First of all, in this paper, the topology and operation of the three-phase three-level Z-source inverter based on neutral-point-clamped (Z-NPC) are studied. Moreover, different combinations of permissible switching states and control signals are explained for this inverter. In this paper, the topology of the three-phase three-level Z-NPC inverter is extended for an n-level state. Also, a combin...

Topology control protocols attempt to reduce the energy consumption of nodes in an ad-hoc wireless network while maintaining sufficient network connectivity. Topology control protocols with various features have been proposed, but they all lack robustness and are extremely sensitive to faulty information from neighbors. For example, the XTC protocol (R. Wattenhofer and A. Zollinger, XTC: A prac...

The concept of ad-hoc networks has first arisen in 1970s. Adhoc networks act differently than other wireless networks, for each node can act as a router. For that ad-hoc networks can be used in some interesting applications. However, if the network wasn’t well constructed, it would have an inefficient performance. Interference can be considered to be one of the worst problems, the network can s...

This paper presents design and simulation of a low cost and low false alarm rate method for improved cyber-state awareness of critical control systems the Known Secure Sensor Measurements (KSSM) method. The KSSM concept relies on physical measurements to detect malicious falsification of the control systems state. The KSSM method can be incrementally integrated with already installed control sy...

Abs t rac t We define, for an overlay built on top of an ad hoc network, a simple criterion for neighbourhood: two overlay nodes are neighbours if and only if there exists a path between them of at most R hops, and R is called the (overlay) neighbourhood range. A small R may result in a disconnected overlay, while an unnecessarily large R would generate extra control traffic. We are interested ...

Freenet, a fully decentralized publication system designed for censorship-resistant communication, exhibits long delays and low success rates for finding and retrieving content. In order to improve its performance, an in-depth understanding of the deployed system is required. Therefore, we performed an extensive measurement study accompanied by a code analysis to identify bottlenecks of the exi...

This paper analyzes fast adaptive traffic engineering from a feedback control perspective. We provide a model that characterizes the system parameters’ effects on the performance of the dynamic routing system. This allows quantitative analysis of adaptive traffic engineering control laws and its design parameter choices. We then specialize the general framework in two representative network top...

This chapter surveys network-level approaches to conserve energy in sensor networks. We consider protocols for transmission power control, media access control, topology control, and energy-aware routing, surveying relevant literature and describing approaches that have been considered.