Time filter

Source Type

Santiago de Querétaro, Mexico

Avelar-Sosa L.,Autonomous University of Ciudad Juarez | Garcia-Alcaraz J.L.,Autonomous University of Ciudad Juarez | Cedillo-Campos M.G.,Instituto Mexicano del Transporte | Adarme-Jaimes W.,National University of Colombia
DYNA (Colombia) | Year: 2014

In this paper appears an analysis of the effects of regional infrastructure and the services in the supply chains performance in manufacturing companies collated in Ciudad Juarez, Chihuahua, Mexico. To collect the information, 120 surveys were applied to companies, and to obtain a causal with structural equation modelling to explain those effects, a methodology of partial least squares was used with WarpPls 3.0®. The results indicate that a good level in the regional infrastructure has a positive impact on logistics services, and as a consequence in the costs. Also, the regional infrastructure has a positive impact on time delivery of products. Regarding the level of infrastructure (transport, telecommunications, and internet) and services (air, land, financial, legal) in Ciudad Juarez, respondents are considering that it is good, so the product deliveries are complete on time in the past 3 years. © The authors; licensee Universidad Nacional de Colombia. Source

Torres-Acosta A.A.,Marista University | Torres-Acosta A.A.,Instituto Mexicano del Transporte | Castro-Borges P.,CINVESTAV
Corrosion | Year: 2013

The mechanism of corrosion-induced concrete cover cracking has received greater attention in recent years. Most studies involve accelerated electrochemical techniques to measure the corrosion required to induce concrete cracking. Concrete cylinders with different water/cement ratios exposed to a natural tropical marine environment were used to measure corrosion parameters such as time-to-corrosion initiation, apparent corrosion rate, cracking initiation, rebar radius loss to begin concrete cover cracking, and rebar pitting corrosion depth. Experimental results indicated a correlation between apparent corrosion rate values vs. rebar radius loss to begin concrete cover cracking, and average radius loss due to corrosion vs. maximum pit depth, during the remaining life period. The water/cement ratio is the most important parameter affecting crack generation and propagation, and apparent corrosion rate estimates. © 2013, NACE International. Source

Chavez H.,University of Texas at San Antonio | Castillo-Villar K.K.,University of Texas at San Antonio | Herrera L.,Monterrey Institute of Technology | Bustos A.,Instituto Mexicano del Transporte
Robotics and Computer-Integrated Manufacturing | Year: 2016

Unpredictable disruptions (e.g., accidents, traffic conditions, among others) in supply chains (SCs) motivate the development of decision tools that allow designing resilient routing strategies. The transportation problem, for which a model is proposed in this paper, consists of minimizing the stochastic transportation time and the deterministic freight rate. This paper extends a stochastic multi-objective minimum cost flow (SMMCF) model by proposing a novel simulation-based multi-objective optimization (SimMOpt) solution procedure. A real case study, consisting of the road transportation of perishable agricultural products from Mexico to the United States, is presented and solved using the proposed SMMCF-Continuous/SimMOpt solution framework. In this case study, time variability is caused by the inspection of products at the U.S.-Mexico border ports of entry. The results demonstrate that this framework is effective and overcomes the limitations of the multi-objective stochastic minimum cost flow problem (which becomes intractable for large-scale instances). © 2016 Elsevier Ltd. Source

Gonzalez-Feliu J.,Institute Henri Fayol | Cedillo-Campo M.G.,Instituto Mexicano del Transporte | Garcia-Alcaraz J.L.,Autonomous University of Ciudad Juarez
DYNA (Colombia) | Year: 2014

This paper presents an alternative method to O-D matrix for estimating road occupancy of urban goods movement (UGM). The originality of the model arises on three elements. The first is that the modelling unit is the delivery operation, with all the elements that are associated to it. The second is that it follows an inductive approach, starting from a rich database, to define different generation functions without a priori applying a defined mathematical framework. The third is that the model is an emission one, i.e. we start generating the number of deliveries that are shipped by the different urban establishments, and not those attracted by them. First, the literature in the field is reviewed. Then, the main methodological elements are presented. We present here the delivery generation procedure and the route definition method. Finally, validation results for both parts of the model are critically discussed. © The author; licensee Universidad Nacional de Colombia. Source

Astudillo N.C.G.,Autonomous University of Queretaro | Del Rociao Peniche Vera R.,Autonomous University of Queretaro | Ruiz G.H.,Autonomous University of Queretaro | Cardenas R.A.,Autonomous University of Queretaro | Viramontes F.J.C.,Instituto Mexicano del Transporte
Engineering Computations (Swansea, Wales) | Year: 2013

Purpose - The purpose of this paper is to introduce a novel methodology that has the capability of finding symmetrical and nonsymmetrical solutions in complex design domains without additional tuning when changing the design domain. These go from an academic design domain to a practical one. Design/methodology/approach - Various crossovers operators are applied over the same representation using a genetic algorithm for truss structural optimization cases where literature solutions have a tendency to forced symmetry in order to find an optimal design with fewer iterations. Continuous-discrete representations were cross-bred by a uniform-sbx simultaneous crossover, called zygote crossover. Specialized mutations operations are proposed to generate localized changes to improve the solution according with the design domain. Findings - Design solutions found were lighter and stiffer when comparing against cases reported in current literature and in engineering practice. Also these solutions were found in fewer iterations. Practical implications - The cases solved herein are complex and are a challenge for any optimization routine however practical design limitations are observed in the sense of out plane stability. Further comparisons cases are required in order to generate a less adjusted design, this is because the greenhouse solution had to be stiffened with out of plane bars to give it enough lateral stability. Originality/value - Continuous-discrete representations were cross-bred by a uniform-sbx simultaneous crossover, called natural crossover. Specialized mutations operations are proposed to generate localized changes to improve the solution according with the design domain. This scheme along with a less restrictive environment allows a wider exploration of search space. © Emerald Group Publishing Limited. Source

Discover hidden collaborations