The design of logical topologies in wavelength-routing multihop optical networks is a well-studied problem. In this paper, we consider logical topology (LT) design over the popular ring and linear topologies. Our objective is the minimization of the electronic processing delay for the worst case traffic flow. For uniform traffic between nodes, this delay minimization corresponds to minimizing t...

Cartan's di®erential topology is used to construct a method for determining if a process applied to a physical system is thermodynamically irreversible.

The current best membrane-protein topology-prediction methods are typically based on sequence statistics and contain hundreds of parameters that are optimized on known topologies of membrane proteins. However, because the insertion of transmembrane helices into the membrane is the outcome of molecular interactions among protein, lipids and water, it should be possible to predict topology by met...

Distributed Hash Tables (DHTs) may suffer from a high lookup latency due to the issue of topology mismatching between the overlay and the physical underlying network. To handle this problem, recently, some researchers use network coordinates (NCs) to construct topology-aware DHTs(e.g. Canary). However, these proposed DHTs still have room to be improved due to the inaccuracy of NCs. To construct...

Mapping virtual process topology to physical processor topology is one of the most important issues in parallel computing. The mapping problem for switch-based cluster systems of irregular topology is very complicated due to the connection irregularity and routing complexity. This paper proposes two mapping schemes for irregular cluster systems, which try to map the nearest neighbors in the pro...

Wireless ad hoc and sensor networks need to deal with unstable links. In practice the link quality between neighboring nodes fluctuates significantly over time. In this paper we evaluate the impact of topology control on routing performance. We propose a dynamic version of the XTC topology control algorithm. This simple and strictly local protocol removes unreliable and redundant links from the...

In most applications of general topology, topology usually is not the first, primary structure, but the information which finally leads to the construction of the certain, for some purpose required topology, is filtered by more or less thick filter of the other mathematical structures. This fact has two main (from the topologist’s point of view mostly negative) consequences: (1) Most important ...

Ethernet topology discovery has gained increasing interest in the recent years. This trend is motivated mostly by increasing number of carrier Ethernet networks as well as the size of these networks, and consequently the increasing sales of these networks. To manage these networks efficiently, detailed and accurate knowledge of their topology is needed. Knowledge of a network's entities and the...

A virtual topology over a wavelength routed WAN consists of clear optical channels between nodes called lightpaths. These carry traffic end-to-end without electronic switching, creating an optical layer of the topology. Virtual topology design aims at combining the best of optical switching and electronic routing abilities. Designing a virtual topology on a physical network consists of deciding...

In this paper, a new circuit is proposed for step-up Z-source inverter based on QZSI (quasi-Z-source inverter). The proposed topology inherits all advantages of the conventional topology. The proposed topology in comparison with conventional topology reduces the ST (Shoot-through) duty cycle by over 25% at the same voltage boost factor. Theoretical analysis of the proposed qZSI in the ST and no...