Packing subgraphs in a graph

We show that the problem of packing edges and triangles in a graph in order to cover the maximum number of nodes can be solved in polynomial time. More generally we present results for the problem of packing edges and a family of hypomatchable subgraphs.     

双曲线型结点组上的插值

本文讨论了R~2上的弧线型结点组之一:双曲线型结点组上插值的适定性问题。     

基于FDLs的边缘汇聚节点的性能研究

随着全光接入网的不断发展,接入速率不断提高,对于边缘节点发送来的高速数据业务也必须进行流量梳理。为了适应未来全光高速网络接入的需求,基于光纤延迟线(Fiber delay lines,FDLs)结构,构造了一种简单高效的全光包交换网络边缘汇聚节点。并针对光线延迟线结构,提出一种新的主动缓存队列管理模型来分析节点性能,得到了与以往研究不同的结果。同时在对节点性能分析的基础上,提出一种新的FDLs的排列方式,在缓存深度相同的情况下,大大提高了FDLs的效率,实现了对到来的具有自相似性的数据业务的合理调配。     

奇异杂交边界点方法求解泊松方程

As a boundary-type meshless method,the singular hybrid boundary node method(SHBNM)is based on the modified variational principle and the moving least square(MLS)approximation,so it has the advantages of both boundary element method(BEM)and meshless method.In this paper,the dual reciprocity method(DRM)is combined with SHBNM to solve Poisson equation in which the solution is divided into particular solution and general solution.The general solution is achieved by means of SHBNM,and the particular solution is approximated by using the radial basis function(RBF).Only randomly distributed nodes on the bounding surface of the domain are required and it doesn't need extra equations to compute internal parameters in the domain.The postprocess is very simple.Numerical examples for the solution of Poisson equation show that high convergence rates and high accuracy with a small node number are achievable.     

A Bidirectional “Y” Type OXC Structure Using the Least Optical Switches

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基于CAN总线的光电信息采集传输系统设计

采用8位单片机87C51FA和新一代CAN控制器SJA1000,实现了航行器黑匣子中多路光电信息采集传输系统的设计,并洋细叙述了模块化的节点软硬件设计方案。     

Ranking important nodes in complex networks by simulated annealing

In this paper, based on simulated annealing a new method to rank important nodes in complex networks is presented.First, the concept of an importance sequence(IS) to describe the relative importance of nodes in complex networks is defined. Then, a measure used to evaluate the reasonability of an IS is designed. By comparing an IS and the measure of its reasonability to a state of complex networks and the energy of the state, respectively, the method finds the ground state of complex networks by simulated annealing. In other words, the method can construct a most reasonable IS. The results of experiments on real and artificial networks show that this ranking method not only is effective but also can be applied to different kinds of complex networks.     

用于正交各向异性织物仿真的弹簧质点模型

针对正交各向异性织物,本文提出了一种含附加节点的三角形弹簧质点模型．通过冗余自由度的引入和缩聚,能够实现有限元模型和弹簧质点模型三角形单元刚度矩阵的精确相等;据此,针对一般正交各向异性材料常数和单元形状,推导出弹簧质点模型中弹簧刚度系数及附加节点位置的解析表达式,有效解决了传统弹簧质点模型在正交各向异性织物仿真中存在的计算精度不高、弹簧参数选取随意等缺陷;并进一步完善了基于弹簧质点模型的柔性织物空间变形算法．数值模拟表明本文提出的弹簧质点模型和变形算法在进行织物仿真计算时,具有精度好、通用性强等优点．     

How size evaluation of lymph node is protocol dependent in MRI when using ultrasmall superparamagnetic iron oxide nanoparticles

In this study, the volume of susceptibility artifact was evaluated in T1 and T2-weighted spin echo (SE) and gradient echo (GRE) images at various parameters using registration and subtraction methods. In order to state an important misinterpretation problem in lymphography, it was demonstrated that a lymph node size may be enlarged approximately 10 times when a T2*-weighted GRE protocol is used. To overcome this problem a technical consideration using multisequence (GRE and SE) paradigm was suggested to ensure both lymph node detection and metastasis identification in lymphatic system. The paradigm was also extended by post-processing manipulation of the SE images using a registration and subtraction approach for detection of lymphatic lesions.     

微反射镜阵列动态增益均衡器动态响应优化及其平坦实验

在长距离骨干网和光节点中,多个掺铒光纤放大器(EDFA)级联造成纹波及在光节点进行波长上下载时,由于通道中信号光的功率改变从而使EDFA的增益曲线也会变化,由此产生的非线性提出了对增益进行动态均衡的要求,对通道光功率的动态均衡是非常必要的。介绍了一种基于微机电系统(MEMS)反射镜阵列的动态通道均衡器(DCE)。为了优化其动态特性,需要对敛动器进行建模并优化控制算法,通过数值分析和实验数据确定模型参数,并且仿真结果与实验符合。最后,进行了4通道的动态均衡实验,系统响应时间小于5ms,信号的超调量得到了改善,纹波可以控制在0．5dB以内。