多台并行随机CIMS可靠性的扩散估计界

ＣＩＭＳ可靠性模型随机研究的突出特点是工作站的并行结构使系统的状态个数呈现指数级增大，同时，并行结构与有限的缓冲库相互交织在一起，这使系统状态呈爆炸趋势，显然，对系统作精确的分析与系统呈现的状态爆炸趋势构成了难以解决的矛盾，如何解决这一矛盾正是ＣＩＭＳ随机理论有待开发的重要课题。我们把扩散近似方法引入到多台并行的ＣＩＭＳ可靠性模型中，以简单的连续过程描述了具有状态爆炸趋势的复杂离散过程，给出了ＣＩ     

光接入网中DWMT调制技术的研究

研究了光纤－电缆调制解调器接入技术的上行信道调制方式，分析了离散小波多音（DWMT）调制与其它调制方式相比所具有的特点和优势，提出了DWMT调制解调器的实现模型，设计了使用DWMT调制解调器的光纤－电缆调制解调器双向传输的系统方案；并对DWMT调制的系统特性进行了计算机仿真分析。仿真结果表明，DWMT调制是一项能有效实用于光纤－电缆调制解调器系统上行信道的技术。     

框架剪力墙结构工程主体施工

要保证高层建筑的施工质量、技术要求、加快施工速度 ,关键是要解决好高层施工中的模板、钢筋、脚手架搭设以及轴线的竖向传递等几项技术 ,通过工程实践对这几项施工技术进行了总结 ,该技术既满足了施工高层建筑的要求 ,又取得了降低工程成本的效果。     

Thermal and mechanical properties of EPR and XLPE cable compounds

This paper shows that the mechanical and thermal properties of EPR cable dielectrics are very stable with temperature. Commercially available EPR and TRXLPE cable dielectrics typically have about the same thermal conductivity, although the thermal conductivity of TRXLPE above the melting point of the crystallites drops below that of the EPR dielectrics. The mechanical properties of EPR cable dielectrics are much more stable with temperature than those of the TRXLPE, as EPR polymer is essentially amorphous so that EPR cable dielectrics do not suffer from the very large thermal expansion of TRXLPE as its crystallites melt.     

复射线展开法分析圆柱面对平面波散射的精度问题

讨论了用复射线展开法计算圆柱面对入射平面波散射时的计算误差特性，提出了控制其计算精度的复射线展开参数选择方法，证实了通过恰当选择展开参数可以有效地提升计算精度、实现误差控制。     

Integrating heterogeneous distributed COTS discrete-event simulation packages: an emerging standards-based approach

This paper reports on the progress made toward the emergence of standards to support the integration of heterogeneous discrete-event simulations (DESs) created in specialist support tools called commercial-off-the-shelf (COTS) discrete-event simulation packages (CSPs). The general standard for heterogeneous integration in this area has been developed from research in distributed simulation and is the IEEE 1516 standard The High Level Architecture (HLA). However, the specific needs of heterogeneous CSP integration require that the HLA is augmented by additional complementary standards. These are the suite of CSP interoperability (CSPI) standards being developed under the Simulation Interoperability Standards Organization (SISO-http://www.sisostds.org) by the CSPI Product Development Group (CSPI-PDG). The suite consists of several interoperability reference models (IRMs) that outline different integration needs of CSPI, interoperability frameworks (IFs) that define the HLA-based solution to each IRM, appropriate data exchange representations to specify the data exchanged in an IF, and benchmarks termed CSP emulators (CSPEs). This paper contributes to the development of the Type I IF that is intended to represent the HLA-based solution to the problem outlined by the Type I IRM (asynchronous entity passing) by developing the entity transfer specification (ETS) data exchange representation. The use of the ETS in an illustrative case study implemented using a prototype CSPE is shown. This case study also allows us to highlight the importance of event granularity and lookahead in the performance and development of the Type I IF, and to discuss possible methods to automate the capture of appropriate values of lookahead.     

一种基于TDA16846的新型有源功率校正电路设计

介绍一种由集成电路芯片TDA16846完成的利用电荷泵(Charge Pump)实现的有源功率因数校正(APFC)技术。这种APFC电路的突出优点就是结构简单,通过对常规缓冲电路进行合理调整,可以很容易变成具有PFC功能的高性能开关电源。分析了APFC的工作原理,应用专用芯片TDA16846设计了电路图,并阐述了主要元件的功能。经实验证明,推荐电路设计合理,应用前景广阔。     

SAR图像组合分割算法

由于存在乘性斑点噪声的影响,给SAR图像分割造成很大困难,本文研究利用最大似然区域增长分割算法,提出区域增长前引入自适应边缘检测,图像分割性能获得较大提高.介绍了我们研究的分割性能优异的模拟退火分割算法,提出了分割性能接近模拟退火并且在SAR图像分割中比较实用的模拟退火和最大似然混合分割算法,并给出了这些分割算法的分割性能比较,以及在实际分割SAR图像时应当如何选择分割算法.     

cdma 1x终端测试

本文主要介绍了目前行业内对cdma 1x终端的测试要求.     

非线性编辑实验室的构建与实验教学

以计算机为操作平台的非线性编辑系统广泛应用于电视节目的制作 ,学校相关专业开设非线性编辑课程也需要配置非线性编辑系统作为学生实验用机。主要介绍一种学生实验用非线性编辑系统及实验室的配置方案以及该非线性编辑系统在实验教学中的性能特征。