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The traditional transformer respirator lacks the detection means, cannot realize the long-distance monitoring, and must carry on the regular inspection through the running staff to determine its state. This paper introduces a method of automatic detection of transformer respirator based on image processing with the aid of the intelligent inspection robot on-site shooting, returning the transformer...
Robot-assisted minimally invasive surgery becomes more and more popular, but the lack of force sensing for surgical robots restricts the development of this technology. The traditional way to obtain tool-tissue interaction force is to integrate sensors at the end of surgical instruments, which is not well adopted in practical due to high-cost and sterilization problems. It is necessary to explore...
Surgery robot for pedicle screw placement is explored based on parallel manipulator. To improve the accuracy of parallel manipulator, a practical calibration algorithm is mainly discussed. At the beginning, a novel measurement scheme for calibration is proposed. In order to construct the error model, the propagation of error is analyzed and the procedures for constructing error model are particularly...
In this paper, coupled field analysis methods in finite element analysis software are investigated. 3D mechanical modeling software Solidworks 2011 and general finite element analysis software ANSYS Workbench 14.0 are used in combination, and two sets of sequential coupling simulation schemes containing thermal-vibration sequential coupling analysis and vibration-thermal sequential coupling analysis...
The rapid development of the Internet of Things (IoT) has brought great changes for non-contact and non-destructive sensing and diagnosis. For every inanimate object can tell us something by the sound it makes, acoustic sensor demonstrates great advantages comparing to conventional electronic and mechanic sensors in such cases: overcoming environmental obstacles, mapping to existing use cases of detecting...
Sensors are pervasively deployed on mobile devices with the development of Internet of Things technology. Value-added services are innovated and developed by analyzing data streams from massive number of mobile sensors in online mode. Due to dynamic working condition of mobile sensors and the high data rate, back end analytic services confront incoming streams with large rate fluctuation and out-of-order...
Constellation of regional BDS has been completed with five Geostationary Earth Orbit (GEO) satellites, five Inclined Geosynchronous Satellite Orbit (IGSO) satellites and four Medium Earth Orbit (MEO) satellites, which can provide positioning, navigation, timing, short-message communication and other services for regional users. China's BDS continues to develop a global system in near future. In order...
A 3–7GHz 4-element digital modulated polar phased-array transmitter (TX) in 40nm CMOS with 0.35° phase resolution and 38.2% peak system efficiency is presented in this paper. Phase-shifting in phase modulation path is utilized in each element to improve amplitude error. The RMS phase error of 0.3° is achieved with current-DAC based 10-bit phase shifter after digital pre-distortion. Efficiency for...
Multi grid-connected inverters islanding detection methods include two categories: passive islanding detection and active islanding detection. Firstly, an active islanding detection method based on negative sequence current disturbance is analyzed. Aiming at the shortcomings of this method, a novel passive islanding detection method is proposed in this paper. The proposed islanding detection method...
The Ray-Casting algorithm is an important method for fast real-time surface display from 3D medical images. Based on Ray-Casting algorithm, a novel parallel Ray-Casting algorithm is proposed in this paper. A novel operation is introduced and defined as a star operation, and star operations can be computed in parallel in the proposed algorithm compared with the serial chain of star operations in the...
Nowadays, more than 5,000 rod pumping wells are running in the Huabei Oilfield and take a great account of the production wells. To increase the management efficiency of these stripper wells as well as lowering the management's cost, we have installed the wisdom-oilfield components that uses innovative technologies such as wireless networks, well sensors to collect and send the operating data to the...
In order to combine the advantages of both wheeled robot and legged robot, a multi-motion mode wheel-legged hexapod robot is designed. The robot can change motion mode to stable walking or fast skating. The design principle of the wheel-legged hexapod robot is introduced. The kinematics of swinging legs and supporting legs are analyzed independently. The tripod gait of the robot for walking is planned...
In time difference of arrival (TDOA) location system, the cooperative localization algorithm based on Particle swarm optimization (PSO) and Taylor series not only solves the problem that particle swarm is easy to fall into local optimum, but also avoids the inappropriate initial value which leads to non convergence of Newton iterative algorithm. In practical applications, the coordinate information...
Transportation modes identification is an important transportation research problem with wide applications. Traditional methods are mainly done based on GPS, WiFi and some other electronic devices, which are actually not in adequately widespread use. The popularity of mobile phones makes the work of identification by mobile phone data valuable. In this paper, based on mobile phone data without other...
A 3.1–7 GHz fully integrated polar transmitter (TX) in 40-nm CMOS process with high data-rate and reconfigurable feed-forward operation is proposed. The real-time feed-forward operation is utilized to improve the power efficiency at back-off and saturated power levels in a wideband. With the wideband Marchand balun based open-loop digital phase modulator, the wide modulation-bandwidth and high data-rate...
Endoscopic nasal surgery is with minimal invasiveness for the surgical treatment of chronic sinusitis or other nasal diseases. During the endoscopic surgery, the surgeon uses one hand to hold the endoscope and the other hand to hold the surgical instruments within the nasal cavity. In some cases, the endoscope has to be held by the assistant when the surgeon needs to use both hands to manipulate the...
The accuracy of registration is one of the key issues in surgical navigation, which directly affects the result of operation. In this paper, we proposed a new registration algorithm, Tetrahedral Framework (TF), to improve precision and computing speed and conducted a calibration experiment by using the wax model with markers. The image data are obtained by Micro-CT scanning and loaded in VTK to gain...
Moving objects, for example vehicles, vessels, people, are being instrumented with Internet of Things devices such as GPS, environmental sensors, mobile cameras that produce big streaming data with spatial-temporal features enabling application innovations in many industries for autonomous driving, usage based insurance, fleet management, etc. We introduce an analytics framework to streamline the...
Aiming at the impulse of the DC bus voltage of the switched reluctance motor under high speed condition, as well as the problem of insufficient power shortage in the medium and low speed state, the regenerative braking process of the switched reluctance motor is analyzed. In low-speed state, the position angle combined with full voltage shut down method, in high-speed state, the angular position with...
GPS map matching is the process to align observed GPS positions with road networks of a digital map. One of the key technique in a state-of-art GPS map matching algorithm is to select candidates for each observed GPS point. Traditional candidate selection algorithms focus on spatial proximity, which is not sufficient in real cases. This paper proposes a novel candidate selection algorithm for GPS...
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