As we increasingly rely on information systems to support a multitude of critical operations, it becomes more and more important that these systems are able to deliver quality of service, even in the face of intrusions. One common class of cyber-attacks is the flooding of the system’s resources with requests for service. Thus, a reliable information system must be able to adeptly handle a large...

This paper presents a mathematical model for an inventory control system in which customers’ demands and suppliers’ service time are considered as stochastic parameters. The proposed problem is solved through queuing theory for a single item. In this case, transitional probabilities are calculated in steady state. Afterward, the model is extended to the case of multi-item inventory systems. The...

Provisioning of quality of service (QoS) is a key issue in visible light communication (VLC) system as well as in other wireless communication systems. Due to the fact that QoS requirements are not as strict for all traffic types, more calls of higher priority traffic classes can be accommodated by blocking some more calls of lower priority traffic classes. Diverse types of high data rate traff...

In this paper, we consider a tandem of two head-of-line (HOL) non-preemptive priority queuing systems, each with a single server and a deterministic service-time. Two classes of traffic are considered, namely high priority and low priority traffic. By means of a generating function approach, we present a technique to derive closed-form expressions for the mean buffer occupancy at each node and ...

Weighted Fair Queuing (WFQ) is a packet scheduling technique that has been proposed and is currently used in modern network routers to provide end-to-end delay and bandwidth guarantees. Unfortunately the scalability of existing WFQ implementation techniques in large-scale backbone routers is relatively poor. Various approximation techniques have been proposed to improve WFQ's scheduling eecienc...

The provisioning of end-to-end services in the presence of trac aggregation is evaluated in the framework of the Di€erentiated Services (di€serv) QoS architecture. The e€ect of stream multiplexing on delay and jitter-sensitive trac is analyzed through an experimental approach. Aggregation is evaluated in three di€erent scenarios: with di€erent aggregate trac loads, with a variable number of ...

Due to high speed Internet and Multimedia applications, future wireless communication are expected to support multimedia traffic such as voice, video and text with a variety of Quality of Service (QoS) requirements and make efficient use of radio resources. Such kind of traffic requires high level of QoS guarantees. Traffic management is a process of regulating the traffic over network. Since, ...