When estimating causal effects from observational data, it is desirable to replicate a randomized experiment as closely as possible, for example, by obtaining treated and control groups with extremely similar distributions of observed covariates. This goal can often be achieved by choosing a subsample from the original control group that matches the treatment group on the distribution of these ...

The computer and telecommunication industries rely heavily on knowledge-based expert systems to manage the performance of their networks. These expert systems are developed by knowledge engineers, who must first interview domain experts to extract the pertinent knowledge. This knowledge acquisition process is laborious and costly, and typically is better at capturing qualitative knowledge than ...

For almost all applications within the telecommunication area speed and quality of data transfer is a very important factor. A main reason for using mobile agents in the telecommunication world is that there is a potential for better performance. In particular for mobile telecommunication networks like GSM, mobile agent technology can have considerable advantages. This is based on the fact that...

Early detection of significant traumatic events, e.g. a terrorist attack or a ship capsizing, is important to ensure that a prompt emergency response can occur. In the modern world telecommunication systems could play a key role in ensuring a successful emergency response by detecting such incidents through significant changes in calls and access to the networks. In this paper a methodology is ...

The elicitation, modeling and analysis of requirements have consistently been one of the main challenges during the development of complex systems. Telecommunication systems belong to this category of systems due to the worldwide distribution and the heterogeneity of today’s telecommunication networks. Many proposals have been made for approaches that allow the developer to describe system beha...

Personal mobility (PM) is one of the key issues in realizing personal communications service (PCS) in emerging thirdgeneration mobile communication networks such as International Mobile Telecommunication 2000 (IMT-2000). It can be realized through universal personal telecommunication (UPT) service. Two PM management schemes are proposed to manage PM information related to UPT users for incoming...

In this paper, a comprehensive model for hub location-routing problem is proposed which no network structure other than connectivity is imposed on backbone (i.e. network between hub nodes) and tributary networks (i.e. networks which connect non-hub nodes to hub nodes). This model is applied in public transportation, telecommunication and banking networks. In this model locating and routing is c...

At the beginning of the seventies, a break-through took place in the telecommunication research. The introduction of Chemical Vapour Deposition technology in the manufacture of optical fibres allowed both technical quality and economical convenience to realise optical networks, thus beginning the telecommunication revolution. Since that moment, a great development of the CVD techniques has been...

Teletraffic phenomenon in classical and new telecommunication networks can be more systematically described and different system-type problems can be effectively solved using fundamental concepts of systems and GSPS (General Systems Problem Solver) methodology. Basic presupposition is that general systems methodology is usable as a logicomathematical methodology in formulation, derivation and e...

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 ...