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A narrowband interference has a greater power spectral density. Thus it will bring more strong devastation to the DSSS system than a broadband one does.So it is difficult for DSSS system to ensure a high quality of communication by itself when strong interference exists, even communication may be intermitted.

窄带干扰(Narrow-Band Interference,NBI)由于其功率谱密度比宽带干扰高得多,所以它对DSSS系统的破坏性更强,当有强窄带干扰存在时仅靠系统自身的抗干扰能力很难保证系统高质量的通信,甚至可能造成系统通信中断。

Firstly, the basic concept of software/hardware co-design and the present research situation worldwide is introduced, the techniques are also discussed separately in the thesis, which is in the system description stage, system architecture design stage, hardware/software design and implementation stage. Secondly, combined with three representative methods of hardware/software co-design systems: POLIS、VULCAN and CORSAIR, the main steps of co-design are studied and analyzed including system description, hardware/software partitioning and hardware/software implementation-synthesis, and some new ideas are given here. Thirdly, UML and modeling technology of embedded systems using UML are described clearly, a handheld terminals is a good example for this, furthermore, the algorithm of how to convert the UML diagram into SystemC codes is mainly concerned on in this thesis. Fourthly, the basic concept of SystemC is described, and the SystemC Modeling platform and simulation mechanism are analyzed, software/hardware co-design methods using SystemC are discussed. Finally, by applying co-design ideas using UML and SystemC, software/hardware co-design system using UML and SystemC is preparatorily implemented, which is to establish a development environment for designing embedded system.

本文首先介绍了软硬件协同设计的基本概念和国内外研究现状,并分别论述了系统描述阶段的技术、系统结构设计阶段的技术、软硬件设计与实现阶段的技术;接着结合POLIS、VULCAN和CORSAIR 三种有代表性的软硬件协同设计方法,对系统描述、软硬件划分、软硬件实现综合等几个主要设计步骤进行了研究与分析,并提出了新的方法和思路;然后详细介绍了UML及基于UML的嵌入式系统建模技术,并以嵌入式手持终端系统来举例说明,重点研究将UML的视图转换成SystemC代码的算法;其次介绍了SystemC的基本概念,分析了SystemC 的建模平台和仿真机制,并对基于SystemC 的软硬件协同设计方法进行探讨;最后应用基于UML和SystemC的软硬件协同设计的设计思路,初步实现基于UML和SystemC的软硬件协同设计的设计系统,目的是建立一个用于嵌入式系统设计的开发环境。

Moreover, after being followed up for 3 years, 49 patients who received regular SIT have less possibility to suffer from asthma than those of 23 cases patients who had irregular SIT, and the difference between them was statistically significant (P.01). For AR patients complicating with asthma, their asthmatic symptoms and physical signs had been improved after SIT. It was increasingly reduced for the level of TIgE, SIgE, and ECP in serum of AR patients after SIT.

此外,观察期满3年的49例接受系统免疫治疗的患者与未系统治疗患者23例发现,前者继发哮喘的几率低于后者,两者比较差异有统计学意义(P.01);对合并有哮喘的AR患者经SIT后,哮喘症状体征有改善;患者血清TIgE、SIgE和ECP在SIT治疗后水平逐渐降低。

The relationship between the tracking error and those auxiliary errors is clearly established when plant relative degree is greater than one and therefore, it can be proved that the influence of averaging filters on a VS-MRAC system can be considered as, in a sense, an unmodelled dynamics. As a result of this, it is shown that the stability analysis of a signal synthesis based VS-MRAC system must be modified to include the 'unmodelled dynamics'.

当对象建模部分相对阶大于1时,得到了系统跟踪误差和辅助误差间明确的关系表达式,进而证明平均值滤波器对系统的影响相当于未建模动态对系统的影响,这表明以往相关文献关于系统稳定性的分析是有缺陷的,没有将平均值滤波器对系统稳定性的影响完全考虑在内; 3。

What should be pointed out is that if the suggestions are used on the basis of the current system, it may be of no apparent effect, and if they are used in a new information system building,we can get great achievements.

值得注意的是,这些改进意见如果仅用于改造目前这一现存系统的话,会有一定成效,但成效可能并不明显,但如果用于三医院下一阶段进行全新系统建设会有莫大的帮助。

We utilize the same restocking , EDI bar code, inventory management, customer record and bookkeeping system.

它们有相同的补货系统、相同的EDI 条形码系统、相同的库存管理系统、相同的会员管理系统、相同的收银系统。

It syncretizes the excellency of early OO modeling method and language, and is a rich, precise and extensible modeling language for system development. Therefore, UML is used used in the whole course of software development.

因此,本文将UML应用于系统开发的整个进程中,通过其提供的多种视图从不同角度表现系统的静态和动态特征,完成系统的设计和实现,从而对整个系统有清晰的认识,并为最终的系统提供了相关的细节文档资料。

The system of drive are all driven by stepping motors.the machine system design includes every free degrees,computation of drive and transmission system .the third and four degree of freedom are performed by the feed screw having the spline of ball bearing which is design specially for robot .with the textual study,it can be believe the user will have an overall understanding to the way of thinking and steps of the machine system.

在机械系统设计上,对每个自由度驱动、传动系统进行了计算与校核,其中第三四自由度有专为机器人设计的带滚珠花键的丝杠来实现。通过本文的学习,相信使用者会对它的机械系统设计的步骤和方法有一定的了解。

From the experiment and analysis, it can be seen that friction limits realization of high accuracy electro-hydraulic position servo system, movement of any gimbal brings disturbance moment to servo system of other gimbals and the disturbance moment causes error, and, resolution ratio error and setting error of feedback measurement element are directly added to servo system output.

通过实验和仿真可以看出,摩擦阻碍了转台电液位置伺服系统商精度控制的实现,任何一个框架的运动都会对其余框架的伺服驱动系统产生干扰力矩并引起伺服系统误差,反馈测量元件的分辨率误差和安装误差直接反映在伺服系统输出上,对伺服系统的精度有直接影响。

The system is mainly used for 140 horizontal continuous casting machine power plant, control of the working point tank movements, As the system configuration on a level of temperature, pressure relay (HED10A20), the solenoid valve, valve, safety valve, and so can the system oil temperature, pressure and other remote control and compact design of the structure, convenient operation and reliable performance, energy conservation is SLD-140 horizontal continuous casting machine hydraulic devices supporting the ideals of hydraulic equipment.

该系统主要用于140水平连铸机的动力装置,控制各工作点油缸动作,由于该系统配置有液位液温器、压力继电器(HED10A20)、电磁阀、溢流阀、安全阀等,因此可对系统的油液温度、系统压力等实现远程监控,其结构设计紧凑、操作方便、性能可靠、节约能源是SLD-140水平连铸机液力装置的理想配套液压设备。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。