蜂窝移动通信欺诈的新动态

一、反欺诈的紧迫性 通信中的欺诈是指非法用户采用非法手段,不支付通信费用而盗用通信设备,造成运营商和用户的经济损失。回顾过去,欺诈在移动通信中造成的损失让人触目惊心。 根据分析家和市场研究人员的分析,全球的欺诈损失在总业务收入中由1％猛增至5％。到2000年为止,欺诈损失在全球范围约为14亿美元。     

国际漫游欺诈防治与高价值用户的识别

本文介绍了国际漫游欺诈通用的防治方式，并在此基础之上提出了高价值用户识别的概念，以帮助运营商快速确定是否能对欺诈分析报告中的用户执行停机操作，同时也有助于市场人员分析用户行为，挖掘高价值用户。     

国际漫游欺诈防治与高价值用户的识别

本文介绍了国际漫游欺诈通用的防治方式,并在此基础之上提出了高价值用户识别的概念,以帮助运营商快速确定是否能对欺诈分析报告中的用户执行停机操作,同时也有助于市场人员分析用户行为,挖掘高价值用户.     

移动通信中“火眼金睛”——亚信德康欺诈监测与分析系统

随着移动通信的迅速发展，利用移动通信手段进行恶意欺诈的现象也越来越多。据统计，1998年全球因欺诈造成的损失高达130亿美元，其中移动通信占了50亿美元，欺诈行为造成的损失已占运营者收入的5％以上，并且仍在以每年10％以上的幅度增长。反欺诈已成为摆在各运营商面前的紧迫问题。     

移动通信计费中的反欺诈技术

如何有效地防止和遏制欺诈行为的发生一直是移动电话运营商关注的一个焦点,本文介绍了国内外已出现的移动电话欺诈手法,讨论了一种基于呼叫详细话单分析,对欺诈行为进行识别和制止的框架,还提供一种快速聚类算法。其对话单的分析思想也适用于其他电信网     

第三代移动通信中的欺诈管理与防范对策

欺诈每年都给电信行业带来巨额损失。3G由于其自身的特点和提供的服务的特点，将会面临电信欺诈的巨大威胁。从目前看，尽管3G将会面临各种欺诈风险，但最可能最普遍的是盗窃SIM卡和终端，并采用多种欺诈入网的方式来购买和转售网上商品。运营商应当严格控制销售流程，并建立行之有效的反欺诈管理系统。     

稳鸿科技的反欺诈解决方案

该介绍了来自稳鸿科技有限公司的移动通信反欺诈解决方案PROvent(移动电话欺诈侦测系统）和BOSS（商业运营支持系统）。     

电信网络服务的欺诈管理(一)

电信运营商,尤其是移动运营商的网络日益复杂、服务日益丰富、价格体系灵活多变,营销环节日益复杂,造成时运营支撑体系的要求越来越高,运营商与用户的关系也日益复杂。如何防止网络服务被欺诈或误用、减少恶意欠费和网间结算亏损是网络运营商面临的一个重要问题。为了帮助运营商分析用户行为,采取措施发现和阻止异常行为,迫切要求在运营支撑系统中部署有效的欺诈管理系统,及时侦测到网络欺诈行为,采取相应预防和制止措施,运营商应尽快减少和避免收入流失损失。本文主要阐述电信运营商所面临的欺诈风险以及需要采取什么样的技术手段防止和消除欺诈风险带来的营业收入流失。     

4G网络中反欺诈URL方案简析

智能手机超越PC终端,成为获取网络资源第一终端。移动终端的安全问题日益凸显,特别是以"钓鱼、欺诈网站"为首的欺诈URL(统一资源定位器)问题,严重影响用户使用移动互联网的信心。文章首先分析欺诈相关投诉,发现主要为欺诈URL,且具有域名变化频繁、相似度高、时效性短等特点;随后分析欺诈URL的主要传播途径;其次,以此为基础分析欺诈URL拦截技术难点和重点,提出反欺诈URL平台解决方案;最后探讨如何在运营商4G网络中部署反欺诈URL平台。     

电信网络服务的欺诈管理(四)

电信运营商,尤其是移动运营商的网络日益复杂、服务日益丰富、价格体系灵活多变,营销环节日益复杂,造成对运营支撑体系的要求越来越高,运营商与用户的关系也日益复杂。如何防止网络服务被欺诈或误用、减少恶意欠费和网间结算亏损是网络运营商面临的一个重要问题。为了帮助运营商分析用户行为,采取措施发现和阻止异常行为,迫切要求在运营支撑系统中部署有效的欺诈管理系统,及时侦测到网络欺诈行为,采取相应预防和制止措施,运营商尽快减少和避免收入流失损失。本文主要阐述电信运营商所面临的欺诈风险以及需要采取什么样的技术手段防止和消除欺诈风险带来的营业收入流失。     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks