University of Macedonia

Displaying 1-19 of 19 results

  • White Papers // Mar 2012

    Comparison of Routing Protocols for Underwater Sensor Networks: A Survey

    Sensor networks in underwater environments face unique adverse conditions. In order to be functional, specialized routing protocols are required to route the data from source to destination. This paper surveys routing protocols for underwater sensor networks. The routing protocols are examined and compared with respect to the network conditions and...

    Provided By University of Macedonia

  • White Papers // Mar 2012

    An Experimental Survey and Comparison of Proof by Knowledge Authentication Techniques

    Proof by knowledge authentication techniques include traditional text passwords, visual passwords and graphical passwords. The paper compares these three techniques using an experiment. A total of 100 users participated in the experiment. After getting informed about the new authentication methods, users created their own text, visual and graphical passwords. Then...

    Provided By University of Macedonia

  • White Papers // Sep 2011

    Exploiting Multimedia Frame Semantics and MAC-Layer Enhancements for QoS Provisioning in IEEE 802.11e Congested Networks

    Wireless Local Area Networks (WLANs) supporting modern streaming multimedia applications constitute a very challenging and rapidly changing field of research. Towards implementing effective multimedia wireless networks, the IEEE has published the "State of the art" IEEE 802.11e standard, which introduced a QoS-aware MAC-layer along with a series of efficiency enhancements....

    Provided By University of Macedonia

  • White Papers // Apr 2011

    Inflation And Inflation Uncertainty: Evidence From Two Transition Economies

    This paper examines the causal link between inflation and inflation uncertainty for the transition economies of Russia and Ukraine. The Iterated Cumulative Sums of Squares Exponential Generalized Autoregressive Conditional Heteroskedasticity (ICSS-EGARCH- M-t) models that allow for asymmetry and regime shifts in the variance of inflation are employed to establish the...

    Provided By University of Macedonia

  • White Papers // Dec 2010

    US Inflation And Inflation Uncertainty In A Historical Perspective: The Impact Of Recessions

    The authors use over two hundred years of US inflation data to examine the impact of inflation uncertainty on inflation. An analysis of the full period without allowing for various regimes shows no impact of uncertainty on inflation. However, once they distinguish between recessions and non recessions, they find that...

    Provided By University of Macedonia

  • White Papers // Sep 2010

    Uncertainty In The Public Debt Market And Stochastic Lon-Run Growth

    In a continuous time model, a representative household has to allocate its investment and consumption in an optimal manner under conditions of uncertainty. In the present paper it is hypothesized that there are two types of assets: a risk-free and a risky asset. The risk-free asset is assumed to be...

    Provided By University of Macedonia

  • White Papers // Sep 2010

    Inflation, Inflation Uncertainty And Growth: Are They Related?

    The authors examine the relationship between inflation uncertainty, inflation and growth using annual historical data on industrial countries covering in many cases more than one century. Proxying inflation uncertainty by the conditional variance of inflation shocks, they obtain the following results. There is significant evidence for the positive effect of...

    Provided By University of Macedonia

  • White Papers // Jul 2010

    Comparing the Proof by Knowledge Authentication Techniques

    This paper presents a survey of proof by knowledge authentication techniques (Text passwords, visual passwords and graphical passwords). Both new methods are more memorable, as people have to remember images and not characters and graphical passwords are also more secure. A total of 100 users participated in survey, who after...

    Provided By University of Macedonia

  • White Papers // Sep 2009

    Game-Based Learning Using MANETs

    Game-based learning has been widely adopted for children's learning. By playing games, children may develop fantasy, curiosity, challenge and control. Moreover, game-based learning has been adopted by several universities and lifelong learning projects. Introducing game-based learning at outdoor educational activities would benefit learning. Mobile Ad Hoc NETworks (MANETs) would be...

