混合模式数据分析P2P网络流量检测技术

P2P流量在对Intemet起巨大推动作用的同时,也带来了因资源过度占用而引起的网络拥塞以及安全隐患等问题,妨碍了正常的网络业务的开展。解决这些问题的基础,就是要有效地识别P2P流量。本文概述了主流P2P流量检测技术,分析各种检测技术的优缺点,提出了混合模式P2P流量检测方法,实验表明,该方法能够有效地检测P2P流量。     

基于网络的英语自主阅读互评模式研究

英语专业学生网络自主阅读互评模式结合现有成熟网络平台,针对英语错误僵化问题,以输入假说和输出假说为理论基础,引入错误分析方式,建立了基于网络的任务型阅读小组,将英语阅读、写作、评阅、修改、纠正、错误分析等一系列活动融为一体,进行为期一年的实验。通过分析实验结果,验证该模式可以用来消除和缓解语言错误僵化问题,对英语教学具有实践性意义。     

基于高阶累积量配准的网络异常流量识别算法

在大规模集成互联网络中,需要对网络流量进行异常检测和识别,以保障网络安全。利用高阶累积量对干扰的统计独立性,提出一种基于高阶累积量配准的网络异常流量识别算法。首先进行了网络异常流量的统计信号模型构建,分析了高阶累积量检测方法原理,然后采用自适应陷波器级联方法进行流量的干扰抑制和降噪分离,结合高阶累积量配准方法实现异常流量识别算法的改进。仿真实验表明,采用该算法进行网络流量异常识别,具有较好的幅频响应性能,提高了准确识别概率,检测性能优于传统算法。     

原电池演示实验改进研究

原电池实验是高中化学教材中的重点实验,也是高中化学的一个难点。实验时,往往会出现这些情况：将Cu片和Zn片插入稀H2SO4时,观察到Zn片上有大量气泡产生,而Cu片上几乎看不到气泡、电流表上没有读数等。这很容易使学生对原电池原理产生疑惑与误解。查阅资料,发现产生这种现象的原因有很多,但是最重要的原因有两个：电极发生电极极化作用和电极的纯度。     

基于六自由度模型的涡轮流量传感器被动式仿真方法（英文）

为了研究涡轮流量传感器的动态特性,根据其工作原理提出了基于六自由度模型和动态网格相结合的被动式仿真方法.该仿真方法通过编写用户自定义功能(UDF)程序来控制叶轮的6个自由度,使其只能在水流的冲击下旋转,实时计算叶轮转速,并可设定随时间变化的进口速度,以获得涡轮流量计的动态性能.基于该仿真方法对3种不同口径的涡轮流量传感器进行了仿真,并通过稳态实验和非稳态实验验证了该仿真方法的可靠性.结果表明,仿真得到的仪表系数随流量的变化趋势与实验结果接近,仿真结果与实验结果的偏差较小,最大偏差为2.88%.在非定常仿真研究中,叶轮转速随涡轮流量传感器入口速度的变化而变化,具有良好的跟随效果.被动式仿真方法可用于预测涡轮流量传感器的动态性能.     

现代网络实验模式研究与实践

首先讨论了21世纪教育需求的特点，并根据这些特点提出了利用网络进行实验教学的两种模式－仿真实验网络模式和具有实验室支撑的仿真实验网络模式。然后介绍了虚拟仿真实验室、装备数字化实验室和电子学网络实验室建设的基本设想和有关情况。     

基于网络语料库的大学生英语作文自我纠错模式

互联网上的英语语言文字构成了世界上最大的英语语料库.同时,网上免费网络协语器为学生提供了自我纠错的技术支撑.语言错误分析作为应用语言学中的一种理论和方法可以追溯到考德.语言错误是外语学习中不可逾越的鸿沟,而识别错误是纠错的前提.纠错模式包括识别错误和纠正错误两个步骤.这两步都须要依赖网络语料库.     

