A novel method of measuring spatial rotation angle using MEMS tilt sensors

This paper presents a novel method to control a robot arm based on the human skeletal information. First, the depth data is obtained by using a Kinect device. Skeletal tracking technology is used to deal with the depth data to match the various parts of the body and the 3D coordinates of each joint of the body are established. Then, the 3D coordinates are proposed to calculate the rotation angle of the human waist, shoulder, elbow and wrist joints. These four joints of the body are one-to-one correspondence with the four joints of 4-DOF robot arm. Finally, a transformation is conducted to map the calculation results into control commands, and the control commands are sent to the controller of robot arm by serial ports to achieve body feeling interaction. The experimental results show that the method can effectively control the robot arm to rotate and grab objects.

Download Full-text

Estimation of Instantaneous Hand Joint Centers of Rotation Using 3D Reconstructed Hand Skeleton Motion from CT Scans

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/1541931218621154 ◽

2018 ◽

Vol 62 (1) ◽

pp. 681-685

Author(s):

Xiaopeng Yang ◽

Zhichan Lim ◽

Hayoung Jung ◽

Wonsup Lee ◽

Heecheon You

Keyword(s):

Ct Scan ◽

Rotation Angle ◽

Index Finger ◽

Ct Scans ◽

Hand Posture ◽

Distal Interphalangeal ◽

Novel Method ◽

Better Than

The present study estimated instantaneous hand joint centers of rotation (CoR) using 3D reconstructed hand skeleton motions captured from CT scan. We proposed a novel method for estimation of instantaneous joint CoR using the same bone surfaces for different hand postures. Each bone in a template hand posture was registered to the corresponding bone of different hand postures. The registered hand postures (having the same bone surfaces as the template hand posture but different postures) with the template hand posture were then used for estimation of instantaneous joint CoR. The proposed method performed better than the existing methods in estimation of instantaneous joint CoR. Consistency of instantaneous joint CoRs determined in the same rotation angle range was improved by 31.7% to 51.0% in the proposed method. The present study focused on distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints of the index finger of a participant. Joints of the whole hands of more participants will be studied for further generalization of the findings.

Download Full-text

The Effects of Visual Discriminability and Rotation Angle on 30-Month-Olds’ Search Performance in Spatial Rotation Tasks

Frontiers in Psychology ◽

10.3389/fpsyg.2016.01648 ◽

2016 ◽

Vol 7 ◽

Author(s):

Mirjam Ebersbach ◽

Christian Nawroth

Keyword(s):

Rotation Angle ◽

Search Performance ◽

Spatial Rotation

Download Full-text

A Novel Method of Parameter Estimation in Wideband Bistatic MIMO Radar System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.5038 ◽

2014 ◽

Vol 556-562 ◽

pp. 5038-5041

Author(s):

Li Li

Keyword(s):

Rotation Angle ◽

Mimo Radar ◽

Radar System ◽

Music Algorithm ◽

Signal Model ◽

Bistatic Mimo Radar ◽

Optimal Rotation ◽

Novel Method ◽

Esprit Algorithm ◽

Optimal Rotation Angle

This paper proposes a new wideband signal model and a novel method in wideband bistatic MIMO radar system. Firstly, a new signal array model is proposed. Secondly, Doppler stretch and time delay are jointly estimated by searching the optimal rotation angle to meet concentrated-energy of the fractional correlation function. Furthermore, two algorithms are presented for the estimation of DODs and DOAs, including based on MUSIC algorithm and ESPRIT algorithm. Simulation results are presented to verity the effectiveness of the proposed method.

