Reconstruction of symmetric models composed of analytic curves and surfaces from point cloud

This paper presents a method to reconstruct symmetric geometric models from point cloud with inherent symmetric structure. Symmetry types commonly found in engineering parts, i.e., translational, reflectional and rotational symmetries are considered. The reconstruction problem is formulated as a constrained optimization, where the objective function is the sum of squared distances of points to the model, and constraints are enforced to keep geometric relationships in the model. First, the explicit representations of symmetric models are presented. Then, by using the concept ofparameterized points （where the coordinate components are represented as functions rather than constants）, the distances of points to symmetric models are deduced. With these distance functions, symmetry information, for both 2D and 3D models, is uniformly represented in the process of reconstruction. The constrained optimization problem is solved by a standard nonlinear optimization method. Owing to the explicit representation of symmetry information, the computational complexity of our method is reduced greatly. Finally, examples are given to demonstrate the application of the proposed method.     

基于鲸鱼优化算法的配电网故障区段定位

为提高配电网络中故障区段定位的准确性和高效性,基于馈线终端单元的配电网区段定位的研究,提出了一种在含分布式电源的配电网中用鲸鱼优化算法实现故障区段定位的方法。通过MATLAB对支路矩阵、电源接入情况进行编程,创建含多电源的IEEE33节点的配电网模型,完成配电网故障信息编码方式、开关函数和适应度函数的构造。对发生单点故障、多点故障,以及存在信息畸变的情况下发生故障的定位结果分析,结果表明,提出的鲸鱼算法能实现准确定位,其收敛性、准确性和高效性均优于传统粒子群算法、遗传算法以及最近的蝠鲼觅食算法。     

面向我国企业ERP系统建设的管理咨询服务

本文在分析我国企业ERP系统建设概况和失败原因的基础上，指出管理咨询公司在我国企业ERP系统建设中可充当企业的导师、ERP厂商的助手和企业与ERP厂商之间沟通的桥梁的角色，进而详细分析了管理咨询公司在规划制定、软件选型、业务流程调整和技术实施四个阶段的业务重点，并用案例分析的方法加以验证。     

一个关于发展中国家经济增长的模型

本文在前人研究的基础上，对发展中国家引进发达国家技术的经济增长模型进行了部分改进，通过动态最优化的方法，得出了一个四维系统，并分析了系统的稳定性。最后，对发展中国家引进技术与经济增长的若干规律进行了讨论。     

鄱阳湖生态经济区水资源供需系统仿真与优化

运用系统分析的理论与方法对区域水资源供需平衡问题进行系统分析,构建鄱阳湖生态经济区水资源供需系统模型,通过调整控制变量和相关参数,预测区域水资源供需的变化趋势,仿真该区域在2011—2030年期间水资源供需情势,设计维持现状、经济优先、节水优先和协调发展等四种模式进行对比分析并优选方案,为科学制定鄱阳湖生态经济区水资源规划、高效配置提供依据,为江西省开展生态文明先行示范区建设提供决策参考。     

黑龙江省中小企业优化、振兴对策

在探讨了黑龙江省中小企业在振兴全省经济、稳定社会生活中的战略地位、作用的基础上，分析了中小企业发展潜力和制约因素，提出了促进中小企业优化、振兴和发展的对策。     

基于层次序关系分析法的政府应急管理网站优化评估

针对国内较少有文献对"政府应急管理网站优化评估"进行研究的情况,本文基于IA理论构建了应急管理网站的评价指标体系,探讨了一种基于层次序关系分析法的政府应急管理网站综合评价方法。该方法结合层次分析法和序关系分析法的优点,采用专家赋权和公众评分相结合的思想,对应急管理网站建设进行定性和定量的评价。结果表明,对于应急管理网站的综合评价,层次序关系分析法相比传统的层次分析法简单实用;且与一般的序关系分析法相比,减少了专家每次排序的指标数量,操作起来更加方便,值得推广和使用。     

卡诺热泵的最佳泵热率

研究在非线性传热情况下,热阻和有限速率过程对卡诺热泵性能的影响.导出了最佳泵热率与致热系数之间的关系,并进行了讨论.     

成本动因合并模型在高新技术企业中的应用

在对高新技术企业成本管理的特性进行分析的基础上,制定了成本动因选择的原则,分析了成本动因合并原理,研究了成本动因合并模型及其应用方法,旨在为高新技术企业进行成本动因合并和成本决策提供借鉴和方法支持。     

Robust fault detection for a class of nonlinear time-delay systems

In this paper, the robust fault detection filter (RFDF) design problems are studied for nonlinear time-delay systems with unknown inputs. Firstly, a reference residual model is introduced to formulate the robust fault detection filter design problem as an H_∞ model-matching problem. Then appropriate input/output selection matrices are introduced to extend a performance index to the time-delay systems in time domain. The reference residual model designed according to the performance index is an optimal residual generator, which takes into account the robustness against disturbances and sensitivity to faults simultaneously. Applying robust H_∞ optimization control technique, the existence conditions of the robust fault detection filter for nonlinear time-delay systems with unknown inputs are presented in terms of linear matrix inequality (LMI) formulation, independently of time delay. An illustrative design example is used to demonstrate the validity and applicability of the proposed approach.