This is Issue 31 of our scientific journal Revista Ingenierías Universidad de Medellín.
The confidence of different authors, peer reviewers, and readers in our journal allows us to advance firmly on the consolidation of our journal’s impact in the search for its Ibero-American positioning.
Evaluation of extract of neem tree (Azadirachta indica) as inhibitor of corrosion in saline medium
Pedro Meza-Castellar, Candelaria Tejada-Tovar, Shirley Loaiza-Fernández, Alexander...
The inhibition efficiency of corrosion of the extract of neem leaves (Azadirachta indica) on carbon steel and aluminum was evaluated in contact with a sodium chloride and sodium sulfate solution, both at 3.5% p/v. Corrosion speed was determined and it was found that the Neem extract, at a lower concentration, reached better efficiencies on carbon steel in sodium chloride with 78% efficiency using 5% of the extract; concerning the aluminum, the efficiency values reached were low. Besides, through the adjustment to the Langmuir’s isotherms, it was possible to determine that the nem extract was adsorbed spontaneously on the surface of carbon steel and allowed to delay the corrosive process when reaching inhibition efficiencies of 90%. Results of this research allow establishing that the neem extract has a high potential as corrosion inhibitor to be applied in the industry as corrosion preventive medium.
Anti-microbial compounds for textiles and their characterization methods
María del Pilar Maya Serna, Laura González Echavarría, Adriana Restrepo Osorio
Presence and proliferation of microorganisms in textiles while they are used or stored may cause negative effects on fabrics and health of people who use them. Such situation can be fought by employing anti-microbial agents to functionalize textiles. Current consumers want their garments to offer tested and durable antimicrobial benefits. This article includes a bibliographic revision of antimicrobial compounds used to functionalize different textiles, which avoid growth and development of microorganisms; for this reason, there are different types of antimicrobial agents such as the ones derived from natural organic compounds, synthetic organic compounds or inorganic compounds. Besides, characterization methods of the antimicrobial activity on textiles were reviewed and evaluated qualitatively and quantitatively according to AATCC, ASTM, and JIS standards.
Non-conventional absorbers: sustainable alternatives for wastewater treatment
Maria Guadalupe Valladares-Cisneros, Cintya Valerio Cárdenas, Patricia de la Cruz Burelo, Rosa...
This article shows a revision of the non-conventional absorbers employed for the removal of water pollutants. A brief description is made on the conventional absorbers in order to distinguish them from the non-conventional ones. Conventional absorbers are those natural or synthetic materials which employment is contingent with a treatment process so that they can be activated, such as carbon, clays, membranes, etc. After using these materials, they are able to be regenerated. Non-conventional absorbers are alternate materials (biopolymers or parts of plants); they should not necessarily be subject to a previous treatment to be activated; however, activation improves their absorption capacity. Sources studied for obtaining the materials employed as non-conventional absorbers include agroindustrial wastes, food industry wastes, and plant species which application is restricted or has no application at all. Different studies have shown that the employment of natural materials as non-conventional absorbers allows minimizing the organic discharge of a river contaminated with metals, dyes, pesticides, and other organic compounds known as emerging compounds. The fields of study for non-conventional materials emerge as a need for the design of sustainable process for the wastewater treatment; for this reason, the study and revision of non-conventional materials are of special interest to go deeper and propose alternative according to the existing needs.
Projection of the demand of construction materials in Colombia through the analysis of materials flows and systems dynamic
Juan Pablo Ríos Ocampo, Yris Olaya Morales, Gabriel Jaime Rivera León
This article provides an estimation of the future demand of construction materials in Colombia and necessary minerals to produce them by using systems dynamic and analysis of materials flows. Through the analysis of materials flows the amount of minerals required for the production of cement and concrete are determined. Required production of cement and concrete is estimated through a model of systems dynamic, which is adjusted with data from DANE construction census. Results indicate that, disregarding the secondary offer of materials, 176.9 million tons of ground aggregates, river sand, gray cement, dead rock, and cooked ceramic would be required. Manufacture of cement and concrete would require 15.4 million tons of lime, 14.9 million tons of gravel, 14.1 million tons of gypsum, and 13.3, 9.7, and 9.3 million tons of clay, iron minerals, and sand, respectively.
Gamification in higher education: a systematic review
Carolina Lozada-Ávila, Simón Betancur Gómez
Gamification is shown as an alternative for traditional classroom strategies and is increasingly used in higher education. The purpose of the revision is to know the way gamification has brought more interest in the following fields of knowledge in terms of bibliographic production and use: management and economics, arts and humanities, health sciences, natural and exact sciences, social and juridical sciences, engineering, and architecture. Participation was identified according to results in nine academic databases. The field with the highest percentage, based on the scale defined in the methodology, is Engineering and Architecture (3.15), while health sciences obtained 0.49. It is clearly seen that gamification is a field explored in higher education and experiences which have generated its application are different. Setting usage guidelines is recommended, including studies of a bigger scope in order to know its real effects on the learning process.
