We study numerically how the intercellular conductance affects the process of spiral breakup in an array of coupled excitable cells. The cell dynamics are described by the Aliev-Panfilov model, and the intercellular connection is made via Ohmic elements. We find that decreasing intercellular conductance can prevent the breaking up of a spiral wave into a complex spatiotemporal pattern. We study...

We propose a new scheduling policy, called SCED (Service Curve-based Earliest Deadline rst), which provides guarantees to virtual circuits in packet-switched networks. This scheduling policy is developed for a general framework for service provisioning based on Service Curves proposed by Cruz. Instead of explicitly guaranteeing a speciic quality of service measure, such as maximum delay, SCED g...

Femtocells can offload macrocells and reduce a cost of transmitted data in wireless networks. If a connection via the femtocell is of a lower cost than via the macrocell, a time spent by users connected to the femtocells should be maximized. This leads to a reduction of the overall cost of user’s connection. Besides, a prolongation of the time spent by users in the femtocells reduces load of th...

In this paper, we examine the fundamental relationship among quality of service, connection cost and traac smoothing in VBR video transmissions. In particular, we discuss how traac smoothing can help improving the quality of service and(or) reducing the network cost for a VBR video session. For this purpose, we present an eeective and eecient traac smoothing technique called the \minimum polyli...

In this paper, we propose a new dynamic resource allocation and call admission control method for the VBR video sources to meet the user’s quality of service requirements and at the same time to achieve an efficient resource management in networks. Without any prior knowledge of the user’s traffic statistics, the proposed mechanism dynamically adjusts the necessary bandwidth by the networks bas...

Quality issues and their connection with structural aspects of process models have been recently studied, but there is still a notable lack of research into quality aspects of activity labels in business process models. In this paper, we investigate whether the guideline to use verb-object labels actually contributes to improved model quality in terms of less ambiguity and higher usefulness. In...

The resource allocation in the Broadband Integrated Services Digital Network (B-ISDN) can be based in an overall network performance function described in this paper and named quality of operation. The quality of operation function is determined itself by bandwidth and quality of service functions. The traffic patterns of the quality of service for each call are predicted by neural networks. Th...