Centre for Business and Economics Research - University of Coimbra

Funder

Fundação para a Ciência e a Tecnologia

Organizational Unit

Publications

Perspectivas sobre o uso da informação financeira pública pelos políticos: resultados recentes e desafios futuros

Publication . Nogueira, Sónia P.; Jorge, Susana

2024Journal article

Open access

Failure simulation in software-defined networks with differential link availability

Publication . Melo, Paulo; Jorge, Luisa; Gomes, Teresa

In Software-Defined Networks (SDN) the placement of controllers is an important factor for overall network reliability. Whereas most studies assume that all links have similar link failure rates/availability, placing controllers taking into account differences in link availability can yield advantages. This is even more relevant if the network is designed with a particular subset of high availability links (a spine). After presenting integer linear programming formulations to support controller placement considering differential link availability, we propose a simulation approach to verify the reliability change due to that placement. From a simulational study using 2 networks, 30 different link availability configurations we found a definite advantage in overall reliability in using the knowledge of high availability links to place the controllers. However, while there were also advantages to using certain spines for individual networks, these advantages were not uniform, and varied according to networks, the number of controllers placed and link availability ratio. Further work is suggested to check whether fault patterns may influence the reliability advantage of individual spines.

2021Conference paper

Open access

Multiclass data plane recovery using different recovery schemes in SDN: a simulation analysis

Publication . Jorge, Luisa; Melo, Paulo; Gomes, Teresa

To provide dependable services SDN networks need to be resilient to link or switching node failures. This entails, when faults occur, ensuring differentiated types of recovery, according to carried traffic, to routing paths. However, the choice of the recovery scheme best suited to each traffic class is not direct, nor is obvious the impact of the combination of various recovery schemes, according to traffic classes. We explore the usage of different recovery schemes for traffic with distinct requirements Simulation analysis confirms that using different recovery schemes for distinct types of traffic does create differentiated effects in terms of traffic carried and bandwidth usage.

2022Conference paper

Open access

Measuring the use of financial information by politicians in local government

Publication . Jorge, Susana; Gomes, Patrícia; Pimentel, Liliana; Baião, Lara; Nogueira, Sónia P.

The importance of making financial information (FI) available to politicians is well recognized. However, despite the recent attention by scholars to the use of FI in political contexts and by politicians, empirical research has failed to produce accurate tools to assess the degree to which politicians make use of FI. This exploratory study proposes a new tool to analyse levels of FI use— the FIU Index. The level of use is assessed by the number of times an FI term is mentioned by politicians. A test case using the new index in Portuguese municipalities illustrates its potential.

2024Journal article

Restricted access