Factors associated with the likelihood of injury resulting from collisions between four-wheel drive vehicles and passenger cars

The specific effects of vehicular type on the likelihood of an injury occurring are relatively unexplored. This study sought to assess the relative risk of injury to occupants of four-wheel drive vehicles and their counterparts in passenger cars.Data for 1143 occupants from all of the 454 crashes in Oklahoma, in 1995 that involved a four-wheel drive vehicle were used. Multiple logistic regression analysis determined the association between potential predictive factors and vehicular injury. Odds ratios revealed occupancy in a passenger car to be a major predictor of the likelihood of injury. Other factors include the driver being female, driving too fast, travel on curved or level roadways, and being hit laterally or from the rear.     

论中西广告文化语境的类特质现象

随着世界经济的发展,经济、科学技术国际交流的增多,世界正向“地球村”的方向发展,在文化转型当下的广告研究中注意到中西文化语境的不同“类特质”的差别现象显得十分重要。本文从思维方式、价值观、语言文字的形态等几个方面对此进行了详细的探讨性论述。     

FAT和NTFS文件系统的特点与应用

对Windows 98操作系统可以同时支持FATl6、FAT32两种文件系统和Windows 2000/XP操作系统则支持FATl6、FAT32、NTFS三种文件系统进行了研究,探讨了几个问题1.什么是文件系统;2.基本文件系统(FAT16);3.NTFS文件系统;4.增强的文件系统(FAT32);5.DOS下访问NTFS分区的数据方法。     

在Power Builder中利用BLOB数据类型实现Word文档的处理

在应用程序开发中多数时候只处理常规数据,在实际应用中为了实现系统的要求,开发者往往需要根据不同情况实现大数据的处理.本文阐述了在使用PowerBuilder开发应用程序中,如何利用OLE来实现word文档的处理,从而增强PowerBuilder开发过程中大数据类型的处理.     

负反馈放大器反馈类型及其判断

电子电路中,负反馈现象普遍存在,负反馈是模拟电子技术中的一个重要知识点,也是难以掌握的知识点.对反馈概念、反馈极性、反馈类型进行了讨论,归纳了反馈极性与反馈类型在分立元件电路和集成电路中的判断方法.     

Volume Preservation of Multiresolution Meshes

Geometric constraints have proved to be efficient for enhancing the realism of shape animation. The present paper addresses the computation and the preservation of the volume enclosed by multiresolution meshes. A wavelet based representation allows the mesh to be handled at any level of resolution. The key contribution is the calculation of the volume as a trilinear form with respect to the multiresolution coefficients. Efficiency is reached thanks to the pre-processing of a sparse 3D data structure involving the transposition of the filters while represented as a lifting scheme. A versatile and interactive method for preserving the volume during a deformation process is then proposed. It is based on a quadratic minimization subject to a linearization of the volume constraint. A closed form of the solution is derived.     

基于集合论的煤矿床空间数据模型研究

为了有效地表达现实世界特别是煤矿床的三维空间实体，在分析了复杂煤层三维数据的基础上，基于集合论的数学思想，提出了一种新的抽象的煤矿床空间数据模型．该模型把三维空间数据分解为三维点、线、简单面、面、体等5种空间数据模型，通过模型的相关性进行适当的集合运算，从而得出空间真三维煤矿床实体．并以断层为实例，给出了相应模型表示及其相应的集合运算，即集合间并、交、差等相关操作，从而生成三维煤矿床断层．结果表明：这种模型可以较为有效地表达煤矿床三维空间实体，为进一步研究奠定了基础．     

具有两类修复设备可修系统解的存在唯一性

讨论一个系统故障的修复时间是任意分布的可修系统的数学模型.把用积分-微分方程描述的系统模型转换为积分方程形式,并运用Banach空间下的算子理论,得到了此系统非负解的存在唯一性.