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Search Results: 1 - 10 of 4144 matches for " Albert Corominas "
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LETRIS: Staffing service systems by means of simulation
Albert Corominas,Amaia Lusa
Journal of Industrial Engineering and Management , 2012, DOI: 10.3926/jiem.219
Abstract: Purpose: This paper introduces a procedure for solving the staffing problem in a service system (i.e., determining the number of servers for each staffing period). Design/methodology: The proposed algorithm combines the use of queueing theory to find an initial solution with the use of simulation to adjust the number of servers to meet previously specified target non-delay probabilities. The basic idea of the simulation phase of the procedure is to successively fix the number of servers from the first staffing period to the last, without backtracking. Findings: Under the assumptions that the number of servers is not upper-bounded and there are no abandonments and, therefore, no retrials, the procedure converges in a finite number of iterations, regardless of the distributions of arrivals and services, and requires a reasonable amount of computing time. Originality / value: The new procedure proposed in this paper is a systematic, robust way to find a good solution to a relevant problem in the field of service management and it is very easy to implement using no more than commonly accessible tools.
Optimal manufacturing and remanufacturing capacities of systems with reverse logistics and deterministic uniform demand
Ernest Benedito,Albert Corominas
Journal of Industrial Engineering and Management , 2010, DOI: 10.3926/jiem..v3n1.p33-53
Abstract: Using reverse logistics in production systems can help to reduce costs. However, it can also mean introducing a source of uncertainty in the system behavior. In this study we present a method for calculating the optimal manufacturing and remanufacturing capacities of a system with reverse logistics and steady demand taking into account the random behavior of the quantity, quality and timing of units that are collected thru the reverse logistics system. The collected units are remanufactured or disposed of. We also provide an example to illustrate the method.
Assessing the impact on optimal production capacities in a closed-loop logistics system of the assumption that returns are stochastically independent of sales
Ernest Benedito,Albert Corominas
Journal of Industrial Engineering and Management , 2011, DOI: 10.3926/jiem..v4n3.p504-522
Abstract: Purpose: This paper is concerned with a reverse logistic system where returns are stochastically dependents on sales. The aim of the paper is to assess the influence on optimal production capacities when is assumed that returns are stochastically independent of sales. Design/methodology/approach: This paper presents a model of the system. An approximated model where is assumed that returns are stochastically independent of sales, is formulated to obtain the optimal capacities. The optimal costs of the original and the approximated models are compared in order to assess the influence of the assumption made on returns. Findings: The assumption that returns are stochastically independent of sales is significant in few cases. Research limitations/implications: The impact of the assumption on returns is assessed indirectly, by comparing the optimal costs of both models: the original and approximated. Practical implications: The problem of calculating the optimal capacities in the original model is hard to solve, however in the approximated model the problem is tractable. When the impact of the assumption that returns are stochastically independent of sales is not significant, the approximated model can be used to calculate the optimal capacities of the original model. Originality/value: Prior to this paper, few papers have addressed with the problem of calculating the optimal capacities of reverse logistics systems. The models found in these papers assumed that returns are stochastically independent of sales.
Optimal priority ordering in PHP production of multiple part-types in a failure-prone machine
Ana Sánchez,Albert Corominas,Rafael Pastor
Journal of Industrial Engineering and Management , 2009, DOI: 10.3926/jiem..v2n3.p418-436
Abstract: This note deals with the problem of minimising the expected sum of quadratic holding and shortage inventory costs when a single, failure-prone machine produces multiple part-types. Shu and Perkins (2001) introduce the problem and, by restricting the set of control policies to the class of prioritised hedging point (PHP) policies, establish simple, analytical expressions for the optimal hedging points provided that the priority ordering of the part-types is given. However, the determination of an optimal priority ordering is left by the authors as an open question. This leaves an embedded sequencing problem which we focus on in this note. We define a lower bound for the problem, introduce a test bed for future developments, and propose three dynamic programming approaches (with or without the lower bound) for determining the optimal priority orderings for the instances of the test bed. This is an initial step in a research project aimed at solving the optimal priority ordering problem, which will allow evaluating the performance of future heuristic and metaheuristic procedures.
Production, staff, working time and financial planning Planificación agregada de la producción, la plantilla, el tiempo de trabajo y la tesorería
Orlando Boiteux,Albert Corominas,Amaia Lusa,Carme Martinez
Intangible Capital , 2009, DOI: 10.3926/ic.118
Abstract: Aggregate planning can be a tool for coordinating the tactical decisions belonging to some functional areas of a company. This potential has been limited due to methodological and technical reasons, but nowadays it is possible to solve very sophisticated models integrating, with a high level of detail, a great number of decisions of several functional areas and that permit to include new management schemes. In this paper, a production, staff, working time and cash management model is introduced. Potencialmente la planificación agregada es un instrumento de coordinación de las decisiones tácticas en las diversas áreas funcionales de la empresa. Este potencial se ha visto limitado por razones técnicas y metodológicas, pero actualmente es posible resolver modelos muy complejos que integran, con mayor detalle, un mayor número de decisiones de varias áreas funcionales y que permiten incorporar nuevas modalidades de gestión. Se introduce un modelo de planificación de la producción, la plantilla, el tiempo de trabajo y la tesorería.
