信息安全市场的经济学思考

和其他市场相比,信息安全市场比较特殊,即市场需求是派生需求,市场供给具有沉没成本高、扩散风险较大和供给动机多样化等特征。这些特征决定了信息安全市场发展的需求动力和供给动力,也决定了信息安全市场发展的制约因素。为此,应加大专利保护力度,明晰安全责任和加快制定政府规制和行业标准等措施,来推动信息安全市场的发展。     

Electricity Market Design: An Integrated Approach to Reliability Assurance

System reliability is an integral part of a properly designed deregulated electricity market, even though wholesale energy prices are its most visible piece. This paper discusses the resources, collectively known as the ancillary services, in a power system for maintaining reliability. It then discusses an integrated approach in systematically determining and securing the needed ancillary services and system configuration across multiple time spans, culminating in the cooptimization of energy and ancillary services for security-constrained generator unit commitment in the day-ahead market and security-constrained economic dispatch of the generators in real-time operation. The paper also provides a summary of the ancillary services market in several U.S. power markets and proposes several technical issues for further discussion and research.     

An Approach for Telecom Operators to Achieve Converged Telecom and Internet Services

This article discusses a possible approach for telecom operators to achieve converged telecom and Internet services. It involves integrally developing telecom networks and Internet businesses through the convergence of their instant news and social networking services. Some background, benefits for telecom operators, and possible challenges are analyzed. A new service convergence approach such as this can also facilitate triple-screen and multi-screen convergence in the future.     

An Approach to Integrating SIP in Converged Multimodal/Multimedia Communication Services

In this paper, we present an approach of integrating SIP (Session Initiation Protocol) in converged multimodal/multimedia communication services. An extensible VoIPTeleserver for VoIP in SIP environment is described. It is based on the concept of dialogue system and Web convergence that separates the channel dependent media resources from the application dependent service creation and hosting environment. It supports XML based service applications for multiple channels including voice, DTMF, IM and chat over IP. The loosely coupled open architecture in our approach is highly extensible. We describe the concept and structure of VoIPTeleServer used in our approach in detail, which interfaces to the VoIP world through SIP signaling and works as a broker between the VoIP SIP environment and MTIP to deliver converged communication services. A prototype of VoIPTeleServer was implemented, and services and applications based on SIP and MTIP convergence are constructed. Special attention is given to the adverse effect of delay, jitter and packet loss for voice portal services over IP. In particular, case studies of DTMF service in voice portal under adverse channel conditions are performed. The compounding effects of multiple channel impairments to DTMF in voice portal services over IP are characterized. The potential high error rate of the DTMF service indicates that the data redundancy method as proposed in RFC 2198 is needed for DTMF in order to achieve reliable voice portal services over IP.     

中国增值电信市场发展分析

本文分析了我国增值电信业务市场的竞争环境,资本结构以及区域发展特点,对增值电信业务总体发展情况和主要业务发展进行了介绍,并从技术、业务和政策等方面对增值业务的发展趋势进行探讨.     

一种基于典型业务特征的WLAN潜在客户标签生成方法

在总结传统方法局限性的基础上,提出一种基于典型业务特征判别的标签生成方法,阐述了识别WLAN潜在客户的关键特征变量及判别条件,并设计了基于同构数据的原型系统,可实现“WLAN潜在客户”标签规则的在线调试和标签生成。该方法具有业务解释性强、系统实现简单、维护便利等特点,并且在未来也能够与客户标签库体系的整体规划发展相匹配,完成快速实施和应用。     

我国未来3G业务特点分析

简要总结国内外3G市场运营的基础上详细分析了我国未来的3G业务,并归纳出了三大特点:话音业务占主流、增值业务大发展、数据业务集中在行业应用,为我国3G相关企业提供了借鉴.     

Consumer Vehicle Telematics — An Emerging Market Where Web Services

This paper examines how Web Services can be used to provide a shared infrastructure in an emerging area of consumer communications, namely consumer vehicle telematics. The paper reviews the key advantages which Web Services offer from a service provider's viewpoint — namely openness, reuse and ease of integration with legacy systems. The paper then goes on to examine why the consumer vehicle telematics industry is an area where point solutions have been developed. It then explores why legislation, changes in industry dynamics and the growing use of electronics in vehicles make the use of Web Services, in the software platform supporting the applications, an attractive proposition. Using a scenario-driven approach, it is shown how Web Services can be employed to provide reusable components which can make applications available for vehicle manufacturers, vehicle dealers, legislators and third-party service providers. These applications can be used to provide information to drivers, occupants and vehicles themselves. The paper also presents a brief review of the emerging competitive environment. This revised version was published online in July 2006 with corrections to the Cover Date.     

IP业务预测及中国网通市场占有率分析

文章预测了“十五”期间中国IP市场规模及中国网通IP业务市场可能的占有率，分析了几个导致预测产生误差的原因。并提出了一些减少预测误差的建议。     

全球青年的移动业务市场发展策略分析

中国移动近期在全国范围大力推广其定位于年轻人的业务品牌动感地带，这证明：青年市场是移动通信市场的生力军,运营商要把握先机抢占这块市场!这块市场具有什么样的消费行为，是什么唤醒了移动运巷商使其开始重视这块市场，而国外对该市场又采取了何种行动呢?     

