Romero-Silva, Rodrigo

Main Affiliation

Facultad de Ingeniería - CampCM

Preferred name

Official Name

Romero Silva, Rodrigo

ORCID

0000-0002-5912-1021

Now showing 1 - 10 of 22

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Performance of merging lines with uneven buffer capacity allocation: the effects of unreliability under different inventory-related costs
(2020)
Shaaban, Sabry
;
Romero-Silva, Rodrigo
This simulation study investigates whether machine efficiency, mean time to failure (MTTF) and mean time to repair (MTTR) significantly affect the performance of uneven buffer capacity allocation patterns for merging lines. Also studied is the trade-off between increasing throughput via bigger buffers and their associated inventory-related costs, since previous studies have shown that higher overall buffer capacity and higher average inventory content result in higher throughput. Results suggest that an ascending buffer allocation pattern (concentrating buffer capacity towards the end of the line) produces higher throughput in shorter, more unreliable lines; whereas the balanced pattern shows better performance in longer, more reliable lines. Increasing average buffer capacity per station and/or having higher average buffer content was found to be more cost-effective in lines with lower machine inefficiency, shorter MTTF and MTTR, and longer lines. Results differed between reliable and unreliable lines since reliable lines were particularly penalised by buffer capacity investiment/maintenance costs due to a relatively low increase in throughput resulting from the addition of extra buffer capacity.
1 5Scopus© Citations 13
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Supply Chain Management Theory in the Context of Populism
(Springer Nature Singapore, 2024)
Marsillac, Erika
;
Romero-Silva, Rodrigo
Businesses today rely on global supply chains that must coexist with global political ideologies. As populist ideologies become more prevalent in the twenty-first century, they therefore become a significant influence on modern supply chain management practices. This entry briefly examines and broadly describes how current populist perspectives, particularly for economic protectionism, integrate with today’s supply chain management theories and strategic activities. ©The authors ©Springer Nature.
11
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A framework for studying practical production scheduling
(2014)
Romero-Silva, Rodrigo
;
Santos, Javier
;
Hurtado-Hernandez, Margarita
The aim of this paper is to present what we believe are the most relevant findings and results regarding practical scheduling in order to define practical production scheduling and create a framework that helps researchers to study the various topics that fall under the umbrella of practical production scheduling and to identify the current state of knowledge for each topic. Studies from different fields were analysed and included in this paper, contributing significant knowledge to build a definition of practical production scheduling. Finally, we discuss the applicability that scheduling, as a task, could have in real companies.
Scopus© Citations 14 1 6
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The impact of unequal processing time variability on reliable and unreliable merging line performance
(2021)
Romero-Silva, Rodrigo
;
Shaaban, Sabry
;
Marsillac, Erika
;
Laarraf, Zouhair
Research on merging lines is expanding as their use grows significantly in the contexts of remanufacturing, reverse logistics and developing economies. This article is the first to study the behavior of unpaced, reliable, and unreliable merging assembly lines that are deliberately unbalanced with respect to their coefficients of variation (CV). Conducting a series of simulation runs with varying line lengths, buffer storage capacities and unbalanced CV patterns delivers intriguing results. For both reliable and unreliable lines, the best pattern for generating higher throughput is found to be a balanced configuration (equal CVs along both parallel lines), except for unreliable lines with a station buffer capacity of six. In that case, the highest throughput results from the descending configuration, i.e. concentrating the variable stations close to the beginning of both parallel lines and the steady stations towards the end of the line. Ordering from the least to most steady station also provides the best average buffer level. By exploring the experimental Pareto Frontier, this study shows the combined performance of unbalanced CV patterns for throughput and average buffer level. Study results suggest that caution should be exercised when assuming equivalent behavior from reliable and unreliable lines, or single serial lines and merging lines, since the relative throughput performance of some CV patterns changed between the different configurations.
Scopus© Citations 5 1 6
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Exploiting the characteristics of serial queues to reduce the mean and variance of flow time using combined priority rules
(2018)
Romero-Silva, Rodrigo
;
Shaaban, Sabry
;
Marsillac, Erika
;
Hurtado-Hernandez, Margarita
This paper addresses the trade-off challenge from reducing either the mean or variance of flow time when using simple sequencing rules in balanced, multi-class, serial queues. Study results show that instead of the expected zero sum situation, a balance between the two objectives can be achieved by assigning different priority rules to different queues. The order of priority rule assignments in different queues is shown to be relevant because variability along the line creates unbalanced queue lengths for each station, depending on the characteristics of the line. Thus, it was found that a simple heuristic for reducing both the mean and the variance of flow time in non-heavy traffic environments is to assign the first queue a priority rule that reduces its mean queue length while assigning the other queues a priority rule that reduces the variance of flow time. Conversely, for very-high traffic environments, performance improvements are shown from assigning the first queue a priority rule that reduces the variance of flow time while assigning the other queues a priority rule that reduces queue length. © 2017 Elsevier B.V.
Scopus© Citations 23 1 8
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The effects of supply variability on the performance of assembly systems
(2022)
Romero-Silva, Rodrigo
;
Hurtado-Hernandez, Margarita
