2,604 research outputs found
Network Capacity Bound for Personalized PageRank in Multimodal Networks
In a former paper the concept of Bipartite PageRank was introduced and a
theorem on the limit of authority flowing between nodes for personalized
PageRank has been generalized. In this paper we want to extend those results to
multimodal networks. In particular we introduce a hypergraph type that may be
used for describing multimodal network where a hyperlink connects nodes from
each of the modalities. We introduce a generalisation of PageRank for such
graphs and define the respective random walk model that can be used for
computations. we finally state and prove theorems on the limit of outflow of
authority for cases where individual modalities have identical and distinct
damping factors.Comment: 28 pages. arXiv admin note: text overlap with arXiv:1702.0373
Visualisation and ordering of many-objective populations
Copyright © 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.We introduce novel methods of visualising and ordering multi-and many-objective populations. We compare individuals by the probability that one will beat another in a tournament on a randomly selected objective. This defines a weighted directed graph representing the population. We introduce a novel graphical representation of the many objective population based on Pareto shells. We examine leagues, Pareto shells, preference ordering, average rank, outflow, the stationary distribution and the power index for ordering the population finding that the average rank is equivalent to outflow and that these together with the power index are generally superior. Finally, we show how to seriate objectives to enhance the interpretability of heatmap visualisations
Interactions between financial and environmental networks in OECD countries
We analyse a multiplex of networks between OECD countries during the decade
2002-2010, which consists of five financial layers, given by foreign direct
investment, equity securities, short-term, long-term and total debt securities,
and five environmental layers, given by emissions of N O x, P M 10 SO 2, CO 2
equivalent and the water footprint associated with international trade. We
present a new measure of cross-layer correlations between flows in different
layers based on reciprocity. For the assessment of results, we implement a null
model for this measure based on the exponential random graph theory. We find
that short-term financial flows are more correlated with environmental flows
than long-term investments. Moreover, the correlations between reverse
financial and environmental flows (i.e. flows of different layers going in
opposite directions) are generally stronger than correlations between synergic
flows (flows going in the same direction). This suggests a trade-off between
financial and environmental layers, where, more financialised countries display
higher correlations between outgoing financial flows and incoming environmental
flows from lower financialised countries, which could have important policy
implications. Five countries are identified as hubs in this finance-environment
multiplex: The United States, France, Germany, Belgium-Luxembourg and the
United Kingdom.Comment: Supplementary Information provide
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