基于GPRS短消息收发系统的设计

本文给出基于GPRS的终端式短信的远程监控系统的架构及运行原理。本文介绍了依照SIM300和GSM07.05规范实现短消息的收发功能,和利用多线程、嵌入式操作系统和AT指令等技术来构建这一平台的具体方法 ,为充分利用各种信息工具提供了一种新的思路。     

Case studies of defect localization based on software-based fault diagnosis in comparison with PEMS/OBIRCH analysis

This study verifies the accuracy of failure localization by a software-based fault diagnosis technique through comparison of the failure localization by photo emission microscope (PEMS) analysis and optical beam induced resistance change (OBIRCH) analysis. To evaluate, the software-based fault diagnosis technique was applied to 14 samples of 0.18 μm-process-node products that failed mainly due to the metal line shorts. We found that this technique was able to accurately localize the failure with a high probability (85.7%). One reason, the diagnosis returned inaccurate results is the influence of the metal line short expanding to several nets in the device simultaneously due to shorts of upper and lower metal lines. The other reason is that the fail log of the failed device itself was inaccurate due to (1) the resistance value at the short point, (2) the driving force of the cells related by the shorted points, and (3) the transition timing. We determined from our study that the rank of score calculation depends more on the mismatch rate of pass patterns than on the match rate of fail patterns. When the mismatch rate of pass patterns is less than 0.04 and the score is more than 70, the software-based fault diagnosis result is reliable. Although software-based fault diagnosis is a powerful tool for failure localization, it is necessary to combine it with hardware techniques such as PEMS analysis and OBIRCH analysis to maintain the accuracy of failure localization.     

The incompatibility of crossing number and bridge number for knot diagrams

We study methods for computing the bridge number of a knot from a knot diagram. We prove equivalence between a geometric and a combinatorial definition of the bridge number of a knot diagram. For each notion of diagrammatic bridge number considered, we find crossing number minimizing knot diagrams which fail to minimize bridge number. Furthermore, we construct a family of minimal crossing diagrams for which the difference between diagrammatic bridge number and the actual bridge number of the knot grows to infinity.     

基于贝叶斯算法的短信营业厅防护系统设计

针对电信运营商短信营业厅系统易受垃圾短信影响的问题,给出一种基于贝叶斯算法的短信营业厅防护系统构建方法,即在现有系统的基础上,另外构建一个与现有业务系统无耦合的独立系统,部署在短信营业厅系统前端进行短信预处理。新系统主要由文本特征提取模块、分类模块、过滤模块组成,对接收到短信按贝叶斯算法进行分类,按规则库进行过滤和清洗垃圾短信,将有价值的短信送到短信营业厅系统处理,减少垃圾短信对系统资源的开销。理论分析显示,利用所建系统,可达到对短信营业厅有效防护效果。实践证明,防护系统应用后,短信营业厅系统资源消耗下降。     

浅谈软件定义网络中数据平面的通用性和控制平面的可扩展性(英)

The control and data planes are decoupled in software-defined networking(SDN),which enables both planes to evolve independently,and brings about many advantages such as high flexibility,programmability,and rapid implementation of new network protocols.However,in order to improve the scalability of the control plane at present,some control functionalities are added to the data plane,which is probably to impact on the generality of the data plane.The key challenge of adding control functionalities to the data plane is to strike a careful balance between the generality of the data plane and the scalability of the control plane.We propose some basic principles that both control and data planes should comply with,based on the evolutionary trend of SDN.Moreover,we take two approaches for reference according to the principles,viewed from the control messages in OpenFlow-based SDN.Our evaluations demonstrate that the approaches can maintain the generality of the data plane and improve the scalability of the control plane.     

2H桥3^N-1级联式UPS

介绍了一种新型的2H桥级联式UPS的基本工作原理和控制方法。     

基于概念网的短消息安全过滤技术分析与研究

目前短消息非常流行,针对这类信息如何进行实时信息监控及舆情分析至关重要。为了实现该类信息的内容安全监控,论文主要研究了采用概念网技术来实现对短信息中不良文本的过滤。     

3G中的编解码协商技术

由于在接入网和核心网传送的码流格式不一致，造成话音信号进行两次编码和解码，导致语音质量降低。因此必须采用编解码协商技术来统一全程的编解码。编解码协商技术主要有无码型变换器操作（TrFO）、无二次编解码操作（TFO）和审计网络质量优选编解码技术。TrFO是呼叫建立过程中优选的一种机制，它尝试去建立用户设备（UE）到UE的无需使用码形变换器（TC）的连接，如果成功，能够最有效地使用带觅；TFO作为TrFO的备用技术，是一种带内的编解码协商协议，因为用户面码流不再需要通过语音编解码器的压缩、解压缩处理，可以改善话音质量；审计网络质量优选编解码技术依据呼叫的接入数来灵活地选择采用G．711或G．729来编解码，作到既不过分加重网络的负担，同时又可以接入新的呼叫。     

移动短信国际互通业务解决方案

通过对国内移动短信网络现状及短信国际业务分类的相关分析，给出了移动短信国际互通的实施方案。     

面向对象的软件原型化可操作模型OPM

基于OMT(Object Modeling Technique),面向软件原型化领域,提出了可操作模型OPM(Object-Oriented Prototyping Modeling)。OPM是在对象模型OM(Object-Model)之上的一种二维的模型化方法,纵向,功能对象的APO抽象与继承的自顶向下模型化机制;横向,功能对象的有穷状态机中,状态对象的AKO抽象与继承的逐步细化的模型化机制。OPM通过当前状态对象的转换、消息授受来描述系统行为,原型化深度通过上述二维的对象模型化粒度来刻划,并给出了OPM应用的具体例子。