    Provided By University of Macedonia

  • White Papers // Aug 2009

    Modelling and Forecasting Mobile Telecommunication Services: The Case of Greece

    In this paper, the authors try to model the adoption pattern of mobile telecommunication services into the Greek market for the period from 1993 to 2005. Two separate sigmoid curves, the Gompertz and the Logistic, are fitted to the observed number of subscribers by means of non-linear least squares. The...

    Provided By University of Macedonia

  • White Papers // Jun 2009

    Evaluation of Multicasting Algorithms in Manets

    Disaster relief, education, and military are common situations where mobile nodes need to communicate in areas without any preexisting infrastructure. In these situations, MANETs (Mobile Ad-Hoc Networks) are used. When these nodes need one-to-many or many-to-many communication then multicasting is employed. Two of the best multicast protocols, MAODV (Multicast Ad-hoc...

    Provided By University of Macedonia

  • White Papers // Mar 2009

    Pricing, Investments And Mergers With Intertemporal Capacity Constraints

    The authors set up a duopoly model with dynamic capacity constraints under demand uncertainty. They endogenize the investment decisions of the firms, examine their intertemporal pricing behavior, their incentives to merge, as well as the welfare implications of a merger. Whereas under known and constant demand the high capacity firm...

    Provided By University of Macedonia

  • White Papers // Feb 2009

    What Is The Impact Of Currency Unions On FDI Flows? Evidence From Eurozone Countries

    This paper investigates the effect of EMU on inward FDI flows to euro zone using panel data from 22 OECD countries for the period 1973-2006. The empirical findings suggest that the EMU led to a statistically significant overall increase in inward FDI flows to countries that adopted the euro as...

    Provided By University of Macedonia

  • White Papers // Jan 2009

    Modelling Stock Returns In Africa~s Emerging Equity Markets

    The authors investigate the behaviour of stock returns in Africa's largest markets namely, Egypt, Kenya, Morocco, Nigeria, South Africa, Tunisia and Zimbabwe. The validity of the random walk hypothesis is examined and rejected by employing a battery of tests. Secondly they employ smooth transition and conditional volatility models to uncover...

    Provided By University of Macedonia

  • White Papers // Dec 2008

    Measuring The Impact Of HRM On Organisational Performance

    The purpose of this paper is to measure the impact of HRM on organisational performance in the context of Greece. Data were collected from 178 organisations using a questionnaire survey in the Greek manufacturing sector, and analysed using the 'Structural equation modelling' methodology. The results indicated that the relationship between...

    Provided By University of Macedonia

  • White Papers // Nov 2008

    Are Economic Growth And The Variability Of The Business Cycle Related ? Evidence From Five European Countries

    The authors use a long series of annual data that span over 100 years to examine the relationship between output growth and its uncertainty in five European countries. Using the GARCH methodology to proxy uncertainty, they obtain two important results. First, more uncertainty about output leads to a higher rate...

    Provided By University of Macedonia

  • White Papers // Oct 2008

    Admission Control for VoIP and Data Traffic in IEEE 802.11 WLANs

    This paper presents an novel analytical model for calculation of throughput of the IEEE 802.11 Distributed Coordination Function (DCF) under variable packet length assuming ideal channel conditions. The proposed model considers basic access scheme but can be easily applied to RTS/CTS reservation scheme. Moreover, the authors use this model to...

    Provided By University of Macedonia

  • White Papers // Oct 2008

    Quality And Effectiveness of Enterprise Resource Planning - Customer Relationship Management Systems

    Customer Relationship Management (CRM) systems are defined as an all - embracing approach, which seamlessly integrates sales, customer service, marketing, field support and other functions that touch customers. Most times CRM systems are considered modules of ERP systems. A possible solution would be for the ERP support enterprises to use...

    Provided By University of Macedonia

  • White Papers // Dec 2006

    Computing Coupling for Business Process Models

    Business process management and process models are rapidly gaining a worldwide acceptance and recognition. Recently, a new area of research has emerged, the measurement of quality metrics of process models. The authors believe that current modeling tools should provide more analytical capabilities, namely they should provide mechanisms to analyze the...