Multimedia mining: towards the construction of a methodology and a non-structured date analytics tool
Efrain Alberto Oviedo Carrascal, Ana Isabel Oviedo Carrascal, Gloria Liliana Velez Saldarriaga
This research addresses the development of multimedia mining projects by applying analytical techniques to texts, images, audio, and video. In order to develop these projects, a methodology to develop multimedia mining projects (Multimedia Analytical Methodology-MAM) is proposed. Likewise, the construction of a software tool (known as Multimedia Analytical Platform-PAM) which allows the analysis of multimedia mining is introduced. Methodology and platform are evaluated with two study cases on prediction of mammography abnormalities and analysis of medical imaging similarity. Results obtained allowed validating the steps proposed in the MAM methodology and using the PAM platform to extract the characteristics of medical images, to apply data mining techniques, and to satisfactorily evaluate the results obtained.
Cloud Computing is an ubiquitous model that enables clients to access different services in a fast and easy manner. In this context, one of the most used models is Software as a Service (SaaS), which means that software is deployed and provisioned to the customer via internet through a web browser on a pay per use mode. However, given its complexity and characteristics, such as reusability, scalability, flexibility and customization, SaaS may be defined by workflows, which consist of atomic services, or micro-services hosted geographically in different places. SaaS execution under this type of composition may lead to abnormal behavior or failures in the end user applications at runtime. This paper presents a new model of dynamic orchestration for SaaS, which aims to reduce failures or abnormal behavior of the services involved in the execution process of business application.
Definition of a model for personal financial planning applied to the Colombian case
Miguel David Rojas López, Lina Marcela Maya Fernández, María Elena Valencia Corrales
Personal financial planning is a set of activities required for defining objectives, setting action plans, and satisfying financial needs of individuals. Different authors represent the personal financial planning process through models, indicating disadvantages to apply them in the Colombian environment since they have been created in developed countries; they suppose the existence of a financial planning industry and there are no academic studies which adapt them to meet the inherent needs of the environment. In order to solve such disadvantages, this research proposes the definition of a unifying personal financial planning model which embraces different elements that are identified from studied models, applicable in the Colombian environment.
Integration proposal of the model for the construction of solutions and the Canvas business model for the development of telematic systems
Diego Fernando Burbano Santacruz, Eduardo Rojas Pineda
This article is the result of a research. It proposes a reference framework for using the Canvas Business Model in conjunction with the Solutions Construction Model for the development of telematics systems. By using the CBM and its translation for the modeling of UML-based business and the Rational Unified Process (RUP) guidelines, understanding process of the organizational context where the solution will operate and dialogue between the interested parties becomes easier. Optionally, the use of the Minimum Viable Product (MVP) is proposed, as defined in the Lean Startup, as complement to the idea of operating the solution scenario before going forward to the construction stages. The reference framework was tested with the development of a telematics solution for the Scho ol of Health Sciences of Universidad del Cauca, showing its advantages and facilitating developers and customers a better understanding of the organizational context and the evolution and definition of the solution to be constructed.
Green distribution center model: environmentally friendly and operational efficiency using a process approach and a taboo search metaheuristics
Rodrigo Andres Gomez Montoya, Alexander Alberto Correa Espinal, José Daniel Hernandez Vahos
This article is intended to develop and validate a green distribution center model consisting of three components: a management module; a warehouse management system (WMS); and a metaheuristics. As a result of the validation of the model at a Distribution Center of a medium-size food company, a reduction of CO2 emissions was achieved, equivalent to 731 kg/month or 37% of issues for preparation of orders. Additionally, the modeling of a Taboo Search metaheuristics was developed to resolve the routing problem for the preparation of orders; this allowed increasing the operation efficiency in about 18.83% and to obtain a reduction of 198 kg of equivalent CO2 per month. Therefore, the green distribution center model, simultaneously, increased the efficiency and reduced the amount of kilograms of CO2, using an approach that had not been addressed in literature for this logistic process.
This research was conducted with the project Characterization of the executive component in operational staff of Huila hydrocarbon sector, 2012. The objective was to describe the executive component of 35 operators belonging to such population. One of the difficulties is the improper management of protective elements by the operational staff; this implies a need for having valuation instruments in staff recruitment processes which allow identifying anticipation, planning, and flexibility skills needed to avoid risk conducts and promote preventive behavior. The results of the neuropsychological assessment showed difficulties for sustained attention processes, central executive system, inhibitory control, and cognitive flexibility. It was concluded that knowledge is not sufficient for the improper use of protective elements but the metacognitive functioning to regulate the behavior of the individuals in order to keep themselves safe.
Technical and economic analysis for the incorporation of Facts in power systems
Jose David Gomez Jimenez, Guillermo Enrique Vinasco Macana, Jesus Maria Lopez Lezama
This article shows a methodology for the technical and economic analysis of the incorporation of Facts devices in electrical power systems. The methodology proposed consists of a deterministic stage and a stochastic stage which involve aspects of technical and economic feasibility, respectively. The first stage is based on a non-linear binary mixed programming model developed at AMPL in order to minimize generation of safety given the location of a Facts device. The second stage employs an energetic model based on a stochastic dynamic dual programming (SDDP) which determines the cost-benefit ratios of the incorporation of Facts for different hydrothermal series. In order to illustrate the applicability of the methodology proposed, a case study is shown in the Colombian electrical system, taking into account the incorporation of a Statcom in the Atlantic Coast. Additionally, it is shown that the solution proposed resolves oscillatory instability problems of power, identified in minimum generation scenarios before critical contingencies.