Wavelength Reusability of Failure Protection Based on Rerouting in Wavelength-routed Optical Networks

This paper investigates the wavelength efficiency of failure protection based on rerouting in wave-length-routed optical networks. In order to study the impacts of different traffic pattern over the efficiency, a parameter, wavelength reusability ρ, is introduced as an evaluation criterion. Performance of different failure protection methods and the imfluence of different muting schemes over the performance are investigated. The muting and wavelength assignment problem involved in failure protection is formulated as integer linear programming problem, relevant heuristic optimization algorithms are also developed, numerical results are presented and discussed in detail.     

高可用集群中TCP连接同步策略的研究

在分析比较了基于TCP连接的各种高可用方案中同步策略的基础上,提出了一种“混合式”的同步策略,该策略对输入流采用集中同步的方式,主服务器复制转发TCP连接建立过程中的初始序列号ISN给服务端的其他节点,来保证服务端所有节点与客户端成功进行三次握手并建立连接,对输入流采用集中同步简化了设置和实现的复杂度;对输出流采用后台同步的方式,该方式通过修改TCP协议栈的接收缓存来保存用于同步的必要信息,以保证输出流消息的后台一致性,提高了服务端在高负荷环境下的性能.     

通用搬运机器人的PLC控制系统的探讨

研究通用搬运机器上的PLC控制系统，并着重讨论PLC控制系统的设计与应用问题。     

分层部分样本轮换抽样下的混合估计

在实际抽样调查中，人们常采用部分样本轮换的方式进行抽样调查，然而，它的估计估计与精度如何，尚未见报导。本文试图对常用的分层抽样方式下的部分样本轮换抽样的估计及其精度问题作一探讨；     

Effects of Polyethylene Oxide Concentration on the Size of Beads in Electrospun Beaded Nanofibers

Embedding particle drugs in beaded nanofibers by electrospinning has been shown a potential approach to control drug release in tissue engineering. The bead size is one of the critical parameters in controlling the drug release rate. In this study,the relationship between polymer concentration and beads size was investigated. Aqueous polyethylene oxide（ PEO） solutions with different concentrations were prepared to obtain various beaded nanofibers by electrospnning. Optical microscope and scanning electron microscope（ SEM） were used to observe the variation tendency of bead size. With an increase in the polymer concentration,the diameter of fibers between beads became bigger,while the fiber uniformity improved. In addition, the polymer concentration influenced the distribution of bead diameter. Higher polymer concentration would reduce the possibility of small-sized beads formation and improve the uniformity of bead diameter. The study provides a possible way to control the size of beads,which is helpful for further research on the control of particle drug release.     

Anthropomorphic Classification of Tactile Qualities of Woven Fabrics Based on Skin/Textile Friction-Induced Vibrations

The common method classifying tactile qualities of fabrics is indirectly based on their difference of purely mechanical and physical properties. When human skin slides across fabric surfaces, the friction interaction between fabrics and skin will occur and trigger the cutaneouS tactile receptors, which are responsible for perceived tactile sensation. By the extracted features from friction- induced vibration signals, this paper presents an anthropomorphic classification method classifying tactile qualities of fabrics. The friction-induced vibration signals are recorded by a three-axis accelerator sensor, and the entice testing procedure is conducted in an anthropomorphic way to obtain vibration signals. The fast Fourier transform （FFT） is applied to analyzing the recoded signals, and then the classification features are extracted from the FFT data by the neurophysiological properties of tactile receptors. The extracted features are used to classify fabric samples by the softness sensation and the roughness sensation, respectively, and the classification performance is checked by a comparison with those in a sensory evaluation procedure. The results showed that the anthropomorphic objective classification method was precise and efficient to clarify tactile qualities of woven fabrics.     

不同光源条件下PVC涂层膜材料的光氧老化性能

以聚氯乙烯(PVC)涂层膜材料为研究对象,分别采用UVB313和UVA340型紫外灯管为光源进行人工加速老化试验,研究其光氧老化过程.对老化过程中试样的拉伸性能进行测试,并进行红外光谱和紫外光谱分析,以探究其光氧老化动力学过程.试验结果表明:两种光源条件下试样的光氧老化机制没有发生变化,但当累积紫外辐射能相同时,试样的老化程度并不一致,这是由两种光源的发光光谱不同造成的,因此,互易定律不适用于PVC涂层膜材料寿命预测模型的建立.根据两光源发光光谱的不同,引入有效紫外辐射的概念,依据改进的Schwarzschild定律建立了不同光源条件下PVC涂层膜材料老化结果的相关性.     

一种新的视频字幕提取算法(英文)

提出一种基于边缘强度的视频图像字幕提取算法。此算法通过对图像进行锐化预处理,使得对特定的视频序列可以达到较好的提取效果;通过领域平均处理,更好地分离了字幕区域和背景区域;提出一个基于投影统计特征分析的算法,能够更好、更高效、更精确地分离和提取字幕。实验证明,该算法在效果上优于其他的算法,并且该算法复杂度低,实用价值高,可以广泛用于视频编解码等过程中。     

经济型数控钻的改进设计

以Z4120为机械本体,X、Y轴加装十字滑台,Z轴采用行星减速步进,详细计算了各坐标轴的等效转动惯量,并通过多轴控制器实现经济型数控钻床的设计.     

L型结构的互质阵列二维波达方向估计

针对雷达L型均匀阵列因阵元间距太小导致无法在实际中摆放的问题,提出了一种L型互质阵列协方差重构二维波达方向(2D-DOA)估计算法。首先将L型互质阵列2D-DOA问题分解为两个子阵的1D-DOA问题,再根据互质阵列的位置,确定对应的虚拟均匀阵列,由于虚拟均匀阵列具有半正定(PSD)、低秩、托普利兹的结构特点,因而根据互质阵列接收数据的协方差矩阵,构造一个优化过程重构虚拟均匀阵列的协方差矩阵;然后利用MUSIC算法完成两个1D-DOA估计;最后利用配对算法对估计的一维角度进行配对。仿真实验表明,与L型均匀阵列MUSIC算法和L型互质阵列SS-MUSIC算法相比,在信噪比大于0dB、快拍数大于50的条件下,所提算法的方向角和俯仰角均方根误差最小,均低于0.8°,可分辨角度最小间距为5°,证明了所提算法在估计精度和分辨力方面的优越性。