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。     

回到架上——兼论绘画与其他视觉传媒的相互转译

就当下艺术现状,尤其是架上艺术危机的分析,展开对绘画思想性的深刻思索,并通过对绘画与现代视觉传播媒介相互转译实验探讨,求取两者的不同所在,进而反映笔者对艺术现状的感知焦虑,以期在艺术的纯粹思维与纯粹摹写之间划定一个合理的空间,亦即确立纯艺术领域,用以对抗艺术消亡论观点.     

高校体育教育专业人才培养模式的现状与对策

文章对高校体育教育专业人才培养模式现状进行了分析,通过对修订培养目标、拓宽培养途径、优化课程设置、改革教学方法、提高师资力量等方面的研讨,进一步明确了高校体育教育专业人才培养模式改革的基本思路,以促进高校体育教育专业教学质量和人才质量的提高。     

Wilcoxon–Mann–Whitney test for stratified samples and Efron's paradox dice

Two-treatment multi-center clinical trials are the most common type of clinical trials in practice. The aim of this paper is to discuss a curious property of certain standard nonparametric procedures used in the analysis of such clinical trials. Different analyses of a simulated data example are presented, which lead to contrasting and surprising results. The source of the potentially misleading outcome is then explored while relating the simulated data with the concept of Efron's paradox dice and the notion of nontransitivity. With the root of the problem established, an alternate nonparametric method from the literature is shown to address the problem. Finally, pointing out an interpretational concern of using the alternate procedure, a modification to this procedure is also suggested and corresponding theoretical results are presented.     

论20世纪中国文学的古典性

20世纪中国文学是伴随着20世纪中国社会的思想革命、政治革命、经济革命和文化革命,承接着具有两千多年深厚文化底蕴的中国古典文学传统发展起来的。由于这些现代革命的不彻底性,中国文化和文学中的古典审美思想和美学诉求并没有得到根本改造,而作为新的审美诉求的现代性质素始终没有得到健康持续的培育,这使得20世纪中国文学呈现出较浓的载道性、外向功利性和正剧色彩三大古典审美特征。     

The analysis of incomplete data using stochastic covariates

In the development of many diseases there are often associated random variables which continuously reflect the progress of a subject towards the final expression of the disease (failure). At any given time these processes, which we call stochastic covariates, may provide information about the current hazard and the remaining time to failure. Likewise, in situations when the specific times of key prior events are not known, such as the time of onset of an occult tumour or the time of infection with HIV-1, it may be possible to identify a stochastic covariate which reveals, indirectly, when the event of interest occurred. The analysis of carcinogenicity trials which involve occult tumours is usually based on the time of death or sacrifice and an indicator of tumour presence for each animal in the experiment. However, the size of an occult tumour observed at the endpoint represents data concerning tumour development which may convey additional information concerning both the tumour incidence rate and the rate of death to which tumour-bearing animals are subject. We develop a stochastic model for tumour growth and suggest different ways in which the effect of this growth on the hazard of failure might be modelled. Using a combined model for tumour growth and additive competing risks of death, we show that if this tumour size information is used, assumptions concerning tumour lethality, the context of observation or multiple sacrifice times are no longer necessary in order to estimate the tumour incidence rate. Parametric estimation based on the method of maximum likelihood is outlined and is applied to simulated data from the combined model. The results of this limited study confirm that use of the stochastic covariate tumour size results in more precise estimation of the incidence rate for occult tumours.     

20世纪中国文学在韩国的研究回眸

回眸20世纪中国文学在韩国的研究轨迹,对韩中两国的学术界都有重要意义。20世纪韩国的中国现当代 文学研究与中国的研究方向差别不大,中国当代文学及港台文学研究方面较落后,研究对象集中。21世纪的研究倾 向是:韩国的中国当代文学研究更多起来,并脱离中国研究的既定道路,韩中比较文学研究相对活跃。     

论高校体育课程特色教材的构建

针对我国普通高校体育课程教材内容“千校一面”的实际，着眼于“学校教育要树立健康第一指导思想”观念的确立，以及学生对体育课程改革的期盼，构建适应新时代素质教育需要和符合高校自身专业特点与区域特色的体育教材。     

关于"体育社会问题"的辨析

体育社会学作为一门新兴的学科，已日趋成熟．其主要内容之一，是研究和解决体育社会问题，然而什么是体育社会问题，目前理论界尚无定论．该通过分析，指出了体育社会问题的两重属性：通性——危害社会秩序；特性——影响体育发展．同时尝试给出体育社会问题的定义，以供参考讨论．