检索结果-内蒙古大学图书馆

MR-IDPSO: A Novel Algorithm for Large-Scale Dynamic Service Composition

Tsinghua science and technology 2015年第6期20卷 602-612页

作者： Yanping Zhang Zihui Jing Yiwen Zhang School of Computer Science and Technology Key Laboratory of Intelligent Computing and Signal ProcessingMinistry of EducationAnhui University

In the era of big data, data intensive applications have posed new challenges to the field of service composition. How to select the optimal composited service from thousands of functionally equivalent services but different Quality of Service(Qo S) attributes has become a hot research in service computing. As a consequence,in this paper, we propose a novel algorithm MR-IDPSO(Map Reduce based on Improved Discrete Particle Swarm Optimization), which makes use of the improved discrete Particle Swarm Optimization(PSO) with the Map Reduce to solve large-scale dynamic service composition. Experiments show that our algorithm outperforms the parallel genetic algorithm in terms of solution quality and is efficient for large-scale dynamic service composition. In addition,the experimental results also demonstrate that the performance of MR-IDPSO becomes more better with increasing number of candidate services.

关键词： Map Reduce service composition Quality of Service(

来源：评论

学校读者我要写书评

暂无评论

A Weak Target Detection Method Based on Spatial Power Spectrum Map(SPS-MAP) 9th

A Weak Target Detection Method Based on Spatial Power Spectr...

引用

2017 9th International Conference on Modelling, Identification and Control (ICMIC 2017)

作者： Peng Jin Jinyu Xiong Xiaoyong Zhang Liankun Bo the Science and Technology On Blind Signal Processing Laboratory

ISBN: (纸本)9781509065769;9781509065752

Aiming at the problem that the detection probability of the moving platform using traditional detection method is low and even bad under low SNR condition.A weak target detection method based on spatial power spectrum map(SPS-MAP) is put *** with traditional cross direction finding method,this method omits the step in which the location is determined with the "post processed" SPS peak information and instead maps the SPS curve directly to the search grid to achieve the purpose of location as *** this thesis,the theoretical properties and computational complexity of the method are deduced and *** last,simulation results show that the proposed method can effectively detect targets in low SNR conditions.

关键词： spatial power spectrum direction finding weak target detection passive location mobile platform

来源：评论

学校读者我要写书评

暂无评论

Controlling auto-focusing chirped perfect Laguerre-Gaussian beam to mitigate crosstalk in atmospheric turbulence

引用

Optical and Quantum Electronics 2025年第4期57卷 1-11页

作者： Ma, Yangbin Wang, Xinguang Shen, Yangbo Zhao, Ben Wang, Le Zhao, Shengmei College of Science Nanjing University of Posts and Telecommunications Wenyuan Road Jiangsu Nanjing210023 China Jiangsu Engineering Research Center of Communication and Network Technology Nanjing University of Posts and Telecommunications Wenyuan Road Jiangsu Nanjing210023 China Portland Institute Nanjing University of Posts and Telecommunications Wenyuan Road Jiangsu Nanjing210023 China School of Communications and Information Engineering Nanjing University of Posts and Telecommunications Wenyuan Road Jiangsu Nanjing210023 China Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications New model road Jiangsu Nanjing210003 China Nanjing University of Posts and Telecommunications New model road Jiangsu Nanjing210003 China National Laboratory of Solid State Microstructures Nanjing University Hankou Road Jiangsu Nanjing210093 China

Auto-focusing beams can effectively mitigate orbital angular momentum (OAM) crosstalk in atmospheric turbulence. In this paper, we focus on the effect of the chirp factor on the crosstalk mitigation of chirped perfect Laguerre-Gaussian beam (CPLGB) based on the propagation model of CPLGB. The results demonstrate that a positive first-order chirp factor can significantly promote the auto-focusing of CPLGB, and increasing it can effectively mitigate the intermodal crosstalk of OAM modes in atmospheric turbulence, whereas a positive second-order chirp factor has a relatively weak effect on them. By comparing with Bessel Gaussian beam, perfect Laguerre-Gaussian beam, and perfect optical vortex beam, the CPLGB shows superior turbulence resistance when transmitted in atmospheric turbulence. Our results will be useful for optimizing the performance of free-space optical (FSO) communication systems with CPLGBs. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2025.

