In this paper, we describe an open-ended robot design exercise that focuses on the design process. Students are tasked with defining a set of objectives, developing a solution strategy and constructing a final system....
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Game environments provide a good domain for serious simulations such as those used in training Navy conning officers. Currently, a typical training scenario requires multiple personnel to play each of the boats and th...
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ISBN:
(纸本)1424404649
Game environments provide a good domain for serious simulations such as those used in training Navy conning officers. Currently, a typical training scenario requires multiple personnel to play each of the boats and thus is expensive. We propose an approach to addressing this issue by developing intelligent, autonomous controllers for each boat. Significant challenges toward achieving these goals are the realism of behavior exhibited by the automated boats and their real-time response to change. In this paper we describe a control architecture that enables the real-time response of boats and the repertoire of realistic behaviors we developed for this application. We demonstrate the capabilities of our system with experimental results.
A new algorithm for redundancy resolution to an autonomous underwater vehicle-manipulator system (UVMS) is proposed. The algorithm explore the benefits of using a reactive neural network architecture to impose desired...
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A new algorithm for redundancy resolution to an autonomous underwater vehicle-manipulator system (UVMS) is proposed. The algorithm explore the benefits of using a reactive neural network architecture to impose desired motions to a virtual kinematic chain. The computer simulation results demonstrate the beneficial characteristics of our proposed method
We present an approach, which uses the sonar data from a commercial off the shelf forward Looking Sonar ( FLS ) sensor used in AUVs. We consider a single beam 2D sonar (namely Micron sonar from Tritech International L...
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We present an approach, which uses the sonar data from a commercial off the shelf forward Looking Sonar ( FLS ) sensor used in AUVs. We consider a single beam 2D sonar (namely Micron sonar from Tritech International Ltd.) and the data recorded is in SeaNet Protocol. The data represented under SeaNet logs for the sonar are interpreted in real time for distance computation of the obstacles present in the environment observed. This approach can also help us to find the nearest obstacle in any direction and it is giving us an important tool, which can be used for the navigation of an AUV. Further, the description of the environment containing the obstacles is presented with the help of images, which are reconstructed using the SeaNet log data using OpenGL.
Wearable accelerometry provides easily portable systems that supply real-time data adequate for gait analysis. When they do not provide direct measurement of a spatio-temporal parameter of interest, such as step lengt...
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Wearable accelerometry provides easily portable systems that supply real-time data adequate for gait analysis. When they do not provide direct measurement of a spatio-temporal parameter of interest, such as step length, it has to be estimated with a mathematical model from indirect sensor measurements. In this work we are concerned with the accelerometry-based estimation of the step length in straight line human walking. We compare five step length estimators. Measurements were taken from a group of four adult men, adding up a total of 800 m per individual of walking data. Also modifications to these estimators are proposed, based on biomechanical considerations. Results show that this modifications lead to improvements of interest over previous methods
Fuzzy logic is widely used for mobile robot navigation. The main draw back of this approach is the ad hoc design of the controllers used. A popular method for the optimization of fuzzy logic controllers for the naviga...
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Fuzzy logic is widely used for mobile robot navigation. The main draw back of this approach is the ad hoc design of the controllers used. A popular method for the optimization of fuzzy logic controllers for the navigation of mobile robots is the use of genetic algorithms. An issue, in this procedure is the selection of the fitness function for the improvement of the behavior of a pre-designed controller. We analyze the factors that influence the evolution of the fuzzy controller based on the fitness function used and present some preliminary results. In order to validate our approach a test bed has been developed based in a low cost robot
Basic processes for nanorobotic manipulation of carbon nanotubes (CNTs) inside a transmission electron microscope are investigated experimentally. These processes are fundamental for the characterization of nanoscale ...
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An energetic approach for analysis of the impact problem in three dimensional multi-legged robot locomotion is hereby presented. The goal is to combine rigid and deformable body approaches which come together naturall...
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An energetic approach for analysis of the impact problem in three dimensional multi-legged robot locomotion is hereby presented. The goal is to combine rigid and deformable body approaches which come together naturally in a work-energy framework. The proposed hybrid approach can predict both rebound and non-rebound for an energetic coefficient of restitution greater than zero. Zero tangential velocity in the impacting end effectors can be also predicted, a condition known as sticking. The paper presents a method for determining whether the level of compliance in the system at a given configuration is adequate to insure a no-slip, no-rebound impact
In this paper we describe a procedure that exploits geometric properties of state space in the investigation of the system stability. Although this method is cumbersome, its practical value becomes clear in the situat...
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In this paper we describe a procedure that exploits geometric properties of state space in the investigation of the system stability. Although this method is cumbersome, its practical value becomes clear in the situation when state space is reduced to a phase plane, which is the case in a second-order system. Then phase plane analysis offers well known procedures (especially in case f(.) is linear) for the determination of the system stability. Simulation results, obtained by implementation of the proposed method on the fuzzy controller design, are given at the end of the paper
Contrast enhancement has an important role in image processing applications. Conventional contrast enhancement techniques either fail to produce satisfactory results for a broad variety of low-contrast images, or cann...
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Contrast enhancement has an important role in image processing applications. Conventional contrast enhancement techniques either fail to produce satisfactory results for a broad variety of low-contrast images, or cannot be automatically applied to different images, because their parameters must be specified manually to produce a satisfactory result for a given image. This paper describes a new automatic method for contrast enhancement. The basic procedure is to first group the histogram components of a low-contrast image into the proper number of bins according to a selected criterion, then redistribute these bins uniformly over the grayscale, and finally ungroup the previously grouped gray-levels. Accordingly, this new technique is named gray-level grouping (GLG). GLG not only produces results superior to conventional contrast enhancement techniques, but is also fully automatic in most circumstances, and is applicable to a broad variety of images
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