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Long-term adaptive informative path planning for scalar field monitoring using cross-entropy optimization

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Science China(Information Sciences) 2019年第5期62卷 26-28页

作者： Yang LI Rongxin CUI Weisheng YAN demin xu Research & Development Institute of Northwestern Polytechnical University in Shenzhen School of Marine Science and Technology Northwestern Polytechnical University

Dear editor,Robots are extensively used in various civil and military applications [1, 2]. In the last decade, informative path planning (IPP) has been one of the most important research areas in modern robot engineer... 详细信息

关键词： Long-term adaptive informative path planning for scalar field monitoring using cross-entropy optimization exp length

Robust Self-Triggered Min-Max Model Predictive Control for Linear Discrete-Time Systems

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Robust Self-Triggered Min-Max Model Predictive Control for L...

The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst

第36届中国控制会议

作者： Changxin Liu Jian Gao Huiping Li demin xu School of Marine Science and Technology Northwestern Polytechnical University

ISBN: (纸本)9781538629185

In this paper,we propose a self-triggered robust model predictive control（MPC） algorithm for constrained linear discrete-time systems subject to additive ***,worst case scenarios are considered in the MPC problem formulation to achieve robust constraint ***,a self-triggered control scheduler is proposed to minimize the frequency of performing optimization and the closed-loop system is shown to be recursive feasible and input-to-state practical stable in its region of ***,a numerical example demonstrates the effectiveness of the proposed control strategy.

关键词： Self-triggered control model predictive control(MPC) robust control linear discrete-time systems

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Chinese Science Bulletin 2002年第10期47卷 810-813页

作者： ZHANG Mingge xu demin HONG Han GUO Cunyue HU Youliang State Key Lab of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing Lab of CatalysisKey Lab ot Catalysis of China National Petroleum CorporationBeijing 100080China Graduate School of the Chinese Academy of Sciences Beijing 100030China

SiO2/rac-Me2Si[2-Me-4-Naph-Ind]2ZrCl2 was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.

关键词： metallocene co-catalyst supporting morphology of polypropene.

Preparation of long-branched polyethylene by in situ poly-merization using late transition metal and metallocene catalysts

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Chinese Science Bulletin 2001年第24期46卷 2054-2057页

作者： LIU Zhongyang GUO Cunyue MAZhi WANG Jun xu demin HE Dawei HU Youliang State Key Lab of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China Beijing Lab of Catalysis China National Petroleum Corporation Key Lab of CatalysisBeijing 100080China

An in situ polymerization method was investigated to prepare long-branched polyethylene (LBPE) with ethylene alone and a single cocatalyst, methylalumoxane (MAO), by using a dual functional catalytic system containing late transition metal oligomerization catalyst and metal-locene copolymerization catalyst. The obtained long-branched polyethylene has the characteristics of low melting point, high activity and well-dispersed sequence distribution.

关键词： long-branched polyethylene in situ polymerization late transition metal catalyst metallocene catalyst.

Synchronization of multiple autonomous underwater vehicles without velocity measurements

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Science China(Information Sciences) 2012年第7期55卷 1693-1703页

作者： CUI RongXin,YAN WeiSheng & xu demin College of Marine Engineering,Northwestern Polytechnical University,Xi’an 710072,China College of Marine Engineering Northwestern Polytechnical University Xi’an China

In this paper,we investigate the synchronization control of multiple autonomous underwater vehicles (AUVs),considering both state feedback and output feedback *** multiple AUVs as a graph,we define the tracking error of each AUV with both its own tracking error and the relative position errors with respect to its neighbors taken into *** analysis is used to derive the control law for each *** the output feedback case,a passive filter is used to compensate for the unknown relative velocity errors among AUVs,and an observer is employed to estimate the velocity of the AUV *** mathematical proof is provided for the proposed algorithms for both state feedback and output feedback *** are provided to demonstrate the effectiveness of the proposed *** is shown that,the synchronization error is smaller in the case of considering the relative errors between AUVs than in the case of considering the tracking error of the single AUV only.

关键词： autonomous underwater vehicle synchronization tracking control formation control

ISOTACTIC POLYPROPENE PREPARED USING MgCl2 SUPPORTED ZIEGLERNATTA CATALYSTS CONTAINING NOVEL DIETHER DONORS

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ISOTACTIC POLYPROPENE PREPARED USING MgCl2 SUPPORTED ZIEGLER...

