一种基于均值量化的小波域自同步数字音频水印算法

提出了一种基于均值量化的小波域自同步数字音频水印算法。该算法是一种盲检测算法,检测时不需要原始音频信号。算法引入了系数均值量化的思想,音频信号进行小波分解后,对其中的低频系数进行均值量化,嵌入水印;并且引入了嵌入同步信号的思想,利用同步信号来定位水印的嵌入位置,以抵抗平移、裁剪等攻击。实验结果表明该算法具有较强的鲁棒性和抗攻击性。     

中国地级以上城市基础设施评价研究

考察了城市基础设施的内涵,建立了由3个层级、5个维度和22个指标构成的城市基础设施评价体系,并采用极差标准化、均方差决策、加权平均和标准分等方法,对中国2007年287个地级及以上城市的基础设施建设水平从发展排序、等级划分、空间分异和统计分布等方面进行了全面、系统的评价研究。结果显示:城市基础设施具有和经济发展相似的自东向西递减的地带性特征;大部分城市的基础设施发展不均衡,存在短板;全国地级以上城市基础设施的总体水平呈正态分布,环境设施呈尖峰左偏分布,交通设施呈尖峰右偏分布,供排水设施属于平顶正态分布,能源设施分布曲线波动较大,邮电设施分布严重右偏。本研究为城市基础设施建设提供政策思路和科学依据。     

Diagnostics analysis for log‐Birnbaum–Saunders regression models with censored data

This article develops influence diagnostics for log‐Birnbaum–Saunders (LBS) regression models with censored data based on case‐deletion model (CDM). The one‐step approximations of the estimates in CDM are given and case‐deletion measures are obtained. Meanwhile, it is shown that CDM is equivalent to mean shift outlier model (MSOM) in LBS regression models and an outlier test is presented based on MSOM. Furthermore, we discuss a score test for homogeneity of shape parameter in LBS regression models. Two numerical examples are given to illustrate our methodology and the properties of score test statistic are investigated through Monte Carlo simulations under different censoring percentages.     

我国股票市场上艾略特波浪模式存在性初探

上证指数是描述中国股票市场运动状况的重要代表,Fibonacci数列包含了艾略特波浪模式中重要的数量特征。本文验证了在艾略特波浪模式下,上证指数中黄金比率和Fibonacci数字的存在性,给出了我国股票市场上艾略特波浪模式存在的一个重要实例,是对股票价格随机游动假说的一个冲击。     

Compromised imputation in survey sampling

In this paper, a compromised imputation procedure has been suggested. The estimator of mean obtained from compromised imputation remains better than the estimators obtained from ratio method of imputation and mean method of imputation. An idea to form “Warm Deck Method” of imputation has also been suggested. Received: July 1998     

Developing and validating a psychometric shopper-based mall equity measure

This paper introduces a new retailing concept called shopper-based mall equity (SBME). SBME is the differential effect of mall knowledge on shoppers' responses to a mall's marketing activities. The results of a study in two Canadian shopping malls consisting of 905 shoppers who were administered a questionnaire suggest that SBME is a bi-dimensional construct, composing two sub-scales, namely mall awareness and mall image. Further psychometric tests show a parsimonious SBME measure with support for convergent, discriminant and predictive validities. Multi-group latent mean structures show that the SBME measure is able to discriminate shoppers that globally attribute high-mall scores from those who globally attribute low-mall scores. The article includes theoretical and managerial implications.     

环境经济手段在水污染治理中的应用研究——以太湖流域为例

以太湖流域为例，引入环境经济手段中的价格体系，实证分析了上下游地区通过构建生态补偿机制，贯彻“污染者付费”原则，实施“跨行政区合作治理”，从而根本解决水污染的“公地悲剧”，实现区域间环境公平和可持续发展。     

OPTIONED PORTFOLIO SELECTION: MODELS AND ANALYSIS

The mean‐variance model of Markowitz and many of its extensions have been playing an instrumental role in guiding the practice of portfolio selection. In this paper we study a mean‐variance formulation for the portfolio selection problem involving options. In particular, the portfolio in question contains a stock index and some European style options on the index. A refined mean‐variance methodology is adopted in our approach to formulate this problem as multistage stochastic optimization. It turns out that there are two different solution techniques, both lead to explicit solutions of the problem: one is based on stochastic programming and optimality conditions, and the other one is based on stochastic control and dynamic programming. We introduce both techniques, because their strengths are very different so as to suit different possible extensions and refinements of the basic model. Attention is paid to the structure of the optimal payoff function, which is shown to possess rich properties. Further refinements of the model, such as the request that the payoff should be monotonic with respect to the index, are discussed. Throughout the paper, various numerical examples are used to illustrate the underlying concepts.     

拉格朗日插值多项式于平方收敛意义下的收敛逼近阶

本文得到了以 Legendre 多项式及以 Tchebycheff 多项式的导数的零点为插值结点组的拉格朗日插值多项式于平方收敛意义下的收敛速度。     

应用抽油机节能变速器实现稠油低冲次井的节能降耗

许多稠油井抽油机因为油稠、负荷重，必须采用低冲次采油，现场应用较多的是磁调速电机来调整冲次．虽然能够达到降低冲次的目的，但是电机损耗较高。抽油机节能变速器是一种针对低冲次高耗井的节能装置，是磁调速电机的替代产品。通过变速装置降低电机对抽油机变速箱的传递速度，改变电机扭矩，降低了电动机运行的均方根电流；既能达到到低冲次采油的目的，又有明显的节能效果。