Network Functions Virtualization facilitates the automation of scaling softwarized network services (SNSs). However, realization such a scenario requires way to determine needed amount resources so that SNSs performance requisites are met for given workload. This problem is known as resource dimensioning, and it can be efficiently tackled by modeling. In this vein, paper describes an analytical...

This paper presents a set of simulation studies for comparing the performance of several flow-based scheduling algorithms, namely Weighted Fair Queuing, Self-Clock Fair Queuing, Start-Time Fair Queuing, Virtual Clock, Worst-case Fair Weighted Fair Queuing and Worstcase Fair Weighted Fair Queuing-plus. These algorithms are being considered for IP networks supporting Quality of Service (QoS).

This paper presents one of the features of DS (Differentiated Services) architecture, namely the queuing or congestion management. Packets can be placed into separate buffer queues, on the basis of the DS value. Several forwarding policies can be used to favor high priority packets in different ways. The major reason for queuing is that the router must hold the packet in its memory while the ou...

This is a personal account of an unusual career in OR. I am both a researcher and a practitioner. Each of these aspects of me has benefited greatly from the other. In spite of my limited mathematical skills, over the years I have been able to contribute OR theory I am proud of. This paper is a largely collection stories about the ideas I have contributed and their often practical sources. The s...

In parliaments elected by proportional systems the seats are allocated to the political parties roughly proportionally to the shares of votes for the party lists obtained in elections. Assuming that members of the parliament representing the same party are voting together, it has sense to require that distribution of the influence of the parties in parliamentary decision making is proportional ...

In the present communication, we have studied different variations in the entropy measures in the different states of queueing processes. In case of steady state queuing process, it has been shown that as the arrival rate increases, the uncertainty increases whereas in the case of non-steady birth-death process, it is shown that the uncertainty varies differently. In this pattern, it first incr...

Most existing organizational design processes focus on either the qualitative or domain-independent features of candidate designs. This paper demonstrates the significance of domain-specific features through an examination of an organizationally-driven information retrieval network. The behavior of a search process for appropriate agents and the consequences of hierarchical control in a continu...

The mathematical model of an two-phases-service M/M/1/N queuing system with the server breakdown and multiple vacations was realized and established in the Graduate Employment Services system. Secondly, equations of steady-state probability were derived by applying the Markov process theory. Then, we obtained matrix form solution of steady-state probability by using blocked matrix method. Final...

Modern healthcare achieved great progress in developing and manufacturing medical devices, treatment procedures and drugs to serve individual patients. However, relatively little technical talent and material resources have been devoted to improving the overall health care delivery process as a system. Discrete-event simulation (DES) models and queuing analytic (QA) theory are the most widely a...