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沈奇 《光纤与电缆及其应用技术》1996,(4):3-4
根据我国目前市场需求的分析,局用通信设备电缆将在今后相当一段时间内成为通信电缆开发的主要方向。本文对其使用场合,结构特点及材料选用作了扼要的介绍和比较。 相似文献
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针对移动数据业务流量的激增以及中国移动实现流量精细化经营的迫切需求,阐明了流量经营的三个关键措施,并从PCC架构以及综合网关(ISG)在PPC架构中的功能和定位出发,就ISG如何实现流量精细化运营展开了阐述,并对ISG在流量深度处理和增值方面进行了比较深入的探讨,从面向增值业务、面向用户使用和面向移动互联网三个方面说明了ISG能实现的业务增值能力。 相似文献
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文章从集团客户信息化项目的分析框架入手,就集团客户信息化项目需要重点关注的几个方面展开了详细的讨论,并对其中涉及的关键参数的作用及其取值作了描述。 相似文献
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Up to now, the wave union method can achieve the best timing performance in FPGA-based TDC designs. However, it should be guaranteed in such a structure that the non-thermometer code to binary code (NTH2B) encoding process should be finished within just one system clock cycle. So the implementation of the NTH2B encoder is quite challenging considering the high speed requirement. Besides, the high resolution wave union TDC also demands that the encoder convert an ultra-wide input code to a binary code. We present a fast improved fat tree encoder (IFTE) to fulfill such requirements, in which bubble error suppression is also integrated. With this encoder scheme, a wave union TDC with 7.7 ps RMS and 3.8 ps effective bin size was implemented in an FPGA from Xilinx Virtex 5 family. An encoding time of 8.33 ns was achieved for a 276-bit non-thermometer code to a 9-bit binary code conversion. We conducted a series of tests on the oscillating period of the wave union launcher, as well as the overall performance of the TDC; test results indicate that the IFTE works well. In fact, in the implementation of this encoder, no manual routing or special constraints were required; therefore, this IFTE structure could also be further applied in other delay-chain-based FPGA TDCs. 相似文献
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文章针对生物信息实验中的分类预测问题,以属性缺失数据为对象,结合朴素贝叶斯算法的特点,设计了一种基于改进EM算法的缺失数据朴素贝叶斯填充模型,并应用于蛋白质作用位点的定位研究中.实验结果表明,通过算法进行生物缺失数据的处理,在准确率、精度、召回率、ROC方面均获得了比其他方法更好的效果. 相似文献