Manuel Cardós

Manuel Cardós
Universitat Politècnica de València | UPV · Department of Business Organisation

About

64
Publications
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705
Citations
Citations since 2016
16 Research Items
379 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (64)
Article
Full-text available
In the continuous review reorder point, base-stock ( s , S ) policy, the replenishment order is launched when the inventory position reaches the reorder point, s . It is commonly assumed that the inventory position is exactly equal to the reorder point at the moment the order is launched, when actually it could be lower at that moment. This implies...
Article
Full-text available
Los gestores de inventario tienen que asignar una política de inventario a cada artículo con el fin de satisfacer un nivel de servicio global requerido con el menor coste de inventario. En el presente documento se examina la bibliografía existente y, sobre la base de las investigaciones actuales, se proponen las opciones más apropiadas para su util...
Chapter
This paper proposes a novel, exact procedure for the joint determination of the reorder point and the price, given that demand is a power function of price and the objective is profit maximization. Some examples illustrate the effect of elasticity on the existence of a profit optimum; in fact just elastic demand items present such optima. The proce...
Chapter
Clean air is a basic requirement of human health and well-being. However, in 2014, 92% of the population lived in places where the World Health Organization Guidelines on air quality were not respected. Different projects and studies at European, national and local levels raise strategies to fight against atmospheric pollution through the control a...
Article
Full-text available
p>The European Union, its member states and local authorities have been working for long time on the design of solutions for future sustainable mobility. The promotion of a sustainable and affordable urban transport contemplates the bicycle as a mean of transport. The reasons for analysing the cycling mobility in urban areas, has its origin in the...
Article
Full-text available
The safety stock calculation requires a measure of the forecast error uncertainty. Such errors are usually assumed Gaussian iid (independent, identically distributed). However, deviations from iid deteriorate the supply chain performance. Recent research has shown that, alternatively to theoretical approaches, empirical techniques that do not rely...
Article
Full-text available
Supply chain risk management has drawn the attention of practitioners and academics alike. One source of risk is demand uncertainty. Demand forecasting and safety stock levels are employed to address this risk. Most previous work has focused on point demand forecasting, given that the forecast errors satisfy the typical normal i.i.d. assumption. Ho...
Article
Cities are a huge growing market for distribution companies (logistics), whose object is to cover goods/products supply requirements, deliver parcels and replenish stocks. Supplying the companies and businesses located in cities is a daily challenge for any logistics company. Among various existing city models, the so-called compact cities presentl...
Article
Full-text available
p>European cities are facing enormous challenges in accessibility and livability terms due to several European directives, which are compulsory in the mid/long term, traffic congestion levels are still increasing, and air pollution and noise disturbs citizens’ lives. This work presents the study carried out in a Mediterranean city to define an Envi...
Chapter
The fill rate is usually computed by using the traditional approach, which calculates it as the complement of the quotient between the expected unfulfilled demand and the expected demand per replenishment cycle. However, when dealing with continuous review the common derivation of the order point, order quantity (s, Q) policy simplify the computati...
Chapter
This paper suggests a reference framework to decide the best method to compute the base stock level in a lost sales and discrete demand context given a target fill rate. Under this context, only (Guijarro et al. in Eur J Oper Res 218(2):442–447, 2012a) propose an exact fill rate expression, but it requires a huge computational effort. However, the...
Article
This paper focuses on computing on-hand stock levels at the beginning of a replenishment cycle for a lost sales inventory system with periodic reviews and discrete demand. A base-stock policy is used for replenishments. The literature provides an Exact method which requires a huge computational effort, and two closed-form approximate methods that a...
Article
Purpose: The exact estimation of the fill rate in the lost sales case is complex and time consuming. However, simple and suitable methods are needed for its estimation so that inventory managers could use them.Design/methodology/approach: Instead of trying to compute the fill rate in one step, this paper focuses first on estimating the probabilitie...
