising and retaining the texture information. We verify the efficiency of our method through some simulated data from an open database.
磁共振成像(MRI)在医学诊断中具有重要的应用价值。去噪是MRI诊断的关键步骤。小波收缩是一种有效的去噪方法。它可以进一步分为阈值法和比例收缩法两种类型。然而,这两种方法都有其缺点。采用阈值法时,在硬阈值下不能完全去除噪声,而在软阈值下去噪后的图像可能存在模糊边缘。此外,当噪声太强时,阈值法的去噪效果可能不够。比例收缩法要求小波系数的方差场变化平稳,噪声服从高斯分布。如果违反这些假设,估计的比例将不精确,因此可能会删除过多的纹理信息,并可能导致图像失真。本文提出了一种将上述两种方法结合起来的改进方法。通过将处理后的结果结合在一起,改进的方法在去噪和保留纹理信息之间取得了很好的平衡。通过一个开放数据库的仿真数据验证了该方法的有效性。
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引用次数: 3
A novel approach for image classification 一种新的图像分类方法
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852938
Sonhao Zhu, Jiawei Liu, Ronglin Hu
The overwhelming amounts of digital images on the Web and personal computers have triggered the requirement of an effective tool to classify each image into appropriate semantic category based on the image content has become an increasingly difficult and laborious task. To deal with this issue, we propose a novel multi-view semi-supervised learning framework to improve the prediction performance of image classification by using multiple views of an image. In the training process, labeled images are first adopted to train view-specific classifiers independently using uncorrelated and sufficient views, and each view-specific classifier is then iteratively re-trained using initial labeled samples and additional pseudo-labeled samples based on a measure of confidence. In the classification process, the maximum entropy principle is utilized to assign appropriate category label to each unlabeled image using optimally trained view-specific classifiers. Experimental results on a general-purpose image database demonstrate the effectiveness and efficiency of the proposed multi-view semi-supervised scheme.
网络和个人计算机上海量的数字图像引发了对一种有效的工具的需求,即基于图像内容将每张图像划分为适当的语义类别,这已经成为一项越来越困难和费力的任务。为了解决这个问题,我们提出了一种新的多视图半监督学习框架,通过使用图像的多个视图来提高图像分类的预测性能。在训练过程中,首先使用标记的图像,使用不相关和充足的视图独立训练特定视图分类器,然后使用初始标记样本和基于置信度的额外伪标记样本迭代地重新训练每个特定视图分类器。在分类过程中,利用最大熵原理,使用最优训练的特定于视图的分类器为每个未标记的图像分配适当的类别标签。在一个通用图像数据库上的实验结果证明了该多视图半监督算法的有效性和高效性。
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引用次数: 1
Merging several business process variants 合并多个业务流程变体
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6853112
Huifang Li, Harbi Mohamed El-Amine, H. Mohamed
In the last decade, modern sophisticated process-aware information systems have been taken place to provide a new possibility of process model configurations at build-time and enable process instance changes during runtime. However, this advantage has generated another challenge, which is the high price of configuration and maintenance of the big number of the derived process model variants (process variants for short). This paper proposes an algorithm that accepts as input a collection of process variants and generates a merged model. This algorithm has four main steps: determine the distinct blocks, common blocks, placeholders and finally construct the merged model. The merged model contains two types of blocks, common blocks and placeholders; the first block captures the commonalities of the process variants, and the second one captures the differences between them. In this way, the merged model is kept as small as possible. Furthermore, this merged model can subsumes the behaviors of all input models, ensures the trace back of each element from which input model is originated, and derives any of the input models from the merged model. Existing solutions either fail in respecting these requirements or allow only for merging pairs of process models. However, our algorithm allows for merging a collection of process variants at the same time.
