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- Estudo de caso da gestão de filas em uma unidade de saúdePublication . Ferreira, Janaina Cristina; Geraldes, Carla A.S.; Almeida, João P.; Sousa, João; Monteiro, AndreiaNa área da saúde, é de extrema importância que o atendimento e tratamento do utente seja efetivo, sobretudo executado com rapidez. Com o crescimento da população, as pessoas buscam mais os serviços de saúde, o que afeta a oferta de serviços, profissionais e impacta no tempo de espera. Este estudo foi motivado pelo interesse em otimizar a gestão de filas numa unidade de saúde do distrito de Bragança, visando reduzir os tempos de espera para a realização de serviços médicos, garantindo que o utente seja atendido com qualidade, de forma ética e humana, e com alto nível técnico dos profissionais. O objetivo é reduzir o elevado tempo de espera que os utentes encontram ao solicitarem atendimento na unidade de saúde.
- Analysis of the workforce Skills for the factories of the futurePublication . Leitão, Paulo; Geraldes, Carla A.S.; Fernandes, Florbela P.; Badikyan, HasmikIndustry 4.0 is promoting the digitisation of manufacturing sector towards smart and more efficient factories, seen worldwide as the fourth industrial revolution. However, its complete adoption strongly depends on the skills that existing workforce and future professionals can have in the different dimensions of this multidisciplinary vision, contributing to increase the digital maturity level of companies from the industrial sector. Additionally, new job profiles are emerging to face the implementation of these innovative approaches, which implies the need for the re-qualification and up-skilling of existing workforce, particularly focusing the digital skills. In this context, this paper analyses the gap and impact in the non-technical and technical skills required for the successful transition into digitisation, particularly across six manufacturing areas covering the collaborative robotics (cobots), additive manufacturing, mechatronics and machine automation, data analytics, cybersecurity and humanmachine interface.
- Gestão das operações logísticas num armazémPublication . Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, GuilhermeOs armazéns são elos importantes da cadeia logística, pelo que, no contexto de um mercado global, altamente competitivo e exigente, a sua gestão cumpre um papel muito relevante no que diz respeito quer à obtenção dos níveis de serviço prestados ao cliente quer à minimização dos custos logísticos totais. Neste trabalho é realizada a reestruturação de operações logísticas num armazém. A reestruturação realizada teve por base a implementação dos resultados obtidos por resolução de dois modelos de programação matemática que permitiram redimensionar as áreas funcionais no armazém e localizar os produtos dentro dessas áreas, segundo a política de localização adoptada. As soluções obtidas permitiram não só reestruturar o armazém como abriram lugar ao estudo e implementação de novas estratégias, para posterior optimização do processo de picking.
- Integrated approaches to warehouse planning and operationsPublication . Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, GuilhermeIn this talk we discuss a tactical model recently available in warehouse literature. The model integrates the replenishment decision in inventory management, the allocation of products to warehousing systems and the assignment of products to storage locations in warehousing management. Our aim is to show the models’ potentialities and weaknesses when applied to a wide variety of problems and to identify challenging research opportunities for developing global warehouse decision support models that fill the gap between researchers and warehouse practitioners.
- An automated warehouse design validation using discrete simulationPublication . Peixoto, Robson; Dias, Luís M.S.; Carvalho, Sameiro; Pereira, Guilherme; Geraldes, Carla A.S.In this paper we discuss the use of discrete simulation technique to support the redesign process of an automated warehouse system of the Brazilian Air Force unit. This unit is responsible for the supply of all uniform items and other military support material to their military forces. In particular, our work aims at analysing the inclusion of an automated sorting system to prepare uniforms individual kits in order to release downstream supply chain from this task. The main challenge was to investigate the impact on the existing storage system of a new sorting system and, simultaneously, to explore if additional management measures are required to satisfy both throughput levels and overall supply chain requirements. To accomplish a solution for such a complex problem simulation models were developed using ARENA software. Results have shown that the use of simulation allows not only the assessment of the impact of the new sorting equipment but also to test different warehouse management strategies that should be adopted concurrently to ensure that desired throughput levels can be achieved in the new scenario. In fact, this research illustrates the flexibility of the simulation tool to address several complex management issues simultaneously such as the introduction of picking sequencing rules, the use of a class-based storage policy, the addition of new picking stations, and an increase of the number of the available boxes used for transportation.
- A linear programming model for the storage location assignment problem: a case studyPublication . Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, GuilhermeAn important warehouse operation decision concerns the definition of a storage location policy, including the definition of functional areas and the identification of each stock item location in the warehouse. Empirical approaches are often used. However, they do not guarantee that the lowest cost materials-handling solution is achieved. This paper presents a clustering approach to address the assignment of stock items to particular warehouse functional areas. A linear programming model is adapted to a case study and its performance is assessed through the use of real data. Model is solved using LINGO 9.0 mixed integer commercial solver. The output of this model may also be taken as a starting point for further detailed warehouse operation decisions, especially as far as the optimization of the order picking process is concerned.
- Operational research models in warehouse design and planningPublication . Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, GuilhermeThe design and operation of a warehouse involve many challenging decision problems. In this paper, a literature review on warehousing models is presented. Authors start with a hierarchy of decision problems encountered in setting up warehouse design and planning processes. Next, some operational research decision models and solution algorithms supporting decision making at each discussed level are presented. The aim is to link academic researchers and warehouse practitioners, explaining what planning models and methods are currently available for warehouse design and planning, and what are the future research opportunities.
- An optimisation model for the warehouse design and planning problemPublication . Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, GuilhermeIn spite of the importance of warehouses in the field of the supply chain management, there is not a single decision model that integrates all the decisions that concerns the warehouse design and planning problem. In this paper we discuss a mathematical programming model aiming to support some warehouse management and inventory decisions. Our aim is to address the complexity related to the modeling of the warehouse design and planning problem. In particular an optimisation model is presented to capture the trade-offs among both inventory and warehouse costs in order to achieve global optimal design satisfying throughput requirements.
- Operational research IO 2021—analytics for a better world. XXI Congress of APDIO, Figueira da Foz, Portugal, November 7–8, 2021Publication . Almeida, João P. (Ed.); Geraldes, Carla A.S. (Ed.); Lopes, Isabel Cristina (Ed.); Moniz, Samuel (Ed.); Oliveira, José F. (Ed.); Pinto, Alberto A. (Ed.)This book provides the current status of research on the application of OR methods to solve emerging and relevant operations management problems. Each chapter is a selected contribution of the IO2021 - XXI Congress of APDIO, the Portuguese Association of Operational Research, held in Figueira da Foz from 7 to 8 November 2021. Under the theme of analytics for a better world, the book presents interesting results and applications of OR cutting-edge methods and techniques to various real-world problems. Of particular importance are works applying nonlinear, multi-objective optimization, hybrid heuristics, multicriteria decision analysis, data envelopment analysis, simulation, clustering techniques and decision support systems, in different areas such as supply chain management, production planning and scheduling, logistics, energy, telecommunications, finance and health. All chapters were carefully reviewed by the members of the scientific program committee.
- XVI Congresso da Associação Portuguesa de Investigação Operacional: livro de resumosPublication . Oliveira, José F. (Ed.); Vaz, Clara B. (Ed.); Pereira, Ana I. (Ed.); Geraldes, Carla A.S. (Ed.)