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A signal quality assessment method for mobile ECG based on fuzzy support vector machines (FSVM) and multi-feature was proposed to help users to determine whether the ECG recordings collected using mobile phone are acceptable or not. The proposed method mainly included two modules: feature extraction and an intelligent classification approach, i.e. a FSVM classifier. First, 27 features derived from...
This research proposes an object recognition system using image processing and neural network based classification. The system is capable of recognizing 7 objects from an uncluttered background by extracting color, texture and shape features. The proposed system consists of image segmentation, feature extraction and classification. Diverse neural network topology settings have been employed for evaluation...
In recent years, elderly people are suffering an increasingly severe problem in their home due to the falls. Falling down is the most common cause of death among the elderly. This paper proposed a falling detection algorithm based on a humanoid robot to monitor and detect the motion of the elderly who live alone. A stream of the videos obtained from the robot cameras are transmitted to the personal...
Magnetic surface polariton (MSP) is a surface electromagnetic mode which is the dual of surface plasmon polaritons and has some peculiar properties. In the present paper, based on this surface mode, we design a 2D Luneburg lens for the manipulation of magnetic surface polariton. MSP-based devices may be realized using magnetic metamaterials or composite magnetic materials.
To assimilate satellite-based passive microwave observation over heavy clouds and precipitation into numerical weather prediction (NWP) systems and thus to improve the performance of it has become an intensely studied topic. These attempts rely on the development of a radiative transfer (RT) model that accounts for particle scattering and accurately simulates the observation process at an acceptable...
In order to realize the synchronous operation of the stage elevators, a multi-motor synchronous control scheme based on the combination of non-smooth control and state observer is proposed. For the difference among the parameters of the motor systems, and the other factors such as parameters' perturbation and outside interference, the stage elevators may not synchronize. Therefore, in order to solve...
In this paper, a new approach developed to retrieve temporally-differenced maps of the spatial distribution of water vapor from interferometric synthetic aperture radar (InSAR) data with a horizontal resolution as fine as 20 m is described. To get a more accurate map of wet delay, we used the ERA-Interim to predict the dry delay component in the total atmospheric delay from InSAR. In addition, the...
Synthetic Aperture Radar (SAR) imaging can suffer distortion in the presence of phase errors in the acquired signal data caused by the non-ideal platform motion trajectory. Autofocus algorithms are used to remove the undesired phase error through signal processing techniques. Multi-channel convolution model of the SAR autofocus problem is established on the condition that phase error is range-independent...
Utilizing MOD13Q1-NDVI data from 2000 to 2014, vegetation change in a 50 km buffer area around the Huitengliang wind farm, Inner Mongolia, was analyzed. Combining meteorological data in this analysis, the impact of wind direction on vegetation growth was discussed. Compared with the construction phase (2000–2008), the operation phase (2008–2014) has a more obvious impact on the growth of vegetation...
The paper has studied the problem of H∞ filtering for Markovian jump stochastic systems with uncertain transition probabilities. The systems under consideration not only involve uncertainties both in the system matrices and in the mode transition rate matrix, but also contain time-varying delays. By free-weighting matrix technique, a sufficient condition for the existence of an H∞ filter is developed...
The grid security has become a popular topic in both academia and industry. The efficient monitoring of overhead transmission line is particularly important. This paper focuses on monitoring network design for overhead transmission line in smart grid by using wireless sensor network (WSN). For this purpose, a large number of nodes are deployed along the overhead transmission line, which collect and...
Most existing person re-identification (re-id) methods focus on learning the optimal distance metrics across camera views. Typically a person's appearance is represented using features of thousands of dimensions, whilst only hundreds of training samples are available due to the difficulties in collecting matched training images. With the number of training samples much smaller than the feature dimension,...
Morphological changes of retinal vessels such as arteriovenous (AV) nicking are signs of many systemic diseases. In this paper, an automatic method for AV-nicking detection is proposed. The proposed method includes crossover point detection and AV-nicking identification. Vessel segmentation, vessel thinning, and feature point recognition are performed to detect crossover point. A method of vessel...
Commutation failure is a common and highlighting fault in HVDC transmission system. According to the physical mechanism of thyristor turn-off process and carrier motion process, topology optimization method of HVDC converter valve is proposed for reducing the occurrence rate of commutation failure. The thyristors turn-off process is also simulated by Matlab/Simulink software. Simulation results verified...
A set of measurement system for the testing of transmission lines, composing of wireless center station, wireless current acquisition and transmission nodes, wireless voltage acquisition and transmission node, was designed, which was based on wireless communication. The high speed wireless bridge working at 2.4GHz together with the clock synchronization module based on the IEEE1588 communicating protocol...
In order to judge commutation failure faster and more accurately, a new prognosis method was proposed. The physical mechanism of a three-phase full wave rectifier circuit was analyzed, and an arc angle formula based on impedance parameters was proposed to judge commutation failure. It's easy to get the information of impedance parameters, thus this prognosis method based on impedance parameters is...
As a new way of power transmission, wireless power transmission (WPT) technology has an influence on the sides of lives, medical treatment, etc. In this paper, we did model analysis and simulation using its equivalent circuit model, which is on the basis of existed WPT technology. According to the most widely used MCR-WPT technology, we have built two-coil model and done simulation analysis so as...
High quality germanium (Ge), III–V (GaAs, GaN) on insulator substrates (“X”-OI, X = Ge, GaAs or GaN) are demonstrated on 200 mm Si wafer. The Ge or III–V epitaxial films are grown directly on the Si donor wafers using a metal-organic chemical vapour deposition (MOCVD). The epilayers are then bonded and transferred to another Si (001) handle wafers to form various “X”-OI substrates. The quality of...
This study proposes a new car-following (CF) model considering the effect of visual angle under the non-lane-discipline environment. In particular, the visual angle of the driver between the following vehicle and the preceding vehicle as well as its change rate is considered on a road without lane discipline. Stability analysis of the proposed CF model is performed using the perturbation method to...
Spark has grown both in popularity and complexity in recent years. In order to use available resources in an efficient way, users need to understand how the behavior of their applications is affected by the size of the datasets and various configuration settings. Indeed, Spark allows users to specify many configuration parameters and understanding the impact of these choices with respect to the application...
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