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Prof. David Ovallos
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Journal article
Published: 29 July 2020 in Sustainability
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Scientific and business environment literature shows that green, sustainable innovation or eco-innovation has proven to be a source of competitive advantage today. The industrial clusters, their dynamism, and the synergies created within them attract a lot of attention from the scientific community. However, to date, the joint study of these two concepts and, more specifically, the factors that drive eco-innovation specifically in a cluster, have not been studied in depth. This article models eco-innovation in industrial clusters, thus addressing this gap and proposing a model based on information gathered from the literature and a detailed analysis of behavior in relation to eco-innovation in different sectors. Results suggest that including eco-innovation variables and measures may have positive implications such as improvements at the strategic level and the reduction of costs and use of resources. An eco-innovation model for clusters is proposed. It considers eight key factors that seek to raise its competitive level by promoting eco-innovation within clusters. The model includes five internal factors that analyze business capabilities and three external factors that study the effect of launching eco-innovative activities. This model could help the companies’ managers and those responsible for clusters in creating more successful strategies to increase competitiveness by enhancing eco-innovation. It could also serve as a guide for government entities in the performance of eco-innovative activities in economic sectors.

ACS Style

Nohora Mercado-Caruso; Marival Segarra-Oña; David Ovallos-Gazabon; Angel Peiró-Signes. Identifying Endogenous and Exogenous Indicators to Measure Eco-Innovation within Clusters. Sustainability 2020, 12, 6088 .

AMA Style

Nohora Mercado-Caruso, Marival Segarra-Oña, David Ovallos-Gazabon, Angel Peiró-Signes. Identifying Endogenous and Exogenous Indicators to Measure Eco-Innovation within Clusters. Sustainability. 2020; 12 (15):6088.

Chicago/Turabian Style

Nohora Mercado-Caruso; Marival Segarra-Oña; David Ovallos-Gazabon; Angel Peiró-Signes. 2020. "Identifying Endogenous and Exogenous Indicators to Measure Eco-Innovation within Clusters." Sustainability 12, no. 15: 6088.

Journal article
Published: 26 June 2020 in Heliyon
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Aluminum sulfate is one of the most used chemical coagulants in the world, but research has shown that high concentrations of aluminum in the body are associated with neuropathological conditions. Because of this, different alternatives have been evaluated such as natural coagulants, which are considered safe for human health and contain fewer contaminants than chemicals due to their biodegradation properties. The main objective of this study was to evaluate the efficiency of mixing nopal mucilage and cassava starch for turbidity removal in water purification. In this paper, test jars and the treatment equipment (TA-scale FQ-005/PE manufactured by Generatoris SA de CV of Mexico) was applied in order to measure turbidity and pH parameters before and after the process of coagulation–flocculation, which was applied to water from the Magdalena River in Colombia. Samples from two sampling periods were assessed. One was evaluated during the rainy season and the other was evaluated without precipitation (drought) with initial turbidities of 316 NTU and 80 NTU, respectively. It was found that aluminum sulfate as a coagulant reference obtained better turbidity removal results (up to 99%) as compared to nopal (up to 60.4%), and nopal–starch combination of cassava (up to 67%), indicating that this mixture increases the effectiveness of natural coagulants used individually. Our results indicate that this should be considered as an alternative in the water purification process.

ACS Style

José Lugo-Arias; Elkyn Lugo-Arias; David Ovallos-Gazabon; Juan Arango; Mario de la Puente; Jesús Silva. Effectiveness of the mixture of nopal and cassava starch as clarifying substances in water purification: A case study in Colombia. Heliyon 2020, 6, e04296 .

AMA Style

José Lugo-Arias, Elkyn Lugo-Arias, David Ovallos-Gazabon, Juan Arango, Mario de la Puente, Jesús Silva. Effectiveness of the mixture of nopal and cassava starch as clarifying substances in water purification: A case study in Colombia. Heliyon. 2020; 6 (6):e04296.

Chicago/Turabian Style

José Lugo-Arias; Elkyn Lugo-Arias; David Ovallos-Gazabon; Juan Arango; Mario de la Puente; Jesús Silva. 2020. "Effectiveness of the mixture of nopal and cassava starch as clarifying substances in water purification: A case study in Colombia." Heliyon 6, no. 6: e04296.

