基于BP网络的降雨-水位预报模型应用研究

本文改进了BP网络的学习率和动量项的自适应调整算法,阐述了洪水预报BP网络模型的构造和数据处理方法,建立了降雨～水位预报BP网络模型,实现了洪水水位的直接预报,同时还提出了以点雨量作为模型输入的建模方案,有效地改善了BP网络的模拟性能。     

Automatic registration of large range datasets with spin-images

Terrestrial laser scanning technique has represented one of the more advances occurred in the last years in the field of data acquisition. Time-of-Flight (TOF) systems provide a fast and reliable tool to measure millions of 3D points allowing a very effective and dense measurement of the surface geometry. Nowadays, the generation of high quality 3D models is a practice applied to different kind of objects: small or medium size artworks, parts of human body, cars, buildings, civil infrastructures (like dams, bridges, plants, etc.) and whole archaeological sites as well. In most cases, in order to capture the whole object geometry a number of single scans need to be acquired from different positions and then stitched together (i.e. registered each other) to generate the full 3D model. The automatization of the registration of multiple scans acquired from a terrestrial laser scanner (TLS) still represents a very attractive research field. The chance to automatically align several point clouds would reduce processing costs in terms of time and human resources. In addition it would allow even non-specialist users to produce 3D models with good quality. This paper contributes to this research area by presenting a method for the automatic registration of very dense point clouds acquired by TLS systems. The proposed solution is an extension to large datasets of an automatic range data registration procedure we developed a few years ago for the modelling of point clouds acquired with close-range laser scanners. Such procedure, based on the spin-images (SIs) algorithm, has been then improved with the introduction of a multi-resolution method that generates a pyramid of spin-images in order to speed up the matching between adjacent scans. The results we present show that this method can be successfully applied for the automatic registration of high density laser scans of complex and large structures of Cultural Heritage.     

老尽少年心——读白先勇小说《谪仙记》

白先勇在《谪仙记》中让读者感受到海外游子的生存境遇,品味出他们内心的痛楚,并引发对于乡愁的深思。李彤的身上有着作家白先勇的影子,李彤那压抑在心底不予道出的痛苦,正是白先勇彼时心境的流露。     

巧用"税收临界点"进行纳税筹划

在经营中碰到税收临界点时，纳税人可以利用税收临界点的规定，通过增减收入或支出，来避免承担较重的税负。我们应该充分重视税收临界点在纳税筹划中的运用。鉴于此，笔者对在消费税、企业所得税、个人所得税、混合销售行为、税收起征点等方面如何运用税收临界点进行纳税筹划进行了论述与剖析，期望能够给企业提供参考价值。     

美国西点军校发展大学体育运动的经验

本文总结提出了美国西点军校发展大学体育运动的十点经验:有开创潮流的体育运动先锋,有富于远见卓识的"体育校长",确立体育工作在育人中的牢固地位,招生偏爱体育特长,拥有一流教练队伍和体育设施,重视作为大学体育龙头的校际比赛,重点发展体现团队精神的团体项目,实施全过程体能迭标考核和综合素质测评,营造人人争当运动健将的大学体育文化,坚持体育课程雷打不动.希望它们能够对发展中国大学体育运动、推进全民健身发挥借鉴作用.     

偏序集中的两个不动点定理

本文证明了偏序集中的两个不动点定理,它们分别是Tarski-Kantorovi tch不动点定理的推广与加强。     

带指定微商值特殊形式的插值

文章给出了节点处函数值与微商值个数不相等的特殊形式的插值的不同计算方法 ,特别是解决了找基函数的难题     

“拐点论”引发的低收入家庭住房的思考

我国房地产价格自2003年开始升温以来,中国房地产市场已经持续增长了近四年,直到2007年也是中国楼市历史上最疯狂的一年。2008年房价出现了曰落的现象但是房价依然较高,使得城镇中低收入者的住房成为政府迫切解决的问题之一。从中国的房价现状入手分析我国房价高的影响因素,进而提出了解决中低收入者住房的一些措施。     

对C语言中"无定义"代码的剖析

在C语言中,具有“副作用”的“无定义”代码会带来难以预料的后果,是编程人员必须避免的。但在许多C语言教材中,却存在把“无定义”代码当作正确例题讲解的问题,容易使学习者陷入C语言学习的“陷阱”。本文从实例入手,分析C语言中“无定义”代码存在的问题,并就如何避免该问题提出解决方法。     

Prozess-Familien-Punkte

Zusammenfassung Software-Entwicklung auf Grundlage von Software-System-Familien ist durch eine organisierte Wiederverwendung und Variabilit?t auf Basis einer gemeinsamen Plattform gekennzeichnet. Zus?tzliche Effizienzsteigerungen werden bei Software-System-Familien in prozessgetriebenen Anwendungsdom?nen durch die explizite Berücksichtigung von softwareinternen Prozessabl?ufen erm?glicht. Ausgehend von diesem Potenzial skizziert der vorliegende Beitrag eine Methodik zur Umfangsmessung und Aufwandsprognose für Prozess-Familien. Die hierbei beschriebenen Softwaremetriken wurden in empirischen Fallstudien validiert und erm?glichen eine Bewertung der Effizienzvorteile dieses neuen Entwicklungsansatzes.

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Software system families are characterized through a structured reuse of components and a high degree of automation based on a common infrastructure. It is possible to increase the efficiency of software system families by an explicit consideration of process flows in application domains which are driven by processes. Based on that fact this article briefly describes the approach of process family engineering. Afterwards the metrics of Process-Family-Points are explained in detail. These are the only framework to measure the size and estimate the effort of process families. Subsequently this paper shows the first results from a validation of the Process-Family-Points in the application domains of Electronic Business and Automotive.