特洛伊木马隐藏技术分析

文章首先介绍了木马的定义,概括了木马的特征—隐蔽性、欺骗性、自启动性和自动恢复性,并简单介绍了木马的结构和功能。随后,从文件隐藏、进程隐藏、通信隐藏、芯片隐藏四个方面介绍了木马的隐藏技术,最后展望了木马技术的发展趋势。     

木马研究综述

木马是一种具有悠久传统且不断更新的网络攻击方式,随着网络技术的发展,木马出现了很多新的攻击和生存模式,对互联网安全造成了很大的危害。本文介绍了木马的基本定义,分析了其工作机制和功能结构,着重讨论了其植入、隐藏和检测方式,指明了其发展趋势。     

特洛伊木马攻击技术与防范策略

特洛伊木马是一种程序,它驻留在目标计算机里,随计算机自动启动并在某一端口进行侦听,对接收的数据识别后,对目标计算机执行特定的操作。其隐蔽性强,种类数量繁多,危害性很大。本文介绍了木马的攻击原理、常用攻击技术以及防范策略。     

新型特洛伊木马技术的研究

本文对特洛伊木马技术所采用的方法进行了分析,介绍了木马程序在植入、加载、隐藏以及在通信方面所采用的方法。在此基础上,分析如何基于动态链接库(DLL)和端口反弹木马技术实现木马程序。最后,给出了防范木马入侵的一般方法。     

恼人的"木马

介绍木马的产生与发展、木马的种类、远程控制型木马的运行原理、木马是如何植入计算机的,以及怎样预防与清除木马等。     

Cholesterol photosensitised oxidation of horse meat slices stored under different packaging films

The effect of the type of packaging film (transparent vs. light-protecting red film) was evaluated on the formation of cholesterol oxidation products (COPs) in refrigerated horse meat slices stored in retail conditions under light exposure for 8 h. In meat wrapped with a transparent film, COPs increased from 233 (control) to 317 μg/g of fat, whereas the red film delayed cholesterol oxidation and offered protection against COPs formation, since COPs decreased from 173 (control) to 139 μg/g of fat after 8 h of light exposure. In addition, light opened the epoxy ring and led to the formation of triol, which was actually absent at T_0. A proper packaging film may represent a useful strategy to retard oxidative degradation in a light-sensitive, high pigment- and fat-containing food, such as horse meat.     

POSIT: Part-based object segmentation without intensive training

Object segmentation is a well-known difficult problem in pattern recognition. Until now, most of the existing object segmentation methods need to go through a time-consuming training phase prior to segmentation. Both robustness and efficiency of the existing methods have room for improvement. In this work, we propose a new methodology, called POSIT, for object segmentation without intensive training process. We construct a part-based shape model to substitute the training process. In the part-based framework, we sequentially register object parts in the prior model to an image so that the searching space is largely reduced. Another advantage of the sequential matching is that, instead of predefining the weighting parameters for the terms in the matching evaluation function, we can estimate the parameters in our model on the fly. Finally, we fine-tune the previous coarse segmentation by localized graph cuts. In the experiments, POSIT has been tested on numerous natural horse and cow images and the obtained results show the accuracy, robustness and efficiency of the proposed object segmentation method.     

网上黑客工具——木马探讨（续一）

5木马的危害 木马的危害主要表现在远程控制方面。木马连接建立后，控制端端口和木马端口之间将会出现一条通道。     

调径变矩抽油机驴头的跌落仿真研究

针对抽油机驴头的掉落事故呈高发态势,基于多体系统动力学分析理论,建立了调径变矩抽油机的复杂机械系统运动学和动力学程式化的数学模型,进行了整机动力学分析,确定了驴头裂纹产生的区域和掉落的成因。以不同的跌落方式对驴头跌落过程进行模拟仿真,得到了跌落过程中动能、应力及速度的变化情况。总结不同跌落方式下的变量规律,确定了最危险的跌落方式。通过仿真对比分析得出:当驴头竖直方式跌落时最危险,其结果和实际情况相符,为其进一步的结构优化设计和机械类构件跌落冲击的有限元模拟提供了重要的依据。     

Enriching the egg yolk in n − 3 fatty acids by feeding hens with diets containing horse fat produced in Uruguay

The present study was conducted to evaluate the ability of horse fat produced in Uruguay, compared with other lipid sources supplemented in the diet of laying hens, to modify the lipid composition and the n − 6/n − 3 fatty acid ratio of the produced eggs. For this purpose, 60 laying hens (Gallus domesticus) were fed for 30 days with five experimental diets (12 hens/diet) containing 3% sunflower oil (SO), rice oil (RO), beef tallow (BT), pressed-fat (PF), obtained by pressing fat from bovine viscera, and horse fat (HF) obtained from horse bone medulla. Throughout the trial, feeding rate, shell index, weight and total lipid contents of eggs, were not affected by the different diets. Feeding on the SO and RO diets significantly increased the amount of linoleic acid of the egg, although it was lower in the RO than in the SO eggs. Diet BT did not affect the saturated fatty acid content of the yolks. The diets with animal fats containing 18:3n − 3 (diets PF and HF), resulted in a significant increase in the n − 3 fatty acid contents of the eggs, through an increase of linolenic (18:3n − 3) and docosahexaenoic acid (DHA, 22:6n − 3) contents. Eggs from hens fed the HF diet showed increased linolenic acid (46 mg/yolk) and DHA (71 mg/yolk, 1.7% of total fatty acids) contents. These levels were obtained after two weeks of feeding. Moreover, the fatty acid profiles of eggs from treatment HF were not significantly affected by thermal treatment of the yolks. In conclusion, the fat from horse bone medulla, as produced in Uruguay, can be considered as a suitable lipid source for diets of laying hens, to modify the nutritional composition of the eggs in n − 3 PUFA content, especially DHA, and consequently, the n − 6/n − 3 fatty acid ratio.