University of Porto

Displaying 1-16 of 16 results

  • White Papers // Jan 2013

    Efficient Time Synchronized One-Time Password Scheme to Provide Secure Wake-Up Authentication on Wireless Sensor Networks

    In this paper, the authors propose time synchronized one-time-password scheme to provide secure wake up authentication. The main constraint of Wireless Sensor Networks is their limited power resource that prevents users from using radio transmission over the network to transfer the passwords. On the other hand, computation power consumption is...

    Provided By University of Porto

  • White Papers // Mar 2012

    Trade-Off Between Cost and Goodput in Wireless

    The authors study the cost of improving the good-put, or the useful data rate, to user in a wireless network. They measure the cost in terms of number of base stations, which is highly correlated to the energy cost as well as capital and operational costs of a network provider....

    Provided By University of Porto

  • White Papers // Jan 2012

    Decision Support Systems in Small Businesses

    Decision support systems are designed to assist managers to make more effective decisions. Potentially, they could provide great benefits to SME managers and enhance managers' decision-making capability. However, the extent of DSS implementation in small business is still low in general, although there is significant variation between different firms. The...

    Provided By University of Porto

  • White Papers // Jan 2012

    Reliability and Availability Evaluation of Wireless Sensor Networks for Industrial Applications

    Wireless Sensor Networks (WSN) currently represent the best candidate to be adopted as the communication solution for the last mile connection in process control and monitoring applications in industrial environments. Most of these applications have stringent dependability (reliability and availability) requirements, as a system failure may result in economic losses,...

    Provided By University of Porto

  • White Papers // Aug 2011

    On the Efficient Implementation of a High Performance Multi-Agent Simulation System for Modeling Cellular Communications Involving a Novel Event Scheduling Algorithm

    Simulation models are used in the design, development and evaluation of wireless communication systems. While basic network entities as Base Stations and users are always taken into account in such simulation modeling, a critical but currently underestimated factor that affects the simulated network behavior is the corresponding simulation model which...

    Provided By University of Porto

  • White Papers // Apr 2011

    The Effects Of Vertical Separation And Access Price Regulation On Investment Incentives

    The authors study the impact of vertical separation between an upstream firm and its subsidiary, which competes in the retail market with an independent firm, with the incentive to invest in network upgrade. This question is discussed under two alternative regimes concerning the price of the vital input sold by...

    Provided By University of Porto

  • White Papers // Jan 2011

    Real-Time Communication in IEEE 802.11 Wireless Mesh Networks: A Prospective Study

    The purpose of this paper is to present an on-going prospective study about IEEE 802.11 Wireless Mesh Networks (WMNs), focusing on available techniques to support real-time communication. This paper addresses two possible approaches to meet real-time guarantees in WMNs that follow the IEEE 802.11s standard, respectively providing resource reservation for...

    Provided By University of Porto

  • White Papers // Jan 2011

    Open Standards and Open Source: Enabling Interoperability

    Interoperability is a major requirement for industries and governments in a society that increasingly moves towards global collaboration and integration. Open standards built on the principles of openness, transparency and consensus lay the grounds for innovation, growth and fair competition. Open standards are not synonymous of open source. The former...

    Provided By University of Porto

  • White Papers // Aug 2010

    Interaction And Negotiation Process In Business Service Relationships: Illustrative Cases

    This paper analyses business service relationships from the purchaser's point of view. The paper establishes a bridge between the type of business service and purchasing relationship or negotiation strategy. Studies have been developed to understand the interaction process between buyers and sellers, which is considered to be related to the...

    Provided By University of Porto

  • White Papers // Aug 2010

    Product-Service Combination In Manufacturing Firms: The Case Of Embraer

    This paper contributes to the discussion about the role of service in manufacturing firms. Market's complexity is forcing traditional product-manufacturing companies to change their position in the goods-services continuum by continuously extending the service business of their offers. Such authors as Lovelock and Gummesson, Vargo and Lusch and Gr?nross have...

