检索结果-内蒙古大学图书馆

Fast approximate matching of binary codes with distinctive bits

Frontiers of Computer Science 2015年第5期9卷 741-750页

作者： Chenggang Clarence YAN Hongtao XIE Bing ZHANG Yanping MA Qiong DAI Yizhi LIU Institute of Information Engineering Chinese Academy of Sciences National Engineering Laboratory for Information Security Technologies Beijing 100093 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Automation Tsinghua University Beijing 100083 China School of Physics Beijing Institute of Technology Beijing 100081 China School of Information Science and Engineering Ocean University of China Qingdao 266100 China School of Computer Science and Engineering Hunan University of Science and Technology Xiangtan 411201 China

Although the distance between binary codes can be computed fast in Hamming space, linear search is not practical for large scale datasets. Therefore attention has been paid to the efficiency of performing approximate nearest neighbor search, in which hierarchical clustering trees （HCT） are widely used. However, HCT select cluster centers randomly and build indexes with the entire binary code, this degrades search performance. In this paper, we first propose a new clustering algorithm, which chooses cluster centers on the basis of relative distances and uses a more homogeneous partition of the dataset than HCT has to build the hierarchical clustering trees. Then, we present an algorithm to compress binary codes by extracting distinctive bits according to the standard deviation of each bit. Consequently, a new index is proposed using compressed binary codes based on hierarchical decomposition of binary spaces. Experiments conducted on reference datasets and a dataset of one billion binary codes demonstrate the effectiveness and efficiency of our method.

关键词： binary codes approximate nearest neighbor search hierarchical clustering index

来源：评论

学校读者我要写书评

暂无评论

Ancestral reconstruction with duplications using binary encoding and probabilistic model 7

Ancestral reconstruction with duplications using binary enco...

引用

7th International Conference on Bioinformatics and Computational Biology, BICOB 2015

作者： Zhou, Lingxi Feng, Bing Yang, Ning Tang, Jijun Tianjin Key Laboratory of Cognitive Computing and Application Tianjin University China Department of Computer Science and Engineering University of South Carolina United States School of Automation Northwestern Polytechnical University China

ISBN: (纸本)9781880843994

A number of approaches have been developed using gene order data to conduct research on both ancestral genomic inference and phylogenetic reconstruction. When investigating species divergence and evolution, gene order data has several inherent advantages that enable researchers to determine a more detailed evolutionary scenario. In this study, we propose a framework to integrate free gene and whole genome duplications with gene additions and losses and rearrangements under probabilistic models to infer the gene order of an ancestor and name it PMAG++. We configured a series of experiments to evaluate the performance of PMAG++ on simulated data and we concluded that it can reconstruct ancestral genome content and orientation with high accuracy and efficiency. Copyright ISCA, BICOB 2015.

关键词： Genes

来源：评论

学校读者我要写书评

暂无评论

SHREC'15 track: 3D object retrieval with multimodal views 8

SHREC'15 track: 3D object retrieval with multimodal views

引用

8th Eurographics Workshop on 3D Object Retrieval, 3DOR 2015

作者： Gao, Yue Liu, Anan Nie, Weizhi Su, Yuting Dai, Qionghai Chen, Fuhai Chen, Yingying Cheng, Yanhua Dong, Shuilong Duan, Xingyue Fu, Jianlong Gao, Zan Guo, Haiyun Guo, Xin Huang, Kaiqi Ji, Rongrong Jiang, Yingfeng Li, Haisheng Lu, Hanqing Song, Jianming Sun, Jing Tan, Tieniu Wang, Jinqiao Yin, Huanpu Zhang, Chaoli Zhang, Guotai Zhang, Yan Zhao, Chaoyang Zhao, Xin Zhu, Guibo School of Medicine University of North Carolina Chapel Hill United States School of Electronic Information Engineering Tianjin University China Department of Automation Tsinghua University China School of Information Science and Engineering Xiamen University China Center for Research on Intelligent Perception and Computing Institute of Automation Chinese Academy of Sciences China National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences China College of Computing and Digital Media DePaul University United States School of Computing Tianjin University of Technology China School of Computer Science and Information Engineering Beijing Technology and Business University China

ISBN: (纸本)9783905674781

This paper reports the results of the SHREC'15 track: 3D Object Retrieval with Multimodal Views, which goal is to evaluate the performance of retrieval algorithms when multimodal views are employed for 3D object representation. In this task, a collection of 505 objects is generated and both the color images and the depth images are provided for each object. 311 objects are selected as the queries and average retrieval performance is measured. The track attracted six participants and the submission of 26 runs, to two tasks. The evaluation results show a promising scenario about multimodal view-based 3D retrieval methods, and reveal interesting insights in dealing with multimodal data. © The Eurographics Association 2015.