在过去十年中,已经出现了现代复杂的流程感知信息系统,以提供在构建时配置流程模型的新可能性,并支持在运行时更改流程实例。然而,这种优势产生了另一个挑战,即配置和维护大量派生的流程模型变体(简称流程变体)的高昂成本。本文提出了一种算法,该算法接受一组过程变量作为输入,并生成一个合并模型。该算法主要分为四个步骤:确定不同块、公共块、占位符,最后构造合并模型。合并后的模型包含两种类型的块,公共块和占位符;第一个块捕获流程变体的共性,第二个块捕获它们之间的差异。通过这种方式,合并的模型保持尽可能小。此外,该合并模型可以包含所有输入模型的行为,确保输入模型起源的每个元素的追溯,并从合并模型派生任何输入模型。现有的解决方案要么不能满足这些需求,要么只允许合并流程模型对。然而,我们的算法允许同时合并一组流程变量。
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引用次数: 1
Lyapunov stability analysis for self-excitation of induction generators 感应发电机自激的Lyapunov稳定性分析
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852637
Haitao Li, Ziguang Lu
Based on Lyapunov stability theory, a holistic analysis approach is proposed for self-excited induction generator under no-load in the stationary reference frame with the transient mathematic model. Through analysis for initial transient states, a sufficient condition is fixed to be the limit cycle. The analytic formulas of the stator frequency, critical excitation capacitance and critical rotor speed are thus obtained. The self-excitation build-up can then be judged. Good agreement between measured values and calculated values verifies accuracy and validity of the critical analytic formulas, showing generality and engineering application value.
基于李雅普诺夫稳定性理论,提出了一种基于暂态数学模型的稳态参考系下自励感应发电机空载的整体分析方法。通过对初始瞬态的分析,确定了极限环存在的充分条件。得到了定子频率、临界激励电容和转子临界转速的解析公式。然后可以判断自激累积。实测值与计算值吻合良好,验证了关键解析公式的准确性和有效性,具有通用性和工程应用价值。
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引用次数: 0
Global convergence of a class of nonlinear dynamical networks 一类非线性动态网络的全局收敛性
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852232
Ao Dun, Di Liang, Haijing Liu
This paper considers the global convergence of a class of nonlinear dynamical networks, and the subsystems are discrete time pendulum-like systems. Different from most of the existing results, two kinds of interconnections are considered in view of the fact that the subsystems of networks may have more than one kind of interconnection between each other. The Kalman-Yakubovich-Popov (KYP) lemma and the Schur complement formula are applied to get novel criteria, which have the forms of linear matrix inequalities (LMIs). The Kronecker product is presented which can be used to handle a class of LMI problems. The test of the global convergence of a network of pendulum-like systems is separated into the test of the global convergence of several independent pendulum-like systems. Furthermore, a controller design method based on LMIs is provided. Finally, a numerical example is presented to illustrate the efficiency and applicability of the proposed methods.
考虑一类非线性动态网络的全局收敛性,其子系统为离散时间类摆系统。与现有的大多数结果不同,考虑到网络的子系统之间可能存在一种以上的互连,本文考虑了两种互连。利用Kalman-Yakubovich-Popov (KYP)引理和Schur补公式,得到具有线性矩阵不等式(lmi)形式的新判据。提出了可用于处理一类LMI问题的Kronecker积。将一类类摆系统网络的全局收敛性检验分为若干独立类摆系统的全局收敛性检验。在此基础上,提出了一种基于lmi的控制器设计方法。最后通过一个算例说明了所提方法的有效性和适用性。
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引用次数: 0
Analysis of population controllability and prediction of population structure based on constraint system 基于约束系统的人口可控性分析与人口结构预测
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852437
Yue Xiao-ning, Meng Zhao-jia, Xie Feng-dan
It is established that population structure prediction time-varying restriction system model, and its controllability of the system is analyzed through grey system theory and control theory. Based on Liapunov central limit theorem, the conclusion that child-bearing age of women is subject to the normal distribution is obtained, and the density function of fertility age is given. Fertility restricted function is introduced, and we define population migration quantity as control variable, and state feedback gain matrix is established by fertility restricted function, on the basis of which, the discrete time-varying population structure restriction system is established, at the same time its controllability is analyzed by the fertility restriction function and population structure is predicted in a closed region. Finally, error analysis is made through the model, and accuracy and dependability of the model are proved.
