光缆线路自动监测系统的探讨

本文在叙述了建立光缆线路自动监测系统的必要性后，介绍了国内外已经使用和正在准备使用的两各光缆线路自动监测系统，供光缆线路维护部门在选择自动监测系统的方案时作为参考。     

浅谈自动转报在民航体系中的实现与应用

自动转报网络系统在民航系统中作为基础性的通讯设施而存在。在民用航空系统中，自动转报网络系统的配备，是保障民用航空系统在飞行中，保持正常与安全作业的必不可少的手段。自动转报网络系统的使用，不仅为民用航空在运输服务、机场服务中，还是空中管理业务中，都起到了很好地安全保障作用。那么，自动转报网络系统在民用航空中到底发挥了哪些具体作用？本文主要针对自动转报网络系统，在我国民航中的应用情况进行研究。     

实时多任务操作系统CMX在自动摊铺机系统中的应用

本文描述了自动摊铺机控制系统的原理和结构，并在此基础上详细介绍了实时多任务操作系统CMX在自动摊铺机系统中的应用，包括CMX系统简介、系统主要函数、主控制器C164CI、自动摊铺机系统任务划分和部分程序设计。     

箔条诱饵对雷达距离自动跟踪系统干扰过程的分析

本文简述了雷达距离自动跟踪系统的工作原理。通过分析该系统在箔条诱饵的干扰作用下，由自动跟踪载机变化到跟踪箔条诱饵的工作过程，阐述了箔条诱饵对雷达距离自动跟踪系统的干扰原理。     

有线电视干线自动电平调节系统

本文从自动电平调节系统的成入手，较详细地分析了各种调节方式的性能，指出了自动电平调节系统的三大功能。同时介绍了系统的调整、测量方法。最后提出了在自动电平调节系统中采用数字技术的设想。     

省公共频道插播系统选择与构建

本文比较了截播系统、带基自动播出系统、盘基自动插播系统、带基手动插播系统、带基自动插播系统等可供选择用作省公共频道插播系统的多种技术方案，重点对基于改造现有空闲系统设备，设计与构建带基自动插播系统的情况进行详细分析与介绍。     

战术导弹红外成象导引头搜索系统设计(二)

介绍战术导弹同轴安装式红成象导引头自动搜索系统的原理与组成，提出了一种用单片机系统实现自动捷索系统的方案，并对该自动搜索系统进行了概略分析。最后探讨了探讨了搜索系统特性对目标自动截获的影响和实现目标自动截获的技术途径。     

新品推荐——软件工具类

BPM Helix自动烧录系统，KIC Explorer热温度曲线系统，LeadTracer—RoHS XRF系统，SMT3000LD自动去助焊剂系统     

小容量无线自动寻呼装置

１０００门以下的小容量无线寻呼系统在各专业寻呼网中较为多见，这类寻呼系统多为话务人工操作，欲改为人工，自动兼容的寻呼系统又不想投入较大的资金，配备本文介绍的小容量无线自动寻呼装置可十分经济方便地将人工操作寻呼系统改为人工、自动兼容的寻呼系统，可使服务质量和水平上一个台阶。     

战术导弹红外成象导引头搜索系统设计(一)

介绍占术导弹同轴安装式红外导引头搜索系统的原理与组成，提出了一种用单片机系统实现自动搜索系统的方案并对该自动搜索系统进行了概略分析，最后探讨了搜索系统特性对目标自动截获的影响和实现目标自动截获的技术途径。     

Polyelectrolytes-coated gold nanoparticles detection by PEDOT:PSS electrochemical transistors

Electrochemical transistors made of PEDOT:PSS are used to detect different polymeric shells used to functionalize the nanoparticles for drug delivering. The devices were realized drawing their configuration directly on glass with a micro-syringe and micro-positioning system. This permits a great flexibility in the definition of the needed geometry giving the possibility to maximize the signal to the different polymeric shells. The realized devices exhibit different responses respect to the functionalized nanoparticles and in particular respect to the polymer used for their functionalization. The linear behavior observed gives the possibility to use these devices to detect the quantity of polymer loaded on the nanoparticles. This opens to the possibility to determine the quantity of drugs that could be loaded inside the functionalized shells and also to detect the kinetics of drug delivery or, even, to monitor the stability of the nanoparticles themselves.     

基于ADO．NET构建数据库访问中间层类库的研究

为了使数据设计和程序开发完全分离,减少二者间耦合,达到项目便于分割,任务便于独立,提高效率,减少错误的目的。采用构建数据库访问类库的方法。本方法已在理论考核系统、远程辅助教学系统等多个系统中做了实验,并验证了其效果的良好性。得到了一个结论,有了这样一个中间层,项目主程序的开发者,可以完全不需要了解数据的细节,只需要构建这个类库的对象,通过对这些对象的读写操作,就可以完成对数据库的操作。     

浅析卷烟准时配送的实现

在卷烟制造企业的产品销售中,能否准时地将卷烟配送到商业客户的手中,提高配送效率,是新常态下服务满意度提升的一个重要条件。那么在网络和信息系统发达的今天,传统的企业必须与互联网拥抱在一起,寻求效率和满意度提升新途径。立足于固有的资源,为实现客户满意度提升和客户订货需求的增加,如果仅仅采用企业原有知识和技能框架是不足以满足要求的。我们要了解的是什么使客户能够创造出核心的价值得以实现业务的增值。由于小批量多批次订货模式的改变,如何保证产品准时到货,如何利用互联网及信息系统为客户提供可感知的便利操作。本文对卷烟如何实现准时配送的问题进行一个浅析。     

