Much of the recent research has been aimed at improving web performance and scalability. For attaining the goal of improving web performance the basic need is the understanding of WWW work loads. In this paper we present a method useful for the system engineer to improve the service performance of a Web server through session-based Web workload, the best indicator of the users perception of the...

In this paper a novel approach for physics simulation prediction is proposed with applications in graphics rendering and multimedia. A prediction mechanism is introduced based on regression that aims to reduce the computational cost of simulations in a given scene by negating the need to perform physics calculations every frame. Novel features based on the energy of a scene over time are sugges...

Classifier combination is known to generally perform better than each individual classifier by taking into account the complementarity between the input pieces of information. Dempster-Shafer theory is a framework of interest to make such a fusion at the decision level, and allows in addition to handle the conflict that can exist between the classifiers as well as the uncertainty that remains o...

When su cient computing power is available dy namic simulation can be used as a source of mo tion for real time interactive virtual environments In this paper we explore techniques for reducing the computational cost of simulating groups of crea tures by using less accurate simulations for individ uals when they are less important to the viewer or to the action in the virtual world The less acc...

In an ad hoc network, all communication is done over wireless media, typically by radio through the air, without the help of wired base stations. Since direct communication is allowed only between adjacent nodes, distant nodes communicate over multiple hops. The quality-of-service (QoS) routing in an ad hoc network is difficult because the network topology may change constantly, and the availab...

The dependence of the current and power efficiencies of bi-layer organic light-emitting diodes (OLEDs) on the thickness of the constituent organic layers is reported. The thickness of the electron and hole transport layers was simultaneously varied to determine the optimal configuration for power efficiency. It was verified that the inclusion of a suitable electrode buffer layer reduced the eff...

—Recently, Small Base Stations (SBSs) are added to macro-cell layout to extend network coverage and increase system capacity. Whereas, most of the users incline to connect to Macro Base Stations (MBSs) due to their overwhelmingly higher transmit power. As a result, the imbalanced distribution of load leads to the underutilization of the resources of SBSs, which may deteriorate the network perf...

Software agents can be useful in forming buyers’ groups since humans have considerable difficulties in finding Pareto-optimal deals (no buyer can be better without another being worse) in negotiation situations. What are the computational and economical performances of software agents for a group buying problem? We have developed a negotiation protocol for software agents which we have evaluate...

We discuss the feasibility of simplified Two-Ray Ground path loss models, which are frequently used in simulationbased performance evaluation of Inter-Vehicle Communication (IVC) protocols. We first show that these models are of no benefit compared to the basic Freespace model. As an alternative, we propose a more exact Two-Ray Interference model. We substantiate this claim based on an extensiv...

In this paper, it is proposed that to achieve higher data rates and to combat to effect of multipath propagation, orthogonal frequency division multiplexing system (OFDM) is a promising technique. OFDM allows many users to transmit in an allocated carrier. Each user is allocated several carriers in which to transmit their data.The transmission is generated in such a way that the carriers used a...