310 research outputs found
MPIFA: A Modified Protocol Independent Fairness Algorithm for Community Wireless Mesh Networks
Community Wireless Mesh Networks (WMN) is a paradigm in wireless
communication of 21st centuary as means of providing high speed braodband
access. Un-cooperative nodes, both selfish and malicious proves to be a
significant threat in Community WMN that require a solution independent of
routing protocols being used. We propose to implement Modified PIFA (MPIFA), an
Improved version of Protocol Independent Fairness Algorithm (PIFA) proposed by
Younghwan Yoo, Sanghyun and P. Agrawal [6] with ability to cater specific
requirements in Community WMN. MPIFA has malicious nodes detection rate
improvement of 50% when nodes demonstrate low probabilistic malicious behavior
of 10% to circumvent the security measures in place. Improvements were also
made to reduce false malicious node detections to 4% when node-to-node link
failures occur in Community WMN.Comment: Innovative Technologies in Intelligent Systems and Industrial
Applications(CITISIA) 200
Manipulating ionization path in a Stark map: Stringent schemes for the selective field ionization in highly excited Rb Rydberg atoms
We have developed a quite stringent method in selectivity to ionize the low
angular- momentum () states which lie below and above the adjacent
manifold in highly excited Rb Rydberg atoms. The method fully exploits the
pulsed field-ionization characteristics of the manifold states in high
slew-rate regime: Specifically the low state below (above) the adjacent
manifold is firstly transferred to the lowest (highest) state in the manifold
via the adiabatic transition at the first avoided crossing in low slew-rate
regime, and then the atoms are driven to a high electric field for ionization
in high slew-rate regime. These extreme states of the manifold are ionized at
quite different fields due to the tunneling process, resulting in thus the
stringent selectivity. Two manipulation schemes to realize this method actually
are demonstrated here experimentally.Comment: 10 pages, 4 figure
Systematic observation of tunneling field-ionization in highly excited Rb Rydberg atoms
Pulsed field ionization of high- (90 150) manifold states in
Rb Rydberg atoms has been investigated in high slew-rate regime. Two peaks in
the field ionization spectra were systematically observed for the investigated
region, where the field values at the lower peak do not almost depend on
the excitation energy in the manifold, while those at the higher peak increase
with increasing excitation energy. The fraction of the higher peak component to
the total ionization signals increases with increasing , exceeding 80% at
= 147. Characteristic behavior of the peak component and the comparison
with theoretical predictions indicate that the higher peak component is due to
the tunneling process. The obtained results show for the first time that the
tunneling process plays increasingly the dominant role at such highly excited
nonhydrogenic Rydberg atoms.Comment: 8 pages, 5 figure
Assessing a candidate IIA dual to metastable supersymmetry-breaking
We analyze the space of linearized non-supersymmetric deformations around a
IIA solution found by Cvetic, Gibbons, Lu and Pope (CGLP) in hep-th/0101096. We
impose boundary conditions aimed at singling out among those perturbations
those describing the backreaction of anti-D2 branes on the CGLP background. The
corresponding supergravity solution is a would-be dual to a metastable
supersymmetry-breaking state. However, it turns out that this candidate bulk
solution is inevitably riddled with IR divergences of its flux densities and
action, whose physical meaning and implications for models of string cosmology
call for further investigation.Comment: 33 pages. v2: reference added, clarifications in the introductio
Greenhouse gas emissions from agricultural food production to supply Indian diets: Implications for climate change mitigation
Agriculture is a major source of greenhouse gas (GHG) emissions globally. The growing global population is putting pressure on agricultural production systems that aim to secure food production while minimising GHG emissions. In this study, the GHG emissions associated with the production of major food commodities in India are calculated using the Cool Farm Tool. GHG emissions, based on farm management for major crops (including cereals like wheat and rice, pulses, potatoes, fruits and vegetables) and livestock-based products (milk, eggs, chicken and mutton meat), are quantified and compared. Livestock and rice production were found to be the main sources of GHG emissions in Indian agriculture with a country average of 5.65 kg CO2eq kg-1 rice, 45.54 kg CO2eq kg-1 mutton meat and 2.4 kg CO2eq kg-1 milk. Production of cereals (except rice), fruits and vegetables in India emits comparatively less GHGs with <1 kg CO2eq kg-1 product. These findings suggest that a shift towards dietary patterns with greater consumption of animal source foods could greatly increase GHG emissions from Indian agriculture. A range of mitigation options are available that could reduce emissions from current levels and may be compatible with increased future food production and consumption demands in India
DCC expression is related to mucinous differentiation but not changes in expression of p21WAF1/Cip1 and p27Kip1, apoptosis, cell proliferation and human papillomavirus infection in uterine cervical adenocarcinomas
Nodulation, arbuscular mycorrhizal colonization and growth of some legumes native from Brazil
Genomic Profiling of Advanced-Stage Oral Cancers Reveals Chromosome 11q Alterations as Markers of Poor Clinical Outcome
Identifying oral cancer lesions associated with high risk of relapse and predicting clinical outcome remain challenging questions in clinical practice. Genomic alterations may add prognostic information and indicate biological aggressiveness thereby emphasizing the need for genome-wide profiling of oral cancers. High-resolution array comparative genomic hybridization was performed to delineate the genomic alterations in clinically annotated primary gingivo-buccal complex and tongue cancers (n = 60). The specific genomic alterations so identified were evaluated for their potential clinical relevance. Copy-number changes were observed on chromosomal arms with most frequent gains on 3q (60%), 5p (50%), 7p (50%), 8q (73%), 11q13 (47%), 14q11.2 (47%), and 19p13.3 (58%) and losses on 3p14.2 (55%) and 8p (83%). Univariate statistical analysis with correction for multiple testing revealed chromosomal gain of region 11q22.1–q22.2 and losses of 17p13.3 and 11q23–q25 to be associated with loco-regional recurrence (P = 0.004, P = 0.003, and P = 0.0003) and shorter survival (P = 0.009, P = 0.003, and P 0.0001) respectively. The gain of 11q22 and loss of 11q23-q25 were validated by interphase fluorescent in situ hybridization (I-FISH). This study identifies a tractable number of genomic alterations with few underlying genes that may potentially be utilized as biological markers for prognosis and treatment decisions in oral cancers
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