IEEE 802.16 is yet a very recent technology and released hardware does frequently only support standards partially. The same applies to public available simulation tools, in particular for NS-2. As the latter is the de-facto standard in science and as we use it for our research in the context of the WEIRD project, we evaluate the IEEE 802.16 support for NS-2. We present several general but also...

–As the integration density and complexity of the system-on-Chip (SOC) increases, the conventional interconnects are not suitable to fulfil the demands. The application of traditional network technologies in the form of Network-on-Chip is a possible solution. NoC design space has numerous variables. As an improved topology is selected complexities decrease and power-efficiency increases. In thi...

With rapid growth of Internet traffic, much effort has been focused on possible QoS provisioning mechanisms for different types of services. Many mechanisms, such as MultiServ and Virtual Time Reference System, have been proposed to provide QoS guarantees but scalability remains a challenging problem. In this paper, a novel Distributed-FDPS algorithm is proposed to remove the flow state and its...

We enhance the standard ns-2 model for IEEE 802.11 WLANs such that it reflects the delays that are measured in a real ad-hoc network composed of laptops. From timestamps for UDP transmissions, which are recorded at several points on the way from application layer to application layer in a lowly-loaded system, we derive various empirical distributions, which we incorporate into the ns-2 model in...

Maintenance Access Hatches are used to ensure urban safety and aesthetics while facilitating the management of power lines, telecommunication lines, and gas pipes. Such facilities necessitate affordable and effective surveillance. In this paper, we propose a FiCHS (Fixed Cluster head centralized Hierarchical Static clustering) routing protocol that is suitable for underground maintenance hatche...

This article presents IDEA1, a SystemC-based system-level design and simulation framework for WSNs. It allows the performance evaluation (e.g., packet delivery rate, transmission latency and energy consumption) at high level, but with elaborate models of the hardware and software of sensor nodes. Many hardware components are modeled and the IEEE 802.15.4 standard is implemented. IDEA1 uses a cl...

We study stability, accuracy and efficiency of algorithms for a new regularization of the NSE, the NS-ω model (in which the vorticity term, ω = ∇× u, is averaged) given by ut − u× (∇× u) +∇q − ν∆u = f,∇ · u = 0. This is similar to the NS-alpha model (in which the nonlinear term is u × ∇ × u), but the small difference opens attractive algorithmic possibilities. We give tests both confirming the ...