Propuesta de mejora de los gráficos de control por atributos mediante la metodología de Daudin

Esta Tesis Doctoral se centra en la propuesta de mejora del gráfico por atributos u. Se aplica a este gráfico el muestreo doble propuesto por J.J. Daudin (1992) para el gráfico de la media. Se trata de un caso particular en dos etapas del muestreo múltiple, y el gráfico propuesto recibe el nombre de DS-u. El objetivo de esta Tesis Doctoral es conocer cómo se comporta la metodología de Daudin aplicada al gráfico por atributos u, y si mejora la potencia que ofrece el gráfico u clásico. Para ello se ha programado una aplicación empleando algoritmos genéticos con la cual se han realizado simulaciones que han permitido la obtención de conclusiones. Se ha conseguido mejorar para algunos casos concretos.Pérez Bernabeu, E. (2008). Propuesta de mejora de los gráficos de control por atributos mediante la metodología de Daudin [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/3786Palanci

Multi-Criteria Optimization for Fleet Size with Environmental Aspects

[EN] This research concerns multi-criteria vehicle routing problems. Mathematical models are formulated with mixed-integer programming. We consider maximization of capacity of truck vs. minimization of utilization of fuel, carbon emission and production of noise. The problems deal with green logistics for routes crossing the Western Pyrenees in Navarre, Basque Country and La Rioja, Spain. We consider heterogeneous fleet of trucks. Different types of trucks have not only different capacities, but also require different amounts of fuel for operations. Consequently, the amount of carbon emission and noise vary as well. Companies planning delivery routes must consider the trade-off between the financial and environmental aspects of transportation. Efficiency of delivery routes is impacted by truck size and the possibility of dividing long delivery routes into smaller ones. The results of computational experiments modeled after real data from a Spanish food distribution company are reported. Computational results based on formulated optimization models show some balance between fleet size, truck types, utilization of fuel, carbon emission and production of noise. As a result, the company could consider a mixture of trucks sizes and divided routes for smaller trucks. Analyses of obtained results could help logistics managers lead the initiative in environmental conservation by saving fuel and consequently minimizing pollution.This work has been partially supported by the National Research Center (NCN), Poland (DEC2013/11/B/ST8/04458), by AGH, and by the Spanish Ministry of Economy and Competitiveness (TRA2013-48180- C3-P and TRA2015-71883-REDT), and the Ibero-American Program for Science and Technology for Development (CYTED2014-515RT0489). Likewise, we want to acknowledge the support received by the CAN Foundation in Navarre, Spain (Grants CAN2014-3758 and CAN2015-70473). The authors are grateful to anonymous reviewers for their comments.Sawik, B.; Faulin, J.; Pérez-Bernabeu, E. (2017). Multi-Criteria Optimization for Fleet Size with Environmental Aspects. Transportation Research Procedia. 27:61-68. https://doi.org/10.1016/j.trpro.2017.12.05661682

A neural network approach for chatter prediction in turning

[EN] Machining processes, including turning, are a critical capability for discrete part production. One limitation to high material removal rates and reduced cost in these processes is chatter, or unstable spindle speed-chip width combinations that exhibit self-excited vibration. In this paper, an artificial neural network (ANN) is applied to model turning stability. The analytical stability limit is used to generate a data set that trains the ANN. It is observed that the number and distribution of training points influences the ability of the ANN model to capture the smaller, more closely spaced lobes that occur at lower spindle speeds. Overall, the ANN is successful (>90% accuracy) at predicting the stability behavior after appropriate training.The authors gratefully acknowledge financial support from the UNC ROI program. Elena Perez-Bernabeu and Miguel Selles also acknowledge support from Universitat Politenica de Valencia (PAID-00-17). Additionally, some of the neural net figures and the 10-fold cross validation figures are based on the TikZ codes provided on StackExchange-TeX by various users. Harish Cherukuri would like to thank them for their valuable advice.Cherukuri, H.; Pérez Bernabeu, E.; Sellés, M.; Schmitz, TL. (2019). A neural network approach for chatter prediction in turning. Procedia Manufacturing. 34:885-892. https://doi.org/10.1016/j.promfg.2019.06.1598858923

Strategic analysis between manufacturer’s brand and distributor’s brand of Alicante’s supermarkets

