scholarly journals Magnetic Field as a Characterization of Wide and Narrow Spaces in a Real Challenging Scenario Using Dynamic Time Warping

2018 ◽  
Author(s):  
Antoni Perez-Navarro ◽  
Raul Montoliu ◽  
Joaquin Torres-Sospedra ◽  
Jordi Conesa
Keyword(s):  
Magnetic Field ◽  
Dynamic Time Warping ◽  
Time Warping ◽  
Dynamic Time

Objective Assessment of Surgical Skills

2012 ◽  
Author(s):  
Jenny A. Cifuentes ◽  
Minh Tu Pham ◽  
Richard Moreau ◽  
Flavio Prieto ◽  
Pierre Boulanger
Keyword(s):  
Dynamic Time Warping ◽  
Objective Assessment ◽  
Standard Technique ◽  
Multidimensional Data ◽  
Time Warping ◽  
Objective Metrics ◽  
Effective Training ◽  
Dynamic Time ◽  
Novice Surgeons

Minimally Invasive Surgery (MIS) has definitively changed the procedures performed in operating rooms. In many cases, MIS has become the recommended standard technique, replacing the traditional open surgery. Effective training and objective assessment of surgeons in these techniques become a major concern in hospitals in recent years, encouraged primarily by patients and a society that demands safer surgical procedures, which is associated with better surgeons training. In the framework of surgery, the difficulty of defining objective metrics for performance evaluation lies in the strict dependency between tasks and the difficulty of defining the meaning of optimal performance, related to the characterization of gestures made by the experts. An objective method to compare 3D gestures between an expert and novice surgeons through multidimensional data analysis is proposed in this paper. A survey of different algorithms for surgical gestures analysis in time domain is carried out. These ones include the Multi-dimensional Dynamic Time Warping (MD-DTW) and Multi-Dimensional Derivative Dynamic Time Warping (MD-DDTW). Simulation and experimental results are given with this different techniques.

scholarly journals A Hybrid Dead Reckon System Based on 3-Dimensional Dynamic Time Warping

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 185 ◽  
Author(s):  
Jian Chen ◽  
Gang Ou ◽  
Ao Peng ◽  
Lingxiang Zheng ◽  
Jianghong Shi
Keyword(s):  
Magnetic Field ◽  
Dynamic Time Warping ◽  
Weighted Least Squares ◽  
Dead Reckoning ◽  
Step Length ◽  
Indoor Positioning ◽  
Time Warping ◽  
Positioning Accuracy ◽  
3 Dimensional ◽  
Dynamic Time

In recent years, using smartphones for indoor positioning has become increasingly popular with consumers. This paper presents an integrated localization technique for inertial and magnetic field sensors to challenge indoor positioning without Wi-Fi signals. For dead-reckoning (DR), attitude angle estimation, step length calculation, and step counting estimation are introduced. Dynamic time warping (DTW) usually calculates the distance between the measured magnetic field and magnetic fingerprint in the database. For DR/Magnetic matching (MM), we creatively propose 3-dimensional dynamic time warping (3DDTW) to calculate the distance. Unlike traditional DTW, 3DDTW extends the original one-dimensional signal to a two-dimensional signal. Finally, the weighted least squares further improves indoor positioning accuracy. In the three different experimental scenarios—teaching building, study room, office building—DR/MM hybrid positioning accuracy is about 3.34 m.

Multichannel sparse spike deconvolution based on dynamic time warping

2021 ◽  
Author(s):  
Xiaowei Zhao ◽  
Shangxu Wang ◽  
Sanyi Yuan ◽  
Liang Cheng ◽  
Youjun Cai
Keyword(s):  
Dynamic Time Warping ◽  
Time Warping ◽  
Dynamic Time
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