Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 68 for “"Loss Model"”.
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Power of d choices for large-scale bin packing: a loss model
… d 2 randomly chosen servers. We consider a fluid model that corresponds to the limit as N goes to infinity, and use numerical methods to approximate the blocking probability. Moreover, we also show the simulation for the system.
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A Grid based Indoor Radiolocation Technique Based on Spatially Coherent Path Loss Model
… technique based on a Spatially Coherent Path Loss Model (SCPL). SCPL is a path loss model which characterizes the radio wave propagation in an environment by solely using Received Signal Strength (RSS) fingerprints. The propagation of the radio waves is characterized by uniformly dividing the …
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A Plug-in Hybrid Electric Vehicle Loss Model to Compare Well-to-Wheel Energy Use from Multiple Sources
… availability is often used with sophisticated models to simulate powertrain operation. A simple method of evaluating technologies, component sizes, and alternative fuels is the goal of the model presented here. The objective of this paper is to define a PHEV model for use in the EcoCAR …
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Voice Call Capacity Over Wireless Mesh Networks
… based ad hoc network. We begin with the modelling of conversational speech and define a six state semi-Markov voice model based on ITU-T P59 recommendation. We perform a theoretical analysis of the voice model and compare it with results obtained via simulations. Using a Java based IEEE …
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Design of an energy-efficient geographic routing protocol for mobile ad-hoc networks
… Ad-hoc networks and hence cope with dynamic path loss conditions, it is apparent that research and development of energy efficient geographic routing protocols is of great importance. Therefore various mobile Ad-hoc routing protocols have been studied for their different approaches. Forwarding …
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Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… work are two-folds. First, in order to build a model, extensive field strength measurements are carried out inside two different buildings. Then, path loss exponents from log-distance path loss model and standard deviations from log-normal shadowing, which statistically describe the path loss …
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Energy loss and theoretical uncertainties in small quark-gluon plasmas
… is to systematically improve current energy loss models, particularly in how they pertain to small systems. We present a perturbative Quantum Chromodynamics (pQCD) based energy loss model which receives small system size corrections to both the radiative and elastic energy loss, and which …
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High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC
… CLLC resonant converter in terms of switching loss and conduction loss point of view. CLLC holds ZVS capability over all load range and smaller turn off current value. This is beneficial for high frequency operation and taken as our candidate. Device loss breakdown of CLLC converter is also …
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An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems
… streamline curvature (SLC) throughflow numerical model was assessed and modified to better approximate the flow fields of highly transonic fans typical of military fighter applications. Specifically, improvements in total pressure loss modeling were implemented to ensure accurate and reliable …
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Remote Sensing-based Channel Modeling and Deployment Planning for Low-power Wireless Networks
… affect low power wireless communication; ii) model the relation between such characteristics and the communication quality; and iii) exploit this knowledge to support the deployment planning. We focus on two main scenarios: a) the deployment of Wireless Sensor Networks (WSNs) in forests; and …
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Flow losses in supersonic compressor cascades
Loss models used in compression system performance prediction codes are often developed from the study of two-dimensional cascades. The physical mechanisms that affect the flow in supersonic compressor cascades have been reviewed, including the changes in shock geometry that will occur with back …
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Device Selection Criteria--Based on Loss Modeling and Figure of Merit
… have the best performance and lead to the lowest loss for this device in the circuit. Qgd*Rdson is a widely accepted and widely used FOM for power devices. Due to the lack of accuracy of the power loss model, this FOM is no longer suitable for VRM applications. Furthermore, the question of how to …
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Validation of the ITU-R P series radio wave propagation model for millimetre wave V-Band (60GHz) line-of-sight point-to-point short distance link
… confirm a strong correlation between path-loss and the impact of rain and atmospheric gases as predicted by the ITU path-loss model but also highlight a discrepancy. Further analysis revealed that rain duration appears to be having a detrimental effect on link performance. The experimental …
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Reproducing the line-shape of a Doppler-broadened Gamma-line in 10Be following the beta-decay of 11Li using Geant4
… and precise control over the kinetic energy loss per simulation step. This implementation of DSAM is built for the use of an upcoming experiment investigating the nuclear structure and decay scheme of \atom{11}{}{Li}{}{}. Validation of the DSAM implementation used data from a previous …
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Investigation of Indoor Propagation Algorithms for Localization Purposes: Simulation and Measurements of Indoor Propagation Algorithms for Localization Applications using Wall Correction Factors, Local Mean Power Estimation and Ray Tracing Validations
… mean power estimation, proposing new indoor path loss model and introducing a case study on 60 GHz propagation in indoor environments using ray tracing and measurements. A summary of propagation mechanisms and manifestations in the indoor environment is presented. This comprises the indoor …
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MOSFET Current Source Gate Drivers and Topologies for High Efficiency and High Frequency Voltage Regulator Modules
… The first contribution is an accurate analytical loss model of a power MOSFET with a Current-Source Driver (CSD). The impact of the parasitic components is investigated. Based on the proposed loss model, a general method to optimize the CSD is presented. With the proposed optimization method, the …
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Digital Control for Dynamic Efficiency Optimization in Switching Regulators
… leverages opportunities to minimize power loss and adaptively optimize switching regulator efficiency as the operating conditions change. This thesis details the development of an optimization system that dynamically optimizes the efficiency of a targeted converter. The optimization system …
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Modeling, Implementation, and Simulation of Two-Winding Plate Inductor
… are studied in this dissertation in order to model the self-inductance, winding loss, and core loss. The most challenging task for the plate-core inductor is to model the magnetic field with finite core dimensions, very non-uniform flux pattern, and large fringing flux. The winding is placed …
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Identification and Evaluation of Loss and Deviation Models for use in Transonic Compressor Stage Performance Prediction
… These correlations specify pressure loss and flow turning caused by the blades. Current open literature correlations used in streamline curvature codes are inadequate for general application to high-speed transonic axial-flow compressors. The objective of this research was to …
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Rotordynamic analysis of circumferentially grooved annular pump seals with turbulent flow and inlet swirl
… used in turbopumps. The flow in the groove is modelled using turbulent shear layer theory and an entrance loss model is applied at the inlet and land regions of the seal. The governing equations are derived using Hirs’ turbulent lubrication theory. The equations are expanded to yield zeroth and …
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