[EN] This Project will analyze the aspects of lineal composition (types of brands, manufacturers…), pricing strategies conducted by the different supermarkets and product prices depending of the brand. We study this by analyzing price dispersion, price analysis by kinds of brands and comparative analysis with the different establishments.[ES] En este proyecto se van a analizar los aspectos relacionados con la composición lineal (tipos de marcas, fabricantes…), las estrategias de precios llevadas a cabo por los distintos supermercados y los precios de los productos dependiendo de las marcas. Todo ello mediante el análisis de dispersión de precios, el análisis de precios por tipos de marcas y el análisis comparativo con los distintos establecimientos.Vañó Gisbert, L.; Pérez Bernabeu, E. (2013). Análisis estratégico entre marca fabricante y marca distribuidor en los supermercados de Alicante. 3C Empresa, Investigación y pensamiento crítico. (16):49-64. http://hdl.handle.net/10251/49685S49641

Social responsibility vs sustainability and development

[EN] This investigation deals with the Social Responsibility or Corporate, based on an important element in a very direct influence on the development of organizations, what are the trends that produce in the market that their products destined for thereupon undertake what could be considered as a suitable Integrated Business Management System CSR and trends nationally, internationally and in the specific area of Valencia.[ES] En la presente investigación se aborda la Responsabilidad Social Empresarial o Corporativa, partiendo de un importante elemento que influye de forma muy directa en el desarrollo de las organizaciones, cuales son las tendencias que se producen en el mercado al que destinan sus productos, para acto seguido acometer lo que podría considerarse como un adecuado Sistema Integral de Gestión Empresarial de RSE y sus tendencias a nivel nacional, internacional y en el ámbito específico de la Comunidad Valenciana.Pérez Bernabeu, E.; Sellés Cantó, MÁ. (2012). Responsabilidad social vs sostenibilidad y desarrollo. 3C Empresa, Investigación y pensamiento crítico. (2):37-44. http://hdl.handle.net/10251/34371S3744

Determining Reliable Solutions for the Team Orienteering Problem with Probabilistic Delays

[EN] In the team orienteering problem, a fixed fleet of vehicles departs from an origin depot towards a destination, and each vehicle has to visit nodes along its route in order to collect rewards. Typically, the maximum distance that each vehicle can cover is limited. Alternatively, there is a threshold for the maximum time a vehicle can employ before reaching its destination. Due to this driving range constraint, not all potential nodes offering rewards can be visited. Hence, the typical goal is to maximize the total reward collected without exceeding the vehicle's capacity. The TOP can be used to model operations related to fleets of unmanned aerial vehicles, road electric vehicles with limited driving range, or ride-sharing operations in which the vehicle has to reach its destination on or before a certain deadline. However, in some realistic scenarios, travel times are better modeled as random variables, which introduce additional challenges into the problem. This paper analyzes a stochastic version of the team orienteering problem in which random delays are considered. Being a stochastic environment, we are interested in generating solutions with a high expected reward that, at the same time, are highly reliable (i.e., offer a high probability of not suffering any route delay larger than a user-defined threshold). In order to tackle this stochastic optimization problem, which contains a probabilistic constraint on the random delays, we propose an extended simheuristic algorithm that also employs concepts from reliability analysis.This work has been partially funded by the Spanish Ministry of Science (PID2019-111100RBC21-C22/AEI/10.13039/501100011033), the Barcelona City Council and Fundacio "la Caixa" under the framework of the Barcelona Science Plan 2020-2023 (grant 21S09355-001), and the Generalitat Valenciana (PROMETEO/2021/065).Herrera, EM.; Panadero, J.; Carracedo-Garnateo, P.; Juan-Pérez, ÁA.; Pérez Bernabeu, E. (2022). Determining Reliable Solutions for the Team Orienteering Problem with Probabilistic Delays. Mathematics. 10(20). https://doi.org/10.3390/math10203788102

Solving the time capacitated arc routing problem under fuzzy and stochastic travel and service times

