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The inference of the network traffic matrix from partial measurement data becomes increasingly critical for various network engineering tasks, such as capacity planning, load balancing, path setup, network provisioning, anomaly detection, and failure recovery. The recent study shows it is promising to more accurately interpolate the missing data with a three-dimensional tensor as compared to interpolation...
Phasor Measurement Units (PMUs) provide high precision data at high sampling rates to support Smart Grid applications. Power Line Outage detection mechanisms can enhance the grid reliability by assisting power operators in taking proper control actions. Despite the potential provided by PMUs, there are very limited efforts on exploiting data available to more effectively detect outages. Conventional...
As the most abundant inland river of water resource in Liaoning province, Hun River affords industrial and agricultural production and domestic water task in central city group of Liaoning province. Recently, dozens of sewage draining exits in different sizes are constantly discharging along Hun River. Environmental monitoring communique can discover that indicators of ammonia nitrogen and COD are...
Vehicles equipped with various types of sensors can act as mobile sensors to monitor the road conditions. To speed up the information collection process, the monitoring data can be shared among vehicles upon their encounters to facilitate drivers to find a good route. The vehicular network experiences intermittent connectivity as a result of the mobility, which makes the inter-vehicle contact duration...
Measurement samples are often taken in various monitoring applications. To reduce the sensing cost, it is desirable to achieve better sensing quality while using fewer samples. Compressive Sensing (CS) technique finds its role when the signal to be sampled meets certain sparsity requirements. In this paper we investigate the possibility and basic techniques that could further reduce the number of...
More and more vehicles are equipped with various types of sensors, and can be exploited as mobile sensors to monitor the road conditions. To quickly gather road condition information of an urban area, by exploiting both scarce contact resource in the vehicular DTN and patrol vehicles, this paper proposes a novel compressive sensing (CS) based urban monitoring scheme, called CS-Monitoring. We propose...
With the rapid development of Chinese economy in recent years, the consumption of energy increases greatly. Building energy consumption accounts for a large part of the total consumption. Building energy conservation is an essential and urgent measure to build the conservation-oriented society. In order to obtain the dynamic information of the building energy consumption efficiently and accurately,...
Wireless sensor and actuator networks (WSANs) have been widely implemented in smart grid to monitor and control their environment. We consider the sensor selection schemes for parameter estimation in energy constraint WSANs. To prolong the network lifetime and optimize energy consumption, only sensors experiencing favorable conditions will participate in the estimation process. In this paper, we study...
The surface ozone levels over Xi'an, China were monitored every 5-min using the Model ML/EC9810 ozone analyzer from March 23, 2008 to January 12, 2009. The daily ozone concentrations ranged from 0.43 ppbv to 64.23 ppbv, averaging a yearly mean value of 16.04 ppbv. Seasonal variation of ozone levels showed a clear summer maximum and winter minimum pattern. The diurnal variation of ground ozone showed...
Based on the precipitation monitoring data of Xiangtan from 2004 to 2008 and from 1993 to 1998, the article mainly analyzed the characteristics, regularity and development tendency of acid rain in Xiangtan. And then, some advices are taken according to the status and characteristics of acid rain of Xiangtan.
Worldwide demand for renewable energy is increasing rapidly because of the climate problem, and also because oil resources are limited. Wind energy appears as a clean and good solution to cope with a great part of this energy demand. As space is becoming scarce for the installation of onshore wind turbines, offshore wind energy becomes a good alternative. Renewable electricity from wind power can...
This paper presents an online steady-state visual evoked potential (SSVEP) based brain-computer interface (BCI). Stimuli are displayed on a liquid crystal display (LCD) screen with a frame based encoding method to elicit SSVEPs with a wide range of frequencies. This system focuses strongly on practicability and convenience, including an adequate alphabet (42 characters) that can allow a wide range...
It is the first time that the Antarctic super low frequency (SLF) and extremely low frequency (ELF) radio atmospheric noise has been measured in China. The time domain profile and the frequency domain profile of the data have been gained by analyzing and processing the measured data, and the change characteristic of the radio atmospheric noise has been discussed along the day, night and the frequency...
Due to the characteristic of rare earth extraction separation, combined with the material balance model, an approach based on multiple model is presented in this paper. Firstly, by using the data selected in an industrial process, the steady points are obtained, which use the improved subtractive clustering algorithm. The recursive least-square identification method is then adopted to identify the...
Short playback lag is preferred in many urgent and interactive scenarios such as live sports and distance education. However, measurement studies have shown that many popular P2P live streaming systems still suffer from long playback lag, say, more than 100 seconds, which makes the live streaming less realtime. Due to the unstructured nature of P2P networks, it is really a challenge to reduce the...
The objective of many applications with the surveillance missions in wireless sensor networks is to provide long-term monitoring of the specific environments, such as disaster-hit regions. These applications usually perform continuous monitoring without any maintenance, even if some sensor nodes fail. A significant challenge when designing the data collection approaches for such systems is that the...
An approach of retrieving district evapotranspiration was studied by using remotely sensed biomass products in the Junchuan Farm of the Northeast of China. Based on the crop management practices of the Junchuan Farm, key soil and crop canopy parameters were applied to develop a biomass model for retrieving district evapotranspiration. Using the mass of dry matter on ground, apportionment coefficient...
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