Windows环境下USB应用程序实例的开发

介绍了与开发USB应用程序的有关组件，包括USB驱动程序、HID函数、API函数等，最后举了一个例子，给出了具体的开发流程图。     

突发OFDM信号调制识别

为了对OFDM信号进行识别,针对高斯性检测法无法识别白噪声和OFDM信号的问题,提出先应用多子带谱熵法进行OFDM信号端点检测,再构造KS检验统计量进行OFDM信号识别的方案。理论分析及仿真结果表明,多子带谱熵法能够有效地进行OFDM信号的端点检测,基于端点检测的KS统计量降低了纯噪声信号带来的虚警,进而提高了对OFDM信号的识别能力,可以有效地进行突发OFDM信号的识别。     

脱胶剂对大豆油脱胶效果及磷脂质量的影响

在以前试验得出的大豆油水化脱胶优化条件的基础上，对含磷脂１．９２％的大豆油水化时分别加入乙酸酐、柠檬酸、过氧化氢、磷酸、乙酸、氯化钠、氢氧化钠。结果是：加乙酸酐得到的脱胶油含磷脂量最低，为０．１５％；加过氧化氢得到的磷脂颜色最浅，为Ｇａｒｄｎｅｒ比色５￣＋，而脱胶油的过氧化值最高；加柠檬酸得到的磷脂丙酮不溶物含量最高，为８２．６％，精炼率也是高，为９７．９％；加磷酸得到的磷脂颜色最深，为Ｇａｒｄｎｅｒ比色９￣＋。     

Fitting curves and surfaces with constrained implicit polynomials

A problem which often arises while fitting implicit polynomials to 2D and 3D data sets is the following: although the data set is simple, the fit exhibits undesired phenomena, such as loops, holes, extraneous components, etc. Previous work tackled these problems by optimizing heuristic cost functions, which penalize some of these topological problems in the fit. The paper suggests a different approach-to design parameterized families of polynomials whose zero-sets are guaranteed to satisfy certain topological properties. Namely, we construct families of polynomials with star-shaped zero-sets, as well as polynomials whose zero-sets are guaranteed not to intersect an ellipse circumscribing the data or to be entirely contained in such an ellipse. This is more rigorous than using heuristics which may fail and result in pathological zero-sets. The ability to parameterize these families depends heavily on the ability to parameterize positive polynomials. To achieve this, we use some powerful results from real algebraic geometry     

Restoring subsampled color images

In some capturing devices, such as digital cameras, there is only one color sensor at each pixel. Usually, 50% of the pixels have only a green sensor, 25% only a red sensor, and 25% only a blue sensor. The problem is then to restore the two missing colors at each pixel – this is called “demosaicing”, because the original samples are usually arranged in a mosaic pattern. In this short paper, a few demosaicing algorithms are developed and compared. They all incorporate a notion of “smoothness in chroma space”, by imposing conditions not only on the behavior of each color channel separately, but also on the correlation between the three channels.     

非协作通信中的3G ALE信号识别研究

3G ALE(Third Generation HF Automatic Link Establishment)通信由于其特有的抗截获和抗干扰性,受到了各国军方的广泛关注,同时也是非协作通信中的一个重要研究课题.为达到识别3G ALE信号的目的,本文首先分析了该信号的音响、载波、持续时间和带宽等基本特性,其次从3G A...     

Positive ion spectra in He-CO-O2-laser discharges

The ion spectra of He-CO-laser discharges with and without small addition of O2is presented. It is shown that upon addition of oxygen the dominant positive charge carriers in the discharge are O2⁺ions. It is argued that the oxygen ion O2⁺is populated in stage processes: thea^{3}Pistate of CO relaxes to a metastable state of oxygen, which in turn is ionized by electrons.