光纤通信中级联码的码型

论述了光纤通信中级联码的码型选择,从净电编码增益、编码效率、相对色散代价以及实现的复杂程度等方面讨论了几种级联码,并认为RS(255,239)-BCH(2184,2040,12)级联方案在编码效率、色散代价以及实现的复杂程度方面具有较大的优越性。     

基于时间Petri网的供应链网络关键路径分析

讨论了供应链网络中如何选择优化路径的问题,提出采用时间P etri网对供应链网络关键路径建模的方法.此方法根据顾客需要货物的情况,有条件地选取供应链网络图中可跨越活动和可替换分支,将网络图分别描述成Ebs图和Ew f图,结合时间P etri网的可达算法,求得Ebs和Ew f的关键路径.通过基本供应链的分析,得到网络的优化路径.     

国家经济信息系统县级网络的投资及效益分析

本文讨论了国家经济信息系统县级网络的投资原则、效益分析方法及投资优化的数学模型,并给出了若干分析和计算的实例。     

利用DataSocket技术实现网络化虚拟仪器

介绍了网络虚拟仪器的概念和DataSocket技术的主要特点,并举例说明利用DataSocket技术实现网络虚拟仪器的过程.     

一种人工神经元：模型及分析

本文给出了一种人工神经元模型,并对其进行了分析,且将所获得的结果与神经生理学的结果作了比较。结论是该人工神经元能够模拟神经元一些主要特征,如潜伏期,时间、空间总和等。尤其是该模型较好地匹配了突触联接的非线性特性。     

Ovals and Hyperovals in Desarguesian Nets

We determine the Desarguesian planes which hold r-nets with ovals and those which hold r-nets with hyperovals for every r7.     

Net Clustering Based Constructive and Iterative Improvement Approaches for Macro-Cell Placement

We propose a net clustering based RT-level macro-cell placement approaches. Static timing analysis identifies critical nets and critical primary input/output paths. Net clustering (based on shared macro-cells and net criticality) yields clusters wherein each cluster has strongly interdependent nets. The circuit is modeled as a graph in which each vertex v represents a net and each edge (v,u) a shared cell between nets v and u. The net clusters are obtained by applying a clique partitioning algorithm on the circuit graph. Two approaches to generate placements at RTL are proposed: constructive (cluster growth) approach and iterative improvement (simulated annealing) based approach. In the constructive approach, a cluster-level floorplanning is performed and a cluster ordering is obtained. The cluster ordering is used by a constructive procedure to generate the physical placement. In the case of iterative improvement based approach, a good ordering of clusters is obtained using simulated annealing.We report experimental results for five RTL datapaths implemented in 0.35 m technology to demonstrate the efficacy of the proposed approaches. We compared the layouts produced by our approaches with those produced by Flint, an automatic floor planner in Lager IV Silicon Compiler [1]. For constructive placement approach, we obtained an average decrease of 43.4% in longest wirelength and 32.4% in total wirelength. The average area reduction is 7.3%. On the other hand, for the SA-based approach, we obtained an average decrease of 57.6% in longest wirelength and 42.2% in total wirelength. The average reduction in the bounding-box area is 12.3%. As expected, the SA-based approach yielded better optimization results, due to its ability to climb out of local minima.     

The Hardy--Littlewood Theorem for Fourier--Haar Series

An interpolation theorem for a class of net spaces is proved. In terms of Fourier--Haar coefficients, we obtain a test for a function to belong to the net space N _p ^q (M), where 1相似文献   

国际贸易中汇率调整的影响分析

本文用对策论主要分析行业内国际贸易中，汇率调整对贸易国净社会福利的影响．证明存在值e，汇率e＞e和e＜e，提高汇率对该国净社会福利的影响结果是不同的．并给出了e具有经济意义的上下界及计算途径．     

A Theory of Nets for Polyhedra and Polytopes Related to Incidence Geometries

Our purpose is to elaborate a theory of planar nets or unfoldings for polyhedra, its generalization and extension to polytopes and to combinatorial polytopes, in terms of morphisms of geometries and the adjacency graph of facets.