Chapter
Jigsaw technique is a collaborative learning technique that can be used as an alternative to conventional teaching methods. Basically this technique boosts group work cohesion since each member of the group is in charge of one part of the learning objective of the whole group. This work shows the experience of using the jigsaw technique in an under...
Article
This paper focuses on the multi-item problem where it is necessary to reach an overall stock availability of the spare parts while minimising involved costs. Over the last years, a number of authors have proposed a variety of approaches and provided different rules in order to classify items in ABC classes. An additional optimisation has to be perf...
Conference Paper
The fill rate is defined as the fraction of demand that is directly satisfied with the on-hand stock. Despite its definition is apparently simple, in the literature we find different interpretations and consequently different methods to compute it. In the majority of related works, the fill rate is computed by using the traditional approximation, w...
Conference Paper
We consider four existing methods in order to determine individual fill rates when a global target fill rate has been established. Given the drawbacks of these approaches, needing numerical optimization and especially unsuitable in the context of spare parts, we present a new approach which provide a closed form formula more focused on the characte...
Chapter
In stock management system with inventory management policy (s,Q), managers sometimes find that is a spread between the level of service they have calculated and the real one. This is because there are exact and approximate ways of calculating CSL (cycle service level). The former is difficult to calculate (and not normally used in business), and t...
Chapter
The fill rate is the fraction of demand that is satisfied directly from shelf. In the literature, this service metric is usually computed by using the traditional approach, which calculates the fill rate as the complement of the quotient between the expected unfulfilled demand and the expected demand per replenishment cycle, instead of directly the...
Conference Paper
Cost models and service models are usually considered as equivalent, so that stock out penalty costs can replace service level constraints without loss of generality. However recent developments show that service models are more general than cost models. Moreover, not only there is not a generally accepted procedure for the estimation of stock out...
Article
Full-text available
This paper presents two new approximations to compute the Cycle Service Level (CSL) in a continuous review policy, as a tool for corporate entrepreneur. These approximations are not only for the backordering case but also for the lost sales one. In order to develop it we focus on transforming a form of periodic review policy in a model of continuou...
Article
Full-text available
An exact method for the estimation of the cycle service level has been proposed for periodic review stock policies in a discrete demand context for any known i.i.d. demand distribution. However, the implementation of this method in real environments has previously to manage some important and eventually cumbersome issues such as: (i) the identifica...
Article
Recent developments on the fill rate estimation in periodic review stock policies provide new techniques for setting up the stock policy parameters including exact procedures. However, the implementation of this method in real environments may be a difficult task due to issues such as the availability of demand data, the identification of an approp...
Article
Full-text available
Purpose: This paper focuses on the improvement of the inventory management of repairable parts of the airline company Air Nostrum. The company uses a common sales replacement policy to manage their repairable parts and the same target fill rate for every item. This target is very high in order to assure a high availability of the aircrafts, dealing...
Article
Full-text available
The purpose of this paper is to establish, devise and verify empirically a model which, from an analysis of labour climate, enables feedback to be obtained on management performance with regard to motivation practices and policies in human resources. Failure to build linear models for linking employee satisfaction and human resources policies has l...
Article
In industrial and service corporations, efficiency is an important objective related to the profits and the long-term future of the company. Nevertheless, the objectives of the Public Administration are not always related so directly to efficiency but to people’s welfare and civil rights. Unfortunately, if there is no efficient control of the publi...
Article
The primary goal of this paper is the development of a generalized method to compute the fill rate for any discrete demand distribution in a periodic review policy. The fill rate is defined as the fraction of demand that is satisfied directly from shelf. In the majority of related work, this service metric is computed by using what is known as the...
Article
Full-text available
It is commonly assumed that intermittent demand appears randomly, with many periods without demand; but that when it does appear, it tends to be higher than unit size. Basic and well-known forecasting techniques and stock policies perform very poorly with intermittent demand, making new approaches necessary. To select the appropriate inventory mana...
Article
Full-text available
The fill rate is usually computed by using the traditional approach, which calculates it as the complement of the quotient between the expected unfulfilled demand and the expected demand per replenishment cycle, instead of directly the expected fraction of fulfilled demand. Furthermore the available methods to estimate the fill rate apply only unde...