面向敏捷网络服务的SDN智能流量管理与优化

针对传统网络架构中流量拥塞和负载不均衡的问题,提出了一种基于软件定义网络（SDN）的智能流量管理与优化方法。该方法综合了一套精心设计的策略,包括流量分类与负载均衡、动态路径选择与优化以及服务质量保障等关键模块。实验验证是基于OpenFlow协议和Mininet模拟器进行的,结果显示,该方法在带宽利用率、延迟和丢包率等关键性能指标上具有显著优势,有效提升了网络服务的性能和可靠性。研究成果对于推动SDN技术在网络管理和优化方面的应用具有深远意义,不仅能够增强网络服务的自动化和可控性,也能够满足日益增长的敏捷网络服务的需求。     

一种基于TCP网络流量的多协议快速仿真方法

提出了一种新的网络仿真方法———基于TCP网络流量的多协议快速仿真方法。可以根据不同网络的差异模拟网络环境,来测试该网络的拓扑及频宽,以及测试网络协议的性能。提出了一些对TCP流量控制的算法,由实验证明可有效避免网络拥塞,并在仿真中加入新的功能,比较各种不同起始窗口大小对TCP效能的影响,发现在数据包丢失较少时,增大起始窗口大小对效能有正面的影响。     

谈谈英汉称谓习惯的不同及教学对策

本文探讨英汉两种语言在称谓上的不同习惯，分析中国学生在英语称谓表达中经常出现的几种语用错误，并提出了纠正这些错误的方法和途径。     

A low-power high-throughput link splitting router for NoCs

In this paper, we propose a technique for lowering the latency of the communication in a NoC （network on chip）. The technique, which can support two qualities of service （QoS）, i.e., the guaranteed throughput （GT） and best effort （BE）, is based on splitting a wider link into narrower links to increase throughput and decrease latency in the NoC. In addition, to ease the synchronization and reduce the crosstalk, we use the l-of-4 encoding for the smaller buses. The use of the encoding in the proposed NoC architecture considerably lowers the latency for both BE and GT packets. In addition, the bandwidth is increased while the power consumption of the links is reduced.     

吐蕃时期周边交通研究综述

吐蕃周边交通的研究由于文献资料的缺乏,向来没有比较系统的研究,而且研究内容主要以“唐蕃古道”为主。笔者对古今吐蕃周边交通方面的资料作了一个全面的梳理,对吐蕃周边的交通进行了重新认识,并希望以后对吐蕃周边交通的研究能够打破单一的“唐蕃古道”研究,而在吐蕃通往西域的道路、吐蕃通往南蛮的道路、吐蕃通往印度的道路、吐蕃通往中亚的道路都有系统性的研究,从而对吐蕃王朝时期的交通和文化有个全面的认识。     

仿生优化算法在片上网络映射的应用研究

片上系统发展到片上网络阶段,能耗问题已经成为片上网络技术的重要约束。在片上网络映射中应用了生物仿生算法—蚁群优化算法使系统能耗达到优化,实验表明蚁群优化算法运用较好的局部搜索算法可以很快地收敛,针对不同的应用,可以减少15%-40%的通讯能耗。     

Effects of teacher feedback behavior on social acceptance in inclusive elementary classrooms: Exploring social referencing processes in a natural setting

Teacher feedback behavior is a key determinant of the social referencing processes that influence the social acceptance of pupils. The present longitudinal study explores how teacher feedback on academic performance and social behavior is related to social acceptance during classroom activities and recess in the natural setting of inclusive classrooms. Data come from a study with 32 teachers and their 546 first to third grade pupils in Switzerland. Teacher feedback behavior was videotaped and peer nominations and ratings were used to assess social acceptance. Multilevel regression analyses showed that feedback on incorrect social behavior was negatively correlated with feedback on correct academic performance. Teacher feedback on incorrect social behavior and on correct and incorrect academic performance predicted how pupils were accepted by their peers during classroom activities. However, teacher feedback did not affect social acceptance during recess. The effect of teacher feedback behavior on social acceptance appears to depend on context. Social acceptance during classroom activities is influenced by teacher feedback whereas social acceptance at recess is not.     

