The paper presents a cloud-based virtual server environment for simulations of MIMO LTE networks at Telecommunications Research Center, Vilnius University. Brief information about analytical models for simulating the performance of mobile wireless network is given including antenna analysis, radio propagation channel and radio interference estimation problems. Architecture of software framework...

Discontent with the traditional network protocol stack architecture has been steadily increasing as new network technologies and applications demand a greater degree of flexibility and “end to end” information than a strictly layered structure permits. Software-defined radio (SDR) systems have prompted some rethinking of the network stack, and schemes have been presented that attempt to take ad...

This research examines an approach to modeling and simulating distributed object computing (DOC) systems as a set of discrete software components mapped onto a set of networked processing nodes. Our overall modeling approach has clearly separated hardware and software components enabling systems level, distributed co-design engineering. The distributed co-design engineering refers to a formal a...

This paper presents a simple simulation model of a firewall to derive several performance metrics and briefly argues on the importance and value of modeling and simulation in courses that study various aspects of perimeter defense in network security. The simulation model mentioned previously is part of an effort by faculty of our department to develop a multi-disciplinary repository of computa...

In a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. In the present study, Backward Deformation Method and FE simulation via ABAQUS software has been used in order to design preform die of the H-shaped parts. In the Backward Deformation Method, the final shape of the part is considered as a starting point and u...

Distributed generation (DG) has been widely used in distribution network to reduce the energy losses, improve voltage profile and system reliability, etc.  The location and capacity of DG units can influence on probability of protection mal-operation in distribution networks. In this paper, a novel model for DG planning is proposed to find the optimum DG location and sizing in radial distr...

The performance analysis of network architectures is a very crucial factor in designing ATM highspeed communications networks. Very often, simulation is the only feasible method because of the nature of the problem and because analytical techniques become too difficult to handle. However simulation can be costly to develop and run. The mathematical analysis approach is preferable but in most ca...