A Practical Example for Model-Driven Web Requirements

The number of approaches for Web environments has grown very fast in the last years: HDM, OOHDM, and WSDM were among the first, and now a large number can be found in the literature. With the definition of MDA (Model- Driven Architecture) and the acceptance of MDE (Model-Driven Engineering) techniques in this environment, some groups are working in the use of metamodels and transformations to make their approaches more powerful. UWE (UMLBased Web Engineering) or OOWS (Object-Oriented Web Solutions) are only some examples. However, there are few real experiences with Web Engineering in the enterprise environment, and very few real applications of metamodels and MDE techniques. In this chapter the practical experience of a Web Engineering approach, NDT, in a big project developed in Andalusia is presented. Besides, it shows the usability of metamodels in real environments

A Practical Environment to Apply Model-Driven Web Engineering

The application of a model-driven paradigm in the development of Web Systems has yielded very good research results. Several research groups are defining metamodels, transformations, and tools which offer a suitable environment, known as model-driven Web engineering (MDWE). However, there are very few practical experiences in real Web system developments using real development teams. This chapter presents a practical environment of MDWE based on the use of NDT (navigational development techniques) and Java Web systems, and it provides a practical evaluation of its application within a real project: specialized Diraya.Ministerio de Educación y Ciencia TIN2007-67843-C06-03Ministerio de Educación y Ciencia TIN2007-30391-

Multibody simulation of railway vehicles with contact lookup tables

The use of contact lookup tables is widely used in multibody railway simulations to increase the computational efficiency. However, due to simplifying assumptions the use of contact lookup tables decreases the accuracy of the simulation results. This paper analyses the increase of computational efficiency and loss of accuracy for a particular multibody simulation. To this end the results based on contact lookup tables are compared with the results of the online solution of the wheel-rail contact constraints. The formulation used to compute the equations of motion of railway vehicles has the following features: (1) the equations of motion are obtained using a systematic procedure based on multibody dynamics, (2) generalized forces included in the equations of motion are obtained using symbolic computations when possible, (3) generalized coordinates are referred to a non-inertial track frame, (4) the equations of motion are obtained using a velocity transformation of the Newton–Euler equations of the vehicle bodies, which are assumed to be rigid and (5) wheel-rail tread contact and flange contact are treated with pre-calculated lookup tables which can take into account the track irregularities. The comparative study presented in this paper shows that this formulation can be used to simulate the dynamics of a railway vehicle in real-time.Spanish Ministry of Economy, Industry and Competitiveness (MINECO) under the project TRA2017- 86355-C2-1-

Creación de un modelo matemático para estimación de precio a partir de regresión múltiple, con aplicación en software, para servicio de control centralizado

164 p.La optimización en las empresas es un paso muy necesario, gracias a esto se producen importantes mejoras ya sea a nivel de procesos, tiempo o calidad. En esta memoria se pretende realizar optimización a un proceso que en la actualidad no está permitiendo abarcar el mercado objetivo, lo cual no permite alcanzar el crecimiento esperado. La consecuencia de ello es baja adjudicación de proyectos, lo cual ha llevado a los encargados a buscar novedosos sistemas de optimización donde es primordial que involucre bajos costos. La empresa en cuestión es Cam Chile S.A y el área en la cual se necesita la optimización es el servicio de control centralizado, el cual consta de realizar automatización de los sistemas de un edificio y gestión de la energía. El problema de esta empresa en específico es la gran demora en la entrega de la cotización inicial, que la ha llevado a no ser considerada en las negociaciones posteriores, de esta forma optimizar el tiempo en la entrega de una cotización representa una importante ventaja competitiva, es por esto, que la empresa ha solicitado la creación de un modelo capaz de predecir aproximadamente el precio de futuros proyectos a partir de datos históricos de proyectos ya ejecutados. La elección de realizar un modelo radica en dos criterios, los bajos costos que implica y que no es necesario que el valor sea exacto. En cuanto al desarrollo se pretenderá encontrar el mejor modelo para los datos basándose en la teoría de la estadística, para que una vez que se obtenga el modelo sea implementado en alguna aplicación para computador y así utilizarlo de forma rápida y fácil

Analysis of the two-point wheel-rail contact scenario using the knife-edge-equivalent contact constraint method

This paper presents a rigid contact approach to analyse the two-point wheel-rail contact scenario using the simplified constraint-based contact method called Knife-edge Equivalent Contact method (KEC-method). The proposed approach makes use of the computationally efficient online solution of the KEC constraints, where a single-point rail is in contact with an equivalent wheel profile, and provides an exact relation between the location of the contact points in the equivalent and real profiles. In this context, the two-point contact scenario can be easily dealt by linearly softening the KEC-constraints in the vicinity of the two-point contact, that gives a continuous and unique contact point solution between each wheel-rail pair and avoids finite contact point jumps between tread and flange. This allows an efficient kinematic solution of the two-point contact scenario. However, to properly ac- count for a dynamic equivalence of the two-point contact scenario in the computation of the tangential contact forces, the reaction force acting on the wheel when the contact point lies on the tread-flange transition, is transformed into two contact forces acting on the tread and flange respectively maintaining the resultant equilibrium of forces at the wheel.Spanish Ministry of Science, Innovation and Universities under Project Reference TRA2017- 86355-C2-1-R

