检索结果-内蒙古大学图书馆

2014 4th IEEE International Conference on Information Science and Technology

作者： Zaijin Li Yangzhou Gan Jing Xiong Jiali Tan Zeyang Xia Qunfei Zhao Harbin Institute of Technology Shenzhen Graduate School Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences and The Chinese University of Hong Kong Guanghua School of Stomatology Hospital of Stomatology Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology

Introduction: Previous studies have shown that applying external vibrational load of a certain frequency and intensity can accelerate the tooth movement, thus shorten orthodontic treatment time. It is believed that the optimal frequency is correlative to the modal mode of the target toothperiodontal ligament(PDL)-bone complex(TPBC). This study aims to investigate modal mode, natural frequencies included,of the TPBC using finite element(FE) method. Methods: A three dimensional TPBC model of a maxillary central incisor were reconstructed from cone beam CT images. A FE model was then created in Ansys 14.5. The tooth, PDL, and bone were meshed with 10-node hexahedral elements(SOLID 187)with the numbers of the elements equaled to 17,803, 4,137,and 32,577, respectively. All parts were considered homogeneous and isotropic. The material properties(Young's Module(Pa),Poisson's ratio and Density(kg/m3) as: 2e10, 0.31 and 1.36e3 for tooth, 4.7e5, 0.4 and 1.1e3 for PDL, and 3.5e9, 0.33 and 1.4e3 for bone, respectively. Fixed constraint was set for the alveolar bone. PCG Lanczos method was used in the modal *** order modes were included in the computation. Result:The first six order modal mode of the TPBC were *** corresponding natural frequencies were 702, 1049, 2713,2805, 3026, and 3530 Hz, respectively. Different tooth movement patterns, including translation, rotation, extrusion/intrusion,were observed in these modal modes. Conclusion: The proposed method is able to obtain the natural frequencies and modal modes of a TPBC. The results can be used as reference for developing vibrational device to accelerate orthodontic tooth movement.

关键词： Modal Analysis of a Tooth-PDL-Bone Complex PDL

来源：评论

学校读者我要写书评

暂无评论

Performance Monitoring of the Data-driven Subspace Predictive control systems Based on Historical Objective Function Benchmark

引用

自动化学报 2013年第5期39卷 542-547页

作者：王陆李柠李少远 Department of Automation Shanghai Jiao Tong UniversityKey Laboratory of System Control and Information ProcessingMinistry of Education of China

In this paper, a historical objective function benchmark is proposed to monitor the performance of data-driven subspace predictive control systems. A new criterion for selection of the historical data set can be used to monitor the controller0s performance, instead of using traditional methods based on prior knowledge. Under this monitoring framework, users can define their own index based on different demands and can also obtain the historical benchmark with a better sensitivity. Finally, a distillation column simulation example is used to illustrate the validity of the proposed algorithms.

关键词：预测控制系统性能监控数据驱动子空间历史基准监视控制器目标函数

来源：评论

学校读者我要写书评

暂无评论

Further Results on the Maximal Contractively Invariant Ellipsoid of Discrete-time Linear systems with Multiple Inputs Subject to Actuator Saturation

Further Results on the Maximal Contractively Invariant Ellip...

引用

IEEE Annual Conference on Decision and control

作者： Yuanlong Li Zongli Lin Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing of Ministry of Education Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia P.O. Box 400743 Charlottesville VA 22904-4743 USA

ISBN: (纸本)9781467360890

Contractively invariant ellipsoids have been extensively used as estimates of the domain of attraction of a linear system under a saturated linear feedback. For a discrete-time linear system with a single input subject to actuator saturation, based on a convex hull representation of the saturated linear feedback, a necessary and sufficient condition for an ellipsoid to be contractively invariant was previously established. Based on this condition, the determination of the maximal contractively invariant ellipsoid can be formulated and solved as an LMI problem. In this paper, we develop a criterion to determine if a contractively invariant ellipsoid is the maximal one for discrete-time saturated linear systems with multiple inputs. This criterion is based on the solution of an LMI problem, which involves a generalized convex hull representation of saturated linear feedbacks, and includes the existing result for discrete-time saturated linear systems with a single input as a special case. Simulation results demonstrate the effectiveness of our results.

