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A novel method of modeling the electromagnetic spectrum management system for the fleet

A novel method of modeling the electromagnetic spectrum mana...

2007 IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications, MAPE 2007

作者： Yu, Jing Liao, Rongtao Wen, Dinge National Key Laboratory of EMC China Ship Development and Design Center Wuhan 430064 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)1424410444

A dynamic distributed ship electromagnetic spectrum management system model based on multi-agent system (MAS) was presented in this article. The proposed system model was comprised of five kinds of agent: Data-Collector agent, Device-Operator agent, Analyze -Expert agent, Decision-Maker agent and Require/Command agent. Through the cooperation of agents, the system could solve spectrum apportionment for the formation of ships automatically. A we 11-organized central-plan with hierarchical management architecture was implemented by grading the agents into flagship and the other ships' decision-maker agents groups. It satisfies the distributed and dynamic requirement of ship formation in combined operation. © 2007 IEEE.

关键词： Ships

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A Novel Method of Modeling the Electromagnetic Spectrum Management system for the Fleet

A Novel Method of Modeling the Electromagnetic Spectrum Mana...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Yu Jing Liao Rongtao Wen Dinge China Ship Development and Design Center National Key Laboratory of EMC Wuhan China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

A dynamic distributed ship electromagnetic spectrum management system model based on multi-agent system (MAS) was presented in this article. The proposed system model was comprised of five kinds of agent: data-collector agent, device-operator agent, analyze-expert agent, decision-maker agent and require/command agent. Through the cooperation of agents, the system could solve spectrum apportionment for the formation of ships automatically. A well-organized central-plan with hierarchical management architecture was implemented by grading the agents into flagship and the other ships' decision-maker agents groups. It satisfies the distributed and dynamic requirement of ship formation in combined operation.

关键词： Electromagnetic modeling Electromagnetic spectrum Marine vehicles Radio spectrum management Microwave technology Interference Frequency Electromagnetic compatibility Wireless communication technology management

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Text digital watermarking technology based on graph theory

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2007年第10期44卷 1757-1764页

作者： Liu, Dong Sun, Ming Zhou, Mingtian School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610051 China National Key Laboratory of Reactor System Design Technology Chengdu 610041 China

Because of text's properties, it's so difficult to find perfect algorithms of embedding watermark into text documents, when compared with other media. Nowadays, text watermarking technologies is far behind other multimedia watermarking technologies such as images, audios, etc. A novel text digital watermarking technology based on graph theory is presented in this paper. Through changing its topology structures of a character or string, different figures are schemed out, which represent the same semanteme. Then those figures are mapped on graphs of graph theory, and the graphs or their properties should be correctly encoded in order to denote different watermarking information. The mathematic models of embedding and detecting watermarking are also described, and the experimental methods of robustness and visual influence, as well as the relative results are given. Finally, general rules of removing attack on text watermarking system is proposed, and the attack-resisting capability and methods of this text digital watermarking is analyzed in detail. According to the experimentation and analysis, the text watermarking technology has the following advantages: great capacity of watermarking, strong robustness, little visual influence and quite good attack-resisting capability. With this technology, it is more convenient to embed watermark into characters for ideograph languages such as Chinese and Korean, while it is suitable for embedding watermark into strings for alphabetic languages such as English and French.

关键词： Digital watermarking

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Modeling and Nonlinearity Compensation of Power Amplifiers in OFDM systems

Modeling and Nonlinearity Compensation of Power Amplifiers i...

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International Conference on Control and Automation (ICCA)

作者： Yuanming Ding Akira Sano Liaoning Key Laboratory of Intelligent Information Processing University Key Laboratory of Information Sciences and Engineering Dalian University of Technology Liaoning China Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan

A query-based local inverse modeling approach is proposed to compensate nonlinear power amplifiers (PAs) in orthogonal frequency division multiplexing (OFDM) systems. The PA is represented by the three-box model with a Wiener-Hammerstein structure. The inverse model of the PA is constructed based on the local modeling techniques, which can work as a predistorter (compensator) of nonlinear PA. Furthermore, a new look-up table (LUT) for constructing a predistorter of PA is also given to simplify the query-based nonlinearity compensation scheme (predistortion scheme). The effectiveness of the proposed scheme is validated by numerical simulation for a 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems.

关键词： Power system modeling Power amplifiers OFDM Predistortion Inverse problems Table lookup Nonlinear distortion Nonlinear control systems High power amplifiers Computational complexity

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A New Method for RAID Consistency Initialization

A New Method for RAID Consistency Initialization

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International Conference on Networking, Architecture, and Storage (NAS)

作者： Zhihu Tan Changsheng Xie Jiguang Wan Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan Hubei China Wuhan National Laboratory of Optoelectronics Wuhan Hubei China

When RAID volume is newly created, the data in RAID is then initialized. The process formats the RAID volume to clear any previously data and initialize redundancy information. This paper investigates others' initialization methods, and proposes a new initialization method. It makes RAID initialization and I/O request processing parallel, and reduces initialization time efficiently. Testing results reveals a moderately successful performance improvement.

