2,624 research outputs found
Joint measurability meets Birkhoff-von Neumann's theorem
Quantum measurements can be interpreted as a generalisation of probability
vectors, in which non-negative real numbers are replaced by positive
semi-definite operators. We extrapolate this analogy to define a generalisation
of doubly stochastic matrices that we call doubly normalised tensors (DNTs),
and formulate a corresponding version of Birkhoff-von Neumann's theorem, which
states that permutations are the extremal points of the set of doubly
stochastic matrices. We prove that joint measurability arises as a mathematical
feature of DNTs in this context, needed to establish a characterisation similar
to Birkhoff-von Neumann's. Conversely, we also show that DNTs emerge naturally
from a particular instance of a joint measurability problem, remarking its
relevance in general operator theory.Comment: 6 pages, two columns. v3: improved presentatio
Exploring Text Virality in Social Networks
This paper aims to shed some light on the concept of virality - especially in
social networks - and to provide new insights on its structure. We argue that:
(a) virality is a phenomenon strictly connected to the nature of the content
being spread, rather than to the influencers who spread it, (b) virality is a
phenomenon with many facets, i.e. under this generic term several different
effects of persuasive communication are comprised and they only partially
overlap. To give ground to our claims, we provide initial experiments in a
machine learning framework to show how various aspects of virality can be
independently predicted according to content features
Echoes of Persuasion: The Effect of Euphony in Persuasive Communication
While the effect of various lexical, syntactic, semantic and stylistic
features have been addressed in persuasive language from a computational point
of view, the persuasive effect of phonetics has received little attention. By
modeling a notion of euphony and analyzing four datasets comprising persuasive
and non-persuasive sentences in different domains (political speeches, movie
quotes, slogans and tweets), we explore the impact of sounds on different forms
of persuasiveness. We conduct a series of analyses and prediction experiments
within and across datasets. Our results highlight the positive role of phonetic
devices on persuasion
Exploring Image Virality in Google Plus
Reactions to posts in an online social network show different dynamics
depending on several textual features of the corresponding content. Do similar
dynamics exist when images are posted? Exploiting a novel dataset of posts,
gathered from the most popular Google+ users, we try to give an answer to such
a question. We describe several virality phenomena that emerge when taking into
account visual characteristics of images (such as orientation, mean saturation,
etc.). We also provide hypotheses and potential explanations for the dynamics
behind them, and include cases for which common-sense expectations do not hold
true in our experiments.Comment: 8 pages, 8 figures. IEEE/ASE SocialCom 201
Do Linguistic Style and Readability of Scientific Abstracts affect their Virality?
Reactions to textual content posted in an online social network show
different dynamics depending on the linguistic style and readability of the
submitted content. Do similar dynamics exist for responses to scientific
articles? Our intuition, supported by previous research, suggests that the
success of a scientific article depends on its content, rather than on its
linguistic style. In this article, we examine a corpus of scientific abstracts
and three forms of associated reactions: article downloads, citations, and
bookmarks. Through a class-based psycholinguistic analysis and readability
indices tests, we show that certain stylistic and readability features of
abstracts clearly concur in determining the success and viral capability of a
scientific article.Comment: Proceedings of the Sixth International AAAI Conference on Weblogs and
Social Media (ICWSM 2012), 4-8 June 2012, Dublin, Irelan
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