日像仪干涉阵结构优化的加速压力算法     

王书振  颜毅华  寿建军  徐国华 《中国科学院研究生院学报》2005,22(4):416-421

提出的加速压力算法是对Boone压力算法在解的质量和收敛速度两方面的改进,通过一次移动天线阵,可以完全消除阵元数目个uv采样点处的残差,使得每次迭代的uv分布修正量最大,从而不仅达到减小计算量的目的,而且使优化结果更加逼近理想模型.通过ALMA阵结构的优化与原有算法做了对比,验证了算法的有效性和高效性.最后,给出了中国国家天文台正在建设的日像仪干涉阵结构的仿真结果  相似文献   

Phase locking dynamics in 2D Josephson junction arrays with external load     

B. FrankW. Krech 《Journal of The Franklin Institute》2002,339(1):1-12

Phase locking in a basic two-dimensional hybrid Josephson junction array consisting of two rows and four columns shunted by an external load is investigated, exploiting an approximation combining the ideas of harmonic balance with that of the slowly varying phase procedure. Using small ring inductances, the junction voltages within the same row oscillate nearly in-phase unless the external magnetic flux in the loops is near a multiple of a quarter of the flux quantum. Without external load we have found a stable antiphase regime where both rows carry out uniform interferometer oscillations. A stable in-phase regime, favored in an optimized radiation source, can be reached by means of an external inductive shunt for small external fields only.  相似文献   

基于MEMS技术的三维触觉感知阵列研究     

王辉静 《深圳信息职业技术学院学报》2008,6(2):59-62

本文设计了一种基于MEMS技术的柔性触觉感知阵列。通过将MEMS传感器单元与柔性基板相结合,实现三维曲面上的分布力的测量。该触觉感知阵列适台安装于智能机器人手爪上,为机器人系统高效率地获取物体形状、位置和姿态信息、实现智能操作物体提供了有效的手段。  相似文献   

阵列天线单元失效的递推最小二乘算法应用     

杜夔 《淮北职业技术学院学报》2008,7(3)

阵列天线在部分收发单元失效时,其收发波瓣会有不同程度的恶化。采用基于递推最小二乘的自适应波束形成算法可以初步解决这个问题。  相似文献   

网络实验室管理系统的开发与实现   总被引：4，自引：1，他引：3  

王强  李战春  刘晓春 《实验室研究与探索》2008,27(11)

结合网络实验室实验教学的特点,阐述了开发网络实验室管理系统的设计思路、功能及技术特点,提出了网络实验逻辑机架的划分、远程网络教学实验及网络实验设备与实验终端(计算机)的绑定等新思路,并将其应用于管理系统中,成功地实现了网络实验从实验预约、实验过程到实验完毕后对实验设备的处理等方面的全智能化管理,提升了网络实验管理水平,减少人工干预,同时充分开放实验资源,提高了设备利用率。  相似文献   

对C语言中指针的探讨     

梁凤兰 《和田师范专科学校学报》2006,26(5):169-170

指针是C语言的一个难点。文中在分析了C语言中指针的定义、指针与简单变量的关系、指针与数组的关系、指针与函数的关系、指针与文件等知识的基础上,探讨了对C语言中指针的理解方法。  相似文献   

Compact wideband microstrip array antenna with beam squint     

杜成珠  钟顺时  孙竹 《上海大学学报(英文版)》2011,15(2):154-156

A compact wideband microstrip array antenna with a squint beam is introduced without the matched load. Its measured beam is at 10° offset to the broadside with a measured gain of 12 dB at 10 GHz. The measured impedance bandwidth (voltage standing wave ratio (VSWR)⩽2) is over 16%, which agrees well with the simulated one. It is a low-cost wideband design with compact simple structure, suited for military and commercial application.  相似文献   

Extending and analysis of X-Code     

金超  冯丹  刘景宁 《上海大学学报(英文版)》2011,15(3):194-200

X-Code is one of the most important redundant array of independent disk (RAID)-6 codes which are capable of tolerating double disk failures. However, the code length of X-Code is restricted to be a prime number, and such code length restriction of X-Code limits its usage in the real storage systems. Moreover, as a vertical RAID-6 code, X-Code can not be extended easily to an arbitrary code length like horizontal RAID-6 codes. In this paper, a novel and efficient code shortening algorithm for X-Code is propo...  相似文献   

Principle and architecture of parallel reconfiguration circuit for ternary optical computer     

欧阳山  金翊  周裕  王宏健 《上海大学学报(英文版)》2011,15(5):397-404

Reconfiguration is the key to produce an applicable ternary optical computer (TOC). The method to implement the reconfiguration function determines whether a TOC can step into applied fields or not. In this work, a design of the reconfiguration circuit based on field programmable gates array (FPGA) is proposed, and the structure of the entire hardware system is discussed.  相似文献   

关联规则挖掘在超市销售系统中的应用及实现     

黄宏本  卢雪燕 《梧州学院学报》2011,21(3):59-63

超市购物篮分析是关联规则挖掘的典型应用领域,分析了关联规则在超市销售系统中的应用,然后提出了一种基于二维数组的关联规则挖掘实现算法,并根据算法开发实现了挖掘系统。通过模拟的超市销售数据进行试验表明,算法及所实现的系统是可行的、高效的。  相似文献