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Transformerless photovoltaic inverter system based on multilevel voltage

Transformerless photovoltaic inverter system based on multil...

引用

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

作者： Chen, Lezhu Zhang, Qingwei Jiang, Zhengye Sun, Chunhu School of Electrical Engineering and Information Anhui University of Technology Maanshan 243002 China State Key Lab. of Power System Tsinghua University Beijing 100084 China

ISBN: (纸本)9781457721175

It is analyzed detailed the mechanism of common mode current for the transformer-less photovoltaic inverter system. Different control methods are used to analyze the common mode current of single-phase transformer-less full-bridge topology, and some new topologies are also analyzed and simulated. Finally, a new high-efficiency transformer-less photovoltaic generation system which is based on single-phase hybrid clamped three-level inverter is in further research. © 2012 IEEE.

关键词： Topology

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Study on the automatic control system for the shaft furnace section

Study on the automatic control system for the shaft furnace ...

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

作者： Chen, Lezhu Jiang, Zhengye Zhang, Qingwei Sun, Chunhu School of Electrical Engineering and Information Anhui University of Technology Maanshan 243002 China State Key Lab. of Power System Tsinghua University Beijing 100084 China

ISBN: (纸本)9781457721175

The technology of the shaft furnace section in the pellet production has its special technical characteristics, this paper presents an intelligent control system for integrated optimization of production targets in the shaft furnace section. Then we proposed the hardware configuration, network configuration and control functions of the shaft furnace roasting process based on the Siemens Profibus-DP Fieldbus and industrial Ethernet. The WINCC monitor screen is given to reflect the centralized management and decentralized control in the shaft furnace of a steel company. © 2012 IEEE.

关键词： Process control

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Energy-efficient network routing with discrete cost functions

Energy-efficient network routing with discrete cost function...

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9th Annual Conference on Theory and Applications of Models of Computation, TAMC 2012

作者： Wang, Lin Fernández Anta, Antonio Zhang, Fa Hou, Chenying Liu, Zhiyong Key Lab. of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences China Institute IMDEA Networks Spain China State Key Lab. for Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China Graduate University of Chinese Academy of Sciences China

ISBN: (纸本)9783642299513

Energy consumption is an important issue in the design and use of networks. In this paper, we explore energy savings in networks via a rate adaptation model. This model can be represented by a cost-minimization network routing problem with discrete cost functions. We formulate this problem as an integer program, which is proved to be NP-hard. Then a constant approximation algorithm is developed. In our proposed method, we first transform the program into a continuous-cost network routing problem, and then we approximate the optimal solution by a two-step rounding process. We show by analysis that, for uniform demands, our method provides a constant approximation for the uniform network routing problem with discrete costs. A bicriteria network routing problem is also developed so that a trade-off can be made between energy consumption and network delay. Analytical results for this latter model are also presented. © 2012 Springer-Verlag.

关键词： Network routing

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Calibration of field-mill instrument for measuring DC electric field

Calibration of field-mill instrument for measuring DC electr...

引用

2012 International Conference on High Voltage Engineering and Application, ICHVE 2012

作者： Zhang, Bo Wang, Wenzhuo He, Jinliang Zeng, Rong Yin, Han State Key Lab. of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781467347464

The measurement of DC electric field is of great significant. This paper introduces the structure and working principle of the field-mill instrument firstly. Then the calibration method of field-mill instrument in a uniform space-charge-free field is introduced and the error in the calibration is studied by numerical calculation. The calibration coefficient is corrected to be more accurate afterwards. At last, the interaction between the field-mill instruments is discussed. By means of numerical calculation, the shortest distance between two field-mill instruments which can control the measurement error less than 5% is put forward. © 2012 IEEE.

