Statistical inference for a single-index varying-coefficient model

We investigate the estimators of parameters of interest for a single-index varying-coefficient model. To estimate the unknown parameter efficiently, we first estimate the nonparametric component using local linear smoothing, then construct an estimator of parametric component by using estimating equations. Our estimator for the parametric component is asymptotically efficient, and the estimator of nonparametric component has asymptotic normality and optimal uniform convergence rate. Our results provide ways to construct confidence regions for the involved unknown parameters. The finite-sample behavior of the new estimators is evaluated through simulation studies, and applications to two real data are illustrated.     

无线人体局域网基带发射模型研究

随着无所不在的医疗保健时代的来临,人体局域网(BAN)受到了国内外研究人员的广泛关注。为了促进人体局域网技术的发展,IEEE 802.15-TG6小组拟定了BAN技术规范草案,该技术规范草案中定义了三个物理层:窄频带、超宽带、人体通信。本文将对BAN窄带物理层发射模型进行研究。BAN基带发射模型包括信道编码、扩频、交织、扰码、调制。根据草案提出的规范,搭建BAN基带发射浮点数模型,并对搭建的模型进行仿真验证。结果表明,在适当的信噪比情况下,搭建的基带发射浮点数模型得到了较理想的误码率,满足了BAN通信技术的要求,为后续BAN物理层研究打下了基础,同时也有利于整个BAN物理层基带的完善。     

BAN网络节点低功耗MAC协议的设计

本文针对IEEE802.15.6标准中的MAC层协议采用固定保护时间弥补时钟漂移而造成能量浪费这一问题研究并实现一种低功耗的适宜BAN网络的MAC协议。该协议依据超帧结构的模式构建了一种新的MAC帧结构模型,并结合时间补偿算法对帧结构中的保护时间进行自适应调整,最后使用OPNET14.5仿真两种MAC协议。结果表明,本文研究的基于自适应时间补偿帧结构的MAC协议相对于固定的保护时间IEEE802.15.6的MAC协议而言,降低了终端节点能耗以及延长了网络的生存周期。     

重庆市新一轮经济发展的增长点研究──非公有制经济发展的现状、问题及对策

阐释非公有制经济成为重庆新一轮经济发展重要增长点的历史必然性,分析重庆非公有制经济发展的现状及其矛盾,提出加速发展非公有制经济的九项对策建议。     

SC2053在川西化杀杂种小麦组合筛选中的应用初报

报道了我所利用SC2 0 53在杂种小麦研究中的应用情况。研究认为 :①多数小麦品种在剂量为 0 .6kg/hm2 ,雌雄蕊原基形成期至药隔期喷施 ,杀雄率能达 95%以上。药隔期为喷施临界期。品种、喷药剂量与喷药时期存在互作。②气候条件的改变对不同小麦品种生育进程的影响有差异。在杂交小麦制种中应对此加强研究 ,以利于花期调节。③在配制组合时 ,应特别注意抗性材料的选用。④超标优势明显的化杀杂种小麦 ,其优势主要表现在穗部性状上 ,尤其是穗粒数优势     

Covariate handling approaches in combination with dynamic borrowing for hybrid control studies

Borrowing data from external control has been an appealing strategy for evidence synthesis when conducting randomized controlled trials (RCTs). Often named hybrid control trials, they leverage existing control data from clinical trials or potentially real-world data (RWD), enable trial designs to allocate more patients to the novel intervention arm, and improve the efficiency or lower the cost of the primary RCT. Several methods have been established and developed to borrow external control data, among which the propensity score methods and Bayesian dynamic borrowing framework play essential roles. Noticing the unique strengths of propensity score methods and Bayesian hierarchical models, we utilize both methods in a complementary manner to analyze hybrid control studies. In this article, we review methods including covariate adjustments, propensity score matching and weighting in combination with dynamic borrowing and compare the performance of these methods through comprehensive simulations. Different degrees of covariate imbalance and confounding are examined. Our findings suggested that the conventional covariate adjustment in combination with the Bayesian commensurate prior model provides the highest power with good type I error control under the investigated settings. It has desired performance especially under scenarios of different degrees of confounding. To estimate efficacy signals in the exploratory setting, the covariate adjustment method in combination with the Bayesian commensurate prior is recommended.     

浅谈中国特色社会主义道路及对当今世界社会主义的启示

目前,世界社会主义运动依然处在苏东剧变以来的低谷,但在发端于美国并向全世界蔓延的资本主义金融危机的大背景下,社会主义以其独特的魅力再次吸引了人们的目光,社会主义思潮在全球范围内开始有所复兴。而中国特色社会主义道路的实践给当今世界社会主义以重大启示,它向人类表明社会主义是必由之路,社会主义优于资本主义。     

大学英语四、六级网络考试考场建设研究

大学英语四、六级网考项目开始于2007年,第一次四级网考试点工作实施于2008年12月。大学英语四、六级网考项目的建设目标,是提高大学英语四、六级考试的效度和考务管理效率。以2009年10月份的一次考试为例,描述CET-4大学英语网考考场内的硬件设置、环境设置、网考所需的软件、硬件配置和考试系统的操作流程,并且对网考中出现的问题进行剖析,有助于提出行之有效的改进方案。     

Urban growth in China: past, prospect, and its impacts

Rapid growth and globalization of the domestic economy have dramatically accelerated urbanization in China, resulting in significant environmental impacts and challenges for sustainable development. Using a multistate model accounting for distributional aspects of age, sex, education, and migration in rural and urban regions, we estimate the magnitude of urbanization in China through 2030 and examine some major associated sustainability issues. Results indicate that: (1) for a range of assumptions, China’s urban population will nearly double from 2000 to 2030; (2) the labor force will constitute a larger share of total population in urban areas than rural due to internal migration of younger workers—this appears particularly true for the mega-urban metropolises of Beijing and Shanghai; (3) rural populations will experience more aging than urban; and (4) level of education among China’s rural labor force will remain low, which could pressure China’s industrial structural transition from an agricultural to a service-based economy.     

俄罗斯境内的恐怖主义及其反恐策略研究——法律视角

俄罗斯的恐怖主义源于近代的"涅恰耶夫"现象,其产生有着深厚的理论基础。恐怖主义在当代俄罗斯社会的滥觞对其社会政治稳定、公民安全以及国家领土的完整造成严重威胁。俄罗斯当局在打击恐怖主义方面形成了较为完善的立法、行政、司法相结合的综合机制。发展国民经济、培育市民社会是当代俄罗斯根除恐怖主义的应然路径。