Engineering a city-wide ubiquitous computing system requires a comprehensive understanding of urban infrastructure including physical motorways, vehicular traffic, and human activities. Many world cities were built at different time periods and with different purposes that resulted in diversified structures and characteristics, which have to be carefully considered while designing ubiquitous computing facilities. In this paper, we propose a novel technique to study global urban infrastructure, with enabling city-wide ubiquitous computing as the aim, using a massive data-driven network of planet-scale online web-cameras and a location-based online social network service, Foursquare. Our approach examines six metropolitan regions infrastructure that includes more than 800 locations, 25 million vehicular mobility records, 220k routes, and two million Foursquare check-ins. We evaluate the spatio-temporal correlation in traffic patterns, examine the structure and connectivity in regions, and study the impact of human mobility on vehicular traffic to gain insight for enabling city-wide ubiquitous computing.

关键词：数据库管理；系统工程；计算机通讯；计算机模拟；通信和无线电系统

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The General Dynamics (GD) S-Band software defined radio (SDR) in the Space Communications and Navigation (SCAN) Testbed on the International Space Station (ISS) provides experimenters an opportunity to develop and demonstrate experimental waveforms .

关键词：算法；空间通信；超高频率；空间导航；通信；

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This study arose from the importance of having soldiers reliably connected to one another and to their chains of command, or 'networked,' despite the possibility of disruptions and/or degraded system performance. The objective was to identify possible new communications and information capabilities that ensure sufficient connectivity and performance to be able to successfully share information. Satellite communications and GPS today are force multipliers, providing forces with extensive connectivity and enabling control over battlefields. These communications and information capabilities can reduce uncertainty and suppress threats, but they must be implemented in ways that prevent adversaries from finding ways to deny, disrupt, and degrade them. Lessons from recent asymmetric confrontations (e.g., NATO operations in Syria, Egypt, and Libya) include the following: the deployment of standard military communication systems may not be sufficient to ensure adequate connectivity and information-related capabilities, the adversary can destroy networks without disrupting his own vital networks or exercising global control over public networks, and populations can respond to simple inputs using social networks. The solution posed by adversaries with these capabilities is to extend and integrate traditional C2 systems with a social network infrastructure concept, a C2 system applet applied to COTS devices, and a supporting concept like crowdsourcing in a protected environment. The resulting C2 system will be better able to operate successfully in a degraded operational environment where a simple SMS can make the difference. This paper demonstrates the value of this new approach with a simulation.

关键词：指挥和控制系统；通信网络；信息交流；融合；移动计算

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关键词：车辆安全;通信系统;动态数据;智能系统

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This is the final report of the COMNAVMETOCCOM Independent Model Review Panel (CIMREP) for the Voice of America Coverage Analysis Program (VOACAP), version 05.0119W, as modified by the Space and Naval Warfare Systems Center Pacific (SSC-Pacific), Atmospheric Propagation Branch (5528). VOACAP is a tool for predicting the performance of High Frequency (HF) radio communication systems. The authors evaluated VOACAP for possible inclusion in the Oceanography and Atmospheric Master Library (OAML) by (1) using provided and online documentation from HF experts, (2) installing the program on PCs, (3) running a series of test cases and (4) comparing the output results with other HF models and VOACAP versions.

关键词：通信和广播系统；电磁辐射；大气物理学；语音通信

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Ensuring the effectiveness and reliability of communications networks is essential to national security, the economy, and public health and safety. The communications networks (including core and access networks) can be threatened by both natural and human-caused events, including increasingly sophisticated and prevalent cyber-based threats. GAO has identified the protection of systems supporting the nation's critical infrastructure--which includes the communications sector--as a government-wide high-risk area. GAO was asked to (1) identify the roles of and actions taken by key federal entities to help protect communications networks from cyber-based threats, (2) assess what is known about the extent to which cyber incidents affecting the communications networks have been reported to the FCC and DHS, and (3) determine if Defense's pilot programs to promote cybersecurity in the defense industrial base can be used in the communications sector. To do this, GAO focused on core and access networks that support communication services, as well as critical components supporting the Internet. GAO analyzed federal agency policies, plans, and other documents; interviewed officials; and reviewed relevant reports.

关键词：通信；计算机网络；计算机安全；国家安全

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This paper presents a concept for a human mission to Mars orbit that features direct robotic exploration of the planet s surface via teleoperation from orbit. This mission is a good example of Human Exploration using Real-time Robotic Operations (HERRO), an exploration strategy that refrains from sending humans to the surfaces of planets with large gravity wells. HERRO avoids the need for complex and expensive man-rated lander/ascent vehicles and surface systems. Additionally, the humans are close enough to the surface to effectively eliminate the two-way communication latency that constrains typical robotic space missions, thus allowing real-time command and control of surface operations and experiments by the crew. Through use of state-of-the-art telecommunications and robotics, HERRO provides the cognitive and decision-making advantages of having humans at the site of study for only a fraction of the cost of conventional human surface missions. It is very similar to how oceanographers and oil companies use telerobotic submersibles to work in inaccessible areas of the ocean, and represents a more expedient, near-term step prior to landing humans on Mars and other large planetary bodies. Results suggest that a single HERRO mission with six crew members could achieve the same exploratory and scientific return as three conventional crewed missions to the Mars surface.

关键词：火星任务；指挥和控制；即时操作；通信

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Papers published via IEEE and AIAA conferences have presented an overview of how social media could benefit NASA working environments in general and proposed three specific social applications to benefit space flight control operations. 

关键词：飞行控制；通信；控制电路板；信息系统

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This document describes the process in which people receive and process information in order to take action during emergencies. Then, the document presents guidance on how to create and disseminate emergency information in the face of rapid-onset disasters providing guidance on the dissemination of alert signals, the creation of the warning message, the formatting of messages for both visual and audible means, and the dissemination of the warning message. The document ends with a discussion of research questions still left unanswered, and future efforts necessary to complete a comprehensive document on emergency message creation and dissemination for building disasters.

关键词：通信和无线电系统；建筑；报警系统；预警系统

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Since the 1960s, the National Highway Traffic Safety Administration (NHTSA) has worked with Federal, State, tribal and local partners to provide tools and resources for improving EMS systems. These partnerships have resulted in a range of products and services including guidance for improving the education of EMS personnel, improved data systems such as the National EMS Information System (NEMSIS) to measure and improve EMS performance, technical support for the development of 9-1-1 systems, and many others.

关键词：急医疗服务；通讯系统；教育；信息系统；电话系统

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