Vasileios Gkamas

Vasileios Gkamas
Computer Technology Institute and Press | CIT · Greek School Network and Networking Technologies

Computer Engineering and Informatics, Phd

About

21
Publications
1,859
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
127
Citations

Publications

Publications (21)
Conference Paper
Full-text available
Given the overall Data Science and IoT impact on the European economy – the impact of the European Data Market on the EU economy as a whole exceeded the threshold of €400 Billion in 2019 – there is a constant demand for experts at both domains. Although many training programs exist at different levels of education (i.e. higher education, VET) a ski...
Conference Paper
This work presents a new and robust teleconference service provided by the Greek School Network (GSN) organization to the school community. The web-based teleconference service, formally entitled meeting.sch.gr, enables the Greek school community to immerse and fruitfully collaborate in various educational activities, as also to participate in semi...
Conference Paper
This work presents a case study for the integration of two web-based systems, the ‟Kaltura” video platform and the ‟Photodentro Video” digital repository. The integration is based on the Open Archives Initiative Protocol for Metadata Harvesting and an associated automation, transformation, and push/pull notification strategy. Kaltura is a video man...
Conference Paper
Full-text available
The paper presents the Open Educational Practices (OEP) initiative that was implemented in Greece, as part of the national strategy for digital educational content in primary and secondary education. It aimed at encouraging and motivating teachers to develop and share OEPs that draw upon the use and reuse of Open Educational Resources (OERs), found...
Conference Paper
This work studies the energy-minimized multi-layer operation of IP over flexible optical networks, under a dynamic traffic scenario. We extend a multi-layer connection establishment algorithm to jointly optimize the energy consumption of both IP and optical layers. We compare the performance of the proposed energy-aware multi-layer connection estab...
Article
Energy efficiency is an important desirable property for optical networks and a key parameter for the sustainability of the future Internet. In this work, we consider the energy-minimized design problem for IP over flexible optical networks. We provide an energy-aware multilayer network-planning algorithm, which takes as input the network topology,...
Article
Full-text available
We consider the multi-layer network planning problem for IP over flexible optical networks, which consists of three subproblems at two layers: the Routing problem at the IP-layer (IPR), the routing, modulation level (RML), and the spectrum allocation (SA) problems at the optical layer. The input includes the IP end-to-end traffic matrix, the modula...
Article
Full-text available
We propose a joint multi-layer planning algorithm for IP over flexible optical networks, and use it, to compare the performance of joint as opposed to sequential multi-layer network planning in terms of spectrum and cost.
Chapter
This chapter describes routing and medium access control (MAC) mechanisms for providing Quality of Service (QoS) together with energy savings in wireless ad hoc networks. The proposed mechanisms operate in a cross-layer optimization logic, in the direction of either minimizing total energy consumption in the network or maximizing network lifetime,...
Article
Full-text available
A determinant factor for the introduction of grid technologies in production domains of scale can be the design of easy, fast and, from an operational point of view, realizable deployment procedures. Remote system management technologies, typically used to monitor and manage IT environments, are designed to offer remote software installation functi...
Article
Full-text available
In this paper we present a CPU scavenging architecture suitable for desktop resources, and we study its appropriateness in exploiting the PC Laboratory resources of the Greek School Network and their integration to the existing HellasGrid national infrastructure. School laboratories form an extensive network equipped with computational systems and...
Article
This chapter describes routing and medium access control (MAC) mechanisms for providing Quality of Service (QoS) together with energy savings in wireless ad hoc networks. The proposed mechanisms operate in a cross-layer optimization logic, in the direction of either minimizing total energy consumption in the network or maximizing network lifetime,...
Article
We propose and evaluate the performance of a new MAC-layer protocol for mobile ad hoc networks, called the Slow Start Power Controlled (abbreviated SSPC) protocol. SSPC improves on IEEE 802.11 by using power control for the RTS/CTS and DATA frame transmissions, so as to reduce energy consumption and increase network throughput and lifetime. In our...
Conference Paper
Full-text available
We present the conceptual basis and the initial planning for an open source management architecture for wireless sensor networks (WSN). Although there is an abundance of open source tools serving the administrative needs of WSN deployments, there is a lack of tools or platforms for high level integrated WSN management. This is because of a variety...
Conference Paper
We present the conceptual basis and the initial planning for an open source management architecture for wireless sensor networks (WSN). Although there is an abundance of open source tools serving the administrative needs of WSN deployments, there is a lack of tools or platforms for high level integrated WSN management. The current work is, to our k...
Article
Full-text available
The existence of good probabilistic models for the job arrival process and the delay components introduced at different stages of job processing in a Grid environment is important for the improved understanding of the Grid computing concept. In this study, we present a thorough analysis of the job arrival process in the EGEE infrastructure and of t...
Conference Paper
Full-text available
The existence of good probabilistic models for the job arrival process and the delay components introduced at the different stages of job processing in a grid environment is important for the improved understanding of the computing concept envisioned by the Grid. In this study, we present a thorough analysis of the job arrival process in the EGEE i...
Conference Paper
We propose a MAC protocol for mobile ad hoc networks that uses power control for the RTS/CTS and DATA frame transmissions in order to improve energy and capacity utilization efficiency. Unlike IEEE 802.11, in our scheme the RTS frames are not sent using the maximum transmission power to silence neighbouring nodes, and the CTS frames do not silence...

Network

Cited By

Projects

Projects (2)