关键词： Linear system multi-input discrete-time Invariant discrete time systems linear feedback Saturated convex hull region of attraction

来源：评论

学校读者我要写书评

暂无评论

Two-degree-of-freedom controller Design for MIMO systems with Multiple Time Delays Based on Inversing Decoupling

Two-degree-of-freedom Controller Design for MIMO Systems wit...

引用

第三十二届中国控制会议

作者： ZHANG Wei SUN Boi ZHANG Xi ZHANG Weidongi Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Guangdong power grid corporation

ISBN: (纸本)9781479900305

In this paper,a two-degree-of-freedom(TDOF) controller design method for multi-inputs multi-outputs(MIMO) system with multiple time delays based on inversing decoupling is ***,an inversing decoupling method based on the factorization of the plant is ***,the H2 optimal controller design method is applied to the decoupled single-input/single-output(SISO) system after the system has been ***,a TDOF controller is designed for the decoupled closed-loop *** with other developed methods,the proposed design method has two main advantages. One is that the design procedure is simple and the obtained controllers are given in analytical *** other is that better performance can be achieved since the TDOF control structure can isolate the disturbance from the *** are provided to illustrate the effectiveness of the proposed design approach.

关键词： TDOF MIMO multiple time delays inverse decoupling H2 optimal control

来源：评论

学校读者我要写书评

暂无评论

Adaptive tracking of parametric strict-feedback nonlinear systems in the presence of additive disturbance

Adaptive tracking of parametric strict-feedback nonlinear sy...

引用

第三十二届中国控制会议

作者： WANG Yanxia ZHANG Zhengqiang Rizhao Campus Qufu Normal University School of Electrical Engineering and Automation Qufu Normal University Key Laboratory of System Control and Information Processing Ministry of Education

ISBN: (纸本)9781479900305

In this paper,we consider the same class of systems in a previous paper,i.e.a class of parametric strict-feedback nonlinear systems with additive *** using the backstepping technique,adaptive control algorithm is developed. Unlike the exiting control schemes for systems with additive disturbance,no knowledge is assumed on two time continuous differentiability of the ***,the developed backstepping controller does not require that the uncertain parameters is restricted within a known ***,overestimation of the system parameters is removed by employing the tuning functions *** is shown that the proposed controller not only guarantees global stability,but also asymptotic tracking.

关键词： Adaptive control Nonlinear system Backstepping Asymptotic tracking Disturbance

来源：评论

学校读者我要写书评

暂无评论

LBP-based hierarchical sparse patch learning for face recognition

LBP-based hierarchical sparse patch learning for face recogn...

引用

2013 International Conference on Image processing, Computer Vision, and Pattern Recognition, IPCV 2013, at WORLDCOMP 2013

作者： Zhao, Yue Su, Jianbo Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China

ISBN: (纸本)1601322534

Local Binary Pattern (LBP) features and its variants are computed on the patches with the fixed positions and a fixed size in images, while the limited variety of the size and position cannot accurately measure the nature of face image. In this paper, we propose a new learning method, Hierarchical Sparse Patch Learning (HSPL), to select face patches with different positions and sizes for face recognition. HSPL employs a sparse learning model to hierarchically select patches at two levels: in level 1 the optimal patch candidates are figured out, while in level 2 the optimal patches from the candidates are obtained. LBP features are extracted from the optimal patches to recognize faces. Experimental results show that the proposed method is more efficient and achieves higher recognition rate than the other two compared methods. © 2013 CSREA Press. All rights reserved.

关键词： Local binary pattern

来源：评论

学校读者我要写书评

暂无评论

Optimization for family energy consumption in real-time pricing environment

Optimization for family energy consumption in real-time pric...

