Effect of spatial distance on search information correlation in complex systems

Spatial distance has a remarkable effect on the attended mode of a network embedded in a certain space. First, we investigate how spatial restriction leads to information-information correlation that is strong, linear and positive in real networks. We then construct a two-dimensional space, define the action radius R for nodes of networks, and propose a class of models that depend on spatial distance. Information correlation of the models is consistent with that of real networks. The spatial distance plays a leading role in generating assortative mixing by degree, while the generation of disassortative mixing relies on both the degree of preferential attachment and spatial restriction.     

Effect of spatial distance on search information correlation in complex systems

Spatial distance has a remarkable effect on the attended mode of a network embedded in a certain space. First, we investigate how spatial restriction leads to information-information correlation that is strong, linear and positive in real networks. We then construct a two-dimensional space, define the action radius R for nodes of networks, and propose a class of models that depend on spatial distance. Information correlation of the models is consistent with that of real networks. The spatial distance plays ...     

一天内日地距离的比较

根据天文年历有关太阳参数，通过理论计算，发现日地距离的日变化具有一定规律：一天中正午太阳与观测者之间的距离，比日出日落两者间的距离，近的日期多于远的日期，两者的比率随着纬度的增加逐渐减小．     

一类特殊毛毛虫的多级距离数

研究了一类特殊的毛毛虫, 即除悬挂点外各点度数均相同的毛毛虫, 并得出了它的多级距离数.     

中长跑群体训练效应初探

通过实验、数理统计等研究方法,探讨群体训练在中长跑中的效果,结果表明:群体训练能提高运动员的心理和生理负荷能力,从而提高运动成绩.     

GIS中定性距离推理

为了丰富了GIS基础理论,运用区间运算理论和集合论,根据定性距离约束条件,导出了定性距离推理的通项公式,重点研究了同向定性距离推理和反向定性距离推理.只要定性距离的区间范围单调递增,推理结果与具体的区间比值无关.根据吸收律,定性推理结果与相邻定性距离的区间范围之比有关.该研究成果.     

扭转效应对空间结构抗震性能的影响

为研究扭转效应对空间结构抗震性能的影响,运用了规范规定的底部剪力法,以偏心距为变量,推导出单维地震作用下偏心距和层间侧移的关系式,并利用数值分析,说明了线弹性扭转角和层间侧移的变化特征。结果表明:减小空间结构体系的偏心距,可以有效地减弱扭转效应,提高结构体系的抗震性能。     

Early ERP effects on the scaling of spatial attention in visual search

This article describes the examination of the spatial‘scaling＇ effect of visual attention with the technique of event-related potential （ERP）. Eighteen participants were involved in a visual search task in which the cue-target paradigm was used. The search array was three concentric circles consisting of randomly selected English letters that were equally distributed in each circle. The behavioral and ERP data were recorded, respectively. The behavioral results showed that the response time increased and the response accuracy decreased with the increase of precue size. The ERPs amplitude of PI and NI components evoked by search array increased with the reduction of precue size. However, the latencies of these ERP components did not show significant differences between conditions. The hierarchical data of both behavioral assessment and ERPs provided evidence for the spatial ＇scaling＇ effect of visual attention. The amplitudes of PI and N 1 components may be used as indices to examine the effect of spatial ＇scaling＇. In different tasks, the display-set size of stimuli and the task complexity may be important factors that affect the attention allocation.     

主理想整环上对称矩阵的距离与对角化

设R是一个交换主理想整环(PID),A,B是两个R上的对称矩阵,讨论了A与B的算术距离与距离的关系,证明了A-B可合同对角化的充要条件是:A与B的距离等于它们的算术距离.     

具有Agent功能的远程教育系统的设计

介绍一个基于Web的智能化、个性化的远程教育系统的整体设计 .系统设计过程引入人工智能中Agent的思想 ,将学生、教师、教务人员、管理人员以及其他的教学资源有机地结合起来 ,为学生创造一个具有个性化、智能化的远程教育学习环境     

基于新型距离度量的多级编码在MQAM调制中的应用

基于在MLC／PDL系统中提出的一种新型距离度量，研究其在Rayleigh衰落信道下采用MQAM高效调制时的应用；提出了两种新的映射方法：BP-BP与UP-UP，并采用平衡距离准则作为最佳多级码的设计准则，得到了一种高性能、短时延、低复杂度的高效多级编码系统设计方案．     

