Solved problems about direct time study

A set of problems about direct time study is proposed. Its complete resolution is also offered.Maheut, JPD. (2022). Solved problems about direct time study. http://hdl.handle.net/10251/18103

Multi-Criteria Analysis for the Evaluation of Urban Freight Logistics Solutions: A Systematic Literature Review

[EN] The tension between city logistics and its impact on sustainable urban development is evident. Often, local environmental decisions overlook the effects on urban freight logistics, lacking consideration for stakeholders. To address this, utilizing multi-criteria analysis becomes relevant for informed urban planning and management decision making. In this context, this paper conducts a systematic literature review from 2012 to 2022, focused on implementing the multi-criteria analysis methodology to evaluate alternatives for solutions in urban freight logistics. The PRISMA tool was used in the review to select publications and categorize the information obtained to address the research questions. Results display the most prominent authors and publications, authors¿ country affiliations, annual publication frequency, research objectives, used frameworks, involved actors, defined evaluation criteria, types of alternatives for solutions considered, and MCDM methods applied. The main finding is that the most commonly used MCDM methods were AHP hybrid followed by MAMCA. In addition, no clear correlation between the pursued objectives and the MCDM methods employed by the researchers is identified. It is important to note that all publications with the highest number of citations use fuzzy methods in their analyses.Alvarez Gallo, S.; Maheut, J. (2023). Multi-Criteria Analysis for the Evaluation of Urban Freight Logistics Solutions: A Systematic Literature Review. Mathematics. 11(19). https://doi.org/10.3390/math11194089111

“KPJ Airlines” case study

In this case study, a warehouse should be designed. The case is particular because the products are seats for planes.Maheut, JPD.; García Sabater, JP. (2022). “KPJ Airlines” case study. http://hdl.handle.net/10251/18077

Modelos y Algoritmos Basados en el Concepto Stroke para la Planificación y Programación de Operaciones con Alternativas en Redes de Suministro

En la segunda mitad del siglo XX se comenzó a desarrollar la gestión de materiales de productos multinivel. En ese momento, se decidió que lo verdaderamente relevante, era la gestión de los materiales. De este modo, los modelos de datos que se desarrollaron a partir de entonces, se enfocaron en estructurar con detalle las relaciones entre materiales. La herramienta/metodología para gestionarlos pasó a denominarse Material Requirement Planning (MRP). Posteriormente, cuando el MRP fue entendido, y la tecnología comenzó a permitirlo, los modelos de datos evolucionaron y se incorporó la información necesaria para la gestión de los recursos. En estas estructuras de datos, tanto los materiales como los recursos que hacían falta para fabricar un producto final se asociaban a éste último. Esta forma de asociar todos los productos necesarios (producto hijos) y los recursos a inmovilizar para la obtención de un único producto denominado ¿producto padre¿ se denominó estructura Gozinto. Este origen, probablemente, marcó un ¿efecto candado¿ (lock-in) en la manera de abordar la planificación de los requerimientos de Materiales y de Recursos y, sobre todo, de las operaciones en su sentido más genérico. Durante la implantación de algunas herramientas de planificación en empresas y a partir de la revisión del estado del arte sobre dichas herramientas, hemos detectado varias oportunidades de investigación. De entre ellas nos hemos centrado en entender cuales son los requisitos necesarios para que las herramientas de planificación y programación de las operaciones pudieran ser flexibles y adaptadas a cualquier sector industrial. Para ello, en esta tesis vamos a estudiar la evolución de las estructuras de datos y propondremos una nueva estructura de datos más genérica, basada en el concepto de stroke que extiende el concepto de lista de materiales más allá de las estructuras tradicionales presentes en las herramientas comerciales existentes. Esto nos permitirá dar soporte a la planificación y programación de manera más generalizada, pudiendo abarcar cualquier operación, incluso sus alternativas en entorno multi-planta. Al mismo tiempo se podrán desarrollar los modelos de programación matemática, algoritmos y los mecanismos de coordinación necesarios para resolver los modelos e implantarlos en herramientas integradas para su uso industrial. Esta tesis se plantea como una colección de 10 artículos científicos, el orden en que están situados en la tesis permite mantener una secuencia lógica construida a posteriori y no según el orden cronológico en el que fueron escritos.Maheut, JPD. (2013). Modelos y Algoritmos Basados en el Concepto Stroke para la Planificación y Programación de Operaciones con Alternativas en Redes de Suministro [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/29290TESI

"Trick or Treat Sweets II" Case study

In this case study, students should advise a company that produces sweets on how to set up the Operations system (Layout design, Supply plan, HHRR decisions, Process design, etc.)Maheut, JPD.; García Sabater, JP. (2022). "Trick or Treat Sweets II" Case study. http://hdl.handle.net/10251/18076

“Piensos JK” Case study

In this case, a mathematical model to solve a problem of distribution planning is introduced.Maheut, JPD.; García Sabater, JP. (2022). “Piensos JK” Case study. http://hdl.handle.net/10251/18077

“The chemists of the towns of l’Alcudia, Carlet and Benimodo” Case study

In this case study, a real situation to organize shift assignments for chemists in the Valencian Region is proposed. The current situation should be analised and solutions should be designed.Maheut, JPD.; García Sabater, JP. (2022). “The chemists of the towns of l’Alcudia, Carlet and Benimodo” Case study. http://hdl.handle.net/10251/18077

A decision support system for modelling and implementing the supply network configuration and operations scheduling problem in the machine tool industry

[EN] This paper presents a decision support system to simultaneously solve the supply network configuration problem and the operations scheduling problem for the machine tool industry. A novel database structure, which is able to consider alternative operations and alternative bills of material, has been used. An algorithm for complete enumeration to determine all the feasible solutions using stroke graphs is introduced. A multiagent-based simulator evaluates the different key performance indicators that the supply network deals with for each alternative solution (e.g. workload, profits, delivery times, etc.) to determine that ‘satisficed’ by the collaborative decision-making among its members. A case study based on a Spanish company that assembles highly customised machines and tools in several European plants is considered. From the experiments results based on data linked to this industry, it will be demonstrated that the tool is potentially useful for stakeholders and for the central decision-maker to make decisions collaboratively in a multisite context caseWe thank the EWG-DSS and their four expert anonymous referees as well as the guest editorial board for their useful suggestions and criticism on earlier versions of this paper. The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. NMP2-SL-2009-229333 and has been partially supported by the Spanish Ministry of Science and Innovation within the 'Proyectos de Investigacion Fundamental No Orientada Programme' through Project 'CORSARI MAGIC DPI2010-18243'. Julien Maheut holds a VALi+d grant funded by the Regional Valencian Government (Ref. ACIF/2010/222).Maheut, JPD.; Besga, JM.; Uribetxebarria, J.; García Sabater, JP. (2014). A decision support system for modelling and implementing the supply network configuration and operations scheduling problem in the machine tool industry. Production Planning and Control. 25(8):679-697. https://doi.org/10.1080/09537287.2013.798087S67969725

“KaPeJu Titanium knees” case study

In this case study, an inventory management problem is introduced.Maheut, JPD.; García Sabater, JP. (2022). “KaPeJu Titanium knees” case study. http://hdl.handle.net/10251/18077

“Trick or Treat” case study

In this case study, a company should design a new operations system in order to offer a new type of product to its unique customer. Aspects like the SC description and analysis, the supplier selection, the design of a supply plan can be treated.Maheut, JPD.; García Sabater, JP. (2022). “Trick or Treat” case study. http://hdl.handle.net/10251/18076