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Detalles de la revista
Formato
Revista
eISSN
1407-6179
Publicado por primera vez
20 Mar 2000
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

Volumen 15 (2014): Edición 4 (December 2014)

Detalles de la revista
Formato
Revista
eISSN
1407-6179
Publicado por primera vez
20 Mar 2000
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

8 Artículos
Acceso abierto

Optimization of Decision-Making in Port Logistics Terminals: Using Analytic Hierarchy Process for the Case of Port of Thessaloniki

Publicado en línea: 19 Dec 2014
Páginas: 255 - 268

Resumen

Abstract

The management models pursued in logistics terminals determine their performance to a great extent. Terminals managed by public actors usually incorporate more social criteria into their decision-making processes. In addition, private management focuses on economic viability of the initiative. Decision-making is a complex process regardless the structure of management or the decision models useddue to the fact that a wide range of diverse criteria are embedded into this process. The objective of this paper it to determine a prioritization of a set of alternative options for investment projects which were suggested by port executives taking into account criteria and evaluation that have already validated by them. In order to perform the analysis a multi-criteria decision-making model was used: the Analytic Hierachy Process. The outcomes support a low-biased and efficient strategic planning through a balanced decision-making framework.

Key words:

  • ports
  • decision-making
  • AHP
  • logistics teminals
  • management structures
  • Thessaloniki
Acceso abierto

Road Traffic Measurement and Related Data Fusion Methodology for Traffic Estimation

Publicado en línea: 19 Dec 2014
Páginas: 269 - 279

Resumen

Abstract

The knowledge of road traffic parameters is of crucial importance to ensure state-of-the-art traffic services either in public or private transport. In our days, a plethora of road traffic data are continuously collected producing historical and real-time traffic information as well. The available information, however, arrive from inhomogeneous sensor systems. Therefore, a data fusion methodology is proposed based on Switching Kalman Filter. The concept enables efficient travel time estimation for urban road traffic network. On the other hand, the method may contribute to a better macroscopic traffic modelling.

Key words:

  • Road Traffic Estimation
  • Data fusion
  • Switching Kalman Filter
Acceso abierto

A Traveller Information System: Minimisation of the Number of Graphs’ Nodes Involved When Processing Route Requests

Publicado en línea: 19 Dec 2014
Páginas: 280 - 291

Resumen

Abstract

The number of people using public transport is continuously increasing. Transport companies want to fulfil travellers’ expectations wherever possible. However, the great number of public transport companies operating in the same area can sometimes confuse travellers as to which route they should take and how to obtain the information relative to their journey. In this paper we suggest integrating several traveller information systems from different companies into the same multimodal information system, offering companies the choice not to share their data. This encourages them to join the system. Additionally, we have minimised the number of nodes involved when processing travellers’ requests in order to simplify the calculation process. To put our plan into action, we have opted for a multi-agent system coupled with the Voronoi decomposition for managing the network.

Key words:

  • Information system
  • traveller information
  • multi-agent systems
  • Voronoi decomposition
Acceso abierto

Usage of Production Functions in the Comparative Analysis of Transport Related Fuel Consumption

Publicado en línea: 19 Dec 2014
Páginas: 292 - 298

Resumen

Abstract

This contribution aims to examine the relationship between the transport sector and the macroeconomy, particularly in fossil energy use, capital and labour relations. The authors have investigated the transport related fossil fuel consumption 2003 -2010 in a macroeconomic context in Hungary and Germany. The Cobb-Douglas type of production function could be justified empirically, while originating from the general CES (Constant Elasticity of Substitution) production function. Furthermore, as a policy implication, the results suggest that a solution for the for the reduction of anthropogenic CO2 driven by the combustion of fossil fuels presupposes technological innovation to reach emission reduction targets. Other measures, such as increasing the fossil fuel price by levying taxes, would consequently lead to an undesirable GDP decline.