关键词： Calibration

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Tele-AR system based on real-time camera tracking

Tele-AR system based on real-time camera tracking

引用

2012 International Conference on Virtual Reality and Visualization, ICVRV 2012

作者： Wang, Yanke Zhong, Fan Li, Chao Xiang, Hui Peng, Qunsheng Qin, Xueying School of Computer Science and Technology Shandong University Jinan China Shandong Provincial Key Laboratory of Network Based Intelligent Computing Jinan China State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9780769548364

We propose a visual tele-AR system, which is a combination of tele-existence and AR techniques. By wearing a video see-through HMD and moving his head, a user in this system is able to tele-operate a remote pan-tilt platform to observe the remote scene. Unlike traditional tele-existence systems which use mechanical or magnetic sensors for tele-operation, we propose a novel tele-operation method based on real-time tracking of master and slave cameras. The master camera is a component of the video see-through HMD mounted in front of user's eyes, while the slave camera is carried by a remote platform. We estimate use's head motion by tracking the master camera in real time, and translate head motions into motion commands to drive the remote pan-tilt platform. Ideally, motion of the remote platform will be exactly the same as user's head. Unfortunately, motion speed of the slave platform is usually limited by their mechanical capability, which may cause pose inconsistence between master and slave cameras, especially when user's head moves fast. We solve this problem by also tracking slave camera in real time, and warping video images according to difference between master and slave camera pose. Since slave camera is tracked, we can integrate virtual objects into remote scene, giving the user an augmented visual sense. To reduce system delay, our implementation is accelerated GPU parallel computation. Experimental results show the efficiency and robustness of our method. © 2012 IEEE.

关键词： Augmented reality

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Detect the different structures of vegetation patches using circular hough transform at Gudong oil field

Detect the different structures of vegetation patches using ...

引用

2012 9th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2012

作者： Liu, Qingsheng Huang, Dan Chu, Xiaolei State Key Lab. of Resources and Environmental Information System Institute of Geographic Science and Natural Resources Research CAS Beijing China School of Surveying and Mapping Engineering Heilongjiang Institute of Technology Harbin China

ISBN: (纸本)9781467300223

The extending phenomenon of vegetation community caused by seismic exploration of Shengli Oil Field has been found in the many areas of the Yellow River Delta. The spatial structure of vegetation community is believed to have an influence on the landscape pattern and functions of wetland ecosystem. Numbers, areas, shapes and locations of vegetation community patch are the important parameters for vegetation function and structure researches. In this paper, Vegetation community patches with the different spatial shapes are extracted from SPOT 5 high spatial resolution fusion images using Circular Hough Transform (CHT). The total detection accuracy of the patches is about 89.4%. The experiments show that CHT is simple and effective for detecting vegetation patches from the SPOT 5 high resolution fusion images. © 2012 IEEE.

关键词： Vegetation

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Irregular community discovery for cloud service improvement

Irregular community discovery for cloud service improvement

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作者： Liu, Jin Zhou, Jing Wang, Junfeng Zhang, Feng Liu, Fei State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China Lab. of Complex Systems and Intelligence Science Institute of Automation CAS Beijing 100190 China State Key Lab. for Novel Software Technology Nanjing University Nanjing China School of Computer Science Communication University of China Beijing 100024 China Key Lab. of Intelligent Information Processing Institute of Computing Technology CAS Beijing 100190 China College of Computer Science Sichuan University Chengdu 610064 China Software School Sun Yat-sen University Guangzhou 510006 China

Utility services provided by cloud computing rely on virtual customer communities forming spontaneously and evolving continuously. Clarifying the explicit boundaries of these communities is thus essential to the quality of utility services in cloud computing. Communities with overlapping features or prominent peripheral vertexes are usually typical irregular communities. Traditional community identification algorithms are limited in discovering irregular topological structures from CR networks, whereas these irregular shapes typically play an important role in finding prominent customers which are ignored in social CRM otherwise. We present a novel method of discovering irregular communities. It firstly finds and merges primitive maximal cliques and the irregular features of overlapping and prominent sparse vertices are further considered. An empirical case and a methodology comparison confirm the feasibility and efficiency of our approach. © 2012 Springer Science+Business Media, LLC.

关键词： Cloud computing

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Improvement of lifetime model on accelerated thermal aging of oil-paper

Improvement of lifetime model on accelerated thermal aging o...

