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 18 of 18 for “"Adaptive technique"”.
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An adaptive technique for a redundant-sensor navigation system.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1972.
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Adaptive technique for energy management in wireless sensor networks. Development, simulation and evaluation of adaptive techniques for energy efficient routing protocols applied to cluster based wireless sensor networks.
… network¿s lifespan. This thesis presents dynamic techniques to adapt to network changes, through which the limited critical energy source can be wisely managed so that the WSN application can achieve its intended design goals. Two approaches have been taken to decreasing the energy use. The first …
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Adaptive technique for energy management in wireless sensor networks. Development, simulation and evaluation of adaptive techniques for energy efficient routing protocols applied to cluster based wireless sensor networks.
… network¿s lifespan. This thesis presents dynamic techniques to adapt to network changes, through which the limited critical energy source can be wisely managed so that the WSN application can achieve its intended design goals. Two approaches have been taken to decreasing the energy use. The first …
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Investigation of Different Video Compression Schemes Using Neural Networks
… has resulted in the development of various techniques including transform coding, vector quantization and neural networks. this thesis neural network based methods are investigated to achieve good compression ratios while maintaining the image quality. Parts of this investigation include …
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Data adaptive velocity/depth spectra estimation in seismic wide angle reflection analysis
… is the velocity structure of the medium. Techniques used to determine the velocity structure commonly involve multi-channel arrays which measure the spatial as well as the time structure of the returning signals. The application of a data adaptive technique, the Maximum Likelihood Method, …
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Contribution to web-based conjoint analysis for market research
… to perform conjoint analysis, a market research technique based on comparisons between pairs of potential product configurations to compute the perceived relative utility of each of several product design attributes. We first overview conjoint analysis and the online market research industry in …
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Adaptive Energy Management Scheme in Real-Time Energy Harvesting Embedded Systems
… purpose of this thesis was to develop an online adaptive energy management scheme for energy harvesting embedded systems. Two energy prediction schemes were used, namely Exponentially Weighted Moving Average (EWMA) and Adaptive Forward Prediction (AFP), to schedule all the tasks with least …
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Neural Network Enhancement of Closed-Loop Controllers for Ill-Modeled Systems with Unknown Nonlinearities
… the performance of the closed-loop system, an adaptive technique, using a neural network, was developed. A neural network is placed in series between the output of the fixed-gain controller and the input into the plant. The weights are initialized to values that result in a unity gain across …
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Physical controls on copepod aggregations in the Gulf of Maine
… from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an attempt to quantify the spreading of a patch of copepods, and is found to be …
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Adaptive Compression Algorithm For Full Colour Three Dimensional Integral Images
… exploit this coiTelation effect the compression technique is based around the three dimensional Discrete Cosine Transform. To enable accurate compression and de-compression of image data, the scanned image must be aligned coiTcctly to take advantage of the inherent structure imposed by the image …
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Dynamic Neural Network-based Adaptive Inverse Optimal Control Design
… a Dynamical Neural Network (DNN) model based adaptive inverse optimal control design for a class of nonlinear systems. A DNN structure is developed and stabilized based on a control Lyapunov function (CLF). The CLF must satisfy the partial Hamilton Jacobi-Bellman (HJB) equation to solve the …
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Adaptive Detection of Beta Bursts of Local Field Potentials Recorded from Subthalamic Nucleus in Patients with Parkinson’s Disease
… medication and stimulation of the brain. A novel adaptive technique we developed uses local cosine packets to detect beta bursts in LFPs and segments the data appropriately using nondyadic segmentation. We show that the spectral entropy of these adaptively captured bursts previse patient symptoms …
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Physical controls on copepod aggregations in the Gulf of Maine
… from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an attempt to quantify the spreading of a patch of copepods, and is found to be …
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Adaptive Pre-Distort.ion for Laser Diodes with Direct Modulation Frequencies up to 1 GHz
… television. Unfortunately, device fabrication techniques that minimize the non-linear characteristics of a light source can increase per-unit costs and prohibit optical technologies from application in general distribution systems. It is, therefore, desirable to explore linearization techniques …
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AUTOMATIC TUNING OF PROCESS CONTROLLERS : PRACTICAL APPROACHES
… are particularly useful in the context of adaptive control and auto-tuning where the controller parameters have to be computed on-line. Unlike other analytical formulas, the desired system performance as well as robustness can be set by users through gain and phase margin specifications. A …
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Optimal filters for deconvolution of transient signals in the presence of noise
… the deconvolution of time domain signals. The techniques developed in this work are frequency domain filtering techniques. and are suitable for the type of deconvolution problems encountered in time domain reflectometry (TOR). They include a smoothing technique that is a variant of the well …
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Fast blind adaptive equalisation for multiuser CDMA systems
… interference (MAI). In order to achieve this, adaptive filters are employed. A variety of adaptive schemes to remove ISI and MAI have been reported in the literature, some of which rely on training sequences, such as the Least Mean Squares (LMS) and Recursive Least Squares (RLS) algorithms, or …
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Neural network based adaptive control for autonomous flight of fixed wing unmanned aerial vehicles
… flight control system is to use the intelligent adaptive control techniques that provide online learning capability to cope with varying dynamics and disturbances. Neural network based indirect adaptive control strategy is applied for the current work. The two main components of the adaptive …