Key words:

  • production function
  • environmental pollution
  • transport emission
  • fossil fuels
Acceso abierto

A Green Corridor Balanced Scorecard

Publicado en línea: 19 Dec 2014
Páginas: 299 - 307

Resumen

Abstract

Green transport corridors represent trans-shipment routes with a concentration of freight traffic between major hubs and long distances of transport marked by reduced environmental and climate impact. Important characteristics of green corridors are their network structures, their transnational character and their high involvement of public and private stakeholders, including political level requiring new governance models. Network-oriented controlling of green transport corridors require new concepts and instruments concentrating on multi-dimensional evaluation of collective strategies and processes in an international environment with a focus on cross-company aspects.

Until now the scientific discussion focusses on different sets of Key Performance Indicators (KPI) for monitoring and management of green corridors, which mainly cover sustainable aspects of green corridor development by neglecting a network-oriented controlling approach so that a general concept for green corridor controlling is still missing. The current KPI approaches emphasize the operational aspects of the corridor performance so that a strategic management control system is needed to safeguard an efficient, innovative, safe and environmental friendly long-term development.

The paper will present and discuss a management control system for green supply chains based on the balanced scorecard concept and link the ongoing scientific discussion to recent research results about green corridor management. The presented green corridor balanced scorecard tries to solve the strategic weakness of the existing green corridor controlling approaches by integrating cooperative and network-oriented concepts from supply chain management.

Key words:

  • Green Transport Corridors
  • Management Control Systems
  • Networks
  • Balanced Scorecard
  • Key Performance Indicators
Acceso abierto

Dipole Approximation in the Calculation of the Perturbed Velocities

Publicado en línea: 19 Dec 2014
Páginas: 308 - 314

Resumen

Abstract

In this article we consider one of the approaches aimed at reducing time of calculation of aerodynamic characteristics of the studied objects using discrete vortex method. Also, accuracy assessment of calculation of aerodynamic characteristics was performed.

Analysis of the obtained dependences allows us to make a conclusion that the considered approach to the calculation of the functions of the mutual influence on the stages of formation of the system of linear algebraic equations, position of vortex sheet nodes as well as aerodynamic loads reduces hardware costs about three times, with a relative error of less than 4%.

Key words:

  • discrete vortex method
  • dipole approximation
Acceso abierto

Use of a Phase Transition Concept for Traffic Flow Condition Estimation

Publicado en línea: 19 Dec 2014
Páginas: 315 - 321

Resumen

Abstract

The article covers the main models of traffic flow conditions, analyzes the condition estimation criteria, and provides the classification of models. The article provides the grounds for the use of the phase transition concept for traffic flow condition estimation. The models of the aggregate condition of free and congested traffic have been developed, the phase boundaries between free and congested traffic have been defined. Applicability conditions for the models of the aggregate condition of have been analyzed.

Key words:

  • traffic flow
  • classification condition
  • phase transitions
Acceso abierto

Oil Pollution in the Southeastern Baltic Sea in 2009-2011

Publicado en línea: 19 Dec 2014
Páginas: 322 - 331

Resumen

Abstract

From January 2009 to April 2012 a satellite survey of the central and southeastern parts of the Baltic Sea was carried out by the Space Radar Laboratory at the Space Research Institute of Russian Academy of Sciences (RAS). The main attention was focused on the detection of oil pollution as well as biogenic and anthropogenic surfactant films. The basic data are high resolution radar images obtained by advanced synthetic aperture radar (ASAR) on board of the Envisat satellite of the European Space Agency. Remotely sensed data in visual and infrared (IR) bands acquired by sensors MERIS Envisat, MODIS-Terra and -Aqua, and AVHRR NOAA nearly simultaneously with the ASAR images, were processed and analysed in order to facilitate the discrimination between different types of surface pollutants, to understand a comprehensive features of meteorological and hydrodynamic processes in the sea area of investigation, and to reveal factors determining pollutants spread and drift. The regions of the most intense oil pollution are outlined.

