E-Bayesian and Hierarchical Bayesian Estimation of Hazard rate for Kumaraswamy Distribution

In this article, with the use of the Bayesian, Expected Bayesian, and H-Bayesian estimation methods, the shape parameter and hazard rate of the Kumaraswamy distribution are calculated. Three separate loss functions the Squared Error loss function(SELF), the Precautionary loss function(PLF), and the Asymmetry loss function(ALF) along with an informative prior the Gamma prior are used to provide the estimates . The definitions and properties of the proposed estimators are given. Monte Carlo simulation is used to compare all of the estimates in terms of mean square error (MSE). Taking data from the real world, different estimation methodologies’ efficacy has also been studied. Numerical analyses show that the E-Bayesian estimates outperform the Bayesian and Hierarchical estimates

Performance Analysis of Indoor Optical Wireless Links

Indoor wireless optical communication is a good alternative to existing mature RF technology. However various challenges in indoor optical wireless technology are due to free space loss, ambient light, and multi path dispersion causing inter symbol interference (ISI). The degradation in performance due to these facts is very much influenced by the channel topology. So in this paper the performance of indoor optical configuration has been analyzed using three types of channel topologies viz., directed (LOS), non-directed (LOS), and multi beam diffused link for various transmitter and receiver design parameters. The analysis has been carried using Optiwave simulation tools

Utility of doppler derived middle cerebral artery: peak systolic velocity and pulsatility index in prediction of perinatal outcomes of IUGR pregnancies

Background: To determine the association of Middle cerebral artery-peak systolic velocity (MCA-PCV) and perinatal outcome among IUGR fetuses. Longitudinal changes occurring in MCA-pulsatality index and MCA-PSV in IUGR fetuses were studied and the performance of MCA-PI, MCA-PSV in IUGR fetuses was compared.Methods: Hospital based cohort study of 40 IUGR fetuses (gestation age 28-36 weeks, Estimated fetal weight 95th percentile) in whom MCA-PSV values were obtained on three or more occasions from the time of admission till delivery depending upon period of gestation and severity of IUGR. For analysis purpose two groups were made of twenty patients each depending upon MCA-PSV.Results: All the fetuses (100%) in group B (i.e. with abnormal MCA-PSV) had adverse perinatal outcome in the form of either mortality or major neonatal complication consisting of Newborn intensive care unit stay ≥14 days, requirement of artificial ventilation or presence of intraventricular hemorrhage, respiratory distress or sepsis. Specificity of abnormal MCA-PSV was found to be 100% in predicting adverse perinatal outcome. When followed longitudinally, in the three fetuses having fetal death, the PSV showed an initial increase in velocity followed by a fall prior to demise, thus suggesting that it could be a pre-terminal eventConclusions: Fetal MCA-PSV appears to be a reliable indicator of adverse perinatal outcome in growth restricted fetuses thus implying that abnormality in MCA-PSV warrants stringent monitoring. Serial Doppler examinations of fetal MCA-PSV provide better information than does a single measurement

Utility of doppler derived middle cerebral artery: peak systolic velocity and pulsatility index in prediction of perinatal outcomes of IUGR pregnancies

Background: To determine the association of Middle cerebral artery-peak systolic velocity (MCA-PCV) and perinatal outcome among IUGR fetuses. Longitudinal changes occurring in MCA-pulsatality index and MCA-PSV in IUGR fetuses were studied and the performance of MCA-PI, MCA-PSV in IUGR fetuses was compared.Methods: Hospital based cohort study of 40 IUGR fetuses (gestation age 28-36 weeks, Estimated fetal weight <10th percentile, Umbilical artery PI>95th percentile) in whom MCA-PSV values were obtained on three or more occasions from the time of admission till delivery depending upon period of gestation and severity of IUGR. For analysis purpose two groups were made of twenty patients each depending upon MCA-PSV.Results: All the fetuses (100%) in group B (i.e. with abnormal MCA-PSV) had adverse perinatal outcome in the form of either mortality or major neonatal complication consisting of Newborn intensive care unit stay ≥14 days, requirement of artificial ventilation or presence of intraventricular hemorrhage, respiratory distress or sepsis. Specificity of abnormal MCA-PSV was found to be 100% in predicting adverse perinatal outcome. When followed longitudinally, in the three fetuses having fetal death, the PSV showed an initial increase in velocity followed by a fall prior to demise, thus suggesting that it could be a pre-terminal eventConclusions: Fetal MCA-PSV appears to be a reliable indicator of adverse perinatal outcome in growth restricted fetuses thus implying that abnormality in MCA-PSV warrants stringent monitoring. Serial Doppler examinations of fetal MCA-PSV provide better information than does a single measurement

Chemistry and mineralogy of the margin unit, Jezero Crater, Mars, observed by M2020 / Supercam

International audienceThe Margin Unit of Jezero crater, Mars, was identified from orbit as one of the most carbonate-rich regions of the planet [e.g., 1,2]. Its presence, along with the adjacent fluvial delta [e.g., 3] made Jezero crater the most compelling landing site for the Mars 2020 mission [4]. Investigation of Jezero’s Margin-Unit carbonates provides a unique opportunity to address the formation of carbonates in sedimentary deposits, possibly under a CO2-rich martian atmosphere. Here we report on chemistry and mineralogy of 55 targets observed by the multi-technique SuperCam instrument during Perseverance’s crater-margin campaign

CHEMISTRY AND MINERALOGY OF THE MARGIN UNIT, JEZERO CRATER, MARS, OBSERVED BY M2020 / SUPERCAM

International audienceThe Margin Unit of Jezero crater, Mars, was identified from orbit as one of the most carbonate-rich regions of the planet [e.g., 1,2]. Its presence, along with the adjacent fluvial delta [e.g., 3] made Jezero crater the most compelling landing site for the Mars 2020 mission [4]. Investigation of Jezero’s Margin-Unit carbonates provides a unique opportunity to address the formation of carbonates in sedimentary deposits, possibly under a CO2-rich martian atmosphere. Here we report on chemistry and mineralogy of 55 targets observed by the multi-technique SuperCam instrument during Perseverance’s crater-margin campaign

CHEMISTRY AND MINERALOGY OF THE MARGIN UNIT, JEZERO CRATER, MARS, OBSERVED BY M2020 / SUPERCAM

International audienceThe Margin Unit of Jezero crater, Mars, was identified from orbit as one of the most carbonate-rich regions of the planet [e.g., 1,2]. Its presence, along with the adjacent fluvial delta [e.g., 3] made Jezero crater the most compelling landing site for the Mars 2020 mission [4]. Investigation of Jezero’s Margin-Unit carbonates provides a unique opportunity to address the formation of carbonates in sedimentary deposits, possibly under a CO2-rich martian atmosphere. Here we report on chemistry and mineralogy of 55 targets observed by the multi-technique SuperCam instrument during Perseverance’s crater-margin campaign

CHEMISTRY AND MINERALOGY OF THE MARGIN UNIT, JEZERO CRATER, MARS, OBSERVED BY M2020 / SUPERCAM

International audienceThe Margin Unit of Jezero crater, Mars, was identified from orbit as one of the most carbonate-rich regions of the planet [e.g., 1,2]. Its presence, along with the adjacent fluvial delta [e.g., 3] made Jezero crater the most compelling landing site for the Mars 2020 mission [4]. Investigation of Jezero’s Margin-Unit carbonates provides a unique opportunity to address the formation of carbonates in sedimentary deposits, possibly under a CO2-rich martian atmosphere. Here we report on chemistry and mineralogy of 55 targets observed by the multi-technique SuperCam instrument during Perseverance’s crater-margin campaign