基于动量算法的常数模新算法

针对传统常数模算法收敛速度慢的缺点，提出了一种基于动量算法的常数模算法。该算法的权向量更新公式中添加了动量因子，以提高收敛速度。利用水声信道对算法的性能进行仿真研究，仿真结果表明：与常数模算法相比，该算法能较快收敛。     

A novel controller design and evaluation for networked control systems with time-variant delays

A new delayed state-variable model for networked control systems is presented, upon which a linear quadratic regulator (LQR) is designed. A method of delays-estimation online is also given. A fuzzy logic with LQR controller is addressed for the difficulty on implementation of LQR in networked control systems (NCSs) with time-variant delays. Simulation results prove that the novel controller can make the system stable and robustly preserve the performance in terms of time-variant delays.     

Estimation of 2-D ARMA model parameters by using equivalent AR approach

In this paper, the problem of estimating the parameters of a two-dimensional autoregressive moving-average (2-D ARMA) model driven by an unobservable input noise is addressed. In order to solve this problem, the relation between the parameters of a 2-D ARMA model and their 2-D equivalent autoregressive (EAR) model parameters is investigated. Based on this relation, a new algorithm is proposed for determining the 2-D ARMA model parameters from the coefficients of the 2-D EAR model. This algorithm is a three-step approach. In the first step, the parameters of the 2-D EAR model that is approximately equivalent to the 2-D ARMA model are estimated by applying 2-D modified Yule-Walker (MYW) equation to the process under consideration. Then, the moving-average parameters of the 2-D ARMA model are obtained solving the linear equation set constituted by using the EAR coefficients acquired in the first step. Finally, the autoregressive parameters of the 2-D ARMA model are found by exploiting the values obtained in first and second steps. The performance of the proposed algorithm is compared with other 2-D ARMA parameter and spectral estimation algorithms available in the technical literature by means of three different criteria. As a result of this comparison, it is shown that the parameters and the corresponding power spectrums estimated by using the proposed algorithm are converged to the original parameters and the original power spectrums, respectively.     

巴斯卡分布NB(r,p)中参数r的估计

巴斯卡分布NB（r,p)是重要的离散型分布之一，当r已知时，巴斯卡分布NB（r,p)中未知参数p(p∈（0，1））的估计是众所周知的。本文分别在p已知和未知的条件下，研究了参数r(r∈（1，2，…}）的估计，并得到了它们的渐近性质。     

需求与价格具有相关性下的弹性数量契约模型研究

在需求不确定且与价格具有相关性的前提下，建立了弹性数量契约模型，通过引入回馈与惩罚策略，解决了单纯的弹性数量契约无法实现供应链协作这一问题。并重点探讨以下两个主要内容：(1)如何确保供应链协作；(2)如何确定最优的零售价格和订购量。最后，通过数值例子对协作和分散两种模式进行了分析比较。     

Robust estimator design with an emphasis balance between performance and robustness

From a number of ML estimators (typically unbiased) of practical interest which include the variance for a Gaussian distribution, the standard deviation for a Laplace distribution, the variance for a Rayleigh distribution and a “spread parameter” for a Cauchy distribution, we design robust estimators according to an emphasis balance between normalized performance and normalized robustness. We measure performance with inverted MSE and robustness with a differential geometric approach.     

水平沟道场控晶闸管的设计与制作

水平沟道场控晶闸管是一种新型结构的场控晶闸管,它与一般晶闸管相比具有开关速度快、制作工艺简单、与集成电路工艺兼容等优点.本文概述了这种器件的原理、设计与制作工艺.     

A large-scale donor attempt to improve educational status of the poor and household income distribution: The experience of PEDC in Vietnam

In 2003, donors combined together in Vietnam to support the provision of quality primary schooling for 226 disadvantaged districts (about a third of the country). US$160 million was invested in infrastructure, materials and training across the 226 districts. The programme has been commended by donors and received good press inside Vietnam. Comparison of achievement surveys in 2001 and 2007 showed, however, that there had been a decline in performance in the targeted districts. This article explores various hypotheses as to how this could have happened; and in particular the increasing amounts spent by better-off households on their children's education.     

中国科技期刊“走出去”路径探析——以航空航天科技期刊为例

深化改革培育世界一流科技期刊是当前的紧迫任务,要求科技期刊“走出去”,在世界舞台与国际科技期刊同台竞争。为探索中国科技期刊“走出去”路径,以航空航天科技期刊为例,介绍当前该类期刊“走出去”现状,指出存在的问题,并分别从中英文刊的不同角度出发,阐述航空航天学术期刊“走出去”的可行路径,同时辅以案例分析,验证所提路径的有效性。强调“走出去”需要强化保护版权意识。这为探讨中国科技期刊如何“走出去”提供有益参考。     

金融危机企业资产负债表模型对我国的适用性检验-基于动态面板数据模型的分析

摘要：本文根据我国522家制造业上市公司2001-2007年的财务数据,建立动态面板数据模型,分析了Krugman(1999)提出的金融危机企业资产负债表模型对我国的适用性。研究结论认为,在企业存在货币错配的情况下,人民币汇率波动对企业的短期信贷能力有显著的影响,但对长期信贷能力的影响还不明显。而且,这种影响是动态的,人民币汇率波动的滞后1期值比当期值对企业信贷能力的影响更加明显。因而,金融危机企业资产负债表模型对我国具有适用性。