Power-Aware Logical Topology Design Heuristics in Wavelength-Routing Networks

Abstract—Wavelength-Routing (WR) networks are the most common solution for core networks. With the access segment moving from copper to Passive Optical Networks (PON), core networks will become one of the major culprits of Internet power consumption. However, WR networks offer some design flexibility which can be exploited to mitigate their energy requirements. One of the main steps which has to be faced in designing WR networks is the planning of the Logical Topology (LT) starting from the matrix of traffic requests. In this paper, we propose a Mixed Integer Linear Programming (MILP) formulation to find power-wise optimal LTs. In addition, due to the complexity of the MILP approach we propose a greedy heuristic and a genetic algorithm (GA) ensuring performance close to the one achieved by the MILP formulation. I

Energy-Efficient Design of Wavelength-Routing Networks

We discuss the power-aware Logical Topology Design problem in wavelength routing net- works, and analyze the economical impacts of power-efficiency. Results show that energy-optimized logical topologies can bring significant economical saving

Optical interconnection networks based on microring resonators

Optical microring resonators can be integrated on a chip to perform switching operations directly in the optical domain. Thus they become a building block to create switching elements in on-chip optical interconnection networks, which promise to overcome some of the limitations of current electronic networks. However, the peculiar asymmetric power losses of microring resonators impose new constraints on the design and control of on-chip optical networks. In this work, we study the design of multistage interconnection networks optimized for a particular metric that we name the degradation index, which characterizes the asymmetric behavior of microrings. We also propose a routing control algorithm to maximize the overall throughput, considering the maximum allowed degradation index as a constrain

Optical Technologies Can Improve the Energy Efficiency of Networks

Abstract Optical technologies, in comparison with electronic technologies, need less power to switch high bitrates and to interconnect farther subsystems. The paper discusses with specific examples how optics can improve the energy efficiency of networks and switches

Antibacterial composite based on nanostructured ZnO mesoscale particles and a poly(vinyl chloride) matrix

The microwave-assisted solvothermal synthesis of inorganic ZnO nanoparticles is a facile method yielding a broad variety of active fillers with specific properties. The synthesis of hierarchical nanostructured zinc oxide mesoscale particles was carried out under continuous microwave irradiation from soluble zinc acetate as the precursor in a diethylene glycol solvent. The prepared ZnO particles were characterized with X-ray diffractometry, scanning electron microscopy and UV-VIS spectrometry. A composite was obtained by mixing these particles with the softened medical-grade poly(vinyl chloride) as a model polymer matrix to develop an antibacterial polymer system with a possible application for plastic medical devices. The testing of the antibacterial activity of the composite confirmed an excellent performance against Escherichia coli (gram-negative) and sufficient activity against Staphylococcus aureus (gram-positive) bacteria according to ISO 22196: 2007. In addition, no adverse effects of the filler on the mechanical properties of the composite were observed in comparison with the neat PVC resin. Therefore, the prepared composites can be considered as suitable candidates for application in plastic medical devices and other industries.TBU in Zlin [IGA/FT/2013/026]; European Regional Development Fund (ERDF); national budget of the Czech Republic, within the Centre of Polymer Systems project [CZ.1.05/2.1.00/03.0111]; European Social Fund (ESF); national budget of the Czech Republic, within the Advanced Theoretical and Experimental Studies of Polymer Systems project [CZ.1.07/2.3.00/20.0104