We exploit the embedding ability of a de-noising autoencoder for an implicit 3D rotation representation learning at the category level. Contrast to the exact 3D reconstruction model of each instance-level physical obj...
详细信息
The fault recording monitoring system is a kind of automatic information recording equipment for distribution network that is put into operation all the year round. It is used to monitor the operation status of the po...
详细信息
The fault recording monitoring system is a kind of automatic information recording equipment for distribution network that is put into operation all the year round. It is used to monitor the operation status of the power system to analyze the cause of the fault, quickly and accurately locate the fault occurrence point, monitor and verify the action characteristics of the relay protection automatic device, etc. Different from the centralized fixed structure of the traditional microcomputer-based fault recorder, we designed a modular distributed grid fault recording system with ultra-low-power characteristic. According to the precision complementary characteristics of the global positioning system(GPS) and the crystal clock signal, the GPS clock is used to calibrate the system clock to realize the microsecond high-precision clock, which meets the high requirements of synchronization acquisition of the three-phase current. The effectiveness of the proposed synchronization algorithm is validated by experiments on actual system.
Recently, many researchers multiplex binary infrared sensors in object tracking, habitat monitoring, and atypical behavior detection. Due to the binary digit output of binary sensors, multiplex binary sensors may lead...
详细信息
ISBN:
(数字)9781728152127
ISBN:
(纸本)9781728152134
Recently, many researchers multiplex binary infrared sensors in object tracking, habitat monitoring, and atypical behavior detection. Due to the binary digit output of binary sensors, multiplex binary sensors may lead to count the wrong number of targets when three or more targets present in the field of interest (FOI). We call this as the invisible targets' problem. To enhance the sensing results of sensors, a reference structure tomography technique is used to segment and code the FOI by modulating the sensing view of sensors. In this paper, we propose a subregion coding method to count targets moving in the FOI. Hexagon modulators are designed to make their projections segment the FOI into hexagon cells. We also propose a signature construct scheme to code cells and a encoder to count the number of targets in the FOI. Experiment results show that the accuracy to correctly count targets of our method is around 90% which is much better than 45% of a conventional method.
In ball games, the arm movements are diverse and complex. The accurate recognition of the arm movements is of great significance to the quality of training and sports guidance. Wrist sensor is one of the important mea...
详细信息
ISBN:
(数字)9781728107707
ISBN:
(纸本)9781728107714
In ball games, the arm movements are diverse and complex. The accurate recognition of the arm movements is of great significance to the quality of training and sports guidance. Wrist sensor is one of the important means. Traditional wrist sensors recognize batting action by measuring the acceleration and angular velocity of the arm and have a good performance. But they measure few features, and it has a slightly larger size that has some effect on player performance. In this paper, we develop a motion recognition platform for Basketball, Ping-Pong, and badminton. It is accurate enough for recognizing these motions whether hits or miss the Ping-Pong ball. The system integrates a low-power nine-axis inertial sensor and a low-power environment sensor that can output eleven different characteristics such as triaxial acceleration, triaxial angular velocity, triaxial magnetic field strength, air pressure, and temperature. This system includes the power management part, attitude detection part, Bluetooth wireless communication part and mobile terminal monitoring part. The inertial sensor can identify the arm action, and then transmits posture data to the Microcontroller Unit (MCU) for analysis and processing. Bluetooth 5.0 is used between the MCU and the mobile monitor for information exchange, which makes data transmission faster and more stable. Experiments of the 3 athletes have demonstrated that the movements can be accurately identified. And the entire system has very low power consumption and very small size (23.05mm*9.25mm*5.5mm). It provides a multi-feature measurement platform for body movement posture research and can recognize a variety of ball games movement, which is of great significance for intelligent sports training and research.
With the increasing scale of the power grid, real-time monitoring requirements for on-site data of power systems in various countries around the world are getting higher and higher. The high-voltage distribution netwo...
