Ad Hoc下基于IP组播的屏幕共享机制

提出了一种基于IP组播的通信机制,根据网络广播通信的特点,利用组播减少屏幕共享所需带宽,针对组播的不可靠传输和屏幕数据的特点,给出一套有限质量保证协议.一方面将传输区域细分成小矩形后对各自数据独立压缩和传输以尽量减少丢包的影响;另一方面通过融合丢失、更新区域,并作为新传输数据来调整数据的生存期,避免冗余重传.实验表明这种传输机制能明显地节省网络带宽,提供较好的显示效果.     

遥控维护条件下管道夹取技术研究

遥控维护是核装置维护中不可缺少的重要手段。核装置中的冷却管道在更换时,通过剪切工具将废旧管道剪断并脱落,最后由遥控维护夹具取出并封装。管道夹取技术是遥控维护中十分重要的一环,直接影响整个遥控维护没有成功与否。文章通过试验结果得出对管道夹取技术的结论,为遥控维护技术和辅助工装开发奠定基础。     

Basin Geomorphology and Drainage Morphometry Parame-ters Used as Indicators for Groundwater Prospect：Insight from Geographical Information System (GIS) Technique

Influence of structural and lithological controls of various drainage patterns and their stream orientations (for 2nd, 3rd and 4th order steams) were identified to evaluate the direction and controllin...     

Cloud removal of remote sensing image based on multi-output support vector regression

Removal of cloud cover on the satellite remote sensing image can effectively improve the availability of remote sensing images. For thin cloud cover, support vector value contourlet transform is used to achieve multi-scale decomposition of the area of thin cloud cover on remote sensing images. Through enhancing coefficients of high frequency and suppressing coefficients of low frequency, the thin cloud is removed. For thick cloud cover, if the areas of thick cloud cover on multi-source or multi-temporal remote sensing images do not overlap, the multi-output support vector regression learning method is used to remove this kind of thick clouds. If the thick cloud cover areas overlap, by using the multi-output learning of the surrounding areas to predict the surface features of the overlapped thick cloud cover areas, this kind of thick cloud is removed. Experimental results show that the proposed cloud removal method can effectively solve the problems of the cloud overlapping and radiation difference among multi-source images. The cloud removal image is clear and smooth.     

SUN工作站中远程过程调用的实现

根据ＯＳＩ体系结构，分析了远程过程调用的工作原理及实现机制．给出了远程过程调用的程序设计方法．     

遥感数字图象处理方法及应用效果的研究

本文介绍了结合铁路新线勘测、旧线改建,以南方山区大瑶山长隧道、北方平原区新(乡)荷(泽)线黄河桥位、西北青藏线唐古拉高原冻土、青(海)新(疆)线盐渍土分布区等作为实验点段,用美国陆地卫星MSS的CCT磁带,在IPOS—101数字图象处理系统上进行的遥感数字图象处理的方法及应用效果。数字图象处理能够把遥感获得的庞大繁杂的电磁波信息,进行快速严密的数字处理,能够使被干扰和歪曲的图象得到恢复。通过各种增强处理,可使模糊的图象变得清晰,使色调单一的黑白图象变为鲜艳夺目的彩色图象,可以压缩和减弱那些不利于判释的干扰信息,突出强调波谱信息和判释目标。在某种情况下,经过图象分类处理,还能迅速准确的进行自动识别,获得各种专业图件和统计数据。实验结果表明,结合铁路工程地质勘测应用,数字图象处理在目前阶段宜以图象增强为主。     

突泉县造林立地类型的研究

本文主要应用TM卫片2，3，4波段假彩色合成1：20万影像图的MSS1：50万卫片，以及地形图和现有资料，解译划分了突泉县的造林立地类型，并在分析立地类型的基础上，对突泉县的景观生态建设提出了初步的建议。     

计算机局部网络协议的研究与应用

计算机局部网络协议的研究是国内外计算机领域中甚为关注的课题之一.本文分析了远程计算机网络协议,尤其是ISO OSI/RM模型中有关约会层、表示层、应用层协议;研究和设计了同机种局部网络的约会层、应用层有关协议,并在具体局部网络上加以实现.目前,按协议设计的有关局部网络应用软件已在本校网络与OA实验室里应用.     

Bi-Spectrum Scattering Model for Dielectric Randomly Rough Surface

The bistatic scattering model is often used for remote microwave sensing. The bi-spectrum model (BSM) for conducting surfaces was used to develop a scattering model for dielectric randomly rough surfaces to estimate their bistatic scattering coefficients. The model for dielectric rough surfaces differs from the BSM for a conducting surface by including Fresnell reflection and transmission from dielectric rough surfaces. The bistatic scattering coefficients were defined to satisfy the reciprocal theorem. Values calculated using the BSM for dielectric randomly rough surfaces compare well with those of the integral equation model (IEM) and with experimental data, showing that the BSM accuracy is acceptable and its range of validity is similar to that of IEM while the BSM expression is simpler than that of IEM。