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Comparing with the traditional grid, energy internet will collect data widely and connect more broader. The analysis of electrical data use of Non-intrusive Load Monitoring (NILM) can infer user behavior privacy. Consideration both data security and availability is a problem must be addressed. Due to its rigid and provable privacy guarantee, Differential Privacy has proverbially reached and applied...
Land subsidence is one of the important geological hazards in urban construction in Beijing, which has received the attention of academia and government departments. Ground settlement have caused damage of the buildings, railways, bridges and other infrastructure and have caused huge losses of economic, urban construction and people's lives. In this study, we monitor the temporal and spatial distribution...
Taking the typical subsidence area in Beijing as the study areas, the study applied the Persistent Scatterer InSAR (PS-InSAR) to process two SAR datasets, which was acquired by TERRASAR-X and RADARSAT-2 satellites, at ascending and descending orbits respectively. Eventually, the land subsidence over this area was obtained. Compared the two results, the monitoring results showed that the two datasets...
In China, the haze is breaking out, and it cannot be solved in a few decade years. In this paper, we used haze simulation laboratory, simulated the particulate concentration through the control experiment, and measured the soil reflectance under the different the particulate concentration. Then we analyzed the effect of different hazes on the different soil moisture reflectance: the reflectance is...
GNSS System time offset between two satellite navigation systems is one of the most important aspects of their interoperability and compatibility. This paper introduces the research work of GNSS System Time Offset Monitoring at NTSC. The method of GNSS System Time Offset monitoring by Signal-in-Space Reception is described. Multi-GNSS receiver calibration is the key technology of GNSS system time...
With the progress of Global Navigation Satellite Systems(GNSSs), which mainly includes GPS, GLONASS, GALILEO as well as BeiDou, multi-system joint working mode has become research focus and application trend. But, Each satellite navigation system has its own independent system time, such as GPST, GLONASST, GST and BDT. The System time offset between the two satellite navigation systems is one of the...
Based on TerraSAR data with high spatial resolution, the GAMMA software was used to obtain the distribution of land subsidence along the region of intercity railway between Beijing and Tianjin. Three-pass differential interferometry technology was adopted to monitor the land subsidence. Results showed that land subsidence is not obvious from March to July 2009 in the study area. The largest deformation...
Base on the analysis of traditional long-range medical healthcare system, the human body healthcare system used in the family is introduced in this paper. According to the requirements of family health monitor system, the paper compares several kinds of wireless communication technology which uses in the family, The system is presented to combine the short-range wireless communication technology Zigbee...
As a new networking topology, Wireless Mesh Networks (WMNs) have advantageous properties in terms of robustness, range extension and density, but also have significant potential disadvantages, which determines some classical load-balancing algorithms are not very suitable for WMNs. In this paper, we propose a novel load-balancing algorithm to improve the networks performance. The new scheme, which...
With Ajax firmly established as a widespread Web application-development technique, it is possible to build GPS monitoring system based on B/S architecture, so a large number of Web GPS monitoring systems are released recently. This article analyzes the common GPS monitoring systems based on AJAX and points out three main existing weaknesses. Then the article introduces how to use AJAX push pattern...
Groundwater plays more and more important role in people's daily lives and social development in the study area for lack of surface water resources. So works of groundwater quality monitoring and assessment have great meaning to protect the public health. The geographic information system (GIS), as an analysis tool and visualization platform, is used to support data used, monitoring and groundwater...
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