57 research outputs found
PROTECT: Proximity-based Trust-advisor using Encounters for Mobile Societies
Many interactions between network users rely on trust, which is becoming
particularly important given the security breaches in the Internet today. These
problems are further exacerbated by the dynamics in wireless mobile networks.
In this paper we address the issue of trust advisory and establishment in
mobile networks, with application to ad hoc networks, including DTNs. We
utilize encounters in mobile societies in novel ways, noticing that mobility
provides opportunities to build proximity, location and similarity based trust.
Four new trust advisor filters are introduced - including encounter frequency,
duration, behavior vectors and behavior matrices - and evaluated over an
extensive set of real-world traces collected from a major university. Two sets
of statistical analyses are performed; the first examines the underlying
encounter relationships in mobile societies, and the second evaluates DTN
routing in mobile peer-to-peer networks using trust and selfishness models. We
find that for the analyzed trace, trust filters are stable in terms of growth
with time (3 filters have close to 90% overlap of users over a period of 9
weeks) and the results produced by different filters are noticeably different.
In our analysis for trust and selfishness model, our trust filters largely undo
the effect of selfishness on the unreachability in a network. Thus improving
the connectivity in a network with selfish nodes.
We hope that our initial promising results open the door for further research
on proximity-based trust
ANALYZING EPIDEMIOLOGICAL PATTERNS OF CONTACT DERMATITIS AMONG PATIENTS FROM BOTH RURAL AND URBAN AREAS: A CROSS-SECTIONAL STUDY.
Background
The number of dermatitis caused by contact cases is on the rise. There is few research on the occurrence and demographic traits of skin allergies in India. The purpose of this study was to determine how common dermatitis is caused by contact and assess the pattern of epidemiology of the condition in rural and urban communities.
Methods
Each participant signed an informed agreement, and the study was carried out in a medical school in an eastern Indian semi-urban area. A cross-sectional study was conducted at Darbhanga Medical College & Hospital in Lehariasarai, Bihar, India for a period of 6 months. There were 134 patients in the study group who were seen in the outpatient department (OPD) of dermatology and had lesions that were clinically indicating that contact dermatitis exists. Depending on their address, patients visiting the OPD were separated into rural and urban groups. The statistical techniques used for data analysis were appropriate, standard, and suitable.
Results
Participants in the dermatological OPD had a contact dermatitis rate of 4.38%. The prevalence in urban areas was substantially (P < 0.05) higher than that in rural areas. More number of patients were observed in the age group of 41-50. Women were more impacted in urban regions than in rural ones. In terms of occupation, there was a difference that was statistically significant (P < 0.05) between contact dermatitis patients in urban and rural areas. The urban group had a considerably higher cosmetic history (P < 0.05).
Conclusion
There was a significant statistical variation in the prevalence of contact dermatitis and patient profiles for some characteristics, between individuals living in rural and urban areas.
Recommendation
More study population would be needed at different intervals to validate the study findings and ascertain if these modifications are transient or permanent
A Software-equivalent SNN Hardware using RRAM-array for Asynchronous Real-time Learning
Spiking Neural Network (SNN) naturally inspires hardware implementation as it
is based on biology. For learning, spike time dependent plasticity (STDP) may
be implemented using an energy efficient waveform superposition on memristor
based synapse. However, system level implementation has three challenges.
First, a classic dilemma is that recognition requires current reading for short
voltagespikes which is disturbed by large voltagewaveforms that are
simultaneously applied on the same memristor for realtime learning i.e. the
simultaneous readwrite dilemma. Second, the hardware needs to exactly
replicate software implementation for easy adaptation of algorithm to hardware.
