Internet网络特征量分析

形式化定义、量化分析了Internet网络的特征量,给出Internet网络空间和时间效能的一般性定义,定义两种效能的特征参量——网络密度和Internet网络访问直径,量化分析近5 000万条来自CAIDA的Internet测量数据样本,证明网络密度和访问直径之间的数学关系,形式化定义Internet网络效能因子,并将Internet网络的时间和空间效能联系起来,实现对网络效能的综合评判。网络效能因子基于时间维演化的数学模型有助于预测和评价Internet的发展状况。     

基于复杂网络的Internet结构模型

在Internet网络的演化过程中,新增节点进行服务器选择时,不但要考虑网络的流量和带宽,而且还要考虑与服务器的距离.基于Internet网络中选择服务器的条件,建立了一个Internet网络结构演化模型.在网络模型中,把Internet网络流量作为链路的权重、节点的服务量能力作为节点强度、节点的连接负载作为连接度.应用数值分析方法,研究了网络的动态演化规律和节点强度的概率分布特性.研究结果表明,新模型的强度分布服从幂律分布,而且该模型是一个更一般化的BBV加权网络模型.     

Internet网络的访问直径分析

结合复杂网络理论与CAIDA授权的关于Internet网络的真实海量数据,从复杂网络理论角度对真实的Internet数据进行分析与研究.首先借助物理学和生物学研究的方法,将Internet网络视为具有生命涨落特征的活体系统,形式化定义了Internet物理特征量--访问直径.然后根据目标复杂系统涨落演化特点,提出了3种基于Logistic模型的、以带衰减因子的正余弦函数组合模拟振荡涨落的数学模型.使用浮点型遗传算法分别进行拟合实验,并通过实验结果对上述3种模型进行优选.最终优选模型的拟合准确度为97.87%,预测准确度为97.47%,准确度高,符合Internet网络真实数据变化情况.文中使用模型对较远未来网络情况进行了预测,并得出结论：从现在开始至2011年12月,将是Internet网络高速发展时期,之后发展速度变缓,并于2021年10月左右趋于稳定,此时Internet网络访问直径为10.2073跳.最后,应用文中模型重点预测出了2008年8月北京奥运期间Internet网络访问直径为10.7726跳,并得出奥运期间Internet网络效率较高的结论.     

一种基于方程的多媒体实时流拥塞控制机制

1 引言端到端拥塞控制机制对Internet的鲁棒性和稳定性至关重要。目前Internet上许多应用使用基于窗口的拥塞控制算法对网络拥塞进行响应和避免网络崩溃。可以说,今天Internet的成功很大程度上得益于TCP拥塞控制算法的不断改进。     

基于Internt的《离散数学》网络辅助教学系统及试题库的设计和实现

介绍了基于Internet设计和实现的离散数学网络辅助教学系统及离散数学网络试题库系统。为网络教学提供了实例。     

基于对端重叠网络的通用大规模计算资源共享环境的构造

大规模计算资源共享是网格计算和其它基于Internet的计算模式的首要目标之一 .作为计算网格的一个主要分支 ,自愿计算环境在大规模计算模式中正在扮演着越来越重要的角色 .目前的自愿计算环境大多是专用和集中控制的 ,因而存在着某些可用性和可扩展性的问题 .该文构造了一个通用和可扩展的自愿计算环境 :Paradrop per .该环境的可扩展性得益于一个自组织的对端重叠网络 ( peer to peeroverlaynetwork) ;通用性得益于统一的计算和任务描述手段以及建立在该网络之上的计算任务调度、容错机制和界面友好的使用平台 .该文首先对自愿计算的特点以及Paradropper计算平台做了简要介绍 ,然后重点阐述该环境下计算网络的构造和基于该网络的计算任务调度算法 ,对计算网络的若干特性 (诸如高聚合性和低搜索路径 )以及调度的效能进行了仿真分析 ,最后 ,通过若干示例应用对计算平台的功能进行了测试 .仿真结果说明 ,该文构造的计算网络表现出明显的自组织特性 ,具有较好的可扩展性和自组织能力 ,能为计算资源的调度提供很好的支持 .小规模测试结果初步说明 ,该文构造的计算环境为Internet环境下的单程序多数据 (SPMD)的易并行计算应用提供了一个可行的思路 .     

