scholarly journals Geodesic-Based Method for Improving Matching Efficiency of Underwater Terrain Matching Navigation

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2709 ◽  
Author(s):  
Zhaowei Li ◽  
Wei Zheng ◽  
Fan Wu
Keyword(s):  
Attitude Control ◽  
Spherical Geometry ◽  
Parameter Setting ◽  
Matching Accuracy ◽  
Shortest Arc ◽  
Matching Efficiency ◽  
The Law ◽  
Terrain Matching

In this study, we improved the matching efficiency of underwater terrain matching navigation. Firstly, a new geodesic-based method was developed by combining the law of the shortest arc in spherical geometry with the theory of the attitude control in space and maritime environments. Secondly, along a design track, the geodesic-based method helped reduce the radius of the search matching area, and improved the matching efficiency. Finally, for parameter setting, the search matching time of underwater terrain matching navigation was reduced from 9.84 s to 1.29 s (about 7.6 times), with the matching accuracy being invariable using the new geodesic-based method.

Integrator Back-Stepping Algorithm on Attitude Control of Quadrotor Helicopter Based on Disturbance Observer

2014 ◽  
Vol 926-930 ◽  
pp. 1370-1373
Author(s):  
Guo Dong Jin ◽  
Li Bin Lu ◽  
Xiao Fei Zhu ◽  
Juan Liang
Keyword(s):  
Real Time ◽  
Attitude Control ◽  
Disturbance Observer ◽  
External Disturbance ◽  
Time Estimation ◽  
External Interference ◽  
Quadrotor Helicopter ◽  
Real Time Estimation ◽  
The Law ◽  
Back Stepping Control

When quadrotor helicopter was in the process of attitude control, it would often have the serious problem of external interference. So disturbance observer was designed to realize real-time estimation of disturbing moment. In this case, adaptive regime is introduced to the law of integrator back-Stepping control. And experiments were made to verify the algorithm. The experiments show that the algorithm could cope with a certain range of external disturbance, and made significant improve in its accuracy and robustness.

Research on the Algorithm of Image Matching Based on Improved SIFT

2014 ◽  
Vol 686 ◽  
pp. 348-353
Author(s):  
Xiang Chen Qiao
Keyword(s):  
Image Matching ◽  
Euclidean Distance ◽  
Layout Optimization ◽  
Image Stitching ◽  
Matching Method ◽  
Matching Accuracy ◽  
Sift Algorithm ◽  
Matching Efficiency ◽  
Basic Characteristics

The paper analyze and improve the SIFT optimized algorithm, and proposes an image matching method for SIFT algorithm based on quasi Euclidean distance and KD-tree. Experiments show that this algorithm has matching more points, high matching accuracy, no repeated points and higher advantage of matching efficiency based on keeping the basic characteristics of SIFT algorithm unchanged, and provides precise matching point to generate precise image stitching and other related fields of the follow-up product. At the same time, this method was applied to the layout optimization and achieved good results.

Ethical Challenges: Less About Moral Wrongdoing and More About Communication Breakdown

2015 ◽  
Vol 20 (3) ◽  
pp. 72-84 ◽  
Author(s):  
Paula Leslie ◽  
Mary Casper
Keyword(s):  
Ethical Challenges ◽  
Speech Language Pathology ◽  
Thickened Liquids ◽  
Communication Breakdown ◽  
Professional Duty ◽  
Language Pathology ◽  
The Law ◽  
Personal Case

“My patient refuses thickened liquids, should I discharge them from my caseload?” A version of this question appears at least weekly on the American Speech-Language-Hearing Association's Community pages. People talk of respecting the patient's right to be non-compliant with speech-language pathology recommendations. We challenge use of the word “respect” and calling a patient “non-compliant” in the same sentence: does use of the latter term preclude the former? In this article we will share our reflections on why we are interested in these so called “ethical challenges” from a personal case level to what our professional duty requires of us. Our proposal is that the problems that we encounter are less to do with ethical or moral puzzles and usually due to inadequate communication. We will outline resources that clinicians may use to support their work from what seems to be a straightforward case to those that are mired in complexity. And we will tackle fears and facts regarding litigation and the law.

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