SIFT算法的介绍和应用

SIFT算法是众多图像匹配算法中被广泛应用的一种,其具有良好的尺度、光照和空间旋转不变等特征。文章介绍了SIFT算法的4个主要步骤,并将该算法应用到多色二值压缩算法中,提高了压缩效率,缩小了压缩后的存储空间。     

房屋建筑面积测算若干问题探讨

在深入学习领会国家标准《房产测量规范》内容及条文含义的基础上,文章对房屋建筑面积测算若干问题进行了探讨,重点探讨房屋建筑面积范围的计算及房屋产权面积测算。     

无拍频控制技术在新一代CRH380CL型高速动车组上的应用

高速动车组技术的迅猛发展对牵引变流器的性能提出了更高的要求。在动车组传动系统中,单相脉冲整流器工作时,会在中间直流环节产生2倍于电网频率的脉动分量,该脉动分量传递到逆变器输出侧会在电机上产生拍频现象,引起转矩脉动和电机过热。     

中国股市财富效应静态和动态实证分析

本文利用2002—2008年的月度数据,利用协整分析、误差修正模型等现代计量经济方法和状态空间模型研究了中国股市财富效应问题。研究结果认为:从长期均衡关系看,我国股市财富效应是显著存在;从短期动态关系看,我国股市财富波动对全社会消费支出波动具有负影响但不显著;从股市财富的边际消费倾向的动态过程看,我国股市财富效应始终存在,但挤出效应同样显著。     

基于创新空间的移动商务经营模式策略研究

经营模式创新首先要解决的是方向性问题,这是保证企业新经营模式实施成功的重要保障。本文从技术、组织和市场三个维度构建了移动商务经营模式的创新空间和评价指标体系,在此基础之上提出了移动商务经营模式创新策略选择的系统框架。将移动商务经营模式创新策略划分为三种情况:连续性创新与不连续性创新策略、延续性创新与破坏性创新策略、现有模式和新商业模式策略,并以移动价值链的核心成员为例,分析了各成员可采取的各种经营策略,意在为企业移动商务经营模式策略的选择提供依据。     

浅析中国传统建筑的空间与造型

中国人自古以来过着修身养性的生活,人们依赖自然,亲和自然。中国传统建筑主张"天人合一"。基于与自然高度协同的中国文化精神,热爱自然、尊重自然,镶嵌在自然中,仿佛是大自然的一个有机组成。这不仅在中国各建筑类型中有明显的反映,在与自然高度协同的观念在园林中更有突出的表现。这种朴素的哲学思想影响着中国古典建筑室内外空间塑造。本文仅从古建筑的空间处理和建筑的造型两个方面分析一下中国传统建筑的可持续发展性。     

基于空间受限条件下城际轨道交通梁场规划方案优化研究

结合穗莞深城际轨道交通洪梅梁场建设的实践经验,详细介绍了在沿线路方向场地空间极为有限、不符合常规布置方案的条件下,采用单、双线和25m、30m均可共用的制、存梁台座等方法对梁场规划布置方案进行比选和优化进而制定出适合该梁场实际情况的规划方案,并通过实际生产验证其可行性,对同类条件下城际轨道交通及铁路客运专线制梁场的规划方案的设计具有指导意义。     

Opinion convergence in location: A spatial version of the Delphi method

This paper proposes a modified version of the Delphi method, starting from the assumption that in many situations the convergence of opinions can be considered in a spatial context. The Spatial Delphi we suggest is based, like the classical Delphi, on the judgments of experts, and it is useful in the consultations for decision and/or forecast purposes, provided that they concern matters of spatial location. The basis for the questionnaire is a map, on which each expert provides, as answer(s), one or more opinion-points, i.e., locations that, according to their opinion, are best for a specific purpose. We propose a method for narrowing the area of convergence along a multi-step procedure so that the final result of the consultation is a small portion of the initial territory with respect to the initial area considered. Besides a simulation study, we report also a prototype application with a panel of twelve experts.     

An empirical investigation into the gravitation and convergence of industry return rates in OECD countries

Tests are offered for the hypotheses that sectoral average profit rates and incremental return rates are gravitating around or converging towards a common value. We study data for various OECD countries relying on an econometric method able to account for residual autocorrelation and cross‐sector correlation. Our null hypotheses receive only a mixed empirical support. This is interpreted as the result of various kinds of limitations to capital mobility. Policy implications are discussed.     

Optimal detection strategies for an established invasive pest

We model optimal detection of sub-populations of invasive species that establish ahead of an advancing front. For many invaders, eradication of the main population is an untenable goal, yet it may be possible to treat and eradicate emerging sub-populations once these sub-populations are detected. We embed a dynamically optimal post-detection management plan of sub-populations into a model of optimal detection effort determination and find that optimal detection effort depends, in part, on the distance from the main front: locations closer to the front with shorter management horizons enjoy lower reductions in overall cost from intervention. The uninfested landscape is divided into two zones, characterized by different dynamically optimal management plans: a suppression zone and an eradication zone. In the suppression zone, optimal detection effort increases with distance from the front. At the distance where the suppression zone yields to the eradication zone, optimal detection effort plateaus at its maximum level.