面向智慧教室的无线传感网边缘节点智能部署方法

摘 要: 为降低部署后的通信时延,提高智慧教室的数据发送与网络使用效率,提出面向智慧教室的无线传感网边缘节点智能部署方法。以智慧教室场景中良好的通信、最大限度降低部署边缘节点成本为优化目标,构建边缘节点智能部署的目标函数。针对目标函数设定流量约束条件、无线传感网数据流约束条件、节点计算能力约束条件。自适应调整粒子群优化算法的惯性权重、粒子更新速度、Pareto最优解保存策略,设计多目标改进粒子群优化算法求解目标函数,实现面向智慧教室的无线传感网边缘节点智能部署。测试结果表明,该方法的时延较低,网络计算能力较高,保证了智慧教室无线传感网通信和传输质量。     

变电所微机装置防雷保护

介绍了区域变电所微机保护装置改造后的常发性故障——微机保护装置落雷损坏的现象及其成因,提出了微机保护装置防雷保护的处理步骤,对微机保护装置的安全运行具有重要意义。     

PMN–PT based relaxor ferroelectrics as very smart materials

The basic classification of smart materials and structures is reviewed briefly. The role of nonlinear response for achieving field-tunability of properties is described in simple terms. The observation of the two-way shape-memory effect in a solid solution of lead magnesium niobate (PMN) and lead titanate (PT) for the nominal atomic composition 65:35 is reported. Possible factors influencing the occurrence of the two-way effect are discussed. It is argued that such relaxor ferroelectric ceramics can function as smart materials (rather than serving merely as components of smart structures), because they can meet the “information-reduction” criterion. And they qualify to be called very smart because they have a fairly large number of smartness attributes, including the two-way shape-memory attribute reported here.     

不同初始组织结构的形状记忆合金性能及参数的研究

NiTi形状记忆合金作为一种功能材料，以往的研究主要集中在材料领域。然而当它被用作主动变形结构中的驱动元件时，则需要对NiTi形状记忆合金在相变过程中的力学、电学和热学性能进行综合研究，本文从试验的角度出发，对具有不同初始组织结构的NiTi形状记忆合金的性能及参数进行研究，为更好地了解NiTi形状记忆合金的驱动机理和控制它的驱动行为打下基础，为形状记忆合金驱动器的设计提供参考和依据。     

Attacks on the (enhanced) Yang-Shieh authentication

The Yang-Shieh authentication is a time-stamp based password authentication scheme that uses smart cards [[1]]. In [ [2 and 3]], various attacks on this scheme are described. However, an enhancement of the scheme is proposed in [ [3]] and enables the scheme to resist these existing attacks. In this paper, we show two new attack that can break the enhanced scheme. We further point out that the fundamental computational assumption of the Yang-Shieh authentication scheme is incorrect.     

家用小型中央空调系统效果图CAD软件的设计及实现

该文介绍了一种家用小型中央空调系统的效果因辅助设计和管理软件。在研究模具库和效果因的数据结构的基础上,给出了设计方案及实现方法。     

Oxide electrochromics: Why, how, and whither

Electrochromic oxides form the basis of “smart windows” which are able to provide energy efficiency and indoor comfort simultaneously. This paper attempts to give an introduction to “smart windows” technology, which finally seems to be ready for large-scale applications. The “whys” and “hows” are discussed from the viewpoints of materials, device technology, low-cost manufacturing aspects, and applications to buildings as well as niche products. Furthermore, there are some speculations as to the “whithers” of oxide electrochromics for applications to buildings of the future.     

机敏混凝土

混凝土是现代最主要的建筑材料 ,但其功能单一、技术含量低、耐久性差的特点严重制约了混凝土材料的发展 ,因此在混凝土材料中复合一些特殊材料 ,使之具有某些特殊功能 ,机敏混凝土就是这样一种具有感知和修复性能的智能混凝土 ,是在混凝土原有的组成基础上掺加复合智能型组分 ,使其具有一定的自感知、自适应和损伤自修复等智能特性的多功能材料     

Telehealth in Context: Socio-technical Barriers to Telehealth use in Labrador,Canada

Currently telehealth is being offered as an innovative solution to austerity, staffing issues and problems accessing care in Canada’s rural communities. Despite the current enthusiasm for telehealth in provincial and federal policy documents, many of these promises have not been realized. The Labrador region is a large and sparsely populated area that was vested with a federal “Smart Community” project to increase the region’s technological capacity, making it one of the most connected locales in the country. While telehealth was a key component of the SmartLabrador plan, there has been limited uptake of newly available technologies for the purposes of mediating distance in health care. My work critically examines the factors surrounding this lack of uptake, and takes the work of Harold Innis as a starting point when analyzing the breakdown of time and space in Labrador. Focused around qualitative field research conducted in Labrador in 2003, I explore spatialization, structuration and work practice as they relate to telehealth use and non-use in the region. I review federal and provincial telehealth policy to provide a macro context for the study, which I then link to meso and micro levels of analysis in organization structures and situated work practice. I examine telehealth in the user context from the health care provider perspective. This reveals several constraints that have limited the usage of new technologies for health communication in Labrador. The user context must be considered in the design of telehealth programs and policy if the desired outcomes for telehealth are to be realized. The barriers to telehealth use are not simply technical, but relate to issues of privacy, culture and trust. I discuss these and other barriers with a focus on the needs of the Labrador community. This paper is based on research conducted in partnership with the SmartLabrador initiative, a federal Smart Community project which grew out of the grassroots Labrador Information Technology Initiative. This partnership helped me to establish contact with telehealth stakeholders in the region; paid for a portion of research travel; and provided me with an office and home base for the duration of the fieldwork. This research was conducted as part of the SSHRC funded project “From Work Practice to Public Policy: Case Studies of the Canadian Health Infostructure”.