Results 211 to 220 of about 108,306 (265)

Elastic Optical Network Spectrum Fragmentation Algorithm

2018 IEEE International Conference on Computer and Communication Engineering Technology (CCET), 2018
Aiming at spectrum allocation problem in elastic optical networks, a spectrum allocation method that combines the advantages of genetic algorithm and ant colony algorithm is proposed. This method uses genetic algorithm to generate the initial solution with rapid random population global search ability. Then the initial solution of the genetic algorithm
Zhao Biyou, Yuan Jianan, Zhang Yanling, Yifan Wen   +3 more
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Resonant Multiphoton Fragmentation Spectrum of Niobium Dimer Cation

The Journal of Physical Chemistry A, 2009
Resonant multiphoton fragmentation spectra of niobium dimer cation (Nb2(+)) have been obtained by utilizing laser vaporization of a Nb metal target. Ions are mass-selected with a time-of-flight mass spectrometer followed by a mass gate and then fragmented with a pulsed dye laser, and the resulting fragment ions are detected with a second time-of-flight
Aydin, M., Lornbardi, John R.
openaire   +3 more sources

Core and Spectrum Allocation for Avoidance of Spectrum Fragmentation in EON-SDM

ICC 2020 - 2020 IEEE International Conference on Communications (ICC), 2020
In Elastic Optical Networks with Space-Division Multiplexing (EON-SDM), dynamic allocation and deallocation of the spectrum can cause spectrum fragmentation. A possible solution is the use of proactive techniques to reduce the occurrence of fragmentation. In this paper, we propose a proactive algorithm for EON-SDM networks using Multi-Core Fibers (MCFs)
Silvana Trindade, Nelson L. S. da Fonseca   +1 more
openaire   +1 more source

Fragmentation aware routing and spectrum assignment algorithm

2014 IEEE International Conference on Communications (ICC), 2014
In flex-grid (elastic) networks, the spectrum can be allocated at a much finer granularity than it can be allocated in WDM networks. However, the dynamic establishment and tear down of lightpaths yields to the fragmentation of the spectrum with consequent increase in blocking of requests for connection establishment.
Pedro M. Moura, Nelson L. S. da Fonseca, Rafael A. Scaraficci   +2 more
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Spectrum Fragmentation Management in Elastic Optical Networks

2019 21st International Conference on Transparent Optical Networks (ICTON), 2019
In elastic optical networks (EONs), bandwidth fragmentation is a challenging issue, which need to be suppressed to improve the traffic admissibility. In EONs, lightpaths are established and released dynamically, which cause bandwidth fragmentation that occurs when unoccupied isolated slots are not aligned along the route and contiguous in the spectrum.
Eiji Oki, Takehiro Sato, Bijoy Chand Chatterjee   +2 more
openaire   +1 more source

Structural Similarity and IR Spectrum Modeling Using the Spectrum–Fragment Composition Database

Journal of Structural Chemistry, 2002
It is shown on numerous examples that IR spectra of organic compounds may be modeled by using the spectra of the structural analogs selected from the database. This paper presents a technique for model construction and the results of modeling along with some examples of model and experimental spectra.
V. N. Piottukh-Peletskii, K. S. Chmutina, M. V. Korolevich, R. G. Zhbankov, B. G. Derendyaev   +4 more
openaire   +1 more source

A Penalty-Based Routing and Spectrum Assignment in Fragmented Elastic Optical Network Spectrum

2021 National Conference on Communications (NCC), 2021
Routing and spectrum assignment (RSA) has been an area of keen interest in Elastic Optical Networks (EONs). Improper resource provisioning causes fragmentation in the network spectrum, which leads to inefficient spectrum utilization. It also causes an increase in blocking of the new connection requests.
Anjali Sharma, Sobir Ali, Varsha Lohani, Yatindra Nath Singh   +3 more
openaire   +1 more source

The study on spectrum/channel fragmentation from dynamic spectrum aggregation in CRNs

2014 European Conference on Networks and Communications (EuCNC), 2014
We study the dynamic spectrum aggregation and allocation problem in cognitive radio networks (CRNs). When the available spectrum is fragmented and the bandwidth of the spectrum holes is narrow, spectrum aggregation can be a solution to use multiple holes.
Haeyoung Lee, Seiamak Vahid, Klaus Moessner   +2 more
openaire   +1 more source

Addressing Spectrum Fragmentation in Flexible Grid Optical Networks

Asia Communications and Photonics Conference 2013, 2013
Spectrum fragmentation is an intrinsic issue in flexible grid optical networks and requires systematic countermeasures. This paper describes measures for fragmentation minimization, metrics for fragmentation assessment, and techniques for hitless defragmentation.
Xi Wang, Qiong Zhang, Inwoong Kim, Paparao Palacharla, Motoyoshi Sekiya, Kyosuke Sone, Yasuhiko Aoki   +6 more
openaire   +1 more source