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2012 International Conference on High Voltage Engineering and Application, ICHVE 2012

作者： Zhao, Xianping Wang, Yaolong Chen, Lei Yang, Lijun Qi, Chaoliang Co. Ltd. Kunming 650051 China State Key Lab. of Transmiss. and Distribution Equipments and Power System Safety and New Technology Chongqing University Shapingba District Chongqing 400044 China

ISBN: (纸本)9781467347464

In order to improve the lifetime time model of oil-paper to obtain the more accurate prediction results, the influence of initial moisture contents and temperatures on aging properties of oil-paper was investigated. Firstly, oil-paper samples with four different moisture contents were aged at three temperatures. Degree of Polymerization (DP) of paper was measured as indicator of aging degree. The variation of DP with aging time was studied by introduction of kinetic equation of cellulose degradation accumulation. Secondly, based on the time-temperature superposition (TTSP) method, a time-temperature-moisture superposition (TTSMP) method was proposed to improve the lifetime model. It is indicated that by comparing with previous lifetime model, the merit of the improved one is that not only temperature but also initial moisture content in paper is considered, which is helpful for making more rational estimation of insulation lifetime during long time aging. © 2012 IEEE.

关键词： Moisture

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PD pattern recognition using S transform and two-directional two-dimensional principal component analysis

PD pattern recognition using S transform and two-directional...

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2012 International Conference on High Voltage Engineering and Application, ICHVE 2012

作者： Wu, Gaolin Xu, Ruilin Wang, Ke Wang, Qian Yang, Yan Meng, Xian Chongqing Electric Power Test and Research Institute Chongqing 401123 China State Key Lab. of Transmiss. and Distribution Equipments and Power System Safety and New Technology Chongqing University Shapingba District Chongqing 400044 China

ISBN: (纸本)9781467347464

This paper presents a feature extraction algorithm combining S transform (ST) and two-directional two-dimensional principal component analysis ((2D) 2 PCA) for partial discharge (PD) pattern recognition. S transform (ST) is firstly employed to obtain a time-frequency representation of the recorded UHF signals. Then, (2D)2 PCA is applied to compress the ST amplitude(STA) matrices to extract various feature vectors with different (d1, d2) combinations, i.e. (5, 5), (5, 10), (10, 5) and (10, 10). The extracted features are examined by both PSO-SVM classifier and BPNN. Experimental results show that the classification accuracies by PSO-SVM are all higher than that by BPNN under four circumstances of (d1, d2) combinations. The success rates of the PSO-SVM with the four feature vectors are above 94% in all cases. It can be found that the proposed feature extraction and classification algorithm can be effectively applied to PD pattern recognition. © 2012 IEEE.

关键词： Support vector machines

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Comparison of Different Spatial Resolution Bands of SPOT 5 to Plant Community Patch Detection

Comparison of Different Spatial Resolution Bands of SPOT 5 t...

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International Congress on Image and Signal Processing

作者： Qingsheng LIU Gaohuan LIU Xiaolei CHU State Key Lab. of Resources and Environmental Information System School of Surveying and Mapping Engineering Heilongjiang Institute of Technology

ISBN: (纸本)9781467309653

The extending phenomenon of plant community patches caused by seismic exploration of Shengli Oil Field has been found in the many areas of the Yellow River Delta. Successful management of extensive areas at plant community-level resolution first requires an efficient, cost-effective means of plant community classification and mapping. We evaluated the influence of different spatial resolution data on the accuracy of plant community map created from SPOT 5 satellite imagery of Gudong Oil Field in Yellow River Delta. Plant community patches were detected from SPOT 5 panchromatic band and multispectral bands based on patch shape. Detection accuracy was assessed using the visual interpretation results. Detection results created from SPOT 5 panchromatic band had higher overall accuracy (85.9%) than from multispectral bands (70.5%). Given the same detection method, high resolutions (2.5 m pixels) panchromatic band had potential to provide high detection accuracies, the SPOT 5 panchromatic band and multispectral bands were well-suited for detecting plant community patches in Gudong Oil Field and similar areas of Yellow River Delta. Practical procedures for plant community patch detection and accuracy assessment are presented for use by natural resource and environmental protection managers.

关键词： SPOT 5 Panchromatic Multispectral Plant community patch Detection Yellow River Delta

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