Chapter
Abstract This paper focuses on the improvement of inventory policies of repairable parts of the airline company Air Nostrum. The company uses the sales replacement policy to manage their repairable parts and the base stock is determined by means of an approximated expression of the fill rate assuming Poisson distributed demands. However, this paper...
Chapter
One of the most common criteria used to measure the performance of a inventory system is the fill rate. In the literature we find two easy-to-compute approaches: the traditional and the Hadley-Whitin approximations, but unfortunately they only apply for normally distributed demand. In practice stock managers can use any of them, even when demand is...
Article
The paper proposes a method to compute the exact cycle service level for (s, Q) continuous review policy in the presence of undershoots and discrete demand in the discrete time domain. Prior to this, it is necessary to review the definition of the cycle service level in order to avoid the problems that can be found when applied it to the periodic r...
Article
Full-text available
Purpose: One of the most usual indicators to measure the performance of any inventory policy is the mean stock level. In the generalized base stock, periodic review policy, the expected mean stock during the replenishment cycle is usually estimated by practitioners and researchers with the traditional Hadley-Whitin approximation. However it is not...
Article
Purpose: One of the most usual indicators to measure the performance of any inventory policy is the mean stock level. In the generalized base stock, periodic review policy, the expected mean stock during the replenishment cycle is usually estimated by practitioners and researchers with the traditional Hadley-Whitin approximation. However it is not...
Article
The parameters of stock policies are usually determined to minimize costs while satisfying a target service level. In a periodic review policy the time between reviews can be selected to minimize costs while the order-up-to-level is based on the fulfilment of a target service level. Generally, the calculation of this service measurement is obtained...
Article
Full-text available
Los repuestos reparables juegan un importante papel en diferentes industrias debido al impacto que producen en la disponibilidad de los diferentes productos así como en los costes de inventario. Cuando se trata con repuestos reparables se consideran elementos con un alto coste, de manera que resulta más interesante repararlos que desecharlos y adqu...
Article
Full-text available
En el presente artículo se definen métodos para calcular las desviaciones en el punto de pedido, llamadas "undershoot", en la literatura sobre gestión de inventarios. Se realiza una exhaustiva revisión de la literatura existente en referencia a los métodos de estimación de los undershoot en las distintas políticas de gestión de inventarios y cómo,...
Conference Paper
One of the most usual measures of customer service is the cycle service level (CSL) which indicates the specific probability of no stockout per replenishment cycle. This definition can be applied to any stock policy and demand pattern, given a known stock level at the beginning of the cycle. Some approximations have been used to compute this stock...
Chapter
The Inventory and Transportation Problem (ITP) can be seen as a generalisation of the Periodic Vehicle Routing Problem that takes into consideration the inventory costs, plus a set of delivery frequencies instead of a single delivery frequency for each shop. Additionally, the ITP can also be viewed as a generalisation of the Inventory Routing Probl...
Article
In this paper a new problem called Assembly Line Worker Assignment and Balancing Problem (ALWABP) is introduced. This problem arises in those assembly lines where we have certain limited resources available (normally workers) in which the operation time for every task is different depending on who executes the task, and where there are also some ta...
Article
This paper examines supply chain management as implemented in companies which deal simultaneously with forward and reverse logistics. Modeling constraints include the strategic and operational alignments, system interoperability, information share and coordination of activities. The proposed Integrated Model for Supply Chain Management (IMSCM) is a...
Article
Current practices for the treatment of the physically and/or mentally handicapped prescribe meaningful job activity as a means towards both a more fulfilling life and societal integration. In many countries, these practices have facilitated the development of many Sheltered Work Centres for Disabled.In the case study presented, a reengineering proc...
Conference Paper
Full-text available
EVITA, standing for Evolutionary Inventory and Transpor- tation Algorithm, aims to be a commercial tool to address the problem of minimising both the transport and inven- tory costs of ar etail chain that is supplied from ac entral warehouse. In this paper we study different issues involved in finding the appropriate settings for EVITA, so that it...