关键词： Laboratories Disk drives Detectors Costs Random access memory Data storage systems Educational technology Testing Process design Writing

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Development of core fuel management code system for WWER-type reactors

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Nuclear science and Techniques 2006年第5期17卷 308-313页

作者： XIA Bang-Yang WANG Tao XIE Zhong-Sheng National Key Laboratory for Reactor System Design Technology Chengdu 610041 China Shanghai Jiaotong University Shanghai 200030 China Xi＇an Jiaotong University Xi＇an 710049 China

In this article, a core fuel management program for hexagonal pressurized water type WWER reactors (CFMHEX) has been developed, which is based on advanced three-dimensional nodal method and integrated with thermal hydraulic code to realize the coupling of neutronics and thermal-hydraulics. In CFMHEX, all these feedback effects such as burnup, power distribution, moderator density, and control rod insertion are considered. The verifica- tion and validation of the code system have been examined through the IAEA WWER-1000-type Kalinin NPP benchmark problem. The numerical results are in good agreement with measurements and are close to those of other international institutes.

关键词：核反应堆压水堆燃料管理三维节点法

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Flux expansion nodal method for solving static and transient neutron diffusion equations, in hexagonal-z geometry

Flux expansion nodal method for solving static and transient...

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PHYSOR-2006 - American Nuclear Society's Topical Meeting on reactor Physics

作者： Bangyang, Xia Zhongsheng, Xie Chunyu, Xian Dong, Yao Department of Nuclear Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China National Key Laboratory of Reactor System Design Technology Chengdu Sichuan 610041 China

ISBN: (纸本)0894486977

An intranodal flux expansion nodal method (FENM) for solving static and transient neutron diffusion equations in hexagonal-z geometry has been developed, in which the flux distributions are expanded into a set of analytic basis functions and orthogonal second-order polynomials. In order to improve the nodal coupling relations, a new type of nodal boundary conditions is proposed, which requires the continuity of both the zero- and first-order moments of partial currents across the nodal surfaces. The numerical results for a series of benchmark problems demonstrate that FENM exhibits good accuracy and convergence.

关键词： Neutron scattering

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Research and design of china Integral reactor Plant innovative containment

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Hedongli Gongcheng/Nuclear Power Engineering 2006年第6期27卷 91-93+98页

作者： Qin, Zhong National Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China

china Integral reactor Plant (CIP) is a light water cooled, 300 MW power reactor under development by Chinese national key laboratory of reactor system design technology. CIP features an integral reactor vessel that contains the CRDM and major reactor coolant system components including reactor core, coolant pumps, once-through steam generators and pressurizer. This integral design approach eliminates the large coolant piping and large loss of coolant accident (LOCA), and thus provides with higher level of securities. This paper introduces the selection of CIP containment system, the design of containment, the determination of design pressure for containment and the calculation analysis of containment structure.

关键词： Pressurized water reactors

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An Adaptive Nonlinearity Compensation Scheme for OFDM Communication systems

An Adaptive Nonlinearity Compensation Scheme for OFDM Commun...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Yuanming Ding I. Nilkhamhang A. Sano Liaoning Key Laboratory of Intelligent Information Processing Dalian University Liaoning China Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan

An adaptive predistortion linearization is proposed to compensate for the nonlinear distortions induced by high power amplifiers (HPAs) in orthogonal frequency division multiplexing (OFDM) systems. By expressing the uncertain nonlinear input-output dynamics of HPA by a new simplified Volterra series model (VSM), a predistorter (i.e., compensator) is constructed based on identification of inverse system of the HPA. Once predistorter's parameters are obtained by RLS algorithm, when OFDM signals pass through the cascade system of the predistorter and the HPA, overall linearization from predistorter input to HPA output can be achieved even if HPA is uncertain. The effectiveness of the proposed predistortion method is validated by numerical simulation for 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems

关键词： OFDM Predistortion Adaptive systems Nonlinear distortion High power amplifiers Nonlinear dynamical systems Power system modeling Resonance light scattering Numerical simulation Quadrature amplitude modulation

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Topological dynamics characterization for layered satellite networks

Topological dynamics characterization for layered satellite ...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Junfeng Wang Yuemei Hu Hongxia Zhou Mingtian Zhou College of Computer Science and Engineering University of Electronic Science and Technology ChengDu China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy and Sciences Beijing China Chongqing Communication College Chongqing China

The highly topological dynamics characterize the most fundamental property of satellite networks contrary to the terrestrial networks. This manifest feature directs the researches on various aspects of satellite networks, including routing and switching architecture selection, routing protocol and reliable transmission control protocol design and enhancement, etc,. The paper quantifies the dynamical activates of layered satellite network topologies. The number and length of network snapshots of one-layered satellite constellations are formulated concisely. The snapshot distributions of typical multi-layered constellations are also evaluated. With this work, it compensates for the simplified topological assumptions in many satellite network related investigations. The thorough understanding of this basic feature not only provides for an accurate quantification of network behavior, but also guides constellation design for future satellite networks

关键词： Low earth orbit satellites Satellite broadcasting Satellite constellations Routing protocols Network topology Next generation networking Quality of service Laboratories Information systems Communication system software

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