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2016 Seventh International Conference on Intelligent Control and Information Processing (ICICIP)最新文献

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Efficient feature extraction framework for EEG signals classification 脑电信号分类的高效特征提取框架
Weijie Ren, Min Han, Jun Wang, Danxue Wang, Tieshan Li
Feature extraction and classification for EEG signals are key technologies in medical applications. This paper proposes an efficient feature extraction framework that combines hybrid feature extraction and feature selection method. In order to fully exploit information from EEG signals, several feature extraction methods of different types are applied, which are autoregressive model, discrete wavelet transform, wavelet packet transform and sample entropy. After information fusion, feature selection methods are introduced to deal with redundant and irrelevant information, which is advantageous to classification. In this phase, global optimization strategy based on binary particle swarm optimization (BPSO) is presented to enhance the performance of feature selection. To evaluate the results of feature extraction, experiments of class separability are conducted. Classification results on EEG dataset of university of Bonn show the superiority of the proposed method.
脑电信号的特征提取与分类是医学应用中的关键技术。本文提出了一种混合特征提取和特征选择相结合的高效特征提取框架。为了充分挖掘脑电信号中的信息,采用了自回归模型、离散小波变换、小波包变换和样本熵等不同类型的特征提取方法。在信息融合后,引入特征选择方法处理冗余和不相关信息,有利于分类。在此阶段,提出了基于二粒子群算法的全局优化策略,以提高特征选择的性能。为了评价特征提取的效果,进行了类可分性实验。波恩大学EEG数据集的分类结果表明了该方法的优越性。
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引用次数: 17
Discrete-time optimal control scheme based on Q-learning algorithm 基于q -学习算法的离散时间最优控制方案
Qinglai Wei, Derong Liu, Ruizhuo Song
This paper is concerned with optimal control problems of discrete-time nonlinear systems via a novel Q-learning algorithm. In the newly developed Q-learning algorithm, the iterative Q function in each iteration is required to update on the whole state and control spaces, instead of being updated by a single state and control pair. A new convergence criterion of the corresponding Q-learning algorithm is presented, where the traditional constraints for the learning rates of Q-learning algorithms is relaxed. Finally, simulation results are provided to exemplify the good performance of the developed algorithm.
本文利用一种新的q -学习算法研究离散非线性系统的最优控制问题。在新开发的Q-learning算法中,每次迭代中的迭代Q函数需要在整个状态空间和控制空间上更新,而不是由单个状态和控制对更新。提出了相应的q -学习算法的一个新的收敛准则,放宽了传统的q -学习算法的学习率约束。最后给出了仿真结果,验证了该算法的良好性能。
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引用次数: 1
Data-driven optimal control for a class of unknown continuous-time nonlinear system using a novel ADP method 采用一种新的ADP方法对一类未知连续时间非线性系统进行数据驱动最优控制
Kun Zhang, Huaguang Zhang, He Jiang, Chong Liu
This paper is concerned with the optimal control problem for a class of unknown continuous-time nonlinear system. A system identification method by date-driven model is established to reconstruct the unknown system dynamic by the input-output data. Then considering the optimal control problem, a novel critic neural networks design is proposed based on the policy iteration (PI), where the updating laws of parameters are designed by the normalized gradient descent algorithm and convex optimization method. And the computational burden of cost error get reduced during the iteration procedure using the new method. Based on this adaptive dynamic programming algorithm, the weight convergence is obtained and stability is guaranteed by Lyapunov theory. Finally, two simulation examples are shown to verify the effectiveness of this novel method.