Download Full-text

A Measurement Method for Ball Joint Spatial Rotation Angle

Sensors and Materials ◽

10.18494/sam.2015.1126 ◽

2015 ◽

pp. 1

Keyword(s):

Measurement Method ◽

Rotation Angle ◽

Ball Joint ◽

Spatial Rotation

Download Full-text

Velocity Calibration of Doppler Current Profiler Transducers

Journal of Marine Science and Engineering ◽

10.3390/jmse8110847 ◽

2020 ◽

Vol 8 (11) ◽

pp. 847

Author(s):

Marc Le Menn ◽

Steffen Morvan

Keyword(s):

Water Mass ◽

Measurement Range ◽

Variable Frequency ◽

Oceanic Circulation ◽

Velocity Measurements ◽

Current Profiler ◽

Novel Method ◽

Velocity Calibration ◽

Tilt Sensors ◽

Electronic Compass

Doppler current profilers are used in oceanography to measure oceanic circulation but also in hydrology to calculate the flow of rivers. They allow the retrieval of water mass profiles in terms of velocity and direction. Direction is obtained via an electronic compass and tilt sensors, while velocity is obtained by measuring Doppler pulse shifts back-scattered by particles located in water cells allocated along the instrument’s measurement range. Current meters are usually tested in towing basins or hydrodynamic channels, but these facilities present limits in terms of the measurement range, particles concentration and time costs. This paper presents a novel method developed to test the trueness of these velocity measurements in the laboratory, along with the uncertainty of this test and the results obtained with current meters and stand-alone profilers. The method is based on the measurement of the frequency of pulses emitted by each transducer of the instrument independently, and on the simulation of received echoes by a variable frequency sinusoidal signal.

Download Full-text

Structure and migration of planar defects in crystals observed in atomic scale

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100108568 ◽

1978 ◽

Vol 36 (1) ◽

pp. 284-285 ◽

Cited By ~ 1

Author(s):

H. Hashimoto ◽

Y. Sugimoto ◽

Y. Takai ◽

H. Endoh

Keyword(s):

Electron Microscope ◽

Rotation Angle ◽

Crystal Surface ◽

Electron Gun ◽

Atomic Scale ◽

Present Observation ◽

Twist Boundary ◽

Optical Magnification ◽

Zinc Crystal ◽

And Migration

As was demonstrated by the present authors that atomic structure of simple crystal can be photographed by the conventional 100 kV electron microscope adjusted at “aberration free focus (AFF)” condition. In order to operate the microscope at AFF condition effectively, highly stabilized electron beams with small energy spread and small beam divergence are necessary. In the present observation, a 120 kV electron microscope with LaB6 electron gun was used. The most of the images were taken with the direct electron optical magnification of 1.3 million times and then magnified photographically.1. Twist boundary of ZnSFig. 1 is the image of wurtzite single crystal with twist boundary grown on the surface of zinc crystal by the reaction of sulphur vapour of 1540 Torr at 500°C. Crystal surface is parallel to (00.1) plane and electron beam is incident along the axis normal to the crystal surface. In the twist boundary there is a dislocation net work between two perfect crystals with a certain rotation angle.

Download Full-text

The removal and morphology of intact biofilms from implanted venous access devices

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100141470 ◽

1995 ◽

Vol 53 ◽

pp. 1020-1021

Author(s):

M.A. Gregory ◽

G.P. Hadley

Keyword(s):

Patient Selection ◽

Surgical Oncology ◽

Venous Access ◽

Common Procedure ◽

Indwelling Catheters ◽

Careful Patient ◽

Novel Method ◽

The Subject ◽

Vascular Catheters ◽

Venous Access Devices

The insertion of implanted venous access systems for children undergoing prolonged courses of chemotherapy has become a common procedure in pediatric surgical oncology. While not permanently implanted, the devices are expected to remain functional until cure of the primary disease is assured. Despite careful patient selection and standardised insertion and access techniques, some devices fail. The most commonly encountered problems are colonisation of the device with bacteria and catheter occlusion. Both of these difficulties relate to the development of a biofilm within the port and catheter. The morphology and evolution of biofilms in indwelling vascular catheters is the subject of ongoing investigation. To date, however, such investigations have been confined to the examination of fragments of biofilm scraped or sonicated from sections of catheter. This report describes a novel method for the extraction of intact biofilms from indwelling catheters.15 children with Wilm’s tumour and who had received venous implants were studied. Catheters were removed because of infection (n=6) or electively at the end of chemotherapy.

Download Full-text