We are interested in the performance evaluation of timed event graphs with multipliers. The dynamical equation modelling such graphs are nonlinear in (min,+) algebra. This nonlinearity is due to multipliers and prevents from applying usual performance analysis results. As an alternative, we propose a linearization method in (min,+) algebra of timed event graphs with multipliers. From the obtain...

When considering education, quality of educational service and stakeholder satisfaction can be taken as more important. Most of the performance models are fails to address the evaluation of organizational performance. This study examines the performance of entire management faculties in Sri Lankan Universities and the perception level of management employees about the Balanced Scorecard (BSC). ...

ATM traac is complex but only simple statistical models are amenable to mathematical analysis. We discuss a class of queuing models which is wide enough to provide models which can reeect the features of real traac, but which is simple enough to be analytically tractable, and review the bounds on the queue-length distribution that have been obtained. We use them to obtain bounds on QoS paramete...

Finally I would like to thank my parents and my family for their sacrifices and unconditional support for my study.

In this paper, we consider the potentialities of adapting a 3D deformable face model to video sequences. Two adaptation methods are proposed. The first method computes the adaptation using a locally exhaustive and directed search in the parameter space. The second method decouples the estimation of head and facial feature motion. It computes the 3D head pose by combining: (i) a robust feature-b...

The third-generation mobile communication system is being developed to support to a wide range of services with different bit rates such as data, video as well as voice. We propose an access control scheme based on preemption policy to provide efficiently high priority video services and low priority data services. We analyze the proposed scheme using Markov model and present the performance ev...

Following the idea of “what you measure is what you get,” this paper discusses the necessity to improve managing and planning firms’ service based on performance evaluation, The Balanced Scorecard (BSC) has been used as a tool for suggesting measures that can evaluate performance of a company by considering both financial and non-financial perspectives. The current BSC technology does not provi...

Most approaches to detection and classification of human activity deal with observing individual persons. However, people often tend to organize into groups to achieve certain goals, and human activity is sometimes more readily defined and observed in the context of whole group, where the activity is coordinated among its members. An excellent example of this are team sports, which can provide ...

Simulation studies of Grid scheduling strategies require representative workloads to produce dependable results. Real production Grid workloads have shown diverse correlation structures and scaling behavior, which are different to the characteristics of the available supercomputer workloads and cannot be captured by Poisson or simple distribution-based models. We present statistical models that...

Performance evaluation via retrospective data is essential to the development of recommender systems. However, it is necessary to ensure that the evaluation results are representative of live, interactive behaviour. We present a case study of several common evaluation strategies applied to data from a live intervention. The intervention is designed as a case-control experiment applied to two co...