    Provided By University of Porto

  • White Papers // Jun 2010

    On the Implementation of the Probabilistic Logic Programming Language ProbLog

    The past few years have seen a surge of interest in the field of probabilistic logic learning and statistical relational learning. In this endeavor, many probabilistic logics have been developed. ProbLog is a recent probabilistic extension of Prolog motivated by the mining of large biological networks. In ProbLog, facts can...

    Provided By University of Porto

  • White Papers // Jan 2010

    An Implementation of IP Over UMTS With QoS

    The IST ARROWS (Advanced Radio Resource Management for Wireless Services) project aims at providing Radio Resource Management (RRM) and Quality of Service (QoS) management solutions for the support of integrated services in the Universal Terrestrial Radio Access (UTRA). The project addresses packet access, asymmetrical traffic and multimedia services, all based...

    Provided By University of Porto

  • White Papers // Nov 2009

    The Immigration And Trade Link In The European Union Integration Process

    The aim of this paper is to analyse the link between immigration and trade among EU countries, particularly, in the context of the 2004 enlargement. The study tests whether the increase in immigrant stock from New Member States has any impact on the exports from the EU-15 to those markets...

    Provided By University of Porto

  • White Papers // Jul 2009

    Innovation, Collective Action And Network Positioning: A Case From The Automotive Industry

    Cooperation in industrial networks is a key issue within the conceptual framework developed by the IMP Group. Despite the existence of some studies, little attention has been paid to collective action phenomena, i.e., cooperative movements involving a significant number of actors. In this regard, the concept of issue-based net is...

    Provided By University of Porto

  • White Papers // Jun 2009

    Managing Interdependencies In Supplier Portfolios

    Building and managing a supplier base has been referred in the literature as a key issue of supplier management. Since the seminal work of Kraljic in 1983, scholars have proposed a number of models aimed at enhancing the effectiveness of supplier portfolio management. In the IMP arena, those models are...

    Provided By University of Porto

  • White Papers // Nov 2007

    A Partial Equilibrium View on Security and Privacy

    Up to date, research on the economics of security and privacy was performed on a micro level. This paper aims to introduce macroeconomic thinking in security and privacy, by adopting the well-established and powerful cross methodology for analyzing and studying security and privacy on an aggregate level. It should be...

    Provided By University of Porto

  • White Papers // Jan 2010

    An Implementation of IP Over UMTS With QoS

    The IST ARROWS (Advanced Radio Resource Management for Wireless Services) project aims at providing Radio Resource Management (RRM) and Quality of Service (QoS) management solutions for the support of integrated services in the Universal Terrestrial Radio Access (UTRA). The project addresses packet access, asymmetrical traffic and multimedia services, all based...

    Provided By University of Porto

  • White Papers // Jan 2011

    Open Standards and Open Source: Enabling Interoperability

    Interoperability is a major requirement for industries and governments in a society that increasingly moves towards global collaboration and integration. Open standards built on the principles of openness, transparency and consensus lay the grounds for innovation, growth and fair competition. Open standards are not synonymous of open source. The former...

    Provided By University of Porto

  • White Papers // Apr 2011

    The Effects Of Vertical Separation And Access Price Regulation On Investment Incentives

    The authors study the impact of vertical separation between an upstream firm and its subsidiary, which competes in the retail market with an independent firm, with the incentive to invest in network upgrade. This question is discussed under two alternative regimes concerning the price of the vital input sold by...

    Provided By University of Porto

  • White Papers // Nov 2009

    The Immigration And Trade Link In The European Union Integration Process

    The aim of this paper is to analyse the link between immigration and trade among EU countries, particularly, in the context of the 2004 enlargement. The study tests whether the increase in immigrant stock from New Member States has any impact on the exports from the EU-15 to those markets...

    Provided By University of Porto

  • White Papers // Aug 2010

    Interaction And Negotiation Process In Business Service Relationships: Illustrative Cases

    This paper analyses business service relationships from the purchaser's point of view. The paper establishes a bridge between the type of business service and purchasing relationship or negotiation strategy. Studies have been developed to understand the interaction process between buyers and sellers, which is considered to be related to the...

