Modes of making smart cities: Or,practices of variegated smart urbanism

The ‘actually existing’ smart city is not a monolith. It is not directed by a universal logic, nor does it develop in a standardised way. As recent research has argued, the spatial, material, and political contexts of cities have major influence over what smart urbanism looks like in practice. This paper adds analytical depth to, and broadens the geographical scope of, research on the variegated modes of making smart cities. Based on empirical research in multiple Australian cities we use three case studies to explore three different modes of smart urbanism, each one centred on the interests of a different key actor: corporate-centric, citizen-centric, and planner-centric. These different modes can, and do, co-exist in the same city. At times, they are competing logics that fight to pull the city in different directions. Yet, they can also work together to shape smart city initiatives. In describing these different modes, we pay particular attention to the ways that these projects and strategies must contend with the already existing spatial, cultural, and political contexts of each place.     

Understanding Why Scholars Hold Different Views on the Influences of Video Games on Public Health

Despite decades of research, no scholarly consensus has been achieved regarding the potential impact of video games on youth aggression or other public health concerns. In recent years, hypotheses have been raised that scholarly opinions on video games may resemble past moral panics, with attitudes reflective of generational conflicts. These hypotheses are tested in a sample of 175 criminologists, psychologists, and media scholars, examining both overall negative attitudes about video games and perceived linkages with youth assaults specifically. Results reflected continued lack of scholarly consensus on the issue of video game influences with only 15.3% of scholars endorsing the view that violent video games contribute to youth assaults. As hypothesized, older scholars endorsed more negative views of video games generally, although this appeared to be related to experience with games rather than age per se. Scholars with more negative attitudes toward youth themselves were also more negative about games. Criminologists and media scholars were more skeptical of violent video games contributing to youth assaults than were psychologists. These results are discussed in relation to Moral Panic Theory.     

Securing Threshold Cryptosystems against Chosen Ciphertext Attack

For the most compelling applications of threshold cryptosystems, security against chosen cipher text attack is a requirement. However, prior to the results presented here, there appeared to be no practical threshold cryptosystems in the literature that were provably chosen ciphertext secure, even in the idealized random oracle model. The contribution of this paper is to present two very practical threshold cryptosystems, and to prove that they are secure against chosen ciphertext attack in the random oracle model. Not only are these protocols computationally very efficient, but they are also non-interactive, which means they can be easily run over an asynchronous communication network. Received November 2000 and revised September 2001 Online publication 11 March 2002     

PTN组网模型及网络规划浅析

本文针对目前PTN大规模组网中遇到的业务开放模式及网络规划问题,提出几种组网方案进行探讨和技术分析。     

基于时空感知的用户角色推理

随着大数据和信息技术的发展,更好地理解用户的行为轨迹在个性化推荐、广告推荐等方面越来越重要。该文依据大数据环境下的城市计算理论,提出一种基于情境感知的用户角色推理模型。通过用户的行为轨迹分析其行为的时空特性;结合时间、语义分析等构造识别用户角色概率推理模型;通过算法克服识别用户角色的主观性、动态适应性差等问题。实验结果证明了该文所提模型的可行性、精确性和预测准确性。     

基于UDP的室内无线接收DVB方案研究

随着智能移动设备的广泛普及,家庭用户逐渐渴望能够在智能终端上收看数字电视节目。由于传统家庭内部的机顶盒只能提供有线数字电视信号,因此本文研究了一种基于UDP协议的室内无线接收DVB-C信号的方法,并分析了MPEG-2 TS的相关原理及室内无线传输损耗,在此基础上讨论了方案的可行性。     

PTN技术在本地传输网中的应用探讨

简要介绍了PTN核心技术与应用现状,较详细地论述了本地传输网采用PTN技术的必要性;结合某地区本地传输网PTN规划实际,提出了PTN技术的3种组网模式,以及PTN独立组网和PTN＋OTN联合组网2种方案,并对其进行了详细分析。     

数字电视传输流的实时码率变换系统

数字视频压缩后通常是打包成传输流的形式进行传送，年个传输流有其固定的发送码率，在某些应用场合，比如信道调制前端，需要对输入传输流码率进行改变以适应该信道要求，描述了一种全硬件实现，双路输出，实时，节目可选择的码率变换系统的原理及具体实现。     

基于面积特征的城区航空影像匹配方法

基于特征的影像匹配是一类极为广泛和重要的方法。已有的研究体现出了特征对于实施最为匹配的影像之一－－城区航空影像有着极为明显的优越性。文中给出一种新的匹配目标函数的构建，并基于此提出一种城区航空影像匹配算法，给出了算法的实现过程，并以部分东京城区图进行了试验，结果表明文中的方法具有乘法明了，可靠易行和抗旋转性的优点。     

最小生成树算法在城市基础建设中的应用

随着城市基础建设规模的逐步扩大,所需建设资金也大幅提高,只有对各类系统进一步优化才能提高其运行的经济效益和利用率,降低其成本。本文采用最小生成树算法对城市基础建设布局进行设计,重点以暖气供应为例进行阐述。