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 55 for “"look-up table"”.
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Accelerator-based look-up table for coarse-grained molecular dynamics computations
… using a GPU to investigate the achievable speed-up in comparison to the CPU algorithm. To achieve this, a parallel version of the sequential force routine, i.e. the computation of the energy, force and torque per molecule, was developed and implemented on a GPU. The GPU-accelerated FEFI package …
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Prosthesis control using a nearest neighbor electromyographic pattern classifier
… There were five vectors for each class in the look-up table. The nearest neighbor pattern classifier was compared to a minimum error rate Bayes classifier under the assumption that the probability densities were distributed as a multivariate normal distribution. Comparable error rates were …
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Delay Analysis of Digital Circuits Using Prony's Method
… in DTA(Dynamic Timing Analysis) and delay look-up table in STA(Static Timing Analysis). Given some equally spaced output values, the traditional Prony's method can be used to extract poles and residues of a linear system, i.e. to characterize a waveform using an exponential function. In …
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New architecture for RF power amplifier linearization
… adaptive algorithm and convergence issues in the look-up table training has limited its application in handset devices. Predistortion using a [delta sigma] modulator presented in this work eliminates these problems as it is based on open-loop look-up table training and does not require adaptive …
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Dual energy image reconstruction and systems for application in proton therapy treatment planning
… then converted to SPR via an empirically derived look-up table. If the patient tissues do not have a similar chemical composition to the materials used to generated the look-up table, this approach can lead to diminished dose calculation accuracy. As a result, the patient may experience increased …
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On-Board Orbit Determination and 3-Axis Attitude Determination for Picosatellite Applications
… propagator, magnetometers with a magnetic field look-up table, Sun sensors with an analytic Sun direction model, and the TRIAD method to combine vector observations into attitude information. The orbit propagator is a simple model of a circular trajectory with several frequently updated …
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Adaptive tuned vibration absorber
… a stepper motor. The control algorithm uses a look-up table and a gradient search to optimize the effectiveness of the absorber for vibration reduction on the primary structure. The look-up table uses an equation, based on experimental data, to transform a given voltage input, directly …
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Innovative color management methods for RGB printing
… The process includes two steps: the creation of look-up table using a characterization data set, and image color compensation in conjunction with Windows printing architecture. Several types of correction models for determining printer characterization were proposed and evaluated, including …
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Novel predistortion techniques for RF power amplifiers
… novel predistortion, which combines digital LUT (Look-up Table) and injection. These techniques are applied to both two-tone tests and 16 QAM (Quadrature Amplitude Modulation) signals. The test power amplifiers vary from class A, inverse class E, to cascaded amplifier systems. Our experiments have …
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BER-optimal analog-to-digital converters for communication links
… this corresponds to a power reduction by 2x. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45 nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the …
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Soft, round, high resolution tactile fingertip sensors for dexterous robotic manipulation
… a neighborhood and location based continuous look-up table to map the relationship between RGB value and surface normal orientation of the membrane at a point. Finally we perform two dexterous manipulation task with feedback from the sensors in the form of controlled rolling of an object on a …
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Development of Color Ratio Thin Filament Pyrometry Approach for Applications in High Speed Flames
… assumed graybody radiation spectrum to form a look up table between color ratio and temperature. Interpolated filament temperatures are then corrected for radiation losses via an energy balance to determine the flame temperature. Verification of the technique was performed on the Holthuis and …
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Frequency Scan–Based Mitigation Approach of Subsynchronous Control Interaction in Type-3 Wind Turbines
… damage equipment within the wind farm and disrupt power generation. This work explores the types of SSCI and the various analysis methods as well as mitigation of SSCI. The work expands on the concept of frequency scan to be able to use it in an on-line setting with its output data used to …
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Robust controller design for active trailer steering systems of articulated vehicles using multi-objective optimization
… a framework to generate a multi-dimensional look-up table using the multi-objective evolutionary algorithm for a general dynamic system controlled by a feedback controller. The optimized look-up system can be used to improve the robustness of control systems in real-world applications.
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… feedback path, a two-dimensional, digital look-up table (2-D LUT) adapted by complex gradient-descent algorithms compensates the I/Q mismatch and memoryless nonlinearities of the whole transmit path, including the severe amplitude and phase distortions of the on-chip PA. Fifth-order …
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A methodology for centrifugal compressor stability prediction
The stable operation of centrifugal compressors is limited by well-known phenomena, rotating stall and surge. Although the manifestation of the full scale instabilities is similar to the ones observed in axial machines, the stall inception in centrifugal compressors is less well understood. This …
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Optimizing terminal conditions using geometric guidance for low-control authority munitions
… intensive, it produces an efficient look up table which is easily implemented in real time with minimal additional memory requirements. The thesis further shows that performance improvements are gained by altering the rocket ignition time in flight, by tightening the tolerances on …
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Machine Learning Simulation: Torso Dynamics of Robotic Biped
… of dynamic bipedal walker models are highly coupled and non-linear, making the selection of an appropriate control scheme difficult. A temporal difference reinforcement learning method known as Q-learning develops complex control policies through environmental exploration and exploitation. As a …
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A DSP based variable-speed induction motor drive for a revolving stage
… conditions for safe and agreeable operation, a look-up table, which is used to give command voltage and speed signals in software, is applied to limit the maximum speed and acceleration of the revolving stage. Meanwhile, a boost voltage signal is added at the low frequency areas to make the …
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A pseudo-optimal control approach for a redundant degree-of-freedom in a gimbaled mechanical system
… a variety of nominal conditions and stored in a look-up table. The classical and LQR controllers, as well as models of the four gimbal system components and sensors, are evaluated strictly via simulation. Metrics for determining controller performance are defined and a search is made for …
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