检索结果-南通市图书馆

Computer Aided Drafting,Design and Manufacturing 2001年第1期11卷 41-47页

作者： Xiong Hanwei①② Zhang Xiangwei② ①AI institute of Zhejiang University, hangzhou 3.002.,{2. ②Mechanic & electronic department of Shantou University, Shanton 515063.{2.) AI institute of Zhejiang University Hangzhou 310027 China Mechanic & electronic department of Shantou University Shanton 515063 China Mechanic & electronic department of Shantou University Shanton 515063 China

Visual method is now broadly used in reverse engineering for 3. reconstruction. The traditional computer vision methods are feature-based, i.e., they require that the objects must reveal features owing to geometry or textures. For textureless free-form surfaces, dense feature points are added artificially. In this paper, a new method is put forward combining computer vision with CAGD. The surface is subdivided into N-side Gregory patches using marked curves, and a stereo algorithm is used to reconstruct the curves. Then, the cross boundary tangent vector is computed through reflectance analysis. At last, the whole surface can be reconstructed by jointing these patches with 1Gcontinuity.

关键词： Reverse engineering Free-form surface design Computer vision

Narrowband imaging method for spatial precession cone-shaped targets

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第4期53卷 942-949页

作者： DING XiaoFeng1,FAN MeiMei1,WEI XiZhang1,LI Xiang1 & Xiao HuaiTie2.1 institute of Space electronics Information Technology,National University of Defense Technology,Changsha 410073.{2. 2.School of electronic Science and Engineering,National University of Defense Technology,Changsha 410073.{2. 1. institute of Space electronics Information Technology National University of Defense Technology Changsha 410073 China2. School of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

The imaging method of the mid-course missile is the key technique of the missile defense *** of the special precession character of the ballistic missile warhead,the inverse synthetic aperture radar method cannot realize phase compensation with the constant phase offset function,which leads to blurring of the *** this paper,we propose a new narrowband radar imaging method for the precession cone-shaped *** method acquires the Doppler modulation of the precession target's scattering centers with high resolution time-frequency analysis method and extracts the Doppler parameter from the result of the time-frequency analysis with the general Radon transform,then reconstructs the scattering centers positions in the parameter *** experiment results with the anechoic chamber data of the representative cone-shaped object showed the effectiveness of the method.

关键词： narrowband radar imaging time-frequency analysis general Radon transform

Improved FOCUSS method for reconstruction of cluster structured sparse signals in radar imaging

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2012年第8期55卷 1776-1788页

作者： HU ChenXi1,2.LIU YiMin1,LI Gang1&WANG XiQin1 1I ntelligent Sensing Laboratory,department of electronic Engineering,Tsinghua University,Beijing 100084,{2. 2. i'an electronic Engineering Research institute,Xi'an 710100,{2. 1. Intelligent Sensing Laboratory Department of Electronic Engineering Tsinghua University Beijing 100084 China2. Xi’an Electronic Engineering Research Institute Xi’an 710100 China

The high resolution imaging of distributed targets in millimeter-wave radar system is studied in this *** use Gaussian Mrakov random field(GMRF)to represent the clustering property of the *** novel method,called Clustering FOCUSS,incorporate an additional cluster constraint into the process of the focal underdetermined system solver(FOCUSS)*** results indicate that the novel algorithm has a higher imaging accuracy than the methods of Capon beamforming,the l1 norm algorithm and the FOCUSS algorithm.

关键词： antenna array high resolution imaging cluster sparsity GMRF Clustering FOCUSS

Control of Multi-Agent Formation with Optimally Persistent Graph

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Control of Multi-Agent Formation with Optimally Persistent G...

Introduction to Ant Colony Algorithm and Its Application in CIMS

第2.届中国控制与决策会议

作者： Shikai Shao 1 , Xiaoyuan Luo 1 , Tao Jin 2., Xinping Guan 1,3.1. institute of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, china 2. College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, china 3. School of electronic and Electric Engineering, Shanghai Jiangtong University, Shanghai, 2.02.0, china

In this paper, a distributed control law for optimally persistent formation of leader-follower multi-agent systems is presented. According to the characteristic of optimally persistent formation, each follower, except the one which follows the leader, can only communicate with its two precedent neighbors. Based on the state information received from neighbors, a scalable gradient-like control law is designed to control the motion of the formation. Through using this control law, any three agents that are not in a line can achieve a stable triangular persistent formation. Extend this implementation to the whole formation, thus each agent will keep desired distance constraints to its two precedent neighbors. Finally, simulation examples are illustrated to show the efficiency of the proposed control law.

关键词： Persistent formation Multi-agent systems Rigid graph Leader-follower

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

厦门大学学报（自然科学版） 2002年第S1期41卷 182-页

作者： WANG Jian, WANG Yue-sheng, ZHOU Ya-jun (department of Automation, hangzhou {2. of {3. and Engin eering, hangzhou 3.003., china)

Ant colony algorithm is a novel simulated ecosystem e volutionary algorithm, which is proposed firstly by Italian scholars ***, A . Colormi and V. Maniezzo. Enlightened by the process of ants searching for food , scholars bring forward this new evolutionary algorithm. This algorithm has sev eral characteristics such as positive feedback, distributed computing and stro nger robustness. Positive feedback and distributed computing make it easier to find better solutions. Based on these characteristics, this algorithm provides a possible way for complicated combinatorial optimization problems, especially i n the field of discrete system. After a brief review on the essential principle, the research state of ant colony algorithm, this paper especially discusses the application of ant colony algorithm in CIMS.

