806 research outputs found
The future of techno-disruption in gig economy workforces: challenging the dialogue with fictional abstracts
In this article we explore near-future of the pervasive computing, AI, and HCI in the context of the disruptive potential of technologies on workers in the on-demand gig economy. Using fictional abstracts, the authors muse on dystopian case studies of: independent contractors, last-mile couriers, teachers, and creative professionals. This article serves as base for critical reflections on: 1) the need for multidisciplinary approaches when tackling broader and far-reaching societal implications of digital technology in the gig economy, and 2) the potential role of fictional abstracts in the design process of future digital technologies
Thinking Outside the Bag:Worker-led Speculation and the Future of Gig Economy Delivery Platforms
Gig economy is presented as disruptive, technologically driven, and forward thinking. Design is explicit in this framing, through use of slick apps to reduce friction and simplify experience for customer and worker. However, this framing is often driven by the platforms, and does not fully recognize the actual experience of work. In this paper we report on a collaborative design process on developing concepts for the future of gig work from a worker-centric perspective. This explicitly does not involve the platforms as stakeholders and uses design fiction as a tool for workers to express fears, joys, and the aspects of their work that are nuanced, reflective and surprising. We reflect on the designs created through this process, the tensions, and opportuni- ties with working with gig working couriers, and issues around power and representa- tion when designing with and for this community
Lessons from one future of work: opportunities to flip the gig economy
Pervasive technologies are already transforming "The Future of Work". Mobile technologies, IoT, and data promise efficient and convenient work `on-demand'. They are convenient too for for platform providers whose clean and efficient interfaces for consumers disrupt marketplaces, offering digitally mediated access to services at a click. These same technologies provide access to work and labour markets whilst undermining promising flexible work and access to sufficient work. The global gig economy is expanding. Increasing numbers of workers see gig economy work as their main form of employment, yet have little voice in the construction of systems on which they depend. We argue that technologists must work with gig workers, policy makers and other stakeholders to address the adverse effects of technologies on gig workers. To better understand relationships between workers and the technologies they use, we describe insights from research carried out with UK cycle couriers. We reflect on technology's role in giving these workers' agency, rights and equity by design
Rivastigmine for gait stability in patients with Parkinson's disease (ReSPonD): a randomised, double-blind, placebo-controlled, phase 2 trial
Background Falls are a frequent and serious complication of Parkinson's disease and are related partly to an underlying cholinergic deficit that contributes to gait and cognitive dysfunction in these patients. Gait dysfunction can lead to an increased variability of gait from one step to another, raising the likelihood of falls. In the ReSPonD trial we aimed to assess whether ameliorating this cholinergic deficit with the acetylcholinesterase inhibitor rivastigmine would reduce gait variability. Methods We did this randomised, double-blind, placebo-controlled, phase 2 trial at the North Bristol NHS Trust Hospital, Bristol, UK, in patients with Parkinson's disease recruited from community and hospital settings in the UK. We included patients who had fallen at least once in the year before enrolment, were able to walk 18 m without an aid, had no previous exposure to an acetylcholinesterase inhibitor, and did not have dementia. Our clinical trials unit randomly assigned (1:1) patients to oral rivastigmine or placebo capsules (both taken twice a day) using a computer-generated randomisation sequence and web-based allocation. Rivastigmine was uptitrated from 3 mg per day to the target dose of 12 mg per day over 12 weeks. Both the trial team and patients were masked to treatment allocation. Masking was achieved with matched placebo capsules and a dummy uptitration schedule. The primary endpoint was difference in step time variability between the two groups at 32 weeks, adjusted for baseline age, cognition, step time variability, and number of falls in the previous year. We measured step time variability with a triaxial accelerometer during an 18 m walking task in three conditions: normal walking, simple dual task with phonemic verbal fluency (walking while naming words beginning with a single letter), and complex dual task switching with phonemic verbal fluency (walking while naming words, alternating between two letters of the alphabet). Analysis was by modified intention to treat; we excluded from the primary analysis patients who withdrew, died, or did not attend the 32 week assessment. This trial is registered with ISRCTN, number 19880883. Findings Between Oct 4, 2012 and March 28, 2013, we enrolled 130 patients and randomly assigned 65 to the rivastigmine group and 65 to the placebo group. At week 32, compared with patients assigned to placebo (59 assessed), those assigned to rivastigmine (55 assessed) had improved step time variability for normal walking (ratio of geometric means 0·72, 95% CI 0·58–0·88; p=0·002) and the simple dual task (0·79; 0·62–0·99; p=0·045). Improvements in step time variability for the complex dual task did not differ between groups (0·81, 0·60–1·09; p=0·17). Gastrointestinal side-effects were more common in the rivastigmine group than in the placebo group (p<0·0001); 20 (31%) patients in the rivastigmine group versus three (5%) in the placebo group had nausea and 15 (17%) versus three (5%) had vomiting
The Great Observatories All-Sky LIRG Survey: Comparison of Ultraviolet and Far-Infrared Properties
The Great Observatories All-sky LIRG Survey (GOALS) consists of a complete
sample of 202 Luminous Infrared Galaxies (LIRGs) selected from the IRAS Revised
