La falta de homogeneidad del producto (FHP) en las empresas cerámicas y su impacto en la reasignación del inventario

La asignación del producto disponible a prometer (ATP) a pedidos en contextos de fabricación contra almacén (MTS) es de la máxima importancia ya que puede influir en la satisfacción del cliente y en los beneficios de la empresa. Sin embargo, una asignación inicial adecuada, puede pasar a ser inadecuada por diversas razones. En estos casos, es necesaria la reasignación del inventario, la cual será más compleja cuanto más ambiciosos sean los objetivos a alcanzar con ella y mayor el volumen de información a utilizar. En este sentido, cabe destacar que la falta de homogeneidad en el producto (FHP), presente en distintos sectores industriales, provoca la atomización del inventario y aumenta la complejidad de la reasignación, dificultando la obtención de soluciones óptimas. En el presente trabajo se describe la problemática de la FHP, primero de manera genérica, y luego, particularizada a empresas cerámicas MTS. Posteriormente, se identifican las situaciones en las que una determinada asignación de ATP puede dejar de ser adecuada en dicho contexto y se propone la reasignación como una forma de búsqueda de nuevas asignaciones válidas. Finalmente, mediante un caso de estudio de una empresa cerámica, se analiza el impacto de la FHP en cada una de las situaciones identificadas, observando que la FHP provoca alguna de éstas situaciones y complica, en todas ellas, la reasignación del inventario a pedidos.Peer reviewe

Kinetic Regimes and Cross-Over Times in Many-Particle Reacting Systems

We study kinetics of single species reactions ("A+A -> 0") for general local reactivity Q and dynamical exponent z (rms displacement x_t ~ t^{1/z}.) For small molecules z=2, whilst z=4,8 for certain polymer systems. For dimensions d above the critical value d_c=z, kinetics are always mean field (MF). Below d_c, the density n_t initially follows MF decay, n_0 - n_t ~ n_0^2 Q t. A 2-body diffusion-controlled regime follows for strongly reactive systems (Q>Qstar ~ n_0^{(z-d)/d}) with n_0 - n_t ~ n_0^2 x_t^d. For Q<Qstar, MF kinetics persist, with n_t ~ 1/Qt. In all cases n_t ~ 1/x_t^d at the longest times. Our analysis avoids decoupling approximations by instead postulating weak physically motivated bounds on correlation functions.Comment: 10 pages, 1 figure, uses bulk2.sty, minor changes, submitted to Europhysics Letter

Isospin Breaking in the Relation Between the tau-->nu_tau pi pi and e^+e^- -->pi^+ pi^- Versions of |F_\pi (s)|^2$ and Implications for (g-2)_mu

We investigate two points related to existing treatments of isospin-breaking corrections to the CVC relation between the e^+e^- --> pi^+ pi^- cross-section and dGamma[tau^- --> nu_tau pi^- pi^0]/ds. Implications for the value of the hadronic contribution to a_mu =(g-2)_mu /2 based on those analyses incorporating hadronic tau decay data are also considered. We conclude that the uncertainty on the isospin-breaking correction which must be applied to the tau decay data should be significantly increased, and that the central value of the rho-omega ``mixing'' contribution to this correction may be significantly smaller than indicated by the present standard determination. Such a shift would contribute to reducing the discrepancy between the tau- and electroproduction-based determinations of the leading order hadronic contribution to a_mu.Comment: 15 pages, 1 figur

Hadron Production via e+e- Collisions with Initial State Radiation

A novel method of studying e+e- annihilation into hadrons using initial state radiation at e+e- colliders is described. After brief history of the method, its theoretical foundations are considered. Numerous experiments in which exclusive cross sections of e+e- annihilation into hadrons below the center-of-mass energy of 5 GeV have been measured are presented. Some applications of the results obtained to fundamental tests of the Standard Model are listed.Comment: 50 pages, 88 figures, accepted for publication in Rev. Mod. Phy

Models of Isospin Breaking in the Pion Form Factor: Consequences for the Determination of Pi_{\rho\omega}(m_rho^2) and (g-2)_mu/2

We study the implications of several recent high-precision measurements of the pion form factor in the region of the rho-omega interference "shoulder" for (i) the extraction of the rho-omega mixing matrix element, Pi_{\rho\omega}(m_rho^2), and (ii) the evaluation of the isospin-breaking (IB) correction needed to incorporate hadronic tau decay data into the determination of the Standard Model expectation for the leading order hadronic contribution, [a_mu]_{had}^{LO}, to the anomalous magnetic moment of the muon, focussing, in the latter case, on the model-dependence of the rho-omega mixing component of the IB correction. We consider a range of different models for the broad rho contribution to the e^+e^- --> \pi\pi amplitude, applying these models to each experimental data set, and find that the model dependence of the rho-omega mixing correction is significantly larger than the uncertainty induced by experimental errors for any individual model. We also find that, for each such model, the recent data allows one to separate rho-omega mixing and direct omega --> \pi\pi coupling contributions to the amplitude, and hence to obtain a reasonably precise extraction of Pi_{\rho\omega}(m_rho^2), uncontaminated by direct omega --> \pi\pi coupling effects, for use in meson exchange model calculations of charge symmetry breaking in NN scattering.Comment: 25 pages, 4 figures. Final published version. Main change is inclusion of a detailed discussion of the source of differences between the present work and M. Davier et al. (arXiv:0906.5443v3

