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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Weiyan Wang Yunquan Zhang Long Guoping Shengen Yan Haipeng Jia School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computing Science Institute of Software Chinese Academy of Sciences Lab. of Parallel Software and Computational Science Institute of Software Chinese Academy of Sciences

Scale Invariance Feature Transform (SIFT) is quite suitable for image matching because of its invariance to image scaling, rotation and slight changes in illumination or viewpoint. However, due to high computation complexity it's technically challenging to deploy SIFT in real time application situations. To address this problem, we propose CLSIFT, an OpenCL based highly speeded up and performance portable SIFT solution. Important optimization techniques employed in CLSIFT such as: (1) For less global memory traffic, independent logical functions are merged into the same kernel to reuse data. (2) loop buffers are introduced in for data and intermediate results reusing. (3)Task queue used to schedule threads in the same branch to remove branch divergences. (4) Data partition is based on the statics patterns for workload balance among workgroups. (5) Overlap of CPU time and better parallel strategies are used too. With all mentioned efforts, CLSIFT processes lena. jpg at 74.2 FPS and 43.4FPS respectively on NVidia and AMD GPUS, much higher than CPU's nearly 10 FPS and the known fastest SIFTGPU's 39.8 FPS and 13FPS. Moreover in a quantitative comparison approach we analyze those successful strategies beating SIFTGPU, a famous existing GPU implementation. Additionally, we observe and conclude that NVidia GPU achieves better occupancy and performance due to some factors. Finally, we summarize some techniques and empirical guiding principles that may be shared by other applications on GPU.

关键词： Graphics processing units Instruction sets Kernel Accuracy Histograms Optimization Memory management

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Online joint pricing and booking policies in airline revenue management

Online joint pricing and booking policies in airline revenue...

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6th Annual International Conference on Combinatorial Optimization and Applications, COCOA 2012

作者： Ni, Guanqun Xu, Yinfeng School of Management Xi'an Jiaotong University Xi'an 710049 China State Key Lab. for Manufacturing Systems Engineering Xi'an 710049 China Ministry of Education Key Lab. for Process Control and Efficiency Engineering Xi'an 710049 China

ISBN: (纸本)9783642317699

We introduce a model considering the single-leg revenue management problem from the perspective of online algorithms and competitive analysis. In this model, the price and limitation of bookings are both decision variables. Assuming the process of the customers meets the low-before-high manner and the expected value of customer falls in a closed interval, we analyze the upper bound for deterministic online joint pricing and booking policy and propose one optimal policy for each case. © 2012 Springer-Verlag.

关键词： Economics

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A novel multichannel multiple access protocol for vehicular ad hoc networks

A novel multichannel multiple access protocol for vehicular ...

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2012 IEEE International Conference on Communications, ICC 2012

作者： Ni, Minming Zhong, Zhangdui Zhao, Dongmei State Key Lab. of Rail Traffic Control and Safety Beijing Jiaotong University China Dept. of Electrical and Computer Engineering McMaster University Canada

ISBN: (纸本)9781457720529

A novel multichannel multiple access (MMA) protocol is proposed for vehicular ad hoc networks in this paper. For increasing channel efficiency, two control channels are utilized in MMA to finish request-to-send/clear-to-send (RTS/CTS) interactions and acknowledgments (ACKs) separately. When a collision happens in the control channel, the waiting period before the next re-transmission is adjusted by a relative mobility based back-off scheme. Benefiting from the fully distributed channel selection scheme, which is also included in MMA, the data transmissions carried in the chosen service channels can be successfully accomplished without collision, and the influence of exposed terminals can also be effectively alleviated. Simulation results show that MMA outperforms the classic single channel and multichannel MAC protocols in average channel utilization, packet delay, and packet drop rate. © 2012 IEEE.

关键词： Vehicular ad hoc networks

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An embedded co-AdaBoost and its application in classification of software document relation

An embedded co-AdaBoost and its application in classificatio...

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2012 8th International Conference on Semantics, Knowledge and Grids, SKG 2012

作者： Liu, Jin Li, Juan Xie, Yuan Lei, Jeff Hu, Qiping State Key Lab. of Software Engineering Computer School Wuhan University China State Key Lab. of Intelligent Control and Management of Complex Systems Institute of Automation CAS China Department of Computer Science and Engineering University of Texas Arlington TX United States International School of Software Wuhan University China

ISBN: (纸本)9780769547947

To enhance classification performance by making use of easily availab.e unlab.lled data to overcome the scarcity of lab.lled data, this paper proposes an Embedded Co-Adaboost algorithm that integrates multi-view learning into the Adaboost learning framework and at the same time leverages the advantages of Co-training algorithm for performance enhancement. Experimental results demonstrate the effectiveness of the proposed algorithm in terms of the convergence rate, the accuracy, and the steady performance as compared to the original AdaBoost algorithm, without relying on redundant and sufficient feature sets. As a algorithm application in software engineering, the Embedded Co-AdaBoost has been applied to the classification of software document relations to improve the quality of the architecture design documents and the reusability of design knowledge. © 2012 IEEE.

关键词： Reusability

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Substation-dispatch center two-level distributed state estimation

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Dianli Xitong Zidonghua/Automation of Electric Power Systems 2012年第7期36卷 44-50+91页

作者： Li, Qingxin Sun, Hongbin Wang, Jing Zhang, Boming Wu, Wenchuan Guo, Qinglai State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China

A two-level distributed state estimation method for substation-dispatch center is proposed. After zero impedance three-phase state estimation based on KCL has been applied in substation, up load ripe data are treated in dispatch center level and the single-phase state estimation for all grid implemented. The detailed discussions about the architecture, algorithm, ripe data transmission, time setting and period selection, transmission protocol and transition scheme for the method are given. The results of calculation example show that this method is in favor of simultaneously identifying three-phase bad data and topology error, reducing communication burden, and increasing the reliability of the dispatch center state estimation for all grid. © 2012 state Grid Electric Power Research Institute Press.

