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In this paper, a complex-envelope (CE) scheme is introduced into the locally one-dimensional finite-difference time-domain (LOD-FDTD) method for the extraordinary optical transmission (EOT) analysis of periodic metallic gratings. The dispersion of the metal, caused by the evanescent waves propagating along the interface between the metal and dielectric materials in the visible and near infrared regions,...
In this work, the numerical dispersion of the three-dimensional (3-D) finite-difference time-domain (FDTD) method with weighted Laguerre polynomials (WLP) is presented. The phase velocity of numerical wave modes is relevant to the direction of wave propagation, grid discretization and time-scale factor. Additionally, the unconditionally stability for marching-on-in-order WLP-FDTD scheme, with the...
In this paper, an artificial neural network (ANN) model based on data mining techniques is proposed for parametric modeling of antennas. Compared with the traditional ANN, the proposed model with data mining can achieve the trained model with small training datasets and accurate results. The validity and efficiency of the proposed method are confirmed with a U-slot patch antenna.
This paper proposes a model based on a machine learning algorithm, extreme learning machine (ELM), and the pole-residue-based transfer function (TF) for parametric modeling of electromagnetic behavior of microwave components. Compared with the model based on the artificial neural network, the proposed ELM model can obtain the accurate results for microwave passive component design with the small training...
In this paper, the Newmark-Beta algorithm is introduced into the finite-difference time-domain (FDTD) method in dispersion media, resulting in an unconditionally stable method for periodic metallic grating analysis. The proposed method eliminates the Courant–Friedrich–Levy constraint and improves the simulation efficiency for multiscale problems. The dispersion of the metal, which is caused by the...
In the light of the operation of Jiuquan wind power base in recent years, the new relaying protection methods for enhancing the accommodation and transmission of large scale wind power are proposed from the system perspective, including the criterion of flow fluctuation based on the statistical analysis, the flow transfer recognition based on the local information, the adaptive overload protection,...
In this paper, a frequency-dependent locally one-dimensional finite-difference time-domain (LOD-FDTD) method is developed for the extraordinary optical transmission (EOT) analysis of periodic metallic gratings. The dispersion of the metal, caused by the evanescent waves propagating along the interface between the metal and the dielectric materials in the visible and near infrared regions, is expressed...
In this paper, a generalized auxiliary differential equation (ADE) technique is utilized to develop a frequency-dependent locally one-dimensional finite-difference time-domain (LOD-FDTD) method for the extraordinary optical transmission (EOT) analyses of periodic metal gratings. The LOD-FDTD method is an unconditionally stable method which is not restricted by the Courant-Friedrich-Lewy (CFL) stability...
Nowadays, as the development of mobile communication, it is very important to serve users. Because of the subjectivity of user experience, the data of user experience has deviation. In the paper, a cooperative modeling method based on the improved Support Vector Machine is proposed, which can evaluate the quality of experience by using measurement report. The results of the experiments show that our...
Because network security has become one of the most serious problems in the world, intrusion detection is an important defence tool of network security. In this paper, A cooperative and adaptive intrusion detection method is proposed and a corresponding intrusion detection model is designed and implemented. The E-CARGO model is used to build the collaborative and adaptive intrusion detection model...
In order to display and output HDR(High Dynamic Range) images on the conventional equipments, this thesis proposed a new kind of HDR image tone compression algorithm based on local environmental luminance factor. The workflow of new algorithm is based on the latest image color appearance model iCAM06, as shown in Fig.1. The new algorithm decomposed the original HDR image into the base layer image...
The MPEG-7 standard provides a description of multimedia data, however high-level semantic of multimedia data is beyond the scope of the MPEG-7 standard. As ontology is an effective tool of semantic modeling, high-level semantic of multimedia data can be modeled using ontology. In this study, we propose a multimedia ontology modeling approach based on the MPEG-7 standard. The three main features of...
A novel architecture of RFID transmitter is presented in this paper which is based on digital intermediate frequency (IF). The design includes digital baseband and CORDIC (Coordinate Rotation Digital Computer) based SSB (single side band) and DSB (double side band) modulator in intermediate frequency. Parameters of this design are compliant with the ISO/IEC 18000-6 type C standard. The digital baseband...
Global land cover is the characterizations of Earth's surface, and it has been recognized as key drivers of biodiversity changes. Most biological conservation studies are focused on using land cover data to study the pattern of biological environment. However, few studies considered the accuracy of land cover products, which may induce further errors. Ecologists should be aware of those problems before...
This paper revisits the problem of designing a static anti-windup gain for enlarging the domain of attraction of the resulting closed-loop system. By utilizing a composite quadratic Lyapunov function, which was originally proposed to study the stabilization problem for linear systems under actuator saturation, an existing LMI based design algorithm is enhanced to result in a nonlinear, possibly continuous,...
The usability problems of CSCW system mainly come from two aspects of limitation. On the higher level, it lacks sufficient simulation of the use-context influenced by social, political and organizational features; on the lower level, it lacks suitable measurement and description of basic collaborative behavior happened in common cooperative activities. However, the traditional task-based user interface...
Usability is an important measurement of software quality. Effective usability evaluation method and analysis technique on usability data always help to achieve high usability. A numerical measurement in usability evaluation can facilitate the comparison between different designs of product prototype. In this paper, we propose a simulation approach based on FSM to abstract the user interface rules...
Because of the higher resolution, the data volume of remote sensing image is very large. To communicate and use them on network, efficient compression is very important. Based on the frame of conventional JPEG2000 compression, this paper puts forward a kind of modified compression algorithm aiming at characteristics that the correlation of remote sensing image is lower than common images. The core...
Most undergraduate IT education in China, including computer science, informatics engineering and automation, always ignores the role of usability engineering in product design at present. This paper examines the development and trend of usability engineering aspect research in Western countries, describes the close and important relationship between usability engineering and IT (especially in computer...
Usability evaluation is traditionally used in the late stage of software development process. However, to some high-cost complex distributed collaborative software, such late-usability-evaluation or single-user-oriented usability inspection are unsuitable in modern situation. The early stage of evaluation always relies on a task model (interface model) to simulate the actions of real user. However,...
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