Exploring the propensity to perform social activities: a social network approach

Conceptual and empirical models of the propensity to perform social activity–travel behavior are described, which incorporate the influence of individuals’ social context, namely their social networks. More explicitly, the conceptual model develops the concepts of egocentric social networks, social activities, and social episodes, and defines the three sets of aspects that influence the propensity to perform social activities: individuals’ personal attributes, social network composition, and information and communication technology interaction with social network members. Using the structural equation modeling (SEM) technique and data recently collected in Toronto, the empirical model tests the effect of these three aspects on the propensity to perform social activities. Results suggest that the social networks framework provides useful insights into the role of physical space, social activity types, communication and information technology use, and the importance of “with whom” the activity was performed with. Overall, explicitly incorporating social networks into the activity–travel behavior modeling framework provides a promising framework to understand social activities and key aspects of the underlying behavioral process. Juan Antonio Carrasco a PhD candidate in Civil Engineering at the University of Toronto, holds a MSc degree in Transportation Engineering from the Pontificia Universidad Católica de Chile. His doctoral research explores the relationships between social networks, activity–travel behavior, and ICTs. His research interests also include microsimulation, land use-transportation, and econometric modeling. Eric J. Miller is Bahen-Tanenbaum Professor of Civil Engineering at the University of Toronto where he is also Director of the Joint Program in Transportation. His research interests include integrated land-use/transportation modeling, activity-based travel modeling, microsimulation and sustainable transportation planning.     

豚鼠化脓性中耳炎耳蜗柯蒂氏器扫描电镜观察

本实验以鼓泡接种金黄色葡萄球菌的方法诱发豚鼠的化胀性中耳炎,用扫描电镜观察接种细菌后1、2、4及6周不同时间豚鼠柯蒂氏器的病理改变,发现受试动物的耳蜗各回均可见不同程度的毛细胞静纤毛异常、细胞缺失及支持细胞的损伤等。另外,本实验还显示了外毛细胞消失及支持细胞指状突修复前后的一些表现。     

基于ActiveX技术构建B/S模式的交通视频监控系统

基于ActiveX技术构建了B/S模式的交通视频监控系统,采用先进的H.264视频压缩算法和流媒体技术,很好解决了视频图像停顿、延迟和抖动的现象,实现对远程摄像头和云台的控制,实现多方位监控,并且大大降低了客户端的管理和维修费用.     

浅议视频点播系统的关键技术

结合实际应用,主要介绍了视频点播系统(VOD)的网络支持环境、视频服务器和用户访问控制三项关键技术。     

TRANSFORMATION OF EFFUSION AND FORMATION OF GRANULATION TISSUE IN PATHOLOGIC PROCESS OF OTITIS MEDIA WITH EFFUSION

Exceptforinaminorityofthecaseswithearlystageotitismedia (OM)orsequelae ,effusionisthemostcommoninflammatoryproductamongthevar iousOMtype .Itisnotclearwhetheruntreatedef fusionresultsinchronic ,irreversible pathologicchangesinthemiddleearcleftandmastoid[1 -4 ] .Chronicotitismedia (COM)ismainlyindicatedbytheformationofgranulationtissue .Granulationtis sueisthemostcommon [5,6] andsignificantrepresenta tivepathologictissueofCOM .Studiesonthefac tors promoting granulationtissueformation ,thepat…     

豚鼠分泌性中耳炎动物模型建立的研究

目的　研究建立分泌性中耳炎豚鼠动物模型的方法 ,为渗出性中耳炎的动物实验研究提供一种有用的动物模型。方法　采用灭活的肺炎链球菌悬液制备豚鼠分泌性中耳炎动物模型 ,了解渗出性中耳炎对听阈及中耳炎黏膜的病理改变。结果　听阈升高者 16耳 ,以低频为主 ,鼓膜呈浅黄色 ,病理改变主要在中耳腔 ,有不同程度的渗出 ,以浆液性为主。结论　细菌的分解产物———内毒素 ,导致中耳黏膜的炎症反应及中耳腔渗出 ,为进一步研究SOM提供动物模型     

解读整合营销传播学

整合营销传播学崛起于20世纪90年代,是传播学的新发展。整合营销传传播学以消费者为受播对象、营销与传播彼此交融、营销传播手段相互整合、通过多种媒种传播。整合营销传播学为企业的营销传播提供了必要的理论框架。中国入世在即,了解并把握整合营销传播学对于提高我国企业的营销传播水平、深刻理解消费者的地位与作用,均将发挥作用。     

双流技术在高速公路视频监控系统中的应用研究

根据高速公路视频监控系统建设的需求,描述了双流技术的工作原理,对高速公路视频监控传输系统实际实施过程中发现的由双流技术引起的问题以及解决方法进行了介绍,为以后双流技术设计和应用的部署提供相应的指导。     

社会网络理论下开展订单式教育的信任机制研究

文章根据社会网络理论中社会资本理论和结构洞理论,分析了信任关系在订单式教育实施过程中的重大作用,并提出了如何构建信任机制的方法和途径,以期对高职院校开展＂订单式＂教育有所启示。     

The impacts of Internet use upon activity participation and travel: Results from a longitudinal diary-based panel study

At the outset of this research, two fields of transport research were in the ascendant. The first reflected technological change, considering the growth of new information and communications technologies and their impacts for transport systems and travel behaviour. The second reflected social change, considering the growth in inequality and disadvantage and the contribution of transport systems and travel behaviour to the same. This paper investigates a potential link between the two, exploring the hypothesis that virtual mobility, via the Internet, could provide a viable alternative to physical mobility in reducing mobility-related social exclusion. The paper presents data from a longitudinal, panel-based diary study. Results support the hypothesis that virtual mobility can provide a viable alternative to physical mobility in reducing aspects of mobility-related exclusion, by providing additional accessibility (virtual accessibility) without an increase in physical mobility. Furthermore, there is no evidence in this research to support a link between physical mobility and virtual mobility; and no evidence to suggest a negative effect of virtual mobility for sociability.