GPS接收机P(Y)直捕方法研究

GPS接收机P(Y)直捕算法是基于存储的滑动相关搜索,并利用FFT将时频二维联合搜索变成时域一维搜索。同时,考虑位同步点已知的条件,接收资源池只需存储一段接收序列,缩短了捕获时间且利于硬件实现。仿真结果表明,多普勒频移为±5kHz时,所带来的峰值衰减为2dB左右,本地信号与接收信号对齐时出现明显的相关峰,很好地实现了捕获功能;提出了用重叠分段补零FFT操作实现并行相关,成倍降低了捕获时间;提出了利用位同步信息,避免了码极性翻转可能引起的信噪比损耗;针对码相位漂移,提出了优化捕获策略,可在短时间内完成重捕。     

从小说、戏曲看牛女传说在明代的演变

明代是牛女传说演变的重要时期.明初,出现了企图从根本上否定牛女传说的短篇小说.明后期,由文人重述的牛女传说出现,产生了以此为题材的小说、戏曲作品.文人重述的牛女传说在情节、内容和人物形象上有了变异,初步实现了文人创作同民间牛女故事的结合.     

A multivariate zero-inflated binomial model for the analysis of correlated proportional data

In this paper, a new multivariate zero-inflated binomial (MZIB) distribution is proposed to analyse the correlated proportional data with excessive zeros. The distributional properties of purposed model are studied. The Fisher scoring algorithm and EM algorithm are given for the computation of estimates of parameters in the proposed MZIB model with/without covariates. The score tests and the likelihood ratio tests are derived for assessing both the zero-inflation and the equality of multiple binomial probabilities in correlated proportional data. A limited simulation study is performed to evaluate the performance of derived EM algorithms for the estimation of parameters in the model with/without covariates and to compare the nominal levels and powers of both score tests and likelihood ratio tests. The whitefly data is used to illustrate the proposed methodologies.     

辽河口斑海豹

一直以来,我喜欢着辽河口的冰排,以及冰排上的斑海豹。辽河口位于盘锦市西郊,每年春节前后,都会有大片大片的冰排游移堆积而来,层层累累,气喘嘘嘘。彼时的阳光多半是疲惫的,懒懒地从天空西南角斜射下来,在冰排上扫出一道鲜明的     

中俄战略协作伙伴关系前景探析

目前,中俄战略协作伙伴关系已成为具有全球性影响的重要的双边关系,在地区和世界范围内发挥着日益重要的作用.中俄战略协作伙伴关系的建立是两国的共同需要,是两国的国家利益所决定的.因此,中俄战略协作伙伴关系将长期存在和发展.同时,由于中俄国家发展战略的差异性以及美国因素的存在,中俄战略协作伙伴关系的长期发展也将面临一定的局限性.     

Confidence interval estimation of the difference between paired AUCs based on combined biomarkers

In many diagnostic studies, multiple diagnostic tests are performed on each subject or multiple disease markers are available. Commonly, the information should be combined to improve the diagnostic accuracy. We consider the problem of comparing the discriminatory abilities between two groups of biomarkers. Specifically, this article focuses on confidence interval estimation of the difference between paired AUCs based on optimally combined markers under the assumption of multivariate normality. Simulation studies demonstrate that the proposed generalized variable approach provides confidence intervals with satisfying coverage probabilities at finite sample sizes. The proposed method can also easily provide P-values for hypothesis testing. Application to analysis of a subset of data from a study on coronary heart disease illustrates the utility of the method in practice.     

Composite quantile regression for varying-coefficient single-index models

ABSTRACT

The varying-coefficient single-index model (VCSIM) is a very general and flexible tool for exploring the relationship between a response variable and a set of predictors. Popular special cases include single-index models and varying-coefficient models. In order to estimate the index-coefficient and the non parametric varying-coefficients in the VCSIM, we propose a two-stage composite quantile regression estimation procedure, which integrates the local linear smoothing method and the information of quantile regressions at a number of conditional quantiles of the response variable. We establish the asymptotic properties of the proposed estimators for the index-coefficient and varying-coefficients when the error is heterogeneous. When compared with the existing mean-regression-based estimation method, our simulation results indicate that our proposed method has comparable performance for normal error and is more robust for error with outliers or heavy tail. We illustrate our methodologies with a real example.     

试论中央与民族自治地方的经济关系

经济关系是民族关系的核心和基石,处理好经济关系,对于妥善解决政治、文化等其他关系具有十分重要的意义。应规范、完善处理中央与民族自治地方经济关系的法律,并以此为依据,严格执行。中央与民族自治地方经济关系主要包括资源共享、财权划分、财政援助、经济自治等四个方面;中央与民族自治地方的经济关系总体上是良好、和谐的。     

Re-employment Investigation of Peasant Workers Returning Home in Six Provinces

Upsurge of Peasant Workers Returning Home For the vast number of peasant workers, this winter in 2009 may be unprecedentedly cold.     

"中国信心":当代中华民族凝聚力的现实解读

"中国信心"不仅仅是一个新闻词汇或政治口号,而是引领当代中国社会发展的民族精神和时代精神的精华.在内涵上,"中国信心"是民族性与时代性的辩证统一,是中国特色社会主义理论体系的重要内容;在本质上,"中国信心"是成就感与使命感的高度结合,是社会主义精神文明建设的时代展示;在功能定位上,"中国信心"是当代中华民族凝聚力增强的鲜明亮点,对提升国家文化软实力具有重要意义.