JaeSub Kim

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In this paper, we present <i>Railroad</i>, a data dissemination architecture for large-scale wireless sensor networks. Railroad system proactively exploits a virtual infrastructure called <i>Rail</i>, which is an area where all the metadata of event data are stored. There is only one Rail in the network and it acts as a rendezvous area of the events and the(More)
SUMMARY In the sensor networks for surveillance, the requirements of providing energy efficiency and service differentiation, which is to deliver high-priority packets preferentially, while maintaining high goodput, which is to deliver many packets within their deadline are increasing. However , previous works have difficulties in satisfying the(More)
Energy is the most important resource in wireless sensor networks. The wireless interface of sensor node consumes most of the energy and therefore many MAC protocols are adopting the periodic listen-and-sleep scheme. However, the periodic listen-and-sleep approach results in high latency and low throughput. For low latency in multi-hop forwarding without(More)
In this paper we present a system, called U-interactive, that provides spontaneous interactions between human and surrounding objects in heterogenous ubiquitous computing environments. Our U-interactive system introduces a virtual map, which contains interactive objects around a user in each ubiquitous environment. In the virtual map, each interactive(More)
The operation of a sensor node is limited by the initially equipped battery which is hard to be recharged or replaced. Thus reducing unnecessary energy consumption is one of the most important requirements. Most energy waste is from the always-on wireless interface and many new MAC protocols have been suggested to solve the problem. However, they sacrifice(More)