研究一类未知连续时间非线性系统的最优控制问题。建立了一种基于数据驱动模型的系统辨识方法,利用输入输出数据对未知系统进行动态重构。然后考虑最优控制问题,提出了一种基于策略迭代(PI)的批评家神经网络设计,其中参数的更新规律采用归一化梯度下降算法和凸优化方法设计。该方法在迭代过程中减少了成本误差的计算量。基于该自适应动态规划算法,利用Lyapunov理论保证了权重收敛性和稳定性。最后,通过两个仿真实例验证了该方法的有效性。
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引用次数: 1
Detection of current inefficiencies in copper electrowinning with multivariate data analysis 用多元数据分析方法检测铜电积过程中的电流无效率
Kirill Filianin, S. Reinikainen, T. Sainio
To further advance existing laboratory studies, the influence of different process parameters onto current efficiency was evaluated based on real industrial process history data obtained from conventional electrowinning circuit. Multivariate calibration model under partial least squares algorithm was applied to predict current efficiency in the process. The basic model was developed using values of electrolyte cupric and ferric concentrations, and total current applied. Pairwise interaction of parameters and moving average technique were applied to improve the prediction ability of the calibration. However, model construction based on the entire data set appeared to be unreliable due to high unexplained variance in the target variable, as sensor data were daily averaged. According to cluster analysis and further Monte-Carlo simulation, the phenomena of current inefficiency causing variation in the prediction of current efficiency appeared to be of random nature, i.e. daily averaging brought random variation to the multivariate model. For this reason, the data set was analyzed with multivariate process control charts to reveal the most important samples for predictive control. Multivariate calibration model was obtained using 58 samples, while the original data set contained 214 observations. Using the model, current efficiency values can be predicted on-line based on process sensor data. Multivariate process control tool was proposed in order to effectively monitor electrowinning process and detect current inefficiencies based on direct comparison of predicted and measured values of current efficiency.
为了进一步推进现有的实验室研究,基于从传统电积电路获得的实际工业过程历史数据,评估了不同工艺参数对电流效率的影响。采用偏最小二乘法下的多变量标定模型预测工艺中的电流效率。根据电解液中铜和铁的浓度以及施加的总电流建立了基本模型。采用参数的两两交互作用和移动平均技术提高了标定的预测能力。然而,基于整个数据集的模型构建似乎是不可靠的,因为目标变量的无法解释的方差很大,因为传感器数据是每日平均的。通过聚类分析和进一步的蒙特卡罗模拟,电流无效率导致电流效率预测变化的现象具有随机性,即每日平均给多变量模型带来随机变化。因此,对数据集进行多元过程控制图分析,以揭示预测控制的最重要样本。多元校正模型使用58个样本,而原始数据集包含214个观测值。利用该模型,可以基于过程传感器数据在线预测电流效率值。为了有效地监测电积过程,并根据电流效率预测值与实测值的直接比较,提出了多变量过程控制工具。
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引用次数: 0
Detection of abnormal process behavior in copper solvent extraction by Hotelling T2 and squared prediction error control chart 用Hotelling T2和平方预测误差控制图检测铜溶剂萃取过程异常行为
Kirill Filianin, S. Reinikainen, T. Sainio, H. Helaakoski, Vesa Kyllönen
Once a multivariate model is developed, it can be combined with tools and techniques from univariate statistical process control to form multivariate statistical process control tools. It allows development of advanced process monitoring strategies. In the current study, copper plant history data with multiple variables was successfully treated by principal component analysis to detect abnormal process behavior, particularly, in copper solvent extraction. The multivariate model was based on the concentration levels of main process metals recorded by the industrial on-stream x-ray fluorescence analyzer. Normal operating conditions were defined through control limits that were assigned to Hotelling T2 values on x-axis and to squared prediction error values on y-axis. Samples that were beyond the limits were classified as either systematic or random errors, or outliers. Model testing showed successful application of control limits to detect abnormal behavior of copper solvent extraction process as early warnings. Compared to the conventional univariate techniques of analyzing one variable at a time, the proposed model allows to detect on-line a process failure summarizing information from all process variables simultaneously. The proposed methodology was combined with on-line quality monitoring tool developed by VTT, Technical Research Center of Finland, to visualize the results. Thus, the proposed approach has a potential in on-line industrial instrumentation providing fast, robust and cheap application with automation abilities.
