小型程控交换机呼叫处理调度的探讨

程控交换机呼叫处理程序面临多用户和实时性的矛盾,常用的呼叫处理调度方法各有利弊。本文针对小型程控交换机的特点,提出多级中断调度不同时限要求的处理程序和待处理事件排队的方式,从而解决了程控交换机中应答速度和过负荷问题。     

程控数字交换模拟系统设计

在廉价的微机上实现程控数字交换机的模拟,该“模拟交换机”所有硬件动作均由软件模拟完成,它能进行呼叫处理,并有各种信号音、振铃和通话等各种功能。     

Meridian 1 Option11C程控交换机基本故障处理

Option11C为北电小型程控交换机,程控交换机中继主要有模拟中继与数字中继。在日常设备维护中,经常出现各种呼叫失败的情况。针对这个情况了解程控交换机基本故障处理,能更快地解决问题,为企业节约成本,从而提高交换机的利用率。     

解析CC08程控交换机呼叫处理流程

本文详细分析了CC08程控数字交换机呼叫处理流程,局呼叫、出入局呼叫以及汇接呼叫,列举了呼叫接续典型案例分析。了解交换机呼叫处理控制过程可为设备维护中故障分析、准确定位提供理论依据,缩短故障处理时间,提高工作效率。     

程控交换仿真实验系统的设计

本文根据程控交换技术,设计了一个程控交换仿真系统,该仿真系统的目的是通过普通的芯片来仿真实现程控交换机的主要功能。该系统包括了硬件和软件两部分,硬件电路采用单片机为核心来构成控制系统,还包含了接口电路和交换网络等各个部分,实现了仿真程控交换机各部分功能的目的。在硬件电路的基础之上,设计了程控交换仿真系统的软件部分,实现了自动局内的呼叫处理功能。     

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。     

交换机座席控制系统呼叫过程中的定时处理

基于某种大型局用程控交换机座席控制系统的实际工作原理，详细分析了座席控制系统呼叫过程中的各种定时问题，研究了具体解决方法，即：定义一个含有定时器字段的双向链表，并按定时先后排序．对不同的定时数据，维护不同链头．定时处理定时器，同时根据链头呼叫记录的状态和定时器值进行不同处理．该方法不仅适用于交换机的座席控制系统，对其他多任务复杂系统也适用．     

交换机座席控制系统呼叫过程中的定时处理

基于某种大型局用程控交换机座席控制系统的实际工作原理，详细分析了座席控制系统呼叫过程中的各种定时问题，研究了具体解决方法，即：定义一个含有定量器字段的双向链表，并按定量先后排序，对不同的定量数据，维护不同链头，定时处理定时器，同时根据链头呼叫记录的状态和定量器值进行不同处理，该方法不仅适用于交换机的座席控制系统，对其他多任务复杂系统也适用。     

实时事务并发控制在程控交换机中应用的研究

针对程控用户交换机与ＰＣ机通信数据库中对数据可靠性、实时性要求,提出一种实时关系数据库管理系统中实时事务并发控机制在程控用户交换机与ＰＣ机通信中应用的方法．     

一种程控交换机软件任务调度方法

程控交换机软件实际上是一个实时操作系统软件,其任务调度比较复杂。本文主要探讨一种周期级任务调度方法,举例说明了其在程控交换机软件中的具体应用。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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

正~~