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Volume 14 (2013): Issue 4 (December 2013)

Volume 14 (2013): Issue 3 (September 2013)

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Journal Details
Format
Journal
eISSN
1407-6179
ISSN
1407-6160
First Published
20 Mar 2000
Publication timeframe
4 times per year
Languages
English

Search

Volume 14 (2013): Issue 3 (September 2013)

Journal Details
Format
Journal
eISSN
1407-6179
ISSN
1407-6160
First Published
20 Mar 2000
Publication timeframe
4 times per year
Languages
English

Search

7 Articles
Open Access

Traffic Management Facilities Used at Intersection of Ukmergės and Geležinio Vilko Streets in Vilnius

Published Online: 21 Jun 2013
Page range: 187 - 195

Abstract

Vilnius, the capital and the largest city of Lithuania, is faced with serious traffic problems. The main streets of the city are overcrowded with traffic. Therefore, the effective ways to ease the congestion should be sought. The paper considers the problem of high traffic intensity and congestion at the intersection of two busy Vilnius streets. Research is based on the analysis of the data stored at the Vilnius Traffic Management Centre and the information obtained in the experimental investigation of traffic flows. All the collected data have been used in the traffic simulation program, to make some effective measures helping to increase traffic capacity of the considered intersection.

Keywords

  • traffic intensity
  • free flow
  • intersection
  • velocity
Open Access

Analysis of Signal Formation and Conversion in Hybrid Radio Over Fibre Network

Published Online: 21 Jun 2013
Page range: 196 - 205

Abstract

Calculation methods of the signal formation parameters at the central station and of selective conversion in mobile terminal receiver of the vehicle moving at speed of 200-300 km per h are described. Architecture features of radio over fibre networks to operate without handover between base stations lead to additional requirements for transmitting and receiving signal methods in the network. The solution of this problem will provide high-rate services (up to 12 Mbit per second) for subscribers moving on the highway or high-speed railway using hybrid radio over fibre network. It allows providing services of any content at any time.

Objective: calculation methods development of the signal formation and conversion parameters. Signal is a set of services in the form of OFDM-symbols, the total bandwidth of which is much higher than 1 GHz.

Keywords

  • radio over fibre network
  • signal formation of services set
  • selective conversion in mobile terminal receiver
Open Access

Intermodal Logistics Processes Supported by Electronic Freight and Warehouse Exchanges

Published Online: 21 Jun 2013
Page range: 206 - 213

Abstract

Nowadays, modern companies operate in a common logistics network. In a modern approach, these networks of companies are called virtual enterprises, whose main purpose is the maximal fulfillment of customer needs and process optimization. The electronic freight and warehouse exchange is a good basis for building virtual enterprises, and that may be a new way to support the reorganization of the supply chains, and to rethink the connections within the intermodal network.

Firstly, the paper presents the need of intermodality. On the other hand, it details the benefits and the critical evaluation of intermodality. It presents the general transshipment processes and techniques then evaluates the containers based on their main features. On this basis, the paper describes the electronic freight and warehouse exchange as a member of cloud supply chain. Moreover, the paper contains the new challenges and opportunities of electronic freight and warehouse exchanges as complex logistics providers.

Keywords

  • Supply Chain
  • Intermodality
  • Container
  • Online Logistics Exchanges
  • Optimization
Open Access

Risk Analysis in Managerial Process and Fuzzy Approach

Published Online: 21 Jun 2013
Page range: 214 - 222

Abstract

One of the most important steps in managerial process is the risk analysis. While various methods for conducting the risk analysis exist, in certain conditions only subjective qualitative approach can be used. The typical reason is the lack of input quantitative data. Methods of fuzzy logic can provide a convenient way to conduct risk analyses. The article describes an application of fuzzy logic and fuzzy approach into risk analyses and into risk management process. All needed requirements for using this approach are described. The main advantage of using fuzzy approach is limitation of subjectivity in risk assessment. That can provide basis for regular repeating of risk analyses thus, efficient control system can be created instead of formal occasional risk analyses. Article also describes recommended modification of threat identification process to maximize mutual effect when applied together with this kind of risk analyses.

Keywords

  • risk analysis
  • fuzzy approach
  • risk management
Open Access

Development of Methodology and Tools for Comparative Assessment of Operational Efficiency of Kpi-Based Logistical Infrastructure Facilities

Published Online: 21 Jun 2013
Page range: 223 - 229

Abstract

The article features an approach to comparative assessments of logistics centres operational efficiency based on the system of logistics key performance indicators and describes the framework methodology and the order for the development of the methodological support of the specified task.