多元模型一旦开发出来,就可以与单变量统计过程控制的工具和技术相结合,形成多元统计过程控制工具。它允许开发高级过程监控策略。在本研究中,利用主成分分析成功地处理了多变量的铜厂历史数据,以检测异常过程行为,特别是铜溶剂萃取过程。多变量模型基于工业现场x射线荧光分析仪记录的主要工艺金属浓度水平。通过x轴上的Hotelling T2值和y轴上的预测误差平方值的控制限来定义正常工作条件。超出限制的样本被归类为系统或随机误差,或异常值。模型试验表明,控制限可以有效地用于铜溶剂萃取过程异常行为的预警。与传统的一次分析一个变量的单变量技术相比,该模型可以同时总结所有过程变量的信息,从而在线检测过程故障。所提出的方法与芬兰技术研究中心VTT开发的在线质量监测工具相结合,使结果可视化。因此,该方法在在线工业仪器中具有潜力,提供快速、鲁棒和廉价的自动化应用。
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引用次数: 0
Dynamic optimization of value-at-risk portfolios with fuzziness in asset management 资产管理中具有模糊性的风险价值组合动态优化
Y. Yoshida
Using fuzzy random variables, a dynamic portfolio model with uncertainty is mentioned for object system. In this approach, the random property is numerated by stochastic expectation and the fuzzy property is also numerated by weights and mean functions. A value-at-risk is introduced to assess the risk of unfavorable paths in investment. Using dynamic programming and mathematical programming, the optimal solutions of a dynamic portfolio problem with VaR is mentioned. An optimization equation is derived and the optimal portfolios are given at each period.
利用模糊随机变量,建立了具有不确定性的目标系统动态投资组合模型。该方法采用随机期望来表示随机属性,同时采用权函数和均值函数来表示模糊属性。引入风险价值来评估投资中不利路径的风险。利用动态规划和数学规划方法,讨论了一类具有VaR的动态投资组合问题的最优解。导出了优化方程,并给出了各时段的最优投资组合。
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引用次数: 0
Echo state networks with double-reservoir for time-series prediction 双储层回声状态网络用于时间序列预测
Chong Liu, Huaguang Zhang, Xianshuang Yao, Kun Zhang
In this paper, a novel model, named double-reservoir echo state networks (DR-ESN), is proposed. DR-ESN is constructed by two reservoirs which are connected in series, thus the performance of abstracting the characteristics from the prediction task is improved. A sufficient condition is provided to ensure the stability of DR-ESN. The batch gradient method and ridge regression method are utilized to optimize the six parameters of DR-ESN and train the readouts, respectively. DR-ESN is verified by two different experiments, chaotic time series prediction and real-valued function time series prediction. The simulation results demonstrates that DR-ESN has a more precise result than leaky-ESN in predicting the time series.
本文提出了一种新的模型——双储层回声状态网络(DR-ESN)。DR-ESN由两个串联的储层构建,提高了从预测任务中提取特征的性能。给出了保证DR-ESN稳定性的充分条件。利用批梯度法和脊回归法分别对DR-ESN的6个参数进行优化和训练。通过混沌时间序列预测和实值函数时间序列预测两种不同的实验验证DR-ESN。仿真结果表明,DR-ESN在预测时间序列方面具有比泄漏回声状态网络更精确的结果。
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引用次数: 5
Fault detection for networked systems with variable packet dropout rate 变丢包率网络系统的故障检测
Xueheng Mei, Xin Li, Hao Su, B. Cai, Lixian Zhang
The paper focuses on the H∞ fault detection problem for a class of networked systems with intermittent measurements. The fault detection filter (FDF) design is formulated as an H∞ filtering problem by using a FDF. The random packet dropouts, which are described by a Bernoulli distributed sequence, are considered to exist in the communication channels. The packet dropout rate (PDR) is uncertain and variable, which is described by a Markov stochastic process. Based on mode-dependent Lyapunov function, sufficient conditions on the existence of a desired FDF are presented such that the filtering error system is stochastically mean-square stable with a prescribed H∞ disturbance attenuation level. Finally, an illustrative example is provided to demonstrate the effectiveness of the designed filter and the necessity of taking the uncertainty and variation of PDR into account in the design process.
