关于TCAP功能分析和实现技术研究

文章首先对ＴＣＡＰ的事务子层和组元子层的功能进行了分析，然后举例说明ＴＣＡＰ在智能网中的应用。在此基础上阐述了ＴＣＡＰ的实现技术，提出了采用有限状态机（ＦＳＭ）的结构实现ＴＣＡＰ各功能的设计思想。对于并发进程采用消息（ＭＳＧ）驱动和激活，配合每个事务的ＦＳＭ状态表实现多事务的并发处理。对ＴＣＡＰ的操作时延要求，在软件设计中采用了“时间陷阱”的方法。     

PFC与PWM控制器二合一芯片ML4819及其应用

ＭＬ４８１９是ＰＦＣ与ＰＷＭ控制二合一ＩＣ。其中的ＰＦＣ电路同ＭＬ４８１２类似，ＰＷＭ采用电流或电压模式控制，并且ＰＦＣ电路和ＰＷＭ共用一个振荡器，使用简单、灵活、功能强。本文简要介绍了该混合型ＩＣ的功能、工作原理，重点剖析了用ＭＬ４８１９组成的开关电源的工作原理。     

DSM—CC及在DAVIC规范中的应用

ＤＳＭ－ＣＣ是ＭＰＥＧ－２标准的一个组成部分，是为了控制和管理ＭＰＥＧ－１和ＭＰＥＧ－２比特流而定义的一个协议集。ＤＳＭ－ＣＣ由网络会晤和资源控制、客户设置、客户下载、视频流的ＶＣＲ控制、通用交互式应用服务和通用广播应用服务组成。ＤＳＭ－ＣＣ非常灵活，可用于各种传输层协议之上。也可以用于各种网络中。ＤＳＭ－ＣＣ的每个协议既可以单独使用，也可以与其他协议一起使用，现已有许多组织采用该协议集。本文首先     

MC68300系列微控制器的特点和应用

ＭＣ６８３００系列微控制器的特点 Ｍｏｔｏｒｏｌａ公司的ＭＣ６８３００系列微控制器采用模块化设计，可以根据用户的要求，选择不同的模块，以适应不同的应用场合。现在广泛使用的己有十余种产品，其组成如图１所示。 它们具有以下共同的特点／模块： （１）中央处理单元（ＣＰＵ）采用在ＭＣ６８０２０基础上形成的３２位ＣＰＵ，称作ＣＰＵ３２。它与ＭＣ６８０２０的指令系统基本相同，并且还增加了多条适合于微控制器应用的指令，这样，在开发过程中就可以充分利用已有的成果。最高工作频率己达２５Ｍｚ。 （２）由于采用了全静态设…     

一种高性能2.0umBiCMOS工艺

本文介绍一种高性能２．０ｕｍＢｉＣＭＯＳ工艺。该工艺采用Ｐ型衬底Ｎ型Ｐ型双埋层，Ｎ型薄外延结构，掺杂多晶作为ＣＭＯＳ晶体管栅杉双极晶体管的发射极。ＣＭＯＳ晶体管源漏自对准结构，钛和铝双层金属作为元件互连和ＰＥＣＶＤ ＳｉＮｘ介质作为钝化薄膜。     

MMX技术简介

ＭＭＸ技术简介高路９９７年初Ｉｎｔｅｌ推出了采用多媒体扩展（ＭＭＸ）技术的奔腾处理器，命名为Ｐ５５Ｃ，最低时钟频率高达２００ＭＨｚ，高速缓存增加了一倍，４５０万个晶体管全部封装在１４１ｍｍ２的芯片中。由于结构和生产工艺的变化，ＭＭＸＣＰＵ不但具有更快...     