关键词： Information retrieval

来源：评论

学校读者我要写书评

暂无评论

A Survey of Blue-Noise Sampling and Its Applications

引用

Journal of Computer Science & Technology 2015年第3期30卷 439-452页

作者：严冬明郭建伟王斌张晓鹏 Peter Wonk Visual Computing Center King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100190 China School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Engineering Arizona State University Tempe AZ 85287 U.S.A.

In this paper, we survey recent approaches to blue-noise sampling and discuss their beneficial applications. We discuss the sampling algorithms that use points as sampling primitives and classify the sampling algorithms based on various aspects, e.g., the sampling domain and the type of algorithm. We demonstrate several well-known applications that can be improved by recent blue-noise sampling techniques, as well as some new applications such as dynamic sampling and blue-noise remeshing.

关键词： blue-noise sampling Poisson-disk sampling Lloyd relaxation rendering remeshing

来源：评论

学校读者我要写书评

暂无评论

ONE-CYCLE CONTROL APPLIED TO A BIDIRECTIONAL BUCK-BOOST CONVERTER IN ENERGY STORAGE APPLICATIONS

ONE-CYCLE CONTROL APPLIED TO A BIDIRECTIONAL BUCK-BOOST CONV...

引用

Brazilian Power Electronics Conference

作者： Joao T. de Carvalho Neto Andres O. Salazar Department of Computing Engineering and Automation/Federal University of Rio Grande do Norte

ISBN: (纸本)9781479987801

The distributed power storage and distributed power generation units are the basic units for storage and distribution in Microgrids. Some electrical topology of distributed storage units are characterized by the use of bidirectional converters that store energy in a battery bank at certain moments and supply this energy to Microgrid bus when necessary. The control of these bidirectional converters must consider the battery protection against voltage surges and transients, when the batteries are charging, so as the protection of the loads connected to the Microgrid bus, when the battery supplies the energy stored. The One-Cycle Control (OCC) technique has been used in the switching converters to allow fast response to transients, no overshoots and zero steady state error. The objective of this work is to use OCC technique in a bidirectional Buck-Boost converter to charge a battery bank when they are discharged, and to supply the battery energy to the loads when necessary, ensuring protection to the battery and to the loads.

关键词： One-Cycle Control Microgrids Dc-dc converters Storage system Bidirectional converters

来源：评论

学校读者我要写书评

暂无评论

An evolutionary model for efficient transportation networks 7

An evolutionary model for efficient transportation networks

引用

7th International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC 2015

作者： Huang, Ian Chen, Mei Yang, William Qin, Zengchang International School of Beijing Beijing China Department of Electrical Engineering University of Southern California United States Intelligent Computing and Machine Learning Lab Beihang University China School of Automation Science and Electrical Engineering Beihang University China

ISBN: (纸本)9781479986460

In this paper, we present a model to automatically generate efficient transportation networks given a simulated urban environment with predefined population distributions and other physical constraints. Based on the empirical analysis of different topological structures of networks, we found that that the efficiency of transportation networks heavily depends on the layout of the stations. The model uses the genetic algorithm to optimize the spatial distribution of stations. Then, the Minimum Spanning Tree is constructed upon which extra network routes are built to minimize average travel time within the constraint of a network length. Experimental studies of a simulated Beijing subway system showed that our model can generate a network that is 14% more efficient than the current subway system based on the Beijing population distribution and geography. This study can be extended to other transportation systems designs, and other communication networks. © 2015 IEEE.

关键词： Travel time

来源：评论

学校读者我要写书评

暂无评论

Model of three level neutral point clamped converter (NPC) for grid connected photovoltaic systems

Model of three level neutral point clamped converter (NPC) f...