基于Internet／Intranet的多媒体远程教学系统的设计与实现

基本介绍了国防科技大学一个基于Internet/Intranet的多媒体远程教学系统的设计与;实现及其相关技术,并提出XML和Internet上的虚拟现实技术将是未来的基于计算机网络的远程教学发展方向。     

基于Internet的网络校园研究

文中根据Internet网络服务的时空距越特性,设计并实现了一个以Internet网络技术为基础和环境的虚拟网络中学校园系统框架（FVMS）。以虚拟网络中学校园系统框架为基础建立的网络校园教育系统不仅能够克服传统中学教学资源在时间和空间分布适应上的局限性,而且在网络教学方式和教学协作方面比传统的远程网络教育系统有着更好的针对性和灵活性。     

基于移动IPv6的Ad Hoc网络Internet接入方法

通过对移动IP协议与移动Ad Hoc网络的研究,提出了一种基于移动IPv6的Ad Hoc网络Internet接入方法MaMv6.将移动IP技术同移动Ad Hoc网络结合起来,既能使移动结点在移动过程中保持与Internet的连接,又能利用移动Ad Hoc网络的多跳特性来扩展接入点范围,提供了一种在IPv6背景下、在全局范围内实现移动性Intemet连接的可能.     

基于Internet的远程控制网络

阐述了现场总线的特点和基于Internet的远程控制的基本概念、系统的实现系统。重点论述了基于LonWorks现场总线技术的控制系统EIC2000的软硬件组成,如何通过Internet从现场控制网络中获取实时数据并将它嵌入HTML文件中。     

The Internet knowledge (iKnow) measure

Despite increasing development and administration of Internet surveys, tests, and many other applications to be used by employees and the general public, little is known about the knowledge individuals bring to Internet tasks. This research improves our understanding of the concept of Internet knowledge, and provides initial support for the construct validity of a new measure of Internet knowledge with respect to its factor structure, internal consistency reliability, and concurrent validity. From a practical perspective, clearer definition of Internet knowledge and the availability of a reliable measure of such knowledge can advance our understanding of how individuals develop Internet experience through its use and may also inform the process by which web sites and Internet applications are designed.     

Sophistication of Internet usage (SIU) and its attitudinal antecedents: An empirical study in Hong Kong

The measurement of Internet use in empirical studies has undergone a progression from uni-item measurement to multi-item measurement. Based on several operationalizations of Internet use in existing studies, the paper proposes a reflective measurement model, called ‘sophistication of Internet usage’ (SIU), with five indicators (online time, online activities, online skills, diversity of online method, and diversity of online places). With data from a longitudinal random survey conducted in Hong Kong from 2003 to 2005, a uni-dimension measurement model is established based on confirmatory factor analysis. Convergent and discriminant validity of the uni-dimension model is also established within multi-trait-multi-method (MTMM) paradigm by confirmatory factor analysis. The model shows that individuals’ positive life outcome expectation, expected ease of use, and perceived popularity of the Internet are significant antecedents of SIU with demographic characteristics controlled.     

基于互联网思维的高职数学建模教学策略研究

数学建模是将现实生活的实际问题用数学模型来解决的过程,对于高职高专学生来说更具吸引力。如果在教学中积极融入互联网思维,充分利用互联网工具、引入互联网案例,将会使高职数学建模课程更利于学生接受理解。在“互联网+”的大背景下,将高职数学建模课程与互联网技术相结合进行基于互联网思维的教学改革即符合时代发展需要,也符合当前与今后人们的学习习惯。因此当前必须积极探索与尝试基于互联网思维的高级数学建模教学改革。文章在分析了时代背景的基础上,提出基于互联网思维的高职数学建模教学改革的必要性。进一步研究了改革内容,即:运用基于互联网的教学手段、引入基于互联网内容的教学案例、开展线上社团、运用基于互联网的评价策略。     

Development and validation of an internet use attitude scale

This paper describes the development and validation of a new 40-item Internet Attitude Scale (IAS), a one-dimensional inventory for measuring the Internet attitudes. The first experiment initiated a generic Internet attitude questionnaire, ensured construct validity, and examined factorial validity and reliability. The second experiment further analyzed the results of the first experiment to verify criterion validity and reliability using a different sample group. The results of the first and second experiments illustrated that this newly Internet Attitude Scale is a valid and reliable instrument for measuring Internet attitudes.     

