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In this paper we construct a new kind of basis functions of Bézier curve with single shape parameter, and then by these basis functions we give a practical algorithm of curve modeling. We discuss some important properties of the basis functions and the corresponding curves. Further, we extend our study to the tensor product surface with two shape parameters. We construct the new basis functions of...
A kind of mixed tensor product Bernstein-Poisson basis function is presented in this paper. Some important properties of this kind of basis function are discussed and mixed tensor product Bézier-Poisson surface is defined based on it. The basic properties of the such surface are discussed. Via de Casteljau algorithm, the evaluation algorithm and subdivision algorithm for mixed tensor product Bézier-Poisson...
Networked control system (NCS) regards communication network as a part of real-time control system, where the control system components use the communication network to exchange data, in order to realize the closed-loop control of plant. In this paper, a math model of NCS is given firstly according to NCS with delay and packet dropout; then in the basis of the math model and a plant of two-tank system,...
Mobile applications are becoming more and more powerful yet also more complex. While mobile application users expect the application to be reliable and secure, the complexity of the mobile application makes it prone to have faults. Mobile application engineers and testers use testing technique to ensure the quality of mobile application. However, the testing of mobile application is time-consuming...
Aimed at the needs for scheduling real-time tasks in the environment of open real-time system and embedded system, a scheduling mechanism based on messages has been suggested and applied on the Xen virtual machine, and a Multi-Real-Time-Task model based on VCPU is established. Influence on the real-time scheduling is analyzed and solutions will be given. Experiment results prove that scheduling based...
The failure mechanism of YXR3, a kind of matrix-type high speed steel (HSS), which is widely used in cold forging tooling, was studied in this paper. Through metallographic analysis of YXR3 in different conditions, such as before and after heat treatment and mechanical tests, the metallurgical structures and changes of the steel were analyzed. The failure analysis was conducted to specimens of uniaxial...
Safety-critical systems have to work correctly and meet time constraints even in the presence of faults. Hardware fault-tolerant technology can provide a high level of reliability, but custom-designed hardware and operating system are too costly to be accepted by most common applications. At present, some research works about hot-spare fault-tolerant systems based on virtualization technology have...
With the rapid advance of computer and network technology, more and more applications are deployed in the customer-side network. These applications require different quality of service (QoS), but have to share a few bandwidth limited Internet connections. Owing to the IP network's best-effort delivery mechanism, the QoS requirements are hard to be satisfied. There have been plenty of QoS solutions...
This paper introduces that water source heat pump is successfully used in Xiangtan city. The PID fuzzy control method of water source heat pump is brought forward for the reasons of complicacy of water source heat pump system, plenty of controlled variables, nonlinear, time delay characteristic and bad adaptability. This method can get high precision, rapid dynamic response and work well in reality...
The signal identification technology is applied in tertiary recovery of oil field, which is based on that everything has own resistivity. The artificial physical models are established basis on the heterogeneity of Daqing oilfield main oil layers. The matrix of reservoir does not conduct electricity, but the water with salt in the reservoir can. So the electrodes are inserted in the physical model...
Based on genetic algorithm, a new method of ISAR motion compensation is presented in this paper. Aiming to guarantee that GAMIC (genetic algorithm of maximum image contrast) and GAMIE (genetic algorithm of minimum image entropy) converge on the optimum solution, the optimum individual preserved tactical is adopted. Aiming to reduce the heavy computation of GAMIC and GAMIE, the minimum distance and...
Providing single system image (SSI) on clusters has ever been one of the hot topics in the research field of parallel computer architecture, since SSI supports easier programming and administration on clusters. Currently, most SSI studies focus on the middleware level of clusters, leading to some problems of poor transparence, low performance and so on. This paper presents a novel solution to provide...
It is an important direction of the development of parallel computer architecture to implement single system image (SSI) on clusters, since SSI supports easier programming and administration on clusters. Currently, most SSI studies focused on the middleware level of clusters, leading to some problems of poor transparence, low performance and so on. This paper presents a novel solution to provide SSI...
As a packet is distributed along its path in a wormhole network-on-chip (NoC), the individual link schedulers can hardly fulfill packet-based allocation without synchronization, to achieve lower average latency than flit-based one does. Reverse anchored round-robin (RARR) is proposed as hybrid of flit and packet based schemes. The unique highest-priority fragment is reserved as anchor at each link...
Distributed time synchronization is an important part of sensor networks. Due to the limited battery capacity of the sensor nodes, applicable schemes should concern the energy consumption of the networks. To achieve better efficiency, an event-triggered time synchronization scheme (ETTS) is presented, which aims at providing on-demand time synchronization in sensor networks. The scheme is composed...
With the growing people's demands for a variety of daily life and work information at anytime, anywhere, in this paper, we present a new mobile applications scenario. Sensors, a large number of mobile phones, PDAs, and laptop computers self-organize into a hybrid ad hoc and sensor network. A small portion of mobile phone nodes from the hybrid network can be chosen as long-range nodes to communicate...
Mobile IP protocol, a standard proposed by the Internet Engineering Task Force, was designed to support IP mobility. On the basis of analysis of Mobile IP protocol, it can be concluded that some problems (e.g., security flaws, limited agents deployments, triangular routing and just a little supports by operating systems, etc.) remain to be solved. In this paper, we present a novel mobility supporting...
In this paper, first we briefly introduce the conception of virtual reality, virtual reality modeling language and virtual reality technical application domain. We also analyze the current situation of the modeling language in the development of virtual reality technology. We then present some challenging issues in this area. We finally design a structure to implement an intelligent virtual reality...
The paper describes characteristics of millimeter wave active phased array radar (MWAPAR), introduces scheme and architecture of millimeter-wave radar based on active electronically scanned antenna (AESA), and discusses several key problems related to system design. Experimental results of measurements of its performance are also presented and potential applications are finally discussed
This study investigates the infrared radiant characteristics of human acupoints and meridian-like structure by use of infrared thermal imaging. Thirty healthy youth volunteers are studied in our experiment. We find that human acupoints and meridian-like structure can be visualized or revealed in the infrared spectrum range in some of them under natural condition. The infrared radiant tracks of meridian...
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