Jang-Yeon Lee

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The design of medium access control (MAC) in wireless sensor networks (WSNs) poses several key factors such as energy conservation, bandwidth utilization, throughput, etc. This paper proposes a new MAC protocol referred to as DEE-MAC which reduces energy consumption by making the idle nodes sleep to reduce idle listening using synchronization at cluster(More)
In this paper, development process of sensor-embedded main wing model as a test-bed of HUMS is described. Fiber Bragg Grating (FBG) Sensor, Plumbum-Zirconate-Titanate (PZT) Sensor, Acceleration Sensor, and Strain gauge are installed in the main wing. These sensors are located on the surface of the spar, the upper skin and the aileron of an ultra light(More)
SUMMARY The CSMA/CA driven MAC protocols withhold packet transmissions from exposed stations when they detect carrier signal above a certain threshold. This is to avoid collisions at other receiving stations. However, this conservative scheme often exposes many stations unnecessarily , and thus minimizes the utilization of the spatial spectral resource. In(More)
The many-to-one multihop traffic pattern of Wireless Sensor Networks (WSNs) puts a great challenge on enhancing the event-to-sink data delivery throughput. Because, in CSMA/CA driven medium access control protocols, contention of the shared medium raises both at the event detection area and near the sink, which in turn increases the packet collisions(More)
Automatic Dependent Surveillance - Broadcast (ADS-B) is a novel surveillance concept using the Global Positioning System (GPS) and a digital data-link. ADS-B provides a variety of benefits such as air-to-air surveillance capability, real-time traffic and aeronautical information in the cockpit, surveillance to remote or inhospitable areas that do not(More)