对付垃圾邮件的有效途径

垃圾邮件是在因特网中广泛存在的一个问题。文中分析了垃圾邮件的危害及产生的原因 ,提出了对付垃圾邮件的有效途径 :禁止邮件转发 ,追踪所有邮件的网络来源 ,确定电子邮件的发送者 ,处理用户投诉 ,公布对发送垃圾邮件的用户所采取的措施及对用户进行培训等。     

浅谈反垃圾邮件系统在网络中的应用

本简要地分析和概括了垃圾邮件的种类和内容：从技术的角度上介绍了垃圾邮件的制造是如何获得邮件用户的邮件地址，发送垃圾邮件；还介绍了反垃圾邮件系统之一——邮件网关的种类以及及其处理垃圾邮件的方法。     

反垃圾邮件技术探讨

本文针对目前Internet上广泛存在的垃圾邮件问题进行了深入的讨论,介绍了垃圾邮件的定义,产生的原因及来源,分析了垃圾邮件的危害,并重点论述了反垃圾邮件的一般技术。     

如何有效处理垃圾邮件

本文介绍了垃圾邮件的定义、危害和处理措施,设计和分析了一个自动垃圾邮件投诉的系统,最后提出了一个在互联网上有效制止垃圾邮件的建议.     

基于用户反馈的个性化垃圾邮件过滤方法

如何在传统垃圾邮件过滤技术基础上实现垃圾邮件个性化过滤是垃圾邮件过滤领域的重要课题。提出一种基于用户反馈的个性化垃圾邮件过滤方法,一方面将用户反馈应用于邮件分类特征的更新,提取用户个性化邮件分类标准;另一方面,将全局邮件分类标准和用户个性化分类标准综合应用于朴素贝叶斯分类过程,实现用户邮件个性化分类。仿真实验结果表明,在用户邮件分类标准存在差异的环境下,基于用户反馈的个性化垃圾邮件过滤方法能够有效提升传统垃圾邮件过滤技术的邮件分类效果。     

垃圾邮件过滤技术发展现状及展望

电子邮件随着Internet的发展给人们带来了方便,但随之而来的垃圾邮件也给人们带来了不少的烦恼。针对垃圾邮件技术的发展与现状,本文对目前的垃圾邮件过滤技术进行了分析,并指出垃圾邮件过滤的发展趋势。     

梭子鱼解决基金管理公司难题

垃圾邮件不仅会消耗企业的各种资源,还会给企业的正常运行带来众多安全隐患,已经从一个“小烦恼”升级为“信息安全问题”。为此,易方达基金管理有限公司决定采用国际知名安全厂商梭子鱼网络有限公司旗下的梭子鱼垃圾邮件防火墙,来解决日益复杂的垃圾邮件难题。     

中国电信“平安网络”力助行业大客户腾飞

长期以来，中国电信一直致力于保持网络安全方面的各项工作。近年来中国电信更是加大了反垃圾邮件工作的力度，建立了比较完整的反垃圾邮件工作体系。一是加强内部管理，建立和完善垃圾邮件处理办法和流程；二是采用技术手段减少垃圾邮件的发送数量，三是加强对外交流与合作，与国内外反垃圾邮件组织、运营商建立了良好的沟通渠道。通过对垃圾邮件的综合治理，中国电信的垃圾邮件投诉量较前两年有明显下降。     

垃圾邮件的长尾现象分析及应用

随着互联网的发展,网络应用越来越广泛,电子邮件已经成为人们日常生活中通信和交流的重要手段之一,但垃圾邮件和病毒邮件问题也日益严峻,每天收到的垃圾邮件和病毒邮件数量已经超过了正常邮件,严重影响了用户对电子邮件的正常使用。文中从长尾理论的概念入手,简单介绍了长尾理论的应用,通过对过滤的垃圾邮件和病毒邮件进行统计和分析,揭示了垃圾邮件和病毒邮件也具有长尾现象,从中得出了防止和控制垃圾邮件和病毒邮件的新方法和新途径。     

垃圾邮件分析及其应对策略的探讨

当今网络安全问题在电子邮件系统方面表现尤为突出，垃圾邮件的发展给社会、经济及技术带来了非常恶劣的影响。首先对垃圾邮件的的产生和垃圾邮件的现状做了分析；阐述了垃圾邮件的技术根源及其影响；对现阶段反垃圾邮件处理技术及方法做了归纳总结．同时给出了自己的一些看法和观点。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.