引用

2012 International Conference on Emerging Technologies for Information systems, Computing, and Management, ICM 2012

作者： Wu, Weipo Yang, Genke Pan, Changchun Ju, Changjiang Department of Automation and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781461470090

In order to help consumers adapt to electricity consumption in real-time electricity pricing environment, an energy consumption scheme is proposed in this paper. This scheme focuses on the prediction, modeling and optimization for family energy consumption. A method based on support-vector machine (SVM) is used to predict the real-time price (RTP) and the optimization model divides every hour into equal time slots and thus provides more opportunities to schedule household appliances in proper working time. Then the simulation results show that the proposed optimal control model reduces the daily electricity expenditures. © 2013 Springer Science+Business Media New York.

关键词： Costs

来源：评论

学校读者我要写书评

暂无评论

Anti-windup Design for Active Disturbance Rejection control

Anti-windup Design for Active Disturbance Rejection Control

引用

第三十三届中国控制会议

作者： Xiongjun Wu Jiaoni Pang Tao Yang The 802 Institute of Shanghai Academy of Space Flight Technology The Eighth Academy of China Aerospace Science and Technology Corporation Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China ACCESS Linnaeus Centre School of Electrical Engineering Royal Institute of Technology

ISBN: (纸本)9781479947249

An anti-windup compensate algorithm for active disturbance rejection mechanism is proposed in this paper. This paradigm extends the traditional anti-windup scheme to the Active Disturbance Rejection control(ADRC) mechanism, to deal with the input saturation nonlinearity and meanwhile reject the disturbance automatically by using Extended State Observer(ESO). The output of anti-windup compensator is treated as a part of unknown disturbances and is introduced into the ESO, which can online observe both internal and external disturbances(parameter uncertainties and model mismatches). The controller input is yielded by using a nonlinear feedback combination, and it is used to compensate the integrator windup caused by the saturation nonlinearity element. On the other hand, in order to determine the parameters of the ESO and the anti-windup compensator feedback gain, the L2 gain is adopted. The effectiveness and the robustness against model and parameter uncertainties of the proposed method is verified by an example of the seeker platform.

关键词： Actuator saturation,Anti-windup design,Active disturbance rejection,Extended State Observer(ESO),Tracking Differentiator

来源：评论

学校读者我要写书评

暂无评论

Boundary feedback control design and stability of open-channel networks

Communications in Computer and Information Science

引用

Communications in Computer and Information Science 2013年 355卷 342-350页

作者： Cen, Lihui Xi, Yugeng Li, Dewei Cen, Yigang Department of Control Engineering Central South University Changsha China Key Laboratory of System Control and Information Processing Ministry of Education Department of Automation Shanghai Jiaotong University Shanghai China School of Computer and Information Technology Beijing Jiaotong University Beijing China

This paper proposed a boundary feedback control design for open-channel networks with trapezoidal cross sections by using a Riemann invariants approach. The open-channel network is well modeled by the nonlinear Saint-Venant equations. Based on the characteristic form in terms of Riemann invariants, the stabilizing boundary control is developed for a single canal. The stability condition and the boundary control design are subsequently generalized to open-channel networks composed by multireaches in cascade. The design of the boundary feedback control laws either for a single canal or for the cascaded networks is illustrated in a unified design framework. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Feedback control

来源：评论

学校读者我要写书评

暂无评论

A fast network partition method for large-scale urban traffic networks

引用

控制理论与应用（英文版） 2013年第3期11卷 359-366页

作者： Zhao ZHOU Shu LIN Yugeng XI Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education

In order to control the large-scale urban traffic network through hierarchical or decentralized methods, it is necessary to exploit a network partition method, which should be both effective in extracting subnetworks and fast to compute. In this paper, a new approach to calculate the correlation degree, which determines the desire for interconnection between two adjacent intersections, is first proposed. It is used as a weight of a link in an urban traffic network, which considers both the physical characteristics and the dynamic traffic information of the link. Then, a fast network division approach by optimizing the modularity, which is a criterion to distinguish the quality of the partition results, is applied to identify the subnetworks for large-scale urban traffic networks. Finally, an application to a specified urban traffic network is investigated using the proposed algorithm. The results show that it is an effective and efficient method for partitioning urban traffic networks automatically in real world.

关键词： Traffic signal control Large-scale urban traffic networks Network partition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：