Fin Drive Propulsion

2012 ◽  
Author(s):  
Saethor Asgeirsson ◽  
Runar Unnthorsson
Keyword(s):  
Fourier Series ◽  
Numerical Model ◽  
Atlantic Salmon ◽  
Fish Species ◽  
Video Analysis ◽  
Video Recording ◽  
Recording System ◽  
Video Recordings ◽  
Swimming Mode ◽  
Fourier Model

This paper presents the results of a study, which aimed to understand and evaluate the locomotion of Atlantic salmon and Arctic char under three different swimming conditions, slow, medium and fast swimming. A Fourier-series based numerical model that describes the swimming mode for each condition is represented. The numerical model is based on a video analysis of swimming fish. A video recording system was used to record the movement of two fish species under different swimming conditions in a swimming tunnel. The movements of eleven points on the fishes were tracked from the video recordings and logged. The movements of each point were then analyzed in Matlab and a 2nd degree Fourier model constructed to describe the motion.

scholarly journals Progressive tracking: a novel procedure to facilitate manual digitization of videos

Biology Open ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. bio055962
Author(s):  
Maja Mielke ◽  
Peter Aerts ◽  
Chris Van Ginneken ◽  
Sam Van Wassenbergh ◽  
Falk Mielke
Keyword(s):  
Experimental Research ◽  
Video Analysis ◽  
Video Recording ◽  
Input Devices ◽  
Video Recordings ◽  
Points Of Interest ◽  
Video Frames ◽  
Speed And Accuracy ◽  
Present Progressive

ABSTRACTDigitization of video recordings often requires the laborious procedure of manually clicking points of interest on individual video frames. Here, we present progressive tracking, a procedure that facilitates manual digitization of markerless videos. In contrast to existing software, it allows the user to follow points of interest with a cursor in the progressing video, without the need to click. To compare the performance of progressive tracking with the conventional frame-wise tracking, we quantified speed and accuracy of both methods, testing two different input devices (mouse and stylus pen). We show that progressive tracking can be twice as fast as frame-wise tracking while maintaining accuracy, given that playback speed is controlled. Using a stylus pen can increase frame-wise tracking speed. The complementary application of the progressive and frame-wise mode is exemplified on a realistic video recording. This study reveals that progressive tracking can vastly facilitate video analysis in experimental research.

Effects of Time and Perceptual Orientation on Actors' and Observers' Attributions

1984 ◽  
Vol 58 (1) ◽  
pp. 23-30
Author(s):  
Donald S. Martin ◽  
Ming-Shiunn Huang
Keyword(s):  
Video Recording ◽  
Control Group ◽  
Control Groups ◽  
Video Recordings ◽  
Before And After ◽  
Perceptual Orientation ◽  
Initial Difference ◽  
Variety Show ◽  
And Control ◽  
Unrelated Variety

The actor/observer effect was examined by Storms in a 1973 study which manipulated perceptual orientation using video recordings. Storms' study was complex and some of his results equivocal. The present study attempted to recreate the perceptual reorientation effect using a simplified experimental design and an initial difference between actors and observers which was the reverse of the original effect. Female undergraduates performed a motor co-ordination task as actors while watched by observers. Each person made attributions for the actor's behaviour before and after watching a video recording of the performance. For a control group the video recording was of an unrelated variety show excerpt. Actors' initial attributions were less situational than observers'. Both actors and observers became more situational after the video replay but this effect occurred in both experimental and control groups. It was suggested the passage of time between first and second recording of attributions could account for the findings and care should be taken when interpreting Storms' (1973) study and others which did not adequately control for temporal effects.

QUALITATIVE CHANGES IN RHYTHMIC GYMNASTICS HOOP THROWS FROM THE PERSPECTIVE OF BIOMECHANICAL ANALYSIS

2020 ◽  
pp. 1-8
Author(s):  
Raluca Tanasa
Keyword(s):  
Correlation Coefficient ◽  
Video Recording ◽  
Biomechanical Analysis ◽  
Fundamental Groups ◽  
Horizontal Distance ◽  
Video Recordings ◽  
Rhythmic Gymnastics ◽  
Female Gymnasts ◽  
Execution Technique ◽  
Qualitative Changes