    Provided By University of Porto

  • White Papers // Aug 2010

    Product-Service Combination In Manufacturing Firms: The Case Of Embraer

    This paper contributes to the discussion about the role of service in manufacturing firms. Market's complexity is forcing traditional product-manufacturing companies to change their position in the goods-services continuum by continuously extending the service business of their offers. Such authors as Lovelock and Gummesson, Vargo and Lusch and Gr?nross have...

    Provided By University of Porto

  • White Papers // Jun 2009

    Managing Interdependencies In Supplier Portfolios

    Building and managing a supplier base has been referred in the literature as a key issue of supplier management. Since the seminal work of Kraljic in 1983, scholars have proposed a number of models aimed at enhancing the effectiveness of supplier portfolio management. In the IMP arena, those models are...

    Provided By University of Porto

  • White Papers // Jul 2009

    Innovation, Collective Action And Network Positioning: A Case From The Automotive Industry

    Cooperation in industrial networks is a key issue within the conceptual framework developed by the IMP Group. Despite the existence of some studies, little attention has been paid to collective action phenomena, i.e., cooperative movements involving a significant number of actors. In this regard, the concept of issue-based net is...

    Provided By University of Porto

  • White Papers // Jan 2012

    Reliability and Availability Evaluation of Wireless Sensor Networks for Industrial Applications

    Wireless Sensor Networks (WSN) currently represent the best candidate to be adopted as the communication solution for the last mile connection in process control and monitoring applications in industrial environments. Most of these applications have stringent dependability (reliability and availability) requirements, as a system failure may result in economic losses,...

    Provided By University of Porto

  • White Papers // Jan 2011

    Real-Time Communication in IEEE 802.11 Wireless Mesh Networks: A Prospective Study

    The purpose of this paper is to present an on-going prospective study about IEEE 802.11 Wireless Mesh Networks (WMNs), focusing on available techniques to support real-time communication. This paper addresses two possible approaches to meet real-time guarantees in WMNs that follow the IEEE 802.11s standard, respectively providing resource reservation for...

    Provided By University of Porto

  • White Papers // Mar 2012

    Trade-Off Between Cost and Goodput in Wireless

    The authors study the cost of improving the good-put, or the useful data rate, to user in a wireless network. They measure the cost in terms of number of base stations, which is highly correlated to the energy cost as well as capital and operational costs of a network provider....

    Provided By University of Porto

  • White Papers // Jun 2010

    On the Implementation of the Probabilistic Logic Programming Language ProbLog

    The past few years have seen a surge of interest in the field of probabilistic logic learning and statistical relational learning. In this endeavor, many probabilistic logics have been developed. ProbLog is a recent probabilistic extension of Prolog motivated by the mining of large biological networks. In ProbLog, facts can...

    Provided By University of Porto

  • White Papers // Jan 2013

    Efficient Time Synchronized One-Time Password Scheme to Provide Secure Wake-Up Authentication on Wireless Sensor Networks

    In this paper, the authors propose time synchronized one-time-password scheme to provide secure wake up authentication. The main constraint of Wireless Sensor Networks is their limited power resource that prevents users from using radio transmission over the network to transfer the passwords. On the other hand, computation power consumption is...

    Provided By University of Porto

  • White Papers // Aug 2011

    On the Efficient Implementation of a High Performance Multi-Agent Simulation System for Modeling Cellular Communications Involving a Novel Event Scheduling Algorithm

    Simulation models are used in the design, development and evaluation of wireless communication systems. While basic network entities as Base Stations and users are always taken into account in such simulation modeling, a critical but currently underestimated factor that affects the simulated network behavior is the corresponding simulation model which...

    Provided By University of Porto

  • White Papers // Nov 2007

    A Partial Equilibrium View on Security and Privacy

    Up to date, research on the economics of security and privacy was performed on a micro level. This paper aims to introduce macroeconomic thinking in security and privacy, by adopting the well-established and powerful cross methodology for analyzing and studying security and privacy on an aggregate level. It should be...

    Provided By University of Porto

  • White Papers // Jan 2012

    Decision Support Systems in Small Businesses

    Decision support systems are designed to assist managers to make more effective decisions. Potentially, they could provide great benefits to SME managers and enhance managers' decision-making capability. However, the extent of DSS implementation in small business is still low in general, although there is significant variation between different firms. The...

    Provided By University of Porto