Validation and psychometric properties of a short version of Young’s Internet Addiction Test

A key element of research on Internet addiction is a valid and reliable assessment of problems individuals experience in their daily life due to an excessive or pathological use of the Internet. One of the most frequently used questionnaires is Young’s Internet Addiction Test (IAT). However, the factorial structure of the IAT is still discussed controversially. In four studies with different samples we (a) addressed the factorial structure of the IAT with exploratory factor analysis and reduced the items to those with sufficient factor loadings and good item characteristics, (b) checked the factorial structure using confirmatory factor analysis, and (c) analyzed convergent, divergent and incremental validities. We revealed a short version of the IAT, which consists of 12 items and a two-factorial solution with good reliability (study 1). The two factors were named “loss of control/time management” and “craving/social problems”. This two-factorial solution was confirmed by the confirmatory factor analysis (study 2) and we have found good indices for convergent, divergent and incremental validity (studies 3 and 4). In conclusion, the short version of the IAT has good psychometric properties and represents the Internet addiction’s key elements based on the proposed diagnostic criteria.     

Factor structure for Young’s Internet Addiction Test: A confirmatory study

A number of diagnostic scales have been developed in recent years to assess Internet addiction. To better understand the structure, validity, and reliability of such assessment instruments, Young’s Internet Addiction Test (IAT) was evaluated using a confirmatory approach.Data collected through a survey of 410 Hong Kong university undergraduates was subjected to exploratory factor analysis and data from a hold-out sample was analyzed using confirmatory factor analysis in order to assess the psychometric properties and factor structure of the IAT scale. Three dimensions, namely, “Withdrawal and Social Problems”, “Time Management and Performance”, and “Reality Substitute” were extracted.These dimensions were then correlated with a number of criterion variables, including academic performance, online activities, gender, and Internet usage. The results show that academic performance was negatively correlated with the Internet addiction scores. The degree of Internet addiction was also found to vary across different types of online activity, with people engaged in cyberrelationships and online gambling having higher Internet addiction scores.     

Factorial validity of problematic Internet use scales

There exists a number of multidimensional measurement scales for problematic Internet use (PIU) with varying factor structures. This study reviews the factor analytic techniques used to develop these measures and discusses their implications for the factorial validity, particularly discriminant validity, of these PIU scales. To further illustrate these points, we reformulate the four-factor Online Cognition Scale into a more parsimonious two-factor measure (i.e., dependency and distraction) and demonstrate its factorial validity as well as robustness across student and working adult samples. Contributions of this research are discussed.     

Internet Abusive Use Questionnaire: Psychometric properties

Regardless of the different theoretical positions held at present, we can probably agree that an abusive and problematic use of the Internet exists. We present an instrumental study whose objective is to develop a brief, valid, and reliable questionnaire to measure this abuse in epidemiological contexts. The Internet Abusive Use Questionnaire (IAUQ) consists of 12 items to respond to according to the Likert scale. A total of 908 respondents participated, 48% males, with ages ranging between 17 and 70 years. The IAUQ showed a single factor structure. This model presents a good adjustment, with CFI, GFI, and NFI fit index over .90. Internal consistency was found to be .90. The IAUQ showed direct correlations with the Internet abusive use self-assessment, anxiety and depression, and inverse correlations with quality of life. All correlations were significant (p < .001), which demonstrated convergent validity. Significant differences were also found in the IAUQ scores among groups with different age, cultural level, and other addictions, which evidenced discriminant validity. In conclusion, the obtained results demonstrate structural validity and adequate indices of convergent validity and discriminative capacity. These psychometric characteristics —combined with the fact that the IAUQ evaluates harmful use of Internet briefly and simply— fulfill our goal.     

Psychometric properties of the Problematic Internet Use Questionnaire

Several instruments have been designed to measure problems associated with excessive, compulsive, or addictive use of the Internet. One such instrument, the 18-item Problematic Internet Use Questionnaire, was recently published with data supporting a three subscale model (Demetrovics et al., 2008). These researches utilized an online format with a sample taken from the general population of Hungary. We utilized an American college student sample and a paper and pencil format to perform a confirmatory factor analysis of the PIUQ. In addition, we examined the reliability and construct validity of the PIUQ by examining the scales’ relationship with several indices of psychological and physical health. CFA results indicate a barely adequate and not completely problem free three factor model for the PIUQ (χ² = 477.40; root mean square error = .097; comparative fit index = .831; Tucker Lewis coefficient = .804). Cronbach’s α for the total scale was .91 while the Cronbach’s α for each subscale were .81, .77, and .79. Construct validity for the model is demonstrated with significant correlations between the subscales and several indices of psychological and physical health. Suggestions for further research are provided.