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.
The design method of the spectral beam filter, which is employed in the solar concentrating system to improve solar energy utilization and electronic conversion efficiency, is presented. The layer stack is designed by using the needle optimization technique to match the spectrum range of silicon photovoltaic (PV) solar cells, and the reflection film materials are Nb2O5 and SiO2. The coating is performed...
Particle swarm optimization (PSO) is simple and efficient, but there is serious premature convergence for solving constrained optimization problem. In order to control premature convergence, this paper proposed dynamic neighborhood hybrid particle swarm optimization (DNH_PSO), which firstly uses the dynamic neighborhood strategy that based on the random topology and the von Neumann topology to improve...
The relationship of reciprocity between travel demand and land use is an eternal focus for the development of a city. The Spatial-temporal feature of urban system decides the multidimensional feature of the reciprocity between these two issues. Exploring multidimensional-coupling relationship between travel demand and land use has of importance meaning to understanding and handling the trend and rule...
Spatial interpolation of scalar data is widely used in some fields such as partition of biological type distribution and land-use planning. Usually, this kind of spatial interpolation is based on the nearest neighborhood interpolation. In this paper, some shortages of traditional spatial interpolation method based on amalgamation of voronoi polygons, such as non intelligence, large consumption computation,...
Kernel Entropy Component Analysis (KECA) is a new spectral method which has been proposed recently. Via a kernel-based Renyi entropy estimator which is expressed in terms of projections onto kernel feature space principal axes, it directly related to the Renyi entropy of the input space data set. In the KECA, choice of kernel functions must be obey Mercer's condition. Means the kernel function used...
In digital environment, the size and shape of point-shaped geographic information generally is not of practical meaning. Scholars' interests are more focused on the spatial structure information that implied in the layout of spatial point clusters rather than the size and shape of a single unit. In order to describe the spatial structure information that implied in targeted point clusters, defining...
In order to analyze the influence of embankment on wind velocity field and vehicle dynamic responses under the influence of sudden cross-wind, Finite element models of different height embankments are built to analyze wind velocity field, and wind velocity on different height of left travel lane is computed. Then two degree of freedom vehicle model is established to analyze vehicle dynamic responses...
The management of moving objects is an intensive study area in recent years. Currently many researches focus on objects freely moving on 2-dimensional space, and a lot of index strategies have been proposed, while they are not applicable for objects moving on fixed networks. As objects moving on fixed networks are pervasive in real application, its study is of great practical significance. As changing...
Network coding (NC) can improve the network performance, facilitate algorithm/protocol design, and deal with application-specific problems in wireless networks. Recently, inspired by the traditional network-layer NC, physical-layer network coding (PLNC) has been proposed to further improve the performance achieved by traditional NC schemes. PLNC has been proven to outperform traditional NC, be able...
Non-diffraction waves have great importance in medical imaging, especially the Bessel beams. In order to obtain a spatial ultrasound field of Bessel beams, this paper simulated with the use of a circular ultrasonic transducer and a set of concentric annular ultrasonic transducers and compared the simulation results. The results help to find out applied ways of zero-order Bessel ultrasonic field for...
According to inverted pendulum system control error, the method of error analysis and compensation is proposed, which establishes the structural model of inverted pendulum system, elaborates control principles of tilt inverted pendulum system, and studies error causes of inverted pendulum and inclination system error and dynamic error in the control process. But errors involving electric control system...
For a finite group G, f is a function on G, whose value at an element q of G is the number of elements (a, b, c) ?? G ?? G ?? G satisfying abcb-1a-1c-1. By computing the inner products of / with the irreducible characters of G, we prove that f is a character of G, by the regular representation of the center of the complex group algebra, a module construction of f is obtained.
Distributed Virtual Environments like online games or 3D virtual worlds have become very popular in the last few years and a more substantial surge in popularity and use is expected. Because of the huge number of users, such environments will undergo a change of infrastructure from a centralized to a decentralized one, making higher demands on consistency issues. This paper addresses consistency problems...
The recognition of Chinese chess through computer vision includes chess detection and its character recognition, and the process should be fast and robust. In this paper, Robert operator is used to get the edge information of chess, then detection, localization and segmentation of the chess are realized through mathematical morphology and template circle method. A new algorithm based on projection...
Single photon emission computed tomography (SPECT) could achieve the functional image of the organ of interest, so the diseases can be found much earlier. Cone-beam SPECT reconstruction can improve the photo density and spatial resolution of the reconstructed image. A simple method for cone beam reconstruction is to rebin the cone-beam projection data into 2D sinograms and use 2D reconstruction method...
Speed and precision are important for object detection algorithms. In this paper, a novel object detection algorithm based on color histogram and adaptive bandwidth mean shift is proposed. The algorithm is capable of detecting objects rapidly and precisely. It is composed of two stages: a rough detection stage and a precise detection stage. At the rough detection stage, histogram back projection and...
Broadcasting is a common operation in ad hoc routing protocols to resolve many issues. However, blind broadcasting is usually very costly and will result to serious redundancy, collision and contention. In this paper we propose a conditioned forwarding algorithm for broadcasting of on-demand multicast routing protocol. By reducing unnecessary broadcasting of route request packets based on additional...
A weighted average algorithm is proposed, which applies the pricing and trust mechanisms into grid resource allocation. Firstly it identifies malicious nodes according to the weighted average of the trust degree thresholds. Then it measures the comprehensive scores of normal nodes by weighted average of normalized bid prices and trust degrees, and makes resource allocation based on combinatorial double...
Broadcasting is a common operation in on-demand multicast routing protocol to establish and refresh routing table. A straightforward broadcasting by flooding is usually very costly and will result in serious redundancy and contention. A conditioned broadcasting algorithm for on-demand multicast routing protocol is proposed, which computes the rebroadcast probability of packets through neighbor node...
To realize autonomous goal-oriented navigation of a mobile robot in an unknown environment, this paper proposed a fuzzy reactive control method. A virtual target approach under special optimization criteria is applied to resolve trap situation problems such as recursive U-shaped environment. The other topic considered in this paper is the Goal-Unreachable with Nearby Obstacles (GUWNO), such problem...
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.