Throws and catches in rhythmic gymnastics represent one of the fundamental groups of apparatus actuation. They represent for the hoop actions of great showmanship, but also elements of risk. The purpose of this paper is to improve the throw execution technique through biomechanical analysis in order to increase the performance of female gymnasts in competitions. The subjects of this study were 8 gymnasts aged 9-10 years old, practiced performance Rhythmic Gymnastics. The experiment consisted in video recording and the biomechanical analysis of the element “Hoop throw, step jump and catch”. After processing the video recordings using the Simi Motion software, we have calculated and obtained values concerning: launch height, horizontal distance and throwing angle between the arm and the horizontal. Pursuant to the data obtained, we have designed a series of means to improve the execution technique for the elements comprised within the research and we have implemented them in the training process. Regarding the interpretation of the results, it may be highlighted as follows: height and horizontal distance in this element have values of the correlation coefficient of 0.438 and 0.323, thus a mean significance of 0.005. The values of the arm/horizontal angle have improved for all the gymnasts, the correlation coefficient being 0.931, with a significance of 0.01. As a general conclusion, after the results obtained, it may be stated that the means introduced in the experiment have proven their efficacy, which has led to the optimisation of the execution technique, thus confirming the research hypothesis.

Spatial-temporal variables for swimming coaches: A comparison study between video and TritonWear sensor

2021 ◽  
pp. 174795412110137
Author(s):  
Robin Pla ◽  
Thibaut Ledanois ◽  
Escobar David Simbana ◽  
Anaël Aubry ◽  
Benjamin Tranchard ◽  
...  
Keyword(s):  
Swimming Performance ◽  
Video Recording ◽  
Open Water ◽  
Percentage Error ◽  
Stroke Index ◽  
Wearable Sensor ◽  
Stroke Length ◽  
Video Recordings ◽  
Temporal Variables ◽  
Training Sets

The main aim of this study was to evaluate the validity and the reliability of a swimming sensor to assess swimming performance and spatial-temporal variables. Six international male open-water swimmers completed a protocol which consisted of two training sets: a 6×100m individual medley and a continuous 800 m set in freestyle. Swimmers were equipped with a wearable sensor, the TritonWear to collect automatically spatial-temporal variables: speed, lap time, stroke count (SC), stroke length (SL), stroke rate (SR), and stroke index (SI). Video recordings were added as a “gold-standard” and used to assess the validity and the reliability of the TritonWear sensor. The results show that the sensor provides accurate results in comparison with video recording measurements. A very high accuracy was observed for lap time with a mean absolute percentage error (MAPE) under 5% for each stroke (2.2, 3.2, 3.4, 4.1% for butterfly, backstroke, breaststroke and freestyle respectively) but high error ranges indicate a dependence on swimming technique. Stroke count accuracy was higher for symmetric strokes than for alternate strokes (MAPE: 0, 2.4, 7.1 & 4.9% for butterfly, breaststroke, backstroke & freestyle respectively). The other variables (SL, SR & SI) derived from the SC and the lap time also show good accuracy in all strokes. The wearable sensor provides an accurate real time feedback of spatial-temporal variables in six international open-water swimmers during classical training sets (at low to moderate intensities), which could be a useful tool for coaches, allowing them to monitor training load with no effort.

Neuroendovascular training using multisource video-recording system in a hybrid operating room

2021 ◽  
Author(s):  
Satoshi Koizumi ◽  
Masaaki Shojima ◽  
Shogo Dofuku ◽  
Akira Saito ◽  
Seiji Nomura ◽  
...  
Keyword(s):  
Operating Room ◽  
Video Recording ◽  
Recording System ◽  
Hybrid Operating Room

Digital video recording system using multibeam magneto-optical disk drive

1990 ◽  
Author(s):  
Kazuhiro Yoshihara ◽  
Ryuichi Katayama ◽  
Yutaka Yamanaka ◽  
Masaki Tsunekane ◽  
Yuzo Ono ◽  
...  
Keyword(s):  
Digital Video ◽  
Video Recording ◽  
Disk Drive ◽  
Optical Disk ◽  
Recording System ◽  
Optical Disk Drive

A Comparison of the Application of the SMED Methodology in Two Different Cutting Lines

2021 ◽  
Vol 25 (1) ◽  
pp. 124-149
Author(s):  
Alexandre Silva ◽  
José C. Sá ◽  
Gilberto Santos ◽  
Francisco J.G. Silva ◽  
Luís P. Ferreira ◽  
...  
Keyword(s):  
Data Collection ◽  
Continuous Improvement ◽  
Video Analysis ◽  
Historical Data ◽  
Action Plan ◽  
Video Recording ◽  
Operating Mode ◽  
Added Value ◽  
Output Rate ◽  
Production Output

