同步通信

A data aid carrier synchronization scheme for high rate burst mode communication systems is given.

高速突发通信系统要求同步时间尽可能短，通过对一种数据辅助式快速相位捕获算法的分析，提出一种π/4-DQPSK调制信号的载波同步方案。

The beauty of the Sync Framework is that it makes even that task a lot easier, you can communicate on any channel using any protocol and still sync up your data with the main data source in many configurable ways.

在同步框架的优点在于它使这项工作更容易得多，你可以在任何通信使用任何协议，仍然与同步在许多配置方面的主要数据源的数据通道。

Firstly, this paper puts forward an improved authentication and key distribution scheme for internet environment, in which we adhibit multilevel authentication center, encryption technology of DES, RSA and one-way function to actualize the safety of communication among the different user on network and reduces the workload of the authentication institution; at the same time, this scheme can also assure the security of network. Besides, it use the temporary symbol and the responds" sign of both-side correspondent to replace time stamp and applies them to internet communication to countercheck "rebroadcast attack and accordingly resolves the problem that it needs synchronization for network clock.

本文在首先提出一种改进的Internet网络环境下的认证及密钥分配方案，该方案考虑采用了多级认证中心，DES、RSA和单向函数加密机制，实现了网络上不同用户间的安全通信，降低了网上认证机构的工作量，同时也能够保证网络的安全性；并用通信双方的临时标志和响应者标识来代替时间戳应用于Internet通信中以防止"重播"攻击，从而解决了以往需要网络时钟同步这一难题。

Different to the conventional information communication, Information intercepting technique have to be faced with the following basic difficult problems: the blind recognition of the parameters of the communication; the blind recognition of the parameters of the signal; how to efficiently process the fading signal which power is under the receiving threshold of the conventional communication; how to demultiplex the mixed information stream with serious errors; and how to determine the value of the information etc.

有别于常规的通信技术，信息截获技术面临如下重大的基本难题：通信体制参数的盲识别；系统信号参数的盲识别；如何实现对强度低于常规通信接收门限的衰落信号的高增益；如何实现对混合信息流的高容错同步分路；以及如何实现对信息价值的判定。

The present paper uses the direct sequence spread spectrum technology, key to short-wave communication and direct sequence spread spectrum correspondence characteristic as well as union advantage, wide frequency code production, the direct sequence spread spectrum communications system technology and the principle, the wide frequency synchronization technology, the RAKE receive technology has conducted the research and the analysis.

本论文采用直接序列扩频技术，重点对短波通信与直接序列扩频通信的特点以及结合的优点，扩频码的产生，直接序列扩频通信系统的技术与原理，扩频同步技术，RAKE接收技术进行了研究与分析。

The contents of the course include: what operating system are, what they do, how they are designed, and where they came from; a general history and explanations of computer system, and some discussion on hardware and the relation between operating system and other software; concept of process, process states and process control block, process queue, management of processes; concepts of sequent programming and parallel programming, process synchronization and its application, process communication; scheduling level and job state transition, job scheduling, process scheduling, and methods for scheduling; deadlock and its necessary conditions, deadlock prevention, control and recovery of deadlock; fixed partition, multiple partition and replacement partition memory management, swapping and overlays; page, segmentation and segmentation with paging storage management, basic concept of virtual memory management, and page, segmentation and segmentation with paging memory management.

课程的内容包括：计算机系统概述、操作系统的形成、发展、功能、特性、类型和发展趋势；操作系统的硬件环境、操作系统与其它系统软件的关系；进程的概念、进程的状态和进程控制块、进程队列、进程的管理；顺序程序设计和并行程序设计概念、进程间的同步与互斥、同步机构应用、进程间通信；调度的层次和作业状态转换，作业的调度、进程调度、调度算法；死锁问题的提出、死锁的必要条件、死锁的预防、避免、控制和恢复；固定分区、可复分区、多重分区内存管理技术以及覆盖技术和交换技术；分页域、分段域、段页域存储管理技术、虚拟存储管理的基本概念、分页域、分段域、段页域虚拟存储管理。

The Wide Area Measurement System is based on Synchronized Phasor Measurement and the technology of modern communication.

