数字抢答器课程设计

设计一种集抢答、定时、计时、违例、组号显示、声讯、自动复位的智能化竞赛设备。采用EDA技术进行了电路设计与仿真,硬件电路已在自主研发的FPGA创新开发实验箱上实现,技术性能达到了设计要求。     

OTN技术特点及发展趋势分析

通过分析OTN的技术特点,提出了OTN技术的发展方向,包括分组增强型OTN的发展、WSON技术的发展及需要解决的问题、光子集成(PIC)技术的发展和超100 Gbit/s时代的OTN演进趋势.     

Bottom-contact small-molecule n-type organic field effect transistors achieved via simultaneous modification of electrode and dielectric surfaces

Low-voltage, n-type organic field effect transistors (OFETs) with simultaneously modified bottom-contact (BC) electrodes and dielectric were compared to their top-contact (TC) counterparts. The devices modified with 6-phenoxyhexylphosphonic acid (Ph6PA) self-assembled monolayer (SAM) showed similar performance, morphology, and contact resistance. Electron mobility of C₆₀ devices were 0.212 and 0.320 cm² V⁻¹ s⁻¹ and [6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) devices were 0.04 and 0.06 cm² V⁻¹ s⁻¹ for TC and BC devices, respectively. Low contact resistance between 11 and 45 kΩ cm was found regardless of device architecture or n-type semiconductor used. This work shows it is possible to fabricate solution processable low-voltage bottom-contact devices with performance that is similar or better than their top-contact counterparts without the addition of complex and time-consuming processing steps.     

Enabling multiparty karaoke over Internet based on low‐level computers: practice and experiment

Karaoke is a system for amateur singing. The traditional online karaoke system does not allow multi‐singers to sing a song in one session. This study designs and implements multiparty karaoke over Internet (MKI) based on low‐level computers. The MKI is an online karaoke system of distributed architecture that allows multi‐singers to sing a song in one session. The MKI must deal with the problems of feedback, asynchronous audio latency at singers’ nodes, round‐trip latency at an inviter's node, and multi‐singers singing a song in one session. The acoustic isolation between microphone and speakers avoids feedback. Network Time Protocol avoids asynchronous audio latency. The third method's round‐trip latency in this study is within 86 ms, and all participants experience the simultaneous singing of the inviter and the invitees. MKI can be used for increasing leisure time, singing skills, and interpersonal relationships. Copyright © 2011 John Wiley & Sons, Ltd.     

面向LEO卫星网络的高效路由算法

由于卫星星上处理以及存储能力有限,随着卫星网络的规模越来越庞大,迫切需要一种简单高效的路由算法.为此,提出了一种基于网络拥塞程度感知的路由策略(Network Congestion-Aware Routing Algorithm,NCARA).NCARA路由策略在网络处于非拥塞状态时采用Dijkstra算法寻路,网络拥...     

基于DES密码电路的差分功耗分析仿真研究

差分功耗分析技术是目前应用广泛、技术发展较成熟的非侵入攻击技术,设计了一个功耗分析仿真平台,该平台具有自动化程度高、精度高和仿真速度快的特点.此外,还基于该平台实现了对DES密码电路的差分功耗分析,对数字电视机项盒安全性的提高具有参考意义.     

基于单片机的多功能温度测量仪表的设计

介绍了一种基于单片机控制的集测量与变送一体化的多功能数字温度测量仪表.该测温仪将热电偶和温度指示仪表以及变换发送单元集成在一起,采用便携式结构.它不仅可以就地安装,用作温度测量的指示与变送单元,而且,还可以随身携带,用作普通温度测量仪表.现详细介绍其软硬件组成和工作原理.     

基于ARM及GPRS的潜油泵保护系统

针对潜油电泵在深井、高温、长期连续工作条件下,极易出现故障以及油井分散、现场数据返回不及时,导致故障发生不能及时地预测、报警和处理等一系列的问题.现介绍了一种基于ARM和无线网络技术的潜油泵远程监控保护系统,取代了传统单片机来实现数据采集、预处理和通信等功能,具有稳定可靠、永远在线、价格低廉的特点.并着重介绍了该系统的硬件设计以及监控中心的软件实现.     

电信套餐资费策略演进分析

资费作为业务的重要组成部分,其策略制定与电信企业的总体业务发展战略密切相关,也深受政府电信资费政策改革的影响。本文首先从全球电信资费的改革历程入手,详细解读了我国电信管制政策及电信资费发展趋势。其次,选取了北京联通及各运营商有代表性的3类产品资费策略进行详细分析,对运营商之间的资费策略进行了比较,深刻揭示了电信运营商的资费策略演进路线,在全业务竞争时代,运营商的资费策略已经由单纯降价逐渐演变为全业务深度渗透捆绑,同时指出了针对不同微分市场开展全业务资费策略设计的关键所在。     

Power harvesting with PZT ceramics and circuits design

Power generated from a piezoelectric material usually comes with poor characteristics such as high voltage, low current and high impedance. In order to drive the embedded sensor circuit, piezoelectric power needs to be characterized and regulated. In this paper, we present an analysis on the power generation characteristics and the efficiency of power conversion of the stiff lead zirconate titanate (PZT) ceramics. Moreover, a power circuit design is put forward in the application where PZT elements are used for power generation in a TKR implant. A hybrid direct current (DC)–DC, comprising a switched capacitor (SC) DC–DC converter and a low dropout (LDO) linear voltage regulator, is presented. The variable ratio SC converter has been taped out with 0.35 μm CMOS technology. The test results show that the SC converter can transfer the input voltage that ranges from 5 to 14 V from the PZT ceramics into the voltage ranging from 2 to 2.5 V which will be dealt with by LDO circuit whose efficiency can reach 80%.