Background: Congenital heart disease is defined as a gross structural abnormality of the heart or intrathoracic great vessels that is actually or potentially of functional significance. The aim of ...this study was to assess the pattern of congenital heart disease. Methods: It was a hospital based Cross-sectional study carried out prospectively in the department of pediatrics of Rajshahi medical college and hospital from July 2011 to December 2011. The study population was all the children up to 12 years of age admitted in three pediatric units of this hospital during the study period.Results: Among the 147 clinically suspected cases congenital heart disease was confirmed in 110 cases by echocardiography. Thrill was mostly present in 60.5% of VSD cases, in 42.1% of PDA, in 50% of A-V canal defect and 10% of multiple lesions patients. Palpable P2 was present in 27.9% of VSD cases, 15% of TOF, 50% of PS and 30% of multiple lesions patients. Left parasternal heave was found in 25.6% of VSD cases, 15.6% of ASD, 88.2% of TOF, 50% of PS and 40% of multiple lesions patients. Cardiomegaly was present in 5.3% of PDA, 50% of COA, 50% of PS and 20% of multiple lesions cases. Plethoric lung field with cardiomegaly & consolidation was observed in 10% of VSD and 21% of PDA cases. Cardiomegaly with consolidation was observed in 11.6% of VSD & 15.6% of ASD cases. Boot shape heart with oligamic lung was observed in 88.2% of TOF patients. Pulmonary opacity/consolidation was found in 4.7% of VSD cases.Conclusions: It appeared that incidence of CHD is quite significant in RMCH.
The roadmap is organized into several thematic sections, outlining current computing challenges, discussing the neuromorphic computing approach, analyzing mature and currently utilized technologies, ...providing an overview of emerging technologies, addressing material challenges, exploring novel computing concepts, and finally examining the maturity level of emerging technologies while determining the next essential steps for their advancement.
Kako bi se automatizirali procesi u internetu stvati, nužno je rezlikovati bitne usluge u moru sličnih kao i identificirati potrebne usluge u pogledu kvalitete usluge (QoS). Kako bi doskočili ovome ...problemu prdlaže se heuristička optimizacija kao robustan i efikasan način rješavajne kompleksnih problema. Nadalje, u članku je predložen postupak kooperativne evolucije za slaganje usluga uz ograničenja u pogledu kvalutete usluge. Predstavljen je niz efektivnih strategija za spomenuti problem uključujući strategije najboljeg prvog i najboljeg globalnog koje unose perturbacije u polazni problem. Simulacijski rezultati kao i stvarni podatci su korišteni u svrhu evaluacije prodloženog algoritma kako bi se osigurala efikasna pretraga uz stabilnost i brzu konvergenciju. Predloženi algoritam tako.er vodi računa o odnosu izme.u različitosti populacije i selekcijskog pritiska kada je potrebno osigurati slaganje usluga na velikoj skali.
Full duplex communication promises a paradigm shift in wireless networks by allowing simultaneous packet transmission and reception within the same channel. While recent prototypes indicate the ...feasibility of this concept, there is a lack of rigorous theoretical development on how full duplex impacts medium access control (MAC) protocols in practical wireless networks. In this paper, we formulate the first analytical model of a CSMA/CA based full duplex MAC protocol for a wireless LAN network composed of an access point serving mobile clients. There are two major contributions of our work: First, our Markov chain-based approach results in closed form expressions of throughput for both the access point and the clients for this new class of networks. Second, our study provides quantitative insights on how much of the classical hidden terminal problem can be mitigated through full duplex. We specifically demonstrate that the improvement in the network throughput is up to 35-40\% over the half duplex case. Our analytical models are verified through packet level simulations in ns-2. Our results also reveal the benefit of full duplex under varying network configuration parameters, such as number of hidden terminals, client density, and contention window size.
This paper adopts a systems approach to study how millimeter wave (mmWave) radio transmitters on UAVs provide high throughput links under typical hovering conditions. With Terragraph channel sounder ...units, we experimentally study the impact of signal fluctuations and sub-optimal beam selection on a testbed involving DJI M600 UAVs. From the hovering-related insights and the measured antenna radiation patterns, we develop and validate the first stochastic UAV-to-Ground mmWave channel model with UAVs as transmitters. Our UAV-centric analytical model complements the classical fading with additional losses expected in the mmWave channel during hovering, considering 3-D antenna configuration and beamforming training parameters. We specifically consider lateral displacement, roll, pitch, and yaw, whose magnitude vary depending on the availability of specialized hardware such as real-time kinematic GPS. We then leverage this model to mitigate the hovering impact on the UAV-to-Ground link by selecting a near-to-optimum pair of beams. Importantly, our work does not change the wireless standard nor require any cross-layer information, making it compatible with current mmWave devices. Results demonstrate that our channel model drops estimation error to <inline-formula><tex-math notation="LaTeX">\approx</tex-math> <mml:math><mml:mo>≈</mml:mo></mml:math><inline-graphic xlink:href="garciasanchez-ieq1-3013575.gif"/> </inline-formula> 0.2 percent, i.e., 18x lower, and improves the average PHY bit-rate by <inline-formula><tex-math notation="LaTeX">\approx</tex-math> <mml:math><mml:mo>≈</mml:mo></mml:math><inline-graphic xlink:href="garciasanchez-ieq2-3013575.gif"/> </inline-formula> 10 percent when compared to existing state-of-the-art channel models and beamforming methods for UAVs.
PDF
