Excel二次开发在模拟水氡观测中的应用

尝试对Excel工作表进行二次开发,将其应用到台站模拟水氡观测工作当中,可以自动计算出模拟水氡观测的标定、季检结果,需要作图的还可以自动作图,杜绝了人工计算产生的不必要误差,减轻了劳动强度,实现了观测资料的数字化存档,对台站模拟水氡观测日常工作具有很大帮助。经吉林省地震局多个台站使用,Excel工作表自动计算结果与人工计算结果两者完全相符,效果良好。     

No-reference stereoscopic image quality assessment using quaternion wavelet transform and heterogeneous ensemble learning

As the demand for high-quality stereo images has grown in recent years, stereoscopic image quality assessment (SIQA) has become an important research area in modern image processing technology.In this paper, we propose a no-reference stereoscopic image quality assessment (NR-SIQA) model using heterogeneous ensemble learning ‘quality-aware’ features from luminance image, chrominance image, disparity and cyclopean images via quaternion wavelet transform (QWT). Firstly, luminance image and chrominance image are generated by CIELAB color space as monocular perception, and the novel disparity and cyclopean images are utilized to complement with monocular information. Then, a number of ‘quality-aware’ features in the quaternion wavelet domain are discovered, including entropy, texture features, energy features, energy differences features and MSCN coefficients of high frequency sub-band. Finally, a heterogeneous ensemble model via support vector regression (SVR) & extreme learning machine (ELM) & random forest (RF) is proposed to predict quality score, and bootstrap sampling and rotated feature space are used to increase the diversity of data distribution. Comparing with the state-of-the-art NR-SIQA models, experimental results on four public databases prove the accuracy and robustness of the proposed model.     

Arnold置乱在零水印中的二次复用

为了提高水印的鲁棒性和减小对应版权信息的大小,本文提出了一种基于Arnold变换、DWT和SVD的零水印算法。该算法将载体图像进行DWT变换,对低频子带进行分块SVD;比较置乱后的最大奇异值的大小,若大于则对应位为1,否则为0;将结果与预处理过的水印做异或运算,得密钥矩阵。该矩阵为检测水印提供密钥。实验证明,本算法对图像压缩、滤波、模糊、噪声及脏图具有良好的鲁棒性。     

FD—140型高灵敏测氡仪及其应用

FD—140型高灵敏测氡仪用于测量氡的浓度,测氡灵敏度可达15mBq/m~3 min。该仪器可用于普查与勘探铀矿床,也可用于找石油、煤、金、地下水和地震预报以及地质构造调查等方面。     

基于小波变换的语音同步方法研究

为提高语音通信干扰效果客观评估中标准语音文件和受扰语音文件的同步精度,对军标GJB4405A-2006中规定的标准语音文件增设了高低频交叉的双音频同步头;介绍了小波消噪的原理,利用2层sym小波对受扰语音文件进行了消噪处理,将同步头中的高频信号作为噪声进行大幅削弱;设计了基于幅度比较的同步算法,找出同步基准点,并对20组受扰严重的语音文件的进行了仿真测试,仿真结果证明了该方法得到的同步精度符合后续数据处理的要求。     

电火花线切割加工中实体数据格式的程序转换

针对电火花线切割编程系统绘制、编辑复杂曲线图形、文字功能差以及数据文件兼容功能不强的弱点，本文提出一种综合解决方案。利用AutoCAD强大的图形能力，基于对其图形实体数据表的分析，对AutoLISP程序提取实体数据，并自动转换成线切割自动编程系统所需的数据文件。该方法可使电火花线切割系统完成复杂图形、字体及具有尖角造型实体的加工，实践证明有较大的实用意义。     

Modeling guided wave propagation with application to the long-range defect detection in railroad tracks

The aim of this work is to demonstrate the use of a commercial finite element package, ABAQUS EXPLICIT, to model ultrasonic guided waves in structural components. The particular application of interest is modeling the interaction of a broadband vertical bending mode with transverse-type defects in railroad tracks. This topic is part of a broader project on high-speed defect detection in rails by long-range ultrasonic inspections. Reflection coefficient spectra in the 20–45 kHz range are obtained for four different sizes and three different orientations of transverse head flaws. A preliminary study of Lamb waves in a free plate helps drawing modeling guidelines for the rail.     

面向对象轮廓约束GGVF Snake的建筑物边界优化方法

分析高分辨率遥感影像中建筑物的特征和常用方法提取建筑物存在边界漏检误检导致的边界不规则等问题,提出面向对象轮廓约束广义梯度矢量流（GGVF）Snake模型的建筑物边界优化方法. 在利用分类法获取建筑物轮廓的初始结果基础上,自动提取每个建筑物轮廓线作为GGVF Snake的初始轮廓线,获取各轮廓外接矩形进行对象裁剪,提取每个建筑物的子图对象. 对每个子图对象进行Canny边缘检测,结合Hough变换提取直线特征,输入到广义梯度矢量流模型的迭代求解中快速最小化能量函数,实现对象级建筑物轮廓的精确优化. 实验结果表明,利用提出的方法能够自动获取初始建筑物的轮廓信息,提高优化的自动化程度;基于对象级的边缘检测与直线特征的加入,有助于GGVF Snake快速拟合,准确地平滑建筑物边缘且准确度高. 相对于其他对比方法,本文方法的轮廓优化总体精度和综合值均有提升,可以作为有效提升分类原理获取的建筑物轮廓的优化后处理手段,提高了建筑物提取的精度.     

一种基于小波变换的非均匀量化索引调制水印算法

为了提高数字水印的稳健性与不可见性,将图像小波变换与量化索引调制算法相结合,提出了一种基于小波变换的非均匀量化索引调制数字水印算法。该算法对原始图像进行离散小波变换,将中频小波系数分成3×3的系数子块作为水印载体,对子块的系数均值采用非均匀量化索引调制,实现二值水印的嵌入。根据人类视觉特性,不同的系数子块采用不同的量化间隔并自适应于子块内相邻系数的差值。实验结果表明,该算法透明性好,安全性高,对高斯白噪声、剪切、滤波以及JPEG压缩等常见攻击具有较强的稳健性。     

Biowaste-derived hydroxyapatite reinforced with polyvinyl pyrrolidone/aloevera composite for biomedical applications

The present investigation focuses on the synthesis of crabshell-derived hydroxyapatite (CS-HAP)/ water-soluble synthetic polymer—polyvinylpyrrolidone(PVP)/aloevera(AV)—a natural biopolymer, as a composite for enhanced mechanical, antibacterial and biocompatible properties. The reinforcement of polymer has a significant function in increasing the mechanical property of the composite, whereas the incorporation of AV improves the antibacterial and biocompatibility. Phase composition, morphology, mechanical property, and hydrophilicity of CS-HAP/PVP/AV biocomposite with different concentrations of PVP and AV were examined by Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray (SEM-EDX), Vickers microhardness tests, contact angle, respectively. Furthermore, the antibacterial efficiency of the composite is assessed using Escherichia coli (E coli) and Staphylococcus aureus (S aureus). The biocompatibility of HOS MG 63 cells on the CS-HAP/PVP/AV composite is evaluated by MTT assay test. The obtained results evidence that the as-synthesized composite have appropriate mechanical, antibacterial and biocompatible properties. Overall, the combination of mechanical property of PVP, antibacterial and biocompatible property of AV in CS-HAP/PVP/AV, makes the composite a potential therapeutic material for various biomedical applications.