University of Cagliari

Displaying 1-14 of 14 results

  • White Papers // Sep 2012

    Service Contract Clauses as Business Rules

    Service contracts between digital providers and consumers should be: understood and verified by the business stakeholders, mechanically checked for consistency and automatically mapped to system implementations. This paper presents guidelines and templates for expressing service contract clauses as business rules, i.e. logical formulations in constrained natural language conforming to the...

    Provided By University of Cagliari

  • White Papers // May 2012

    SDWM: An Enhanced Spatial Data Warehouse Metamodel

    Some research has been done in order to define metamodels for Spatial Data Warehouses (SDW) modeling. However, the authors observe that most of these works propose metamodels that mix concepts of DW modeling (i.e. dimensions and their descriptive attributes) with concepts of OLAP modeling (i.e. hierarchies and their levels). They...

    Provided By University of Cagliari

  • White Papers // May 2012

    Underwater Acoustic Communications: A New Channel Modeling

    In these last years, many studies have focalized on the design of reliable under water acoustic communication systems. However, the ocean acoustic communication channel exhibits strong amplitude and phase fluctuations and the phenomena of diffraction, refraction and reflection. Due to the complexity of environment, the motions of transducers, sea surface,...

    Provided By University of Cagliari

  • White Papers // Oct 2011

    Consistent Query Answering Via ASP From Different Perspectives: Theory and Practice

    A data integration system provides transparent access to different data sources by suitably combining their data, and providing the user with a unified view of them, called global schema. However, source data are generally not under the control of the data integration process, thus integrated data may violate global integrity...

    Provided By University of Cagliari

  • White Papers // Sep 2011

    Cooperative Mechanisms to Carry and Forward Packets in a DTN VANET

    The aim of this paper is to find the best strategies to carry and forward packets within VANETs that follow a Delay Tolerant Network. In this environment nodes are affected by intermittent connectivity and topology constantly changes. When no route is available and the link failure percentage is high, the...

    Provided By University of Cagliari

  • White Papers // Jul 2010

    Is Agglomeration Really Good For Growth? Global Efficiency, Interregional Equity And Uneven Growth

    According to the New Economic Geography and Growth (NEGG) literature (Baldwin et al. (2004)), spatial concentration of industrial activities increases growth at the regional and aggregate level without generating regional growth differentials. This view is not supported by the data. The authors extend the canonical model with an additional sector...

    Provided By University of Cagliari

  • White Papers // Jun 2010

    Competition And The Signaling Role Of Prices

    In a market where sellers are heterogeneous with respect of the quality of their good and are more informed than buyers, high quality sellers' chances to trade might depend on their ability to inform buyers about the quality of the goods they offer. The authors study how the strength of...

    Provided By University of Cagliari

  • White Papers // Apr 2010

    Credit Within The Firm

    The authors exploit time variation in the degree of development of local credit markets and matched employer-employee data to assess the role of the firm as an internal credit market. In less developed local credit markets firms can offer a flatter wage-tenure profile than firms in more developed credit markets...

    Provided By University of Cagliari

  • White Papers // Apr 2010

    Relationship Finance, Market Finance And Endogenous Business Cycles

    This paper develops an overlapping generation model with asymmetric information in the credit market such that the interplay between relationship finance supplied by investors who monitor investment decisions ex-ante and market finance supplied by investors who rely on public information can be the source of endogenous business fluctuations. Monitoring helps...

    Provided By University of Cagliari

  • White Papers // Jun 2009

    Empirical Study of Software Quality Evolution in Open Source Projects Using Agile Practices

    The authors analyse the time evolution of two open source Java projects: Eclipse and Netbeans, both developed following agile practices, though to a different extent. The study is centered on quality analysis of the systems, measured as defects absence, and its relation with software metrics evolution. The two projects are...

    Provided By University of Cagliari

  • White Papers // May 2009

    An Analysis of Bug Distribution in Object Oriented Systems

    The authors introduced a new approach to describe Java software as graph, where nodes represent a Java file called Compilation Unit (CU) and an edges represent a relations between them. The software system is characterized by the degree distribution of the graph properties, like in-or-out links, as well as by...

    Provided By University of Cagliari

  • White Papers // Apr 2009

    Local Financial Development and SMEs Capital Structure. an Empirical Investigation

    In this paper, the authors investigate the role of institutional differences at the local level as determinants of firms' capital structure. Specifically, the aim is to empirically assess whether and to what extent SMEs' financial decisions are affected by local financial development - evaluating this influence both ceteris paribus, and...

    Provided By University of Cagliari

  • White Papers // Jan 2009

    Pollution Adverse Tourists And Growth

    The authors build a growth model in which tourism development generates pollution while tourists are pollution adverse. They establish that long run positive growth exists only for a particular value of tourists pollution adversion. Furthermore, they show that an intensive use of facilities is associated with a lower growth rate...

    Provided By University of Cagliari

  • White Papers // Jan 2009

    Does Deflation Method Matter For Productivity Measures?

    In this paper, the authors disagree on the opportunity to use the double deflation method to produce an equilibrating system of account at a constant price. In fact, by relaxing such a condition, by means of the single deflation method, the authors obtain a measure of purchasing power transfer that...

