无扩频矩阵知识二维扩频系统的盲同步

针对加性白高斯噪声信道,考虑未知二维扩频矩阵的条件下,提出了一种二维扩频系统的时频同步方法。该方法利用二维扩频矩阵周期性重复的特点,先估计出频率偏差,再通过滑动暂存窗求相关矩阵最大特征值,完成信号的时间同步。计算机仿真结果验证了该方法的有效性。     

论外资对我国零售业发展的影响及其对策

入世两年来 ,外资的大量进入 ,一方面给我国零售业自身的发展带来了积极的影响 ,但同时也带来了许多负面效应。面对新的发展机遇和挑战 ,我国的零售业必须采取积极的应对之策 ,以图自身的生存和发展     

收入差距与贫富差距的关系研究

收入差距属于经济问题,受生产要素的效益和分配方式制约.贫富差距属于社会问题,主要由社会制度决定.在市场经济下,收入差距直接导致贫富差距.但是,现阶段我国处在社会转型时期,二者的关系比较复杂.     

A note on the correlation structure of transformed Gaussian random fields

Transformed Gaussian random fields can be used to model continuous time series and spatial data when the Gaussian assumption is not appropriate. The main features of these random fields are specified in a transformed scale, while for modelling and parameter interpretation it is useful to establish connections between these features and those of the random field in the original scale. This paper provides evidence that for many ‘normalizing’ transformations the correlation function of a transformed Gaussian random field is not very dependent on the transformation that is used. Hence many commonly used transformations of correlated data have little effect on the original correlation structure. The property is shown to hold for some kinds of transformed Gaussian random fields, and a statistical explanation based on the concept of parameter orthogonality is provided. The property is also illustrated using two spatial datasets and several ‘normalizing’ transformations. Some consequences of this property for modelling and inference are also discussed.     

Spillover Between Marital Quality and Job Satisfaction: Long‐Term Patterns and Gender Differences

We used data from a 12‐year panel survey of a nationally representative sample of married individuals (not couples) and structural equation modeling to investigate the process of spillover between marital quality (satisfaction and discord) and job satisfaction among married individuals. We considered three questions: whether job satisfaction and marital quality are related over the long term, whether influence flows primarily from work to family or if there is a pattern of mutual effects between job satisfaction and marital quality, and whether job satisfaction and marital quality are related in similar ways for married women and married men over the long term. We found that marital quality and job satisfaction are related over the long term and that marital quality is the more influential of these domains. We found evidence of both positive and negative spillover from marital quality to job satisfaction over the long term. Specifically, increases in marital satisfaction were significantly related to increases in job satisfaction, and increases in marital discord were significantly related to declines in job satisfaction. Finally, our results indicated that these processes operate similarly for married women and married men.     

Distribution-free tests for independence against positive quadrant dependence: A generalization

A class of distribution-free tests based on two matched pairs is considered for testing independence against positive quadrant dependence. The class of tests proposed by Kochar and Gupta (1990) is a member of the proposed class. The performance of the proposed class is evaluated in terms of Pitman asymptotic relative efficiency for Block-Basu (1974) model and Woodworth family of distributions. The small sample performance of few members of the proposed class is also studied by finding empirical powers. Unbiasedness and consistency of the proposed class of tests have been established.     

研究分析学生在校成绩的典型相关分析法

本文应用典型相关分析方法分析大学生的学习成绩 ,并用实例介绍了这一方法的步骤 ,旨在为提高教学质量提供科学依据     

A robust modification of the ordered-heterogeneity test

An ordered heterogeneity (OH) test is a test for a trend that combines a non-directional heterogeneity test with the rank-order information specified under the alternative. We propose two modifications of the OH test procedure: (1) to use the mean ranks of the groups rather than the sample means to determine the observed ordering of the groups, and (2) to use the maximum correlation out of the 2^k???1 – 1 possibilities under the alternative rather than the single ordering (1, 2, … , k), where k is the number of independent groups. A simulation study indicates that these two changes increase the power of the ordered heterogeneity test when, as common in practice, the underlying distribution may deviate from a normal distribution and the trend pattern is a priori unknown. In contrast to the original OH test, the modified OH test can detect all possible patterns under the alternative with a relatively high power.     

大学本科基础课和专业课关系的典型相关分析法研究

本文针对大学本科基础课和专业课相关关系问题,在SAS系统支持下,运用典型相关分析法分析了大 学基础课和专业课的定量关系,找出了基础课中相对重要的课程因素。     

以生命的独特性与稀缺性修正泰勒的生命中心主义

以泰勒为代表的生命中心主义作为当代环境哲学的重要理论之一,从所有生命都具有自身善的事实结合“以生命为中心的世界观”的规范性论断对所有生命都应受到道德关怀进行了严密论证,并据此提出了四条人类应当履行的道德原则。泰勒的论证是有说服力的,但由于其侧重于生命个体,缺乏对生命整体的观察维度,忽视了某些对于生命来说具有重要意义的事实,使得其所推论出的规范性道德原则存在严重问题。其中的“不干涉原则”使得生命之间没有互相帮助的义务,人类不能介入那些能够毁灭生命的环境灾难以协助生命完成其自我保存的目的;而“不伤害原则”也几乎否定了人类所有的可能损毁生命的实践活动。面对这些问题,本文的解决思路如下:首先,从阐发泰勒的“拥有自身善的实体”的概念出发,分析生命具有目的这种独特性,并指出了生命所具有的三种目的,即自我保存的目的、作为实现自我保存目的的手段性目的、独立于自我保存的目的;其次,提出由于难以生产、分布范围极小、存在的偶然性而导致的生命的稀缺性,以及在诸多环境灾难面前表现出的脆弱性,推论出生命之间应当具有的积极责任;最后,论证了这种积极责任的必要性和可行性,认为基于生命的稀缺性和脆弱性,这种义务是紧迫的和必要的,而在履行这一义务的同时,人类将获得可能损毁其他生命的实践活动的正当性,并且由于这种正当性能够使人类产生按照积极责任而行的心理动机而使这种积极义务具有了可行性。由此,泰勒的生命中心论所面对的两个问题得以解决,对之的修正也由于提出的积极义务具有必要性和可行性而得以完成。