亚太地区蜂窝区移动电话用户数一览表

采用协议业务开始时间蜂窝区网络数量用户数普及率(%)香港(中国)ＴＡＣＳ,ＧＳＭ,ＣＤＭＡ,ＡＭＰＳ1984　　　　72086000　　33.8澳大利亚ＡＭＰＳ,ＧＳＭ19934497500027.5新加坡ＡＭＰＳ,ＴＡＣＳ,ＧＳＭ,ＤＣＳ1988274300025.8日　本ＰＤＣ,ＴＡＣＳ197992874400022.7新西兰ＡＭＰＳ,ＧＳＭ1987256750015.9韩　国ＣＤＭＡ,ＡＭＰＳ19843680000015.1马来西亚ＡＭＰＳ,ＮＭＴ,ＴＡＣＳ,ＧＳＭ,ＤＣＳ19858210000010.9台湾(中国)ＡＭＰＳ,ＧＳＭ1989216900007.9泰　国ＮＭＴ,ＡＭＰＳ,ＤＣＳ,ＧＳＭ1985819500003.3菲律宾ＡＭＰＳ,ＧＳＭ,Ｔ…     

实时日历时钟芯片MC146818在Z80系统中的应用

文章介绍一种方法，将采用ＭＯＴＥＬ技术研制的实时日历时钟芯片ＭＣ１４６８１８应用于Ｚ８０微机系统，文中给出了Ｚ８０ＣＰＵ与ＭＣ１４６８１８的接口硬件和软件。     

用于小节距CRTs的微晶荧光粉

我们已经为小节距ＣＲＴｓ开发出了称为微晶荧光粉（简称ＭＣＰ）的小粒度高效荧光粉。ＭＣＰ具有极好的涂敷特性，它的采用已经提高了制造ＣＲＴｓ的生产率。     

MC对光动力学疗法中大肠癌细胞周期的影响

本文研究的目的为探讨ＭＣ在大肠癌ＰＤＴ增效作用中对癌细胞周期。ＤＮＡ含量的影响。方法在为癌细胞培养的基础上，用超低浓度的ＭＣ增效；ＰＤＴ后采用流式细胞技术，对癌细胞的周期和ＤＮＡ含量进行分析，数据经ＳＰＬＭ软件包处理。其结果是ＭＣ可使ＳＷ４８０细胞ＧＩ期细胞百分比显著增高；Ｓ期细胞、ＰＩ指数显著降低；ＰＤＴ后，ＰＳＤ＋ＭＣ组各期细胞与对照比细胞百分比无显著变化，与ＰＳＤ组比，ＧＩ期细胞明显升高，Ｇ     

Direct G/T Measurement for Satellite Broadcasting Receivers

A new G/T measurement method for receivers which are used for direct broadcasting from a satellite is proposed. By this method, G/T can be obtained without measuring G and T values separately. Therefore, this method, which can be called a direct method, can be adopted for the G/T measurement for integrated antennas, wherein an antenna and a receiver are unseparably combined, while the conventional method can not be adopted nder these circumstances. Besides,-o special test equipment is required for this method. This method can achieve more accurate G/T data because the result is independent from noise bandwidth or signal time response of test equipments. This paper describes the principle of the method, practical test procedure and some notes on how to avoid measurement errors. Some experimental results are also presented, which show that G/T values determined by this method agree with those obtained by the conventional method within 0.4 dB.     

区域性中轨道卫星移动通信系统“时间决定”星座设计

区域性卫星移动通信系统对于发展中国家具有十分重要的意义,特别是对于中国这样幅员辽阔且在广大农村地区缺乏基本通信手段的国家.采用中轨星座是解决这一问题的有效途径.本文提出了一种用于区域性系统的中轨星座设计方法:"时间决定"星座设计.该星座可为特定地区提供性能优越的服务,它提供的服务可以是时限的,也可以是非时限的.利用这种设计方法可以为中国设计经济的卫星移动通信系统星座方案,同时这些星座方案也可为美国大陆提供优越的服务.     

