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Near Field Communication (NFC) readers, ubiquitously embedded in smart-phones, buses and other infrastructures, are able to wirelessly deliver mW-level power to ultra-low power, passive NFC tags via a coupled magnetic field. Additionally, an NFC reader can leverage the coupled communication channel to support relatively heavy computational applications, such as sensing, visual displays, etc. Consequently,...
This paper presents a boost converter used to harvest photovoltaic energy, one of the most important renewable energy sources, and to converter it into a power supply for micro power devices. To meet the low power requirements of applications such as wireless sensor network, the converter is designed to work at burst-mode to reduce power consumption. And a simple Maximum Power Point Tracking (MPPT)...
The complete area coverage problem in Wireless Sensor Networks (WSNs) has been extensively studied in the literature. However, many applications do not require complete coverage all the time. For such applications, one effective method to save energy and prolong network lifetime is to partially cover the area. This method for prolonging network lifetime recently attracts much attention. However, due...
Due to the resource limitations of sensor nodes, providing security protocols is a particular challenge in sensor networks. A popular proposed method is the neighborhood based key agreement protocol (NEKAP), which is an improvement over the well-known Localized Encryption and Authentication Protocol (LEAP). NEKAP is an efficient and light-weight protocol, but includes loopholes through which adversaries...
Protocol architecture for a web-sensor gateway interconnecting internet and wireless sensor network is investigated. The web-sensor gateway is to deliver data between TCP/IP and Zigbee/IEEE802.15.4 protocols, transparently. Since the gateway provides a means to remotely control and aggregate sensor data over the internet, it needs to be designed in the view point of users and in their convenience...
The complete area coverage problem in wireless sensor networks (WSNs) where every point inside an area is covered by an active sensor has been extensively studied in the literature. However, there are many applications that do not always require complete coverage. For such applications, an effective method to save energy and prolong network lifetime is to partially cover the area. However, due to...
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