1,452 research outputs found
Recommended from our members
A clash of cultures: The integration of user-generated content within professional journalistic frameworks at British newspaper websites
This study examines how national UK newspaper websites are integrating user-generated content (UGC). A survey quantifying the adoption of UGC by mainstream news organisations showed a dramatic increase in the opportunities for contributions from readers. In-depth interviews with senior news executives revealed this expansion is taking place despite residual doubts about the editorial and commercial value of material from the public. The study identified a shift towards the use of moderation due to editors’ persistent concerns about reputation, trust, and legal liabilities, indicating that UK newspaper websites are adopting a traditional gate-keeping role towards UGC. The findings suggest a gate-keeping approach may offer a model for the integration of UGC, with professional news organisations providing editorial structures to bring different voices into their news reporting, filtering and aggregating UGC in ways they believe to be useful and valuable to their audience. While this research looked at UGC initiatives in the context of the UK newspaper industry, it has broad relevance as professional journalists tend to share a similar set of norms. The British experience offers valuable lessons for news executives making their first forays into this area and for academics studying the field of participatory journalism
Field evidence of social influence in the expression of political preferences: the case of secessionist flags in Barcelona
Different models of social influence have explored the dynamics of social
contagion, imitation, and diffusion of different types of traits, opinions, and
conducts. However, few behavioral data indicating social influence dynamics
have been obtained from direct observation in `natural' social contexts. The
present research provides that kind of evidence in the case of the public
expression of political preferences in the city of Barcelona, where thousands
of citizens supporting the secession of Catalonia from Spain have placed a
Catalan flag in their balconies. We present two different studies. 1) In July
2013 we registered the number of flags in 26% of the the city. We find that
there is a large dispersion in the density of flags in districts with similar
density of pro-independence voters. However, we find that the density of flags
tends to be fostered in those electoral district where there is a clear
majority of pro-independence vote, while it is inhibited in the opposite cases.
2) During 17 days around Catalonia's 2013 National Holiday we observed the
position at balcony resolution of the flags displayed in the facades of 82
blocks. We compare the clustering of flags on the facades observed each day to
equivalent random distributions and find that successive hangings of flags are
not independent events but that a local influence mechanism is favoring their
clustering. We also find that except for the National Holiday day the density
of flags tends to be fostered in those facades where there is a clear majority
of pro-independence vote.Comment: 27 pages, 13 figures, 2 table
A bifibrational reconstruction of Lawvere's presheaf hyperdoctrine
Combining insights from the study of type refinement systems and of monoidal
closed chiralities, we show how to reconstruct Lawvere's hyperdoctrine of
presheaves using a full and faithful embedding into a monoidal closed
bifibration living now over the compact closed category of small categories and
distributors. Besides revealing dualities which are not immediately apparent in
the traditional presentation of the presheaf hyperdoctrine, this reconstruction
leads us to an axiomatic treatment of directed equality predicates (modelled by
hom presheaves), realizing a vision initially set out by Lawvere (1970). It
also leads to a simple calculus of string diagrams (representing presheaves)
that is highly reminiscent of C. S. Peirce's existential graphs for predicate
logic, refining an earlier interpretation of existential graphs in terms of
Boolean hyperdoctrines by Brady and Trimble. Finally, we illustrate how this
work extends to a bifibrational setting a number of fundamental ideas of linear
logic.Comment: Identical to the final version of the paper as appears in proceedings
of LICS 2016, formatted for on-screen readin
Fibrational induction meets effects
This paper provides several induction rules that can be used to prove properties of effectful data types. Our results are semantic in nature and build upon Hermida and Jacobs’ fibrational formulation of induction for polynomial data types and its extension to all inductive data types by Ghani, Johann, and Fumex. An effectful data type μ(TF) is built from a functor F that describes data, and a monad T that computes effects. Our main contribution is to derive induction rules that are generic over all functors F and monads T such that μ(TF) exists. Along the way, we also derive a principle of definition by structural recursion for effectful data types that is similarly generic. Our induction rule is also generic over the kinds of properties to be proved: like the work on which we build, we work in a general fibrational setting and so can accommodate very general notions of properties, rather than just those of particular syntactic forms. We give examples exploiting the generality of our results, and show how our results specialize to those in the literature, particularly those of Filinski and Støvring
Mesoporous Functionalized Acid Catalysts And Their Use As Environmentally Friendly Catalysts In Esterification Of Glycerols For Monoglyceride Production.
Monoglycerides are valuable compounds with wide applications as emulsifiers in food, pharmaceutical and cosmetic industries. They can be produced by esterification of glycerols with fatty acids
Tratamiento quirúrgico de la escoliosis en el síndrome de Rett: sistema de instrumentación TRANSPINE
El Síndrome de Rett es una afectación neurológica que en los estadios últimos presenta deformidades evolutivas que suelen precisar cirugía. Se han revisado en este estudio 11 pacientes con Síndrome de Rett y deformidad en columna que precisaron cirugía. Se analizaron las magnitudes de las curvas con ángulo de Cobb, alteraciones del plano sagital (cifosis y lordosis), oblicuidad pélvica pre y postoperatoria, niveles de fusión y complicaciones postoperatorias. La corrección media fue del 65%. Se realizó una fusión posterior en todos los pacientes sin incluir sacro pelvis. Los montajes se realizaron principalmente con sistema híbrido de tornillos, ganchos, pinzas y cables laminares TRANSPINE®. Las escoliosis neuromusculares, como el síndrome de Rett, que precisan corrección, pueden controlarse de forma segura y efectiva mediante artrodesis posterior con instrumentación híbrida.Rett Syndrome is a neurological impairment with a typically long C scoliosis curve that often require surgery. In this study it has been reviewed 11 patients with Rett syndrome and spine deformity. We analyzed the magnitudes of the curves with Cobb angle, sagittal plane (kyphosis and lordosis), preoperative and postoperative pelvic obliquity, fusion levels and postoperative complications. The average correction was 65%. Posterior fusion was performed in all patients excluding sacrum pelvis. The assemblies are made mainly with the hybrid system of screws, hooks, clips and cables TRANSPINE®. Neuromuscular scoliosis, such as Rett syndrome, which needs correction, can be controlled safely and effectively by posterior fusion with hybrid constructs
- …