Applied Mechanics and Materials Vols. 220-223

Abstract: Cloud is a common, widespread natural phenomenon. Cloud modeling and rendering plays a great important role in virtual environments. This article based on texture splatting on particles method, and considers the clouds as a grade model. A method based on fractal is chosen to generate cloud texture and then texture is mapping to the facets. The method introduced in this article is simple and can improve the cloud modeling velocity. The results show that the method can meet the common requirements in scene simulation and have a good performance in real-time and reality.

Abstract: Evolutionary algorithms are amongst the best known methods of solving difficult constrained optimization problems, for which traditional methods are not applicable. Due to the variability of characteristics in different constrained optimization problems, no single evolutionary with single operator performs consistently over a range of problems. We introduce an algorithm framework that uses multiple search operators in each generation. A composite evolutionary algorithm is proposed in this paper and combined feasibility rule to solve constrained optimization problems. The proposed evolutionary algorithm combines three crossover operators with two mutation operators. The selection criteria based on feasibility of individual is used to deal with the constraints. The proposed method is tested on five well-known benchmark constrained optimization problems, and the experimental results show that it is effective and robust

Abstract: This paper aims to design the active-learning-based theme crawling system and to realize the capacity of active learning of theme crawling by the use of semantic functions of ontology. The most conspicuous feature of this crawling system is the introduction of iterative process of ontology-incremental active learning. With the above circulating iterative process, the system can capture large quantities of theme-related web pages and the relatedness of the obtained web pages and the capturing rate are obviously superior to the crawling system without the ontology.

Abstract: According to the space structure of octree and the neighbor of octree node，a new algorithm for calculating the boundary representation of octree model is put forward. The algorithm is started by minimum nodes of octrees and then gradually to increase into the biggest node of octrees, thus avoided the decomposition of some node effectively. For raising the calculation efficiency of algorithm, the integral “bit” is used to record the status of node and carry on judging. Theory analysis and examples validate the rationality and efficiency of the algorithm.

Abstract: Three-dimensional Geologic body modeling is one of the core problems in geological information system. The current situation of three -dimensional geographic information system (GIS) and method of space modeling were analyzed in geological field, a kind of three-dimensional geological space modeling method-Similar Tri-Prism(STP) was put forwards, STP Combined with the characteristics of Geological body engineering. This method took Similar Tri-Prism body as the basic volume element of three-dimensional geological modeling, and described the data structure of Similar Tri-Prism body by using five basic elements and six groups of topological relationships. It can effectively express all kinds of three -dimensional geological phenomenon, can better combined with traditional multi-layer triangular irregular network (TIN) model, as well as maintain the topological relationship of space entity. An initial prototype has been developed basing on the modeling method in this paper and proved by real drilling data,which is suitable for three -dimensional GIS in geological field.

Abstract: Visual technology and three-dimension modeling of Geologic bodies have important meaning in the fields of geological research and resource explore. Based on TIN surface, this paper realizes the model reconstructing of stratified geological entity three-dimension, with the aid of three-dimensional graphic library OpenGL, the visualization and any section view of geological three-dimension model can be achieved, which offers powerful support for excavating the information of 3D geological model

Abstract: We construct an efficient and novel identity-based strong designated verifier signature (IBSDVS) scheme based on bilinear pairings, and provide the security proofs and efficiency analysis for the proposed scheme. Our IBSDVS scheme achieves higher efficiency and satisfies all the security requirements of the designated verifier signatures in identity-based cryptography.

Abstract: Abstract. This paper presents an implementation of the Ladder Diagram edit module based on VC multi-document application. The module includes a ladder bitmap data processing, development of the main program interface, and text parameters can be edited, as well as insert and delete functions in the ladder diagram editor module to achieve. The advantage is the use of multi-view characteristics of the MDI application for the system to build a good interface for editing, and editing interface can be directly set and change parameters.

Abstract: Full Function Point measurement method (COSMIC-FFP) is too abstract and difficult to be applied to object-oriented software. By analyzing the notional relationship between main components of UML and main elements of COSMIC-FFP, we establish 22 measurement mapping rules, propose UML-Based COSMIC-FFP method and list the measurement process and measurement steps. An example is given and the results show that this method can measure the functional size of object-oriented software objectively and effectively.

Abstract: In order to make the class distribution be close to Gaussian distribution, a hyperspectral images terrain classification method is presented base on power transformation (PT). Firstly PT is performed to original hyperspectral data to improve the class distribution Gaussianity, and then direct linear discriminant analysis (dLDA) is used to extract features, finally Bayesian classifier is designed in the achieved feature subspace for recognition. Experimental results based on airborne visible/infrared imaging spectrometer (AVIRIS) hyperspectral image show that, with data power transformed, the recognition rate of Bayesian classifier is dramatically improved, and the feature extraction effect of dLDA is enhanced to a certain degree.