Proceedings of the 20th conference on Large …, 2006
ABSTRACT The area of visualization has ,always been one of the ,most attractive sections of netwo... more ABSTRACT The area of visualization has ,always been one of the ,most attractive sections of network management,technology. Successful management,tools must not only fulfill objective management needs but also be aestheticallyappealing. Consequently, the seemingly mundane task of presenting information to the user has become,almost a true art. The application proposed in this paper is a vehicle for the presentation of network ,management ,data using interactive graphs. By using ,the Scalable Vector Graphics markup ,language ,(SVG) [1] and Asynchronous ,Javascript and XML (AJAX) [2], it strives to aid the rapid development of visually impressive management applications that are accessible through the use of a ,web browser. These highly interactive and versatile applications can respond to user actions and present data which is organized into layers and is retrieved and refreshed on demand. ,The data of these ,layers is generated ,by network management,tools that plug in to the application through the use of a modular framework. Motivation and Problem Statement The Need for Abstract Visualization Vis u a l i z a t i o n of data has always been important in many areas of human knowledge and engineering, as itallows people to perceive information in more ,efficient ways which, in turn, can expedite the learning process and help understand and deal with relevant problems more efficiently. Many network management tools resort to various forms of visualization to depict the topology of a ,computer ,network ,and the relevant information concerning it. Unfortunately, representation of additional information is often cumbersome,due to inefficient visual network topology abstraction. Furthermore, most management tools tend to use inappropriate ways of producing,their visual presentations, resulting in increased development effort and doubtful results from ,the user perspective. This is because most graphics generation libraries and APIs are too much low-level, which increases the burden of implementing,the visualization part and consequently
Digital Compression Technologies and Systems for Video Communications, 1996
ABSTRACT In this work is presented the architecture of an MPEG-1 stream transmission system appro... more ABSTRACT In this work is presented the architecture of an MPEG-1 stream transmission system appropriate for point-to-point transfer of live video and audio over TCP/IP local area networks. The hardware and software modules of the system are presented as well. Experimental results on the statistical behavior of the generated and transmitted MPEG-1 stream are quoted.
Deployment of IPv6 technology in research and commercial networks has accelerated in the last few... more Deployment of IPv6 technology in research and commercial networks has accelerated in the last few years. Inevitably, as more advanced services take advantage of the new technology, IPv6 traffic gradually increases. Today, there is limited experience in the deployment of Quality of Service (QoS) for IPv6 traffic in backbone networks that support the Differentiated Services framework. As available software and hardware are designed to handle IPv4 packets, there is a need to accurately measure and validate performance of QoS mechanisms in an IPv6 environment. This paper discusses tests and technical challenges in the deployment of IPv6 QoS in core networks, namely the production dual stack gigabit-speed Greek Research and Education Network (GRNET) and the IPv6-only 6NET European test network, using both hardware and software platforms. In either case, we succeeded in delivering advanced transport services to IPv6 traffic and provided different performance guarantees to portions of traf...
The area of visualization has ,always been one of the ,most attractive sections of network manage... more The area of visualization has ,always been one of the ,most attractive sections of network management,technology. Successful management,tools must not only fulfill objective management needs but also be aestheticallyappealing. Consequently, the seemingly mundane task of presenting information to the user has become,almost a true art. The application proposed in this paper is a vehicle for the presentation of network ,management ,data using interactive graphs. By using ,the Scalable Vector Graphics markup ,language ,(SVG) [1] and Asynchronous ,Javascript and XML (AJAX) [2], it strives to aid the rapid development of visually impressive management applications that are accessible through the use of a ,web browser. These highly interactive and versatile applications can respond to user actions and present data which is organized into layers and is retrieved and refreshed on demand. ,The data of these ,layers is generated ,by network management,tools that plug in to the application thro...
Proceedings of the 20th conference on Large …, 2006
ABSTRACT The area of visualization has ,always been one of the ,most attractive sections of netwo... more ABSTRACT The area of visualization has ,always been one of the ,most attractive sections of network management,technology. Successful management,tools must not only fulfill objective management needs but also be aestheticallyappealing. Consequently, the seemingly mundane task of presenting information to the user has become,almost a true art. The application proposed in this paper is a vehicle for the presentation of network ,management ,data using interactive graphs. By using ,the Scalable Vector Graphics markup ,language ,(SVG) [1] and Asynchronous ,Javascript and XML (AJAX) [2], it strives to aid the rapid development of visually impressive management applications that are accessible through the use of a ,web browser. These highly interactive and versatile applications can respond to user actions and present data which is organized into layers and is retrieved and refreshed on demand. ,The data of these ,layers is generated ,by network management,tools that plug in to the application through the use of a modular framework. Motivation and Problem Statement The Need for Abstract Visualization Vis u a l i z a t i o n of data has always been important in many areas of human knowledge and engineering, as itallows people to perceive information in more ,efficient ways which, in turn, can expedite the learning process and help understand and deal with relevant problems more efficiently. Many network management tools resort to various forms of visualization to depict the topology of a ,computer ,network ,and the relevant information concerning it. Unfortunately, representation of additional information is often cumbersome,due to inefficient visual network topology abstraction. Furthermore, most management tools tend to use inappropriate ways of producing,their visual presentations, resulting in increased development effort and doubtful results from ,the user perspective. This is because most graphics generation libraries and APIs are too much low-level, which increases the burden of implementing,the visualization part and consequently
Digital Compression Technologies and Systems for Video Communications, 1996
ABSTRACT In this work is presented the architecture of an MPEG-1 stream transmission system appro... more ABSTRACT In this work is presented the architecture of an MPEG-1 stream transmission system appropriate for point-to-point transfer of live video and audio over TCP/IP local area networks. The hardware and software modules of the system are presented as well. Experimental results on the statistical behavior of the generated and transmitted MPEG-1 stream are quoted.
Deployment of IPv6 technology in research and commercial networks has accelerated in the last few... more Deployment of IPv6 technology in research and commercial networks has accelerated in the last few years. Inevitably, as more advanced services take advantage of the new technology, IPv6 traffic gradually increases. Today, there is limited experience in the deployment of Quality of Service (QoS) for IPv6 traffic in backbone networks that support the Differentiated Services framework. As available software and hardware are designed to handle IPv4 packets, there is a need to accurately measure and validate performance of QoS mechanisms in an IPv6 environment. This paper discusses tests and technical challenges in the deployment of IPv6 QoS in core networks, namely the production dual stack gigabit-speed Greek Research and Education Network (GRNET) and the IPv6-only 6NET European test network, using both hardware and software platforms. In either case, we succeeded in delivering advanced transport services to IPv6 traffic and provided different performance guarantees to portions of traf...
The area of visualization has ,always been one of the ,most attractive sections of network manage... more The area of visualization has ,always been one of the ,most attractive sections of network management,technology. Successful management,tools must not only fulfill objective management needs but also be aestheticallyappealing. Consequently, the seemingly mundane task of presenting information to the user has become,almost a true art. The application proposed in this paper is a vehicle for the presentation of network ,management ,data using interactive graphs. By using ,the Scalable Vector Graphics markup ,language ,(SVG) [1] and Asynchronous ,Javascript and XML (AJAX) [2], it strives to aid the rapid development of visually impressive management applications that are accessible through the use of a ,web browser. These highly interactive and versatile applications can respond to user actions and present data which is organized into layers and is retrieved and refreshed on demand. ,The data of these ,layers is generated ,by network management,tools that plug in to the application thro...
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Papers by Dimitrios Kalogeras