Rates of convergence of nonextensive statistical distributions to Levy distributions in full and half spaces

The Levy-type distributions are derived using the principle of maximum Tsallis nonextensive entropy both in the full and half spaces. The rates of convergence to the exact Levy stable distributions are determined by taking the N-fold convolutions of these distributions. The marked difference between the problems in the full and half spaces is elucidated analytically. It is found that the rates of convergence depend on the ranges of the Levy indices. An important result emerging from the present analysis is deduced if interpreted in terms of random walks, implying the dependence of the asymptotic long-time behaviors of the walks on the ranges of the Levy indices if N is identified with the total time of the walks.Comment: 20 page

Review of mathematical models for production planning under uncertainty due to lack of homogeneity: proposal of a conceptual model

[EN] Lack of homogeneity in the product (LHP) appears in some production processes that confer heterogeneity in the characteristics of the products obtained. Supply chains with this issue have to classify the product in different homogeneous subsets, whose quantity is uncertain during the production planning process. This paper proposes a generic framework for reviewing in a unified way the literature about production planning models dealing with LHP uncertainty. This analysis allows the identification of similarities among sectors to transfer solutions between them and gaps existing in the literature for further research. The results of the review show: (1) sectors affected by LHP inherent uncertainty, (2) the inherent LHP uncertainty types modelled, and (3) the approaches for modelling LHP uncertainty most widely employed. Finally, we suggest a conceptual model reflecting the aspects to be considered when modelling the production planning in sectors with LHP in an uncertain environment.This research was initiated within the framework of the project funded by the Ministerio de Economía y Competitividad [Ref. DPI2011-23597] entitled ‘Methods and models for operations planning and order management in supply chains characterised by uncertainty in production due to the lack of product uniformity’ (PLANGES-FHP) already finished. After, the project leading to this application has received funding from the European Union’s research and innovation programme under the H2020 Marie Skłodowska-Curie Actions with the grant agreement No 691249, Project entitled ’Enhancing and implementing Knowledge based ICT solutions within high Riskand Uncertain Conditions for Agriculture Production Systems’ (RUC-APS).Mundi, I.; Alemany Díaz, MDM.; Poler, R.; Fuertes-Miquel, VS. (2019). 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E-learning in “innovation, creativity and entrepreneurship”: Exploring the new opportunities and challenges of technologies

Companies and society demand professionals be able to provide creative solutions with added value as well as to implement them in order to face the arising challenges in the increasingly dynamic environment. Although the transversal competence “Innovation, Creativity and Entrepreneurship” is essential for engineers that should find innovative solutions to problems, teachers find many difficulties when training and evaluating their students in the scope of the regular courses: large groups, very adjusted time to technical contents. In this context, the School of Industrial Engineering (ETSII) at Polytechnic University of Valencia (UPV) is aware of the opportunities offered by new information and communication technologies to support teachers in this task while enhancing students’ generic outcomes. For this reason, an e-learning platform has been created on this competence, that offers valuable resources to students to implement this competence throughout the assigned course tasks, and supports teachers prompted to train and evaluate this transversal competence. With this platform, the authors aim to contribute to the still neglected educational aspect of entrepreneurship and address for the first time in an e-learning system its relationship with innovation and creativity

R-values in Low Energy e^+e^- Annihilation

This presentation briefly summarizes the recent measurements of R-values in low energy e^+e^- annihilation. The new experiments aimed at reducing the uncertainties in R-values and performed with the upgraded Beijing Spectrometer (BESII) at Beijing Electron Positron Collider (BEPC) in Beijing and with CMD-2 and SND at VEEP-2M in Novosibirsk are reviewed and discussed.Comment: 17 pages, 10 figures, invited presentation at the XIX International Symposium on Lepton and Photon Interactions at High Energy, Stanford University, August 199

Analysis of OM-Based Literature Reviews on Facility Layout Planning

This work consists of a systematized review of the state of the art of reviews for the problem of Facility Layout Planning (FLP) within the Operations Management (OM) field to support the decisions taken for the improvement of the manufacturing and logistics in a factory environment. The first phase begins by defining the search strategies for obtaining the scientific literature, for which we used ten databases. With these, a base of 112 articles was obtained, but after the systematized process was reduced to 32 directly related articles. In the second phase, we executed a Dimensional analysis of these literature review articles employing a quantitative analysis of the sections and subsections of the selected articles. The third phase comprises the identification of gaps and future research lines. Finally, the conclusions obtained from the systematized review process are presented