安全通信

The invention solves the problem of accessing to network by using infrared or low power laser light communication in subrange, especially aims at multi users on-line by optical signal in room place and being liable to interference with WLAN build with conventional air wave transmission. The optical accessing LAN consists of an accessing point and multi users devices.

本发明涉及局域网通信技术领域，公开了一种光接入局域网系统，能够解决局部范围内以红外线或低功率激光的光通讯方式上网的问题，特别是针对室内空间多用户以光信号传输方式上网的情况，以及解决以传统无线电波传输方式组建WLAN的易受干扰信息安全问题。

Based on its safe, stable and highly efficient voice and data traffic, TETRA digital trunked system is broadly applied in world wide.

TETRA数字集群系统提供安全、可靠以及高效率的语音和数据通信，在全球范围得到了广泛应用。

Block ciphers have been extensively applied in computer communication and the safety field of information systems.

分组密码在计算机通信和信息系统安全领域有着最广泛的应用。

According to the demanding of network support system in the domain of industrial control, and referring to the design principle of commercial Ethernet, this paper designs structure of industrial Ethernet which is based on delaminated structure and afford a communication platform which is secure and stabile and mutual operation for industrial control system, at the same time designs a remote monitor system of industrial Ethernet which is based on Internet.

根据工业控制领域对网络支持系统的要求，借鉴商业以太网的设计原则和方法，设计了基于分层结构化工业以太网结构，拟为工业控制系统提供了一个安全、稳定、互操作性好的通信平台；同时，按照该设计思路和原则，本课题设计了一个基于Internet的工业以太网远程监控系统。

Uses the automated control not only on the galvanization production line to be possible to raise the product manufacturing efficiency and to reduce worker's labor intensity, and has the very good economic efficiency and the social efficiency, galvanizes on the production line to be possible to realize the automated control using PLC, PLC has the reliability to be high, the compatibility is broad, has the correspondence function, the structure modulation characteristic, therefore how to use good PLC to become the galvanization production line automation control key, auxiliary to galvanized the automatic production line driving with PLC by the frequency changer to carry on the automatic control, had the structure to be simple, the programming was convenient, the operation was flexible, the use safe, worked stable, the perform reliably and the antijamming ability strong characteristic, was one kind of very effective automatic controlThe way, is galvanizes the production to realize, the low cost, the high grade automated production development direction highly effective.

在电镀生产线上采用自动化控制不但可以提高产品生产效率和减轻工人的劳动强度，而且有着非常好的经济效益和社会效益，电镀生产线上运用PLC则可以实现自动化控制，PLC具有可靠性高，适应性广，具有通信功能，结构模块化的特点，因此如何使用好PLC成了电镀生产线自动化控制的关键，用PLC辅以变频器对电镀自动生产线行车进行自动控制，具有结构简单、编程方便、操作灵活、使用安全、工作稳定、性能可靠和抗干扰能力强的特点，是一种很有效的自动控制方式，是电镀生产实现高效、低成本、高质量自动化生产的发展方向。

This theme prominently analyzes development and history of VDR, discusses the unique functions in accident investigation, probes into functional effects of VDR in various marine accident and functions of safe management of VDR, indemnity due to insurance policy as well as trial of navigating for ships, and looks forward relationships among VDR, ECDIS, AIS and prognosticates VDR effects combined with future communication technique.

同时，对不同事故性质对VDR作用的影响和VDR在安全管理、保险理赔、船舶试航等多方面能够起到的作用进行了探讨，并就VDR与ECDIS、AIS的关系和未来通信技术的发展对VDR的影响作了展望。

When the basic telecommunication network in a handful of regions is yet to be set up, some areas have frequently sounded the alarm of information insecurity. Hackers are not brought to justice while countries recriminating each other.

当少数地区基本通信尚未实现，其他地区却频频拉响信息安全警报，黑客逍遥法外，国家间相互指责。

When the basic telecommunication network in ahandful of regions is yet to be set up, some areas have frequentlysounded the alarm of information insecurity. Hackers are not brought tojustice while countries recriminating each other.

当少数地区基本通信尚未实现，其他地区却频频拉响信息安全警报，黑客逍遥法外，国家间相互指责。

Key words: network security; Peer-to-Peer networks; anonymous communication; rerouting

关 键 词：网络安全；P2P网络；匿名通信；重路由

To ensure the train traffics safety, the GSM-R communication system must be with reliable network quality.

为保证列车的行车安全，需要GSM-R通信系统具有可靠的网络质量。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。