引用

Proceedings of the International Convention MIPRO

作者： Mateja Novak Viktor Šunde Željko Jakopović Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation Zagreb Croatia

Photovoltaic modules as direct converters of solar energy into electrical energy are typically connected to the power grid trough standard two level converters. A photovoltaics system can be connected to the power grid if it can satisfy the IEEE standardized conditions set by the power grid operator. The conditions include limitations of THD factor and current harmonics. Multilevel converters which have a lower THD factor than two level converters can satisfy these conditions and in the same time work at higher switching frequencies lowering the losses and the size of the output filter. The model implemented in Simulink® MATLAB consists of a photovoltaic array, boost dc-dc converter with MPPT control and three level neutral point clamped converter connected to the power grid. The simulation results are presented, analyzed and compared to the standard model with a two level converter to validate the benefits of the usage of multilevel converters for grid connected photovoltaic systems.

关键词： Power harmonic filters Mathematical model Arrays Switching frequency Photovoltaic systems Load modeling Voltage control

来源：评论

学校读者我要写书评

暂无评论

Identifiability and Parameter Estimation of Linear Continuous-time Systems under Irregular and Random Sampling

引用

IFAC-PapersOnLine 2015年第28期48卷 332-337页

作者： Mu, Biqiang Guo, Jin Wang, Le Yi Yin, George Xu, Lijian Zheng, Wei Xing Key Laboratory of Systems and Control Chinese Academy of Sciences Beijing100190 China School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering Wayne State University DetroitMI48202 United States Department of Mathematics Wayne State University DetroitMI48202 United States Department of Electrical and Computer Engineering Technology Farmingdale State College State University of New York FarmingdaleNY11735 United States School of Computing Engineering and Mathematics University of Western Sydney PenrithNSW2751 Australia

This paper considers the problem of identifiability and parameter estimation of single-input-single-output, linear, time-invariant, stable, continuous-time systems under irregular and random sampling schemes. Conditions for system identifiability are established under inputs of exponential polynomial types and a tight bound on sampling density. Identification algorithms of Gauss-Newton iterative types are developed to generate convergent estimate sequences. When the sampled output is corrupted by observation noises, input design, sampling times, and convergent algorithms are intertwined. Persistent excitation (PE) conditions for strongly convergent algorithms are derived. Unlike the traditional identification, the PE conditions under irregular and random sampling involve both sampling times and input values. Under the given PE conditions, iterative and recursive algorithms are developed to estimate the original continuous-time system parameters. The corresponding convergence results are obtained. Several simulation examples are displayed to verify the theoretical results. © 2015

关键词： Continuous time systems Iterative methods Lyapunov methods Nonlinear control systems Parameter estimation Sampling convergence and asymptotical normality Estimation algorithm Identifiability Irregular sampling Linear continuous time system Non linear least squares

来源：评论

学校读者我要写书评

暂无评论

Distributed event-triggered bipartite consensus for multiple agents over signed graph topology

Distributed event-triggered bipartite consensus for multiple...

引用

第三十四届中国控制会议

作者： Jinzhou Zeng Fangyuan Li Jiahu Qin Wei Xing Zheng Department of Automation University of Science and Technology of China School of Computing Engineering and Mathematics University of Western Sydney

ISBN: (纸本)9781467374439

The aim of this paper is to address the bipartite consensus for multi-agent systems with directed and undirected graph topologies, using distributed event-triggered control under the assumption that the interactions of agents can be described by a weighted, signed, structurally balanced graph. In this paper, we present a distributed event-triggered control method, where the feedback control law is based on the information from its own latest observations and its neighbors', to deal with the bipartite consensus under both undirected and directed topologies. It is proven that the single-integrator multi-agent systems can reach bipartite consensus under the trigger condition if the network topology is undirected and connected or directed and strongly connected. Some simulations are presented to illustrate the theoretical results.

关键词： Distributed event-triggered,bipartite consensus,single-integrator,signed graph,multi-agent systems.

来源：评论

学校读者我要写书评

暂无评论

Minimum loss control of interior permanent magnet traction motor

Minimum loss control of interior permanent magnet traction m...

引用

IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Tino Jerčic Damir Žarko Jadranko Matuško Marijan Martinovic Department of Electrical Machines Drives and Automation University of Zagreb Faculty of Electrical Engineering and Computing Zagreb Croatia

This paper presents a new formulation for minimization of copper and iron losses in interior permanent magnet for the purpose of minimum loss control. Motor losses are formulated based on electromagnetic torque to total torque ratio resulting in simplified expression of minimal loss condition which can be easily solved online. The flux-weakening method which adjusts electromagnetic to total torque ratio in order to achieve field weakening operation is also proposed.

关键词： Permanent magnet motors Torque Traction motors Temperature measurement Minimization Trajectory Synchronous motors

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：