• A discrete-time queueing system with feedback and optional service 

      Atencia-McKillop, Ivan; Merino-Cordoba, Salvador; Guzman-Navarro, Francisco; Fortes, Inmaculada; Sánchez, Sixto (2016-07-29)
      Queueing systems constitute a central tool in modeling and performance analysis. These types of systems are in our everyday life activities, and the theory of queueing systems was developed to provide models for forecasting ...
    • A discrete-time queueing system with three different strategies 

      Atencia-McKillop, Ivan; Padilla-Domínguez, Yolanda; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; [et al.] (Elsevier, 2021-09)
      We consider a discrete-time Geo/G/1/inf system in which a customer that finishes its first essential service may opt to abandon the system, to receive a second optional service or to go at the head of the queue in order ...
    • A Discrete-Time retrial queueing system with service upgrade 

      Fortes, Inmaculada; Sánchez, Sixto; Atencia-McKillop, Ivan (2015-06-10)
      We study the Markov chain underlying the considered queueing system obtaining the gen- erating function of the number of customers in the orbit and in the system as well as the stationary distribution of the time that a ...
    • A discrete-time system with uncertainty information 

      Atencia-McKillop, Ivan; Fortes, Inmaculada; Sánchez, Sixto (2017-02-14)
      This paper considers a discrete-time queueing system with uncertainty information, that is, an arriving customer may opt, with a certain probability, to be served under a Last Come First Served (LCFS) discipline or, with ...
    • A Non Markovian Retrial Queueing System 

      Atencia-McKillop, Ivan; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; [et al.] (2022-06-13)
      Researches on retrial queues with non-geometrical retrial times is motivated by real computers and telecommunication networks, where retrial times can hardly be geometrical distributed. The inherent difficulty with ...
    • A Discrete-time Queueing System With Imperfect Information for the Server 

      Atencia-McKillop, Ivan; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Padilla-Domínguez, Yolanda; [et al.] (2020-07-24)
      We consider a discrete-time Geo=G=1=1 system in which a customer that finishes its fi rst essential service may opt to abandon the system, to receive a second optional service or to place at the head of the queue in order ...
    • Improving CAS Capabilities: New Rules for Computing Improper Integrals 

      Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; Padilla-Domínguez, Yolanda; [et al.] (2016-07-14)
      There are diferent applications in Engineering that require to compute improper integrals of the first kind (integrals defined on an unbounded domain) such as: the work required to move an object from the surface of the ...
    • A New Web-stepwise Solver for Ordinary Differential Equations 

      Galán-García, José Luis; Aguilera-Venegas, Gabriel; Le Goff, Morgan; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; [et al.] (2020-07-24)
      In this paper we introduce SODES (Step-wise Ordinary Differential Equations Solver) which is a new solver for Ordinary Dfferential Equations (ODE). SODES can be used not only as a solver but also as a tutorial for the ...
    • Queueuing system with failures and priorities 

      Atencia-McKillop, Ivan; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodríguez, Pedro; Galán-García, María Ángeles (2016-07-07)
      Queueing theory provides models, structural insights, problem solutions and algorithms to many application areas. Due to its practical applicability to production, manufacturing, home automation, communications ...
    • A retrial discrete-time queueing system with actions in the server 

      Atencia-McKillop, Ivan (2019-10-31)
      This paper considers a discrete-time retrial queueing system with movements. The arriving customers can opt to go directly to the server obtaining immediately their service or to join the orbit. In the first case, if the ...
    • Server information mechanism in a discrete-time queueing system 

      Atencia-McKillop, Ivan; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles (2018-06-14)
      This paper discusses a discrete-time queueing system in which an arriving customer may adopt four di erent strategies depending on the income information, two of them correspond to a LCFS discipline where displacements ...
    • Sojourn Times and Steady-state Probabilities in a Retrial Queueing System 

      Atencia-McKillop, Ivan (2020-07-24)
      This paper analyses a discrete-time Geo/G/1 retrial queue with general retrial times in which the arriving customers may opt to follow a LCFS-PR discipline or to join the orbit where it is contemplated the movement of ...
    • SPDES: A Stepwise Solver for Teaching Partial Differential Equations 

      Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; Padilla-Domínguez, Yolanda; [et al.] (2020-07-24)
      Partial Differential Equations (PDE) are an important topic within the Engineering Degrees syllabus. In addition, many students find some dificulties in the learning process of this topic. Therefore, the use of didactical ...
    • Teaching Partial Differential Equations With a CAS 

      Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; Padilla-Domínguez, Yolanda; [et al.] (2022-06-13)
      It is very common that Engineering students nd difficulties when studying advanced Mathematics subjects. To help in the teaching and learning process of such subjects, the teacher can use an adequate mathematical software. ...
    • Using extensions of the residue theorem for improper integrals computations with CAS 

      Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; Galán-García, María Ángeles; Padilla-Domínguez, Yolanda; [et al.] (2018-06-14)
      The computation of improper integrals of the rst kind (integrals on unbounded domain) are used in di erent applications in Engineering (for example in Kynetic Energy, electric potential, probability density functions, ...