Evangelos N. Gazis

Subscription management and charging for value added services in UMTS networks

We propose a novel architecture for value added services provision in UMTS networks. The key idea is to introduce a model which is capable of handling efficiently subscription management, as well as charging, billing and accounting for value added services that are provided either by the network provider or third trusted parties. We propose a flexible business model in line with the arising requirements for openness and dynamic subscription and introduce an integrated system that employs a flexible charging scheme for each type of service usage (transport and value added), so that the user will receive only one itemised bill for all services. As a result, the user is able to access a large number of services provided by independent providers, without the need for any additional contracts.

Adaptive charging accounting and billing system for the support of advanced business models for VAS provision in 3G systems

In the framework of the design of a flexible service provision platform for 3G systems and beyond, an integrated system for enabling advanced Charging, accounting and billing has been introduced. The CAB system is adaptive to VAS charging requirements and network/business environment concepts. Part of the system has been developed in the frame of IST-MOBIVAS project.

A quality assurance and quality control (QA QC) procedure of the monitored drift tubes (MDT) for the BIS-chambers of the ATLAS muon spectrometer

The ATLAS detector for the Large Hadron Collider at CERN of which construction has recently started, will study the products of proton collisions at energies of up to 14 TeV. One of its subdetectors is a high-resolution Muon Spectrometer designed to exploit the physics potentials of the collisions. It consists of 1206 Monitored Drift Tube (MDT) chambers, which will be built in 13 institutes of the ATLAS collaboration. Three Greek Universities (University of Athens, National Technical University and University of Thessaloniki) have undertaken the responsibility to construct 30 000 drift tubes of 1.67 length, to test them and to finally to build 128 BIS (Barrel Inner Small) chambers. Dedicated setups have been developed and automated at the National Technical University of Athens for the Quality Assurance and Quality Control (QA QC) procedures of the drift tubes. The QA QC tests include anode wire tension measurement, high voltage dark current measurement, anode wire displacement measurement and gas leak-rate measurement of the end-plugs and the cylinder. Up to now about 10 000 drift tubes have been tested.

Design and Development of Essential Use-Cases for Self-management in Future Internet Wireless Networks

The paper discusses and describes several selected use-cases for autonomic/cognitive management purposes in the scope of the Future Internet (FI) evolution, as these have been identified upon the original context of the EU-funded Self-NET Project effort. The essential aim is to “delimit” new paradigms for the management of complex and heterogeneous wireless network infrastructures and systems, by proposing the operation of self-managed FI elements around a novel feedback-control cycle, known as the MDE cognitive cycle. Thus, the paper intends to “identify” an integrated validation environment for the prototyping and the assessment of relevant concepts and artifacts, via the establishment of appropriate use-cases and corresponding scenarios of use and the explicit description/set-up of relevant test-beds and/or implementation platforms, towards network and node management. The three proposed use-cases have been selected as “proper drivers” for the design and the validation of Self-NET architecture and concepts.

Implementation of the Legendre transform for the muon track segment reconstruction in the ATLAS MDT chambers

In this study, the geometrical properties of the Legendre transform are used to implement a segment reconstruction algorithm for drift tube chambers used in high energy physics experiments. The output signal of a drift tube chamber consists of co-centric circles in each drift tube that define the possible points of the charged particle trajectory. The particle track is reconstructed as the common tangent line to the drift circles. The method is tested on an ideal case and on a case of high noisy conditions using Monte Carlo generated tracks.