关键词： Gaussian beams

来源：评论

学校读者我要写书评

暂无评论

A Novel Special Emitter Identification Method Based on Improved Subclass Discriminant Analysis 2

A Novel Special Emitter Identification Method Based on Impro...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Guiliang Wang Yuanling Huang Science and Technology on Blind Signal Processing Laboratory

Radio frequency fingerprinting(RFF) is used to uniquely identify individual radios by exploiting the radio frequency characteristics. Often attributing to the phase ambiguity, the features of an emitt

ISBN: (纸本)9781467389808

关键词： Special emitter identification Radio frequency fingerprinting Discriminant analysis Feature extraction Pattern recognition Feature extraction discriminant analysis Pattern recognition emitters phase ambiguity Clustering algorithms sample covariance radiofrequency

来源：评论

学校读者我要写书评

暂无评论

A method of Robust low-angle target height and compound reflection coefficient joint estimation

引用

Journal of Systems Engineering and Electronics 2022年第2期33卷 322-329页

作者： WANG Shenghua CAO Yunhe LIU Yutao School of Communications and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710061China Science and Technology on Communication Networks Laboratory Shijiazhuang 050081China National Laboratory of Radar Signal Processing Xidian UniversityXi’an 710071China

It is always a challenging issue for radar systems to estimate the height of a low-angle target in the multipath propagation *** highly deterministic maximum likelihood estimator has a high accuracy,but the errors of the ground reflection coefficient and the reflecting surface height have serious influence on the *** this paper,a robust es-timation method with less computation burden is proposed based on the compound reflection coefficient multipath model for low-angle *** compound reflection coefficient is es-timated from the received data of the array and then a one-di-mension generalized steering vector is constructed to estimate the target *** algorithm is robust to the reflecting sur-face height error and the ground reflection coefficient ***-nally,the experiment and simulation results demonstrate the validity of the proposed method.

关键词： low-angle target robust joint estimation compound reflection coefficient multipath direction of arrival(DOA)

来源：评论

学校读者我要写书评

暂无评论

Target location with signal fitting and sub-aperture tracking for airborne multi-channel radar

引用

Journal of Systems Engineering and Electronics 2010年第5期21卷 752-758页

作者： Zhiwei Yang Guisheng Liao Shun He Cao Zeng National Laboratory of Radar Signal Processing Xidian University Xi'an 710071 E R. China Communication and Information Engineering College Xi'an University of Science and Technology Xi'an 710054 E R. China

The location of a moving target based on signal fitting and sub-aperture tracking from an airborne multi-channel radar is dealt *** proposed approach is applied in two steps：first,the ambiguous slant-range velocity is derived with a modified single-snapshot multiple direction of arrival estimation method,and second,the unambiguous slant-range velocity is found using a track-based *** prominent advantage of the proposed approach is that the unambiguous slant-range velocity can be very ***,the first stage is carried out at the determinate range-Doppler test cell by azimuth searching for fitting best to the moving target signal,therefore,the location performance would not be sacrificed in order to suppress clutter and/or *** effectiveness and efficiency of the proposed method are validated with a set of airborne experimental data.

关键词： space-time adaptive processing（STAP） along track interferometry（ATI） ground moving target indication（GMTI）.

来源：评论

学校读者我要写书评

暂无评论

A new detecting method for weak targets in sea clutter based on multifractal properties

A new detecting method for weak targets in sea clutter based...

引用

6th International Conference on radar, radar 2011

作者： Zhang, D.T. Luo, F. National Key Laboratory of Science and Technology on Radar Signal Processing Xidian University Xi'an Shaanxi China

ISBN: (纸本)9781424484416

The fractal dimension of sea clutter is estimated and its multifractal features are analyzed in this paper. A new method based on the difference between multifractal spectra of sea clutter and target plus sea clutter is proposed to detect targets in sea clutter. The verification of real sea clutter shows that this method is useful and has low computation burden. So it provides a new idea and an effective method to detect low observable targets in sea clutter. © 2011 IEEE.

