一种基音提取算法

根据基音周期平滑变化的特点,基于语音信号的准周期性进行了语音信号的基音提取。该算法主要针对多带激励模型（ＭＢＥ）,采用传统的时域分析法,先用语音信号的相关性进行基音周期的估计,再由分数延迟法提取基音周期,使预测结果更加准确,更具实时性,有利于语音编码与识别。     

按份共有人优先购买权若干争议问题探析

按份共有人优先购买权与按份共有关系相始终,无需公示就具有对抗第三人的效力。在所有权以外的其他财产权的准按份共有关系中,除地役权和担保物权的准按份共有之外,均得适用按份共有人优先购买权制度。行使该权利的结果,可使权利人优先于第三人取得被出卖的共有份额。在多数按份共有人依多数决原则出卖共有物时,不同意出卖的共有人对同意出卖的共有人所持的共有份额不享有优先购买权。     

具有多重势的分数阶非线性Schrodinger方程解的适定性

讨论了具有多重势的分数阶非线性Schrodinger方程的周期边值问题,利用能量估计和Faedo—Galerkin方法证明了该问题光滑解的整体存在唯一性     

论康德审美四契机理论中二、四契机之异同

康德审美四契机理论由于其以逻辑统辖心理的理论形态,形成了“审美矛盾结构”。人们对如何理解这一矛盾结构,如何看待其中第二、第四契机历来聚讼纷纭。本文抓住审美矛盾结构的“合”的环节,从康德哲学、美学体系出发,在四契机理论的整体把握中辨析二、四契机之异同。     

几类循环图的分数染色数

通过构造几类图的最大独立集,给出了它们的分数染色数的下界;再通过构造具有该下界值的分数染色,给出了这几类循环图的分数染色数的上界,于是就确定了它们的分数染色数.     

论环境公平视野下农村环境污染治理的对策

近年来,环境公平问题在农村社会凸显,严重威胁着农村社会的环境安全和农村环境污染的治理。城乡环境不公更成为农村环境污染治理的重要制约因素。农村居民在环境资源的分配使用、环境污染后果的承担等方面都明显处于不公平的境遇。因此应当结合环境公平理论的新要求以环境公平为基本理念构建新的农村环境污染治理政策,实现城乡环境经济的一体化发展。     

Estimating the parameters of Poisson-exponential models

This paper proposes two methods of estimation for the parameters in a Poisson-exponential model. The proposed methods combine the method of moments with a regression method based on the empirical moment generating function. One of the methods is an adaptation of the mixed-moments procedure of Koutrouvelis & Canavos (1999). The asymptotic distribution of the estimator obtained with this method is derived. Finite-sample comparisons are made with the maximum likelihood estimator and the method of moments. The paper concludes with an exploratory-type analysis of real data based on the empirical moment generating function.     

Moments and generating functions for the absortion distribution and its negative binomial analogue

The moments of the absorption are difficult to obtain. The generating functions are basic hypergeometric functions. This paper shows how to define two shift operators that allow elementary arguments to be used to develop recursions for the expected values of general functions. The exact moments of the distribution follow. The generating function for the negative binomial analogue gives the moments directly.     

分数布朗运动下带违约风险的可转换债券定价

应用均衡定价方法,考虑股票价格和公司资产价值服从分数布朗运动以及存在公司违约风险情况下的可转债定价问题;建立相应的可转债定价模型,采用拟鞅定价方法,得出了欧式看涨期权的显式解,进而得出了可转债定价公式;最后利用数值算例进行分析,结论表明公司违约风险、股票价格和公司资产价格的长程关联性是可转债定价时不可忽略的因素。     

On drift parameter estimation in models with fractional Brownian motion

We consider a stochastic differential equation involving standard and fractional Brownian motion with unknown drift parameter to be estimated. We investigate the standard maximum likelihood estimate of the drift parameter, two non-standard estimates and three estimates for the sequential estimation. Model strong consistency and some other properties are proved. The linear model and Ornstein–Uhlenbeck model are studied in detail. As an auxiliary result, an asymptotic behaviour of the fractional derivative of the fractional Brownian motion is established.