基于同步相量测量和现代通信技术的广域测量系统(Wide Area MeasurementSystem，WAMS)可以提供电力系统多个节点的同步信号，这些广域信号均是实时测得的，具有较高的精度和可信度。

In this paper, a CWE model of the distance education system is provided. In order to enhance the bandwidth utilization factor, a transfer method based on multi-channel is presented. Both the transmission of real-time media stream and time-stamp technologies are introduced to the system to ensure the requirement of real-time characteristic and synchronism, and a simple protocol based on RTP (Real-time Transfer Protocol) and UDP is designed. The method, event simulcast, is also brought forward to reduce the data redundancy and expand the collaboration scale of the system.

本文给出了远程教学的协同工作环境模型；设计中为了提高系统带宽利用率，采用一种更符合实际应用要求的"单播+广播"的有效通信方式；为了解决音视频同步问题，参考实时媒体流和时间戳同步技术，设计了一个基于用户数据报协议UDP和实时传输协议RTP的简单传输协议，实际应用中保证了数据的实时性和同步性；系统采用基于显示同播的事件同播方式，这样在一定程度上降低了数据冗余，同时扩大了系统的用户数量。

The whole PPT-reports of the Forum have put into "Complex Network Science Forum Circle" on Science Network in China (Please see: hettp//www.sciencene.cn/g/ComplexNets ) and also appear on the CCAST-WL Webside (Please see: www.ccast.ac.cn/workshop ). Main issues of the Forum are associated main subject of Network Science with application, including: review and outlook of network science ,spreading model of the H1N1 influenza virus , dynamics of neural network , brain functional networks,dynamics of topological structure, military network science with application, space structure of complex networks, community structure,,stationary e fficiency of coevolutionary networks , significance of community structure,,relationshipe between structure and dynamics of complex network, generalized synchronization and control, consensus of multi-agent systems, evolutionary game and friendship network, s preading of epidemic based on human and animal mobility pattern, complex network engineerings, and so on.

本届论坛文集共收编了32篇 ppt 报告，已经公布在中国科学网"复杂网络论坛圈"上（请看： hettp//www.sciencene.cn/g/ComplexNets 并且也发表在中国高等科学技术中心网站上（ the CCAST-WL Webside ）(请看： www.ccast.ac.cn/workshop )，这些报告内容丰富，各具特色，颇有创新，基本涵盖了近年来我国网络科学领域若干重要课题的研究进展和丰硕成果，课题研究颇有深度，不仅具有现实意义的重要课题（如甲型流感全球大爆发之经验统计及其传播模型），而且有前沿课题：生物神经网络系统的动力学与大脑网络，还有一系列重要课题：网络拓扑结构的动力学识别与估计、军事网络科学、网络科学在工程应用、多个体一致性、网络结构与动力学之间关系、同步-协同-中性稳定性和流型的稳定性、网络系统的协调动力学与控制、复杂网络的空间结构、连续系统和离散系统中的广义同步、疾病免疫算法、网络节点匹配、电力网、供应链网、化工网、通讯网与保密通信，等等。

Firstly, this paper puts forward an improved authentication and key distribution scheme for internet environment, in which we adhibit multilevel authentication center, encryption technology of DES, RSA and one-way function to actualize the safety of communication among the different user on network and reduces the workload of the authentication institution; at the same time, this scheme can also assure the security of network. Besides, it use the temporary symbol and the responds" sign of both-side correspondent to replace time stamp and applies them to internet communication to countercheck "rebroadcast attack and accordingly resolves the problem that it needs synchronization for network clock.

本文在首先提出一种改进的Internet网络环境下的认证及密钥分配方案，该方案考虑采用了多级认证中心，DES、RSA和单向函数加密机制，实现了网络上不同用户间的安全通信，降低了网上认证机构的工作量，同时也能够保证网络的安全性；并用通信双方的临时标志和响应者标识来代替时间戳应用于Internet通信中以防止&重播&攻击，从而解决了以往需要网络时钟同步这一难题。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。