An alternative procedure to measure railroad track irregularities. Application to a scaled track

In this paper an alternative procedure to accurately measure static railroad track irregularities is proposed and applied to a scaled railroad track. The purpose of this work is the determination of highlyprecise measured data in short track segments that needs to be used as input in the validation of railroad computational models that are used for on-board railroad track measurement systems. The procedure consists of the use of a topographic total station combined with a postprocessing of the measured data that reduces misalignment errors and provide the analytical ideal geometry of the track together with its irregular geometry characterized in terms of the magnitudes of track gauge, vertical profile, alignment and cross level. Experimental results are compared to standard magnitudes of full scale tracks showing that real track geometry can differ from PSD-based predicted one. This supports the application of the proposed procedure for an accurate geometric determination of short track segments.Spanish Ministry of Science, Innovation and Universities under the project reference TRA2017-86355-C2-1-

Railway multibody simulation with the knife-edge-equivalent wheel–rail constraint equations

This paper describes a new numerical procedure for the modelling and simulation of the wheel–rail contact in railway dynamic simulations. The method is called knifeedge- equivalent contact constraint method, or simply KEC-method. Using this method, the wheel–rail contact is modelled as rigid or constraint-based using a set of kinematic constraints that eliminates one-degree of freedom of relative wheel–rail motion. The KECmethod uses a transformed but equivalent wheel profile in contact with a single-point rail. This equivalent profile has the property of producing the same wheelset-rail relative kinematics as the real wheel–rail profiles. The method can be used efficiently online while achieving better computational times than using contact lookup tables. Compared with existing constraint methods, the KEC-method has the following advantages: (1) simplification of the wheel–rail contact constraints, (2) simplified wheel–rail profiles, (3) online solution of the contact constraints, (4) reduction of the number of surface parameters, and (5) increased computational efficiency. A comparative study with respect to the use of efficient contact lookup tables in the simulation of Metro de Sevilla (metropolitan train in the city of Sevilla) shows that this contact method is appropriate to simulate the dynamics of a railway vehicle efficiently.Spanish Ministry of Science, Innovation and Universities under project reference TRA2017-86355-C2-1-R and the Spanish Ministry of Science, Innovation and Universities under the Mobility Program ‘José Castillejo’ with reference CAS18/00072

IoMT-Driven eHealth: A Technological Innovation Proposal Based on Smart Speakers

Internet of Medical Things (IoMT) is a technological concept applied in healthcare contexts to achieve the digital interconnection of everyday objects with the Internet in order to make life easier for people. IoMT can help monitor, inform and notify not only caregivers, but provide healthcare providers with actual data to identify issues before they become critical or to allow for earlier invention. In this sense, this paper is contextualized in Assisted Repro duction Treatment (ART) processes to reduce the number of hospital visits, reduce healthcare costs and improve patientcare, as well as the productivity of the healthcare professional. So, we present an IoMT-based technological pro posal to manage and control the prescription of pharmacological treatments to patients who are carried out ART processes. In this context, we propose the integration of iMEDEA (modular system specialized in the management of electronic clinical records for ART unit) and smart speaker devices (specifically, Amazon’s Alexa), as well as the validation of our proposal in the real envi ronment offered by Inebir clinicMinisterio de Economía y Competitividad TIN2016-76956-C3-2-R (POLOLAS)Junta de Andalucía AT17-5904-US

Design and manufacture of a scaled railway track with mechanically variable geometry

The objective of this article is to present the design and manufacture of a scaled railroad track to be used as a laboratory track for the study of different railway applications. It could be a guideline for future laboratory railroad tracks. The ideal concept was based on possible future studies and, according to them, design requirements have been specified. The main characteristic of the track is that its geometry can be mechanically modified and irregularities can be introduced under controlled conditions in any kind of track sections: straight, curved and transition ones. Finally, the current installed track is shown and the performed quality controls are described.Junta de Andalucia through the European Regional Development Fund under project reference P18-RT-1772. Spanish Ministry of Economy, Industry and Competitiveness (MINECO) and the European Union through FEDER funds for the funding through the project UNSE15-CE-2863, and the project TRA2017-86355-C2-1-R (MINECO/AEI/FEDER, UE)

Chaos in Small-World Networks

A nonlinear small-world network model has been presented to investigate the effect of nonlinear interaction and time delay on the dynamic properties of small-world networks. Both numerical simulations and analytical analysis for networks with time delay and nonlinear interaction show chaotic features in the system response when nonlinear interaction is strong enough or the length scale is large enough. In addition, the small-world system may behave very differently on different scales. Time-delay parameter also has a very strong effect on properties such as the critical length and response time of small-world networks