ESTG - DM - Métodos de Apoio à Decisão Empresarial
Permanent URI for this collection
Browse
Browsing ESTG - DM - Métodos de Apoio à Decisão Empresarial by advisor "Borges, Ana"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Automobile repair scheduling: a real casePublication . Pilar, Maria de Fátima dos Santos; Silva, Eliana Costa e; Borges, AnaScheduling represents a classic combinatorial problem, which has been extensively studied in Operational Research (OR). These type of problems arise in several economic domains, and in spite of the great variety of studies present in the literature, few are those that portray problems in the automobile sector, particularly in the scheduling of car maintenance tasks, and that use real data for their resolution. This project will portray the case of a Portuguese rm in the automobile sector, in the branch located in Porto, focusing on the repairs performed at its mechanical section. The process of each vehicle that arrives at the repair shop starts by the opening of a repair order (RO) form, indicating the necessary mechanical repairs to be performed. Next the repair shop manager assigns the repair tasks to one of the eight mechanics available in this repair shop. This study intends to develop a mathematical model that, using data provided by the rm, would allow to improve the scheduling of the repairs, considering the mechanics and resources available, the necessary interventions to perform and the execution time of each one of these interventions. The aim is to reduce the time of inactivity of the vehicles between interventions, as well as increasing the productivity of the mechanics' work. For this, a Mixed Integer Linear Programming (MILP) model will be developed, combining linear ordering variables to sequence the interventions performed in each vehicle, assignment variables and linear variables for start times. The problem will be formulated and solved using the AMPL modeling language, using the Gurobi solver, to solve the real instances tested. With the application of the developed model, the vehicles' interventions scheduling will be performed in a suitable form, reducing both the downtime between the vehicles' interventions as well as the downtime of mechanics, and therefore improve productivity. The results show that all the necessary mechanical interventions are correctly schedule and there is a decrease in the downtimes.
- Capital Structure on Portuguese SMEs: the role of innovation and internationalization during financial crisisPublication . Soares, Luis Filipe Henriques; Duarte, Fábio; Borges, AnaThe most recent international financial crisis has hit the heart of european countries, especially peripheral ones, with impact on the financial system liquidity and its ability to lend to companies. Especially for small and medium-sized enterprises (SMEs) operating in a bank-based system such as in Portugal, this scenario might not only modify the way firms use debt but also their business strategies related with innovation and internationalization have been seen as fundamental practices to contribute to firm's competitiveness and business diversification. However, little is known about the capacity of firms to finance these types of activities...
- Determinants of financial performance during macroeconomic turbulencesPublication . Coelho, Fernando Rui Barbosa; Duarte, Fábio; Borges, AnaDespite a broadly studied topic, only a small part of literature on business performance explicitly devotes attention to the causality effects between organizational behavior, business strategies or economic environment and (ex post) firm performance. The majority of studies addresses the topic for firms listed in the stock market and none of them explicitly analyzes the role of macroeconomic turbulences on business performance in a bank-based system. Overcoming this empirical gap, this study addresses the performance of SMEs operating in the wholesale of electrical household appliances sector. Our results revealed that there is a U-Shaped relation between performance, age, and debt-to-equity ratio. First hand results are provided about the relation between innovation, internationalization, tangibility, liquidity, ownership structure and Portuguese SMEs’ business performance belongs to NACE 46430. Macroeconomic turbulences revealed a crucial role on financial performance.