基于校园门户网站新闻通知推送服务的研究

针对校园门户网站新闻通知不到位,存在缺陷,利用率低,服务效率低的现状,研究未来可以提升的优势以及展望未来发展方向。并着重考虑了在非网络环境下,以简单快速为目的把校园新闻,校园公告传送给每位老师的设计思路。为校园门户网站运行提高效率的部分技术提出一种可行务实的解决方案。     

Existence and uniqueness of strictly nondecreasing and positive solution for a fractional three-point boundary value problem

In this paper, we consider the following nonlinear fractional three-point boundary value problem

     

一种自适应红外图像边缘增强算法

针对红外图像边缘模糊和非均匀性噪声强的特点,提出了一种基于加权的自适应红外图像边缘增强方法。该方法不仅增强红外图像边缘,而且改善了传统边缘增强算法对图像噪声放大的缺点,避免了对强边缘的过渡增强导致图像出现过增强现象,改善了图像质量。实验结果表明,该方法具有良好的前景和实用价值。     

A 3D GIS spatial data model based on conformal geometric algebra

We propose a new Geographic Information System (GIS) three-dimensional (3D) data model based on conformal geometric algebra (CGA). In this approach, geographic objects of different dimensions are mapped to the corresponding basic elements (blades) in Clifford algebra, and the expressions of multi-dimensional objects are unified without losing their geometric meaning. Geometric and topologic computations are also processed in a clear and coordinates-free way. Under the CGA framework, basic geometrics are con...     

一种基于单片机的多功能防醉驾系统装置设计

采用ATmega16单片机作为核心控制器件,通过检测驾驶员的酒精含量是否超标来控制汽车的点火开关是否打开来杜绝酒后驾车;声光报警电路模块用于当其酒精含量超标时发出声光报警;同时,当系统测知饮酒驾驶员醉酒后,GPS定位系统及语音呼叫系统会以短信的方式通知车辆的位置,方便及时处理,降低了交通事故的发生率;设置的LCD显示控件进行所有信息的实时显示。     

Deterministic Sensing Matrices Based on Multidimensional Pseudo-Random Sequences

An approach is proposed for producing compressed sensing (CS) matrices via multidimensional pseudo-random sequences. The columns of these matrices are binary Gold code vectors where zeros are replaced by ?1. This technique is mainly applied to restore sub-Nyquist-sampled sparse signals, especially image reconstruction using block CS. First, for the specific requirements of message length and compression ratio, a set Λ which includes all preferred pairs of m-sequences is obtained by a searching algorithm. Then a sensing matrix A _M×N is produced by using structured hardware circuits. In order to better characterize the correlation between any two columns of A, the average coherence is defined and the restricted isometry property (RIP) condition is described accordingly. This RIP condition has strong adaptability to different sparse signals. The experimental results show that with constant values of N and M, the sparsity bound of A is higher than that of a random matrix. Also, the recovery probability may have a maximum increase of 20 % in a noisy environment.     

UMTS与LTE FDD系统铁塔共建共享干扰分析

电信基础设施共建共享是建设资源节约型、环境友好型社会的必然要求,也是企业实现自身科学发展的必然途径。在移动通信系统的共建共享中,基站建设是其重要内容之一,而天线隔离度则是其实现共建共享的关键参量。从非共站共存和共站共存两种情况对UMTS系统与LTE FDD系统并存时的天线隔离度进行了计算,该计算规避了杂散干扰和阻塞干扰,最后还给出了两系统共存时对天线的间隔要求。     

一种基于随机文件的C#与非托管C代码交互模式

在大型科学计算过程中往往会出现海量中间数据,需要在不同开发平台或语言之间传递,此时中间数据会消耗大量系统资源,引起系统性能急剧下降;此外,中间数据长度的不确定性和跨平台的移植性都对科学计算算法提出了较高的接口要求;为保证系统的稳定性和可移植性,文中提出一种基于随机文件读写进行数据传递的简单实用方法,来实现在C#．NET平台下的托管代码中调用C语言开发的非托管代码的交互模式。     

基于图像的浮雕雕刻自动编程软件的开发

为了实现浮雕的数控加工,提出了基于图像的浮雕雕刻方法。该软件采用数字图像处理技术,结合丰富的加工参数选项,实现了浮雕雕刻的自动编程。经测试其生成的数控加工程序在数控机床上能够加工出令人满意的浮雕作品,同时配合仿真软件的使用,可迅速获得浮雕的加工效果和加工时间,有助于产品的生产与加工安排。     

MIMO检测技术在LTE系统中的应用研究

随着移动通信的发展,新一代移动通信标准LTE对传输速率和系统容量等提出了更高的要求,这就需要采用更先进的技术来实现更高的传输速率和更好的传输质量。多输入多输出（MIMO,MultipleInputMultipleOutput）技术就是实现高速传输,提高传输质量的重要途径。本文对MIM0检测技术在LTE系统中的应用进行了分析与研究。