Tecnura

27-37

Authors: Nelson Enrique Vera Parra, Danilo Alfonso López, Héctor Cristyan Manta Caro

Currently, mobile networks and next generation wireless networks such as, IPv6 low-power Wireless Personal Area networks 6LoWPAN, wireless sensor networks and hierarchical mobile networks in IPv6, are under rigorous research and development, thereforethose networks represent the next step in the evolution of the Machine-to-Machine M2M networks, while supporting broadband access for the next generation of intelligent systems, technologies and future Internet. These next generation networks impose restrictions on the processing power, bandwidth and energy resources, which represents a major constraint in the implementation of security mechanisms. In this regard, in recent years there have been various proposals for key management, digital signature procedures and data encryption based on elliptic and hyper-elliptic curves, to achieve levels of safety equivalent to convenWLRQDO DOJRULWKPV EDVHG RQ 'LI¿H+HOOPDQ DQG Rivest-Shamir-Adleman RSA, but reducing the key length and thus the computational and network resources. This paper reviews algorithms based on Elliptic Curves Cryptography ECC and their application to IPv6-enabled new generation wireless networks. This paper also describes a simulation test-bed for the evaluation of ECC, where we compare computational resources required and limitations for lightweight security mechanisms in se

53-63

Authors: Jesús D. González Llorente, Gustavo A. Puerto Leguizamón

CubeSats are small satellites that due to their size restriction have photovoltaic cells placed on theirs surface as the only energy source. The purpose of this work is to estimate the maximum amount of power that can be obtained from these solar cells, so that an energy balance can be made during the design of space mission with this kind of satellites. In the analyzed scenario, a CubeSat of 10cm x 10cm x 10cm (1U) has always a face oriented toward the Earth. Cosine loss and the temperature variation due to satellite orbit are considered. For the estimation we use a mathematical model of the solar cells, which is also used to estimate the maximum power point according to the incidence angle of the solar radiation and the temperature on a low orbit around the Earth. The results show the variation of the maximum electric power supplied by the panels on the illuminated portion of the orbit, without considering the Earth’s albedo. Apart from the power, the current -voltage curves are estimated for different locations over the CubeSat’s orbit.

76-90

Authors: Andrés Jaramillo Ortiz, Robinson Jiménez M, Olga Lucía Ramos

This paper details implementation of an artificial vision system through digital image processing, which allows automation of the quality control process. The prototype was implemented in a conveyor belt segment and was designed to discern the quality of two different industrial shapes, with a sensibility of +/- 0,1 mm and a speed rate of 1400 shapes per hour, identifying which pieces are within manufacture quality requirements. This work is divided in three main sections: hardware, electronic control and software.

103-119

Authors: Luis Alberto Paredes Chérrez, Óscar Javier Reyes Ortiz, Javier Fernando Camacho Tauta

Mechanic characterization of asphalt mixtures uses to be expensive and time consuming. How- ever, some researches try to correlate such prop- erties by simple, fast and less expensive tests. The main goal of this investigation consisted into establish the viability of use the simply sup- ported semicircular beam (SCB) to characterize dense asphalt mixtures designed under speci- fications of the Instituto de Desarrollo Urbano (IDU) and the Instituto Nacional de Vías (In- vias). The study started with the production of SCB specimens using different materials (soil aggregate, asphalt, asphaltite, reclaimed asphalt pavement and lime) and compaction techniques (vibration and gyratory compaction). The SCB tests were carried at a velocity of 1mm/min and 15ºC of temperature. From these tests, different parameters were obtained based on the definition in the Fénix test (maximum load, displacement at maximum loading, energy released during the cracking process, traction stiffness index and te- nacity index). From the results, it was found that the SCB tests were useful as a tool to character- ize the mechanical properties of the asphalt mix- tures. This conclusion is applicable for all kind of mixtures tested, ageing periods, compaction level and filler content.

134-153

Authors: Hernán Porras Díaz, Jhon Jairo Cáceres Jiménez, Elver Omar Gallo Lancheros

The state of the art of the processing methods for TLS (terrestrial laser scanner) digital point clouds is shown in this paper. The TLS is an instrument able to capture topographic and geometric information of any structure at millimeter accuracy. Also, in some cases, they capture radiometric information of the scanned objects. The collected information is represented by point clouds that are used on a wide range of applications such as planning of urban development, structural analysis, erosion and deforestation modeling, cultural heritage preservation and virtual navigation. The purpose of this work is to offer a review of the state of the art on the methods used through the several steps of the point cloud processing workflow: relative and absolute registration, segmentation, classification and three dimensional modeling.