[EN] Stochastic, as well as fuzzy uncertainty, can be found in most real-world systems. Considering both types of uncertainties simultaneously makes optimization problems incredibly challenging. In this paper we propose a fuzzy simheuristic to solve the Time Capacitated Arc Routing Problem (TCARP) when the nature of the travel time can either be deterministic, stochastic or fuzzy. The main goal is to find a solution (vehicle routes) that minimizes the total time spent in servicing the required arcs. However, due to uncertainty, other characteristics of the solution are also considered. In particular, we illustrate how reliability concepts can enrich the probabilistic information given to decision-makers. In order to solve the aforementioned optimization problem, we extend the concept of simheuristic framework so it can also include fuzzy elements. Hence, both stochastic and fuzzy uncertainty are simultaneously incorporated into the CARP. In order to test our approach, classical CARP instances have been adapted and extended so that customers' demands become either stochastic or fuzzy. The experimental results show the effectiveness of the proposed approach when compared with more traditional ones. In particular, our fuzzy simheuristic is capable of generating new best-known solutions for the stochastic versions of some instances belonging to the tegl, tcarp, val, and rural benchmarks.Spanish Ministry of Science, Grant/Award Number: PID2019-111100RB-C21/AEI/10.13039/501100011033; Barcelona Council and the "la Caixa" Foundation under the framework of the Barcelona Science Plan 2020-2023, Grant/Award Number: 21S09355-001; Generalitat Valenciana,Grant/Award Number: PROMETEO/2021/065Martín, XA.; Panadero, J.; Peidro Payá, D.; Pérez Bernabeu, E.; Juan-Pérez, ÁA. (2023). Solving the time capacitated arc routing problem under fuzzy and stochastic travel and service times. Networks. 82(4):318-335. https://doi.org/10.1002/net.2215931833582

An Efficient COVID-19 Prediction Model Validated with the Cases of China, Italy and Spain: Total or Partial Lockdowns?

