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 202 for “"signal strength"”.
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Real-time localization using received signal strength
… and tracking of wireless devices using radio signal strength (RSS) measurements in an indoor environment is undertaken. This dissertation is presented in the form of five papers.</p><p>The first two papers deal with localization and placement of receivers using a range-based method where the …
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A Single Cell Approach to TCR Signal Strength
… the cytolytic activity of effector CTLs. Signal transduction downstream of the TCR is a highly diverse and coordinated network of post-translational protein modifications that ultimately drive transcriptional, translational, metabolic and cytoskeletal changes in the cell. How cytotoxic T …
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How TCR signal strength controls CTL polarisation for target killing
… a major-histocompatability complex, triggering signalling, inducing the CTL to attach and kill target cells. Key stages in this attack are the initial conjugation followed by polarisation and docking of the centrosome to the junction of the two cells, the immune synapse (IS). This focuses …
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Development and Testing of A Space-borne GPS Signal Strength Sensor
The Global Positioning System (GPS) satellite signals provide not only traditional radionavigation service but inexpensive and convenient radio beacons for signal propagation studies on ionosphere and atmosphere. This thesis describes the development and testing of a specialized GPS sensor which …
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An Optimization Approach to Indoor Location Problem Based on Received Signal Strength
… a low-cost indoor location system using received signal devices. Indoor location through received signal strength (RSS) is of low costs, yet it suffers from poor accuracy due to lack of direct line-of-sight, multi-path ratio propagation, and various interferences. To improve its location …
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Design considerations for an indoor location service using 802.11 wireless signal strength
… of location discovery using 802.11 (Wi-Fi) signals and "organically collected" (i.e. user-generated) received signal strength maps are discussed. Several existing and novel localizer algorithms are compared on a database of organically collected data. Features of local Wi-Fi "signatures" …
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Received Signal Strength-Based Localization of Non-Collaborative Emitters in the Presence of Correlated Shadowing
RSS-based localization is a promising solution for estimating the position of a non-collaborative emitter using a network of collaborative sensors. This paper examines RSS-based localization and differential RSS (DRSS) localization in the presence of correlated shadowing with no knowledge of the …
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An investigation into the viability of using radio signal strength across multiple frequencies for personnel tracking
… mobile network point, and measuring the radio signal strength of the network communications between the mobile and fixed points. This project attempted to improve on this technique by investigating whether additional information and accuracy could be achieved by measuring signal strength over a …
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Efficient localization methods for wireless sensor networks based on received signal strength = Metodos de localizacion eficiente para redes de sensores basados en la medida de la potencia de señal recibida
… measurements of some parameters of the radio signals that receive from their neighboring nodes, such as the Time of Arrival or the Received Signal Strength. Then, these measurements are processed in order to calculate the position of the nodes. Clearly, there is some energy consumption during …
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RF and GIS: Field Strength Prediction for Frequencies between 900 MHz and 28 GHz
This thesis presents a model to predict signal strength for frequencies between 902 MHz and 28 GHz. The model approximates diffraction using the knife-edge concept and equations proposed by Lee (1985). LOS pathways are calculated using the Bresenham algorithm and the corresponding elevations are …
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The thermal boundary conductance between a thin ⁴He film and its substrate
… and a thin 4He film is responsible for the signal strength and the Q of a third sound resonance cell. Careful analysis of the signal strength and Q for films between 1.35 and 4.40 atomic layers shows that the boundary conductance between a thin film and its substrate is three to five orders …
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Radio propagation analysis for improved UAV data muling of surfaced underwater sensor nodes
… We present a mathematical model for predicting signal strength with respect to distance and height using a two-ray propagation model in conjunction with the individual radiation patterns of transmitting and receiving antennas. Signal quality over space is then be used to select best waypoints. …
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Rss Based Localization In A Rayleigh Fading Environment
… level and are capable of measuring the received signal strength in each of the resolved multipath components. An error function is formulated based upon the square of the distances between the actual sensor locations and their model-predicted locations, which are functions of the received signal …
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Using Light Detection and Ranging (LiDAR) Imagery to Model Radio Wave Propagation
… thresholds for transforming continuous signal strength measurements into LOS or non-LOS (NLOS) classifications used in determining prediction accuracy. The capability to transmit information via higher frequency wireless equipment requires a near LOS path between the transmitter and the …
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The use of ESR spectroscopy for the detection of irradiated crustacea with particular reference to Nephrops norvegicus (Norway lobster)
… lobster, has been investigated.<br/><br/>The ESR signal induced in the cuticle of different exoskeleton components of irradiated Norway lobster consisted of the characteristic Mn 2+ spectrum with an additional peak in the centre at 349.5 mT. This peak was radiation-specific as it was not generated …
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Pedestrian traffic monitoring using Wi-Fi technology
… unique MAC address of each device and received signal strength. This thesis described a mobile tracking system for tracking smartphones, based on these extracted information. This system uses sniffing stations which integrate with Wi-Fi devices, 3G devices, processors and sensors to capture the …
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Quantitative analysis of IL-2 and IL-15 signal transduction in T lymphocytes
… differentiation and homeostasis. Both cytokines signal through a heterotrimeric surface receptor complex (IL-2/15R) composed of an [alpha], a [beta], and the common gamma ([gamma]c) chain. Signaling occurs through the shared [beta] and [gamma]c chains, and the a-chains function as high affinity …
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Searching for the Higgs Boson Produced in Association with a Pair of Top Quarks in Multilepton Final States Using the ATLAS Detector at the LHC
… H → ZZ decays. The 3l+1τ channel measured a ttH signal strength of μ = 1.6 (+1.8, -1.3) with an observed (expected) significance of 1.3 (0.9) standard deviations relative to the Standard Model background-only hypothesis. The combined ttH multilepton analysis also found an excess of events above …
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Data analysis of continuous gravitational waves
… on simulated data as well as hardware injected signals of pulsars in the fourth LIGO science run (S4). While with the current sensitivity of our detectors we do not expect to detect any true Gravitational Wave signals in our data, we can still set upper limits on the strength of the …
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