Key words:

  • Southeastern Baltic Sea
  • oil pollution
  • satellite monitoring
  • synthetic aperture radar
  • Envisat
  • MODIS-Terra and Aqua
8 Artículos
Acceso abierto

Optimization of Decision-Making in Port Logistics Terminals: Using Analytic Hierarchy Process for the Case of Port of Thessaloniki

Publicado en línea: 19 Dec 2014
Páginas: 255 - 268

Resumen

Abstract

The management models pursued in logistics terminals determine their performance to a great extent. Terminals managed by public actors usually incorporate more social criteria into their decision-making processes. In addition, private management focuses on economic viability of the initiative. Decision-making is a complex process regardless the structure of management or the decision models useddue to the fact that a wide range of diverse criteria are embedded into this process. The objective of this paper it to determine a prioritization of a set of alternative options for investment projects which were suggested by port executives taking into account criteria and evaluation that have already validated by them. In order to perform the analysis a multi-criteria decision-making model was used: the Analytic Hierachy Process. The outcomes support a low-biased and efficient strategic planning through a balanced decision-making framework.

Key words:

  • ports
  • decision-making
  • AHP
  • logistics teminals
  • management structures
  • Thessaloniki
Acceso abierto

Road Traffic Measurement and Related Data Fusion Methodology for Traffic Estimation

Publicado en línea: 19 Dec 2014
Páginas: 269 - 279

Resumen

Abstract

The knowledge of road traffic parameters is of crucial importance to ensure state-of-the-art traffic services either in public or private transport. In our days, a plethora of road traffic data are continuously collected producing historical and real-time traffic information as well. The available information, however, arrive from inhomogeneous sensor systems. Therefore, a data fusion methodology is proposed based on Switching Kalman Filter. The concept enables efficient travel time estimation for urban road traffic network. On the other hand, the method may contribute to a better macroscopic traffic modelling.

Key words:

  • Road Traffic Estimation
  • Data fusion
  • Switching Kalman Filter
Acceso abierto

A Traveller Information System: Minimisation of the Number of Graphs’ Nodes Involved When Processing Route Requests

Publicado en línea: 19 Dec 2014
Páginas: 280 - 291

Resumen

Abstract

The number of people using public transport is continuously increasing. Transport companies want to fulfil travellers’ expectations wherever possible. However, the great number of public transport companies operating in the same area can sometimes confuse travellers as to which route they should take and how to obtain the information relative to their journey. In this paper we suggest integrating several traveller information systems from different companies into the same multimodal information system, offering companies the choice not to share their data. This encourages them to join the system. Additionally, we have minimised the number of nodes involved when processing travellers’ requests in order to simplify the calculation process. To put our plan into action, we have opted for a multi-agent system coupled with the Voronoi decomposition for managing the network.

Key words:

  • Information system
  • traveller information
  • multi-agent systems
  • Voronoi decomposition
Acceso abierto

Usage of Production Functions in the Comparative Analysis of Transport Related Fuel Consumption

Publicado en línea: 19 Dec 2014
Páginas: 292 - 298

Resumen

Abstract

This contribution aims to examine the relationship between the transport sector and the macroeconomy, particularly in fossil energy use, capital and labour relations. The authors have investigated the transport related fossil fuel consumption 2003 -2010 in a macroeconomic context in Hungary and Germany. The Cobb-Douglas type of production function could be justified empirically, while originating from the general CES (Constant Elasticity of Substitution) production function. Furthermore, as a policy implication, the results suggest that a solution for the for the reduction of anthropogenic CO2 driven by the combustion of fossil fuels presupposes technological innovation to reach emission reduction targets. Other measures, such as increasing the fossil fuel price by levying taxes, would consequently lead to an undesirable GDP decline.