基于Lucene的搜索引擎在远程教育平台中的实现

在现代远程教育平台上应用一个好的搜索引擎可以使用户高效的搜索到自己需要的资料．本文简要介绍了基于Java的全文检索包Lucene，然后介绍了为了对课件资源库中各种类型的文档进行搜索而基于Lucene开发的搜索引擎．     

分析化学仿真实验教学在远程教育中的实践与探索

随着时代的发展,一次性的学校教育越来越不能满足公民个人终身学习的社会需求。远程网络教育(简称远程教育)作为重要的再教育学习平台,越来越受到社会的重视。由于远程教育教与学之间时空分离的特点,给实验教学的开展带来困难。对分析化学仿真实验在远程教育中应用进行研究,旨在探索如何制作好符合远程教育特点的仿真实验,更好地满足远程教育实验教学发展的需要,为广大的自学者学习技能建立良好的学习平台。     

一类整数距离图的点荫度

整数距离图以全体整数作为顶点集,顶点u、υ相邻当且仅当｜u-υ｜∈D,其中D是一个正整数集．对于m〉3,令Dm=[1,m]／[1,3]．本研究得到了G（Dm）的点荫度．     

基于学的教学设计理论在现代远程教育中的应用

分析了现代远程教育的教学特点，论述了如何把“以学为中心”的教学设计理论应用到整个现代远程教育过程中。     

基于ASP.NET的远程教学平台的设计与实现

随着通信技术、网络技术和多媒体技术的不断发展,基于Web的远程教学系统蓬勃发展.如何最大限度地发挥"教师为中心"与"学生为中心"教学模式的各自长处,寻求设计一种教学平台能将两种教学模式有机地结合起来,形成一种教师与学生双向互动的新型教学模式是我们的研究重心.介绍了基于ASP.NET技术的远程教学系统中的远程考试和评价系统的设计及实现.     

Conflict adaptation in the perception of emotional valence in a Stroop task

Interference effects are commonly observed when conflicts arise between task-relevant and task-irrelevant dimensions of stimuli. Compared with responses to congruent trials in which the two dimensions are compatible, responses to incongruent trials are usually slower and less accurate. Moreover, the performance in a given trial is affected by the nature of the preceding trial, in that the interference effect for the current incongruent trial is reduced when it follows an incongruent trial than when it follows a congruent one. This conflict adaptation effect has been generally ascribed to the functioning of the cognitive control system, in which higher controls are recruited after conflicts to further constrain the processing of the task-irrelevant dimension. However, due to its uniqueness in neural and cognitive processes, whether the perception of emotional valence shows the same conflict adaptation effect in the conflicting context is an open question. This study adopted a variant of the Stroop task in which the task-relevant dimension was the affective facial expression while the task-irrelevant dimension was the meaning of an emotional word superimposed on the face. Results suggest that the perception of emotional valence in the conflicting context can have aspects that are both similar and dissimilar to the control of conflict for non-emotional information. The capturing of attention by emotional information can alter the functioning of the cognitive control system.     

对人日间距离的初探

讨论地球的公转轨道近似看做椭圆的情况下,处于地球公转轨道面内的地球上的人离开太阳的距离的变化情况。初步解决了“两小儿辩日”中所提出的问题。     

Conflict adaptation in the perception of emotional valence in a Stroop task

Interference effects are commonly observed when conflicts arise between task-relevant and task-irrelevant dimensions of stimuli. Compared with responses to congruent trials in which the two dimensions are compatible, responses to incongruent trials are usually slower and less accurate. Moreover, the performance in a given trial is affected by the nature of the preceding trial, in that the interference effect for the current incongruent trial is reduced when it follows an incongruent trial than when it follows a congruent one. This conflict adaptation effect has been generally ascribed to the functioning of the cognitive control system, in which higher controls are recruited after conflicts to further constrain the processing of the task-irrelevant dimension. However, due to its uniqueness in neural and cognitive processes, whether the perception of emotional valence shows the same conflict adaptation effect in the conflicting context is an open question. This study adopted a variant of the Stroop task in which the task-relevant dimension was the affective facial expression while the task-irrelevant dimension was the meaning of an emotional word superimposed on the face. Results suggest that the perception of emotional valence in the conflicting context can have aspects that are both similar and dissimilar to the control of conflict for non-emotional information. The capturing of attention by emotional information can alter the functioning of the cognitive control system.