检索结果-内蒙古大学图书馆

LPI radar signal detection based on radial integration of Choi-Williams time-frequency image

Journal of systems Engineering and Electronics 2015年第5期26卷 973-981页

作者： Yongjian Liu Peng Xiao Hongchao Wu Weihua Xiao Science and Technology on Complex Aviation Systems Simulation Laboratory Aviation University of Air Force

This paper mainly revolves the time-frequency image of low probability of intercept(LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Williams distribution(CWD) uses the exponential kernel of bilinear generalized class of time-frequency distribution, it has an excellent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio(SNR) condition. A radial integration method based on the integral rotating factor is proposed to detect LPI radar signals when the signals’ time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar signals’ time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additionally,the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.

关键词： low probability of intercept(LPI) integral rotating factor signal detection image processing

来源：评论

学校读者我要写书评

暂无评论

3D-Parallel Coordinates:Visualization for Time Varying Multidimensional Data

3D-Parallel Coordinates:Visualization for Time Varying Multi...

引用

2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Yao Zhonghua Wu Lingda Science and Technology on Complex Electronic System Simulation Laboratory Equipment Academy

Parallel coordinates can visualize multidimensional data efficiently,during to its shortage in displaying time-varying data,we present a new method to add time dimension,which can extend parallel coordinates into 3D space(3D-Parallel Coordinates)consisted of attribute,range and time *** that timevarying multidimensional data can be displayed as polygonal line cluster for recording and analyzing.A technique called clipping shade is taken to highlight datasets around the current time,and results reveal that 3D-Parallel Coordinates can effectively analyze attribute's time-varying character.

关键词： parallel coordinates time-varying multidimensional data data visualization

来源：评论

学校读者我要写书评

暂无评论

A Hierarchical Access Control Model of Software Repository Based on RBAC

A Hierarchical Access Control Model of Software Repository B...

引用

2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Cen Pengrui Wu LingDa Yang Chao Yu Ronghuan Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment

Analized the task and general form of the software management;pionted out the shortages of the software repository on *** introduced the Role-Based Access Control model(RBAC model) which was introduced into the construction of software repository service by combining with the requirement of security management about software repository.A hierarchical access control model based on RBAC was proposed,and it database of the software repository based on RBAC was *** effective application of this model in the process of software management can ensure the convenience of software distribution;and meanwhile it can effectively improve the security of the software packages.

关键词： software management access control model security

来源：评论

学校读者我要写书评

暂无评论

Network Boundary and Protection

Network Boundary and Protection

引用

International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Haitao Yang Jian Zhang Science and Technology on Complex Electronic System Simulation Laboratory Department of Graduate Management Equipment Academy Beijing China

ISBN: (纸本)9781509051557

The exposure of PRISM reminds us of network sovereignty. There are two problems about network sovereignty-network boundary partition and protection. These two problems are discussed in this paper. A method of multidimensional network boundary partition is proposed based on comprehensive analysis of existing schemes. And network boundary protection is studied based on standard rules of cyber warfare. Characteristic of network boundary protection technique is analyzed and methods are proposed about how to construct network boundary protection.

关键词： Law Switches Security Logic gates Servers Internet Ports (Computers)

来源：评论

学校读者我要写书评

暂无评论

A system-of-systems architecture-driven modeling method for combat system effectiveness simulation 2

A system-of-systems architecture-driven modeling method for ...

引用

2nd Annual IEEE International Symposium on systems Engineering, ISSE 2016

作者： Li, Xiaobo Wang, Weiping Shu, Zhe Zhu, Ning He, Hua Liao, Tianjun College of Information Systems and Management National University of Defense Technology Changsha Hunan410073 China Department of Mathematics and Computer Science University of Antwerp Antwerp2020 Belgium State Key Laboratory of Complex System Simulation Beijing Institute of Systems Engineering Beijing China

ISBN: (纸本)9781509007936

Under the background of system-of-systems (SoS) counterwork, it is more apparent that the simulation modeling of the equipment should be domain-specific, formal, automatic and composable. Current equipment effectiveness simulation modeling approaches are mainly based on the methods and techniques from the modeling and simulation (M&S) community and software engineering community, and they are not capable to satisfy these four requirements systematically. Thus the systems engineering architecture model and domain knowledge should be used to support effectiveness simulation modeling more effectively. In this research, we propose an architecture-driven modeling method which conforms to the principle of architecture-driven development, uses ontology techniques to build equipment SoS architecture model and sub-domain ontology. This method performs architecture driven simulation modeling to realize the transformation from architecture models to simulation model frameworks;employs ontological metamodeling to design domain-specific modeling languages (DSML) based on the comprehensive usage of architecture models, sub-domain ontologies and M&S formalisms;integrates domain-specific simulation models from various domains using the model framework, and supports the composable development of simulation applications. © 2016 IEEE.

