In this paper we study two echelon multi-server tandom queueing systems where customers arrive according to a poisson process with two different rates. The service rates at both echelons are independent of each other. The service times of customers is assumed to be completed in two stages. The service times at each stage are exponentially distributed. At the first stage, the customers may balk ...

The E-healthcare system has a complex architecture, diverse business types, and sensitive data security. To meet the secure communication access control requirements in user–medical server, user–patient, patient–medical other scenarios system, efficient authenticated key agreement authorization scheme need to be studied. However, existing multi-server solutions do not consider authentication of...

Nowadays, the overwhelming majority of password-authenticated key agreement protocols using chaotic maps are based on three architectures (client/server, two clients/server and multi-server) and four security models (heuristic security, random oracle, ideal cipher and standard model). However, with rapid changes in the modern communication environment such as wireless mesh networks and cloud st...

School of Mathematics and Statistics, Wuhan University, Wuhan, People’s Republic of China Email: [email protected] Abstract: Recently, Tsaur et al. proposed an authentication scheme for multi-server environments and claimed their scheme could withstand various attacks. In this letter, we will point out that Tsaur et al. scheme is not suitable for multi-server environments since the user ...

Scheduling policies in multi-queue multi-server systems need to allocate servers based on the channel state information and the queue state information. In the downlink, channel state information available to the scheduler may be imperfect due to feedback delay and estimation errors. Motivated by this, we consider the downlink scheduling problem of allocating servers to multi-queue multi-server...

Server-centric data center architecture has been proposed to provide high throughput, scalable construction and error tolerance with commodity servers and switches for cloud data centers. To fully utilize those advantages of servercentric data center, an effective routing algorithm to find high quality multiple paths in Server-centric network is needed. However, current routing algorithms canno...

Multi-server architecture is very popular in Distributed Virtual Environments. Although multi-server architecture has good scalability, the load balance and consistency are still challenging issues. Because of server resource limitations (computation, communication etc), the consistency of the virtual world cannot be guaranteed sometimes. In this paper, we address this problem by developing sch...

Smart Parking is essential for any future smart cities due to the tremendous growth of car fleet. Such infrastructures require a certain amount equipment. Indeed, parking integrates lot actors, manage its equipment must be managed accordingly. Here, proposed distributed architecture them by collecting efficiently their data. Two types data relating collected: those coming from deployed in and i...

SuperCollider [5] is a computer music system based on an object-oriented real-time scripting language and a separate audio synthesis server. The synthesis server is programmed using a sequential programming model and is only able to use one CPU core for audio synthesis, so it does not make full use of today’s multi-core CPUs. In order to overcome this limitation we have implemented Supernova, a...

This paper presents the design of a new Web server architecture called the asymmetric multi process event driven AMPED architecture and evaluates the performance of an implementation of this architecture the Flash Web server The Flash Web server combines the high performance of single process event driven servers on cached workloads with the performance of multi process and multi threaded serve...