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We have reported a prototype of wireless sensor node with ultra-low power consumption which has promising application on the temperature monitoring in central air conditioning system. Air-flow driven nanogenerators are utilized to harvest electric energy directly from the wind tunnel in a building. Using a microcontroller unit with event-driven strategy, the wireless sensor nodes can send out a temperature...
Ultra-high-frequency (UHF) partial discharge detection has become a most important tool for condition maintenance of gas insulated substations (GIS). It is a prerequisite to make full use of the PD detection technology by ensuring the sensitivity and appropriate arrangement of UHF sensors. This paper presents a method for the evaluation on the performance of UHF sensors and their validity of arrangement...
This study presents a modified model for feature extraction of multivariate texture from remotely sensed imagery, which measures the spatial correlation of all the bands of a multispectral image with a designed distance metric using Cholesky decomposition of matrix and the transformation for Mahalanobis-Euclidean space. On this basis, a method of crop mapping and area extracting is developed and compared...
Dynamic TDD is one important feature of 3GPP Release 12. In parallel with the 3GPP standardization, a testbed has been developed to verify the feasibility of dynamic TDD and evaluate the performance in different scenarios. Both dynamic-TDD capable UE and eNode B have been developed. Fast TDD configuration using explicit physical layer signaling has been successfully implemented and over the air measurements...
To meet the requirements in real-time, reliability and sustainability for crop-growth environment monitoring in greenhouse precision agriculture, this paper designed intelligent greenhouse environment monitoring control system which is based on ZigBee and embedded technologies, in order to achieve intelligent control greenhouse crops growing environment. The system is based on ZigBee wireless network,...
This paper propose a new method for de-tecting distributed denial of service (DDoS) attack. By using the monitors on the edge network to record the traffic information in a Sketch matrix, we can get the suspicious attack traffic information as the local detec-tion result. Then, all the monitors that have found sus-picious information about the same destination IP or-ganize into an AutoTree to collaborative...
In response to the increasing ubiquity of multicore processors, there has been widespread development of multithreaded applications that strive to realize their full potential. Unfortunately, lock contention within operating systems can limit the scalability of multicore systems so severely that an increase in the number of cores can actually lead to reduced performance (i.e. scalability collapse)...
A Emergency Communication System based on Wireless Mesh Network (ECS-WMN) is proposed, which is easy to deploy and report the incidents and information such as personnel positions to the field rescue center and related members of rescue groups using different approaches, such as pop-ups on a computer or PDA screen, WiFi video terminals, WiFi cell phones and so on. A ECS-WMN consists of a WMN gateway,...
Recent researches have focused on continuous nearest neighbor queries in road networks with fixed weight, where all the users find the same routes to the nearest neighbors all the time. As more and more people follow the same way, traffic jams occur and users have to spend more time to get the destinations. In this paper, we propose a novel form of continuous k nearest neighbor queries considering...
A temperature monitoring system installed in Daqing Petrochemical Company, based on a combination of RS485 serial bus and optical fiber communication has been presented in this article, in which the intelligent temperature sensor DS18B20 was used. The interface circuit between the micro control unit (MCU) and DS18B20 has been designed, which can enhance the sensor-driven ability of the MCU and improve...
Dissolved gas analysis (DGA) is technique to relate the transformer fault with the gases dissolved in the insulating oil of oil-immersed transformer, which can be used to analyze some of the faults inside the transformer. The on-line DGA system designed in this article adopts the polymer film to extract the gases dissolved in oil, uses the gas sensors to detect the gas concentrations and the optical...
Traditional lineate monitor systems in coal mine can not meet the need as the modernize production developing, because they are difficulty to lay, dangerous and are difficulty to supply power. A new idea is studied in this article: using a new communication technology called ZigBee combined with the lineate communication to build a monitor system. This system is a wireless network which can detect...
Grain production is of great importance to any country, especially to China where nearly two-thirds of the population lives in rural area. Hence, it is meaningful for local and central governments to get accurate information about main crops acreage in time. Remote Sensing Applications Centre (RSAC), subjugating to the Ministry of Agricultural of China, has been working on monitoring the main crops...
In this paper, the Internet-based automation equipment intelligent monitor system is researched. It focuses on the ARM9 and Ethernet interface method, CAN/Ethernet protocol conversion and terminal building. Terminal mainly includes monitoring interface and Web database. The experiment results show that the system meets the accuracy, real-time and reliability of automatic maintenance equipment. And...
Islanding detection and protection is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over/under voltage protection (OVP/UVP) and over/under frequency protection (OFP/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in point of common coupling...
Passive islanding detection method is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over/Under Voltage Protection (OVP/UVP) and Over/Under Frequency Protection (OFP/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in point of common coupling...
The Real Time Kinematics Global Positioning System (RTK-GPS) has been proved to be a feasible tool for structure health monitoring. However, there are some limitations using the traditional RTK method under the long baseline conditions, and annoying ionospheric delay.To eliminate this delay, in this paper we present an improved Extended Kalman Filter with Triple-Differenced Ionospheric-Free (EKF-TDIF)...
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