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In order to address the efficient issue of the topological shape optimization problem, this paper presents a parametric level set method for the problem of continuum structures by using the Radial Basis Functions (RBFs). The level set-based method is introduced to implicitly represent the free boundary of a structure. To evolve the level set front, the Wu's compactly supported radial basis function...
Spatial patterns of Bemisia tabaci adults in different growing periods of tobacco (Zhongyan-100) were studied based on the analysis of geostatistics to lay the theoretical foundation for sampling, monitoring and integrated control of B. tabaci. From tobacco transplantation to June 5th, the spatial pattern of B. tabaci adult was random. From June 12th to Sep. 18th, the semivariogram curves of B. tabaci...
Performance of a parallel manipulator heavily relies on its position/orientation resolution. Without a good resolution the manipulator is difficult to achieve a high stiffness. Therefore how to obtain the required resolution is a basic issue to design a parallel manipulator. This paper presents a method to solve the problem. Firstly, the mathematical definition of the position/orientation resolution...
This paper proposes an approach based on graph isomorphism to find the correspondence in relational matching. We describe a pseudo-automorphism group as Pseudo-aut (G) of a graph G, which is a set of all pseudo-automorphisms of G. We discuss some properties of the Pseudo-aut(Cn) and the relationships between various elements, establish the relationship between the pseudo-isomorphic and the perfect...
Wireless Sensor Networks (WSN) get more and more attentions in recent years. Most of WSN research focus on routing and data aggregation, but only a few papers discuss the QoS area. In an earlier work, an approach based on the Gur game was introduced. The Gur game-based scheme does not consider the coverage of active sensors. If the active sensors are distributed too densely or too sparsely, this may...
The search for motifs in a DNA sequence set is a generic problem area that is of great interest bioinformatics. Given a set of n DNA sequence and a support-rate threshold tau, it is useful to find maximal patterns that occur in at least taun sequences in the set. This paper presents an efficient approach to find motifs for any support-rate threshold and without any miss. The idea is to prune the candidate...
This note deals with the problem of robust Hinfin control for uncertain singular stochastic systems with state delay and Brownian motion. The state feedback control laws are designed to guarantee that the resulting closed-loop system is regular, impulse-free and mean-square asymptotically stable for all admissible uncertainties. And a prescribed Hinfin performance is achieved in the robust Hinfin...
The preparation of mesocarbon microbeads (MCMB) had been carried out by heat-treating a medium coal tar pitch at 420degC for 2 hours in the presence of aluminum chloride(AlCl3). A larger number of MCMB with small diameter were obtained. The isolated MCMB were observed by scanning electron microscope. The average diameters of the MCMB were measured by laser particle size analyzer. The Pl(pyridine insoluble)...
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