关于体育教学改革的问题探讨

分析体育课教学中的主要任务、教材内容、教学方法、成绩考核等几个问题,并对此进行初步的研究和探讨,提出改革意见和措施,以改善体育课的教学效果。     

Preparation and characterization of linear low‐density polyethylene/low‐density polyethylene/TiO2 membranes

Because of their special functions, the application of nanoscale powders has recently attracted both industrial and theoretical interest. In this study, nanoscale TiO₂, which exhibited a special UV absorption and consequent antibacterial function, was added to a low‐density polyethylene/linear low‐density polyethylene hybrid by melt compounding to yield functional composite membranes. TiO₂ exhibited an apparent induced nucleation effect on the crystallization of polyethylene, and the size of the crystallites decreased while the number increaed with the introduction of TiO₂; however, the crystallinity of polyethylene changed little. Also, TiO₂ exhibited an ideal dispersion in the membrane with an average size less than 100 nm, and this excellent dispersion provided the membranes extra UV absorption; moreover, the transparency of the membranes was maintained to satisfy common requirements. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 216–221, 2005     

Reference Monitor Technology: Watching Your Every Keystroke

ABSTRACT

In modern electronic communication, ensuring security during transferring of data is crucial. Digital steganography is the technique that ensures the same, in which any secret data is hidden into the cover mediums such as images, audio or video files. Resistance to removal and invisibility of hidden data are the two important requirements of any steganographic system. This paper proposes a new approach to hide any secret data in images. Also, this paper proposes a new approach which hides an executable file in images. The executable files we have considered are Windows PE (Portable-Executable) files. Moreover from the experimental results, it is proven that the proposed approach is suitable for hiding all type of digital files including exe files. Also, comparing with the existing approaches, this approach shows better performance.     

基于可疑行为识别的PE病毒检测方法

针对当前PE病毒难以防范及查杀的现象,对PE病毒关键技术进行分析,提取病毒典型特征的可疑行为,在此基础上提出一种Windows平台下的静态检测方法。该方法在对程序反编译处理的基础上,以指令序列与控制流图的分析为行为识别依据,完成基于可疑行为识别的病毒检测方法的设计。实验结果证明,该检测方法能有效检测混淆变换病毒。     

基于PE文件资源数据的信息隐藏方案

研究PE图标和位图资源存储格式及其特点,提出基于PE资源数据的信息隐藏方案。该方案利用PE文件的隐蔽性,采用有效的信息隐藏算法将秘密信息嵌入到PE资源数据中,提高信息隐藏的安全性和隐藏容量。针对PE图标和位图特点,提出一种新的调色板冗余颜色分配算法,提高基于调色板颜色冗余隐藏算法的嵌入量。     

Detection of epileptic electroencephalogram based on Permutation Entropy and Support Vector Machines

The electroencephalogram (EEG) has proven a valuable tool in the study and detection of epilepsy. This paper investigates for the first time the use of Permutation Entropy (PE) as a feature for automated epileptic seizure detection. A Support Vector Machine (SVM) is used to classify segments of normal and epileptic EEG based on PE values. The proposed system utilizes the fact that the EEG during epileptic seizures is characterized by lower PE than normal EEG. It is shown that average sensitivity of 94.38% and average specificity of 93.23% is obtained by using PE as a feature to characterize epileptic and seizure-free EEG, while 100% sensitivity and specificity were also obtained in single-trial classifications.     

造粒机模板与切粒刀对聚乙烯颗粒质量的影响

通过多年来对聚乙烯造粒系统的调查研究及现场实践，确认了聚乙烯产品质量的影响因素。选择了造粒模板与切粒刀之间的最佳匹配。     

红外光谱法快速鉴别PE和PVC保鲜膜

利用傅立叶变换红外光谱仪直接采集PE和PVC食品保鲜膜的红外投射光谱,比较了两种食品保鲜膜的红外光谱特征,明确了各自主要特征峰的归属.通过检索标准谱库与标准谱图进行对照,对两种保鲜膜进行了定性鉴定.该方法不需要任何样品前处理过程,具有快速、方便、准确的优点,是对市场上两种食品保鲜膜进行快速定性鉴别的理想方法之一.     

基于MPLS VPN技术的行业专网

行业专网对广域网的通信需求除了传送综合数据，还需要传输语音和视频信息，本文分析了MPLS VPN技术的原理和特点，提出了应用MPLS VPS技术实现行业专网的方法。     

基于磁盘隐藏PE文件搜索的Bootkit检测方法

Bootkit通过将加载时间点提前到引导阶段,能够对其操作系统下的恶意行为进行隐藏以绕过多数安全软件。为此,对Bootkit的动态行为隐藏机制进行形式化建模,扩展协同隐藏机制以揭示Bootkit高隐蔽性,并且利用大部分Bootkit在磁盘上隐藏恶意PE文件的特点,设计并实现一种PE文件匹配算法。实验结果表明,该算法在磁盘隐蔽扇区中匹配特定的模式串以寻找潜在的恶意PE文件,在针对Bootkit样本的检测中取得了较好效果。