Random binary search tree with equal elements

We consider random binary search trees when the input consists of a multiset, i.e. a set with multiple occurrences of equal elements, and prove that the randomized insertion and deletion algorithms given by Martínez and Roura (1998) [4] produce random search trees regardless of multiplicities; even if all the elements are equal during the tree updates, a search tree will maintain its randomness. Thus, equal elements do not degenerate a random search tree and they need not to be handled in any special way. We consider also stability of a search tree with respect to its inorder traversal and prove that the algorithms used produce stable trees. This implies an implicit indexing of equal elements giving another proof that multiplicities do not pose problems when maintaining random binary search trees.     

An efficient multigrid preconditioner for Maxwell’s equations in micromagnetism

We consider a system of Maxwell’s and Landau-Lifshitz-Gilbert equations describing magnetization dynamics in micromagnetism. The problem is discretized by a convergent, unconditionally stable finite element method. A multigrid preconditioned Uzawa type method for the solution of the algebraic system resulting from the discretized Maxwell’s equations is constructed. The efficiency of the method is demonstrated on numerical experiments and the results are compared to those obtained by simplified models.     

The Effect of Product Type on Consumer Preferences for Website Content Elements: An Empirical Study

This study attempts to demonstrate empirically how the importance of website content in online purchasing varies across 2 product categorizations: goods versus services and hedonic versus utilitarian products. We conducted an experiment that showed that when purchasing services, customers value evaluative elements and risk‐reducing content, while consumers buying goods may be satisfied with fewer features. In addition, selling hedonic products could be more effective when focusing on large and unique assortment. Websites selling utilitarian products, on the other hand, may profit from investing in instrumental website content. The study validates the guiding role of product type in website design, and suggests that incorporating product tactics into design likely contributes to the development of websites tailored to specific consumer groups.     

Dielectric‐coated conducting curvilinear surface electrostatic model for spacecraft charging applications

In this article, free space capacitance of dielectric‐coated conducting curvilinear surfaces is obtained using method of moments (MOM). The surfaces are discretized using triangular subsections. The curvilinear surfaces are represented by quadratic parametric elements. The MOM based on the pulse basis function and point matching is used. The integrand is divided into a regular and a singular part. The regular part of the integral is numerically evaluated by using the Gaussian quadrature algorithm for triangles. The Duffy transformation is used to evaluate the singular part of the integrals. Computed results are given for the capacitance of the dielectric‐coated conducting cylinder of finite axial length and truncated cone, and compared with the previously published results. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.     

招贴设计“硬要素”与“软要素”的解析与构建

一张优秀的招贴设计,包含了"硬要素"即具象要素与"软要素"即抽象要素之间和谐构建的关系,解析其视觉语言对于探索招贴的视觉语义具有重要意义。文章着重从以下三方面来解析招贴的视觉语言:1.招贴设计的"硬要素"解析并探索其基础性作用;2.招贴设计的"软要素"分析并研究其主观能动性拓展;3.招贴设计"硬要素"与"软要素"的和谐处理并构建其整合的视觉语义,打造"形神兼备"的优秀招贴设计作品。     

记忆与延续——浅析苏州博物馆与宁波博物馆建筑设计

博物馆建筑,是一个城市文化的象征,如何使博物馆具有文化感,体现传统的审美文化,又具有新的设计元素,引导人类审美意识,苏州博物馆与宁波博物馆做了比较好的探索。     

国画绘画元素在时装画中的创新运用

自20世纪20～30年代受西方影响最广泛的上海有了时装画的问世以来,我国时装文化也就发生了巨大的变化,直到70年代末80年代初,时装设计专业才在我国出现,时装画成为了一门专业必修课,从此改变了几十年服装裁剪书中只有款式说明图的现状,并视为服装文化的组成部分,并且越来越多样化。本文将我国传统绘画元素穿插运用于当代时装画进行自我风格的拓展,希望传统与现实能够紧密地融合起来,使时装画这门艺术繁荣兴旺。     

基于LABVIEW的数据采集与分析系统

介绍了以LabVIEW 8.5为软件开发平台,以PC机、数据采集（DAQ）卡和各种气象因素传感器为主要硬件,构建了虚拟气象仪器系统。系统对6种天气数据进行实时的采集、图形化显示,并可实现对历史天气的分析与浏览。系统易于扩展到分布式天气信息的采集与处理,试用表明该系统性能稳定,具有易开发、界面直观、易扩展等特点,适合在气象科研领域中应用。     

Space and time localization for the estimation of distributed parameters in a finite element model

In this paper we study the problem of estimating the possibly non-homogeneous material coefficients inside a physical system, from transient excitations and measurements made in a few points on the boundary. We assume there is available an adequate Finite Element (FEM) model of the system, whose distributed physical parameters must be estimated from the experimental data.We propose a space–time localization approach that gives a better conditioned estimation problem, without the need of an expensive regularization. Some experimental results obtained on an elastic system with random coefficients are given.     

一种全球尺度三维大气数据可视化系统

气象数据具有时变、多源、多维度、数据量大和多尺度等特征,常规的气象数据可视化方法难以满足气象预报与气象研究中的需求.描述了一个新的全球尺度三维大气数据可视化系统——AVIS.系统实现了面向各类密度场、向量场、张量场和非空间数据的可视化方法,设计了适用于大气数据的球面体绘制和混合绘制方法.系统还实现了一套跨平台并行可视化及分析构架,支持在浏览器中或其他显示和交互设备上使用,并利用后端计算集群加速数据的计算与绘制过程.案例分析表明,该系统可以全方位地展现气象数据中的信息,帮助用户综合多种气象信息进行分析.