Search
Now showing items 21-30 of 441
Minimizing Residual Vibrations in Flexible Systems
(1992-06-01)
Residual vibrations degrade the performance of many systems. Due to the lightweight and flexible nature of space structures, controlling residual vibrations is especially difficult. Also, systems such as the Space ...
Robust Photo-topography by Fusing Shape-from-Shading and Stereo
(1993-02-01)
Methods for fusing two computer vision methods are discussed and several example algorithms are presented to illustrate the variational method of fusing algorithms. The example algorithms seek to determine planet ...
Shaping Inputs to Reduce Vibration in Flexible Space Structures
(1992-06-01)
Future NASA plans to launch large space strucutres solicit the need for effective vibration control schemes which can solve the unique problems associated with unwanted residual vibration in flexible spacecraft. In ...
Equivalence and Reduction of Hidden Markov Models
(1993-01-01)
This report studies when and why two Hidden Markov Models (HMMs) may represent the same stochastic process. HMMs are characterized in terms of equivalence classes whose elements represent identical stochastic processes. ...
Recognizing 3-D Objects Using 2-D Images
(1993-04-01)
We discuss a strategy for visual recognition by forming groups of salient image features, and then using these groups to index into a data base to find all of the matching groups of model features. We discuss the most ...
A Distributed Model for Mobile Robot Environment-Learning and Navigation
(1990-05-01)
A distributed method for mobile robot navigation, spatial learning, and path planning is presented. It is implemented on a sonar-based physical robot, Toto, consisting of three competence layers: 1) Low-level navigation: ...
Noise Reduction Using Low Weight and Constant Weight Coding Techniques
(1990-05-01)
Signalling off-chip requires significant current. As a result, a chip's power-supply current changes drastically during certain output-bus transitions. These current fluctuations cause a voltage drop between the chip ...
Fat-Tree Routing for Transit
(1990-02-01)
The Transit network provides high-speed, low-latency, fault-tolerant interconnect for high-performance, multiprocessor computers. The basic connection scheme for Transit uses bidelta style, multistage networks to ...
MARVEL: A System for Recognizing World Locations with Stereo Vision
(1990-06-01)
To use a world model, a mobile robot must be able to determine its own position in the world. To support truly autonomous navigation, I present MARVEL, a system that builds and maintains its own models of world locations ...
Parallel Coupled Micro-Macro Actuators
(1996-01-01)
This thesis presents a new actuator system consisting of a micro-actuator and a macro-actuator coupled in parallel via a compliant transmission. The system is called the Parallel Coupled Micro-Macro Actuator, or PaCMMA. ...