Key words:

  • production function
  • environmental pollution
  • transport emission
  • fossil fuels
Acceso abierto

A Green Corridor Balanced Scorecard

Publicado en línea: 19 Dec 2014
Páginas: 299 - 307

Resumen

Abstract

Green transport corridors represent trans-shipment routes with a concentration of freight traffic between major hubs and long distances of transport marked by reduced environmental and climate impact. Important characteristics of green corridors are their network structures, their transnational character and their high involvement of public and private stakeholders, including political level requiring new governance models. Network-oriented controlling of green transport corridors require new concepts and instruments concentrating on multi-dimensional evaluation of collective strategies and processes in an international environment with a focus on cross-company aspects.

Until now the scientific discussion focusses on different sets of Key Performance Indicators (KPI) for monitoring and management of green corridors, which mainly cover sustainable aspects of green corridor development by neglecting a network-oriented controlling approach so that a general concept for green corridor controlling is still missing. The current KPI approaches emphasize the operational aspects of the corridor performance so that a strategic management control system is needed to safeguard an efficient, innovative, safe and environmental friendly long-term development.

The paper will present and discuss a management control system for green supply chains based on the balanced scorecard concept and link the ongoing scientific discussion to recent research results about green corridor management. The presented green corridor balanced scorecard tries to solve the strategic weakness of the existing green corridor controlling approaches by integrating cooperative and network-oriented concepts from supply chain management.

Key words:

  • Green Transport Corridors
  • Management Control Systems
  • Networks
  • Balanced Scorecard
  • Key Performance Indicators
Acceso abierto

Dipole Approximation in the Calculation of the Perturbed Velocities

Publicado en línea: 19 Dec 2014
Páginas: 308 - 314

Resumen

Abstract

In this article we consider one of the approaches aimed at reducing time of calculation of aerodynamic characteristics of the studied objects using discrete vortex method. Also, accuracy assessment of calculation of aerodynamic characteristics was performed.

Analysis of the obtained dependences allows us to make a conclusion that the considered approach to the calculation of the functions of the mutual influence on the stages of formation of the system of linear algebraic equations, position of vortex sheet nodes as well as aerodynamic loads reduces hardware costs about three times, with a relative error of less than 4%.

Key words:

  • discrete vortex method
  • dipole approximation
Acceso abierto

Use of a Phase Transition Concept for Traffic Flow Condition Estimation

Publicado en línea: 19 Dec 2014
Páginas: 315 - 321

Resumen

Abstract

The article covers the main models of traffic flow conditions, analyzes the condition estimation criteria, and provides the classification of models. The article provides the grounds for the use of the phase transition concept for traffic flow condition estimation. The models of the aggregate condition of free and congested traffic have been developed, the phase boundaries between free and congested traffic have been defined. Applicability conditions for the models of the aggregate condition of have been analyzed.

Key words:

  • traffic flow
  • classification condition
  • phase transitions
Acceso abierto

Oil Pollution in the Southeastern Baltic Sea in 2009-2011

Publicado en línea: 19 Dec 2014
Páginas: 322 - 331

Resumen

Abstract

From January 2009 to April 2012 a satellite survey of the central and southeastern parts of the Baltic Sea was carried out by the Space Radar Laboratory at the Space Research Institute of Russian Academy of Sciences (RAS). The main attention was focused on the detection of oil pollution as well as biogenic and anthropogenic surfactant films. The basic data are high resolution radar images obtained by advanced synthetic aperture radar (ASAR) on board of the Envisat satellite of the European Space Agency. Remotely sensed data in visual and infrared (IR) bands acquired by sensors MERIS Envisat, MODIS-Terra and -Aqua, and AVHRR NOAA nearly simultaneously with the ASAR images, were processed and analysed in order to facilitate the discrimination between different types of surface pollutants, to understand a comprehensive features of meteorological and hydrodynamic processes in the sea area of investigation, and to reveal factors determining pollutants spread and drift. The regions of the most intense oil pollution are outlined.

Key words:

  • Southeastern Baltic Sea
  • oil pollution
  • satellite monitoring
  • synthetic aperture radar
  • Envisat
  • MODIS-Terra and Aqua

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