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.
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
In this paper, an accurate method for determining all the modes in a layered medium background truncated at top by a perfectly matched layer (PML) backed with a perfectly electric conductor (PEC) is proposed. Adding a PML backed with a PEC makes the Green's functions for a layered medium background can be expanded with the discrete set of the eigenmodes, avoiding numerically calculating the Sommerfeld...
The multilevel fast multipole algorithm (MLFMA) has been used in calculating electromagnetic scatterings from electrically large objects. The octree structure plays an important role in the MLFMA. However, in the multi-resolution case, a single octree structure may produce a larger near-field matrix. In this paper, in order to overcome this shortcoming to a certain extent, a hybrid tree structure...
A vector signal can be sparsely represented by a linear combination of small number of atoms in a dictionary. Many works focused on finding this dictionary by adopting a learning point-of-view. We present a new dictionary learning method with Weighted Stochastic Gradient Descent (WSGD). We construct a novel cost function by introducing a weighting matrix and solve this problem by stochastic gradient...
As the electromagnetic measurement while drilling (EMMWD) becomes a popular researching subject, the numerical solution to wire antenna in inhomogeneous media has been the key of the numerical analysis for this technology. In this article, the NMM method is combined with the wire antenna theory for the first time, which is used to solve the Green's function in layered media. With the advantage of...
This paper introduced a improved gabor function based on fingerprint image enhanced algorithm in wavelet domain. The algorithm optimized standard deviation and filter window size, and changed the fixed size and fixed standard deviation of Gabor filter into a function of the fingerprint ridge frequency F (i, j). As the result, the designed filters can make full use of the data of image itself to enhancement...
In this paper, a meshless quasi-interpolation method based on a special radial basis function (RBFs), i.e. Multi-Quadrics (MQ) is presented for the numerical solution of 1-dimensional Maxwell's equations. RBFs have attractive properties such as theoretical exponential convergence for increasingly dense distinct node distributions. The time derivatives are still tackled with the customary explicit...
An ultra wideband phased array antenna element in the frequency range of 5∶1 and with the scan angle from −60° to 60° is designed in this paper. The Wide Angel Impedance Matching (WAIM) layer has a low profile as compared to the WAIM Layer presented in Finite Antenna Arrays and FSS. A hyperbolic balun is adopted to connect the printed planar dipole to the SMA connector, which is placed on the back...
In recent years, Dynamic spectrum leasing (DSL) strategies are studied as a new paradigm for dynamic spectrum sharing (DSS) in cognitive radio networks (CRN's). In traditional spectrum leasing model, the cooperative Secondary Users (SUs) use higher power to transmit their own packets but a lower power to relay the packets of primary user. On the other hand, many existing research work can be characterized...
In this paper, we propose a color table based distributed collision avoidance algorithm to resolve the reader collision problem (RCP) of radio frequency identification (RFID) reader network. The proposed algorithm is developed to overcome the drawbacks of distributed color selection (DCS) and Colorwave algorithms. Firstly, we use a systematic method to help reader select a new color when collision...
Supporting effective and efficient data delivery in delay tolerant networks (DTNs) is a challenging problem due to the nature of the network. In this paper, we propose to use network coding technique based on Growth Code to improve the performance of data delivery in DTNs. We incorporate Growth Codes into Epidemic Routing and First Contact routing in DTNs to provide two network coding based routing...
With the explosive growth of wireless data traffic, the energy-efficient design in wireless networks is becoming an inevitable trend. In this paper, we study the low-complexity design issue of energy-efficient radio resource allocation in downlink OFDMA networks. Distinguished from the existing works, we focus on the tradeoff between the energy efficiency and the total transmit power. The closed-form...
A new coaxial-to-stripline transition based on low temperature co-fired ceramic (LTCC) is proposed and experimentally verified. An additional multilayer dielectric cavity is embedded in the LTCC substrate to improve the impedance and field matching and therefore achieve a wide bandwidth. The measurement results for a back-to-back structure show an a return loss better than 10 dB up to 67GHz.
As there is a restriction in coding length selection when using the original phase-encoded and frequency-hopped signals to compose a single-cycle FSK/PSK signal, a new method for generation of a multi-cycle FSK/PSK signal is proposed which allowed selecting the coding sequences of all length. The ambiguity function expression of this type of signal is derived. The distance and speed resolution has...
In this paper, we propose an effective approach towards color image segmentation for micro-vessel detection in the virtual slide of double stained liver tissue. The contribution of the proposed method lies in three aspects. First, the dominant colors of white/gray, blue, red and brown are modeled in the RGB color space. Second, the CART (classification and regress tree) method is implemented to segment...
Nowadays, computers and networks have become the infrastructure of people's daily lives. As the Internet becomes more open to public, most people and organizations prefer to use online services. At the same time, the Internet security problem is becoming more severe. An effective and feasible protection measure for network security is necessary. Intrusion detection system (IDS) is a typical measure...
The average travel speed and waiting time of cars are factors which determine the time taken to get to a destination. These factors are influenced by the traffic situation at various sections of the road. In this paper a novel Distributed Intelligent Traffic System (DITS) which is based on Ant Colony Optimization has been proposed. In the proposed model the average speed of cars at various sections...
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.