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Smart wireless water meter reading system for multi-story residential buildings
FU Songyin, WANG Rangding, YAO Ling, ZHANG Chengyu, SHAN Guanmin, HU Guowei
Journal of Computer Applications 2017, 37 (
1
): 170-174. DOI:
10.11772/j.issn.1001-9081.2017.01.0170
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568
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Smart Wireless Water Meter Reading System (SWWMRS) built on the conventional Wireless Sensor Network (WSN) platform can not meet the requirements of low cost, low power consumption, high efficiency and high reliability in practice. In this work, a novel SWWMRS for typical multi-story buildings was proposed. Based on the feature of the SWWMRS and deployment environment as well as the business logic, an improved algorithm for all neighbor discoveries was proposed to achieve automatic networking and centralized routing management. At the meter reading stage, a minimum global forward strategy with a minimum residual energy nodes avoidance strategy were adopted to balance the energy consumption between nodes. Additionally, the mechanism to avoid confliction in Media Access Control (MAC) layer and the low power idle listening strategy were optimized. The testing results for the proposed system in a 24-story residential building show that the system performance of communication distance, power consumption and reliability can meet the needs of the practical applications. Meanwhile, compared with CC2530 scheme, better performance in communication distance, meter reading success rate, efficiency and power consumption can be achieved.
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Near field communication-enabled water meter system with mobile payment
ZHANG Chengyu, WANG Rangding, YAO Ling, FU Songyin, ZUO Fuqiang, GAO Qifei, JIANG Ming
Journal of Computer Applications 2017, 37 (
1
): 166-169. DOI:
10.11772/j.issn.1001-9081.2017.01.0166
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In view of the problems of traditional prepaid meters such as inefficiency and inconvenience, a Near Field Communication (NFC)-enabled water meter system that has the functions of mobile payment and data query was proposed. Firstly, according to the business requirements of the prepaid water meter, the overall architecture of the water meter system was developed based on NFC technology, and the software and hardware were designed. Secondly, a low-power mechanism which was used to wake up the water meter by detecting the external magnetic field changes was proposed. Finally, the security performance in mobile payment of the water meter system was analyzed based on NFC security protocols. The experimental results show that users can dynamically awake the water meter system, and utilize the functions of mobile payment, data querying and data uploading, by using the NFC mobile phones or other mobile terminals with NFC module.
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Architecture and scheduling scheme design of TsinghuaCloud based on OpenStack
Shaoka ZHAO LI Liyao LING Xiao XU Cong YANG Jiahai
Journal of Computer Applications 2013, 33 (
12
): 3335-3338.
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Based on cloud computings architecture and the actual demands of Tsinghua University, followed by utilizing the advanced OpenStack platform, adopting hierarchical design method, the TsinghuaCloud platform that could be used to perform integrated management on cloud resources was designed and implemented. The advantages and main required module functions of this system were analyzed. Focusing on the resource scheduling, a strategy based on task scheduling and load balancing was proposed. The experiment and analysis of the scheduling plan verify that the scheduling strategy can balance servers resource load on the basis of ensuring its service performance and execution efficiency, so as to make the cloud platform relatively stable.
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