Enfoque UTE

15 - 24

Authors: Fabián Ortiz Terán, Bolívar Haro Haro

This research focusses on characterizing the sick building syndrome (SBS) on three buildings of the Engineering Sciences Faculty, at the Occidental Campus of the Universidad Tecnológica Equinoccial. By means of a comparative analysis between the prevalence result obtained within the research work and a comparison with the allowable levels according to NTP290 Spanish Code, determination was made that, in effect SBS exists in the studied buildings. The physical risk questionnaire was applied to the universe of studied people (N=64). Based on the results and in accordance to the prevalence appraisal, a proposal was formulated for the remediation of the involved working conditions on the studied buildings. This research will serve as an institutional reference for the building quality indicator of the University facilities and also for future researches.

44 - 58

Authors: Idalberto Tamayo Ávila, Luis Geovanny Pazmiño Bravo, Diego Fabián Valencia Alvear, Mayra Maiuxi Galván Paredes, Marcos Antonio Batista Zaldívar

In this work is reported an initiative to implement 24 assembly laboratories for General Physics, Applied Physics and Heat and Electromagnetism, in the premises of the Universidad Tecnológica Equinoccial (Santo Domingo, Ecuador). For this purpose three student memoires where designed and performed with unused, stored equipment, plus some additional material coming from students contribution. Each practice was set up and validated for teaching purposes with the methods of calculation errors and linear regression. This work saved the institution $16,369.57 compared with the cost of buying a commercial set for the laboratory.

77 - 85

Authors: Mairett Rodríguez-Balza, Luis Pérez-Ybarra, William Quintana-Rivero

An empirical rule is proposed for determining the sample size n to be taken depending on the lot produced size N for a single attributes sampling under normal inspection based on the standards COVENIN 3133-1: 2001 and MIL-STD-105E; also, the acceptance number c for a given level of acceptable quality was calculated, and the corresponding operating characteristic curves were constructed. Two potential regression equations were obtained for calculation of sample size to fit R2 of 99.91% and 99.38% for lot sizes N≤666 and N>666, respectively, in addition, a sampling plan was designed for a lot size of 176,000 units with an acceptable level of quality of 0.65% defectives units. The proposed sampling plan presented a smaller sample size (n=560) than the standard (n=800), with operating characteristic curve very similar to the closest sampling plan recommended by the standard (n=500). The application of the empirical approach is recommended for the design of cheaper sampling plans which in turn are consonant with the rules COVENIN 3133-1: 2001 and MIL-STD-105E

102 - 116

Authors: Julio C. Caiza, Danny S. Guamán, Gabriel R. López

Software development is an activity, inherently collaborative; usually development teams have members located in different places, talking different languages and with another culture. Therefore, knowledge about helping tools is necessary. These tools could be helpful in the whole process of software development, and mainly in the coding stage. This paper shows new perspectives in collaborative software development, its relevance; then, shows a set of important tools. They include plugins and web-based tools. A set of important features and a comparison are shown. This information would be helpful if you are thinking about build or use one.

13 - 24

Authors: Yusimit Zamora Hernández, Yoandrys Morales Tamayo, Arlys Lastre Aleaga, Roberto Beltrán Reyna

The continuous improvement of manufacturing processes is critical to achieve optimum levels of productivity, quality and cut production of components and products. This research aims to determine the cutting tool flank wearing progression, during a high speed dry turning, for AISI 316L steel parts. Experimental data were acquired using two cutting feed levels, two material levels, three cutting speeds, and four principal cutting times. A scanning electron microscope (SEM) was used to measure and analyze the wear of the cutting tools. Results were compared using analysis of variance and multiple regression for describing the relation between the variables used in the study. The analysis showed that the three layers coating insert did not exceed the end of life wearing criterion, while the one layer insert suffered a catastrophic wearing at the highest cutting speed. It was found that a relation exists between the experimental data and the predicted values for flank wear with a general average error of 4.1182%.

35 - 44

Authors: Yasnalla Rivero Peña, Pavel Novoa Hernández, Yandi Fernández Ochoa

In this research a mathematical model to approach the process of creating software development teams as a discrete multi-objective problem is proposed. The objectives considered are the level of competition and the level of utilization of professionals in the team. Given the complexity of the problem search space, the application of an approximate optimization method is proposed. Specifically, the genetic algorithm NSGA-II based on the concept of Pareto dominance was selected. This method was applied in six different scenarios in order to analyze the quality of the obtained solutions. In general we can say that the method is efficient and gets solutions (assignments) of high quality.

55 - 70

Authors: Adrián Moreno Vaca, Priscila Maldonado Pacheco

A kind of chicken sausage “Swiss type” was developed with avocado oil content to replace all fat from pork back fat in its formulation. Analysis of lipid profile for pork back fat reported: SFA 35.45 %; MUFA 41.95 %; PUFA 20.71 %. For avocado oil: SFA 18.66 %; MUFA 68.37 %; PUFA 12.19 % . Treatments used which corresponding to the percentages of avocado oil content as a substitute for pork back fat in their formulation were: T1 = 50 %, T2 = 75 %, T3 = 100 %. Sensory acceptability of treatments was performed. There were no statistically significant differences. Treatment T3 with highest score was chosen as the best treatment. Physicochemical and microbiological characterization was performed for T3 treatment and for a treatment which didn’t have in its formulation avocado oil, T0 treatment. T0. Protein was 13.23% in T0 and 12.56% in T3. Total fat, SFA and PUFA in T3 were reduced in 3.7%, 5.24% and 2.53% respectively. MUFA showed an increase of 3.51% in T3. Trans acids was 0% for both treatments. The results obtained were located within the acceptable range established in the NTE (INEN) 1338:12.

