1,721,130 research outputs found
Erratum to: “A sustainable EOQ model: Theoretical formulation and applications” [Int. J. Prod. Econ. 149 2014 145–153] (International Journal of Production Economics (2014) 149 (145–153), (S092552731300296X), (10.1016/j.ijpe.2013.06.026))
No full textIn this erratum, we correct a typo in the formulations, due to the omission of one parameter, that appears in our paper “A sustainable EOQ model: Theoretical formulation and applications” (Battini, D., Persona, A., Sgarbossa, F., 2014). Erratum In the paper (Battini, D., Persona, A., Sgarbossa, F., 2014), equation (6) presents one typo, since the parameter b (space occupied by a product unit [m3/unit]) is omitted. The correct equation (6) and related equations (10)–(12) are as follows: [Formula presented] [Formula presented] [Formula presented] [Formula presented] This typo about the parameter b is also in equation, based on the same approach of equations (6) and (10). The correct equation (18) and related equations (19)–(21) will be: [Formula presented] [Formula presented] [Formula presented]. Finally, we would like to take this opportunity also to inform the reader that there are other small typos, due to the copy and paste of values formatting table 4 of Battini et al. (2014). These typos are not related to the previous omission of the parameter b. The correct value of the C(EOQ) in Case 2 is 417,336.47 instead of 419,719.47, the correct value of C(S-EOQ) is 418,990.90 instead of 421,367.07 and the internal transportation cost is 7530.59 instead of 9910.59. As a consequence, also Fig. 5 at Battini et al. (2014), representing these values, will be slightly different. Acknowledgements We would like to thank Leopoldo Eduardo Cárdenas-Barrón and Alfonso Angel Medina-Santana from Tecnológico de Monterrey, Mexico. Their valuable attention in reading and checking the paper helped us in correcting this typo. Reference Battini, D., Persona, A., & Sgarbossa, F. (2014). A sustainable EOQ model: Theoretical formulation and applications. International Journal of Production Economics, 149, 145-153
Germanium monolayer doping: successes and challenges for the next generation Ge devices
Full text linkThe growing interest in nanoelectronics and photonics, combined with the development of new germanium- based devices, provide the impetus to develop new doping methods suitable to new germanium challenges. The monolayer doping technique is one of the most promising techniques for nanostructure doping, especially for the possibility to perform conformal doping on nanostructured materials, the complete absence of lattice damage, the high control of the dopant and the reduction of the stochastic doping effects. In this paper, works that develop the monolayer doping technique on germanium will be described and analyzed, highlighting advantages and disadvantages of different possible approaches to Ge doping and finally outlining the future steps for the implementation of monolayer doping technique on device manufacturing
Throughput models for a dual-bay VLM order picking system under different configurations
No full textA Joint Assembly Line Balancing and Feeding Problem (JALBFP) considering direct and indirect supply strategies
No full textIn an assembly system, balancing the line and designing the part feeding setting play a fundamental role in guaranteeing efficiency and effectiveness. Although these two aspects are interrelated, they are usually performed subsequent to each other, with the part feeding decisions only being made once the line has already been balanced. However, the simultaneous solving of the assembly line balancing and part feeding problems can lead to interesting benefits. In this paper, an innovative approach for solving the Joint Assembly Line Balancing and Feeding Problem (JALBFP) is proposed, to achieve an integrated balancing of assembly tasks and parts picking/kitting and a fully synchronised assembly-feeding system. The aim is to minimise the operational system cost, including workforce, space and transportation costs. The Mixed Integer Linear Programming (MILP) model is applied to several instances and two case studies and compared to a hierarchical approach. The proposed model leads to a significant improvement in reducing the number of assembly stations required and the inventory level at the line, where space is notoriously scarce, also avoiding workforce oversizing in the feeding system. The strength of the model relies on its formulation and on its versatility, which makes it applicable to different assembly sectors
Challenges and perspectives of the Industry 4.0 technologies within the last-mile and first-mile reverse logistics: A systematic literature review
No full textThe circular economy (CE) and supply chain management (SCM) paradigms were already synthetized within the concept of circular supply chain (CSC) but, recently, also Industry 4.0 has been identified as a disruptive factor in the field of CSC and as key for shifting toward sustainability. The aim of this paper is to evaluate the current contribution of Industry 4.0 technologies in logistics, with a focus in last and first mile activities. The study proposes a three-step methodological approach which includes bibliometric, network and content analyses has been adopted to systematically analyze the scientific literature and to investigate the evolving trends, challenges and perspectives within the last-mile and first-mile reverse logistics research field. From a managerial perspective, this study provides an overview of the potential associated with Industry 4.0 solutions adopted within the logistics management, focusing on interdependencies, possible trade-offs, and less understood pathways. The study has outlined that several gaps still remain present and future research developments should be addressed in this research field starting from in identifying critical points for the simultaneous management of last-mile and first-mile reverse logistics operations and evaluating economic feasibility of Industry 4.0 adoption. This study also provided feedbacks related to support define new business model in order to respond to new requirements deriving from the implementation of circular economy and Industry 4.0 paradigms
Design and simulation of assembly line feeding systems in the automotive sector using supermarket, kanbans and tow trains: a general framework
No full textA growing number of manufacturers are adopting the so-called supermarket strategy to supply components to the production system. Supermarkets are decentralized storage areas used as intermediate warehouses for parts required by the production system (typically assembly lines). Such a feeding system is widely used in the automotive industry where assembly stations in multiple mixed-model assembly lines are usually refilled by means of a systematic part replenishment driven by Kanban systems, adopting small trucking vehicles towing some wagons (tow trains). The aim of this paper is to provide a simple but robust framework in order to design the supermarket/feeding system dedicated to complex multiple mixed-model assembly lines. This framework proposes an integrated approach both for long-term (static analytical model) and short-term (dynamic simulation) problems dealing with Kanban and Supermarket systems dedicated to assembly lines, and the tow train fleet sizing and management. This proposed methodology is applied to a case study derived from the Italian automotive industry, and the results highlight the high interrelation between the long and the short term variables that can be evaluated only by an integrated approach that considers both static and dynamic aspects of the problem. The results of this study are then presented and widely discussed
Additive or Conventional Manufacturing for Spare Parts: Effect of Failure Rate Uncertainty on the Sourcing Option Decision
No full textAgeing workforce management in manufacturing systems: state of the art and future research agenda
Full text linkThe workforce ageing phenomenon is recently affecting most of the Organisation for Economic Cooperation and Development (OECD) member countries, due to a general ageing of their populations and a higher average retirement age of the workforce. In this paper, the topic of ageing workforce management is addressed from a production research standpoint, with the aim of understanding how older workers can be supported and involved in a manufacturing system. First, the current state of the art related to the ageing workforce in production systems is presented. This is structured according to four main topics: (1) analysis and evaluation of ageing workers’ functional capacities, (2) consideration of ageing workers’ capacities in industrial system modelling and management, (3) analysis and exploitation of ageing workers’ expertise, (4) acknowledgement, analysis, design and integration of supporting technologies. Next, the discussion on the impact of the ageing workforce on manufacturing systems’ performances leads to the comparison of some technological advances that are related to the Industry 4.0 paradigms. Finally, a future research agenda on this topic is proposed, based on the same topics classification proposed for the literature analysis. Five different research areas are derived, suggesting future directions for appropriate research concerning the employ of older workers in production environments
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