城市轨道交通网络化运营条件下车辆基地的资源共享研究

随着国内城市轨道交通建设的快速发展与网络化运营的需求,车辆基地的资源共享研究受到日益广泛的关注与重视.该文旨在从线网车辆运用及维修角度对整个线网车辆基地进行分析研究,探讨相关各专业各种资源的共享、合理取舍和确定各车辆基地的规模.     

Synthesis and Crystal Structure of Blue Luminescent Cadmium(II) Coordination Networks with 4,4′-Bis(imidazol-1-ylmethyl)biphenyl from Different Solvent Systems

Two supramolecular complexes, [Cd(bimb)²Cl²] (1) and [Cd(bimb)(DMF)Cl²]·DMF (2) [bimb=4,4′-bis(imidazol-1-ylmethyl)biphenyl], were synthesized by reactions of CdCl²·2.5H²O with bimb ligand in ethanol and N,N′-dimethylformamide (DMF), respectively, and their structures were determined by X-ray crystallography. Complex 1 is an infinite 2D grid network bridged by bimb ligands, and the 2D sheets were further linked by C–H ?Cl hydrogen bonds to form a polycatenated 3D framework. Complex 2 has dicadmium(II) di-μ-chloride units which are connected by bimb bridging ligands to form an infinite non-interpenetrating 2D network. The results provide a nice example of the solvent system exerting a great effect on the construction of supramolecular frameworks.     

综合嵌入式视觉与网络智能通信的监控系统

基于物联网技术的操作平台,利用DSP,ARM技术的强大数据图像处理能力,结合互联网、移动通信网等网络进行信息的传送与交互,及智能计算技术对信息进行分析处理,提高产品的监控能力。     

“无线传感网络”课程教学研究

针对目前高等院校物联网工程专业＂无线传感网络＂课程教学存在的主要问题,考虑学生因素,从课程设置、教学方法、综合素质培养等三个方面提出了合理的解决办法,以便有效提高学生的理论知识和专业技能.     

浅谈通信企业的驻地网建设

驻地网是指在一定区域内进行的土建项目竣工后,用光纤或铜缆通信设备连接形成的网络。驻地网建设既与房地产建设相互依存,又是通信企业固定终端发展的根基。从重视程度不足和机构设置不完善两方面分析了目前中国联通在驻地网建设和经营中存在的问题,并从加强机构建设、增加资金投入、重视工作协调、提高服务质量等几方面提出了相应措施。     

Adaptive multimedia streaming using a simulation test bed

The major purpose of this paper is to transmit an existing video above a complete simulated video streaming architecture based on Network Simulator (NS2). Thanks to our architecture, the visual quality evaluation of the distributed streaming platform under various conditions is simplified. Indeed, the received video can be easily visualized using a classic video client or be compared using the Peak Signal-Noise Ratio (PSNR) value and the Structural SIMilarity (SSIM) value. In the case study, we compare adaptive video congestion strategies using a transcoder, Datagram Congestion Control Protocol (DCCP) and TCP-Friendly Rate Control (TFRC).     

The cut condition for robust network design

We consider the Robust Network Design problem, i.e. the problem of dimensioning the capacities on the edges of a graph to serve point-to-point traffic demands subject to uncertainty. The scope of the paper is to investigate when the cut condition is sufficient to guarantee the feasibility for such problem.     

Vulnerability analysis of interdependent infrastructure systems: A methodological framework

Infrastructure systems such as power and water supplies make up the cornerstone of modern society which is essential for the functioning of a society and its economy. They become more and more interconnected and interdependent with the development of scientific technology and social economy. Risk and vulnerability analysis of interdependent infrastructures for security considerations has become an important subject, and some achievements have been made in this area. Since different infrastructure systems have different structural and functional properties, there is no universal all-encompassing ‘silver bullet solution’ to the problem of analyzing the vulnerability associated with interdependent infrastructure systems. So a framework of analysis is required. This paper takes the power and water systems of a major city in China as an example and develops a framework for the analysis of the vulnerability of interdependent infrastructure systems. Four interface design strategies based on distance, betweenness, degree, and clustering coefficient are constructed. Then two types of vulnerability (long-term vulnerability and focused vulnerability) are illustrated and analyzed. Finally, a method for ranking critical components in interdependent infrastructures is given for protection purposes. It is concluded that the framework proposed here is useful for vulnerability analysis of interdependent systems and it will be helpful for the system owners to make better decisions on infrastructure design and protection.     

一种基于样本块的图像超分辨率方法研究

提出了一种在马尔科夫网络框架下基于样本块的图像超分辨率算法。算法根据相似性选取多个样本块作为图像重建的候选,在候选集中计算图像块先验概率和图像块之间的相容性,最后在马尔科夫框架下选取最优图像块,合成最终的高分辨率图像。实验证明本文提出的算法具有较好的超分辨率效果。     

3G时代下成人教育教学管理新“网络”模型

成人教育已从最初的函授等传统教育方式逐步发展为依托现代计算机信息技术和网络技术的远程教育形式。随着终身教育的理念深入人心和国家大力发展现代远程教育的政策推出，一种更加自主化、个性化、l主动化、彻底打破空间时间限制的教育教学和管理方式越来越被社会所期待，这是一种全新的教学和管理“网络化”模式，而这里的“网络”则涵盖两方面意义：一是立体网络化的管理方式；二是高速宽带，3G无线网络时代下利用全新网络技术的管理和教学方式。文章以现有学校的教学管理模式和网络技术发展现状为出发点，阐述在已经到来的3G时代下，该新型网络模型的可行性及实际实践的两个方向。