基于数字签名的用户认证方案

利用RSA算法及Feige—Fiat-Shamir数字签名协议构造了一种交互式用户认证方案，并且在此基础上实现了双向认证。该方案与只利用其中一种实现用户认证比较，增强了安全性，具有良好的应用价值和前景。     

The chaotic late Qing and early Republican periods

This article excavates some of the core intellectual elements underlying the Xinhai Revolution of 1911 and their historical genealogies. Rather than focusing on the modern nature of the revolution, Mizoguchi locates the revolution within the context of traditional Chinese culture and thought. A central focus of the article is the notion of “self-governance” (zizhi), which played a central role in determining the shape the revolution was to ultimately take. It analyzes the social thought of key figures of the Qing period, showing how in modified guise, core Confucian ethical concepts such as the dichotomy between the private (si) and public (gong) as well as utopian concepts such as datong (great harmony) determined the deep structure of revolutionary thought at the end of the Qing and into the Republican and Communist periods.     

他山之石,可以攻玉——从宫本武藏的《五轮书》看中国武术发展

对日本武术名著《五轮书》进行研究。研究认为:1)凡是武术就必须突出实战特点,并且要承认武术肯定具有一定程度的残酷性与危险性;2)在现代作为教育的武术,应多采用两人攻防形式练习,动作技术必须遵从战斗原则,求"简单"、"有效",即使是套路也应如此;3)武术在实战中须讲究战略与战术,应提倡"攻击、再攻击"的精神;4)武术的深层次理论须与人生的终极意义相结合,即通过技术练习进入哲学层次,以求得自然率直之心。这4点是值得中国武术借鉴的。     

The effects of attentional focus instructions on punching velocity and impact forces among trained combat athletes

Research indicates that instructing athlete’s to focus on bodily movements (internal focus of attention [IFA]) may hinder performance, whereas instructing them to focus on the movement outcome (external focus of attention [EFA]) often enhances performance. Despite the importance of instructions in striking combat sports, limited research has examined the influence of IFA and EFA on performance in well-trained combat athletes. This study investigated the effects of different instructional cues on punching velocity (m · s^?1) and normalised impact forces (N · kg^?1) among intermediate (n = 8) and expert (n = 7) competitive boxers and kickboxers. Athletes completed three rounds of 12 maximal effort punches delivered to a punching integrator on three separate days. Day one was a familiarisation session with only control instructions provided. In the following two days athletes randomly received IFA, EFA or control instructions prior to each of the three rounds. Athletes punching with EFA were 4% faster and 5% more forceful than IFA (P < 0.05), and 2% faster and 3% more forceful than control (P < 0.05). Furthermore, experts punched 11% faster and with 13% greater force compared with intermediate athletes (P < 0.05). EFA led to a positive effect on punching performance and should be favoured over IFA and control instructions.     

自习自研、师生互动教学策略在体育教学中的初步研究

本文通过对“自习自研、师生互动”教学策略的界定、特点和意义的探讨,明确了“自习自研”与“师生互动”的关系,从素质教育的角度全面认识自习自研、师生互动的意义,并在此基础上结合学生心理特点、体育学科特点和自己的教学实践,通过具体教学案例阐述了该策略在体育教学中的应用。     

游泳运动员技术和体能针对性训练初探

教练员们往往习惯于把训练分为水上训练和陆上训练,水上训练主要发展技术和专项训练水平,陆上训练的目的主要在于发展一般身体素质和大肌肉群的专项力量,而体能训练则常常被视为陆上训练的一个方面。近几年人们逐渐关注到体能训练在游泳训练中的地位和作用,通过对一些优秀运动员技术动作的测试分析发现,游进过程中推进力的增加和阻力的减小单靠发展大肌肉群的力量和核心力量是远远不够的,还必须注重发展与技术动作相关的小肌肉的力量,体能训练专项化已经成为现代游泳训练的一大特点。因为,高水平运动员存在着明显的个体差异,每一个人的情况千差万别,如何确定每一个运动员的技术现状,找出最需要发展的短板,将专项体能训练与技术训练结合起来进行针对性的练习是现代游泳训练的发展趋势,也是提高训练效果的重要环节。     

局部文本特征选取算法的比较和改进研究

本文通过实验比较了互信息、χ2统计算法和优势率三种算法在用于局部文本特征选取时对文本分类性能的影响.实验结果显示,在应用于局部特征选择的情况下,文本特征选取算法仍然可以将特征空间的维度降低90%以上,而不降低文本分类的性能.同时,我们发现在应用于局部文本特征选取时,优势率算法的性能不如互信息和χ2统计算法.另外,对于K最近邻分类算法,随着K值的增大,文本分类的查准率在增加,而查全率在降低.最后,本文详细分析了造成这三种算法性能差异的原因,并提出了一种改进算法,来提高优势率算法应用于局部文本特征选取时的性能.     

Registration Method for CT-MR Image Based on Mutual Information

Medical image registration is the process of finding ageometric transformation between two image-based coordi-nate systems that have the same patient-based coordinates ,i .e .the same anatomic locations .The registered multi-mo-dality images lead to impro…     

文质互变发展的顶峰与拐点——略论刘勰的文学发展观

在刘勰看来,以往文学发展的状态的变化,其实质都是因为文质互为量变而形成的递进和衰退。准确地说,他认为:在商周之前,是一个递进的过程,而从商周以后则是一段衰退的历史。那么,商周就成了实际意义上文质彬彬的顶峰。然而,文质无法达到绝对的平衡,商周的“丽而雅”已经开始显示出文进质退的趋势。所以,不可否认,商周实际上又成为文胜质的拐点。文学的发展,在商周之后,便逐步走上了“从质至讹,弥近弥澹”的道路。     

概率中容易混淆的概念对比

在概率统计学习中,有些基本概念容易混淆,给学生对该课程的学习带来许多不必要的麻烦,直接影响了学生的学习效果与教师的教学效果.为了帮助他们解决这一问题,特选几对这样的概念,从基本定义出发,通过例题进行辨析,并给出容易出现的错误、原因分析及正确的解答.