We survey different optimization problems under uncertainty which arise in telecommunications. Three levels of decisions are distinguished: design of structural elements of telecommunication networks, top level design of telecommunication networks and design of optimal policies of telecommunication enterprize. Examples of typical problems from each level show that the stochastic programming par...

A computer network management system presents one manager and several agents. The management of large networks demands much computer resources and management system capacity, impossible to achieve with just one manager. The TMN standard, that intends to standardize management systems for telecommunication networks offering those resources, already foresees the use of several managers organized ...

According to current models of word recognition, the time to recognize a word would be affected by the frequency of its neighbors. The present study examined the role of neighborhood frequency in spoken word recognition, using a definition of the neighborhood in terms of the last candidates of the cohort aligned from onset with the input [8]. Two sets of disyllabic CVCV words were selected whic...

1 Loss System For a background review, I started the summer vacation scholorship by looking at loss systems. In a telecommunication context, this means that a new coming call is blocked (or lost) if there is no free circuits for that call. First of all, I made myself familiar with the notations. In a loss system, let C be the total number of circuits available, n be the number of circuits in us...

New telecommunication services and mobility networks have introduced databases in telecommunication networks. Compared with traditional use of databases, telecom databases must fulfill very tough requirements on response time, throughput, and availability. ClustRa is a telecom database prototype developed to run on standard workstations interconnected by an ATM switch. To meet the throughput an...

In the last two decades the Specification and Description Language (SDL) has been established in the telecommunication sector as a domainspecific modeling language. A disadvantage of SDL is the fact that only a small number of modeling tools for SDL is available. Another graphical modeling language is the Unified Modeling Language (UML) used for the model-based development of software systems. ...

The mobile telecommunication industry is becoming one of the most important industries in the world. In the spectrum of wireless communication technologies, digital cellular telecommunication using the Global System of Mobile Communication (GSM) standard has enjoyed the fastest growth rate. GSM has been adopted in more than one hundred countries, with spectacular national growths regardless of ...

With the advent of the iPhone AppStore and Google Play, the ’walled garden’ approach of telecommunication companies to supply content to their customers using standard GSM/UMTS/LTE authentication has failed: Neither Google nor Apple, nor any other content provider on the mobile internet, uses the SIM card for authentication. This is mainly due to the fact that mobile telecommunication and inter...

The growing number of unauthorized activities and various trends of networking technologies in telecommunication network have added heavy burdens to telecommunication performance management (PM) system. One-class-support vector machine (OCSVM) is introduced in this paper, to automatically detect network anomalies. Real telecommunication performance data are employed in this paper to investigate...