关键词： system of systems

来源：评论

学校读者我要写书评

暂无评论

LPI radar signal detection based on radial integration of Choi-Williams time-frequency image

引用

Journal of systems science & complexity 2015年第5期28卷 973-981页

作者： Yongjian Liu Peng Xiao Hongchao Wu Weihua Xiao Science and Technology on Complex Aviation Systems Simulation Laboratory Aviation University of Air Force

This paper mainly revolves the time-frequency image of low probability of intercept(LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Williams distribution(CWD) uses the exponential kernel of bilinear generalized class of time-frequency distribution, it has an excellent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio(SNR) condition. A radial integration method based on the integral rotating factor is proposed to detect LPI radar signals when the signals' time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar signals' time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additionally,the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.

关键词： low probability of intercept （LPI） integral rotating fac-tor signal detection image processing

来源：评论

学校读者我要写书评

暂无评论

The Evaluation Method of Equipment system of systems Based on Big Data Analysis

The Evaluation Method of Equipment System of Systems Based o...

引用

2015 International Conference on Automation,Mechanical Control and Computational Engineering(AMCCE 2015)

作者： Liu Dong Li Kang Science and Technology on Complex Electronic System Simulation Laboratory

ISBN: (纸本)9781510803084

In the evaluation of equipment system of systems(So S), equipment data has shown some new characters, such as big volume, wide range sources, and dynamic variance. The paper pointed out the idea to evaluate equipment So S based on big data analysis techniques. The outline of the method is provided from two points of view, namely the big data processing techniques and equipment So S evaluation methods. Based on big data, equipment So S efficiency evaluation, counter evaluation, and other deeper level applications, such as intelligence processing and situation analysis, can be made. The method is a new method in the equipment So S evaluation field.

关键词： equipment system of systems efficiency evaluation data analysis

来源：评论

学校读者我要写书评

暂无评论

The view growth pattern of user generated videos on YouTube

引用

International Journal of u- and e- Service, science and technology 2016年第6期9卷 433-444页

作者： Zhou, Renjie Xia, Dongchen Yin, Yuyu Zhang, Jilin Zhang, Wei College of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory Complex System Modeling and Simulation Ministry of Education Hangzhou China

With the rapid development of social media, video sharing sites like YouTube are getting more and more attention. Discovering the view growth pattern have become interesting topics for researchers as well as advertisers, media companies. In this paper, we analyze two aspects about video view growth pattern of YouTube videos. Firstly, the pattern of aggregated view is studied. It is found that the aggregated view rate peaks in the first few days, and falls quickly in the following days, and then decrease slowly during the consecutive weeks. Finally, the view rate tends to be a constant on the long run. The aggregated view count after a period of two months can be fitted with a linear line. Secondly, the view growth pattern of individual video is explored. The results indicate that the majority of videos peak at the very beginning of videos’ lifetime, and the category of view sources causes the peak is different. The view count of individual video and the view count from each source item also stabilize after a period of two months, and we finally show the referring time and active period of each source item. © 2016 SERSC.

关键词： Growth rate

来源：评论

学校读者我要写书评

暂无评论

Geoacoustic characterization using vector ship noise field in a hard-bottom environment

Geoacoustic characterization using vector ship noise field i...

引用

OCEANS

作者： Qun-yan Ren Li Ma Shengming Guo Shengchun Piao Tianjun Liao Key Laboratory of Underwater Acoustics Environment Chinese Academy of Sciences Beijing Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University Harbin State Key Laboratory of Complex System Simulation Beijing Institute of System Engineering Beijing

ISBN: (纸本)9781509015276

This paper presents our preliminary geoacoustic inversion results of the ship noise data collected by a vector sensor in 2008, Dalian, China. For the at-sea measurement, a fishing boat was served as a passive source passed by the receiver boat deploying a vector sensor, which collected the pressure field and particle velocity components at three orthogonal directions of X, Y and Z. A batch inversion scheme is adapted to optimize a Bartlett type cost function that comprises the range-dependent sound propagation features. The results from the pressure, vertical particle velocity component and the combination of them are presented, which suggests the combination processing can provide better inversion results.

关键词： Marine vehicles Oceans Geoacoustic inversion Sediments Underwater acoustics

来源：评论

学校读者我要写书评

暂无评论

Feature-oriented striation processing of the noise field due to a moving ship

Feature-oriented striation processing of the noise field due...

引用

OCEANS

ISBN: (纸本)9781509015276

The regular striations exhibited in broadband noise spectrogram due to a moving ship have been exploited for inverse problems in underwater acoustics, e.g., sediment geoacoustic characterization and source ranging. The enhancement of the underlying interference structure for striation extraction has been a hot topic for relative applications. In this paper, a straightforward method based on the low-frequency sound propagation characteristics is proposed to strengthen the main striation features. This method intuitively enhances the striation pattern by smoothing the resultant spectrogram along range (time) for each frequency bin. The method is applied to the ship noise data collected in 2008, Dalian, and then filtered by a multi-scale line filter, which demonstrate can greatly improve the quality of extracted striations than that of raw data. A hough transformation technique is applied to reconstruct the striation segment to estimate precise geometrical information that can be used for source range estimation.

关键词： Marine vehicles Spectrogram Time-frequency analysis Sediments Distance measurement Underwater acoustics

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：