4 research outputs found
Traffic Offered Behaviour Regarding Target QOS Parameters in Network Dimensioning
We consider a model of overall telecommunication network with virtual circuits switching, in stationary
state, with Poisson input flow, repeated calls, limited number of homogeneous terminals and 8 types of losses.
One of the main problems of network dimensioning/redimensioning is estimation of traffic offered in network
because it reflects on finding of necessary number of circuit switching lines on the basis of the consideration of
detailed users manners and target Quality of Service (QoS). In this paper we investigate the behaviour of the
traffic offered in a network regarding QoS variables: “probability of blocked switching” and “probability of finding
B-terminals busy”. Numerical dependencies are shown graphically. A network dimensioning task (NDT) is
formulated, solvability of the NDT and the necessary conditions for analytical solution are researched as well.
International Journal "Information Technologies and Knowledge" Vol.2 / 2008
174
The received results make the network dimensioning/redimensioning, based on QoS requirements easily, due to
clearer understanding of important variables behaviour.
The described approach is applicable directly for every (virtual) circuit switching telecommunication system e.g.
GSM, PSTN, ISDN and BISDN. For packet - switching networks, at various layers, proposed approach may be
used as a comparison basis and when they work in circuit switching mode (e.g. VoIP)
Intelligent Car Parking Locator Service
This paper presents an InfoStation-based multi-agent system facilitating a Car Parking Locator service
provision within a University Campus. The system network architecture is outlined, illustrating its functioning
during the service provision. A detailed description of the Car Parking Locator service is given and the system
entities’ interaction is described. System implementation approaches are also considered
InfoStation-based Adaptable Provision of m Learning Services: Main Scenarios
This paper presents an adaptable InfoStation-based multi-agent system facilitating the mobile
eLearning (mLearning) service provision within a University Campus. A horizontal view of the network
architecture is presented. Main communications scenarios are considered by describing the detailed interaction of
the system entities involved in the mLearning service provision. The mTest service is explored as a practical
example. System implementation approaches are also considered
Context-Aware and Adaptable eLearning Systems
The full text file attached to this record contains a copy of the thesis without the authors publications attached. The list of publications that are attached to the complete thesis can be found on pages 6-7 in the thesis.This thesis proposed solutions to some shortcomings to current eLearning architectures. The proposed DeLC architecture supports context-aware and adaptable provision of eLearning services and electronic content. The architecture is fully distributed and integrates service-oriented development with agent technology. Central to this architecture is that a node is our unit of computation (known as eLearning node) which can have purely service-oriented architecture, agent-oriented architecture or mixed architecture. Three eLeaerning Nodes have been implemented in order to demonstrate the vitality of the DeLC concept. The Mobile eLearning Node uses a three-level communication network, called InfoStations network, supporting mobile service provision. The services, displayed on this node, are to be aware of its context, gather required learning material and adapted to the learner request. This is supported trough a multi-layered hybrid (service- and agent-oriented) architecture whose kernel is implemented as middleware. For testing of the middleware a simulation environment has been developed. In addition, the DeLC development approach is proposed. The second eLearning node has been implemented as Education Portal. The architecture of this node is poorly service-oriented and it adopts a client-server architecture. In the education portal, there are incorporated education services and system services, called engines. The electronic content is kept in Digital Libraries. Furthermore, in order to facilitate content creators in DeLC, the environment Selbo2 was developed. The environment allows for creating new content, editing available content, as well as generating educational units out of preexisting standardized elements. In the last two years, the portal is used in actual education at the Faculty of Mathematics and Informatics, University of Plovdiv. The third eLearning node, known as Agent Village, exhibits a purely agent-oriented architecture. The purpose of this node is to provide intelligent assistance to the services deployed on the Education Pportal. Currently, two kinds of assistants are implemented in the node - eTesting Assistants and Refactoring eLearning Environment (ReLE). A more complex architecture, known as Education Cluster, is presented in this thesis as well. The Education Cluster incorporates two eLearning nodes, namely the Education Portal and the Agent Village. eLearning services and intelligent agents interact in the cluster