Gonzalo Llano

Mobile ad-hoc routing protocols survey for the design of VANET applications

Vehicular communications are considered as a key factor to improve road safety and enhance urban mobility. The design and deployment of Vehicular Ad hoc Networks (VANETs) involve several decision criterias that lead the research into new challenging tasks to be solved. Routing mechanism is a fundamental component for the success of any vehicular application; the particular features of VANETs - a highly dynamic topology, links frequently disrupted and a fragmented network - require an efficient, robust and scalable routing strategy for each application. In this paper, we present a survey of routing protocols and we also provide a simulation testbed that will be used to assess the performance of the selected protocols.

DEVELOPMENT OF AN ANALYTIC MODEL THAT CHARACTERIZES THE FADE DEPTH OF IEEE 802.15.4a UWB CHANNELS

This article presents the development of an analytic model of variation of power or energy in function of the band width of the IEEE 802.15.4a UWB channel. This analytic model characterizes the fade depth of the channel UWB IEEE 802.15.4a, also shows that the power in the frequency domain of the UWB channel follows a Gamma statistical distribution. The overall results are obtained by simulation in Matlab, validated by Kolmogorov-Smirnov test and calculating the mean square error. Finally the theoretical results are compared with measurement campaigns done by other authors.

Fertilization Strategies in Sugar Cane Crops in the Cauca Valley: A Review

Our article analyzes several research approaches about fertilization strategies, considering the soil-plant-climate ecosystem. We used the systematic literature review methodology, aiming to answer the research questions raised in our study. Yield and productivity of sugar cane crops is closely related to quality and efficiency of fertilization strategies. We approach fertilization strategies in sugar cane crops analyzing old and new methodologies, recognizing their respective strengths and weaknesses, and looking for new improvements on them to prevent the environmental impact caused by crop fertilization.

Optimal Speed Advisory: a Vehicular Networks Application focused on decreasing CO2 emissions

Whilst the number of vehicles moving through the streets growths exponentially, the high density vehicular flow is now a mobility and a public health problem for governmental institutions and people, since the time of travel, gasoline consumption, and greenhouse gas (GHG) emissions have suffered an important increase. Hereby, several research projects aim to reduce the impact of this increase using new technological platforms like the so-called Vehicular Networks (VN), which are focused on the establishment of wireless connections between automobiles and/or fixed infrastructure. In this context, and aiming to reduce the potential carbon footprint of the vehicles, we have developed an application for the simulation of a VN using two software applications: SUMO and OMNeT++. The application we developed sends information packets directly to the cars about the adequate speed in a given area, optimizing the fuel usage and reducing the GHG emissions. Results show that when vehicles follow the speed (previously studied), the gasoline consumption and the GHG emissions present a considerable decrease compared to the vehicles not running at that speed.