The Region 1 & 3 Broadcasting‐Satellite Service Plan after WRC‐03

The 1977 Broadcasting‐Satellite Service (BSS) Plan for Region 1 & 3 had been widely acknowledged to be out‐of‐date by the late 1980s. Development of digital modulation in the early 1990s provided an opportunity to update the technical provisions of the Plan to make it more economically viable. After a decade of work and three World Radiocommunication Conferences (WRCs), the revision of Region 1 & 3 BSS Plan was finally completed in 2003. The new Plan increased channel assignments from 5 to 10 analog‐equivalent channels for each country in Region 1, and from 4 to 12 channels for each country in Region 3. Yet, despite the increase in capacity, the new Plan is surprisingly similar to the original one in terms of the technical parameters. It is still based on national coverage, and the channel plan, orbital location, orbital spacing, and polarization are also the same. As a result, the new Plan is no more economically viable to implement than the old. To create economically viable BSS systems would most likely require modifications to the assignment in the Plan. Yet, modification procedures were made more difficult to apply after replanning. Less future implementation of BSS networks than would otherwise have occurred can be expected, and an inefficient usage of these frequency bands will likely result. On the other hand, less implemented systems will mean more capacity set aside for future use. This is important for countries that currently do not have satellite operations. In the end, BSS replanning reflects the eternal conflict between efficient usage and guaranteed future access. Copyright © 2005 John Wiley & Sons, Ltd.     

预付费及后付费融合的业务支撑系统探讨

针对预付费及后付费业务融合如何实现，提出并分析了融合支撑系统的组成、功能结构、流程，对融合支撑中涉及到的重要问题和对现有系统的影响进行了探讨、分析并提出了建议.     

职工持股计划在中国:理论上可行,实践上慎行

在对中美两国的职工持股计划进行分析后,本文认为职工持股计划在中国,理论上可行,但在实践中 需要谨慎行事。     

ARD算法收敛性分析

对交替行对角化（ARD）算法收敛性进行分析.基于收敛性分析,给出了一些关于如何选取初始矩阵的策略,提出了算法终止的新准则.通过3个数值例子来说明所提出的分析策略的有效性.     

EEMD与EFICA在单通道复合故障诊断中的应用

针对转子不对中和滚动轴承微弱损伤的复合故障诊断问题,提出了一种基于平均经验算法(Ensemble Empirical Mode Decomposition,EEMD)和高效快速独立分量分析(Efficient Variant of FastICA,EFICA)的盲源分离故障诊断方法。利用EEMD算法将单通路复合故障信号分解成多个不同信号特征的本征模函数(Intrinsic Mode Function,IMF),解决了盲源分离中的欠定问题。在此基础上利用EFICA算法对各个不同信号特征的IMF进行故障特征分离。通过仿真实验和转子实验台的实验结果,表明该算法可以有效分离出各个不同的故障特征。     

频域盲源分离的邻频幅角比排序算法

频域盲源分离方法通过STFT变换将时域的线性卷积模型转化为频域的瞬时混合模型,可以利用瞬时混合的成熟算法,然而缺点是存在排列和尺度的不确定性,会使逆STFT变换后的信号发生再次混叠。对分离矩阵内部结构进行研究,提出邻频幅角比的概念,通过纠正图样中发生排列错误频点处的分离矩阵结构,达到正确拟合已分离信号的目的。仿真结果表明,邻频幅角比排序算法可以纠正大多数频点上的排序错误,正确进行盲源分离。     

Oracle 10g分析在新一代联通业务支撑系统中的应用

为确保新一代联通业务支撑系统(BSS)的持续稳定和快速响应,本文详细阐述了Oracle 10g分析在新一代联通BSS系统中的应用,同时充分比较了Oracle 9i和10g在分析方面某些不同之处.实践证明,这种分析方法的应用切实达到了预期效果.     

金融信息系统应急响应及演练

针对金融、保险等行业的信息系统的特点,提出应急响应、预案编制和演练的方法,并以银行系统为例给出具体的应急及演练方案。     

频域单源区间和欠定的盲信号分离

探讨在感知器个数少于源信号个数时的盲分离问题,提出频域中的单源区间矩阵恢复方法,以实现时域检索平均法在频域中的扩展,与传统的聚类算法相比,该算法计算简单、精度高,在理论上能够无偏差地估计混叠矩阵。在源信号的恢复上,根据稀疏的原则,在仅m个源在频域中较大、其余源可近似为0的假设下,得出求解L1范数的简化方法。语音信号仿真实验展示了该方法的性能和实用性。     

A new representation and associated algorithms for generalized planning

Constructing plans that can handle multiple problem instances is a longstanding open problem in AI. We present a framework for generalized planning that captures the notion of algorithm-like plans and unifies various approaches developed for addressing this problem. Using this framework, and building on the TVLA system for static analysis of programs, we develop a novel approach for computing generalizations of classical plans by identifying sequences of actions that will make measurable progress when placed in a loop. In a wide class of problems that we characterize formally in the paper, these methods allow us to find generalized plans with loops for solving problem instances of unbounded sizes and also to determine the correctness and applicability of the computed generalized plans. We demonstrate the scope and scalability of the proposed approach on a wide range of planning problems.