Comprehensively Context-Aware Approach to Guaranteeing Multimedia Conferencing Services

Service-Oriented Communication （SOC） is a key research issue to enable media communications using the Service-Oriented Architecture （SOA）. Motivated by the neces- sity to guarantee the service quality of our web- based multimedia conferencing system, we pr- esent a Comprehensively Context-Aware （CoCA） approach in this paper. One major problem in the existing end-to-end Quality of Service （QoS） management solutions is that they analyse and exploit the relationships between the QoS me- trics and corresponding contexts in an isolated manner. In this paper, we propose a novel app- roach to leveraging such relationships in a comprehensive manner based on Bayesian net- works and the fuzzy set theory. This approach includes three phases： 1） information feedback and training, 2） QoS-to-context mapping, and 3） optimal context adaption. We implement the proposed CoCA in the real multimedia con- ferencing system and compare its performance with the existing bandwidth aware and play- back buffer aware schemes. Experimental re- sults show that the proposed CoCA outper- forms the competing approaches in improving the average video Peak Signal-to-Noise Ratio （PSNR）. It also exhibits good performance in preventing the playback buffer starvation.     

An Approach to the Analysis of Performance of Quasi-Optimum Digital Phase-Locked Loops

An approach to the analysis of performance of quasioptimum digital phase-locked loops (DPLL's) is presented. An expression for the characteristic function of the prior error in the state estimate is derived, and from this expression an infinite dimensional equation for the prior error variance is obtained. The prior errorvariance equation is a function of the communication system model and the DPLL gain and is independent of the method used to derive the DPLL gain. Two approximations are discussed for reducing the prior error-variance equation to finite dimension. The effectiveness of one approximation in analyzing DPLL performance is studied.     

基于贝叶斯置信网的日志服务系统容侵方法研究

文章针对服务器系统被攻破之后。如何保护服务器系统所记录的日志。为以后系统的恢复提供依据．并且提高系统自身生存能力的难点．提出将日志记录按照一定的格式进行分片．将不同的分片存储在不同的日志服务器上的容侵策略。当需要进行日志还原时，再将日志分片组合成原来的日志。构建了系统的异常发现贝叶斯网络模型。该模型根据用户访问日志服务器所提供的特征信息。可以判断出该次访问是否异常行为和所访问目志类型，从而在海量日志信息中快速定位受攻击的服务器及其日志片段．以最小的系统开销恢复可能已经被破坏掉的某一类日志记录．该方法在一定程度上保证了日志记录服务器中日志记录的准确性和正确性。     

An introduction to Web Services

This paper provides an introduction to Web Services. A brief history of Web Services is given, leading into an overview of the key Web Services technologies. The paper describes the way in which the IT industry has embraced Web Services and the uses to which the technologies are currently being applied. It concludes with a view of the role of both the key developers and standards bodies in the creation of Web Services and discusses the ways in which this process needs to be supported in order for Web Services to evolve. This revised version was published online in July 2006 with corrections to the Cover Date.     

基于视觉注意的遥感图像分析方法

该文根据人类视觉系统的生理结构与认知特点,提出了一个基于自底向上视觉注意的遥感图像分析模型,并在此基础上开发出了一种新的遥感图像分析方法。该方法在一定程度上具备了类似于人类视觉系统的选择性加工能力。将其应用于多种类型的真实遥感图像,获得了较为满意的实验结果。     

An Incremental Approach to the Analysis and Transformation of Workflows Using Region Trees

The analysis of workflows in terms of structural correctness is important for ensuring the quality of workflow models. Typically, this analysis is only one step in a larger development process, followed by further transformation steps that lead from high-level models to more refined models until the workflow can finally be deployed on the underlying workflow engine of the production system. For practical and scalable applications, both analysis and transformation of workflows must be integrated to allow incremental changes of larger workflows. In this paper, we introduce the concept of a region tree (RT) for workflow models that can be used as the central data structure for both workflow analysis and workflow transformation. An RT is similar to a program structure tree and imposes a hierarchy of regions as an overlay structure onto the workflow model. It allows an incremental approach to the analysis and transformation of workflows, and thereby, significantly reduces the overhead because individual regions can be dealt with separately. The RT is built using a set of region-growing rules. The set of rules presented here is shown to be correct and complete in the sense that a workflow is region-reducible as defined through these rules if and only if it is semantically sound.     

一种基于模态分解的时频分析方法

阐述了基于模态分解的时频分析方法的基本原理及特点。并与其他时频分析方法相比较，说明了该方法用于信号进行时频分析的可行性和优点，最后指出了该方法亟待解决的几个问题。     

Broad-Band Interactive Communication Services to the Home: Part I--Potential Market Demand

This paper describes a questionnaire-type survey conducted in 1970 of the nature, size, and composition of the likely market for broad-band two-way services to the home. Market demand characteristics are considered in detail for thirty likely services. The composite magnitude of the industry is estimated as essentially starting in 1980 and building up to a dollar volume of $20 billion per year.     

利用多项目晶圆服务降低芯片开发费用与风险

引言 一部分集成电路的NRE(一次性工程费用)被控制的越来越紧,但是另一部分却并非如此,典型的掩模组的价格急剧上升.     

An Approach to Frequency Assignment

Frequency assignment should be based on minimization of the unwanted interactions between equipment in an environment. An approach to this problem is developed, based on the operations research technique known as dynamic programming. The basic tools required are an interference prediction model that is capable of providing relative values and a means of deciding which objective function is to be evaluated, i.e., which environmental interference measure is to be used. This concept is not presented as a procedure to be followed but as a logical framework to be modified as desired.