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

Search

Volume 21 (2020): Issue 3 (June 2020)

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

Search

6 Articles
Open Access

Performace Evaluation of Vehicular Communication

Published Online: 25 Jun 2020
Page range: 171 - 180

Abstract

Abstract

Modern societies are built on good road infra-structure and efficient transport system. Safety is a high-priority consideration in development of road traffic systems. In recent years the weather information has become becomes very vital for road traffic safety because slippery roads are the key source of road accidents in northern regions of Europe, America and Canada as well. In this article we are presenting the test experiences and pilot road weather related services by executing a set of Vehicle to Infrastructure (V2I) communication scenarios by using IEEE 802.11p and 5G test networks. We have made an effort to evaluate the performance of IEEE 802.11p and 3GPP (3rd Generation Partnership Project) 5G test network. We also analyzed the performance of IEEE 802.11p with and without safety feature for secure and reliable vehicular communication. The combination of IEEE 802.11p with 5G test network cellular network makes the traffic system heterogeneous for traffic safety. This heterogeneous system provides the opportunity to exploit the vehicle-based actuators, sensor, and observation data in order to produce the intelligent service platform and up-to-date real time services for vehicles.

In this article we have also made a comparison by using an IEEE 802.11p system having safety feature of SafeCOP (Safe Co-operating Cyber-Physical Systems using Wireless Communication) project. SafeCOP is a European project that aims cyber-physical systems-of-systems relying on wireless communication for safe and secure cooperation. This safety feature will help to decrease the amount of road accidents (Car crashes, injuries and fatalities) by offering safe and secure V2V and V2I co-operation. The fundamental advantage of this kind of performance analysis is that the communication between Vehicle-to-Road Weather station (V2RWS) can be exchanged safely and reliably, at the cost of network resources consumed by a safety feature in IEEE 802.11p. It’s clearly presented in this paper, that the use of heterogeneous network and SafeCOP feature for vehicular networking has a clear potential in near future for vehicle’s safety and security of vehicular network.

Keywords

  • V2I
  • V2RWS
  • SafeCOP
  • IEEE 802.11p
  • 5G Test Network
Open Access

QoS to QoE Mapping Function for Iptv Quality Assessement Based on Kohonen Map: A Pilot Study

Published Online: 25 Jun 2020
Page range: 181 - 190

Abstract

Abstract

This paper deals with an analysis of Kohonen map usage possibility for real-time evaluation of end-user video quality perception. The Quality of Service framework (QoS) describes how the network impairments (network utilization or packet loss) influence the picture quality, but it does not reflect precisely on customer subjective perceived quality of received video stream. There are several objective video assessment metrics based on mathematical models trying to simulate human visual system but each of them has its own evaluation scale. This causes a serious problem for service providers to identify a critical point when intervention into the network behaviour is needed. On the other hand, subjective tests (Quality of Experience concept) are time-consuming and costly and of course, cannot be performed in real-time. Therefore, we proposed a mapping function able to predict subjective end-user quality perception based on the situation in a network, video stream features and results obtained from the objective video assessment method.

Keywords

  • IPTV
  • Kohonen map
  • Mapping function
  • QoE
  • QoS
Open Access

Review of Inventory Control Models: A Classification Based on Methods of Obtaining Optimal Control Parameters

Published Online: 25 Jun 2020
Page range: 191 - 202

Abstract

Abstract

Inventory control has been a major point of discussion in industrial engineering and operations research for over 100 years. Various advanced numerical methods can be used for solving inventory control problems, which makes it a highly multidisciplinary filed attracting researchers from different academic disciplines. This fact makes it a daunting task to subsume the gargantuan spectrum of literature related to inventory control theory in one treatise. In light of this fact, this paper focuses on the timeline of inventory control models with respect to methodologies behind deriving optimal control parameters. Such methodologies include analytical approaches, optimal control theory, dynamic programming, simulation-based optimization and metamodel-based optimization.

Keywords

  • evolution of inventory control
  • classification of inventory models
  • optimal control parameters
  • review
Open Access

Using an Adapted Zachman Framework for Enterprise Architecture in the Development of an Industry Methodology of Integrated Supply Chain Planning

Published Online: 25 Jun 2020
Page range: 203 - 210

Abstract

Abstract

Trends in the digitalization of business open up opportunities for the use of fundamental approaches to the development of enterprise architecture in the creation of appropriate methodologies.

The article discusses the approach to the use of adapted Zachman framework for enterprise architecture as a basis for the systematization and structuring of the industry methodologies of integrated supply chain planning based on SCOR model. A practical example of using the proposed approach for description of one of the target processes - tactical supply chain planning is considered.