关键词： ant colony algorithm CIMS combinatorial optimiz ation

在线全文

学校读者我要写书评

暂无评论

一种新的扩散混合机制

通信学报 2002年第1期23卷 52-59页

作者：陈勤叶又新杭州电子工业学院计算机科学与技术系浙江杭州310037

本文针对扩散混合新机制扩压函数,提出了它的基本设计原则。引入了级连布尔函数的概念,给出并证明了它的一些性质,在此基础上提出了单比特扩压函数的一种构造方法,并给出了一个具体的具有良好密码学性能且结构简单易于软硬件实现的单比... 详细信息

本文针对扩散混合新机制扩压函数,提出了它的基本设计原则。引入了级连布尔函数的概念,给出并证明了它的一些性质,在此基础上提出了单比特扩压函数的一种构造方法,并给出了一个具体的具有良好密码学性能且结构简单易于软硬件实现的单比特扩压函数实例。

关键词：分组密码布尔函数单比特扩压函数级连布尔函数扩散混合机制密码

光束控制系统热效应与球差对激光光束质量的影响

在线全文

学校读者我要写书评

暂无评论

物理学报 2004年第3期53卷 952-960页

作者：季小玲陶向阳吕百达四川大学激光物理与化学研究所

采用Strehl比、桶中功率、β参数和束宽描述远场光束质量 ,研究了光束控制系统热效应和球差对远场激光光束质量的影响 .用四维仿真程序作了详细计算 ,给出了数值计算结果并进行了物理分析 .研究表明 ,传输通道的热效应和正球差会使远场... 详细信息

采用Strehl比、桶中功率、β参数和束宽描述远场光束质量 ,研究了光束控制系统热效应和球差对远场激光光束质量的影响 .用四维仿真程序作了详细计算 ,给出了数值计算结果并进行了物理分析 .研究表明 ,传输通道的热效应和正球差会使远场光强分布扩展 ,可聚焦能力下降 ,光束质量变差 .有意义的是 ,当激光发射功率达到一定值时 ,合适选取负球差会在几何焦面得到比无球差时更高的峰值光强和更好的可聚焦能力 .但在以前的工作中 ,由于焦移 ,类似的结论是在实际焦面上得出的 .非线性热晕的存在是其物理原因。

关键词：光束控制系统热效应球差高功率激光桶中功率高功率激光光强分布光束质量

BIOLOGIC PHYSICS CHARACTER OF RADIO-FREQUENCY AND ITS APPLICATION ON TUMOUR THERAPY

在线全文

学校读者我要写书评

暂无评论

BIOLOGIC PHYSICS CHARACTER OF RADIO-FREQUENCY AND ITS APPLIC...

GdFeCo/DyFeCo交换耦合两层薄膜磁化方向转变的研究

第四届国际微波与毫米波技术会议

作者： ZHOU Runjing~1 JIA Lanping~1 DU Yu~1 WANG Tao~2.LIANG Zhian~3.(1.department of Automation College of Sciences and Technology NeiMongol University Huhhot china 01002. 2. Inner Mongolia Medical College Inner Mongolia Hohhot china 3. Shanghai Finance and Economics University department of Application mathematics Shanghai china)

＜正＞In this paper, based on the biologic physics characters of radio-frequency, we design a hyperthermia instrument, which uses FPGA to serve as controller and signal generator, utilizes three-electrode capacitive RF hyperthermia to adjust heating field distribution, and realizes multipoint temperature measure by a decaying fluorescence type fiber optical sensor. The therapy result on brain glioma is presented also.

关键词： capacitive RF hyperthermia fiber optic thermometer FPGA fuzzy control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

物理学报 2004年第2期53卷 614-619页

作者：张约品王现英林更琪李震李佐宜沈德芳干福熹中国科学院上海光学精密机械研究所华中科技大学电子科学与技术系武汉430074

用磁控溅射法制备了GdFeCo DyFeCo交换耦合两层薄膜 ,对交换耦合两层薄膜变温磁化方向进行了研究 .结果表明读出层GdFeCo随温度上升从平面磁化转变成垂直磁化 ,转变过程中主要受饱和磁矩 (Ms)的影响 .在GdFeCo的补偿温度附近 ,读出层的... 详细信息

用磁控溅射法制备了GdFeCo DyFeCo交换耦合两层薄膜 ,对交换耦合两层薄膜变温磁化方向进行了研究 .结果表明读出层GdFeCo随温度上升从平面磁化转变成垂直磁化 ,转变过程中主要受饱和磁矩 (Ms)的影响 .在GdFeCo的补偿温度附近 ,读出层的磁化强度近于零 ,退磁场能减小 ,并在交换耦合的作用下 ,使读出层的磁化方向发生转变。

关键词：磁光记录交换耦合两层薄膜磁化方向转变磁控溅射法饱和磁矩补偿温度磁化强度中心孔磁超分辨效应