详细信息
With the increasing scale of the power grid, real-time monitoring requirements for on-site data of power systems in various countries around the world are getting higher and higher. The high-voltage distribution network is widely distributed,spanning rivers, rivers, mountains, deep valleys, jungles, and other complex and variable environments so that it is susceptible to short-circuit faults caused by various natural disasters and other environmental factors. Single-phase ground faults are also common in the grid, and working information and necessary alarm indications during network operation are also *** real-time monitor of the line current is indispensable for short-circuiting faults, while ground faults need to monitor the zero-sequence voltage in the substation and call the original sampled data for analysis. When there is a transient short-circuit fault in the distribution network, the transmission line resumes operation after reclosing, but the hidden danger still exists. In the fault recording system, the data can be analyzed in time to avoid the fault happening again. For the permanent short-circuit fault, the fault still exists after the gate reclosing. The analyze of recorded data can avoid strong power transmission measures of the system which can reduce the secondary impact and minimize the loss caused by the fault. In response to these functional requirements, this paper designs a new fault recording system and introduces its hardware structure and function implementation.
The dynamic monitoring of vivo blood glucose acts an important role for diabetic patients to ensure timely healthcare and help to prevent from multiple complications caused by diabetes. This report describes a new non...
详细信息
This paper is concerned with the tracking control for robotic manipulators with switching loads and parameter uncertainties. More precisely, the neural network approximation method is adopted with adaptive control to ...
详细信息
ISBN:
(数字)9781728172934
ISBN:
(纸本)9781728172941
This paper is concerned with the tracking control for robotic manipulators with switching loads and parameter uncertainties. More precisely, the neural network approximation method is adopted with adaptive control to deal with the unmodeled dynamics. Multiple Lyapunov function method is used based on mode-dependent average dwell time, such that the tracking error can converge with desired region. A numerical example is finally provided for illustrating our proposed tracking strategy.
In this paper, the inverse kinematical analysis problem is investigated for a class of bio-inspired cable-driven robotic manipulator. Moreover, the modeling of the redundant cable-driven robotic manipulator is perform...
详细信息
ISBN:
(数字)9781728172934
ISBN:
(纸本)9781728172941
In this paper, the inverse kinematical analysis problem is investigated for a class of bio-inspired cable-driven robotic manipulator. Moreover, the modeling of the redundant cable-driven robotic manipulator is performed. In particular, the RBF neural network is adopted to deal with the unmodeled parameters uncertainties such that the inverse kinematic analysis precision can be improved. In the end, an illustrative example is presented for showing the usefulness of the developed analysis approach.
Mechanisms with flexible orientation capability and compact structure have great application prospects in manufacturing equipment, flight simulator, airborne radar, and similar fields. In this paper, a two-degree-of-f...
详细信息
ISBN:
(数字)9781728107707
ISBN:
(纸本)9781728107714
Mechanisms with flexible orientation capability and compact structure have great application prospects in manufacturing equipment, flight simulator, airborne radar, and similar fields. In this paper, a two-degree-of-freedom (2-DoF) spatial parallel kinematic mechanism with three identical kinematic chains is presented. Due to the strong coupling property, its kinematic mechanism issues in terms of forward and inverse kinematics are fundamental to its practical application and thus have been investigated. Based on the kinematic analysis results, the orientation capability of the presented mechanism can reach 40° for an arbitrary azimuth angle. Benefitting from the parallel kinematic structure and coupling kinematics, the presented mechanism also has potential advantages of high stiffness and quick response.
In this paper, by using the combination of Leap Motion and Myo armband, two methods for hand tracking and online hand gesture identification are proposed. With the proposed methods, We have improved the measurement ac...
详细信息
ISBN:
(数字)9781728158594
ISBN:
(纸本)9781728158600
In this paper, by using the combination of Leap Motion and Myo armband, two methods for hand tracking and online hand gesture identification are proposed. With the proposed methods, We have improved the measurement accuracy of the palm direction and solved the problem of insufficient accuracy when the palm is at the limit of the measurement range. We use the Kalman filter algorithm and the neural network classification method to process the data measured by Leap Motion and Myo, so that the tracking of the operator's hand gesture is more accurate and robust even when the hand is at positions close to the measurement limit of one single sensor. The methods, which improve the hand tracking accuracy, can be used for robotic control, demonstration or teleoperation. The effectiveness of the proposed methods has been demonstrated through comparative experiments.
暂无评论