    Provided By University of Cagliari

  • White Papers // Apr 2009

    Local Financial Development and SMEs Capital Structure. an Empirical Investigation

    In this paper, the authors investigate the role of institutional differences at the local level as determinants of firms' capital structure. Specifically, the aim is to empirically assess whether and to what extent SMEs' financial decisions are affected by local financial development - evaluating this influence both ceteris paribus, and...

    Provided By University of Cagliari

  • White Papers // Sep 2012

    Service Contract Clauses as Business Rules

    Service contracts between digital providers and consumers should be: understood and verified by the business stakeholders, mechanically checked for consistency and automatically mapped to system implementations. This paper presents guidelines and templates for expressing service contract clauses as business rules, i.e. logical formulations in constrained natural language conforming to the...

    Provided By University of Cagliari

  • White Papers // May 2012

    SDWM: An Enhanced Spatial Data Warehouse Metamodel

    Some research has been done in order to define metamodels for Spatial Data Warehouses (SDW) modeling. However, the authors observe that most of these works propose metamodels that mix concepts of DW modeling (i.e. dimensions and their descriptive attributes) with concepts of OLAP modeling (i.e. hierarchies and their levels). They...

    Provided By University of Cagliari

  • White Papers // Jun 2010

    Competition And The Signaling Role Of Prices

    In a market where sellers are heterogeneous with respect of the quality of their good and are more informed than buyers, high quality sellers' chances to trade might depend on their ability to inform buyers about the quality of the goods they offer. The authors study how the strength of...

    Provided By University of Cagliari

  • White Papers // Apr 2010

    Credit Within The Firm

    The authors exploit time variation in the degree of development of local credit markets and matched employer-employee data to assess the role of the firm as an internal credit market. In less developed local credit markets firms can offer a flatter wage-tenure profile than firms in more developed credit markets...

    Provided By University of Cagliari

  • White Papers // Apr 2010

    Relationship Finance, Market Finance And Endogenous Business Cycles

    This paper develops an overlapping generation model with asymmetric information in the credit market such that the interplay between relationship finance supplied by investors who monitor investment decisions ex-ante and market finance supplied by investors who rely on public information can be the source of endogenous business fluctuations. Monitoring helps...

    Provided By University of Cagliari

  • White Papers // Jan 2009

    Does Deflation Method Matter For Productivity Measures?

    In this paper, the authors disagree on the opportunity to use the double deflation method to produce an equilibrating system of account at a constant price. In fact, by relaxing such a condition, by means of the single deflation method, the authors obtain a measure of purchasing power transfer that...

    Provided By University of Cagliari

  • White Papers // Jun 2009

    Empirical Study of Software Quality Evolution in Open Source Projects Using Agile Practices

    The authors analyse the time evolution of two open source Java projects: Eclipse and Netbeans, both developed following agile practices, though to a different extent. The study is centered on quality analysis of the systems, measured as defects absence, and its relation with software metrics evolution. The two projects are...

    Provided By University of Cagliari

  • White Papers // May 2009

    An Analysis of Bug Distribution in Object Oriented Systems

    The authors introduced a new approach to describe Java software as graph, where nodes represent a Java file called Compilation Unit (CU) and an edges represent a relations between them. The software system is characterized by the degree distribution of the graph properties, like in-or-out links, as well as by...

    Provided By University of Cagliari

  • White Papers // Jan 2009

    Pollution Adverse Tourists And Growth

    The authors build a growth model in which tourism development generates pollution while tourists are pollution adverse. They establish that long run positive growth exists only for a particular value of tourists pollution adversion. Furthermore, they show that an intensive use of facilities is associated with a lower growth rate...

    Provided By University of Cagliari

  • White Papers // Jul 2010

    Is Agglomeration Really Good For Growth? Global Efficiency, Interregional Equity And Uneven Growth

    According to the New Economic Geography and Growth (NEGG) literature (Baldwin et al. (2004)), spatial concentration of industrial activities increases growth at the regional and aggregate level without generating regional growth differentials. This view is not supported by the data. The authors extend the canonical model with an additional sector...

    Provided By University of Cagliari

  • White Papers // Sep 2011

    Cooperative Mechanisms to Carry and Forward Packets in a DTN VANET

    The aim of this paper is to find the best strategies to carry and forward packets within VANETs that follow a Delay Tolerant Network. In this environment nodes are affected by intermittent connectivity and topology constantly changes. When no route is available and the link failure percentage is high, the...

    Provided By University of Cagliari

  • White Papers // May 2012

    Underwater Acoustic Communications: A New Channel Modeling

    In these last years, many studies have focalized on the design of reliable under water acoustic communication systems. However, the ocean acoustic communication channel exhibits strong amplitude and phase fluctuations and the phenomena of diffraction, refraction and reflection. Due to the complexity of environment, the motions of transducers, sea surface,...

    Provided By University of Cagliari

  • White Papers // Oct 2011

    Consistent Query Answering Via ASP From Different Perspectives: Theory and Practice

    A data integration system provides transparent access to different data sources by suitably combining their data, and providing the user with a unified view of them, called global schema. However, source data are generally not under the control of the data integration process, thus integrated data may violate global integrity...

    Provided By University of Cagliari