ISOS: A job evaluation system to implement comparable worth
Albert Corominas,Anna Maria Coves,Amaia Lusa,Carme Martinez
Intangible Capital , 2008,
Abstract: A fair pay structure is an essential element of the personnel policy of a firm. If the pay structure is perceived as arbitrary by the members of the staff, it becomes a cause of disturbance of the labor relations. Particularly, a pay structure is unfair if it discriminates against women. Job evaluation is a traditional tool used by companies to assist in the process of determining pay structures that can be also useful to detect and combat wage discrimination, since allow determining whether two jobs are of comparable worth or not. Although there are many kinds of systems, authors agree when defining point factor methods as the most appropriate and fair job evaluation systems. However, even being well defined from a technical point of view, most existing systems give discriminatory results regarding to gender. ISOS, a new job evaluation system which is described in this paper, has been designed, with the aim to define a neutral system with regard to gender, based on present jobs characteristics, existing job evaluation systems and job description questionnaires, international experts’ knowledge and a wide body of literature on gender discrimination and its relation with job evaluation. Using ISOS can contribute to detect, combat and eliminate part of the existing wage discrimination in general and, in particular, against women. ISOS includes all aspects of the work so no characteristics are omitted. The system can be applied in any company and to evaluate any job, and offers flexibility to be adapted to the specific characteristics of an organization. ISOS can also be used to detect and combat wage discrimination. Furthermore, characteristics of present jobs, such as cross-training or flexible working time, are also included so the system can be considered innovative in a very traditional field of industrial engineering.
Proceso de Bolonia (IV): currículo o plan de estudios Bolognia Process (IV): curriculum or syllabus
Joan Prat-Corominas,Albert Oriol-Bosch
Educación Médica , 2011,
Abstract:
Exposición a riesgos psicosociales entre la población asalariada en Espa?a (2004-05): valores de referencia de las 21 dimensiones del cuestionario COPSOQ ISTAS21
Moncada Lluís,Salvador; Llorens Serrano,Clara; Font Corominas,Ariadna; Galtés Camps,Ariadna; Navarro Giné,Albert;
Revista Espa?ola de Salud Pública , 2008, DOI: 10.1590/S1135-57272008000600007
Abstract: background. reference values of all the 21 psychosocial scales or dimensions (73 items) of the psychosocial risk assessment questionnaire copsoq istas21 are computed from a representative sample of the wage earning population in spain. methods. representative sample of the spanish wage-earning population, n=7,612. the sampling was multi-stage by conglomerates. the information was obtained by the administration of a standardized questionnaire in the household during 2004-2005. all 21 scales were standardized and three punctuation levels were established and labelled as "more favourable to health (or green)", "intermediate (or yellow)" and "more unfavourable to health (or red)" according two criteria: 1) to obtain groups that follow a tertiles theoretical distribution and 2) to get the "red" and "green" groups as equilibrated as possible. results. response rate was 60. predictability dimension showed the wider difference between "green" and "red" proportions (7.14). role clarity concentred the 35.06 % of population between 100 and 93.75 points, and sense of community the 29.6% between 100 and 91.67. double presence and hiding emotions grouped the 34.02% and the 27.74% % of population between 0 and 12.5 points, respectively. conclusions. 2005 upgraded representative reference values of the 21 copsoq istas21? psychosocial dimensions for the wage earning population in spain are available, necessary premise to diagnose risk situations and prioritize the needed preventive actions at company level.
PATATAS Y HUEVOS OSMóTICOS
Josep Corominas
Revista Eureka sobre Ense?anza y Divulgación de las Ciencias , 2010,
Abstract: Para ilustrar el fenómeno de la ósmosis se presentan dos experiencias sencillas que pueden realizarse con materiales cotidianos (patatas, huevos, agua, sal, vinagre...), tanto a nivel cualitativo como cuantitativo.
Chemical party: spirits that are not so, drinks for no drinking and something to eat
Corominas, Josep
Revista Eureka sobre Ense?anza y Divulgación de las Ciencias , 2011,
Abstract: Se describen cuatro experimentos de reacciones químicas y propiedades de las soluciones presentados en forma lúdica, con la finalidad primero de atraer la atención para inmediatamente después provocar la reflexión acerca del fenómeno observado.
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