关键词： state estimation

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Analysis and Simulation of Laser Polarization Characteristics on Metal Surface in Short-Range Detection

Analysis and Simulation of Laser Polarization Characteristic...

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2012 Conference on Modelling, Identification and control (MIC2012)

作者： Yu-ying Yang Zhan-zhong Cui Shuang-cheng Wei State Key Lab of Mechatronics Engineering and Control Beijing Institute of Technology Department of Arms Engineering Academy of Armored Force Engineering

ISBN: (纸本)9781627483766

In view of using only the intensity information of retroreflection wave and poor capacity of anti-interference in laser short-range detection,this paper analyzes the polarization characteristics of laser beam on the metal surface and establishes reflection model of polarized laser.A target detection method based on polarization characteristics of reflection laser is putted forward and the simulation of polarization characteristics on the surface of several typical metal targets is implemented at last.

关键词： Short-range Detection Polarization Characteristics Stokes Parameters Metal Target

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A novel method for locating PM marker based on magnetic field reconstruction

A novel method for locating PM marker based on magnetic fiel...

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2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012

作者： Shen, Hui-Min Hu, Liang Fu, Xin Lee, Kok-Meng State Key Lab. of Fluid Power Transmission and Control Zhejiang University Hangzhou China George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA United States

ISBN: (纸本)9781457721175

PM marker along with an electrical system sensing its magnetic field is commonly used to determine the parts locations in industry. This paper proposes a novel method combining computation and experiment to improve the localization accuracy of the traditional PM marker approach. Based on the current-free property of the external space of the PM marker (modeled as an ideal dipole), the method computes (reconstructs) the magnetic field in the space by solving a Laplace's equation with measured boundary conditions. Thus, the employ of reconstructed magnetic field with better quality improves the location estimation with higher accuracy. In the paper, the reconstruction and corresponding estimation algorithms are presented firstly. Its effect is then validated on a simulation model by a comparison with traditional PM marker approach, which shows that 80% error is eliminated at most. © 2012 IEEE.

关键词： Magnetic fields

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The finite element simulation study on thermal deformation of ground heat exchange pipe

The finite element simulation study on thermal deformation o...

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2012 2nd International Conference on Electronic and Mechanical engineering and Information Technology, EMEIT 2012

作者： Zhu, Xiaolin Gao, Qing Wang, Youtang Yu, Ming State Key Lab. of Automotive Simulation and Control Jilin University Changchun 130025 China Department of Thermal Energy Engineering Jilin University Changchun 130025 China College of Materials Science and Engineering Jilin University Changchun 130025 China

ISBN: (纸本)9789078677604

During long-time operation, thermal deformation of heat exchange pipe weaken the capability and reduce the reliability of heat transfer system, especially the heat exchange pipe with initial bending in high temperature storage condition will make problem more seriously. The finite element simulation study based on ABAQUS code was carried out to explore thermal deformation behavior of heat exchange pipe and interaction between pipe-soil interfaces, through establishing the typical initial bending model of pipe body and the description of the basic equations The distribution law of effective stress, displacement and plastic strain at feature edges and the cross section were obtained. The result showed that value of effective stress, displacement and plastic strain distribution of soil are cyclical fluctuation change with different bending deflection and bending direction, the location of maximum bending deflection is the most serious heat transfer attenuation areas. © the authors.

关键词： Finite element method

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The study on measuring method of heat exchange pipe deformation and displacement based on thermal strain

The study on measuring method of heat exchange pipe deformat...

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2012 2nd International Conference on Electronic and Mechanical engineering and Information Technology, EMEIT 2012

作者： Wang, Youtang Gao, Qing Zhu, Xiaolin Yu, Ming State Key Lab. of Automotive Simulation and Control Jilin University Changchun 130025 China Department of Thermal Energy Engineering Jilin University Changchun 130025 China College of Materials Science and Engineering Jilin University Changchun 130025 China

ISBN: (纸本)9789078677604

Thermal deformation of heat exchange pipe is the significant source of structural variation in ground heat exchange system, which could weaken the capability and reduce the reliability of heat transfer system after long-time operation. The experimental study of thermal deformation of heat exchange pipe should be carried out to explore its thermal behavior. The strain measuring method was applied to the study on thermal deformation and displacement, which was deduced from the measured strain in heat exchange pipe. The verifying experiment was carried out to analyse its feasibility in preliminary simulation environment. The result showed that strain measuring method is applicable and could be conducive to the deformation monitoring of heat exchange pipe in practical projects. © the authors.

关键词： Deformation

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Prediction error method for identification of LPV models

Prediction error method for identification of LPV models

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作者： Zhao, Yu Huang, Biao Su, Hongye Chu, Jian State Key Lab. of Industrial Control Technology Institute of Cyber Systems and Control Zhejiang University Hangzhou China University of Alberta Department of Chemical and Material Engineering Edmonton AB T6G-2G6 Canada

This paper is concerned with identification of linear parameter varying (LPV) systems in an input-output setting with Box-Jenkins (BJ) model structure. Classical linear time invariant prediction error method (PEM) is extended to the LPV PEM. Under the new LPV framework, identification of two types of input-output LPV models is considered: one is based on parameter interpolation and the other is based on model interpolation. The effectiveness of the proposed solution is validated by comparison with other existing LPV identification approaches through simulation examples and demonstrated by experiment studies. © 2011 Elsevier Ltd. All Rights Reserved.

关键词： Interpolation

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