通信的

For example,the maintenance of multiple networks can require additional staff.often,this staff must be trained on multiple vendor technologies,sometimes requiring parallel groups specializing in each （72） hence,additional maintenance procedures must be maintained and administrative records are （73） the duplication of trasport facilities to carry （74） network traffic is an inefficient use of resources and,not surprisingly,more technologies installed in a central office mean the necessity for more physical space,and an increase in power connections and power consumption.migration of these （75） network elements to IP-based DCns is alogical strategy

例如，维护多个网络需要增加工作人员。通常这些人员必须培训，以便熟悉多种制造商技术，同时还需要熟悉不同平台的许多工作小组。因此，额外增加的维护过程使得各种管理记录激增。承载着不同网络通信的多种传输设施造成了资源的无效使用。很自然的推论就是，更多的技术装置配备在交换局中意味着需要更大的物理空间，增加了动力设备和电源消耗。这些遗产网络元素逐步迁移到基于IP的DCN是符合逻辑的策略。

Through a study of the cases of transit signaling system improvement in the world, this paper introduces the development of CBTC-MB, which is compared with the traditional Fixed Block, the principle, the functional block diagram and the technical standard of CBTC-MB, holds that this technology will be further developed and applied in urban mass transit.

通过国际上城市轨道交通列车控制系统发行的案例，介绍了移动闭塞在国际上的发展概况。比较了基於通信的列车控制的移动闭塞列车控制方式和传统闭塞方式之间的不同。介绍了移动闭塞的工作原理、组成及相关的技术标准。指出移动闭塞和CBTC必将在城市轨道交通中得到发展和应用。

One of the ways to solve the problem above is actualizing the digital corresponding, transforming the image to the digital signals, wiping off the redundancy outlying of the image quality. Furthermore, on the precondition of ensuring the quality, storaging, recording and transmitting the digital signals is oecumenical, credible and all wool and a yard wide using least bits or bits ratio.

解决这个问题的途径之一，是实现图像通信的数字化，把图像信息转换成数字信号，去除与图像质量无关的冗余信息，并且在保证质量的前提下，用最少量的数码或数码率，实现各类图像的数字存储、数字记录或数字传输，达到优质、可靠、经济的要求。

Secondly, by establishing a discrete time Markov model with spatial reuse for a MANET, we analyze the performance of the network under the AODV routing protocol. The average route length and the probability to communicate within a limited hop distance are obtained. Several performance parameters of the route discovery and route maintain process are analytically studied, such as the probability generating function and the expectation of the flooding distabce. the probability that a route is discovered by a query packet with a "hop limit", the probability that a request packet finds a valid route, the average time needed to discover a valid route and the cost to successfully route a data packet to its destination. Furthermore, we present a concrete example based on the transmitter characteristic of directional antennas and obtain the corresponding results.

建立了移动自组网络空间可重用的离散时间马氏链模型，得到了AODV路由协议下网络任意两节点间的平均路由长度、在指定"跳限"要求下通信的概率；对随选型路由协议下路由发现和路由维护过程中若干网络性能参数进行了解析分析，如网络中任意两节点问的泛洪距离的概率母函数及其期望、限定泛洪步数时成功寻路的概率、发现一条有效路由的平均时间、成功路由的代价等；并基于定向天线的发射特征给出了一个具体实例，分析计算了相应的网络性能参数。

This invention puts forward a method for monitoring the different frequency local area signal quality by a tracking measurement way combining periodical measurement and all event trigger measurement, either reducing different frequency measurement times in a unit interval or ensuring performance of the system.

为了更好的适应第三代移动通信的要求，本发明提出一种通过周期性测量和事件触发测量相结合的跟踪测量方式来达到监测异频小区信号质量的方法。该发明的使用既减少单位时间内异频测量的次数，同时又确保了系统的性能。

Constructed of aircraft-quality carbon fiber from stem to stern, the Devon GTX instantly communicates its ultra-performance capability through aggressive, compact proportions and large (up to 20-inch) lattice-structure center-lock wheels.

飞机建造优质的干碳纤维到船尾，在英国德文郡GTX的即时通信的超高性能，通过积极的，紧凑的比例和大型（20英寸）的晶格结构中心的能力锁车轮。

After the direct communication is established, the network system monitors continuously the communication signal between these two mobile terminals for receiving outburst, demodulates outburst to determine whether the outburst contains the control information for the network system, and execute corresponding function if the outburst contains.

网络系统对接收到的在两个移动终端之间通信的突发进行解调，以确定接收到的突发是否包含欲用于网络系统的控制信息。如果在接收到的突发中包含欲用于网络系统的控制信息，网络系统将执行相应的功能。

Due to the carrier communication of the power line,leakage radio communication,induction communication and other the radio mobile communication technologies existing many problems,they are all not applied to mine.

由于动力线载波通信、漏泄无线通信和感应通信等无线移动通信技术存在问题较多，没有在矿山普及。为了实现矿区地面与矿山井下之间的无线通信，研究了小灵通、大灵通和第三代移动通信技术(3G)等在矿山无线移动通信中的应用。

The stickiest issue is building a directory of digital certificates.this directory holds the certificates needed to encrypt messages to a recipient.internally,building the directory may not be a big deal because all certificates for a company can be published in a central lightweight directory access protocol server,but externally this causes many problems.you will need to establish an agreement with a recipient's organization to ensure access to the right digital certificates.this process, however, creates more user training issues and adds complexity to e-mail communications.

最困难的问题是建立数字证书目录。此目录保存着向一名接收人发的信息进行加密所需的证书。从内部讲，建目录可能不是件大事，因为一家公司的所有证书可以由中央简化目录访问协议服务器颁发，但从外部讲，这会引起很多问题。你需要与收件人所在组织达成协议，以确保访问正确的数字证书。然而，这个过程会造成更多的用户培训问题以及增加电子邮件通信的复杂性。

The system includes a plane-carried communication subsystem, a satellite communication subsystem, and a ground communication subsystem, wherein, the ground communication subsystem includes a first communication terminal, a second communication terminal, and a ground communication network. The ground communication subsystem also includes an incoming transfer subsystem. The first communication terminal's calling to the second communication terminal is transferred to the corresponding fixed satellite communication terminal through the ground communication network, the satellite communication terminal, and plane-carried communication subsystem according to the correspondence of incoming call transfer.

本发明系统包括机载通信子系统、卫星通信子系统和地面通信子系统，其中，所述地面通信子系统包括第一通信终端、第二通信终端、地面通信网，所述地面通信子系统还包括来电转接子系统，所述地面通信子系统中第一通信终端向第二通信终端的呼叫按照来电转接对应关系依次通过地面通信网、卫星通信子系统、机载通信系统子系统转接到对应的固定卫星通信终端。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。