1,119 research outputs found
Information technology, innovation and human development: hospital information systems in an Indian State
This paper addresses the topic of how innovation based on information and communication technologies (ICTs) can contribute to human development. A theoretical framework is developed in two stages. Firstly, ICT-based innovation is conceptualized as involving technological, social and institutional innovations. Secondly, Sen’s capability approach is drawn on to theorize how such innovations can contribute to human development. The theoretical framework is used as a basis to explore a rich case study of the development and use of a hospital information system within the public sector of the State of Himachal Pradesh in India. The paper analyses both the potential that the system has to promote positive development outcomes in the State, but also the challenges which constrain that impact. Three human development themes are identified and discussed: strengthening processes to include the disadvantaged; empowering the patient and making communal voices count. Finally, it is argued that the theoretical approach in the paper may have applicability in other contexts where ICT-based innovations are aiming to support human development outcomes
On The Phase Structure and Thermodynamic Geometry of R-Charged Black Holes
We study the phase structure and equilibrium state space geometry of
R-charged black holes in , 4 and 7 and the corresponding rotating ,
and branes. For various charge configurations of the compact black
holes in the canonical ensemble we demonstrate new liquid-gas like phase
coexistence behaviour culminating in second order critical points. The critical
exponents turn out to be the same as that of four dimensional asymptotically
AdS black holes in Einstein Maxwell theory. We further establish that the
regions of stability for R-charged black holes are, in some cases, more
constrained than is currently believed, due to properties of some of the
response coefficients. The equilibrium state space scalar curvature is
calculated for various charge configurations, both for the case of compact as
well as flat horizons and its asymptotic behaviour with temperature is
established.Comment: 1 + 33 pages, LaTeX, 25 figures. References adde
How Potent are Evasion Attacks for Poisoning Federated Learning-Based Signal Classifiers?
There has been recent interest in leveraging federated learning (FL) for
radio signal classification tasks. In FL, model parameters are periodically
communicated from participating devices, training on their own local datasets,
to a central server which aggregates them into a global model. While FL has
privacy/security advantages due to raw data not leaving the devices, it is
still susceptible to several adversarial attacks. In this work, we reveal the
susceptibility of FL-based signal classifiers to model poisoning attacks, which
compromise the training process despite not observing data transmissions. In
this capacity, we develop an attack framework in which compromised FL devices
perturb their local datasets using adversarial evasion attacks. As a result,
the training process of the global model significantly degrades on
in-distribution signals (i.e., signals received over channels with identical
distributions at each edge device). We compare our work to previously proposed
FL attacks and reveal that as few as one adversarial device operating with a
low-powered perturbation under our attack framework can induce the potent model
poisoning attack to the global classifier. Moreover, we find that more devices
partaking in adversarial poisoning will proportionally degrade the
classification performance.Comment: 6 pages, Accepted to IEEE ICC 202
Combining Ability Studies in Cowpea for Dual Purpose Types
Cowpea (Vigna unguiculata (L) Walp.) is widely grown all over India more particularly in central and peninsular regions. Grains are consumed as food and the haulms are fed to livestock as a nutritious fodder. Cowpea is is equally important as nutritious fodder for livestock. The use of cowpea as a dual-purpose crop is attractive in mixed crop/livestock systems where land and feed are becoming increasingly scarce (Tarawali et al., 1997) especially in the dry season. Efforts at global level (IITA & ILRI) focused to develop medium-maturing (85-95 days), semi-erect, dual-purpose varieties with higher grain and fodder yields and with enhanced fodder quality
Defending Adversarial Attacks on Deep Learning Based Power Allocation in Massive MIMO Using Denoising Autoencoders
Recent work has advocated for the use of deep learning to perform power
allocation in the downlink of massive MIMO (maMIMO) networks. Yet, such deep
learning models are vulnerable to adversarial attacks. In the context of maMIMO
power allocation, adversarial attacks refer to the injection of subtle
perturbations into the deep learning model's input, during inference (i.e., the
adversarial perturbation is injected into inputs during deployment after the
model has been trained) that are specifically crafted to force the trained
regression model to output an infeasible power allocation solution. In this
work, we develop an autoencoder-based mitigation technique, which allows deep
learning-based power allocation models to operate in the presence of
adversaries without requiring retraining. Specifically, we develop a denoising
autoencoder (DAE), which learns a mapping between potentially perturbed data
