偏振态脉冲激光辐射的微孔加工

文中讨论了偏振态脉冲激光辐射微孔加工的一些实验。首次发现了偏振态激光打孔具有的独特优势一良好圆度、边缘光洁整体和较高的重复性;分析了其原因,同时对偏振态脉冲激光辐射影响微孔质量（孔形、孔深、锥度、人口孔径）的一些因素,如泵浦能量、光阑的选择及其大小,光学系统的焦距等也作了较为详细的研究和测试,得到了具有参考价值的结果。     

啁啾光脉冲在自作用形成的时间波导中传播

将光脉冲在克尔介质中自作用产生的折射率变化作二阶近似,求解所得到的传播方程,得到啁啾高斯脉冲幅度,脉冲宽度和周啾参数随传播距离变化的严格解析解,讨论了基模高斯脉冲孤波传播的条件.     

激光在浊度测量中的应用

讨论了悬浮颗粒的光学散射特性,以及利用激光的高亮度、高准直性和很好的单色性对浊度进行测量的可行性。并且介绍了在国内电力行业很有影响,具有国内领先技术水平的JZ-Ⅳ型激光测浊仪。     

30路CCD多路传输器的研制

介绍了３０ 路 Ｃ Ｃ Ｄ 多路传输器 （ Ｃ Ｃ Ｄ Ｍ Ｕ Ｘ） 的设计、制造以及参数测量结果。     

用低价型DSP实现MP3解码

首先介绍了ＭＰＥＧ－２音频ｌａｙｅｒⅢ（ＭＰ３）的解码算法,叙述进行定点Ｃ语言仿真的技巧。基于ＴＩ公司的‘Ｃ５４９ ＤＳＰ芯片进行汇编工作,在ＴＭＳ３２０Ｃ５４９ ＥＶＭ板上实现了网上ＭＰ３文件的连续播放,效果满意。经过对算法和程序的优化使所需的运算量和存储空间都很低,使能在ＴＩ公司的低价型’Ｃ５４０２ ＤＳＰ上实现。     

基于多波束系统的多目标高分辨定向新方法

本文提出一种高分辨方位估计新方法－波束最佳匹配法。利用波束输出来实现高分辨定向。该算法不受信号相干性影响,在估计角度的同时可获得对应方向的能量。该算法可作为多波束系统的一个附加模块和后继处理,不影响原系统的结构关系,估计出的结果可以与多波束系统的判决结果相互参考。仿真表明,这种方法具有较高的稳健性、较好的高分辨定向能力能力和应用前景。     

智能网中的SCP过载控制研究

本文首先对Ｃａｌｌａｇｐ、Ｐｅｒｃｅｎｔ和漏梭算法进行了比较,得出了漏桶算法健壮性强适用于ＳＳＰ限制呼叫的结论。通过对过载控制框架的描述,提出了一种基于动态调整的控制算法用于ＳＣＰ过载控制。最后将算法进行扩展,使其满足不同的公平性条件,并适合在多业务环境各执行。模拟结果表明此算法具有较好的有效好性和公平性。     

Performance comparison of battery power consumption in wireless multiple access protocols

Energy efficiency is an important issue in mobile wireless networks since the battery life of mobile terminals is limited. Conservation of battery power has been addressed using many techniques such as variable speed CPUs, flash memory, disk spindowns, and so on. We believe that energy conservation should be an important factor in the design of networking protocols for mobile wireless networks. In particular, this paper addresses energy efficiency in medium access control (MAC) protocols for wireless networks. The paper develops a framework to study the energy consumption of a MAC protocol from the transceiver usage perspective. This framework is then applied to compare the performance of a set of protocols that includes IEEE 802.11, ECMAC, PRMA, MDRTDMA, and DQRUMA*. The performance metrics considered are transmitter and receiver usage times for packet transmission and reception. The time estimates are then combined with power ratings for a Proxim RangeLAN2 radio card to obtain an estimate of the energy consumed for MAC related activities. The analysis here shows that protocols that aim to reduce the number of contentions perform better from an energy consumption perspective. The receiver usage time, however, tends to be higher for protocols that require the mobile to sense the medium before attempting transmission. The paper also provides a set of principles that could be applied when designing access protocols for wireless networks.*ECMAC: energyconserving MAC. PRMA: packet reservation multiple access. MDRTDMA: multiservices dynamic reservation TDMA. DQRUMA: distributedqueuing request update multiple access.     

Tri-state median filter for image denoising

A novel nonlinear filter, called tri-state median (TSM) filter, is proposed for preserving image details while effectively suppressing impulse noise. We incorporate the standard median (SM) filter and the center weighted median (CWM) filter into a noise detection framework to determine whether a pixel is corrupted, before applying filtering unconditionally. Extensive simulation results demonstrate that the proposed filter consistently outperforms other median filters by balancing the tradeoff between noise reduction and detail preservation.     

Weight hierarchies of extremal non-chain binary codes of dimension4

The weight hierarchy of a linear [n,k;q] code C over GF(q) is the sequence (d₁,d₂,···,d_k ) where d_r is the smallest support of an r-dimensional subcode of C. An [n,k;q] code is extremal nonchain if, for any r and s, where 1⩽rS(D)=d_r, and w_S (E)=d_s. The possible weight hierarchies of such binary codes of dimension 4 are determined