PubMed | S.A. de C.V., Sonora Institute of Technology, University of Sonora and Zacatecas Institute of Technology
Type: | Journal: BioMed research international | Year: 2015
The future development of shrimp farming needs to improve its ecoefficiency. The purpose of this study was to evaluate water quality, flows, and nitrogen balance and production parameters on a farm with interconnected pond design to improve the efficiency of the semi-intensive culture of Litopenaeus vannamei ponds. The study was conducted in 21 commercial culture ponds during 180 days at densities of 30-35 ind m(-2) and daily water exchange <2%. Our study provides evidence that by interconnecting ponds nutrient recycling is favored by promoting the growth of primary producers of the pond as chlorophyll a. Based on the mass balance and flow of nutrients this culture system reduces the flow of solid, particulate organic matter, and nitrogen compounds to the environment and significantly increases the efficiency of water (5 to 6.5 m(3) kg(-1) cycle(-1)), when compared with traditional culture systems. With this culture system it is possible to recover up to 34% of the total nitrogen entering the system, with production in excess of 4,000 kg ha(-1) shrimp. We believe that the production system with interconnected ponds is a technically feasible model to improve ecoefficiency production of shrimp farming.
Esquivel A.,Zacatecas Institute of Technology |
Haya P.,Instituto de Ingeniería del Conocimiento |
Alaman X.,Autonomous University of Madrid
Sensors (Switzerland) | Year: 2015
This paper presents a proof of concept from which the metaphor of “fair trade” is validated as an alternative to manage the private information of users. Our privacy solution deals with user’s privacy as a tradable good for obtaining environmental services. Thus, users gain access to more valuable services as they share more personal information. This strategy, combined with optimistic access control and transaction registry mechanisms, enhances users’ confidence in the system while encouraging them to share their information, with the consequent benefit for the community. The study results are promising considering the user responses regarding the usefulness, ease of use, information classification and perception of control with the mechanisms proposed by the metaphor. © 2015 by the authors; licensee MDPI, Basel, Switzerland.
PubMed | Autonomous University of Madrid, Instituto de Ingeniería del Conocimiento and Zacatecas Institute of Technology
Type: Journal Article | Journal: Sensors (Basel, Switzerland) | Year: 2015
This paper presents a proof of concept from which the metaphor of fair trade is validated as an alternative to manage the private information of users. Our privacy solution deals with users privacy as a tradable good for obtaining environmental services. Thus, users gain access to more valuable services as they share more personal information. This strategy, combined with optimistic access control and transaction registry mechanisms, enhances users confidence in the system while encouraging them to share their information, with the consequent benefit for the community. The study results are promising considering the user responses regarding the usefulness, ease of use, information classification and perception of control with the mechanisms proposed by the metaphor.
PubMed | Mexican Institute of Social Security IMSS, Autonomous University of San Luis Potosi and Zacatecas Institute of Technology
Type: Journal Article | Journal: Clinical immunology (Orlando, Fla.) | Year: 2015
Regulatory T cells (Tregs), a subset of CD4+ T cells related with immune regulation, have been associated with active and latent tuberculosis infection (LTBI). Treg frequencies were evaluated by multicolor flow cytometry (FC) in peripheral blood mononuclear cells (PBMCs) stimulated with mycobacterial antigens ESAT-6, CFP-10, and TB7.7 to assess their capacity to distinguish subjects with different reactivity to the QuantiFERON-TB Gold In-Tube (QFT-IT) test and the tuberculin skin test (TST). Increased frequencies of CD4+CD25highCD39+ cells were found for the [TST+, QTF+] compared with the [TST+, QTF-] group. Also, higher frequencies were observed for the [TST+, QTF+] compared with the [TST+, QTF-] and [TST-, QTF-] groups in CD4+CD25highFoxp3+ and CD4+CD25highCD39+Foxp3+ populations. Receiver operating characteristics (ROC curve) analysis confirmed these discriminating results. QFT-IT and TST quantitative values correlated with several Treg population frequencies.
Galvan-Tejada C.E.,Autonomous University of Zacatecas |
Galvan-Tejada J.I.,Autonomous University of Zacatecas |
Celaya-Padilla J.M.,Autonomous University of Zacatecas |
Delgado-Contreras J.R.,Zacatecas Institute of Technology |
And 2 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016
Due to an increase interest for providing services based on user location, several indoor location approaches based on mobile devices have been proposed recently. This paper focuses on the use of a novel crowdsourcing approach for indoor location of a mobile device that uses social collaboration to improve the accuracy and magnetic field signal as information source using feature extraction and a deterministic method that allows us to include information from new users that improves the fitness of the model. Four phases were included in the methodology: Raw data collection, Data pre-process, Feature extraction and Social collaboration. An experiment was succesfully carried out to test the proposed methodology. On the whole, good results were obtained on computational cost, recalculation time and accuracy improvement. © Springer International Publishing Switzerland 2016.