and its corresponding unperturbed input. We test our defense across multiple
attacks and in multiple threat models and demonstrate its ability to (i)
mitigate the effects of adversarial attacks on power allocation networks using
two common precoding schemes, (ii) outperform previously proposed benchmarks
for mitigating regression-based adversarial attacks on maMIMO networks, (iii)
retain accurate performance in the absence of an attack, and (iv) operate with
low computational overhead.Comment: This work is currently under review for publicatio
On the Thermodynamic Geometry and Critical Phenomena of AdS Black Holes
In this paper, we study various aspects of the equilibrium thermodynamic
state space geometry of AdS black holes. We first examine the
Reissner-Nordstrom-AdS (RN-AdS) and the Kerr-AdS black holes. In this context,
the state space scalar curvature of these black holes is analysed in various
regions of their thermodynamic parameter space. This provides important new
insights into the structure and significance of the scalar curvature. We
further investigate critical phenomena, and the behaviour of the scalar
curvature near criticality, for KN-AdS black holes in two mixed ensembles,
introduced and elucidated in our earlier work arXiv:1002.2538 [hep-th]. The
critical exponents are identical to those in the RN-AdS and Kerr-AdS cases in
the canonical ensemble. This suggests an universality in the scaling behaviour
near critical points of AdS black holes. Our results further highlight
qualitative differences in the thermodynamic state space geometry for electric
charge and angular momentum fluctuations of these.Comment: 1 + 37 Pages, LaTeX, includes 31 figures. A figure and a
clarification added
Conservation of wild silkworm genetic resources through cryopreservation: Standardization of sperm processing
Conservation of the invaluable sericigenous genetic resources is of prime importance with respect to their utilization and improvement for wider exploitation. Conservation of wild silkworms and its applicability in hybridization have limitations due to incompatibility, less amenability, change of behaviour under ex situ conditions, non-synchronization of moth eclosion and difficulties in mating between variables. In view of this, the newer technologies such as cryopreservation and artificial insemination are offering better strategies for preservation of biologically active samples like semen at sub-zero temperature (-196º C) conditions for longer duration. In this context, under standardization of sperms preservation from wild silkworms, two methods of semen collection were scrutinized for obtaining active and viable sperm for cryopreservation and further artificial insemination. Semen collection from the seminal vesicle of freshly emerged male moth and the other from the bursa copulatrix (BC) and spermatheca of the female moth after mating. The sperms in the semen collected from seminal vesicle are in the form of bundles known as eupyrene sperm bundles and apyrene sperms. The morphology and behaviour of these sperm bundles were recorded through microscopic examination. To study the density and motility behaviour of the sperms, sperm bundles were treated with proteolytic enzyme (~2-3µg/ml) to digest the membrane and release the sperms. The density and motility behaviour of sperms in the semen recovered from the BC and spermatheca of female moth after mating were higher compared to those released after digestion of sperm bundles from seminal vesicle of the male moth
Kerr-Newman Black Hole Thermodynamical State Space: Blockwise Coordinates
A coordinate system that blockwise-simplifies the Kerr-Newman black hole's
thermodynamical state space Ruppeiner metric geometry is constructed, with
discussion of the limiting cases corresponding to simpler black holes. It is
deduced that one of the three conformal Killing vectors of the
Reissner-Nordstrom and Kerr cases (whose thermodynamical state space metrics
are 2 by 2 and conformally flat) survives generalization to the Kerr-Newman
case's 3 by 3 thermodynamical state space metric.Comment: 4 pages incl 2 figs. Accepted by Gen. Rel. Grav. Replaced with
Accepted version (minor corrections
Phase transition and scaling behavior of topological charged black holes in Horava-Lifshitz gravity
Gravity can be thought as an emergent phenomenon and it has a nice
"thermodynamic" structure. In this context, it is then possible to study the
thermodynamics without knowing the details of the underlying microscopic
degrees of freedom. Here, based on the ordinary thermodynamics, we investigate
the phase transition of the static, spherically symmetric charged black hole
solution with arbitrary scalar curvature in Ho\v{r}ava-Lifshitz gravity at
the Lifshitz point . The analysis is done using the canonical ensemble
frame work; i.e. the charge is kept fixed. We find (a) for both and
, there is no phase transition, (b) while case exhibits the second
order phase transition within the {\it physical region} of the black hole. The
critical point of second order phase transition is obtained by the divergence
of the heat capacity at constant charge. Near the critical point, we find the
various critical exponents. It is also observed that they satisfy the usual
thermodynamic scaling laws.Comment: Minor corrections, refs. added, to appear in Class. Quant. Grav.
arXiv admin note: text overlap with arXiv:1111.0973 by other author
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