2009
[11]
G. Oikonomou, T. Apostolopoulos, "Web-Based Management of Distributed Services", in Advances in Electrical Engineering and Computational Science, ser. Lecture Notes in Electrical Engineering, Springer Netherlands, 39, pp. 255-266, 2009 (invited)
This paper presents WebDMF, a Web-based Framework for the Management of Distributed services. It is based on the Web-based Enterprise Management (WBEM) family of standards and introduces a middleware layer of entities called "Representatives". WebDMF can be integrated with existing WBEM infrastructures and is not limited to monitoring. On the contrary, it is capable of actively modifying the run-time parameters of a managed service. Due to its abstract design, it is suitable for the management of a variety of distributed services, such as grids and content delivery networks. The paper includes a discussion on WebDMF's design, implementation and advantages. We also present experiments on an emulated network topology as an indication of the framework's viability.
2008
[10]
G. Oikonomou, T. Apostolopoulos, "Web-Based Management of Content Delivery Networks", in Proc. 19th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management (DSOM). Managing Large Scale Service Deployment (MANWEEK 08), Samos, Greece, pp. 42-54, 2008
Abstract overlay networks have been considered enablers of efficient management for decentralized, large scale service deployments. A Content Delivery Network (CDN) is an example of service falling within this category. The result of our research is WebDMF, a management framework for distributed services based on the Web-Based Enterprise Management (WBEM) family of specifications. Abstract design, combined with a middleware layer of entities called "Representatives", makes WebDMF suitable for the management of a variety of services. Details related to the management of each particular service are detached from the representative logic. This paper discusses how WebDMF can be used for the management of CDNs. A WBEM provider resides on each host participating in the service deployment and implements CDN-specific operations. WebDMF representatives decentralize, unify and coordinate those on a deployment scale. Preliminary measurements on an emulated network topology are also presented as an indication of the solution's viability and scalability.
[9]
G. Oikonomou, T. Apostolopoulos, "WebDMF: A Web-Based Management Framework for Distributed Services", in Proc. The 2008 International Conference of Parallel and Distributed Computing (ICPDC 08), 1, London, UK, pp. 593-598, 2008
This paper presents WebDMF, a Web-based Framework for the Management of Distributed services. It is based on the Web-based Enterprise Management (WBEM) family of standards and introduces a middleware layer of entities called "Representatives". WebDMF can be integrated with existing WBEM infrastructures and is not limited to monitoring. On the contrary, it is capable of actively modifying the run-time parameters of the managed application. Its design is abstract and suitable for a variety of distributed services, such as grids and content delivery networks. The paper includes a discussion on WebDMF's design, implementation and advantages. We also present experiments on an emulated network topology as an indication of the framework's viability.
[8]
G. Oikonomou, T. Apostolopoulos, "Using a Web-Based Framework to Manage Grid Deployments", in Proc. The 2008 International Conference on Grid Computing and Applications (GCA 08), Las Vegas, USA, pp. 10-16, 2008
WebDMF is a Web-based Framework for the Management of Distributed services. It is based on the Web-based Enterprise Management (WBEM) standards family and introduces a middleware layer of entities called "Representatives". Details related to the managed application are detached from the representative logic, making the framework suitable for a variety of services. WebDMF can be integrated with existing WBEM infrastructures and is complementary to web service-based management efforts. This paper describes how the framework can be used to manage grids without modifications to existing installations. It compares the proposed solution with other research initiatives. Experiments on an emulated network topology indicate its viability.
2007
[7]
G. Oikonomou, T. Apostolopoulos, "A Framework for the Management of Distributed Systems Based on SNMP", in Proc. 22nd International Symposium on Computer and Information Sciences (ISCIS 07), Ankara, Turkey, pp. 1-6, 2007
The traditional task of managing and monitoring a network has never been a trivial one. With recent changes in computing and networking, the area of distributed systems management faces new challenges and increasing complexity. Research in the relevant field reveals that, while there are many research and commercial solutions available, some of them are based on proprietary standards. Others focus on monitoring, while lacking the ability to actively make modifications and fine-tuning. Some others have a narrow target group. This paper proposes a framework for the management of distributed applications. The managed hosts are treated as integral parts of the deployment and not as stand alone, isolated entities. The framework is based on SNMP and is not limited to monitoring. On the contrary, it is capable of carrying out SNMP-SET commands, actively modifying the run-time parameters of the managed application. Finally, it can perform the management of a variety of distributed systems, ranging from small clusters to larger scale deployments such as computational or data grids.