17 - 33

Authors: José Antonio Morales Castro

This work evaluated the business risk change of 20 companies included on the sustainable index of the Mexican Stock Exchange (BMV). The unlevered beta coefficient was used for this analysis. Two periods were compared: the one before, and the one after including the companies on the index. For each of the 20 companies it was used financial information, stocks closing prices and the stock market index value, over a period of 234 weeks. Then, considering the two periods, the statistical difference between the unlevered beta coefficient averages was calculated. Finally, a hypothesis proof was made to evaluate the business risk change. It was found that for 12 out of the 20 companies, the unlevered beta coefficient suffered a reduction. The findings suggest that it is not enough for the companies to certify as sustainable in order to reduce its business risk.

54 - 69

Authors: Elena Beltrán, María Belén Jácome, Edison Matute

The aim of this study was to obtain a flavored green tea with organic rose petals "Vitality" from Nevado Ecuador. Green tea, purchased from a private company, it was subjected to analysis to verify compliance with the requirements of standard INEN 2381: 2005. The Characterization of fresh rose petals was to made and for the dehydration was used two temperatures and two geometries. Analysis of total polyphenol content (Folin-Ciocalteu) and antioxidant capacity (TEACmethod) were performed. The dried petals, with a higher content of polyphenols and antioxidant capacity, were used in the preparation to flavored tea. Three formulations with different amounts of dried rose petals (10, 17.5 and 25%) were tested sensorially by 100 judges to determine the aroma rose in the tea. The final product was analyzed to determine compliance of the requirements of the standard INEN of the tea. Finally acceptability and purchase intention of the product is evaluated. The values of content total polyphenol in the extracts of rose petals were superior to fruits such as blackberries, and strawberries.

89 - 98

Authors: Idalberto Tamayo Ávila, Ivanna Guamán Tumaille, Yandi Fernández Ochoa, Nilo Ortega Soliz

In this paper the presence of electric charge in two insulation of cross-linked polyethylene (XLPE) in medium voltage cables was compared using the technique of Thermally Stimulated Depolarization Currents (TSDC). Antioxidant in solid form was added to one of the insulation, and in liquid form to the other. By analyzing the TSDC measures we verified that the use of liquid antioxidant is better because the solid antioxidant creates defects that act as centers for trapping the space charge. In these centers the ionized charge, by the combined effect of temperature and electric field, is accumulated in the insulation, in addition to the charge injected from the semiconductor electrodes by the effect of high fields.

15 - 24

Authors: Manuel Coronel

One of the largest areas of the food industry is the production of snacks, but these have generally an inadequate nutritional profile in healthy eating. The vacuum frying technology is presented as a clear option processing for the development of new products and existing ones. This review article presents the advantages of using technology in Vacuum frying different types of food, especially in relation to the contents of some micronutrients and fat. They also mention the work done in Ecuador, especially in local products.

45 - 56

Authors: Eduardo Tusa, Alan Reynolds, Neil Robertson, David Lane, Hyxia Villegas, Antonio Bosnjak

This work focuses on developing a fast coral reef detector, which is used for an autonomous underwater vehicle, AUV. A fast detection secures the AUV stabilization respect to an area of reef as fast as possible, and prevents devastating collisions. We use the algorithm of Purser et al. (2009) because of its precision. This detector has two parts: feature extraction that uses Gabor Wavelet filters, and feature classification that uses machine learning based on Neural Networks. Due to the extensive time of the Neural Networks, we exchange for a classification algorithm based on Decision Trees. We use a database of 621 images of coral reef in Belize (110 images for training and 511 images for testing). We implement the bank of Gabor Wavelets filters using C++ and the OpenCV library. We compare the accuracy and running time of 9 machine learning algorithms, whose result was the selection of the Decision Trees algorithm. Our coral detector performs 70ms of running time in comparison to 22s executed by the algorithm of Purser et al. (2009).

14 - 28

Authors: Mónica Arteaga Dalgo, María José Andrade Cuvi, Carlota Moreno Guerrero

The relationship between color development with anthocyanins and chlorophyll content at different stages of maturity of mortiño (Vaccinum floribundum) was studied. The fruits were harvested by surface color from 100% green to 100% black. The color scale was measured according to CIE L* a* b* and color difference (∆E) was determined. The anthocyanin and chlorophyll content was performed by UV-VIS spectrophotometry. The following scale was used to establish the stage of maturity: (1) green, (2) green/pink, (3) pink, (4) pink/black and (5) black; It was observed that increasing the maturation stage, the brightness and color saturation decrease. Results showed positive values of a* and negative of b* for maturity stages 3, 4 and 5 (red and blue); and negative values ​​of a * and positive of b * for states 1 and 2 (green and yellow). Smallest differences in color (∆E) were found between states 4 and 5. Among the states 1 and 5 was evident a decreased of 0,052 mg/g in chlorophyll content and an increase of 13700mg/kg in anthocyanins. The degree of maturity of the fruit has a direct relationship between the color tone and content of components with antioxidant activity constituting a precedent for future researches and its use of this fruit in different stages of maturity.

38 - 58

Authors: Marcia M. Lastre Valdes, Arlys M. Lastre Aleaga, Gelmar García Vidal

In this paper a review and analysis of the major theories and models that address the prediction of corporate bankruptcy and insolvency is made. Neural networks are a tool of most recent appearance, although in recent years have received considerable attention from the academic and professional world, and have started to be implemented in different models testing organizations insolvency based on neural computation. The purpose of this paper is to yield evidence of the usefulness of Artificial Neural Networks in the problem of bankruptcy prediction insolence or so compare its predictive ability with the methods commonly used in that context. The findings suggest that high predictive capabilities can be achieved using artificial neural networks, with qualitative and quantitative variables.