零件设计域到制造域的特征映射机理研究与应用

通过对特征映射机理及其映射过程的分析，提出一个基于零件特征模型、面向井行工程的特征映射系统。系统由预处理、筛选、提取及聚合等四个子系统组成，完成零件从设计特征到制造特征的映射，从而实现零件在特征层上的信息转换。以实例对系统进行验证。     

基于跨棒(球)测量的渐开线圆柱齿轮测绘

根据齿轮几何学的基本理论，在总结实际测绘工作经验的基础上，提出了基于跨棒（球）测量的齿轮基本参数测量与确定方法。该方法可以较准确地确定出被测齿轮的基本参数，是一种较实用的测量技术。     

Special-shaped tube drawing forming and conformal optimization of die cavity

Aiming at the issues in quick processing and modeling design of drawing special-shaped tube die, by Conformal Mapping Theory and the numerical trigonometry method of interpolation between odd points and even points, the conformal mapping function is obtained. As the result, three-dimension drawing forming were converted into that of two-dimension problems, and the plastic stream function was analyzed, die cavity modeling and its optimized function were set up. Combining with modern processing technology, NC program and CAM of die cavity can be realized. Taking the drawing forming of hexagon tube with arc radii r and ellipse-shaped tube as instances, the drawing die cavity optimization of special-shaped tube was achieved, as well as, the changing principle of wall thickness was analyzed.     

Surface quality of extruding metal special-shape products and frictional behavior in optimized die cavity

With the help of Complex Function Mapping theory, the complicated three-dimensional deformation problems are transferred into two-dimensional problems, and the function of strain ratio field is analyzed in the metal plastic extruding deformation. Taking the strain-hardening effect of metal deformation into account, the relationship between friction behavior and optimized mathematical model is analyzed by the numerical analysis friction energy dissipation function. As a result, the method of lowering the material hardening and decreasing the reduction ratio over multi-procedures can be used to improve the surface quality of metal special-shape extrusion products.     

Three-dimensional superconvergent patch recovery method and its application to data transferring in small-strain plasticity

In this paper, a 3D Superconvergent Patch Recovery (SPR) method is developed for data transferring in elasto-plasticity. The transfer operators are presented for mapping of the state and internal variables between different meshes. In order to transfer the history-dependent variables from old mesh to new one, the internal variables are firstly mapped from the Gauss points to nodal points of old mesh, the variables are then transferred from nodal points of old mesh to nodal points of new mesh, and the values are finally transferred from the nodal points to Gauss points of new mesh. As the solution procedure cannot be re-computed from the initial state, it is continued from the previously computed state. Aspects of the transfer operators are presented in 3D superconvergent patch recovery technique by fitting the best polynomial function with C ₀, C ₁ and C ₂ continuity. Finally, the efficiency of the proposed model and computational algorithms is demonstrated by several numerical examples.     

HDR视频映射算法研究

基于对传统伽马指数函数、及最新Dolby PQ函数的深入研究和分析,针对采用Dolby PQ函数编码的HDR视频节目内容,提出直接将编码亮度在范围内的视频图像像素映射至电视机屏幕进行保真显示、而采用亮度压缩方式将其他高亮和低亮视频图像像素映射至电视机屏幕进行显示的HDR视频映射算法;试验证明能够将HDR视频源内PQ函数编码的像素亮度映射至电视机屏幕显示亮度的动态范围之内,保证视频源图像内容能够较真实的在电视机屏幕上显示,避免了HDR视频图像显示时出现内容丢失;以及算法且易于实现、能够快速进行商业应用.     

A frame-based knowledge representation model and its mapping to nested relations

The first part of this paper introduces the basic constructs of a frame representation model and gives a formal definition for them. Subsequently the nested relational model (NF²) is described as an extension of the classical relational model to support relation-valued attributes. In the second part of this paper both models are compared with each other and a mapping of frame representation structures to NF² structures is specified. The structural similarities between frames and NF² relations are made clear and it is shown that their main difference is due to the type polymorphism introduced by the concept hierarchy of the frame model. This causes type collisions to occur in the strictly typed NF² model when frames are directly mapped to NF² structures. Two solutions to this problem are suggested and compared. The paper concludes with a reformulation of query operations of the frame model in terms of NF² algebra operations.     

J2EE项目中数据访问策略的选择

本文介绍了目前J2EE项目数据访问策略的选择，其中重点描述了O／R映射这种数据访问策略的特点及其适用的最佳条件，它可以帮助我们在项目的开发阶段通过清晰的映射方案构造出高效率的DAO层，为项目的成功打下良好的基础，特别是对于项目的式样变更以及后期维护．这种数据访问策略提供了最大程度上的灵活性。     

Application of geographical information systems to rural electrification with renewable energy sources

This paper approaches one of the main problems of rural electrification: the choice of the most appropriate technology for each case. The main objective of this project is to apply Geographical Information Systems (GIS) to divide the research zone into areas in that are more appropriate for either conventional or renewable technologies. The approaches for choosing among the different technologies are usually technical and economic; these may be jointly considered by the leveling electric cost (LEC). Determination of the LEC is a complex task that requires knowledge of the capacity factor. This paper shows the conclusions of the technical and economic parameter analysis involved in the determination of the LEC for each technology. This analysis has allowed us to carry out proposals of improvement in the methodology of the GIS of rural electrification. The resulting GIS has been verified in the municipality of Lorca (Murcia, Spain).