Journal article
Published: 07 February 2020 in Social Sciences
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This study makes a systemic review to cluster and create a competitiveness relationship considering a systems dynamics approach. A dynamic hypothesis was constructed to validate what factors increase a cluster’s level of competitiveness, through causal analysis. Then, the causal diagram that validates the dynamic H0 hypothesis was constructed in Vensim PLE systems®. Literature review shows the evolution of the cluster system according to the current needs of the market, and emphasizes the need for new approaches and models that capture the complexity and dynamics of this system, allowing the understanding of its structure and the evaluation of the contribution of factors and capabilities to cluster competitiveness. It highlights the usefulness of systems dynamics as a simulation methodology for dynamic and complex systems, and establishes itself as a growing line of research applied to various systems of study. Dynamic hypothesis H0 was validated using the causal diagram, reaching the conclusion that innovation, productive management, financial management, organizational management, commercial management, and cluster management factors positively increase the cluster competitiveness level. From structure analysis, the behavior is associated to the archetype “Path Dependence”, usual in growing industrial markets.

ACS Style

Sindy Martínez-Marín; Nataly Puello-Pereira; David Ovallos-Gazabon. Cluster Competitiveness Modeling: An Approach with Systems Dynamics. Social Sciences 2020, 9, 12 .

AMA Style

Sindy Martínez-Marín, Nataly Puello-Pereira, David Ovallos-Gazabon. Cluster Competitiveness Modeling: An Approach with Systems Dynamics. Social Sciences. 2020; 9 (2):12.

Chicago/Turabian Style

Sindy Martínez-Marín; Nataly Puello-Pereira; David Ovallos-Gazabon. 2020. "Cluster Competitiveness Modeling: An Approach with Systems Dynamics." Social Sciences 9, no. 2: 12.

Journal article
Published: 26 December 2019 in Heliyon
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Water purification is indispensable to guarantee safe human consumption and to prevent diseases caused by the ingestion of contaminated water. This requires a series of water treatment processes which require investment. However, the economic limitations of rural communities hinder their ability to implement such water-treatment systems, as is the case in Ciénaga Grande of Santa Marta ("Large Swamp", in English) in Colombia. Low-cost systems can be used instead as simple and safe alternatives. Therefore, the objective of this work was to evaluate non-conventional, low-cost water processes to purify the water from the collection point of two stilt house villages in Ciénaga Grande of Santa Marta. These include: 1) Using two natural coagulants, Moringa Oleifera and Cassia Fistula; 2) filtration through a biosand filter and a carbon activated filter; and 3) disinfection through UV-C Radiation and through solar disinfection. The results showed a turbidity values reduction between 52% and 96% using the two natural coagulants; both turbidity and total coliforms achieved reductions of 98.4% and 76.9%, respectively in the filtration process; and removal of total coliforms up to 98.8% in the disinfection process. Despite the high rates of reduction in the different parameters, the water does not comply with the recommended limits for safe drinking water.

ACS Style

José Lugo-Arias; Javier Burgos-Vergara; Elkyn Lugo-Arias; Audrey Gould; David Ovallos-Gazabon. Evaluation of low-cost alternatives for water purification in the stilt house villages of Santa Marta's Ciénaga Grande. Heliyon 2019, 6, e03062 .

AMA Style

José Lugo-Arias, Javier Burgos-Vergara, Elkyn Lugo-Arias, Audrey Gould, David Ovallos-Gazabon. Evaluation of low-cost alternatives for water purification in the stilt house villages of Santa Marta's Ciénaga Grande. Heliyon. 2019; 6 (1):e03062.

Chicago/Turabian Style

José Lugo-Arias; Javier Burgos-Vergara; Elkyn Lugo-Arias; Audrey Gould; David Ovallos-Gazabon. 2019. "Evaluation of low-cost alternatives for water purification in the stilt house villages of Santa Marta's Ciénaga Grande." Heliyon 6, no. 1: e03062.

