我国英语专业学生话语标记使用策略调查分析

话语标记语对话语的整体连贯和构建起着重要作用。运用大量的真实语料调查了我国学生口语话语标记的使用情况,并从定量、定性的角度分析比较高分组和低分组学生使用话语标记时存在的差异及导致这种结果的可能原因,将对二语学习者提高口语会话策略、口语教学和口语能力测评等提供一定的借鉴意义。     

时间之环——《解忧杂货店》的时间变形

《解忧杂货店》是日本当代推理小说家东野圭吾的一部非推理小说。在该作品中,作者非但没有制造凶杀案与寻找真相的紧张感,反而给读者带来满满的感动以及拼搏向上的正能量。东野圭吾的这部作品除了选材精妙之外,他通过灵活变换叙述时间是小说的叙事时间形成了一个封闭的圆环,从而使五个故事环环相扣,结构十分独特。笔者试图以时距为线索来分析这部作品的魅力。     

新媒体语境特征与用户态度关系构建的实证研究

通过对上海市民进行抽样调查,并使用结构方法模型对新媒体语境下的受众社会态度倾向进行实证研究,得出如下结论：新媒体语境通过社会懈怠对用户风险偏好和群体极化倾向产生正向影响,对责任与公平意识、道德发展以及亲社会倾向产生负向影响;媒体接触频率在新媒体与社会懈怠关系中具有显著正向调节作用,而媒体接触的多样性在其中的调节作用并不明显;在主效应和调节作用中,均表现出对男性的影响大于对女性的影响,其影响大小随着年龄的增加而呈减弱趋势。     

The development of students critical thinking abilities and dispositions through the concept mapping learning method – A meta-analysis

Our meta-analysis investigates the effectiveness of the concept mapping method compared with the traditional teaching method, for the improvement of critical thinking ability and disposition outcomes. We included studies measuring students' critical thinking through standardised tests, comparing an experimental (concept mapping) group with a control (traditional teaching) one. Effect sizes for critical thinking ability and disposition outcomes were pooled with a random-effects model. We included in our meta-analysis 21 studies (108 comparisons) involving 1695 students. The concept mapping method was more effective than the traditional teaching method at posttest for the improvement of critical thinking ability (g = 0.531, 95% CI 0.279 to 0.783) and disposition (g = 0.648, 95% CI 0.266 to 1.031). Heterogeneity was moderate to high, Egger's test did not indicate any evidence of publication bias; however, both visual inspection of the Funnel plot and Duval and Tweedie's trim and fill method indicated potentially three missing studies for critical thinking ability and two for critical thinking disposition. Additionally, we analysed the potential moderating effect of students' demographic characteristics, educational conditions, concept mapping elaboration methods and allocation type. Allocation type was a significant moderator, having a strong effect on concept mapping for critical thinking abilities in randomised studies (g = 0.739, 95% CI 0.356 to 1.122), but its effect is low in non-randomised studies (g = 0.265, 95% CI 0.014 to 0.517).     

基于网格部署的RFID阅读器失效预警算法研究

针对RFID阅读器网络中阅读器部署效率低、收敛慢等特征,提出了基于网格划分机制的静态RFID阅读器的部署方法,实现了二维平面结构和三维立体结构中阅读器的部署。并提出了当网络中RFID阅读器失效的距离向量失效预警算法。本文中提出的网格划分部署机制简单、高效、部署周期短,距离向量失效预警算法预警迅速、准确。     

一种收发不同频天线测试系统设计改造

本文介绍了一种带有非线性器件的射频通道天线的测试方法,针对这一种类型的天线系统,构建了一种收发不同频的天线测试系统。基于已有的室内天线远场测试系统,在不改变原有远场系统硬件配置以及软件系统的基础上,只添加一套对应的混频装置,就可完成对带有发射上变频与接收下变频通道的天线测量。系统的改造方案具有一定的通用性。在工程上对内置频率转换器件的这一类型天线方向图的精确测量具有一定的借鉴意义。     

基于语料库的大学生英语水平对自我修正影响的研究

研究拟探讨自我修正行为和英语学习者二语水平之间的关系.结果显示:学习者的二语水平对学习者自我修正行为有很大影响,高、低水平学习者在自我修正行为上的差异主要表现在自我修正的频率和类型上.     

Information resources estimation for accurate distribution-based concept drift detection

Machine learning applications must continually utilize label information from the data stream to detect concept drift and adapt to the dynamic behavior. Due to the computational expensiveness of label information, it is impractical to assume that the data stream is fully labeled. Therefore, much research focusing on semi-supervised concept drift detection has been proposed. Despite the large research effort in the literature, there is a lack of analysis on the information resources required with the achievable concept drift detection accuracy. Hence, this paper aims to answer the unexplored research question of “How many labeled samples are required to detect concept drift accurately?” by proposing an analytical framework to analyze and estimate the information resources required to detect concept drift accurately. Specifically, this paper disintegrates the distribution-based concept drift detection task into a learning task and a dissimilarity measurement task for independent analyses. The analyses results are then correlated to estimate the required number of labels within a set of data samples to detect concept drift accurately. The proximity of the information resources estimation is evaluated empirically, where the results suggest that the estimation is accurate with high amount of information resources provided. Additionally, estimation results of a state-of-the-art method and a benchmark data set are reported to show the applicability of the estimation by proposed analytical framework within benchmarked environments. In general, the estimation from the proposed analytical framework can serve as guidance in designing systems with limited information resources. This paper also hopes to assist in identifying research gaps and inspiring new research ideas regarding the analysis of the amount of information resources required for accurate concept drift detection.     

三菱可编程序控制器中高速计数器的研究与应用

本文就电气自动化领域广泛使用的可编程序控制器的高速计数器的应用作了详细的说明。由于高速计数器计数频率高,并能跳出可编程序控制器的循环扫描周期,在实际应用中使用价值很高。本文通过举例详细说明了高速计数器与编码器的匹配、最高频率的选取、相关指令与中断的组合运用。     

老年人运动行为、就诊次数与生命质量的关系

目的:了解老年人每周运动次数、就诊次数与生命质量的关系。方法:使用问卷调查法,针对65岁以上老年人,获得有效问卷898份,以描述性统计、T检验、单因子变异数分析等统计方法。结果:(1)每周运动5次以上的老年人在生理生命质量(PCS)及心理生命质量(MCS)得分较高,就诊次数较低。(2)与就诊次数相关的是运动次数、性别、年龄、是否参加健康检查、是否罹患慢性病、是否有工作,且达统计学意义。(3)老年人在75岁之后,在就诊次数有突然变差的现象,显示老化的程度在75岁是一个关键点。结论:每周运动3次的老年人,仅在心理生命质量(MCS)有较佳表现,而每周运动五次以上,则在生理生命质量(PCS)及心理生命质量(MCS)上都有较好的表现,同时在就诊次数上也较低,建议老年人采取"低强度、多次数"的运动方式,每周从事5次以上的运动,减少就诊次数,提高生命质量。