[EN] The present work develops an accurate prediction model of the COVID-19 pandemic, capable not only of fitting data with a high regression coefficient but also to predict the overall infections and the infection peak day as well. The model is based on the Verhulst equation, which has been used to fit the data of the COVID-19 spread in China, Italy, and Spain. This model has been used to predict both the infection peak day, and the total infected people in Italy and Spain. With this prediction model, the overall infections, the infection peak, and date can accurately be predicted one week before they occur. According to the study, the infection peak took place on 23 March in Italy, and on 29 March in Spain. Moreover, the influence of the total and partial lockdowns has been studied, without finding any meaningful difference in the disease spread. However, the infected population, and the rate of new infections at the start of the lockdown, seem to play an important role in the infection spread. The developed model is not only an important tool to predict the disease spread, but also gives some significant clues about the main factors that affect to the COVID-19 spread, and quantifies the effects of partial and total lockdowns as well.Sanchez-Caballero, S.; Sellés Cantó, MÁ.; Peydro, MA.; Pérez Bernabeu, E. (2020). An Efficient COVID-19 Prediction Model Validated with the Cases of China, Italy and Spain: Total or Partial Lockdowns?. Journal of Clinical Medicine. 9(5):1-18. https://doi.org/10.3390/jcm9051547S11895Huang, C., Wang, Y., Li, X., Ren, L., Zhao, J., Hu, Y., … Cao, B. (2020). Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. The Lancet, 395(10223), 497-506. doi:10.1016/s0140-6736(20)30183-5Al-qaness Mohammed A. A., Ewees, A. A., Fan, H., & Abd El Aziz, M. (2020). Optimization Method for Forecasting Confirmed Cases of COVID-19 in China. Journal of Clinical Medicine, 9(3), 674. doi:10.3390/jcm9030674Roosa, K., Lee, Y., Luo, R., Kirpich, A., Rothenberg, R., Hyman, J. M., … Chowell, G. (2020). Short-term Forecasts of the COVID-19 Epidemic in Guangdong and Zhejiang, China: February 13–23, 2020. Journal of Clinical Medicine, 9(2), 596. doi:10.3390/jcm9020596Shao, N., Zhong, M., Yan, Y., Pan, H., Cheng, J., & Chen, W. (2020). Dynamic models for Coronavirus Disease 2019 and data analysis. Mathematical Methods in the Applied Sciences, 43(7), 4943-4949. doi:10.1002/mma.6345Sun, K., Chen, J., & Viboud, C. (2020). Early epidemiological analysis of the coronavirus disease 2019 outbreak based on crowdsourced data: a population-level observational study. The Lancet Digital Health, 2(4), e201-e208. doi:10.1016/s2589-7500(20)30026-1Zhao, S., & Chen, H. (2020). Modeling the epidemic dynamics and control of COVID-19 outbreak in China. Quantitative Biology, 8(1), 11-19. doi:10.1007/s40484-020-0199-0Kuniya, T. (2020). Prediction of the Epidemic Peak of Coronavirus Disease in Japan, 2020. Journal of Clinical Medicine, 9(3), 789. doi:10.3390/jcm9030789Coronavirus COVID-19 Global Cases by the Center for Systems Science and Engineeringhttps://github.com/CSSEGISandData/COVID-19Wuhan Lockdown “Unprecedented”, Shows Commitment to Contain Virus: WHO Representative in Chinahttps://www.reuters.com/article/us-china-health-who-idUSKBN1ZM1G9First Case of Coronavirus Confirmed in Spainhttps://edition.cnn.com/asia/live-news/coronavirus-outbreak-02-01-20-intl-hnk/h_afcf3a4665521aab11c721c8cc80dd03Coronavirus Confirmed as Pandemic by World Health Organizationhttps://www.bbc.com/news/world-51839944MWC 2020: Smartphone Showcase Cancelled over Coronavirus Fearshttps://www.bbc.com/news/technology-51474116Capacity of the First League Stadiums in Spainhttps://www.enterat.com/actualidad/estadios-futbol-espana.phpMore than 550,000 People Demonstrating for Women Rights in Madrid and Barcelonahttps://www.elmundo.es/espana/2019/03/08/5c82a5da21efa09e348b469c.htmlMadrid Locksdown the Education System and Recommends Teleworkinghttps://www.lavanguardia.com/local/madrid/20200309/474061897680/madrid-ordena-cierre-colegios-coronavirus.htmlAll of Italy Placed under Coronavirus Lockdownhttps://www.bbc.com/news/world-europe-51810673State of Alarm Conditionshttps://www.boe.es/eli/es/rd/2020/03/14/463/conMerkel Says ‘Let’s Get through This’ as Shops, Bars and Churches Shuthttps://www.reuters.com/article/us-health-coronavirus-germany-economy/merkel-says-lets-get-through-this-as-shops-bars-and-churches-shut-idUSKBN213178Coronavirus: Europe Plans Full Border Closure in Virus Battlehttps://www.bbc.com/news/world-europe-51918596Italy Tightens Virus Lockdown after Worst Daily Death Tollhttps://www.bloomberg.com/news/articles/2020-03-19/italy-is-now-world-s-deadliest-hotspot-in-the-virus-pandemicChina to Lift Lockdown on Wuhan, Ground Zero of Coronavirus Pandemichttps://edition.cnn.com/2020/03/24/asia/coronavirus-wuhan-lockdown-lifted-intl-hnk/index.htmlCoronavirus: Strict New Curbs on Life in UK Announced by PMhttps://www.bbc.com/news/uk-52012432State of Alarm Thighteninghttps://www.boe.es/buscar/doc.php?id=BOE-A-2020-4166Coronavirus: Sharp increase in Deaths and Cases in Hubeihttps://www.bbc.com/news/world-asia-china-51482994Kampf, G., Todt, D., Pfaender, S., & Steinmann, E. (2020). Persistence of coronaviruses on inanimate surfaces and their inactivation with biocidal agents. Journal of Hospital Infection, 104(3), 246-251. doi:10.1016/j.jhin.2020.01.022Coronavirus Disease (COVID-2019) Situation Reportshttps://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports

Use of a Novel Polymer-Coated Steel as an Alternative to Traditional Can Manufacturing in the Food Industry

[EN] Metal containers (both food and beverage cans) are made from huge steel or aluminum coils that are transformed into two- or three-piece products. During the manufacturing process, the metal is sprayed on both sides and the aerosol acts as insulation, but unfortunately produces volatile organic compounds (VOCs). The present work presents a different way to manufacture these containers using a novel prelaminated two-layer polymer steel. It was experimentally possible to verify that the material survives all the involved manufacturing processes. Thus tests were carried out in an ironing simulator to measure roughness, friction coefficient and surface quality. In addition, two theoretical ironing models were developed: upper bound model and artificial neural network. These models are useful for packaging designers and manufacturers.Sellés, M.; Schmid, SR.; Sanchez-Caballero, S.; Ramezani, M.; Pérez Bernabeu, E. (2021). Use of a Novel Polymer-Coated Steel as an Alternative to Traditional Can Manufacturing in the Food Industry. Polymers. 13(2):1-15. https://doi.org/10.3390/polym13020222S11513