Bright Galaxy Sample (RBGS). The galaxies span the full range of interaction
stages, from isolated galaxies to interacting pairs to late stage mergers. We
present a comparison of the UV and infrared properties of 135 galaxies in GOALS
observed by GALEX and Spitzer. For interacting galaxies with separations
greater than the resolution of GALEX and Spitzer (2-6"), we assess the UV and
IR properties of each galaxy individually. The contribution of the FUV to the
measured SFR ranges from 0.2% to 17.9%, with a median of 2.8% and a mean of 4.0
+/- 0.4%. The specific star formation rate of the GOALS sample is extremely
high, with a median value (3.9*10^{-10} yr^{-1}) that is comparable to the
highest specific star formation rates seen in the Spitzer Infrared Nearby
Galaxies Survey sample. We examine the position of each galaxy on the IR
excess-UV slope (IRX-beta) diagram as a function of galaxy properties,
including IR luminosity and interaction stage. The LIRGs on average have
greater IR excesses than would be expected based on their UV colors if they
obeyed the same relations as starbursts with L_IR < 10^{11}L_0 or normal
late-type galaxies. The ratio of L_IR to the value one would estimate from the
IRXg-beta relation published for lower luminosity starburst galaxies ranges
from 0.2 to 68, with a median value of 2.7. A minimum of 19% of the total IR
luminosity in the RBGS is produced in LIRGs and ULIRGs with red UV colors (beta
> 0). Among resolved interacting systems, 32% contain one galaxy which
dominates the IR emission while the companion dominates the UV emission. Only
21% of the resolved systems contain a single galaxy which dominates both
wavelengths.Comment: 37 pages, 10 figures, accepted for publication in Ap
Water waves generated by a moving bottom
Tsunamis are often generated by a moving sea bottom. This paper deals with
the case where the tsunami source is an earthquake. The linearized water-wave
equations are solved analytically for various sea bottom motions. Numerical
results based on the analytical solutions are shown for the free-surface
profiles, the horizontal and vertical velocities as well as the bottom
pressure.Comment: 41 pages, 13 figures. Accepted for publication in a book: "Tsunami
and Nonlinear Waves", Kundu, Anjan (Editor), Springer 2007, Approx. 325 p.,
170 illus., Hardcover, ISBN: 978-3-540-71255-8, available: May 200
Political Theory, Political Science, And The End Of Civic Engagement
Within a span of fifteen years civic engagement has become a cottage industry in political science and political theory, but the term has now outlived its usefulness and exemplifies Giovanni Sartori\u27s worry about conceptual stretching. This article traces civic engagement\u27s ascension as a catch-all term for almost anything that citizens might happen to do together or alone, and illustrates the confusion that its popularity has occasioned. It proposes that civic engagement meet a well-deserved end, to be replaced with a more nuanced and descriptive set of engagements: political, social, and moral. It also examines the appeal of engagement itself, a term that entails both attention and energy. Attention and energy are the mainsprings of politics and most other challenging human endeavors. But they can be invested politically, or in associative pursuits, or in moral reasoning and follow-through, and those types of engagement can, but need not, coincide. We should be asking which kinds of engagement-which kinds of attention and energetic activity-make democracy work, and how they might be measured and promoted
Spectral triples for the Sierpinski Gasket
We construct a family of spectral triples for the Sierpinski Gasket . For
suitable values of the parameters, we determine the dimensional spectrum and
recover the Hausdorff measure of in terms of the residue of the volume
functional tr at its abscissa of convergence , which
coincides with the Hausdorff dimension of the fractal. We determine the
associated Connes' distance showing that it is bi-Lipschitz equivalent to the
distance on induced by the Euclidean metric of the plane, and show that the
pairing of the associated Fredholm module with (odd) -theory is non-trivial.
When the parameters belong to a suitable range, the abscissa of convergence
of the energy functional
tr takes the value
, which we call energy dimension, and the
corresponding residue gives the standard Dirichlet form on .Comment: 48 pages, 9 figures. Final version, to appear in J.Funct.Ana
Pearling and Pinching: Propagation of Rayleigh Instabilities
A new category of front propagation problems is proposed in which a spreading
instability evolves through a singular configuration before saturating. We
examine the nature of this front for the viscous Rayleigh instability of a
column of one fluid immersed in another, using the marginal stability criterion
to estimate the front velocity, front width, and the selected wavelength in
terms of the surface tension and viscosity contrast. Experiments are suggested
on systems that may display this phenomenon, including droplets elongated in
extensional flows, capillary bridges, liquid crystal tethers, and viscoelastic
fluids. The related problem of propagation in Rayleigh-like systems that do not
fission is also considered.Comment: Revtex, 7 pages, 4 ps figs, PR
Optimal Self-Organization
We present computational and analytical results indicating that systems of
driven entities with repulsive interactions tend to reach an optimal state
associated with minimal interaction and minimal dissipation. Using concepts
from non-equilibrium thermodynamics and game theoretical ideas, we generalize
this finding to an even wider class of self-organizing systems which have the
ability to reach a state of maximal overall ``success''. This principle is
expected to be relevant for driven systems in physics like sheared granular
media, but it is also applicable to biological, social, and economic systems,
for which only a limited number of quantitative principles are available yet.Comment: This is the detailled revised version of a preprint on
``Self-Organised Optimality'' (cond-mat/9903319). For related work see
http://www.theo2.physik.uni-stuttgart.de/helbing.html and
http://angel.elte.hu/~vicsek
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