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An energy efficient multi hop sensor network cannot avoid the energy hole problem, which is the rapid decrease in the energy of nodes around the sink. Also as a sensor network has a limited node resources and unexpected changes of external environment, its nodes should show energy efficiency, reliable data transmission, and topological adaptation to the change of external environment. This study proposes...
As a sensor network has a limited node resources and unexpected changes of external environment, its nodes should show energy efficiency, reliable data transmission, and topological adaptation to the change of external environment. However, it is not easy to satisfy these requirements at the same time. This study proposes Robust and Energy efficient Dynamic Single path routing (REDS), a routing mechanism...
Previous key management methods are not adequate for secure data communication through cluster-based routing. Because the cluster head is changed at each round in cluster-based routing, it has to take the step of authentication or shared key setting with each member node. In addition, because most of previous key management mechanisms do not assign mobility to all nodes in the sensor network, there...
A high-sensitivity capacitive-coupling interface is presented for wireless wafer testing systems. The transmitter is a buffer that drives the transmitter pad, and the receiver converts the data with various logic thresholds to that with optimum logic threshold. The receiver with the optimum logic threshold achieves the highest sensitivity of 25 mV at the data rate of 2 Gb/s in 0. 18 mum CMOS. The...
With research effort of Ubiquitous computing development, Wireless Sensor Networks have also been studied and deployed in many places. Recently various works for sharing the existing sensor data have been tried. In this paper we propose a P2P based system for sharing sensor data. It uses a structured P2P - Pastry to provide DHT based routing without server and has been deployed in KOREN. We classify...
The traditional cluster routing method is a typical method for enhancing an energy efficiency, which selects cluster head in order to send the aggregated data arriving from the nodes in cluster to a base station. However the major challenges are the equal distribution of each cluster over the whole sensor network and the energy dissipation caused by the frequent information exchange between selected...
A high-sensitivity capacitive-coupling receiver is presented for wireless wafer probing systems. The receiver with the optimum logic threshold (OLT) achieves the highest sensitivity of 25 mV at the data rate of 2 Gb/s in 0.18-mum CMOS. The OLT receiver increases the communication distance by more than four times while providing tolerance against distance-voltage-area variations.
WSNs, since the attacks, such as jamming or eavesdropping without physical access, easily occur, security is one of the important requirements for WSNs. The key pre- distribution scheme, recently being researched for advances of security in WSNs, distributes keys with probability with the use of q-composite random key pre-distribution method, but there is a high probability that there is no key shared...
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