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Electromagnetic catapult launch tends to be equipped on future carrier deck gradually. This paper aims to establish the mathematical representation of the system of electromagnetic aircraft launch considering aspects of carrier, aircraft and electromagnetic catapult. The proposed catapult system is evaluated by conducted simulation considering disturbance of deck wind and ground effect during stroke...
At present, the robot, based on AIML, is widely applied in many fields. AIML has become a heavily researched subject. By reading numerous published studies from all over the world, the authors have developed a detailed overview of AIML based on the current research status and development in Chinese applications. This paper is separated into three primary sections: the Introduction of AIML, problems...
Ultra wide band system is a short-haul wireless communication with advantages of low power consumption, high data rate, resistance to interference, co-existence with narrowband systems and so on. A new-type ultra wide band antenna is proposed to solve the problems of miniaturization and integration. To realize on-chip system and combine with other functional microwave monolithic integrated circuits,...
This paper implements a visual tool for the quick customization of virtual characters in 3D virtual worlds with a three-layer structure based on the Open Sim and Second Life platforms and "Knowledge" theory. "Knowledge" refers to specific controlling conditions and the corresponding behaviors of virtual characters. The three-layer structure is divided into the data layer, entity...
Through scene construction and intelligent interaction in a 3D virtual world environment, we developed the project "Confucius' Journey". Considering the problems in such applications, such as the lack of interaction and reduced effectiveness in representing the application purpose, we explored interactive objects and virtual human technology. In addition, we can verify the advantage of using...
The particle of the PSO algorithm is lack ofparticle diversity, and this makes itself fall into thelocal extremum, which leads to the premature. Basedon a large number of experimental analysis, this paperindicated that the reason that lead to the lack of thePSO algorithm's particle diversity is that PSOalgorithm's rapid convergence and the smallprobability of the particle speed divergence.According...
This article contains a study and improvement of the quadric error metric (QEM) algorithm. In the process of implementing a QEM algorithm, we improved the classical QEM algorithm for the retention of thin and sharp terminals. Some scholars proposed an improvement based on discrete curvature weighting of the vertices, but it still has shortcomings. We suggest an improvement based on discrete curvature...
Transition techniques play a vital role during the evolvement process of the Internet from IPv4 to IPv6. However, packet length change during the forwarding process may result in fragmentation and reassembly of a large number of packets, which greatly impacts the forwarding performance. In addition, different Maximum Transmission Unit (MTU) mechanisms of IPv4 and IPv6 have also brought lots of troubles...
Millimeter wave of microwave is the important wave band for the modern communication system. Waveguide slot array antenna which has used for both wired and wireless communication is the hot and difficult point of current research in the millimeter wave band. This paper takes slot array in broad wall of rectangular waveguide as the research object to improve the formulas designing for the circularly...
An ultra-wideband (UWB) antenna with a notch band using a pair of I-shaped parasitic elements is presented. The antenna is a planar structure and has a compact area of 25×25 mm2. The antenna has a circular slot cut in the ground plane and a circular patch is printed within that, meeting the ultrawideband applications. A 50Ω coplanar waveguide (CPW) transmission line is used to feed the printed circular...
The transient voltage distribution on the core wire and outer semiconductor layer of the XLPE cable winding which is under lightning surge is discussed. The transient voltage with certain amplitude on the outer semiconductor layer of the cable winding would be measured because of the special characteristics of the cable winding structure, which is very different with transient characteristics of the...
Catastrophe control generally means to design a controller that is capable of modifying the catastrophe characteristics of a catastrophe nonlinear system, so as to achieving some desirable dynamical behaviors. A typical objective is to delay and/or stabilize an existing catastrophe. In this paper, we consider the catastrophe control in another way, that is, a certain catastrophe is created at a desired...
In this paper, a novel method is developed to solve the problem of underdetermined blind source separation, where the number of mixtures is smaller than that of sources. Generalized Gaussian Distributions (GGDs) are used to model the source signals and generative Continuous Density Hidden Markov Models (CDHMMs) are derived to track the nonstationarity inside the source signals. Each source signal...
In this paper, we present a novel adaptive tap algorithm for partial update adaptive filters used in network echo cancellation. As the channel is typically long and sparse, it is unnecessary and inefficient to update all of the taps. Although partial update algorithms can be used to solve this problem, it is difficult to predetermine a fixed number of partial-update taps without a priori knowledge...
This paper proposes a simple real-time method for modeling and rendering clouds. The density of cloud is formed by simulating projected motion of cloud particles into 2D plane. And then we render it by using an algorithm that approximates single forward scattering in real-time. This method does not require any preprocess to shade the cloud. By using this method one can create a cloud very quickly...
At present, the lack of emotion is very serious in E-Learning. A solution is proposed in this paper. The importance of emotional education is discussed; the feasibility of emotional education is indicated based on virtual reality in E-Learning, including theories and advantages; the method of emotional teaching design is put forward; the emotional education system is designed and implemented in the...
This paper addresses the blind source separation of convolutive and temporally correlated voice mixtures. We combine natural gradient algorithm and temporal complexity algorithm to preserve the temporal and frequency structures of the original signals. Due to the underlying scaling constraint of natural gradient algorithm, the low frequency components of the original sources are suppressed in the...
High frequency chest compression (HFCC) treatment systems are used to promote mucus transport and mitigate pulmonary system clearance problems to remove sputum from the airways in patients with Cystic Fibrosis (CF) and at risk of developing chronic obstructive pulmonary disease (COPD). Every HFCC system consists of a pump generator, one or two hoses connected to a vest, to deliver the pulsation. There...
High frequency chest compression (HFCC) is used as a method to remove the mucus in the airway for cystic fibrosis (CF) patients. As the characteristics of the tracheal sound reflect the conditions of airways, in this paper, we propose a novel method to evaluate the respiratory patterns in HFCC therapy by using single channel tracheal sounds only. The difficulty of analyzing tracheal sounds lies in...
In order to obtain high quality pictures, the thermal design is necessary for the space telescope. The designed temperature scope should meet to the permissible temperature tolerance of the telescope. A method for calculating the permissible temperature tolerance of the telescope is studied. The calculating temperature tolerance will be targeted for space thermal environment adaptive structure design...
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