Third, the devices used in hardware simulations must be realistic. In this
paper, we present an approach to address the above concerns. First, the
learning and recognition occurs in separate arrays simultaneously in
realtime, asynchronously avoiding nonbiomimetic clocking based
complex signal management. Second, we show that the hardware emulates software
at every stage by comparison of SPICE (circuitsimulator) with MATLAB
(mathematical SNN algorithm implementation in software) implementations. As an
example, the hardware shows 97.5 per cent accuracy in classification which is
equivalent to software for a FisherIris dataset. Third, the STDP is
implemented using a model of synaptic device implemented using HfO2 memristor.
We show that an increasingly realistic memristor model slightly reduces the
hardware performance (85 per cent), which highlights the need to engineer RRAM
characteristics specifically for SNN.Comment: Eight pages, ten figures and two table
Safe Human Robot-Interaction using Switched Model Reference Admittance Control
Physical Human-Robot Interaction (pHRI) task involves tight coupling between
safety constraints and compliance with human intentions. In this paper, a novel
switched model reference admittance controller is developed to maintain
compliance with the external force while upholding safety constraints in the
workspace for an n-link manipulator involved in pHRI. A switched reference
model is designed for the admittance controller to generate the reference
trajectory within the safe workspace. The stability analysis of the switched
reference model is carried out by an appropriate selection of the Common
Quadratic Lyapunov Function (CQLF) so that asymptotic convergence of the
trajectory tracking error is ensured. The efficacy of the proposed controller
is validated in simulation on a two-link robot manipulator
Dielectric response of makrofol-KG polycarbonate irradiated with 145 MeV Ne6+ and 100 MeV Si8+ ions
The passage of heavy ions in a track detector polymeric material produces lattice deformations.
These deformations may be in the form of latent tracks or may vanish by self annealing in time. Heavy ion
irradiation produces modifications in polymers in their relevant electrical, chemical and optical properties in the
form of rearrangement of bonding, cross-linking, chain scission, formation of carbon rich clusters and changes
in dielectric properties etc. Modification depends on the ion, its energy and fluence and the polymeric material. In
the present work, a study of the dielectric response of pristine and heavy ion irradiated Makrofol-KG polycarbonate
is carried out. 40 μm thick Makrofol-KG polycarbonate films were irradiated to various fluences with Si8+ ions of
100 MeV energy from Pelletron at Inter University Accelerator Centre (IUAC), New Delhi and Ne6+ ions of 145 MeV
from Variable Energy Cyclotron Centre, Kolkata. On irradiation with heavy ions dielectric constant ( ) decreases
with frequency where increases with fluence for both the ions. Variation of loss factor (tan ) with frequency
for pristine and irradiated with Si ions reveals that tan increases as the frequency increases. Tan also
increases with fluence. While Ne irradiated samples tan shows slight variation with frequency as well as with
fluence. Tan has positive values indicating the dominance of inductive behavior.Author Affiliation: Rajesh Kumar, S Asad Ali, Udayan De, D K Avasthi and Rajendra Prasad
1.Department of Applied Physics, Z H College of Engineering & Technology,
Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, India
2.Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, India
3.Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi-110 067, India
E-mail : [email protected] of Applied Physics, Z H College of Engineering & Technology,
Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, India
Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, India
Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi-110 067, Indi
Schottky Barrier MOSFET Enabled Ultra-Low Power Real-Time Neuron for Neuromorphic Computing
Energy-efficient real-time synapses and neurons are essential to enable
large-scale neuromorphic computing. In this paper, we propose and demonstrate
the Schottky-Barrier MOSFET-based ultra-low power voltage-controlled current
source to enable real-time neurons for neuromorphic computing. Schottky-Barrier
MOSFET is fabricated on a Silicon-on-insulator platform with polycrystalline
Silicon as the channel and Nickel/Platinum as the source/drain. The Poly-Si and
Nickel make the back-to-back Schottky junction enabling ultra-low ON current
required for energy-efficient neurons
Treatment of Subject Descriptors on Children in Twenty Three DDC Editions
The study explores the treatment of subject descriptors on children and its correlated subjects in the 23 DDC editions by adopting an assessment and evaluation study. Authors found that the Home and family management (640) class holds the maximum subject descriptors on children
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