Delgado-Contreras J.R.,Zacatecas Institute of Technology |
Delgado-Contreras J.R.,Monterrey Institute of Technology |
Garcia-Vazquez J.P.,Autonomous University of Baja California |
Brena R.,Monterrey Institute of Technology
2016 International Conference on Electronics, Communications and Computers, CONIELECOMP 2016 | Year: 2016
One of the many possible sources for identifying a place is environmental sound. Ambient sound can be used by itself or in combination with other methods, like GPS, WiFi, etc. A way of identifying a place with sound is using "fingerprinting", which tries to match features of sound in similar places with the one being registered. Nevertheless, one of the many parameters in this process relates to the length of the audio both for the patterns and for the current recording. Several authors use a given time length (e.g. 10, 15, 30 seconds; however, they fail to provide any justification about the time length of the audio fingerprint for creating their classification models. In this paper, we propose to optimize the time length for classifying an environmental audio signal and for increasing the accuracy of the our classification model that uses support vector machine (SVM) as a classifier, and we perform an experimental evaluation. Our results show that the length of environmental audio signal should be between 30 and 40 seconds to get a model with 94.28 % of accuracy. © 2016 IEEE.
Delgado-Guillen L.A.,Zacatecas Institute of Technology |
Garcia-Hernandez J.J.,CINVESTAV |
Midwest Symposium on Circuits and Systems | Year: 2013
This paper presents an strategy for watermarking on color images using a mobile phone. In the proposed scheme a digital watermark is inserted into a color image and can be retrieved after a digital-analog (D/A) and analog-digital (A/D) conversion process. Moreover, the proposed system is able to detect the watermarks after desycronization attacks such as rotation, scaling and translation. For the detection, the Neyman-Pearson criterion is utilized for the selection of a threshold, which consists in minimizing the overall error probability when the watermark is not actually present. Experimentation results show the effectiveness of the proposed approach. © 2013 IEEE.
Zegbe J.A.,INIFAP Campo Experimental Zacatecas |
Mena-Covarrubias J.,INIFAP Campo Experimental Zacatecas |
Dominguez-Canales V.S.I.,Zacatecas Institute of Technology
Acta Horticulturae | Year: 2015
Annual pruning of cactus pear cladodes provides an opportunity for adding value to this crop by extracting mucilage from which to create edible films and coatings for perishable fruits such as guavas (Psidium guajava L.). The objective of this research was to create mucilage films and assess their effects on quality and shelf life of guava cultivar 'Media China'. Cactus pear cladodes were peeled, cubed, and homogenized in distilled water. Mucilage was precipitated using ethanol, then dried and ground. The experimental films tested were: no films as control (C), mucilage plus glycerol (T1), and mucilage plus glycerol and polyethylene glycol (T2). Two experiments were conducted with two different concentrations of mucilage, glycerol, and polyethylene glycol. Guavas were harvested from local farmers and treated with a fungicide before coating. The treated fruit was stored for eight or six days at room temperature (28°C and 20% RH or 27°C and 20% RH, respectively). In the first trial, the T2 film increased fruit weight loss more than C and TI film. Both films delayed fruit skin colour and maintained higher firmness (F), total soluble solids concentration (TSSC), and dry matter concentration (DMC) than C fruit. In the second trial, T1 and T2 films reduced fruit weight loss and delayed fruit skin colour more than C fruit. Firmness, TSSC, and DMC of fruit were similar among treatments. Overall, the experimental mucilage films showed a tendency to prolong shelf life and maintain some quality attributes of guava. Further research is needed to understand the mucilage potential as an edible film at cold room conditions. © 2015, International Society for Horticultural Science. All rights reserved.
Mejia J.,Unidad University |
Garcia A.,Zacatecas Institute of Technology |
Munoz M.A.,Unidad University
Advances in Intelligent Systems and Computing | Year: 2013
Software development outsourcing is now a reality in both international and national organizations because it represents a competitive strategy. However, even when organizations recognize in the outsourcing competitiveness and business strategy, the software development projects in outsourcing enviroments fails due to the inadequate project management. Therefore, this paper presents a proposal of how to implement TSPi Methodology to manage software project in outsourcing environment. To achieve this, the main failure factors in software development in outsourcing environments are identified and a traceability to identify the adaptability of TSPi to this environment is showed. © 2013 Springer-Verlag.
Del Consuelo Arguelles Arellano M.,Zacatecas Institute of Technology |
Mendez C.A.,Zacatecas Institute of Technology
Computacion y Sistemas | Year: 2014
Mexican customs and practices often influence the rules we must apply in our professional activities, but quite often those customs and practices are far from reality or Mexico laws. The professional life of a developer of computer programs (software), data and information bases has many challenges to overcome, one of which is to remain within the ethics of "ought" and to apply the principle "respect for the law." Tackling the issue of law, one of its basic tenets is "ignorance of the law does not exempt you from it." This means that we need to know the federal laws related to computer professionals. In this article we discuss the Federal Copyright Law, the Federal Law of Industrial Property and the Federal Criminal Code relating to the technology boom we are experiencing as well as to licensing and patents.