The study was conducted in the framework of the Rail Baltica Growth Corridor (RBGC) Russia project, which seeks to involve North-West Russia in the dialogue about Rail Baltica transport corridor and is supported by the Delegation of the European Union to Russia for the period 2012-2013. Particularly, RBGC Russia addresses the issues of operational and functional interoperability of logistics centres in Eastern Baltic Sea Region.

Keywords

  • assessment of efficiency
  • logistics activity
  • terminal and logistics complexes
  • key performance indicators of logistics activity (KPI)
  • general logistical costs model
Open Access

Numerical Simulation of Pavement Response to Dynamic Load

Published Online: 21 Jun 2013
Page range: 230 - 236

Abstract

Road structures are loaded by heavy vehicles and also they have an influence of temperature changes, which cause a difficult stress and strain distribution over layers of the pavement and the subgrade. Knowing this, distribution of stress and strain can help to better understand the behaviour of the pavement during the service time. For this purpose, the mechanical characteristics like elastic modulus, Poisson ratio, or damping ratio have to be known. The special device is used for determination of these mechanical characteristics, which loads the surface of the pavement by a force impulse. The deflections are measured in the surroundings of point of load impulse. The signal can be evaluated by use of 2D or 3D calculation model of pavement construction. In this case was used the axially-symmetric 2D model. This reduced the time consumption of individual tasks solution. The article considers also the influence of boundary conditions on deflections of models with varying width. The following text describes findings acquired from numerical simulation of pavement response to dynamic load.

Keywords

  • calculation model
  • dynamic method
  • deflection
Open Access

From Bubble to Sustainable Economy in the Baltic States

Published Online: 21 Jun 2013
Page range: 237 - 249

Abstract

The Baltic States became independent in the early 90’s, when the iron wall collapsed in the whole Eastern Europe. Thereafter, development in economic terms was rapid and particularly manufacturing and transportation sectors were responsible for prosperity formation. However, after late 90’s situation changed, and boom was apparent in credit led real estate, finance, retail and construction sectors. As these sectors are all domestically oriented, and while the Baltic States in this credit boom period did not experience any trade surpluses, it was evident that credit crunch in 2008-2009 affected economies severely. This research work shows that the Baltic States need to change again weight in Foreign Direct Investment (FDI) for manufacturing and transportation, sectors which have been supported previously only by European Investment Bank and EU Cohesion fund. FDI is vital for the Baltic States, since they have been for long time net receivers of capital, and GDP has greatly been dependent on these inflows. However, future prosperity is only built with export oriented FDI.

Keywords

  • the Baltic States
  • FDI
  • loans
  • EU cohesion
  • manufacturing
  • transportation
7 Articles
Open Access

Traffic Management Facilities Used at Intersection of Ukmergės and Geležinio Vilko Streets in Vilnius

Published Online: 21 Jun 2013
Page range: 187 - 195

Abstract

Vilnius, the capital and the largest city of Lithuania, is faced with serious traffic problems. The main streets of the city are overcrowded with traffic. Therefore, the effective ways to ease the congestion should be sought. The paper considers the problem of high traffic intensity and congestion at the intersection of two busy Vilnius streets. Research is based on the analysis of the data stored at the Vilnius Traffic Management Centre and the information obtained in the experimental investigation of traffic flows. All the collected data have been used in the traffic simulation program, to make some effective measures helping to increase traffic capacity of the considered intersection.

Keywords

  • traffic intensity
  • free flow
  • intersection
  • velocity
Open Access

Analysis of Signal Formation and Conversion in Hybrid Radio Over Fibre Network

Published Online: 21 Jun 2013
Page range: 196 - 205

Abstract

Calculation methods of the signal formation parameters at the central station and of selective conversion in mobile terminal receiver of the vehicle moving at speed of 200-300 km per h are described. Architecture features of radio over fibre networks to operate without handover between base stations lead to additional requirements for transmitting and receiving signal methods in the network. The solution of this problem will provide high-rate services (up to 12 Mbit per second) for subscribers moving on the highway or high-speed railway using hybrid radio over fibre network. It allows providing services of any content at any time.

Objective: calculation methods development of the signal formation and conversion parameters. Signal is a set of services in the form of OFDM-symbols, the total bandwidth of which is much higher than 1 GHz.

Keywords

  • radio over fibre network
  • signal formation of services set
  • selective conversion in mobile terminal receiver
Open Access

Intermodal Logistics Processes Supported by Electronic Freight and Warehouse Exchanges

Published Online: 21 Jun 2013
Page range: 206 - 213

Abstract

Nowadays, modern companies operate in a common logistics network. In a modern approach, these networks of companies are called virtual enterprises, whose main purpose is the maximal fulfillment of customer needs and process optimization. The electronic freight and warehouse exchange is a good basis for building virtual enterprises, and that may be a new way to support the reorganization of the supply chains, and to rethink the connections within the intermodal network.