    Provided By University of Macedonia

  • White Papers // Sep 2010

    Uncertainty In The Public Debt Market And Stochastic Lon-Run Growth

    In a continuous time model, a representative household has to allocate its investment and consumption in an optimal manner under conditions of uncertainty. In the present paper it is hypothesized that there are two types of assets: a risk-free and a risky asset. The risk-free asset is assumed to be...

    Provided By University of Macedonia

  • White Papers // Feb 2009

    What Is The Impact Of Currency Unions On FDI Flows? Evidence From Eurozone Countries

    This paper investigates the effect of EMU on inward FDI flows to euro zone using panel data from 22 OECD countries for the period 1973-2006. The empirical findings suggest that the EMU led to a statistically significant overall increase in inward FDI flows to countries that adopted the euro as...

    Provided By University of Macedonia

  • White Papers // Mar 2009

    Pricing, Investments And Mergers With Intertemporal Capacity Constraints

    The authors set up a duopoly model with dynamic capacity constraints under demand uncertainty. They endogenize the investment decisions of the firms, examine their intertemporal pricing behavior, their incentives to merge, as well as the welfare implications of a merger. Whereas under known and constant demand the high capacity firm...

    Provided By University of Macedonia

  • White Papers // Jan 2009

    Modelling Stock Returns In Africa~s Emerging Equity Markets

    The authors investigate the behaviour of stock returns in Africa's largest markets namely, Egypt, Kenya, Morocco, Nigeria, South Africa, Tunisia and Zimbabwe. The validity of the random walk hypothesis is examined and rejected by employing a battery of tests. Secondly they employ smooth transition and conditional volatility models to uncover...

    Provided By University of Macedonia

  • White Papers // Apr 2011

    Inflation And Inflation Uncertainty: Evidence From Two Transition Economies

    This paper examines the causal link between inflation and inflation uncertainty for the transition economies of Russia and Ukraine. The Iterated Cumulative Sums of Squares Exponential Generalized Autoregressive Conditional Heteroskedasticity (ICSS-EGARCH- M-t) models that allow for asymmetry and regime shifts in the variance of inflation are employed to establish the...

    Provided By University of Macedonia

  • White Papers // Nov 2008

    Are Economic Growth And The Variability Of The Business Cycle Related ? Evidence From Five European Countries

    The authors use a long series of annual data that span over 100 years to examine the relationship between output growth and its uncertainty in five European countries. Using the GARCH methodology to proxy uncertainty, they obtain two important results. First, more uncertainty about output leads to a higher rate...

    Provided By University of Macedonia

  • White Papers // Sep 2011

    Exploiting Multimedia Frame Semantics and MAC-Layer Enhancements for QoS Provisioning in IEEE 802.11e Congested Networks

    Wireless Local Area Networks (WLANs) supporting modern streaming multimedia applications constitute a very challenging and rapidly changing field of research. Towards implementing effective multimedia wireless networks, the IEEE has published the "State of the art" IEEE 802.11e standard, which introduced a QoS-aware MAC-layer along with a series of efficiency enhancements....

    Provided By University of Macedonia

  • White Papers // Aug 2009

    Modelling and Forecasting Mobile Telecommunication Services: The Case of Greece

    In this paper, the authors try to model the adoption pattern of mobile telecommunication services into the Greek market for the period from 1993 to 2005. Two separate sigmoid curves, the Gompertz and the Logistic, are fitted to the observed number of subscribers by means of non-linear least squares. The...

    Provided By University of Macedonia

  • White Papers // Oct 2008

    Admission Control for VoIP and Data Traffic in IEEE 802.11 WLANs

    This paper presents an novel analytical model for calculation of throughput of the IEEE 802.11 Distributed Coordination Function (DCF) under variable packet length assuming ideal channel conditions. The proposed model considers basic access scheme but can be easily applied to RTS/CTS reservation scheme. Moreover, the authors use this model to...

