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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)
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)
This paper proposes a novel MAC protocol for sensor networks which is energy efficient and has a good performance as well. Energy is the most important resource in battery-operated sensor networks. Sensor nodes need the wireless network interface to forward data and it has to be always awake to handle possible traffics. This occupies most energy wastes in(More)
We describe F-TCP, a new TCP for file transfer in high bandwidth-delay product networks. TCP is not suitable for file transfer application in high bandwidth-delay product networks. There needs a protocol that should not take away too much bandwidth from standard TCP flows while utilizing the full bandwidth of high-speed networks. This paper presents another(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)
Transmission schemes that gain contents from multiple servers concurrently are highlighted due to their ability of bandwidth aggregation, stability on dynamic server departure, and load balancing. Previous application layer approaches aggregate server bandwidth by slicing the contents into fixed size chunks and requesting each chunk to a different server.(More)