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Congestion presents a significant challenge in ad hoc networks due to their unstructured and distributed nature. In most congestion detection schemes for such networks, the affected node itself detects whether it is congested or not. The detection approach proposed in this paper performs detection with information estimators from neighbouring uncongested nodes that may be able to relieve the congestion...
Software-defined networking (SDN) empowers network operators with more flexibility to program their networks. With SDN, network management moves from codifying functionality in terms of low-level device configurations to building virtualized software entities that facilitate network management and debugging. By separating the complexity of state distribution from network specification, SDN provides...
This paper proposes a consistent and computationally efficient FFT-based algorithm for inferring the network topology where each node in the network is associated to a wide-sense stationary, ergodic, Gaussian process. Each edge of the tree network is characterized by a linear, time-invariant dynamical system and additive white Gaussian noise. The proposed algorithm uses Bartlett's procedure to produce...
This paper provides a symbolic dynamics perspective to Chua's topologically-distinct complex Bernoulli-shift rules 18, 122, 126 and 146. Through this work, a rigorous analysis of their global attractors is conducted in the space of bi-infinite symbolic sequences. Based on the concepts of blocking transformation and releasing transformation, their chaotic dynamics is further uncovered, including topological...
In this paper we propose a new algorithmic approach to achieve fault tolerance based on three dimensional cellular genetic algorithms (3D-cGAs). Herein, 3D architecture is targeted due to its amenability to implementation with current advanced custom silicon chip technology. The proposed approach is designed to exploit the inherent features of a cGA in which the genetic diversity is used as the key...
Robustness is a key concern when developing a successful commercial evolutionary tool. In this paper we investigate the performance of Cultural Algorithms over the complete range of system complexities, from fixed to chaotic. In order to apply the Cultural Algorithm over all complexity classes we generalize on its co-evolutionary nature to keep the variation in the population across all complexities...
This paper presents a novel two-dimensional DGW structure (2D_PPCT). Then a new encoding scheme is proposed, which combines permutation encoding and 2D_PPCT. Experiment shows that the new scheme not only makes full use of the structural advantages of PPCT but has high coding efficiency of permutation encoding.
In this paper, the dynamical behaviors of elementary cellular automata (ECA) rule 35 are studied from the viewpoint of symbolic dynamics. It is proved that rule 35, a member of Wolfram's class II, possesses rich and complicated dynamical behaviors in its two subsystems; that is, rule 35 is topologically mixing and possesses the positive topological entropy on each subsystem. Meanwhile, the phenomena...
A novel two-dimensional IPPCT (2D_IPPCT) and a multi-dimensional IPPCT (MD_IPPCT) are presented in this paper. 2D_IPPCT structure has greater data rate. It is proved that under the circumstances of the same number of leaf nodes, the data rate of MD_IPPCT will increase to a limit with dimension number n increasing and this limit is also computed. Moreover, we prove that there exists a two dimensional...
The present work explores the formal evolutionary development of complex thermal physical systems using a bio-inspired evolutionary method. The bio-inspired method consists of Lindenmayer systems (L-systems) with its turtle interpretation for the modeling of the complex dendritic structures, the finite element method for the analysis of the structure and an evolutionary algorithm to evolve the topology...
Under the influence of the lighting condition and some character of water media, the underwater images have low contrast, unbalance gray scales, fuzzy edge of objects and large quantity of noise which will appear with the movement of vehicle. For the mentioned above factors, when traditional methods are used to dispose underwater images, the regions of objects can’t be located exactly, details of...
Let d = d(n) be the minimum d such that for every sequence of n subsets F1, F2, . . . , Fn of {1, 2, . . . , n} there exist n points P1, P2, . . . , Pn and n hyperplanes H1, H2 .... , Hn in Rd such that Pj lies in the positive side of Hi iff j ∈ Fi. Then n/32 ≤ d(n) ≤ (1/2 + 0(1)) ?? n. This implies that the probabilistic unbounded-error 2-way complexity of almost all the Boolean functions of 2p variables...
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