    Provided By University of Macedonia

  • White Papers // Mar 2012

    Comparison of Routing Protocols for Underwater Sensor Networks: A Survey

    Sensor networks in underwater environments face unique adverse conditions. In order to be functional, specialized routing protocols are required to route the data from source to destination. This paper surveys routing protocols for underwater sensor networks. The routing protocols are examined and compared with respect to the network conditions and...

    Provided By University of Macedonia

  • White Papers // Mar 2012

    An Experimental Survey and Comparison of Proof by Knowledge Authentication Techniques

    Proof by knowledge authentication techniques include traditional text passwords, visual passwords and graphical passwords. The paper compares these three techniques using an experiment. A total of 100 users participated in the experiment. After getting informed about the new authentication methods, users created their own text, visual and graphical passwords. Then...

    Provided By University of Macedonia

  • White Papers // Sep 2009

    Game-Based Learning Using MANETs

    Game-based learning has been widely adopted for children's learning. By playing games, children may develop fantasy, curiosity, challenge and control. Moreover, game-based learning has been adopted by several universities and lifelong learning projects. Introducing game-based learning at outdoor educational activities would benefit learning. Mobile Ad Hoc NETworks (MANETs) would be...

    Provided By University of Macedonia

  • White Papers // Dec 2006

    Computing Coupling for Business Process Models

    Business process management and process models are rapidly gaining a worldwide acceptance and recognition. Recently, a new area of research has emerged, the measurement of quality metrics of process models. The authors believe that current modeling tools should provide more analytical capabilities, namely they should provide mechanisms to analyze the...

    Provided By University of Macedonia

  • White Papers // Oct 2008

    Quality And Effectiveness of Enterprise Resource Planning - Customer Relationship Management Systems

    Customer Relationship Management (CRM) systems are defined as an all - embracing approach, which seamlessly integrates sales, customer service, marketing, field support and other functions that touch customers. Most times CRM systems are considered modules of ERP systems. A possible solution would be for the ERP support enterprises to use...

    Provided By University of Macedonia

  • White Papers // Dec 2008

    Measuring The Impact Of HRM On Organisational Performance

    The purpose of this paper is to measure the impact of HRM on organisational performance in the context of Greece. Data were collected from 178 organisations using a questionnaire survey in the Greek manufacturing sector, and analysed using the 'Structural equation modelling' methodology. The results indicated that the relationship between...

    Provided By University of Macedonia

  • White Papers // Jun 2009

    Evaluation of Multicasting Algorithms in Manets

    Disaster relief, education, and military are common situations where mobile nodes need to communicate in areas without any preexisting infrastructure. In these situations, MANETs (Mobile Ad-Hoc Networks) are used. When these nodes need one-to-many or many-to-many communication then multicasting is employed. Two of the best multicast protocols, MAODV (Multicast Ad-hoc...

    Provided By University of Macedonia

  • White Papers // Jul 2010

    Comparing the Proof by Knowledge Authentication Techniques

    This paper presents a survey of proof by knowledge authentication techniques (Text passwords, visual passwords and graphical passwords). Both new methods are more memorable, as people have to remember images and not characters and graphical passwords are also more secure. A total of 100 users participated in survey, who after...

    Provided By University of Macedonia

  • White Papers // Dec 2010

    US Inflation And Inflation Uncertainty In A Historical Perspective: The Impact Of Recessions

    The authors use over two hundred years of US inflation data to examine the impact of inflation uncertainty on inflation. An analysis of the full period without allowing for various regimes shows no impact of uncertainty on inflation. However, once they distinguish between recessions and non recessions, they find that...

    Provided By University of Macedonia

  • White Papers // Sep 2010

    Inflation, Inflation Uncertainty And Growth: Are They Related?

    The authors examine the relationship between inflation uncertainty, inflation and growth using annual historical data on industrial countries covering in many cases more than one century. Proxying inflation uncertainty by the conditional variance of inflation shocks, they obtain the following results. There is significant evidence for the positive effect of...

    Provided By University of Macedonia