Purpose: This study was carried out in a cork company and its purpose was to observe and analyze the practices and methods used during the tools/series change moments and to propose improvements and alternatives to these same procedures so that the time needed to carry out the setup is reduced by 15% in both lines. Methodology/Approach:The methodology included the following phases: 1st - historical data collection and setup video recording, 2nd - footage analysis and conduction of informal interviews with employees, 3rd - flow, Gantt, and spaghetti charts creation and making of an action plan based on the waste and improvement opportunities identified in video analysis, 4th - validation with the line workers of the new operating mode created with the Single Minute Exchange of Dies (SMED) tool and communication to the Maintenance department about their role in this project, 5th - making and placement of plasticized cards on the cutting lines to ensure that new operating mode is followed and carrying out the actions identified in the action plan. Findings: Throughout this project using observations, video recording and its subsequent analysis, as well as interviews to the workers operating in the line, it was found the existence of several actions carried out by them during the setups which did not add value to the product, lack of adequate tools for the work to be performed and lack of work tools in general Research Limitation/implication: The study was limited by the lines and products under study and by the duration of the curricular internship, which was about five months. Originality/Value of paper: The article demonstrates the added value in terms of product quality and production output rate that SMED methodology can bring to companies that adopt the lean philosophy and in particular this continuous improvement tool.

scholarly journals FaceSync: Open source framework for recording facial expressions with head-mounted cameras

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 702 ◽  
Author(s):  
Jin Hyun Cheong ◽  
Sawyer Brooks ◽  
Luke J. Chang
Keyword(s):  
Facial Expression ◽  
Open Source ◽  
Facial Expressions ◽  
Video Recording ◽  
Machine Learning Algorithms ◽  
Expression Data ◽  
Video Recordings ◽  
Automated Method ◽  
Open Source Framework ◽  
The Cost

Advances in computer vision and machine learning algorithms have enabled researchers to extract facial expression data from face video recordings with greater ease and speed than standard manual coding methods, which has led to a dramatic increase in the pace of facial expression research. However, there are many limitations in recording facial expressions in laboratory settings.  Conventional video recording setups using webcams, tripod-mounted cameras, or pan-tilt-zoom cameras require making compromises between cost, reliability, and flexibility. As an alternative, we propose the use of a mobile head-mounted camera that can be easily constructed from our open-source instructions and blueprints at a fraction of the cost of conventional setups. The head-mounted camera framework is supported by the open source Python toolbox FaceSync, which provides an automated method for synchronizing videos. We provide four proof-of-concept studies demonstrating the benefits of this recording system in reliably measuring and analyzing facial expressions in diverse experimental setups, including group interaction experiments.

scholarly journals Technological video survaillance as protective tool of smart electricity meters from unauthorized access

2020 ◽  
Vol 2020 (2) ◽  
pp. 7-13
Author(s):  
Oxana Garifullaevna Koispaeva ◽  
Sergey Vladimirovich Golovko ◽  
Maksim Almansurovich Nadeev
Keyword(s):  
Video Surveillance ◽  
Surveillance System ◽  
Information Technologies ◽  
Video Recording ◽  
Video Stream ◽  
Recording System ◽  
Economic Feasibility ◽  
Electrical Networks ◽  
New Information ◽  
Different Types

The article touches upon the problems of interference in the electricity metering system and different types of electricity loss underestimation. It has been stated that in modern conditions the only effective way to identify and prevent violations is to install a remote electricity meter at the borderline of balance and operational responsibilities. РиМ 384.02 smart electricity meter is considered as an example. A picture of the device is presented and its main positive characteristics are listed. It has been proposed to introduce the twenty-four-hour video surveillance and video recording system into an expensive smart electricity meter in order to maintain the integrity and operability of the device. Video stream processing by means of machine vision and machine learning has been proposed. The economic feasibility of digitalization of the technological video surveillance system is being substantiated. The need of optimization of the electrical networks, the improvement of electricity metering system and of introducing the new information technologies in energy sales has been substantiated

scholarly journals Video Recording Made Easy: Applications for Gateway Library's One Button Studion

2014 ◽  
Vol 6 ◽  
Author(s):  
Jason Byrd ◽  
Todd Stafford ◽  
Royce Gildersleeve ◽  
Christal Ferrance ◽  
Kara Kiblinger
Keyword(s):  
Media Literacy ◽  
Video Recording ◽  
Video Recordings ◽  
Course Objectives ◽  
Amount Of Knowledge

Learn how easy video recording can be with the new OneButton Studio, located in Gateway Library. Presenters will share how this studio drastically reduces the amount of knowledge necessary to make professional video recordings and discuss applications in courses, including flipping the classroom, adding media literacy components to course objectives, and incorporating video recordings into assignments.

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