49,207 research outputs found
Predicting Performance of Channel Assignments in Wireless Mesh Networks through Statistical Interference Estimation
Wireless Mesh Network (WMN) deployments are poised to reduce the reliance on
wired infrastructure especially with the advent of the multi-radio
multi-channel (MRMC) WMN architecture. But the benefits that MRMC WMNs offer
viz., augmented network capacity, uninterrupted connectivity and reduced
latency, are depreciated by the detrimental effect of prevalent interference.
Interference mitigation is thus a prime objective in WMN deployments. It is
often accomplished through prudent channel allocation (CA) schemes which
minimize the adverse impact of interference and enhance the network
performance. However, a multitude of CA schemes have been proposed in research
literature and absence of a CA performance prediction metric, which could aid
in the selection of an efficient CA scheme for a given WMN, is often felt. In
this work, we offer a fresh characterization of the interference endemic in
wireless networks. We then propose a reliable CA performance prediction metric,
which employs a statistical interference estimation approach. We carry out a
rigorous quantitative assessment of the proposed metric by validating its CA
performance predictions with experimental results, recorded from extensive
simulations run on an ns-3 802.11g environment
Sustaining Rural Livelihoods in Fragile Environments : Resource Endowments or Policy Interventions?
This paper primarily assesses the status of rural livelihoods in fragile environments with diverse resource endowments and policy interventions. The objective was to examine the effectiveness of resource enhancing policy interventions like watershed development in reducing resource endowment imbalances across villages and regions. Livelihood assessment was carried out using the sustainable rural livelihoods (SRL) framework in the fragile regions of Andhra Pradesh. Qualitative and quantitative approaches were used to assess the rural livelihoods covering all the 555 households in three sample villages. It is argued that resource endowments determine the level and dynamics of livelihoods at the household level rather than policy interventions per se. On the other hand, policy interventions, given the status and structure of the economy, only act as catalysts. Policies for strengthening the resource base are necessary but not sufficient to address the livelihood issues. In the present case it is shown that availability of water (irrigation) is more important than the recent policy interventions like watershed development for improving the livelihoods. Nevertheless, policy interventions towards human capital development (education, skills, etc) could be rewarding in the long run. Unless policies are directed towards bringing changes in natural resource endowments (especially water) at the household level, it is unlikely that the on going policy interventions would transform the rural livelihoods in the fragile environments.Rural livelihoods, resource endowments, watershed development, policy
Sustaining rural livelihoods in fragile environments: Resource endowments or policy interventions?
This paper primarily assesses the status of rural livelihoods in fragile environments with diverse resource endowments and policy interventions. The objective was to examine the effectiveness of resource enhancing policy interventions like watershed development in reducing resource endowment imbalances across villages and regions. Livelihood assessment was carried out using the sustainable rural livelihoods (SRL) framework in the fragile regions of Andhra Pradesh. Qualitative and quantitative approaches were used to assess the rural livelihoods covering all the 555 households in three sample villages.Rural livelihoods, resource endowments, watershed development, policy interventions, Andhra Pradesh
Reliable Prediction of Channel Assignment Performance in Wireless Mesh Networks
The advancements in wireless mesh networks (WMN), and the surge in
multi-radio multi-channel (MRMC) WMN deployments have spawned a multitude of
network performance issues. These issues are intricately linked to the adverse
impact of endemic interference. Thus, interference mitigation is a primary
design objective in WMNs. Interference alleviation is often effected through
efficient channel allocation (CA) schemes which fully utilize the potential of
MRMC environment and also restrain the detrimental impact of interference.
However, numerous CA schemes have been proposed in research literature and
there is a lack of CA performance prediction techniques which could assist in
choosing a suitable CA for a given WMN. In this work, we propose a reliable
interference estimation and CA performance prediction approach. We demonstrate
its efficacy by substantiating the CA performance predictions for a given WMN
with experimental data obtained through rigorous simulations on an ns-3 802.11g
environment.Comment: Accepted in ICACCI-201
Radio Co-location Aware Channel Assignments for Interference Mitigation in Wireless Mesh Networks
Designing high performance channel assignment schemes to harness the
potential of multi-radio multi-channel deployments in wireless mesh networks
(WMNs) is an active research domain. A pragmatic channel assignment approach
strives to maximize network capacity by restraining the endemic interference
and mitigating its adverse impact on network performance. Interference
prevalent in WMNs is multi-faceted, radio co-location interference (RCI) being
a crucial aspect that is seldom addressed in research endeavors. In this
effort, we propose a set of intelligent channel assignment algorithms, which
focus primarily on alleviating the RCI. These graph theoretic schemes are
structurally inspired by the spatio-statistical characteristics of
interference. We present the theoretical design foundations for each of the
proposed algorithms, and demonstrate their potential to significantly enhance
network capacity in comparison to some well-known existing schemes. We also
demonstrate the adverse impact of radio co- location interference on the
network, and the efficacy of the proposed schemes in successfully mitigating
it. The experimental results to validate the proposed theoretical notions were
obtained by running an exhaustive set of ns-3 simulations in IEEE 802.11g/n
environments.Comment: Accepted @ ICACCI-201
Hybrid stars that masquerade as neutron stars
We show that a hybrid (nuclear + quark matter) star can have a mass-radius
relationship very similar to that predicted for a star made of purely nucleonic
matter. We show this for a generic parameterization of the quark matter
equation of state, and also for an MIT bag model, each including a
phenomenological correction based on gluonic corrections to the equation of
state. We obtain hybrid stars as heavy as 2 M_solar for reasonable values of
the bag model parameters. For nuclear matter, we use the equation of state
calculated by Akmal, Pandharipande, and Ravenhall using many-body techniques.
Both mixed and homogeneous phases of nuclear and quark matter are considered.Comment: 22 pages, LaTeX. Extra figure and explanation adde
- …