Article
Usually it is assumed that intermittent demand appears at random, with many periods without demand, but when it does, it tends to be higher than unit size. The basic and well known forecasting techniques and stock policies perform very poorly with intermittent demand, so new approaches have to be considered. In order to select the appropriate inven...
Article
This paper is focused on the exact calculation of the cycle service level for a generalized periodic review system accepting any discrete demand with a known probability function and any cycle service target. Previously, it was necessary to modify the definition of the cycle service level metric (also known as non stock out probability) so that it...
Conference Paper
In this paper we address the joint problem of minimising both the transport and inventory costs of a retail chain that is supplied from a central warehouse. We propose a hybrid evolutionary algorithm where the delivery patterns are evolved for each shop, while the delivery routes are obtained employing the multistart sweep algorithm. The experiment...
Article
During the designing phase of a retail chain, a very important decision appears to fulfil the client service target with the total minimum cost as a trade-off between inventory management policies for each shop and delivery policies from the central warehouse. This balance is the basis for key decisions, such as inventory planning, space allocated...
Conference Paper
In this paper we propose new advances towards the development of a commercial tool to address the inventory and transportation problem, i.e. the problem of minimising both the transport and inventory costs of a retail chain that is supplied from a central warehouse. On the first level, we employ an evolutionary algorithm to evolve the delivery patt...
Article
Full-text available
El comportamiento de la demanda varía enormemente en diferentes sectores de actividad pero, con pequeñas variaciones, en las cadenas de tiendas de productos de consumo: (a) existe un elevado número de artículos en la tienda, a veces incluso decenas de miles; (b) un pequeño porcentaje de los artículos presenta demanda en todos los períodos, pero la...
Conference Paper
"No standard ERP can cope with our production complexity" is a well-established belief in the stone industry. This document explains the rationale for this opinion, different techniques and concepts to manage the production complexity in this industry and the key benefits obtained.
Article
Full-text available
RESUMEN Aunque la necesidad de planificar la producción con la presencia de listas de materiales invertidas y estructuras alternativas de producto aparece en numerosos sectores de actividad, ha recibido poca atención de la literatura especializada. En este trabajo se define este problema, se presentan ejemplos de aplicación práctica y se propone un...
Article
Full-text available
The Inventory and Transportation Problem (ITP) can be seen as a generalisation of the Periodic Vehicle Routing Problem that takes into consideration the inven-tory costs, plus a set of delivery frequencies instead of a single delivery frequency for each shop. Additionally, the ITP can also be viewed as a generalisation of the Inven-tory Routing Pro...
Article
Full-text available
Resumen— El problema de Transporte e Inventa-rio (Inventory and Transportation Problem, ITP) puede entenderse como una generalización del problema de enrutado de vehículos periódico que tiene en conside-ración los costes de inventario, además de una serie de frecuencias de reparto en lugar de una sola fre-cuencia para cada tienda. Asimismo, el ITP...
Article
Full-text available
En la actualidad uno de los aspectos de la dirección de operaciones que precisa de mayor investigación es el desarrollo de modelos y métodos para el diseño sistemático de los almacenes en su dimensión estratégica, es decir, la elección de los recursos, procesos y políticas de organizativas a partir de las cuales se realizar el diseño táctico detall...
Article
Full-text available
Palabras clave: gestión de inventarios, demanda intermitente 1. Introducción En muchas industrias, la gestión del inventario se ha convertido en un elemento estratégico clave que determina el éxito o fracaso de objetivos importantes para la organización, como es, entre otros, cumplir con un nivel de servicio determinado a priori, manteniendo unos c...
Article
Contenido: Sistemas de identificación de materiales; Modelo de funcionamiento; Gestión operativa y control; Ejercicios prácticos; Caso para estudio.

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Projects (3)
Project
The challenge to build the "phisical internet" at the Agriculture sector, involving sustainability and collaborative networks.
Project
The City as place for living. Most Citizens move, work, and live in urban areas.