Distributed code assignments for CDMA packet radio networks

Code-division multi-access (CDMA) techniques allow many users to transmit simultaneously in the same band without substantial interference by using approximately orthogonal (low cross-correlation) spread-spectrum waveforms. Two-phase algorithms have been devised to assign and reassign spread-spectrum codes to transmitters, to receivers and to pairs of stations in a large dynamic packet radio network in polynomial times. The purpose of the code assignments is to spatially reuse spreading codes to reduce the possibility of packet collisions and to react dynamically to topological changes. These two-phase algorithms minimize the time complexity in the first phase and minimize the number of control packets needed to be exchanged in the second phase. Therefore, they can start the network operation in a short time, then switch to the second phase with the goal of adapting to topological changes. A pairwise code-assignment scheme is proposed to assign codes to edges. Simulations based on well-controlled topologies (sparse topologies) show that the scheme requires much fewer codes than transmitter-based code assignment, while maintaining similar throughput performance     

基于分区的代码覆盖率工具的研究与设计

随着嵌入式软件的规模和复杂性不断提高,白盒测试中经常用到覆盖率测试。轻量级覆盖率测试工具GCOV在使用上具有操作繁琐的弊端。本文基于GCOV覆盖率测试的原理,依据shell脚本批处理的特点将各部分操作封装为脚本工具,实现各脚本工具调用。通过该设计进行覆盖率报告输出节省了大量时间,提高了软件开发测试的效率。     

Dynamic spectrum sharing in cognitive radio networks using truthful mechanisms and virtual currency

In cognitive radio networks, there are scenarios where secondary users (SUs) utilize opportunistically the spectrum originally allocated to primary users (PUs). The spectrum resources available to SUs fluctuates over time due to PUs activity, SUs mobility and competition between SUs. In order to utilize these resources efficiently spectrum sharing techniques need to be implemented. In this paper we present an approach based on game-theoretical mechanism design for dynamic spectrum sharing. Each time a channel is not been used by any PU, it is allocated to SUs by a central spectrum manager based on the valuations of the channel reported by all SUs willing to use it. When an SU detects a free channel, it estimates its capacity according to local information and sends the valuation of it to the spectrum manager. The manager calculates a conflict-free allocation by implementing a truthful mechanism. The SUs have to pay for the allocation an amount which depends on the set of valuations. The objective is not to trade with the spectrum, but to share it according to certain criteria. For this, a virtual currency is defined and therefore monetary payments are not necessary. The spectrum manager records the credit of each SU and redistributes the payments to them after each spectrum allocation. The mechanism restricts the chances of each SU to be granted the channel depending on its credit availability. This credit restriction provides an incentive to SUs to behave as benefit maximizers. If the mechanism is truthful, their best strategy is to communicate the true valuation of the channel to the manager, what makes possible to implement the desired spectrum sharing criteria. We propose and evaluate an implementation of this idea by using two simple mechanisms which are proved to be truthful, and that are tractable and approximately efficient. We show the flexibility of these approach by illustrating how these mechanisms can be modified to achieve different sharing objectives which are trade-offs between efficiency and fairness. We also investigate how the credit restriction and redistribution affects the truthfulness of these mechanisms.     

高效能,低功耗DDR2控制器的硬件实现

随着SoC芯片内部总线带宽的需求增加,内存控制器的吞吐性能受到诸多挑战。针对提升带宽性能的问题,可以从两个方面考虑,一个办法是将内存控制器直接跟芯片内部几个主要占用带宽的模块连接,还要能够对多个通道进行智能仲裁,让他们的沟通不必经过内部的AMBA总线,甚至设计者可以利用高效能的AXI总线来加快SoC的模块之间的数据传输。另一个办法就是分析DDR2SDRAM的特性后设计出带有命令调度能力的控制器来减少读写次数,自然就能够降低SoC芯片的功耗,为了节能的考虑还要设计自动省电机制。本文为研究DDR2SDRAM控制器性能的提升提供良好的思路。     

The ITU's role in the restructuring revolution

The ITU recognizes a twofold mission: to monitor regulatory policy changes and technological developments to be in a position to advise members; and to link restructuring changes to overall basic telecommunication development needs. The fundamental goal of the international community in this sector is to achieve universal access to basic telecommunications services. In this context, restructuring is but one component, although the global challenge is to work together to ensure that the restructuring revolution paves the way to filling the development gap. It is readily admitted that new technologies such as mobile satellite systems enable developing countries to leapfrog their infrastructure problems, and that governments recognize the potential benefits of these new technologies and the need to reform regulations in order to facilitate the introduction of these services     

Three hundred-mm wafers: a technological and an economical challenge

For the transition from 200- to 300-mm wafers, in addition to the technological challenges, there is the equivalent cost challenge to be met. The ultimate target is cost parity per unit area of silicon between 200 and 300 mm. The major blocking point to be cleared appears to be crystal pulling. The question of cost of crystal pulling is mainly related to the large crystal weights (>300 kg) and to the issue of crystal defects (crystal originated pits (COPs); voids in the Si crystal) generated by crystal pulling. An alternative route to address the defect problem is to use epitaxy to create a defect-free layer of Si for the active device regions. Close co-operation between wafer manufacturers and users is absolutely necessary to address these key issues. Furthermore, to contain cost, wafer makers and device manufacturers have to work together intensively to implement standardisation wherever possible and to avoid cost driving overspecifications (e.g. for front and backside particles or flatness).     

一种曲波域鲁棒数字图像水印算法

提出了一种数字图像水印算法基于特殊选择的傅里叶采样卷绕的快速离散曲波变换.利用Arnold变换对水印信号进行置乱加密,将置乱后的信号进行多次重复来增加冗余度.按照曲波系数分布的特点,选择合适的尺度和系数对水印信号进行嵌入.实验结果表明,该算法对JPEG、加噪、滤波等图像处理具有好的鲁棒性,同时具有好的不可见性.