通讯系统

These products are mainly used in civil mobile communication system , satellite communication system and wideband wireless receiving system.

该产品主要用于民用移动通讯系统，卫星通讯系统及宽带无线接入系统。

The comrade in arms record system is a communication system.

战友录系统是一个与通讯系统，通过使用网上战友录，他们可以和多年的战友通过留言平台来交流，就好比现在很流行的QQ或MSN等通讯系统。

In terms of memory hierarchy, we investigated how to improve the cache hit rate and localize data according to the characteristics of cache, master memory, local disk and remote disk in cluster systems. As for communication, features of cluster systems and different cluster internal networks are examined. Two popular parallel programming models - message passing model and share memory model - are analyzed in terms of how do they affect the cluster performance and how can we improve the cluster performance.

在处理器层面，分析了现代处理器中常用的一些技术，包括超线程技术、超长指令技术和NUMA架构等，对不同特点的程序的性能影响和如何充分利用处理器中的一些技术提升性能；在存储层次上，结合机群系统上Cache、主存、本地辅存及网络存储的存储层次的特点，分析了数据局部性、Cache命中率等对性能的影响以及提出如何提高数据局部性；通讯系统层面分析了不同机群通讯系统及不同机群通讯网络的特点；在编程模式方面，分析和比较了目前最常用两种并行编程模式--消息传递编程模式和共享存储编程模式，在机群系统上对性能的影响因子以及提出如何提高性能的方法。

The communication component try a new method, hide the complex of data transfer process, task management, communication management, data management, and implement the communication component in OOP, highlight on the atomic, support data continue transfer, data compress, decrease the press of network, so, the communication component is more duplicative, extend, flexible.

其中，网络通讯部件尝试从新的角度出发，封装了网络数据传输复杂过程为任务管理器，通讯管理器，数据管理器等三个部分，并以面向对象的设计方法实现该模块，重点突出了其事务原子性，增加断点续传能力，并支持数据压缩，减少网络负载，因此，该通讯系统具有良好的可复用性、可扩展性和灵活性。

Can be applied not only slow or intermittent communications system, also apply to uniform communication systems.

既可以适用较慢的或间歇通讯的系统，也可适用于匀速通讯系统。

We, furthermore, analyzed and designed the 3 chief systems of the direction system, that is Phonic Communication System, Video and Acoustic System and Network System.

文中对指挥中心的三大主要系统（语音通讯系统、视听系统、网络系统）的功能进行了介绍，同时对中央集中控制系统、音频扩声系统以及网络系统等的有关技术问题提出了建议。

SPWM full-bridge inverter and isolating transformer output makes UPS own superstrong load shock capacity as well as computers,network,military communication system,satellite communication system,high-grade medical equipment,precision instruments and equipment,monitor protection system,statellite communication system,fire fighting illumination system,financial securities network,broadcasting station sending and receiving system as well as jinformation transmission system.

适用于：计算机及网络系统、军用通讯系统、卫星通信系统、高级医疗设备、精密仪器设备、监控保安系统、消防照明系统、金融证券网络、电台发射及接收系统、信息传输系统等领域。

The system also provides better communication between the Fire Services Communication Centre and all fire appliances, fireboats and ambulances, thus improving operational efficiency.

新系统提供更多频道，并限制未经许可的使用者侵入通讯系统，令消防通讯中心与所有消防车、灭火轮及救护车之间有更佳的通讯效果，有助于改善行动效率。

EC 22. Lead as impurity in RIG Faraday rotators used for fibre optic communications systems.

在光纤通讯系统中的稀土铁石榴石法拉第旋转器中的杂质铅；在光纤通讯系统中的稀土铁石榴石法拉第旋转器中的杂质铅

In the last new years , as the demands of wireless communication system grows rapidly , the bands of microwave frequency had been saturated with various communication applications . To achieve wider spectrum for high-speed and high-capacity transmission , bands of millimeter-wave frequency are the solution of this problem . The advantage of MMW wireless communication systems is wider bandwidth comparing with microwave communication systems . To utilize the spectrum efficiently , many methods of complexly digital modulation is proposed . The more complex modulation , the higher linearity is required , and more various phase of signals are required to accomplish process of modulation . Therefore high-linearity and quadrature-phase modulator and demodulator are the emphasis of this thesis . For high level of integration , high performance and low cost , this chip is fabricated by the complementary oxide semi-conductor 0.13um process . A compact size of direct down-conversion and direct up conversion circuits will be presented in this thesis .

近年来随著无线通讯产业的蓬勃发展，微波频带已经趋近於饱和，为了追求更宽的频谱来达到更快传输速率及高资料容量的传输，宽频的毫米波频段提供了解决此问题的途径，毫米波无线通讯系统提供了相对於微波通讯系统宽频的优点，且为了更有效的使用频谱，各种不同且复杂的数位调变方式及方法被发表出来，越复杂的调变方式其所需的线性度越高，且需要更多不同的相位讯号来完成调变的过程，因此高线性度及四相位的调变及解调器将是此篇论文的研究重点，为了达到高整合性，高效能，及低成本的电路设计，我门利用互补式金氧半导体制程来完成此电路设计，因此一小面积的直接降频(Direct down-conversion)及直接升频(direct up-conversion)电路将在文中介绍。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。