基于多核支持向量机的火灾烟气检测算法研究

火灾烟气中气体和烟雾浓度测量对火灾研究有着重要意义。文中提出一种利用多传感器技术同时在线测量各种有害气体浓度,然后将多个测量结果作为特征向量,利用上位机的模式识别算法进行判别的方案。上位机对多传感器同时探测到的数据进行智能化处理,可有效抑制线性方法的过拟合问题,提高数据泛化能力,减小预测结果对于噪声的敏感度,从而提高预测的效率和精度。基于不同气体的测量值的重要程度不同,文中提出了利用多核支持向量机对特征进行分类的设计实现方法。实验表明,文中提出的气体数据后处理方案可以有效地对火灾进行预警。     

傍轴光束传输的统计行为

对一个任意的傍轴光束，只要给定了任一起始截面上的光场分布情况，则其在自由空间中传输的统计行为就可完全确定了，而且可用“等效高斯光束”来进行描述。给出了相应的传输参数，它们完全确定于起始截面的光场分布情况。利用“嵌入高斯光束”的概念将文献［５］中的结果推广到更为普遍的情形。     

A new lumped-elements power-combining amplifier based on anextended resonance technique

A technique for combining power FETs in the output stage of a power amplifier is presented. The active devices are combined with simple inductor/capacitor networks and can be laid out across a single die while still allowing each device to be independently accessed for biasing. The inductors can range from fully integrated spirals to simple wire bonds, making this technique applicable over a broad range of frequencies. For linear RF power applications this is an effective technique for spreading more heat, while at high frequencies the junction parasitics are easily absorbed into this type of design. DC losses are minimized since each device can be biased individually, furthermore, it is possible to adjust the bias separately for each device to account for device nonuniformity across the die     

手持设备中股票软件数据存储方案的设计

针对股票软件中历史数据的特点.深入分析了B+树存储和线性表存储两种数据存储方案.这两种方案均能达到股票软件的应用要求,最后进一步从性能和资源耗费上对这两种方案进行了对比分析,指出了它们各自的优点与不足,对其他类似的设计具有很好的借鉴意义.     

On Undulator Radiation in Infrared and Millimeter Wave Ranges: Part 1—Classical Description

In this paper the results of theoretical and experimental research of the motion and radiation of low-voltage electron beams in Motz undulator are given. Constant magnetic field of undulator ordinary magnet under some conditions can be substituted for field of magnet dipole. Such substitution allows us to accurately integrate the electron trajectory. We can with the high accuracy consider this field as chaotic and this fact allow us to use well-known Ginsburg theory for estimation of power of braking radiation. There are longitudinal and transversal components of magnetic fields of described structure. The longitudinal component can be gained by covering of external longitudinal constant magnetic field. In this connection certain resonance effects are observed.     

弹性分组环保护倒换策略的研究

保护倒换是弹性分组环中的一项关键技术,目前IEEE802.17草案中的保护倒换策略只能够提供小于50ms 的保护倒换时间,但却无法在保护倒换发生后保证实时业务的服务质量。为解决此问题,针对RPR MAC层的两种结构模式单队列和双队列模式,我们制定了两种不同的保护倒换策略并对它们进行了性能分析。仿真结果表明, 这些策略能在保护倒换发生后很好地确保实时业务的服务质量。     

On Enhancing SIMD-controlled DSPs for Performing Recursive Filtering

Many digital signal processors (DSPs) and also microprocessors are employing the single-instruction multiple-data (SIMD) paradigm for controlling their data paths. Although the SIMD paradigm can provide high computational power and efficiency, not all applications can profit from this feature. One important application, particularly in audio processing, of DSPs are recursive (IIR) filters. Due to their data-dependencies they can not exploit the capabilities of SIMD-controlled DSPs as non-recursive (FIR) filters can. This paper shows, how the SIMD control scheme can be enhanced to accommodate recursive filters without introducing much hardware overhead. Three methods for calculating recursive filters on SIMD-controlled DSPs and their requirements for control and data transfer are presented. They can be applied to direct-form as well as cascade-form realizations. The performance and hardware requirements of these methods are evaluated to determine the most efficient solution in terms of the AT-product. An erratum to this article is available at .     

Multiagent technology for fault tolerance and flexible control

One of the main characteristics of multiagent systems (MAS) is fault tolerance. When an agent is unavailable for some reason, another agent with similar capabilities can theoretically compensate for this loss. The system can be designed not only for this kind of fault tolerance but also for others. Many key aspects of fault tolerance in MAS are described in this correspondence including social knowledge and physical distribution. We present a MAS framework that has been designed for control applications, in which fault tolerance and flexibility are key parts of the system.