二维卡尔曼─中值混合自适应滤波

本文提出了能同时抑制加性噪声，脉冲噪声干扰和点扩展函数模糊，又能保护图象边缘及细节信息的新型滤波方法—“二维Kalman－Median混合自适应滤波”，并成功地应用于统计图象恢复，取得了满意的效果。     

自动化翻拍图像空间失真复原研究

在自动化翻拍的图像采集过程中,图像中各像素间的空间相互关系会随着采集发生变化,通过对空间失真复原算法的深入研究,利用几何极坐标、中值滤波等方法,提出自动化翻拍图像复原算法。实验结果表明,使用该算法能够消除由图像采集引起的空间畸变失真,提高图像的可识别性,是一种有效的方法。     

UWSNs中基于AUV移动的覆盖盲区修复算法

提出了一种水下无线传感器网络(UWSNs)中基于自主水下航行器(AUV)移动的覆盖算法。首先将要覆盖的区域网格化,然后以适当的策略遍历各个小格,从而实现盲区的覆盖修复。该算法克服了水下环境复杂未知、覆盖场景多样化而难以可靠覆盖的问题,同时使得AUV路径移动消耗最小化。文中还对3D场景和多AUVs协同等情况进行了分析和探讨。仿真实验表明,该算法在覆盖盲区规则、不规则或不连续等场景下均有较好的表现。     

MAXDOS在机房维护中的应用

高校机房计算机由于其使用的频繁以及学生的误操作,经常造成系统故障。该文主要介绍了利用MaxDos软件对机房计算机系统方便有效的维护—网络克隆。     

黑客入侵技术的分析和检测

黑客入侵对互联网的安全构成了严重的威胁,而黑客不断变异的入侵技术手段和方法.本文通过分析黑客入侵技术和入侵方式的变异,修改入侵检测模型的规则集,通过入侵检测发现和察觉入侵和入侵企图,对检测到的攻击通过备份方式来恢复数据.     

用于彩色图像复原的带有高阶耦合项的TV模型

提出了一种改进的TV(Total Variance)彩色图像复原方法。为消除TV模型的各向异性扩散导致的块效应,采用在TV模型的基础上耦合高阶项的新模型;并将这个新的模型推广到彩色图像,利用多通道的耦合机制实现各单色通道图像复原过程的相互制约。新模型保持了各向异性扩散的特性,图像的边缘得到了保持。实验结果证明, 与其它模型的复原 彩色图像相比,新模型复原的图像的峰值信噪比(PSNR)有了更大的提高,图像的非边缘区看上去更加平滑自然。     

基于马尔可夫随机场的图像恢复方法

根据噪声的先验特点,建立了基于Ｍａｒｋｏｖ随机场的退化图像恢复模型,从而将图像的恢复问题转化为求解最大后验概率（ＭＡＰ）问题。该文以模拟退火算法的思想为基础,通过引入随机判据的方法代替退火过程来进行ＭＡＰ的估计,实验结果证明了这种方法的有效性。     

用于图像恢复的基于SVR的自适应新滤波器的研究*

提出了一种用SVR回归器识别脉冲噪声的思想,并将其应用于图像滤波和恢复,形成了用于对脉冲噪声进行滤波的SVR自适应滤波器。这种滤波器在滤波时,先用SVR对待识别像素作噪声识别,再对含噪声的像素作中值滤波。用SVR作噪声识别时,先对滤波窗口作SVR回归,通过待识别像素回归距的大小判断其是否含有噪声。在进行SVR回归时,使用鲁棒的Huber损失函数。由于更充分地利用了待识别像素点的局部背景信息,这种滤波器提高了脉冲噪声识别的正确率。实验表明,在保留原图像的细节信息方面,其滤波效果要优于基于SVC的中值滤波器。     

Determinants of temperature in small coastal embayments of Lake Ontario

Along 25 km of the Lake Ontario shoreline near Toronto, Ontario, small coastal embayments (0.4–32 ha) have been constructed or modified by lake-infilling to restore warmwater fish habitat. The variation in thermal habitat quality for warmwater fishes among these embayments is very high; temperatures range from those found within a small pond to those of much cooler Lake Ontario. Since meteorological conditions and surface heat fluxes are almost identical, the temperature variation among embayments must be caused by differences in bathymetry or exchange with Lake Ontario. However, a previous study on these embayments found paradoxically that temperatures were not strongly associated with channel size or embayment bathymetry. This paper resolves the paradox by showing that flushing times for almost all of the constructed embayments were less than 1 day, and often less than 12 h. With so little time to warm within the embayments, water temperatures of almost all embayments remained very close to the temperatures of the adjacent lake waters. The coldest embayments connected directly to open Lake Ontario and warmer embayments connected to Lake Ontario through other embayments or protected harbors, where the inflowing water from Lake Ontario had already substantially warmed. To allow embayments along the exposed shoreline of Toronto to reach acceptable temperatures for warmwater fish, we use heat budgets to calculate that average summer flushing times must be increased from their current length of 1.5 to 5.5 h to approximately 30 h. Such changes could be achieved through large reductions in the channel cross section.     

Preliminary Assessment and Rating of Stream Channel Stability near Bridges

The primary cause of bridge failure in the United States is scour and channel instability around the bridge foundations. The ability to assess channel stability in the vicinity of bridges is needed to alert engineers to possible unstable conditions at the bridge foundations, to design stable road crossings, and to mitigate against erosion at those structures. This information is valuable for stream stabilization projects as well, particularly for cases where the reach to be restored includes a bridge. However, a systematic methodology for rapidly assessing channel stability that is applicable at bridges located in the various regions of the country does not currently exist. In this study, an assessment method for the preliminary documentation and rating of channel stability near bridges was developed, based on prior stability assessment methods as well as observations at bridges in 13 physiographic regions of the continental United States. This method provides an assessment of channel stability conditions as they affect bridge foundations. It is intended for a quick assessment of conditions for the purpose of documenting conditions at bridges and for judging whether more extensive geomorphic studies or complete hydraulic and sediment transport analyses are needed to assess the potential for adverse conditions developing at a particular bridge in the future.