静止图像数据的压缩方法

根据静止图像中冗余信息的特点，介绍了用可变长游程编码和离散余弦变换的方法对静止图像数据进行压缩。     

Semiparametric Mixtures of Symmetric Distributions

We consider in this paper the semiparametric mixture of two unknown distributions equal up to a location parameter. The model is said to be semiparametric in the sense that the mixed distribution is not supposed to belong to a parametric family. To insure the identifiability of the model, it is assumed that the mixed distribution is zero symmetric, the model being then defined by the mixing proportion, two location parameters and the probability density function of the mixed distribution. We propose a new class of M‐estimators of these parameters based on a Fourier approach and prove that they are ‐consistent under mild regularity conditions. Their finite sample properties are illustrated by a Monte Carlo study, and a benchmark real dataset is also studied with our method.     

On the Ratios of Pathway Random Variables

A study of the densities of ratios of independently distributed random variables following the pathway model, Mathai (2005 Mathai, A.M. (2005). A pathway to matrix - variate gamma and normal densities. Linear Algebra Appl. 396:317–328.[Crossref], [Web of Science ®] , [Google Scholar]), is carried out. The density functions of these random variables are obtained in terms of H-function. The particular cases of the integral forms are shown to be associated with Tsallis statistics and Beck–Cohen superstatistics. Many other special functions coming under the general density are also included. We plotted the density function of the ratio of these random variables for the different values of the pathway parameters. Real-life application of the results in communication theory related to the signal–noise ratio is illustrated.     

论家族企业经营管理模式的选择分析

沿着家族企业发展路径,对家族企业经营管理模式路径选择及因素进行分析,家族企业经营管理模式的选择应是外部条件成熟,内部发展需要的自然过程。其效率选择应与企业的不同发展阶段和市场的不同发育阶段相一致。对以“催熟”方式鼓励家族企业以转换关键的亲缘企业关系,应持谨慎态度。     

重叠频分复用系统循环前缀的设计和分析

研究了在时变多径频率选择性衰落信道条件下,重叠频分复用/非正交频分复用系统的离散傅里叶变换实现,并对OvFDM-DFT系统的循环前缀进行了分析和设计,讨论了两种不同的循环前缀设计方法,即普通循环前缀和补零方式循环前缀对系统性能的影响。分析和仿真结果表明,在时变多径频率选择性衰落信道条件下补零方式的循环前缀远好于普通方式的循环前缀,仿真结果也验证了OvFDM符号具有明显的抗衰落性能。     

新户籍制度加快农村剩余劳动力转移的两个理论分析

"推--拉"理论和"二元经济结构"理论是农村剩余劳动力转移的两个理论依据;加快农村剩余劳动力的转移需要改革原有的户籍制度,城乡统一登记管理的新户籍制度对推拉力和二元经济结构产生影响,将加快农村剩余劳动力的转移.     

建筑施工Petri网建模技术研究

本文基于网络计划采用赋时Perri网对施工计划建模进行了研究。Petri网能够以图形方式深刻、简洁地描述系统的动态过程,精确描述事件的顺序、并发和冲突关系,使系统形象化,有利于理解。网络计划技术已经在建筑工程实践中得到了广泛的应用,以网络计划为基础,采用Petri网对施工进度计划进行建模可以有效地降低施工建模的复杂性。本文首先讨论了网络计划和Petri网基本元素的对应关系,然后对Petri网进度计划模型的转变规则进行了研究,采用面向对象的技术分别对模型元素、元素之间的关系、模型的层次和性能评价分析的指标进行了讨论,从而确定了模型转换的机制。最后以具体工程实例说明了Petri网施工进度计划模型的生成,并对模型进行了分析,证明了采用本方法的有效性。     

“知识考古学”与现当代文学研究的范式转换

借助福柯的"知识考古学",现代文学突破了"从五四谈起"的起源上限,拓展了学科时空领域,缓解了学科焦虑,超越左翼文学史观的局限,发现了现代文学的"多种现代性",形成了众声喧哗的研究局面。"十七年文学"改变了情感化、政治化的简单视角,分析文学成规显形与隐形的规则,致力于还原历史情境,转变为两个时代的平等对话,获得了鲜明的文学史意识。"重返八十年代"解构了文学叙述成规,以历史的后见之明,展示流行概念和范畴的背景、条件和关系,探求文学制度再生产的历史性。福柯的"知识考古学"及"谱系学"方法的引入,使现当代文学研究实现了研究"范式"的转换。但是,"知识考古学"滑入犬儒主义与失去道德责任的危险,以及它在现实操作层面上的局限性,是我们运用"知识考古学"进行文学研究所必须警惕的。     

季节型增长趋势电力消费预测研究：基于中国的实证分析

以我国月电力消费量为例,研究了季节型增长趋势中长期电力指标的预测问题。提出采用离散小波变换对季节型增长趋势历史数据进行分解并对各频率分解系数分别进行重构,在剔除随机性波动后,将长期增长趋势及各规律性波动趋势通过RBF网络进行趋势外推预测,进而通过对不同趋势预测结果进行组合得到电力消费量的预测值。实证分析表明,经过离散小波分解处理后,RBF网络样本的规律性得到增强,其在有效模拟非线性变化规律的同时,泛化能力得以提高,因而具有较好的预测精度。     

Testing regions with nonsmooth boundaries via multiscale bootstrap

A new class of approximately unbiased tests based on bootstrap probabilities is obtained for the multivariate normal model with unknown expectation parameter vector. The null hypothesis is represented as an arbitrary-shaped region with possibly nonsmooth boundary surfaces such as cones, which appear in, for example, multiple comparisons and hierarchical clustering. The size n^′$n^{\prime }$ of bootstrap samples is intentionally altered from the size n of the data. A scaling-law of the bootstrap probability leads to our bias corrected p  -values which are calculated by extrapolating the bootstrap probability back to n^′=-n$n^{\prime }=-n$. The new method approximates the bootstrap iteration applied to the bootstrap probability.