关键词： Clutter (information theory)

来源：评论

学校读者我要写书评

暂无评论

A Dynamic Transformer Network for Vehicle Detection

引用

IEEE Transactions on Consumer Electronics 2025年

作者： Tian, Chunwei Liu, Kai Zhang, Bob Huang, Zhixiang Lin, Chia-Wen Zhang, David Harbin Institute of Technology School of Computer Science and Technology Harbin15001 China Macao Special Administrative Region of China PAMI Research Group University of Macau 999078 China Anhui University Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Key Laboratory of Electromagnetic Environmental Sensing Hefei230601 China National Tsing Hua University Department of Electrical Engineering Institute of Communications Engineering Hsinchu Taiwan School of Data Science Shenzhen518172 China

Stable consumer electronic systems can assist traffic better. Good traffic consumer electronic systems require collaborative work between traffic algorithms and hardware. However, performance of popular traffic algorithms containing vehicle detection methods based on deep networks via learning data relation rather than learning differences in different lighting and occlusions is limited. In this paper, we present a dynamic Transformer network for vehicle detection (DTNet). DTNet utilizes a dynamic convolution to guide a deep network to dynamically generate weights to enhance adaptability of an obtained detector. Taking into relations of different information account, a mixed attention mechanism based channel attention and Transformer is exploited to strengthen relations of channels and pixels to extract more salient information for vehicle detection. To overcome the drawback of difference in an image account, a translation-variant convolution relies on spatial location information to refine obtained structural information for vehicle detection. Experimental results illustrate that our DTNet is competitive for vehicle detection. Code of the proposed DTNet can be obtained at https://***/hellloxiaotian/DTNet. © 2025 IEEE.

关键词： Dynamic convolution Hybrid Attention Mechanism Transformer Vehicle Detection

来源：评论

学校读者我要写书评

暂无评论

An image co-registration method for wide-swath and high-resolution spaceborne InSAR

An image co-registration method for wide-swath and high-reso...

引用

2009 Asia-Pacific Conference on Synthetic Aperture radar, APSAR 2009

作者： Wang, Ping Li, Zhenfang Suo, Zhiyong Liu, Yanyang National Key Laboratory of Science and Technology on Radar Signal Processing Xidian University Xi'an 710071 China

ISBN: (纸本)9781424427314

In this paper, we analyse the issue of SAR image co-registration for wide-swath and high-resolution spaceborne InSAR. A solution to this problem is proposed in which three processing procedures are adopted. First, image co-registration pre-processing is performed. There are two methods for this step: one is based on InSAR orbit and radar system parameters, and the other is based on the cross-correlation information of the master and the slave image. Second, coarse co-registration is implemented by block processing. Finally, fine co-registration is executed in order to obtain sub-pixel co-registration accuracy. Data simulation and qualitative analysis of coherence show that this method can provide accurate co-registration for wide-swath and high-resolution spaceborne InSAR, and meet the practical engineering requirement. ©2009 IEEE.

关键词： Synthetic aperture radar

来源：评论

学校读者我要写书评

暂无评论

Mutual coupling calibration and remedy method for polarization sensitive sensors

引用

Journal of Information and Computational science 2014年第3期11卷 765-772页

作者： Wang, Lanmei Wang, Guibao Chen, Zhihai School of Science Xidian University Xi'an 710071 China National Laboratory of Radar Signal Processing Xidian University Xi'an 710071 China

A mutual coupling calibration algorithm for polarization sensitive sensors is proposed in this paper. By introducing into an auxiliary element and using a calibration source with unknown parameters, the mutual coupling is calibrated. A mathematic model for mutual coupling across the six collocated antennas of a polarization sensitive sensor is established. And the solution of mutual coupling matrix was transformed into the solution of several matrix elements. The simulation results demonstrate this approach is effective. © 2014 by Binary Information Press.

关键词： Antenna arrays

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：