重庆市大学生个人消费现状研究

大学校园中出现的奢侈消费、虚荣消费、超前消费、恋爱消费等现象应该引起足够注意,这些不良消费行为折射出当代大学生不正确的价值观、金钱观和人生观,其负面影响不容忽视.本文从重庆几所高校大学生的消费现状出发,分析了其中存在的问题,并提出了一些解决的办法.希望能对当前大学生个人消费问题的研究提供一些启示和思考.     

Enhancing Force Concept Inventory diagnostics to identify dominant misconceptions in first-year engineering physics

This work presents the results of a study whose aim is to detect systematic errors about the concept of force among freshmen students. The researchers analysed the results of the Force Concept Inventory test, which was administered to two different groups of students. The results show that, although there were significant performance variations between the two groups, they, nonetheless, shared common incorrect answers that were consistently triggered by the same misconceptions. The analysis proposed in this paper could also be applied in other universities to reveal the students’ a priori mindset in Newtonian mechanics and serve as a guideline for developing effective computer simulations or other tools.     

Interpreting histograms. As easy as it seems?

Histograms are widely used, but recent studies have shown that they are not as easy to interpret as it might seem. In this article, we report on three studies on the interpretation of histograms in which we investigated, namely, (1) whether the misinterpretation by university students can be considered to be the result of heuristic reasoning, (2) whether we could influence performance by stimulating or hindering the analytic processing of histograms, and (3) whether experts still show signs of this heuristic misinterpretation. We found that both university students and experts show signs of incorrect heuristic reasoning when comparing the mean of two data sets presented by histograms. Stimulating or hindering analytic processing did not affect performance. These indications of heuristic reasoning and the impossibility to affect this analytic processing suggest that the incorrect heuristic misinterpretation of histograms is very persistent. Implications for theory and methodology, scientific and educational practice are discussed.     

The Impact of Process Instructions on Judges’ Use of Examinee Performance Data in Angoff Standard Setting Exercises

Despite being widely used and frequently studied, the Angoff standard setting procedure has received little attention with respect to an integral part of the process: how judges incorporate examinee performance data in the decision‐making process. Without performance data, subject matter experts have considerable difficulty accurately making the required judgments. Providing data introduces the very real possibility that judges will turn their content‐based judgments into norm‐referenced judgments. This article reports on three Angoff standard setting panels for which some items were randomly assigned to have incorrect performance data. Judges were informed that some of the items were accompanied by inaccurate data, but were not told which items they were. The purpose of the manipulation was to assess the extent to which changing the instructions given to the judges would impact the extent to which they relied on the performance data. The modified instructions resulted in the judges making less use of the performance data than judges participating in recent parallel studies. The relative extent of the change judges made did not appear to be substantially influenced by the accuracy of the data.     

“Authentic Tasks” and “Extreme Tasks”: Potential Approaches to Overcoming Incorrect Responses in Conservation Tasks

This study begins the task of mapping out two approaches that may be helpful in overcoming incorrect responses to conservation tasks, focusing on the non-conserved quantity. The incorrect responses, which were the result of over-generalizations of conservation, and gradually increased with age despite formal knowledge and minor perceptual input, were explained as being consistent with the intuitive rule “same A–same B.” The following paper presents initial findings, involving 60 students (5th, 7th, 9th grade), who were presented with “authentic tasks” and 40 9th grade students who were presented with “extreme tasks.” As data show, in both “authentic tasks” and extreme tasks, the percentage of participants’ correct responses was higher compared to students’ responses to formal analogue tasks, although there was no difference in participants’ declarative judgments. Indeed, further research is needed to improve students’ responses and judgments not only in analogous and everyday tasks but also on how learning tasks can be designed, and to understand the observed gap between the students’ performance and their declarative knowledge.     

一维装箱问题的交叉算法分析

2004年孙春玲等研究了一维装箱问题,给出了一个近似程度最好的近似值为3/2的近似算法-交叉算法.遗憾的是他们的交叉算法的近似值分析是错误的,本文通过两个反例说明了他们的错误所在,并给出一个正确的近似值分析.