检索结果-内蒙古大学图书馆

International Conference on system Simulation and Scientific Computing, ICSC

作者： Shuhua Zhu Mingbo Tong Jie Xu Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing China Structure department ChengDu Aircraft Design and Research Institute Chengdu China

A special adaptive shock strut of landing gear with double-cavity and double damping is studied in the paper. Its mathematical model and virtual prototype, which is established based on the software ADAMS, are described. The paper has emphatically studied the sensitivities of its different configurations and main parameters to the taxiing performance of landing gear. The analysis shows that all of the side orifice, variable orifice and the high pressure cavity can reduce the overload and stroke of the adaptive shock absorber. The results also show that adjusting the pressure of the double cavities can reduce more overload than adjusting these volumes. The results obtained in the paper have reference value for the landing gear design of the large aircraft.

关键词： Shock absorbers Gears Performance analysis Orifices Electric shock Damping Mathematical model Software prototyping Virtual prototyping Aircraft

来源：评论

学校读者我要写书评

暂无评论

An Automatic and Scalable Testing Tool for Workflow systems

An Automatic and Scalable Testing Tool for Workflow Systems

引用

International Conference on Grid and Pervasive Computing Workshops, GPC

作者： Lin Quan Xiaozhu Lin Jianmin Wang Key Laboratory for Information System Security Ministry of Education China School of Software Tsinghua University Beijing China Computer and Information Management Center Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China

Nowadays workflow systems are widely deployed around the world, especially within large international corporations. Thus the performance evaluation of these workflow systems becomes an important topic, especially in grid environment. We have developed an automatic and scalable testing tool to evaluate workflow systems. This tool is named Scalable Workflow system Evaluation Tool (SWEET). SWEET can automatically test against workflow systems according to a highly customizable process template specified by users. It can also provide multi-layer performance metrics related to response time, throughput and fairness. Further, it can adoptively determine the maximum concurrency of a workflow system under a desired average processing time, using control theory (PI Controller). In this paper, we will present the design and architecture of SWEET. We will also discuss the evaluation metrics and our implementation of such a framework. Finally, we will give detailed experimental results and analysis.

关键词： Automatic testing system testing Delay Concurrent computing Measurement Pervasive computing Software testing Software tools Laboratories Automatic control

来源：评论

学校读者我要写书评

暂无评论

Modified min-sum decoding algorithm for LDPC codes based on classified correction

Modified min-sum decoding algorithm for LDPC codes based on ...

引用

International Conference on Communications and Networking in china (chinaCOM)

作者： Zhou Zhong Yunzhou Li Xiang Chen Hanying Hu Jing Wang State Key Laboratory on Microwave and Digital Communications National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing China National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou China

In this paper, a modified min-sum decoding algorithm based on classified correction is proposed for low density parity check (LDPC) codes. Different from the single correction in the normalized belief propagation (BP)-based and offset BP-based algorithms [4], the proposed algorithm utilizes two corrections for both minimum and sub-minimum magnitudes of input messages in check nodes. These two correction factors can be obtained by analyzing the offset of updated messages in check nodes between the BP and the min-sum algorithms associated with check node degree. Simulation results show that the proposed algorithm can achieve performance very close to that of the BP algorithm. Furthermore, the FPGA implementation of this algorithm can reach a throughput of 200 Mbps at BER=10 -6 with lower complexity and fewer resources than the BP algorithm.

关键词： Parity check codes Iterative algorithms Approximation algorithms Iterative decoding AWGN Laboratories Microwave technology Belief propagation Algorithm design and analysis Field programmable gate arrays

来源：评论

学校读者我要写书评

暂无评论

Text digital watermarking technology based on graph theory

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Modeling and Nonlinearity Compensation of Power Amplifiers in OFDM systems

Modeling and Nonlinearity Compensation of Power Amplifiers i...

引用

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

来源：评论

学校读者我要写书评

暂无评论

A New Method for RAID Consistency Initialization

A New Method for RAID Consistency Initialization

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

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：