Keywords

  • Enterprise architecture
  • Zachman framework
  • SCOR
  • SCM
Open Access

European Regional Airport: Factors Influencing Efficency

Published Online: 25 Jun 2020
Page range: 211 - 220

Abstract

Abstract

During the recent decade a lot of research has been focused on identification of the importance of regional airport for the local economy and the measuring and predicting of the airport’s efficiency. With regard to individual airport planning it turns out that airports are not free in the optimization of infrastructure due the need to comply international aviation standards and recommended practices, one the one hand, and the tendency of air transportation system development including aircraft design and airlines’ fleet development, on the other. Furthermore, it is also important to take into account the specificity of each particular airport, including the traffic variability resulting from seasonality, with the airport’s mission geared to it. We found, tha t one of the reasons for the relatively low efficiency of regional airports, given the general trend in the growth in the number of seats for narrow-body aircraft. Likewise, it has been found, that the seasonality of air traffic at regional airports is comparatively high. In addition, this paper spotlights the ways the theoretical model of returns to scale affects the efficiency of the apron of the regional airport and briefly discusses the different interpretations of the definition of regional airport.

Keywords

  • regional airport
  • airport efficiency
  • air traffic variability
  • regional aircraft
Open Access

Investigating the Effects of Active Travel in Health and Quality of Life

Published Online: 25 Jun 2020
Page range: 221 - 230

Abstract

Abstract

The ever-increasing tendency of people to travel by motorized vehicles contributes significantly to air pollution and traffic problems. Active travel, namely walking and cycling, seems to be a feasible solution to the current situation in urban mobility. The present paper aims at investigating the effects of active travel in health and quality of life and determine those factors that affect travel behavior. A structured literature review was carried out, which revealed the strong association of walking/cycling with the containment of noncommunicable diseases and the invigoration of wellbeing and self-confidence. In addition, a questionnaire survey was conducted in Greece, addressing the attitudes and perceptions of 507 people towards active travel, health and quality of life. Results showed that participants have a more positive attitude about walking compared to cycling, while characteristics such as age, gender, body mass index, physical and health conditions determine active commuting and consequently life satisfaction.

Keywords

  • Sustainability
  • walking
  • cycling
  • physical activity
  • wellbeing
  • travel behavior
6 Articles
Open Access

Performace Evaluation of Vehicular Communication

Published Online: 25 Jun 2020
Page range: 171 - 180

Abstract

Abstract

Modern societies are built on good road infra-structure and efficient transport system. Safety is a high-priority consideration in development of road traffic systems. In recent years the weather information has become becomes very vital for road traffic safety because slippery roads are the key source of road accidents in northern regions of Europe, America and Canada as well. In this article we are presenting the test experiences and pilot road weather related services by executing a set of Vehicle to Infrastructure (V2I) communication scenarios by using IEEE 802.11p and 5G test networks. We have made an effort to evaluate the performance of IEEE 802.11p and 3GPP (3rd Generation Partnership Project) 5G test network. We also analyzed the performance of IEEE 802.11p with and without safety feature for secure and reliable vehicular communication. The combination of IEEE 802.11p with 5G test network cellular network makes the traffic system heterogeneous for traffic safety. This heterogeneous system provides the opportunity to exploit the vehicle-based actuators, sensor, and observation data in order to produce the intelligent service platform and up-to-date real time services for vehicles.

In this article we have also made a comparison by using an IEEE 802.11p system having safety feature of SafeCOP (Safe Co-operating Cyber-Physical Systems using Wireless Communication) project. SafeCOP is a European project that aims cyber-physical systems-of-systems relying on wireless communication for safe and secure cooperation. This safety feature will help to decrease the amount of road accidents (Car crashes, injuries and fatalities) by offering safe and secure V2V and V2I co-operation. The fundamental advantage of this kind of performance analysis is that the communication between Vehicle-to-Road Weather station (V2RWS) can be exchanged safely and reliably, at the cost of network resources consumed by a safety feature in IEEE 802.11p. It’s clearly presented in this paper, that the use of heterogeneous network and SafeCOP feature for vehicular networking has a clear potential in near future for vehicle’s safety and security of vehicular network.

