The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A novel approach based on graph matching for myocardial motion estimation using cine MRI is presented in this paper. The dissimilarity measure between nodes and that between edges are defined to construct a cost function to measure the dissimilarity between two graphs. The sparsity constraint and affine constraint are introduced into the cost function. The alternating direction method of multipliers...
We demonstrate single transverse-mode operation of InAs quantum dot (QD) broad-area coupled waveguide lasers enabled by parity-time symmetry breaking. By tuning the loss, suppression and revival of higher order modes from fundamental mode is obtained.
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
This paper briefly introduces the charging and discharging characteristics of electric vehicles, and calculates the charging and discharging load of electric vehicles by Monte Carlo simulation method. A dynamic scene analysis method is used to deal with the stochastic uncertainty of electric vehicles charging and discharging, and the dynamic neural network is used to predict the load. The paper uses...
In view of the development of the computer network and the vehicle networking technology in the field of transportation, the traffic data which need to be processed in the practical application is explosive. ARM-Linux was proposed based on cloud computing hadoop platform real-time monitoring remote terminal in the big scheme of data analysis and calculation, Hadoop is facing big data computing, open...
Road transportation is one of the main source of carbon dioxide emissions, and it is imperative to estimate the carbon dioxide contribution of road transportation precisely, so that carbon dioxide emission-reduction measures can be designed and implemented appropriately. Microscopic emission models and GPS trajectories are widely used in estimating carbon dioxide emissions. Microscopic emission models...
Human motion detection based on CSI (Channel State Information) is a hot research topic. Many researchers started to focus on it. By extracting amplitude and phase of CSI, it can be applied to detect human motions. In this paper, we employ the phase to detect intrusion. Firstly, we use a liner transformation to eliminate the shift of phases of different subcarriers. Subsequently, we defined two reference...
The Knox test is a common method to analyze the spatio-temporal interaction patterns of events. It has been used in many fields such as criminology, medical and public health, epidemiology, etc. However, this method has been criticized for arbitrary selection of critical distances. The same set of events may manifest different spatio-temporal interaction patterns under different critical distances,...
Ultrasonic sparse array can increase the resolution by enlarging the aperture without adding system complexity, and it has characteristics of large scanning range and high detection accuracy, which is one of the most promising applications of ultrasonic nondestructive testing technology. The application of reciprocity theory to scattering of guided waves by flaws was studied. A finite element model...
A planetary gearbox (PG) has many advantages and thus it is widely used in industry. It is reported that poor operating conditions and complex loading can lead to the impact on the PG, even the failure of the whole transmission system. Therefore, the dynamics and vibration characteristics of the PG has increasingly attracted attentions for the aim of designing a highly reliable and low-vibration planetary...
The problem of local and weak defect detection in rotating machinery has been widely studied in many literatures. Its vibration signal is not easy to be recognized in the raw signal owing to its low energy level at the early stage of the fault and strong background noise. An early developed and still widely used technique for such a signal detection is envelope analysis. Despite the fruitful modifications...
Ultrasonic guided waves were widely used in aeronautics, pipeline, vessels and so on because of its long distance propagation and large range detection property. Due to the long distance propagation along waveguides, the guided waves were not only possessing the feature of ultrasonic bulk waves, but also dispersion and multi-mode characters, which limited detection effect of guided waves and increased...
Foot placement plays an important role in human stable walking. Utilizing the linear inverted pendulum model and the capture point theory, the laws of foot placement and two stable walking conditions are derived in this paper. These stable walking conditions are demonstrated by the optical motion capture experiment. The experiment not only shows that the foot placement during walking is within a capture...
In the electromagnetic coupling system, the sinusoidal coupling signal extraction is crucial. It will be difficult to extract the signal parameters because of the possibility of signal frequency offset and saturation. Hence, this paper proposes an algorithm combined Artificial Bee Colony algorithm (ABC) and the Levenberg-Marquardt(LM) algorithm to extract sinusoidal parameters from saturation sinusoidal...
The vertical electron density distribution can have a significant impact on ionospheric measurements of Total Electron Content (TEC) derived from estimates of Faraday rotation (FR) with spaceborne low-frequency SAR data. Using vertical electron density data and the IGRF-12 magnetic field model, simulations of FR under different vertical electron density distributions for an L-band SAR have been performed...
SAR image segmentation is the pre-process for SAR image application. This paper presents a new SAR image segmentation algorithm combining both the the bias field and Markov random field(MRF) characteristic with fuzzy clustering model(FCM) called BMFCM. The MRF characteristic of an image includes the spatial information of the image and the bias filed estimation is introduced to deal with the grey...
The passive microwave observations from geostationary earth orbit (GEO) are able to enhance the short-time forecasting of tropical cyclones (TCs) due to its ability to track and detect the internal structure of TCs. To assess the operational capabilities of the candidate GEO microwave instruments, the numerical simulations of GEO microwave observation for the three TC cases were carried out. This...
This paper proposes a novel encryption scheme for digital image during transmission, in both frequency and spatial-domain using hyper digital chaos. In frequency-domain, both of the magnitude and phase spectra of the image are encrypted, in which a huge key space is created due to hyper digital chaos. After that, additional spatial-domain encryption is implemented for security enhancement. It is proved...
In the IEEE 100G-EPON, channel bonding enables ONUs to work on multiple wavelengths simultaneously to achieve higher peak rates. Three types of ONUs (25G, 50G and100G ONUs) share all the 100G bandwidth and each type of ONUs have a total capacity constraint. In this paper, a fair and flexible dynamic wavelength and bandwidth allocation algorithm is proposed for 100G-EPON. Proposed algorithm considers...
Infrared and visible image fusion is an active area in digital image processing. Many methods in spatial or transform domains have been proposed, but there are still several complex challenges. In this paper, we introduce a three-scale image transformation, which possesses multi-scale, translation-invariance and spatial-localization characteristics that are very important for image fusion. The decomposition...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.