基于DSPF2812的发动机转速测量系统设计

在研究现有的几种发动机转速测量方法基础上,设计了一种以T型测速方法为原理,以DSPF2812为控制核心的发动机转速测量系统。给出了系统的测量原理以及实现发动机转速测量的软件编程方法和信号调理电路设计,同时应用LabVIEW软件实现对信号的监测和数据存储,最后对该测量系统进行了实验测试,在实际测试中取得了良好的效果。该系统具有测速精度高、测速范围广以及实时性强等特点,为汽车发动机性能研究、故障处理以及后续的分析提供了重要的参考依据,同时该系统还可以应用到电机测速等其它测速领域,具有较高的实用价值。     

论挫折教育在大学生生命教育中的重要地位及其实现途径

大学生挫折教育不仅是十分必要的,而且应该成为大学生生命教育的核心内容。挫折教育的目的在于引导大学生以坚强的意志和平常心对待各种挫折;志存高远,胸怀天下,坚信每个人都能为社会做贡献;以乐观心态看待就业问题;相信每个人都有无限的潜能。为此,高校要通过开展革命烈士、英雄事迹的宣传教育活动,培养大学生的爱国主义情怀;组织大学生参加各种社会公益活动,培养大学生的奉献精神;倡导人生而平等,不以职业高低分贵贱,培养大学生的生命平等意识;让大学生参加各种各样的劳动,培养他们的艰苦奋斗精神,提高大学生的抗挫折能力。     

论资源意识下体育参与对青少年的 积极发展效用

体育运动作为青少年广泛参与的一种活动形式,对积极青少年发展的促进作用受到研究者的广泛认同,然而,体育参与在青少年发展中的消极作用却也不容忽视。作为积极青少年发展研究的一个重要取向和领域,人类积极发展的资源模型提出发展资源的累积可以帮助实现积极青少年发展。因此,在体育参与情境中通过外部资源的创设与内部资源的培育实现青少年发展资源的累积,是体育参与促进青少年积极发展的必由之路。     

论苗族歌鼟的艺术美

苗族歌鼟是湖南湘西南部靖州苗族侗族自治县锹里一带流传的多声部民歌,其旋律优美,声部和谐,唱腔独特,具有自然朴实的民族特色,给人以美的享受。这种艺术美渗透于苗族歌鼟的各个构成元素,非常注重旋律、节奏、和声、调式的美感;歌词体现出苗民们的内在美;唱腔充分发挥出演唱的声韵美;语言更是彰显了民族之本色。这些艺术美的元素综合在一起,使苗族歌鼟成为一种美的化身。     

田园城市建设中成都市公共体育服务体系构建与运行机制研究

公共体育服务作为基本公共服务的重要内容,在构建公共服务体系中占有举足轻重的地位.运用实地考察、制度分析、理论建构等研究方法,对成都市在建设现代田园城市进程中的公共体育服务现状进行调研.研究发现,建设公共体育服务体系是现代田园城市发展的重要内容,现实运行中存在公共体育服务法规文本不完善、体育供给有限、体育组织不健全、体育需求多元化得不到满足等现实问题.研究表明,影响成都公共体育服务的主要因素在于:专业性与专门性的公共体育服务法规文本出台跟进不力;体育供给与需求匹配不足;政府与体育社团组织功能双向发挥不到位.研究建议:明确政府公共体育服务职责;激活社会体育组织参与公共体育服务职能;建立完善的公共体育财政保障机制;构建多元化公共体育服务供给机制.     

Subgroup Analysis with Time‐to‐Event Data Under a Logistic‐Cox Mixture Model

Subgroup detection has received increasing attention recently in different fields such as clinical trials, public management and market segmentation analysis. In these fields, people often face time‐to‐event data, which are commonly subject to right censoring. This paper proposes a semiparametric Logistic‐Cox mixture model for subgroup analysis when the interested outcome is event time with right censoring. The proposed method mainly consists of a likelihood ratio‐based testing procedure for testing the existence of subgroups. The expectation–maximization iteration is applied to improve the testing power, and a model‐based bootstrap approach is developed to implement the testing procedure. When there exist subgroups, one can also use the proposed model to estimate the subgroup effect and construct predictive scores for the subgroup membership. The large sample properties of the proposed method are studied. The finite sample performance of the proposed method is assessed by simulation studies. A real data example is also provided for illustration.     

Understanding Estimators of Treatment Effects in Regression Discontinuity Designs

In this paper, we propose two new estimators of treatment effects in regression discontinuity designs. These estimators can aid understanding of the existing estimators such as the local polynomial estimator and the partially linear estimator. The first estimator is the partially polynomial estimator which extends the partially linear estimator by further incorporating derivative differences of the conditional mean of the outcome on the two sides of the discontinuity point. This estimator is related to the local polynomial estimator by a relocalization effect. Unlike the partially linear estimator, this estimator can achieve the optimal rate of convergence even under broader regularity conditions. The second estimator is an instrumental variable estimator in the fuzzy design. This estimator will reduce to the local polynomial estimator if higher order endogeneities are neglected. We study the asymptotic properties of these two estimators and conduct simulation studies to confirm the theoretical analysis.     

Computing the log concave NPMLE for interval censored data

In analyzing interval censored data, a non-parametric estimator is often desired due to difficulties in assessing model fits. Because of this, the non-parametric maximum likelihood estimator (NPMLE) is often the default estimator. However, the estimates for values of interest of the survival function, such as the quantiles, have very large standard errors due to the jagged form of the estimator. By forcing the estimator to be constrained to the class of log concave functions, the estimator is ensured to have a smooth survival estimate which has much better operating characteristics than the unconstrained NPMLE, without needing to specify a parametric family or smoothing parameter. In this paper, we first prove that the likelihood can be maximized under a finite set of parameters under mild conditions, although the log likelihood function is not strictly concave. We then present an efficient algorithm for computing a local maximum of the likelihood function. Using our fast new algorithm, we present evidence from simulated current status data suggesting that the rate of convergence of the log-concave estimator is faster (between \(n^{2/5}\) and \(n^{1/2}\)) than the unconstrained NPMLE (between \(n^{1/3}\) and \(n^{1/2}\)).     

行业协会对行政权力制约的缺乏及对策

任何公权力都需要监督和制约,行政权力尤为如此.行业协会不同于一般的社会组织,它的出现是对传统国家管理的修正,是社会发展的必然,是对行政权力进行制约的有效武器.但是,我国行业协会的发展却不尽如人意.文章从我国行业协会的历史和现状两方面分析了我国目前行业协会对行政权力缺乏制约的原因,并提出了相关解决的对策.