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 53 for “"steerable"”.
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Steerable Alignment with Conditional Multiobjective Preference Optimization
… a novel alignment strategy that trains a user-steerable LLM along multiple attributes of text, such as helpfulness and humor. CMPO simulates the pareto front of multiple single-attribute preference-optimized models through structural plurality and finetuning with Direct Preference Optimzation …
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Controlling coupling in an electrically steerable parasitic array
ESPAR antennas can direct radiation and steer nulls by using variable passive elements like varactors, avoiding the cost and complexity of devices like phase shifters. Past attempts to design multi-band ESPARs have often superimposed multiple antenna arrays, each scaled for a different frequency …
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Steerable filters and local analysis of image structure
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Architecture, 1992.
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Implementation of Separable & Steerable Gaussian Smoothers on an FPGA
… filters having these properties are called "Steerable Filters." This thesis work emphasis is on the implementation of proposed computationally efficient separable and steerable Gaussian smoothers on a Xilinx VirtexII Pro FPGA platform. FPGAs are Field Programmable Gate Arrays which consist of …
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Development and Testing of a Steerable Cruciform Parachute System
… this thesis has advanced the development of the steerable cruciform parachute system beyond the point of simply being a feasibility demonstrator. The vertical wind tunnel experiments demonstrated that the system heading could be stabilized and subsequent navigation experiments demonstrated that …
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NUCARS Modeling of a Freight Locomotive with Steerable Trucks
… a six-axle freight locomotive equipped with steerable trucks. This includes separating it into a set of individual bodies, representing the suspension components as inter-body connections, and validation of the computer model. This model is then used to conduct a study of the impact on …
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Adaptive beamforming of steerable array monopole antenna for WLAN application
… the transmitter and receiver. Therefore, a smart steerable patter array antenna is highly recommended for new generation communication. Using low-cost steerable passive monopole array antenna can achieve a beam steering and high gain. Loading an additional reactance to the passive elements of the …
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Beam-Steerable and Reconfigurable Reflectarray Antennas for High Gain Space Applications
Reflectarray antennas uniquely combine the advantages of parabolic reflectors and phased array antennas. Comprised of planar structures similar to phased arrays and utilizing quasi-optical excitation similar to parabolic reflectors, reflectarray antennas provide beam steering without the need of …
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Design of an Ultrasound-Guided Steerable Robotic Catheter for Aortic Interventions
… small puncture in the femoral artery to insert a steerable catheter, and real time x-ray imaging provides guidance as the surgeon maneuvers it to a target site. A variety of interventional devices, such as stents, grafts, and coils can then be delivered through a catheter to reach the treatment …
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Computational Design of the Electrical and Mechanical Performance of Steerable MEMS Antennas
… by a micro-electromechanical system (MEMS). The steerable MEMS antenna of this work was comprised of a planar antenna on top of a Silicon membrane. The membrane is etched to create a gimbal hinge structure and a platform which supported the antenna and gave it one or two degrees of freedom of …
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Design and Analysis of an Electronically Steerable Microstrip Patch and a Novel Coplanar Waveguide (CpW) Fed Slot Antenna Array
<p>Conformal Phased Array Antennas (CPAAs) are very attractive for their high gain, low profile, and beam scanning ability while being conformal to their mounting surface. Among them are microstrip patch phased arrays and wideband slot phased arrays which are of particular significance.</p> <p>In …
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Design, analysis, application and experimental assessment of algorithms for the synthesis of maximally sparse, planar, non-superdirective and steerable arrays
… of synthesizing planar, maximally sparse, steerable and non-superdirective array antennas by means of convex optimization algorithms and testing their performances on an existing array to assess its far field performances in terms of requirements ful- filment. The reason behind the choice …
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Statistical analysis and transfer of coarse-grain pictorial style
… a multi-scale and oriented decomposition, the steerable pyramid. We show that the average of the absolute steerable coefficients as a function of scale characterizes simple notions of "look" or style. We extend this approach to account for image non-stationarity, that is, we capture and …
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Enhancing the energy efficiency of ultra wideband (UWB) based media access control (MAC) protocols in mobile ad-hoc networks (MANETs) through the use of steerable directional antenna
Energy efficiency contributes to the survival of nodes in Mobile Ad Hoc Networks (MANETs). The use of directional antennas can conserve energy due to the increased gain and directed transmission towards specific point in space. Directional antennas also resolve many issues associated with …
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DISTRIBUTED PHASED ARRAY ANTENNAS IN WIDE AREA RFID
… explored by modelling a hypothetical perfectly steerable antenna array. The concept of using perfectly steerable arrays is further explored to propose a cell-less RFID system, in which cell allocation in wide area RFID is replaced with a tag location-based interrogation requiring the global …
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Deriving a Closed-Form Solution for Over-Actuated Surface Vessels with Actuator Constraints
… force vector among multiple independently steerable thrusters without violating actuator constraints. Conventional methods either solve a constrained optimization at every control step—incurring variable computational load—or apply pseudo-inverse heuristics that risk constraint violations. …
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Vibration Extraction Using Rolling Shutter Cameras
… video for vibration extraction is with the Steerable Pyramid in a motion magnification framework. However, the Shearlet transform is well localized in scale, location and orientation, and hence better suited to vibration extraction than the Steerable Pyramid used in the high speed video …
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High-efficiency Waveguide Tunable Leaky-wave Antennas and Phase-shifters
… the radiation efficiency of leaky-wave beam-steerable antennas. In this effort, both frequency and fixed frequency scanned leaky-wave antennas are considered. Specifically, we discuss the design and implementation of a slow-wave frequency-scanned leaky-wave antenna that can achieve a high …
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Generalização de transformadas do cosseno baseada em rotações : contribuições teóricas e cenários de aplicação
… (3D-SDCT, do inglês three-dimensional steerable discrete cosine transform). Um método de compressão de imagens tridimensionais baseado na 3D-SDCT é apresentado; os resultados obtidos superam aqueles conseguidos empregando a 3D-DCT (utilizando a mesma estratégia de quantização e …
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