We study how the crossover exponent, φ, between the directed percolation (DP) and compact directed percolation (CDP) behaves as a function of the diffusion rate in a model that generalizes the contact process. Our conclusions are based in results pointed by perturbative series expansions and numerical simulations, and are consistent with a value φ = 2 for finite diffusion rates and φ = 1 in the...

Directed diffusion is a prominent example of data-centric routing based on application layer data and purely local interactions. In its functioning it relies heavily on network-wide flooding which is an expensive operation, specifically with respect to the scarce energy resources of nodes in wireless sensor networks (WSNs). One well-researched way to curb the flooding overhead is by clustering....

Given a directed arc-weighted graph G with n nodes, a root r and k terminals, the Directed Steiner Tree problem (DST) consists in finding a minimum-weight tree rooted at r and spanning all the terminals. If this problem has several applications in multicast routing in packet switching networks, the modeling is not adapted anymore in networks based upon the circuit switching principle in which s...

Wireless Sensor Networks comprise of innumerable small sensors that have limited resources. As wireless sensor networks are usually deployed in remote and unfriendly environment to transmit sensitive and crucial information, sensor nodes are vulnerable to node compromise attacks. Security issues such as data confidentiality and integrity which are of utmost importance need proper consideration ...

We propose LPDD (Lifetime Prediction Directed Diffusion), a novel energy-aware routing protocol for sensor networks that aims at increasing network survivability without a significant increase in latency. The key concept behind the protocol is the adaptive selection of routes by predicting the battery lifetime of the minimum energy nodes along the routes. key words: sensor networks, energy-awar...