Keywords

  • V2I
  • V2RWS
  • SafeCOP
  • IEEE 802.11p
  • 5G Test Network
Open Access

QoS to QoE Mapping Function for Iptv Quality Assessement Based on Kohonen Map: A Pilot Study

Published Online: 25 Jun 2020
Page range: 181 - 190

Abstract

Abstract

This paper deals with an analysis of Kohonen map usage possibility for real-time evaluation of end-user video quality perception. The Quality of Service framework (QoS) describes how the network impairments (network utilization or packet loss) influence the picture quality, but it does not reflect precisely on customer subjective perceived quality of received video stream. There are several objective video assessment metrics based on mathematical models trying to simulate human visual system but each of them has its own evaluation scale. This causes a serious problem for service providers to identify a critical point when intervention into the network behaviour is needed. On the other hand, subjective tests (Quality of Experience concept) are time-consuming and costly and of course, cannot be performed in real-time. Therefore, we proposed a mapping function able to predict subjective end-user quality perception based on the situation in a network, video stream features and results obtained from the objective video assessment method.

Keywords

  • IPTV
  • Kohonen map
  • Mapping function
  • QoE
  • QoS
Open Access

Review of Inventory Control Models: A Classification Based on Methods of Obtaining Optimal Control Parameters

Published Online: 25 Jun 2020
Page range: 191 - 202

Abstract

Abstract

Inventory control has been a major point of discussion in industrial engineering and operations research for over 100 years. Various advanced numerical methods can be used for solving inventory control problems, which makes it a highly multidisciplinary filed attracting researchers from different academic disciplines. This fact makes it a daunting task to subsume the gargantuan spectrum of literature related to inventory control theory in one treatise. In light of this fact, this paper focuses on the timeline of inventory control models with respect to methodologies behind deriving optimal control parameters. Such methodologies include analytical approaches, optimal control theory, dynamic programming, simulation-based optimization and metamodel-based optimization.

Keywords

  • evolution of inventory control
  • classification of inventory models
  • optimal control parameters
  • review
Open Access

Using an Adapted Zachman Framework for Enterprise Architecture in the Development of an Industry Methodology of Integrated Supply Chain Planning

Published Online: 25 Jun 2020
Page range: 203 - 210

Abstract

Abstract

Trends in the digitalization of business open up opportunities for the use of fundamental approaches to the development of enterprise architecture in the creation of appropriate methodologies.

The article discusses the approach to the use of adapted Zachman framework for enterprise architecture as a basis for the systematization and structuring of the industry methodologies of integrated supply chain planning based on SCOR model. A practical example of using the proposed approach for description of one of the target processes - tactical supply chain planning is considered.

Keywords

  • Enterprise architecture
  • Zachman framework
  • SCOR
  • SCM
Open Access

European Regional Airport: Factors Influencing Efficency

Published Online: 25 Jun 2020
Page range: 211 - 220

Abstract

Abstract

During the recent decade a lot of research has been focused on identification of the importance of regional airport for the local economy and the measuring and predicting of the airport’s efficiency. With regard to individual airport planning it turns out that airports are not free in the optimization of infrastructure due the need to comply international aviation standards and recommended practices, one the one hand, and the tendency of air transportation system development including aircraft design and airlines’ fleet development, on the other. Furthermore, it is also important to take into account the specificity of each particular airport, including the traffic variability resulting from seasonality, with the airport’s mission geared to it. We found, tha t one of the reasons for the relatively low efficiency of regional airports, given the general trend in the growth in the number of seats for narrow-body aircraft. Likewise, it has been found, that the seasonality of air traffic at regional airports is comparatively high. In addition, this paper spotlights the ways the theoretical model of returns to scale affects the efficiency of the apron of the regional airport and briefly discusses the different interpretations of the definition of regional airport.

Keywords

  • regional airport
  • airport efficiency
  • air traffic variability
  • regional aircraft
Open Access

Investigating the Effects of Active Travel in Health and Quality of Life

Published Online: 25 Jun 2020
Page range: 221 - 230

Abstract

Abstract

The ever-increasing tendency of people to travel by motorized vehicles contributes significantly to air pollution and traffic problems. Active travel, namely walking and cycling, seems to be a feasible solution to the current situation in urban mobility. The present paper aims at investigating the effects of active travel in health and quality of life and determine those factors that affect travel behavior. A structured literature review was carried out, which revealed the strong association of walking/cycling with the containment of noncommunicable diseases and the invigoration of wellbeing and self-confidence. In addition, a questionnaire survey was conducted in Greece, addressing the attitudes and perceptions of 507 people towards active travel, health and quality of life. Results showed that participants have a more positive attitude about walking compared to cycling, while characteristics such as age, gender, body mass index, physical and health conditions determine active commuting and consequently life satisfaction.

Keywords

  • Sustainability
  • walking
  • cycling
  • physical activity
  • wellbeing
  • travel behavior

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