电子商务个性化推荐服务过度的解决方案

个性化服务日益成为人们关注的焦点,其中个性化推荐服务也是研究的热点,在个性化推荐服务提供的过程中需要避免服务过度的情况。文中基于Web挖掘技术在电子商务个性化推荐服务中广泛运用,分析了用户兴趣模式构建的过程以及在电子商务个性化推荐服务中的应用。继而从隐私泄露和个性化信息过载角度探讨个性化推荐服务过度的问题。最后提出了通过改进个性化服务过度的挖掘过程、改善用户兴趣模式构建、建立规范和主动提供服务的解决方案。     

关联规则在移动电子商务推荐系统中的应用

以数据挖掘中的关联规则为基础,深入研究了个性化推荐系统的架构和推荐系统模型。针对传统关联规则挖掘算法在解决移动电子商务环境个性化推荐问题时反复扫描数据库,频繁项挖掘效率低,关联规则挖掘准确率低以及规则大量冗余等不足,采用基于事务矩阵和兴趣度的关联规则挖掘算法构建个性化的推荐系统模型,提升了个性化推荐质量。     

Web使用挖掘在网络环境下的个性化信息服务

随着Internet的迅速普及和互联网上信息量的大量增加,个性化的信息需求也随之巨增,Web使用挖掘已成为实现个性化信息服务的一个关键技术。讨论了个性化服务的基本特征,并基于这种特征分析了Web使用挖掘在网络环境下个性化信息服务中所起的作用,还讨论了基于Web使用挖掘的Web个性化技术。针对个性化系统的功能介绍相关预处理技术及其在个性化系统中的应用。     

Web数据挖掘在电子商务中的应用与实现

电子商务运营过程中,存在着海量的数据,将会增加数据处理的难度,需要注重Web数据挖掘的应用,提高数据的处理水平。基于此,文章先从客户群体、站点设置、个性化分析三个方面对Web数据挖掘在电子商务中的需求进行分析,对数据处理需求进行明确,确保技术运用具有针对性;再从挖掘目标、数据模型等方面对技术实现进行分析,实现数据挖掘技术的有效运用;最后,分析Web数据挖掘的具体应用,对电子商务进行处理,保障数据挖掘目标的实现。     

智能图书馆个性化推荐服务系统构建研究

从图书数据资源挖掘、个性化推荐服务的角度出发,利用关联规则数据挖掘与清洗技术、UML建模工具,针对不同图书馆的读者类型、功能或服务需求,建立起智能图书馆个性化推荐服务系统,设置用户管理模块、数据处理模块、热门图书推荐模块、个性化图书推荐模块,完成对不同类别图书资源的检索、挖掘、存储与智能推荐,以取得较为良好的图书咨询与管理、个性化推荐服务效果。     

基于Web使用数据挖掘的个性化推荐系统设计

Web使用挖掘是实现个性化推荐系统的有效途径。通过对网站日志数据进行挖掘发现频繁访问模式,再结合活动用户的访问页面序列来实现个性化的在线推荐。本文从体系架构及功能模块两个方面进行分析,提出了基于Web使用数据挖掘的个性化推荐系统架构。它包括三个方面:数据预处理、频繁访问路径挖掘及在线推荐。     

关联规则在电子商务推荐系统中的应用

以数据挖掘中的关联规则为基础,深入研究了基于关联规则的个性化推荐技术在电子商务中的应用,提出了电子商务推荐系统的体系结构,并对系统涉及到的关键技术进行了详细的描述.系统采用FP-Growth算法进行关联规则的挖掘,紧紧结合了数据库技术的优势,对当前电子商务系统中大量复杂的数据具有很好的适应性.     

基于WEB挖掘的关联推荐算法

通过Web挖掘分析用户需求,利用关联规则实现Web个性化,向用户提供个性化服务已经成为当今Web技术的研究热点.文中根据网络教学系统的个性化需求,针对Web个性化推荐算法及其改进算法中存在的问题,提出一种结合网站结构和内容挖掘的个性化关联规则的推荐算法.离线生成频繁访问路径聚集图,在线结合网站结构,动态地向用户进行在线推荐.并对改进后的算法进行仿真测试,实验表明改进算法可以更加节约存储空间,提高推荐准确率和覆盖率.     

基于加权关联规则挖掘算法的电子商务商品推荐系统研究

为了解决电子购物者和商家直接的商品快速、准确匹配问题,进行基于加权关联规则挖掘算法的电子商务商品推荐系统研究。首先指出了经典Apriori算法的缺点和不足,并提出一种新的加权模糊关联挖掘模型算法,以保证频繁项集的向下封闭性;通过对电子商务推荐系统的结构化设计、数据预处理模块设计、推荐模块设计,完成了推荐系统的工作流程测试;最后选取命中率作为不同推荐模型的评价标准,通过五折交叉试验法对实际采集数据进行了对比分析,试验结果表明关联规则集的Top-N产品命中率要明显高于兴趣推荐和畅销推荐法。     

动态采集与关联规则在个性化推荐中的应用

一个网站有多个网页组成,网站上的信息分布在这些网页上,不同的用户对不同的网页上的信息感兴趣,如何满足用户对敏感网页的高效访问,我们提出一个基于使用挖掘的Web站点个性化信息服务系统来解决问题.利用Web使用挖掘技术来分析用户的浏览模式,根据用户的当前访问需要,自动实时地为用户提供推荐页面,实现个性化服务.     

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