研究了一类具有间歇测量的网络系统的H∞故障检测问题。故障检测滤波器(FDF)的设计被表述为一个使用FDF的H∞滤波问题。考虑了通信信道中存在的随机丢包现象,该现象用伯努利分布序列来描述。丢包率是不确定的、可变的,用马尔可夫随机过程来描述。基于模相关Lyapunov函数,给出了期望FDF存在的充分条件,使得滤波误差系统在规定的H∞扰动衰减水平下是随机均方稳定的。最后,通过算例验证了所设计滤波器的有效性,以及在设计过程中考虑PDR的不确定性和变化的必要性。
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引用次数: 1
A attitude control method for spacecraft considering actuator constraint and dynamics based backstepping 一种考虑作动器约束和动力学的航天器姿态控制方法
Xing Huo, A. Zhang, Zhiqiang Zhang, Zhiyong She
A nonlinear control approach for satellite attitude stabilization maneuver is presented. The controller is developed by using backstepping control technique. The non-ideal dynamical behavior of actuators, referred to as actuator dynamics, is investigated. The satellite s attitude is described by MRPs. The satellites dynamic model can be deduced by a general model of actuator dynamics. And this general model actuator can be expressed all actuators possibly for space application. External disturbances and actuator constraints are all considered during this simulation. Simulation results revealed the control validity of the proposed controller.
提出了一种卫星姿态稳定机动的非线性控制方法。采用反步控制技术开发了该控制器。研究了作动器的非理想动力学行为,即作动器动力学。卫星的姿态由MRPs描述。利用作动器动力学的一般模型,可以推导出卫星的动力学模型。该通用模型可以表示空间应用中可能存在的所有作动器。仿真过程中考虑了外部干扰和执行器约束。仿真结果表明了所提控制器控制的有效性。
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引用次数: 2
Automatic clustering approach based on particle swarm optimization for data with arbitrary shaped clusters 基于粒子群优化的任意形状聚类数据自动聚类方法
Genghang Chen, An Song, Chun-Ju Zhang, Xiao-Fang Liu, Wei-neng Chen, Zhi-hui Zhan, J. Zhong, Jun Zhang, Xiao-Min Hu
Recently, partitional clustering approaches based on Evolutionary Algorithms (EAs) have shown promising in solving the data clustering problems. However, with the nearest prototype (NP) rule as the method for decoding, most of them are only suitable for clustering datasets with convex (e.g. hyperspherical) clusters. In this paper, we propose an automatic clustering approach using particle swarm optimization (PSO). A new encoding scheme with a novel decoding method, named the nearest multiple prototypes (NMP) rule, is applied to the PSO-based clustering algorithm to automatically determine an appropriate number of clusters in the procedure of clustering and partition datasets with arbitrary shaped clusters. The algorithm is experimentally validated on both synthetic and real datasets. The results show that the proposed PSO-based approach is very competitive when comparing with two popular clustering algorithms.
近年来,基于进化算法的分区聚类方法在解决数据聚类问题方面表现出了良好的前景。然而,以最接近原型(NP)规则作为解码方法,它们大多只适用于具有凸(如超球面)聚类的数据集。本文提出了一种基于粒子群算法的自动聚类方法。在基于粒子群算法的聚类算法中,提出了一种新的编码方案和一种新的解码方法——最近多原型规则(NMP),在聚类过程中自动确定合适的聚类数量,并用任意形状的聚类对数据集进行划分。该算法在合成数据集和实际数据集上进行了实验验证。结果表明,与两种常用的聚类算法相比,本文提出的基于pso的聚类方法具有很强的竞争力。
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引用次数: 3
期刊
2016 Seventh International Conference on Intelligent Control and Information Processing (ICICIP)
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