建立了种群结构预测时变约束系统模型,并运用灰色系统理论和控制理论分析了系统的可控性。根据Liapunov中心极限定理,得出了妇女生育年龄服从正态分布的结论,并给出了生育年龄的密度函数。引入生育限制函数,将人口迁移量定义为控制变量,通过生育限制函数建立状态反馈增益矩阵,在此基础上建立离散时变人口结构限制系统,同时利用生育限制函数分析其可控性,并在封闭区域内预测人口结构。最后通过模型进行误差分析,证明了模型的准确性和可靠性。
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引用次数: 0
Analysis of the key influencing factors of the food industrial enterprises' integrity & credit in China based on DEMATEL method 基于DEMATEL方法的中国食品工业企业诚信信用关键影响因素分析
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852134
L. Hongwei, Yang Caili, Tao Min
The influencing factors indexes system of food industrial enterprises' integrity & credit is constructed from enterprise, government, market, society and consumer. It is difficult to decide accurately which factor has the greatest influence and influenced degree on the integrity & credit because there are the complicated, interactive and restrictive influencing relations between each pair of the influencing factors in the practical process of its building and management. In order to solve it, we consider the direct influence and restriction relations among the influencing factors, and calculate the integrative influence and influenced degrees of each factor by DEMATEL (Decision-Making Trial and Evaluation Laboratory) approach. It is concluded that the key influencing factors are enterprise's development strategy, the quality of the ordinary employees, market information asymmetry, food production technology and the production process, the quality of manager, quality safety admittance system, the construction of social honesty and faith. Some advice is proposed to improve food industrial enterprises' integrity & credit.
从企业、政府、市场、社会和消费者四个方面构建了食品工业企业诚信信用影响因素指标体系。由于在诚信信用建设和管理的实际过程中,每一对影响因素之间存在着复杂的、相互制约的影响关系,因此很难准确地确定哪一个因素对诚信信用的影响最大和影响程度。为了解决这一问题,我们考虑了影响因素之间的直接影响和制约关系,并采用DEMATEL (decision - decision Trial and Evaluation Laboratory)方法计算了各因素的综合影响和影响程度。企业发展战略、普通员工素质、市场信息不对称、食品生产技术和生产过程、管理者素质、质量安全准入制度、社会诚信建设是影响食品质量的关键因素。提出了提高食品工业企业诚信信用的建议。
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引用次数: 0
Tuning method of proportional differential controller for delay-time system based on polynomial approximation 基于多项式逼近的时滞系统比例微分控制器整定方法
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852200
Ling Xu, F. Ding, Dengfeng Liu, Baoguo Xu
This paper proposes a design method of the proportional integral derivative controller. The controller is used to a delay-time system. A polynomial approximation method is studied to the delay-time system. The controller is designed based on the approximation model and used to the delay-time system. Some numerical examples are illustrated to show the effective of the proposed method.
提出了一种比例积分导数控制器的设计方法。该控制器用于延时系统。研究了时滞系统的多项式逼近方法。该控制器基于逼近模型设计,并应用于时滞系统。算例表明了该方法的有效性。
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引用次数: 0
Launch control strategy for AMT vehicles based on ADRC 基于自抗扰控制器的AMT车辆启动控制策略
Pub Date : 2014-07-14 DOI: 10.1109/CCDC.2014.6852252
G. Yuan, Liu Qifang, Li Chao, Chen Hong
Launch control is a complex issue which requires keeping the engine running, making the launch process of the vehicle smooth and fast. According to the diversity and the uncertainty of launch conditions and the complex control requirements, an active disturbance rejection controller (ADRC) is designed by the speed tracking control. Moreover, a model of the clutch system is given based on the dynamics of the system, which is a second-order equation. In order to verify the controller's effectiveness, a powertrain model of a medium-sized truck about AMT vehicles is established. The model includes an engine, a clutch, a transmission, a main reducing gear and wheels. And some simulations are carried out in various working conditions according to the actual situation. Compared the performance to the traditional PID controller's and analyzing the results of simulations, the active disturbance rejection controller provides a good performance in AMT vehicles' launch progress and shows good adaptability in various working conditions.
发射控制是一个复杂的问题,它需要保持发动机的运转,使飞行器的发射过程平稳、快速。针对发射条件的多样性和不确定性以及复杂的控制要求,采用速度跟踪控制设计了自抗扰控制器。在此基础上,建立了离合器系统动力学模型,该模型为二阶方程。为了验证该控制器的有效性,以某中型卡车为例,建立了AMT车辆的动力系统模型。该车型包括发动机、离合器、变速器、主减速齿轮和车轮。并根据实际情况在各种工况下进行了仿真。通过与传统PID控制器的性能比较和仿真结果分析,该自抗扰控制器在AMT车辆的启动过程中表现出良好的性能,对各种工况具有良好的适应性。
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引用次数: 1
期刊
The 26th Chinese Control and Decision Conference (2014 CCDC)
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