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.
Semi-fragile watermarking which is robust to given operations and fragile to conscious operations, is a useful authentication technique for digital media. In this paper, a novel semi-fragile image watermarking algorithm that accepts JPEG compression and gray-scale-transformation is proposed. In the proposed algorithm, the properties of JPEG compression, DCT coefficients and gray-scale-transformation...
In text categorization, vectorizing a document by probability distribution is an effective dimension reduction way to save training time. However, the data sets that share many common keywords between categories affect the classification performance seriously. To address that problem, firstly, we conduct an effective term weighting scheme consisting of posterior probability and relevance frequency...
In China, More than 458 cities and more than 50% of the population are distributed in natural disaster-prone areas. It is important to establish a complete post-disaster reconstruction and rehabilitation system to respond to sudden natural disasters. In order to get post-disaster restoration items scheduling, we invited experts to give the fuzzy preference relation coefficients on the restoration...
In cooperative spectrum sensing, the detection performance is affected seriously by the error of channel estimation. Hence, the accurate channel estimation is very necessary. In this paper, the performance of cooperative spectrum sensing under the LMMSE channel estimation method with time-domain windowing technique is analyzed. Simulation results show that the probability of detection can reach high...
A theoretical model is presented for multilayered surface plasmon resonance sensors composed of isotropic materials. In the framework of optical transmission theory in multilayers, by solving Helmholtz equations, the expression of electromagnetic field distribution inside multilayered structures is established. This model is applied in the simulation of surface plasmon resonance characteristics of...
In next generation network (NGN), different access networks are integrated and seamless vertical handoff technique should be performed. Cross-layer design for vertical handoff has gained considerable attention in recent years. In this paper, we give a survey on cross-layer strategy in vertical handoff scheme design including both cross-layer system architectures and cross-layer information interaction...
In this paper, a new method for extracting edges in images is proposed. The local pixel values are normalized to make their sum become unity. Then, a nonlinear filtering process is applied to the normalized pixel values by using the sine or cosine function. Two new edge detection operators, which exploit the local convexity of the sine and cosine functions, are thus defined. The edges are detected...
With the rapid development of EDA technology, many universities have set up the digital design course in the computer science speciality. The digital design course needs SOPC system board to mount FPGA and the appropriate support circuitry. This paper presented the design of extensible SOPC system board. This board has compact structure and embodies the characteristics of SOPC system such as high...
Allocating appropriate channels to the users (UE) is an important challenge in mobile networks. Heuristics Algorithm may be used to solve this problem. In this paper, a new time slot allocation (TSA) algorithm based on genetic algorithm (GA) is proposed after comparing to the dynamic queue TSA algorithm. The new algorithm is simulated and analyzed on the TD-SCDMA Radio Resource Management Simulation...
A new fuzzy genetic algorithm (FGA) is developed to optimize Hilbert fractal defected ground structure (HDGS), designed bandstop filter. The genetic operators (crossover and mutation) are self-adaptively adjusted by fuzzy controller of the algorithm, so convergent character and global optimization are improved. Fitness function is constructed by the HDGS stopband and pass-band transmission characteristics...
We present the design of time parallel trace-driven cache simulation for the purpose of evaluating different cache architectures. Due to the long simulation cycles, traditional sequential simulation methods are no longer practical. An obvious way to achieve fast parallel simulation is time parallel. It splits the whole trace into small slices which are assigned to parallel processors for concurrent...
Group mobility in WSN is of particular importance as it is can be found in many practical application scenarios. In this paper, we propose to combine HIP and NEMO protocol for supporting group mobility in WSN. The overview of HIP and NEMO protocol is introduced and the new network architecture for applying HIP and NEMO protocol in WSN is proposed, which enhances mobility management, network security...
Aim to avoid the deficiency of huge computation load and resource use in conventional fixed-point loop control method, base on the study of signal tracking method and accuracy of navigation receiver, an improved one is proposed, along with theoretical analysis and actual verification of the accuracy loss of signal tracking compared to the floating-point loop control method from the following two aspects...
Fault location is important for attitude determination (AD) of satellite which provides better services without any degradation. Firstly, the assumption of statistically independent between 3-axis Euler angles and statistically independent between Euler angles and faults are proposed in this paper. Also it is assumed the fault appears only in one group of sensors and the fault is additive. With two...
During any extreme event, especially the evacuation in crowded places. The keys to saving lives are orderly and efficient evacuations. We have improved the traditional particle swarm optimization. It can simulate non-adaptive crowd behavior in the crowd facilities during the emergency evacuation. We introduce the concept of the leader (trained staff) and the parameter of influence, and analyzed the...
In this paper, extended towed array measurement and broadband beamforming in frequency domain are combined together to form a new efficient broadband beamforming based on extended towed array measurement (ETAM-FCBF). The angular resolution of this method is higher than the conventional beamforming, and the detection ability of the weak target is more excellent. Moreover, this method is fast enough...
In order to make out the competitive landscape by identifying analysis information of business competitor, an improved CURE algorithm is used in this paper. By assigning weight value to identify element , the method overcomes the limits of representative point lack of represent. And the dynamic adjust of the weight value increases the flexibility of clustering. For the initial clustering results,...
Under the background of TDD mode and LTE-Advanced scene, in this paper, we combine physical network coding with relay technology in order to make physical network coding-decode and forward (PNC-DF) together with physical network coding-amplify and forward (PNC-AF) transfer mode can be used to improve network throughput by using interference. Because of the ability to listen to the multi-user relay...
Nowadays, Graphic printing becomes more and more important to the blinds. Being compared with the embossed printer, New Braille Printer (NBP) utilizes UV-curing adhesive to generate durable Braille dots with lower cost and better quality. Until now, unfortunately, NBP can't print graphic. Thus, in this paper, a graphic printing method for NBP has been introduced which utilizes zooming-edge-detection...
For better user personalization, this paper explores the collecting and processing method of network users' behavior data with multi-source heterogeneity and analyzes network user behavior on the basis of context by the theory called Situation Awareness. Then, a new efficient algorithm is presented by using internet context to ensure the model of user interest auxiliary. Further, a structure model...
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.