[6]
T. Apostolopoulos, G. Oikonomou, G. Parissis, "Broadband in Greece. Perspective and Challenges", Greek Computer Society Press, pp. 28-30, 2007 (in Greek)
2006
[5]
G. Oikonomou, V. Karakoidas, T. Apostolopoulos, "Pegasus: Competitive Load Balancing Using inetd", in Proc. 5th System Administration and Network Engineering Conference (SANE 2006), Delft, The Netherlands, pp. 59-68, 2006 (refereed paper)
2005
[4]
T. Apostolopoulos, I. Kapetanakis, G. Oikonomou, "An Architecture for the Management of Smart Cards by Mobile Devices Using Java Technologies", in Proc. 7th International IEEE Conference on E-Commerce Technology (CEC 2005), Munich, Germany, pp. 527-530, 2005 (short paper)
Smart cards are cards with memory and a processor, ideal for authentication and secure applications. Mobile devices have an extraordinary spread; people carry them along at all times. The ability to combine the features of those two devices is quite compelling. We used technologies of the Java family in order to achieve this. In our work, we designed an architecture for the management of smart cards by mobile devices. The system is built up from three components, the Java card applet, the mobile application and the Java card-mobile device gateway. For the purposes of our work and as proof of concept, we developed a sample electronic wallet application. Finally, we extended the proposed system's functionality and described a business case, where the system could be used in the future.
2004
[3]
T. Apostolopoulos, G. Oikonomou, "Overtester: A Peer-to-Peer, Modular Toolkit for Network Performance Evaluation", in Proc. The Fourth International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 04), Newcastle, UK, pp. 404-407, 2004 (short paper)
The field of network performance evaluation is of great significance for researchers and network administrators alike. This has resulted in a great number of applications designed to aid the process. These applications vary quite a bit, ranging from simple tools, such as the famous ping program all the way to complex and sophisticated ones. OverTester resides on top of other performance measurement programs, like a management console, automating and co-coordinating the process. It is Modular, while its most significant features are its Peer-to-Peer and Cross-Platform nature.
[2]
T. Apostolopoulos, G. Oikonomou, "A Scalable, Extensible Framework for Grid Management", in Proc. IASTED International Conference on Parallel and Distributed Computing and Networks (PDCN 2004), Innsbruck, Austria, 2004
The picture of global computing is rapidly changing. In the last few years, with the progress made in the area of computer networks, standalone desktop computers became largely interconnected. And then grid computing came along. Managing and monitoring a network had never been a trivial task and many efforts have been made in this direction. A variety of protocols have been proposed and standards have arisen in order to facilitate this process. Now the task has become even more complex. Not only do we have the need to monitor and manage the underlying network, but also the availability and utilisation of shared resources. From simple resources such as CPU cycles and storage space, all the way to complicated equipment used for specific purposes, such as medical or scientific instruments. Our vision is of a management framework for grid deployments, that is easy to use, scalable, secure and modular. We propose a framework that has been designed in order to satisfy the above criteria. Furthermore, it is based on open standards, which makes it easy to implement and integrate with existing management systems.
2003
[1]
T. Apostolopoulos, G. Oikonomou, N. Chatzivasdekis, "Statistical Analysis of the Performance of IEEE 802.11 LANs", in Proc. IASTED International Conference on Communication Systems and Networks (CSN 2003), Benalmadena, Spain, pp. 151-156, 2003
Wireless LAN technology is relatively new and rapidly developing. The performance of such networks is of great importance and deep understanding is required in order to take advantage of their full potential. In our work, we installed an infrastructure IEEE 802.11b compliant Wireless LAN in the Computer and Communication Systems Laboratory, measured its performance and analyzed it, using statistical methods. Our ultimate goal was to study the impact of various operational parameters on the aforementioned performance.
Powered by bibtexbrowser
Conditions for Downloading Publications from This Site.

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. These works may not be reposted without explicit permission from the copyright holder.

Filter / Sort
Reset