Jacir Luiz Bordim

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— Wireless ad hoc networks are typically assumed to be equipped with omnidirectional antennas. With advances in signal processing and antenna technology, it may now be possible to incorporate sophisticated antennas into portable devices, and thereby exploit the benefits of beamforming at the MAC, network, and transport layer. Recent networking research has(More)
The main contribution of this work is to present energy-efficient protocols that compute the sum of n numbers over any commutative and associative binary operator stored in n wireless sensor nodes arranged in a two-dimensional grid of size √ n × √ n. We first present a protocol that computes the sum in O(r 2 + (n r 2) 1 3) time slots with no sensor node(More)
Reading the contents of Web page with a small-screen device, such as a PDA or cell-phone, is still far from being a pleasant experience. Owing to the device limitations, current mobile browsers cannot handle all HTML tags, such as tables, for instance. Thus, most mobile browsers provide a linearized version of the source HTML page, leading to a large amount(More)
The main contribution of this work is to propose energy-eecient randomized initialization protocols for ad-hoc radio networks (ARN, for short). First, we show that if the number n of stations is known beforehand, the single-channel ARN can be initialized by a protocol that terminates, with high probability, in O(n) time slots with no station being awake for(More)