2,261 research outputs found
You can't see what you can't see: Experimental evidence for how much relevant information may be missed due to Google's Web search personalisation
The influence of Web search personalisation on professional knowledge work is
an understudied area. Here we investigate how public sector officials
self-assess their dependency on the Google Web search engine, whether they are
aware of the potential impact of algorithmic biases on their ability to
retrieve all relevant information, and how much relevant information may
actually be missed due to Web search personalisation. We find that the majority
of participants in our experimental study are neither aware that there is a
potential problem nor do they have a strategy to mitigate the risk of missing
relevant information when performing online searches. Most significantly, we
provide empirical evidence that up to 20% of relevant information may be missed
due to Web search personalisation. This work has significant implications for
Web research by public sector professionals, who should be provided with
training about the potential algorithmic biases that may affect their judgments
and decision making, as well as clear guidelines how to minimise the risk of
missing relevant information.Comment: paper submitted to the 11th Intl. Conf. on Social Informatics;
revision corrects error in interpretation of parameter Psi/p in RBO resulting
from discrepancy between the documentation of the implementation in R
(https://rdrr.io/bioc/gespeR/man/rbo.html) and the original definition
(https://dl.acm.org/citation.cfm?id=1852106) as per 20/05/201
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In vivo Firre and Dxz4 deletion elucidates roles for autosomal gene regulation
Recent evidence has determined that the conserved X chromosome mega-structurescontrolled by theFirreandDxz4loci are not required for X chromosome inactivation (XCI) in celllines. Here, we examined the in vivo contribution of these loci by generating mice carrying a singleor double deletion ofFirreandDxz4. We found that these mutants are viable, fertile and show nodefect in random or imprinted XCI. However, the lack of these elements results in manydysregulated genes on autosomes in an organ-specific manner. By comparing the dysregulatedgenes between the single and double deletion, we identified superloop, megadomain, andFirrelocus-dependent gene sets. The largest transcriptional effect was observed in all strains lacking theFirrelocus, indicating that this locus is the main driver for these autosomal expression signatures.Collectively, these findings suggest that these X-linked loci are involved in autosomal generegulation rather than XCI biology
On the algebraic classification of spacetimes
We briefly overview the Petrov classification in four dimensions and its
generalization to higher dimensions.Comment: Submitted to Journal of Physics, conference series, proceedings of
4th meeting on constrained dynamics and quantum gravity, 12-16 September
2005, Sardinia, Ital
3-dimensional Cauchy-Riemann structures and 2nd order ordinary differential equations
The equivalence problem for second order ODEs given modulo point
transformations is solved in full analogy with the equivalence problem of
nondegenerate 3-dimensional CR structures. This approach enables an analog of
the Feffereman metrics to be defined. The conformal class of these (split
signature) metrics is well defined by each point equivalence class of second
order ODEs. Its conformal curvature is interpreted in terms of the basic point
invariants of the corresponding class of ODEs
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