Assembly processes play a big role in the current business context as global supply chains depend on many subcomponents to produce a single finished product. Previous studies have shown contrasting results regarding the effect that supply variability (the variability of feeding stations) has on the performance of assembly systems, as opposed to the variability of the station matching and assembling the components. This paper aims to close this gap by studying the behaviour of simple assembly systems with differing degrees of variability allocation among the stations through an experimental simulation study. Results suggest that a reduction in feeding station variability results in higher throughput, even in systems where the variability of one of the feeding stations increases while the other decreases. Furthermore, in scenarios with high total variance, the highest throughput is reached by transferring both variance and work from one of the feeding stations to any other station, whereas in low variance systems symmetrical work transfer to the feeding stations results in the highest throughput, as previously shown. Finally, reducing feeding station variability decreased the time spent in the assembly station (waiting time for component matching plus time for the assembly operation) only in experiments with high total variance. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Scopus© Citations 3 1 11
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A conceptual framework of the applicability of production scheduling from a contingency theory approach: addressing the theory-practice gap
(Taylor & Francis Group, 2022)
Romero-Silva, Rodrigo
;
Santos, Javier
;
Hurtado-Hernandez, Margarita
In the last century, there was a general perception that scheduling theory was highly irrelevant to scheduling practice. Many recent studies, however, have suggested that the applicability of scheduling approaches is highly intertwined with the manufacturing environment in which the scheduling task is carried out. In this paper we used the constructs of Contingency Theory to suggest specific fits between scheduling approaches and manufacturing environments, after suggesting that the theory-practice gap in production scheduling research has been caused by three issues: (a) simplification of scheduling problems, (b) simplification of the practical scheduling task as a decision process, and (c) lack of relevance of the traditional scheduling approach to all manufacturing environments. Furthermore, we suggest that the dynamism of the state of the system and the complexity of the scheduling problem are the two constituting vectors that define the complexity of the scheduling task. We use both vectors to identify different types of manufacturing environments and propose specific fits with scheduling approaches. Finally, we hypothesize that the fit between scheduling approaches and manufacturing environments is only relevant in environments with high resource utilization where the scheduling task could have a bigger impact on a firm’s performance, and present three case studies to better exemplify the relevance of the conceptual framework. ©2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Scopus© Citations 9 2 15
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Alineación entre métodos y necesidades de programación de la producción
(2016)
Romero-Silva, Rodrigo
;
Santos García, Javier
;
Hurtado-Hernandez, Margarita
Este artículo sugiere una alineación entre entornos de producción y metodologías de programación de la producción de acuerdo a las necesidades de programación de cada tipo de entorno de producción. El estudio considera dos tipos de entornos de planificación y, dependiendo de sus necesidades de planificación, propone los métodos que mejor se puedan ajustar para soportar la tarea de la programación de la producción
Scopus© Citations 2 1 11
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Trade-offs in the landside operations of air cargo hubs: Horizontal cooperation and shipment consolidation policies considering capacitated nodes
(2022)
Mujica Mota, Miguel
;
Romero-Silva, Rodrigo
Landside operations in air cargo terminals consist of many freight forwarders (FFWs) delivering and picking up cargo at the capacity-constrained loading docks at the airport's ground handlers' (GHs) facilities. To improve the operations of the terminal and take advantage of their geographical proximity a small set of FFWs can build a coalition to consolidate stochastically-arriving shipments and share truck fleet capacity while other FFWs continue bringing cargo to the terminal in a non-cooperative manner. Results from a detailed discrete-event simulation model of the cargo landside operations in Amsterdam Aiport showed that all operational policies had trade-offs in terms of the average shipment cycle time of coalition FFWs, the average shipment cycle time of non-coalition FFWs, and the total distance traveled by the coalition fleet, suggesting that horizontal cooperation in this context was not always beneficial, contrary to what previous studies on horizontal cooperation have found. Since dock capacity constitutes a significant constraint on operations in air cargo hubs, this paper also investigates the effect of dock capacity utilization and horizontal cooperation on the performance of consolidation policies implemented by the coalition. Thus, we built a general model of the air cargo terminal to analyze the effects caused by dock capacity utilization without the added complexity of landside operations at Amsterdam Airport to investigate whether the results hold for more general scenarios. Results from the general simulation model suggest that, in scenarios where dock and truck capacity become serious constraints, the average shipment cycle times of non-coalition FFWs are reduced at the expense of an increase in the cycle times of FFWs who constitute the coalition. A good balance among all the performance measures considered in this study is reached by following a policy that takes advantage of consolidating shipments based on individual visits to GH.
Scopus© Citations 4 1 16
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A note on defining organisational systems for contingency theory in OM
(2018)
Romero-Silva, Rodrigo
;
Santos, Javier
;
Hurtado-Hernandez, Margarita
This paper aims to improve the applicability and relevance of contingency theory research in the field of Operations Management. Based on the results of previous studies, we have identified a systems-based single definition of organisation types that could describe the fit between organisational environment and organisational structure. This definition of organisation type, which we call an ‘organisational system’, regards the organisation as an integrated whole instead of as a sum of its parts and can help to better classify organisations in order to identify fits between organisation types and emerging practices in Operations Management. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
1 8Scopus© Citations 33

Romero-Silva, Rodrigo

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