Firstly, the paper presents the need of intermodality. On the other hand, it details the benefits and the critical evaluation of intermodality. It presents the general transshipment processes and techniques then evaluates the containers based on their main features. On this basis, the paper describes the electronic freight and warehouse exchange as a member of cloud supply chain. Moreover, the paper contains the new challenges and opportunities of electronic freight and warehouse exchanges as complex logistics providers.

Keywords

  • Supply Chain
  • Intermodality
  • Container
  • Online Logistics Exchanges
  • Optimization
Open Access

Risk Analysis in Managerial Process and Fuzzy Approach

Published Online: 21 Jun 2013
Page range: 214 - 222

Abstract

One of the most important steps in managerial process is the risk analysis. While various methods for conducting the risk analysis exist, in certain conditions only subjective qualitative approach can be used. The typical reason is the lack of input quantitative data. Methods of fuzzy logic can provide a convenient way to conduct risk analyses. The article describes an application of fuzzy logic and fuzzy approach into risk analyses and into risk management process. All needed requirements for using this approach are described. The main advantage of using fuzzy approach is limitation of subjectivity in risk assessment. That can provide basis for regular repeating of risk analyses thus, efficient control system can be created instead of formal occasional risk analyses. Article also describes recommended modification of threat identification process to maximize mutual effect when applied together with this kind of risk analyses.

Keywords

  • risk analysis
  • fuzzy approach
  • risk management
Open Access

Development of Methodology and Tools for Comparative Assessment of Operational Efficiency of Kpi-Based Logistical Infrastructure Facilities

Published Online: 21 Jun 2013
Page range: 223 - 229

Abstract

The article features an approach to comparative assessments of logistics centres operational efficiency based on the system of logistics key performance indicators and describes the framework methodology and the order for the development of the methodological support of the specified task.

The study was conducted in the framework of the Rail Baltica Growth Corridor (RBGC) Russia project, which seeks to involve North-West Russia in the dialogue about Rail Baltica transport corridor and is supported by the Delegation of the European Union to Russia for the period 2012-2013. Particularly, RBGC Russia addresses the issues of operational and functional interoperability of logistics centres in Eastern Baltic Sea Region.

Keywords

  • assessment of efficiency
  • logistics activity
  • terminal and logistics complexes
  • key performance indicators of logistics activity (KPI)
  • general logistical costs model
Open Access

Numerical Simulation of Pavement Response to Dynamic Load

Published Online: 21 Jun 2013
Page range: 230 - 236

Abstract

Road structures are loaded by heavy vehicles and also they have an influence of temperature changes, which cause a difficult stress and strain distribution over layers of the pavement and the subgrade. Knowing this, distribution of stress and strain can help to better understand the behaviour of the pavement during the service time. For this purpose, the mechanical characteristics like elastic modulus, Poisson ratio, or damping ratio have to be known. The special device is used for determination of these mechanical characteristics, which loads the surface of the pavement by a force impulse. The deflections are measured in the surroundings of point of load impulse. The signal can be evaluated by use of 2D or 3D calculation model of pavement construction. In this case was used the axially-symmetric 2D model. This reduced the time consumption of individual tasks solution. The article considers also the influence of boundary conditions on deflections of models with varying width. The following text describes findings acquired from numerical simulation of pavement response to dynamic load.

Keywords

  • calculation model
  • dynamic method
  • deflection
Open Access

From Bubble to Sustainable Economy in the Baltic States

Published Online: 21 Jun 2013
Page range: 237 - 249

Abstract

The Baltic States became independent in the early 90’s, when the iron wall collapsed in the whole Eastern Europe. Thereafter, development in economic terms was rapid and particularly manufacturing and transportation sectors were responsible for prosperity formation. However, after late 90’s situation changed, and boom was apparent in credit led real estate, finance, retail and construction sectors. As these sectors are all domestically oriented, and while the Baltic States in this credit boom period did not experience any trade surpluses, it was evident that credit crunch in 2008-2009 affected economies severely. This research work shows that the Baltic States need to change again weight in Foreign Direct Investment (FDI) for manufacturing and transportation, sectors which have been supported previously only by European Investment Bank and EU Cohesion fund. FDI is vital for the Baltic States, since they have been for long time net receivers of capital, and GDP has greatly been dependent on these inflows. However, future prosperity is only built with export oriented FDI.

Keywords

  • the Baltic States
  • FDI
  • loans
  • EU cohesion
  • manufacturing
  • transportation

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