Conference paper
Published: 09 October 2019 in Communications in Computer and Information Science
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For this study, articles from the fields of Social Sciences; Economics; Econometrics and Finance; Business and Management; and Accounting have been monitored for the period from 1979 to 2019. VOSviewer® was used to create, visualize and explore bibliometric information from Scopus scientific database, for the identification of trends about indicators that have not been frequently considered, compared to competitiveness regional indexes territorial competitiveness indicators. It has generated preliminary conclusions using citation relationships between journals, collaborative relationships between researchers, and coexistence relationships between scientific terms from the identified target literature. The identified trends are related to Renewable energy, Sustainability, Higher Education, Destination Competitiveness, Knowledge Management, Cross Borders Regions and Small and Medium-sized Entrepreneurship.

ACS Style

David Ovallos-Gazabon; Nataly Puello-Pereira; Farid Meléndez-Pertuz; Jaime Vélez-Zapata; Emiro De-La-Hoz-Franco; Joaquín F. Sanchez; Claudia Caro-Ruiz; César A. Cárdenas; Carlos Collazos-Morales. Using Text Mining Tools to Define Trends in Territorial Competitiveness Indicators. Communications in Computer and Information Science 2019, 676 -685.

AMA Style

David Ovallos-Gazabon, Nataly Puello-Pereira, Farid Meléndez-Pertuz, Jaime Vélez-Zapata, Emiro De-La-Hoz-Franco, Joaquín F. Sanchez, Claudia Caro-Ruiz, César A. Cárdenas, Carlos Collazos-Morales. Using Text Mining Tools to Define Trends in Territorial Competitiveness Indicators. Communications in Computer and Information Science. 2019; ():676-685.

Chicago/Turabian Style

David Ovallos-Gazabon; Nataly Puello-Pereira; Farid Meléndez-Pertuz; Jaime Vélez-Zapata; Emiro De-La-Hoz-Franco; Joaquín F. Sanchez; Claudia Caro-Ruiz; César A. Cárdenas; Carlos Collazos-Morales. 2019. "Using Text Mining Tools to Define Trends in Territorial Competitiveness Indicators." Communications in Computer and Information Science , no. : 676-685.

Conference paper
Published: 29 June 2019 in Transactions on Petri Nets and Other Models of Concurrency XV
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Evaporation is a process that is widely used in the chemical industry and aims to concentrate a solution consisting of a non-volatile solute and a volatile solvent. In this paper the design of robust control systems for a simple effect evaporation system is presented. Two controllers were designed, the first was based on the Algebraic Riccati Equations (ARE) solutions technique and the second was derived from the D-K iteration method. To show the potentiality of the control system proposed, we present the results of some tests carried out in simulation.

ACS Style

Javier Jiménez-Cabas; Farid Meléndez-Pertuz; David Ovallos; Jaime Vélez-Zapata; Hermes E. Castellanos; César A. Cárdenas; Joaquín F. Sánchez; Gonzalo Jimenez; César Mora; Fredy A. Sanz; C. A. Collazos. Robust Control of an Evaporator Through Algebraic Riccati Equations and D-K Iteration. Transactions on Petri Nets and Other Models of Concurrency XV 2019, 731 -742.

AMA Style

Javier Jiménez-Cabas, Farid Meléndez-Pertuz, David Ovallos, Jaime Vélez-Zapata, Hermes E. Castellanos, César A. Cárdenas, Joaquín F. Sánchez, Gonzalo Jimenez, César Mora, Fredy A. Sanz, C. A. Collazos. Robust Control of an Evaporator Through Algebraic Riccati Equations and D-K Iteration. Transactions on Petri Nets and Other Models of Concurrency XV. 2019; ():731-742.

Chicago/Turabian Style

Javier Jiménez-Cabas; Farid Meléndez-Pertuz; David Ovallos; Jaime Vélez-Zapata; Hermes E. Castellanos; César A. Cárdenas; Joaquín F. Sánchez; Gonzalo Jimenez; César Mora; Fredy A. Sanz; C. A. Collazos. 2019. "Robust Control of an Evaporator Through Algebraic Riccati Equations and D-K Iteration." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 731-742.