Bayes数据融合方法及其在水下目标检测中的数学仿真验证

International Symposium on Engineering Plastics EP’2001 Beijing

作者： demin xu Cunyue Guo Minge Zhang Yucai Ke Youliang Hu State Key Laboratory of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of Sciences

In recent years,the MgCl-supported catalysts containing diethers as internal donors shown very high activity,isotaticity and sensitivity toward hydrogen,thus making them to be competitive with heterogeneous catalysts,which are commercially used at *** to the stability of diethers toward AlEt,they can not be extracted from the catalysts and the external donors are not needed in the *** a scientific

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西北工业大学学报 2000年第1期18卷 94-97页

作者：高立平徐德民西北工业大学航海工程学院陕西西安710072

对基于 Bayes判决法的模式分类方法进行了理论分析 ,将多变量 Bayes模式分类方法应用于决策信息融合过程 ,证明了用多传感器测得的多维信息进行决策融合性能优于用单传感器测得的一维信息。将基于 Bayes判决法的数据融合方法用于水下目... 详细信息

对基于 Bayes判决法的模式分类方法进行了理论分析 ,将多变量 Bayes模式分类方法应用于决策信息融合过程 ,证明了用多传感器测得的多维信息进行决策融合性能优于用单传感器测得的一维信息。将基于 Bayes判决法的数据融合方法用于水下目标检测 ,能大大提高系统的目标检测能力 ,理论分析和数学仿真均证明了该方法的有效性。

关键词：数据融合贝叶斯判决法数学仿真水下目标检测

自适应推广Kalman滤波应用于水下被动目标定位

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系统工程与电子技术 2001年第5期23卷 8-10,54页

作者：高磊徐德民任章西北工业大学航海工程学院西安710072

针对在被动方式下进行水下目标定位容易出现滤波发散、收敛速度慢以及精度不高等问题 ,研究了一种修正极坐标系下的自适应推广卡尔曼滤波算法。它能够在线估计虚拟系统噪声的统计特性 ,从而消除了动态模型线性化误差带来的不良影响。仿... 详细信息

针对在被动方式下进行水下目标定位容易出现滤波发散、收敛速度慢以及精度不高等问题 ,研究了一种修正极坐标系下的自适应推广卡尔曼滤波算法。它能够在线估计虚拟系统噪声的统计特性 ,从而消除了动态模型线性化误差带来的不良影响。仿真结果表明 ,该算法在收敛速度、估计精度以及稳定性方面都优于常规的卡尔曼滤波器。

关键词：极坐标卡尔曼滤波水下目标定位器声纳

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三渠道回收模式下闭环供应链混沌控制研究

复杂系统与复杂性科学 2020年第1期17卷 55-61,80页

作者：董海徐德珉沈阳大学应用技术学院沈阳110044 沈阳大学机械工程学院沈阳110044

针对制造商、回收商及消费者组成的三级闭环供应链模型,运用混沌控制理论解决三渠道回收模式下闭环供应链混沌控制问题。首先考虑消费者对再制品需求的不确定性,在某一时间段中,对消费者自愿购买再制品数量的数据进行采集,通过K-S检验... 详细信息

针对制造商、回收商及消费者组成的三级闭环供应链模型,运用混沌控制理论解决三渠道回收模式下闭环供应链混沌控制问题。首先考虑消费者对再制品需求的不确定性,在某一时间段中,对消费者自愿购买再制品数量的数据进行采集,通过K-S检验的方法验证该数据服从均匀分布,进一步构建基于决策变量的离散动态模型;其次使用MATLAB软件进行数值仿真模拟,研究回收价格敏感系数和回收价格竞争系数作为固定值时,制造商和两个回收商之间的绘制分岔图、最大Lyapunov指数图、初值敏感分析图,并对系统的混沌特征和初值敏感性进行研究分析;最后采用状态反馈控制和参数调整的方法对混沌系统进行控制。结果表明该方法能有效地改善或消除混沌状态,优化决策行为,提高决策者利润。

关键词：闭环供应链 K-S检验分岔图最大Lyapunov指数图敏感性分析混沌控制