CENTREX的创建

Centrex是一种集中交换业务,又称虚拟交换机,是数字程控交换机所具有的一种功能,是当今电话通信中最新应用技术。Centrex意思是在用户端不装任何小交换机,而由数字程控交换机直接向这个企业提供所有电话,可做到虽无小交换机,但这个用户的所有电话都可享有小交换机的基本功能,就像象这台小交换机集中到局用交换机中来了,故称为集中小交换机业务。本文介绍了Centrex基本业务功能、Centrex的特点以及Centrex的创建？     

基于桑达程控交换机的电话计费系统实现

程控交换机在大中型企事业单位广泛使用,如何和程控机进行接口数据交换、将电话管理功能集成到单位内部管理信息系统中是目前程控交换机用户迫切关注的问题。本文介绍了程控交换机的接口方式,探讨了电话计费系统的功能模块设计和实现方法,并以桑达程控交换机为例,给出了该程控交换机与电话计费系统的一种实用接口实现方法。     

虚拟用户交换机

集中式用户交换机实际上是电话局交换机的一个部分或是电话局交换机的一种功能，是在电话局交换机上将部分用户划分为一个基本用户群，向该用户群提供用户专用交换机的各种功能．同时还可以提供一些特有的服务功能。因为在这个用户群中并不存在专用的交换机，用户对内、对外的交换集中在电话局的交换机中，因此被称为“集中式用户交换机”，或被称为“虚拟用户交换机”。不仅适合人员集中的单位或部门使用，还适用于用户分机分散在不同地点的情况，组网灵活、并且能方便地增加或减少容量。采用集中式用户交换机的部门或单位，除了享用公用电话网的各种服务外还能获得电话部门的一些专业化服务。     

电话门禁系统

电话门禁系统,有效的把传统交换机和新型的智能平台、鉴权平台结合在一起,利用了交换机的字冠分析、话务交换功能,以及智能平台的电话桥接、鉴权平台的黑白名单功能,在中国电信市话网络的基础上实现了电话、门禁两种功能,不仅节省了开发商的投资,提高了小区的信息化管理程度,使住户与物业管理之间的沟通更便捷,同时借助与门禁系统的捆绑,增加了固定电话的附加功能,提高了用户对固定电话的依赖性。     

一种用计算机接收程控机数据由程序计费的方法

简要介绍了一种将计算机和程控交换机互连的方法，通过硬件串口中断处理程序，使计算机接收程控产生的电话数据，从而实现由计算机进行管理、控制、和自动计费的方法。     

一种小型语音信箱的实现

介绍了语音信箱（ＶＭＳＳ）的基本理论和它在通信领域中的主要应用；利用计算机和专用电话语音处理卡，开发了一种适合于用户交换机的小型语音信箱系统。     

新业务环境下S1240交换机话务分析及改善

S1240交换机在全国市场上的占有率超过1／3，尤其是骨干交换节点均为S1240交换机、随着IP业务飞速增长，电话接入Internet占有很大比例，交换机业务组成发生了变化，因此，探讨了Internet上网对S1240交换机局间中继及交换机内部主要模块配置的影响，提出了改善方案。     

探讨数字程控电话交换机的发展

1引言 自1876年美国贝尔发明电话以来，随着社会需求的日益增长和科技水平的不断提高，电话交换机技术处于迅速的变革和发展之中。其历程可分为3个阶段：人工交换、机电交换、和电子交换的电话交换机。     

通过IP网络延伸电话用户线

近年来计算机网络高速发展，IP网络已经相当普遍。而电话网也逐步实现了无人值守和集中监控。介绍了一种通过IP网络将交换机用户线延伸的技术．使在监控中心也能直接检测电话系统的通话情况。同时，这种系统也能应用于其它有IP网络、而电话用户线不能到达的场合。     

酒店虚拟交换网的实现方法

目前，酒店客房、服务台及办公室的电话通信，大多采用酒店自购的交换机、外接中继线的通信方式，这些交换机都是小型交换机，安装使用后往往维修、服务跟不上，因酒店缺乏专业的交换机维护人员，设备出现故障后，很难及时处理，这不仅将影响酒店的服务形象，而且影响酒店经理和员工与外界之间的通信联络。目前，我国大型通信运营公司有好几家，且他们的技术力量雄厚，设备维护人员遍布全国各地。若酒店采用虚拟小交换机ＣＥＮＴＲＥＸ技术，不仅可节省交换设备的投入，无需投入维护人员，节省财力和人力，而且可大大提高通信的可靠性。因此，酒店采用虚拟小交换机ＣＥＮＴＲＥＸ，其优点是显而易见的。酒店虚拟小交换机ＣＥＮＴＲＥＸ的构成，主要由通信运营公司的大型程控数字交换机和电缆线路组成，在酒店内部配置一台ＰＣ机做为话务台，通过插在ＰＣ机扩充槽内的ＩＳＡ总线接口的Ｕ卡，利用２Ｂ＋Ｄ的数字用户线和交换机建立通讯连接。交换机端侧需配一块Ｕ卡通信板。虚拟小交换机ＣＥＮＴＲＥＸ的主要功能有：群内按酒店要求设小电话号码，小电话号码可以和客房楼层、房间号相同；群内电话呼叫免费；分机权限修改，即根据客人的要求可以随时修改分机的呼入、呼出权限；业务登记／撤消；旅客可以通过...     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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