宽带无线通信中的MIMO系统

介绍了多入多出系统中的空时、空频编码技术,并在此基础上将OFDM技术与MIMO系统相结合,研究了STBC-OFDM、SFBC-OFDM及VBLAST-OFDM系统。对该系统性能进行了分析和仿真,结果表明VBLAST系统传输速率最高,其速率至少是分组码MIMO-OFDM系统的2倍,但是其误码性能相对较差,误码率为0.001时,VBLAST-OFDM系统所需的信噪比比分组码系统要高9.3dB。     

《论语》及其英译本中投射语言的人际功能分析

《论语》英译的各种翻译策略已受到越来越多研究者的关注,但《论语》中投射语言翻译研究还未能引起足够的重视。因此,本文运用系统功能语言学的人际功能分析方法,从语气、语气成分、人称等角度探讨与比较了《论语》原文及其四个英译本中投射语言人际意义的实现方式。我们发现,不同译者对投射语言的相关翻译策略不尽相同,这在不同程度上反映了译者由于翻译目的的不同及对原文投射语言人际意义的理解差异,产生了对原文相关投射语言人际意义的认知程度的差异,从而采用了不同的翻译策略。     

动态用户最优配流问题的投影算法研究

本文首先建立了动态用户最优配流问题的变分不等式模型,并对此模型用投影算法来求解.本文中的模型满足Wordrop第一原理要求,所给算法在每一个小时段都能给出路段流入率、流出率及路段流量,从而为行人出行提供可靠的、实时的信息,所给数值实验也说明该模型和算法是可行且有效的.     

超声波灭菌在椰奶中应用研究

探索超声波对椰奶中微生物的杀灭效果,主要选取超声波处理功率、处理温度、处理时间三个关键因素,以椰奶中菌落总数为指标做单因素分析。每个因素选取三个水平,通过三因素三水平正交设计,确定超声波灭菌的最佳参数。     

21世纪中国人口面临的艰难抉择──生育率与人口规模·老龄化的前瞻

总人口、老年人口规模与生育率呈正向变化以及老龄化程度与生育率呈反向变化的矛盾, 决定了低生育率导致人口数量较少但高度老龄化; 高生育率导致人口规模扩大但老龄化程度较低,造成未来生育政策调整的艰难抉择。促进人口与社会经济、资源环境的协调发展和可持续发展是未来中国发展的最主要矛盾,继续坚持低生育率政策,坚持严格控制人口数量是首要任务     

基于CFD的离心泵结构参数优化

为获得离心泵的最佳结构参数，根据给定的离心泵设计参数确定离心泵的结构形式和性能评价指标，计算离心泵各结构参数，利用CFD对离心泵进行流场数值模拟分析，设计了叶轮结构L16（45）正交实验表，选择叶轮进口安装角βb1、出口安装角βb2、包角φ、进口直径D1、出口直径D2为正交实验的5个因素，完成了正交实验并对实验结果进行极差分析，得到各结构参数对各优化方向评价指标影响排序及其影响情况，构造出效率最大、汽蚀余量最小条件下的目标函数及统一目标函数，并运用遗传算法对离心泵效率和汽蚀进行多目标优化，得到离心泵的最佳结构组合参数.     

The Reform of Mutual Aid Associations in Japan: Civil Service Employee Pension Reform in 2012

Civil service employee pension reform began by removing non‐clerical work from the main body of the Mutual Aid Association (MAA) pension system. Further changes were based on administrative reform and pension jealousy. In particular, the Nakasone cabinet's administrative reform privatized the non‐clerical sector. Before the 1979 reform, the pensionable age was 55 for the MAA and 60 for the Employee Pension Insurance (EPI) scheme. The MAA pension benefit formula adopted the final salary system, which was larger than the average lifetime salary calculation used for EPI benefits. The final salary system was abolished during the 1986 reform. Public employee criticism over “Amakudari” led to further civil service employee remuneration reform in 2005. In 2007, the Social Insurance Agency pension record scandal led to a change of government by 2009. The biggest reform of the MAA pension system was the abolishment of the occupational portion of the pension, a compromise between the government and unions. We project that this compromise will cost 22 trillion yen over 90 years old. After 2055, the newly established MAA pension scheme will be abolished; thus the public pension may finally be sustainable.     

The future of work: Meeting the global challenges of demographic change and automation

This article explores future job creation needs under conditions of demographic, economic and technological change. The authors first estimate the implications for job creation during 2020–30 of population growth, changes in labour force participation and the achievement of target unemployment rates, by age and sex. Second, they analyse the job creation needs by country income group and, lastly, examine the effects of accelerated automation. Projections indicate that shifting demographics will account for a far greater share of the estimated global need for 340 million jobs over 2020–30 than automation.     

Efficiency-consistency in designs

It is shown that if an interaction is estimated orthogonally to all other interactions in an equireplicate connected n-factor design, then the design is efficiency-consistent for this interaction.     

Divergences and duality for estimation and test under moment condition models

We introduce estimation and test procedures through divergence minimization for models satisfying linear constraints with unknown parameter. These procedures extend the empirical likelihood (EL) method and share common features with generalized empirical likelihood approach. We treat the problems of existence and characterization of the divergence projections of probability distributions on sets of signed finite measures. We give a precise characterization of duality, for the proposed class of estimates and test statistics, which is used to derive their limiting distributions (including the EL estimate and the EL ratio statistic) both under the null hypotheses and under alternatives or misspecification. An approximation to the power function is deduced as well as the sample size which ensures a desired power for a given alternative.