学生就业评估系统平台的改进设计与实现

传统学生就业评估系统平台设计存在控制性能低,收敛性不好等问题,因此,提出学生就业评估系统平台的改进设计方法。给出学生就业评估系统平台设计总体构架,对学生就业评估系统进行硬件设计和分析。其硬件设计包括DSP数据处理模块、信息采集模块、直接控制器、数据转换器、休眠控制模块和电源模块等,并对DSP数据处理模块进行了重点分析。采用自适应信息融合方法进行学生就业评估系统平台改进设计,构建学生就业评估程序控制指令集,实现学生就业评估系统平台的改进设计。实验结果表明,当迭代次数为10时,该文方法的时延误差为0.29 s,传统方法的时延误差为0.45 s;当迭代次数为40时,该文方法的时延误差为0.27 s,传统方法的时延误差为0.5 s。采用该设计进行学生就业评估系统的时延误差低,提高了学生就业评估系统的控制收敛性。     

单光纤激光点火控制系统的研制

根据单光纤激光点火装置的功能需求,研制了单光纤激光点火样机的控制系统,该系统采用双波长单光纤的光路设计结构,与单光源双光纤结构相比具有更高的可靠性与安全性。系统主要包含人机通信模块、激光器驱动模块、光电转换模块、点火时间测量模块、安保模块等几个部分。以触摸屏作为人机交互的界面与主控制器之间进行相互通信,实现对各个功能模块的控制。利用MDK开发工具设计了系统软件,并进行了整机输出测试。结果表明:安保模块中光开关的插入损耗小于3 dB;当检测激光功率为1 mW、脉宽为20 ms时,检测电压大于1. 2 V,表明系统光路具有连续性;整机输出功率与设置功率的最大偏差不超过3%。     

一种语言实时检测和处理系统

本文介绍了一种用于电话语音检测及处理的智能处理系统,分析了该系统的功能,设计了实现其功能的系统的网络结构、硬件结构,同时对系统功能进行模块化划分,阐述分析了各软件模块的功能,并分析了语音资料的处理流程及系统各模块的关系。     

WCDMA速率适配算法的FPGA实现

为了支持多媒体业务的传输、第三代移动通信WCDMA系统采用了独特的编码复接方案，同时也加大了系统复杂度，并引入了较长的处理时延。速率适配算法是业务复用方案的核心算法。本文具体提出了在FPGA中进行模块合并、产生凿孔图样进行比特积攒搬移的实现方案，缩短了处理延时、大大提高了系统的处理能力。     

一种语音实时检测和处理系统

本文介绍了一种用于电话语音检测及处理的智能处理系统，分析了该系统的功能，设计了实现其功能的系统的网络结构，硬件结构，同时对系统功能进行模块化划分，阐述分析了各软件模块的功能，并分析了语音资料的处理流程及系统各模块的关系。     

性能驱动系统划分的均场退火方法

本文通过把时延约束条件转化为一个布尔矩阵，利用这个布尔矩阵构造能量函数的时延约束项，从而解决了用神经网络处理时延约束这类不等式约束的难题，并据此提出了一个性能驱动的ＶＬＳＩ系统划分的均场退火算法．算法不仅考虑了模块间的连接关系，还考虑了版图的物理结构，是一种逻辑与版图相结合的划分方法．实验表明，该算法具有较强的寻优能力     

甚长基线干涉测量数字基带转换器子通道时延影响分析

为提高甚长基线干涉测量(VLBI)带宽综合处理精度,在接收系统各通道时延一致的情况下,对数字基带转换器(DBBC)子通道时延对带宽综合精度的影响进行了分析。通过理论推导,首次发现在单站群时延测量中,子通道时延会使不同子通道之间产生相位阶梯,引入带宽综合处理误差;在双站时延差测量中,当两个观测站相应子通道本振频率差不相同时,也会出现相位阶梯,降低带宽综合处理精度。针对不同数字基带转换器结构,讨论子通道时延的影响域,提出通过子通道时延补偿消除相位阶梯。仿真结果表明,子通道时延补偿可以有效消除相位阶梯,使带宽综合处理精度至少提高一个量级以上。     

水下目标定位系统的信号处理模块设计

针对水下目标的主被动定位功能需求和具体的技术指标要求,结合数字信号处理器(DSP)和现场可编程门阵列(FPGA)的各自优势,设计了基于DSP及FPGA的数字信号处理模块,以此处理模块为硬件平台,编程实现了相应的时延估计应用程序,并进行了实验验证,实验结果表明此信号处理系统时延估计精度高,满足了目标定位的要求。     

低功耗并行的提升式5/3二维离散小波变换的VLSI架构

离散小波变换需要较大的运算量和运算空间,为了提高JPEG2000图像压缩速度,提出一种基于提升算法的二维离散5/3小波变换的VLSI架构,这种结构同时进行行变换和列变换。文章对于VLSI架构的五大模块(行小波变换运算模块、两个列小波变换模块、FIFO寄存组和系统整体控制模块)的硬件实现给出了相应的方案。在Quartus II 7.2的平台下对于设计的该系统的时序仿真测试结果表明,综合分析后系统最小组合逻辑时延为7.142ns,可达到的最高频率为140.02MHz。时序仿真测试中当系统工作频率为100MHz,数据吞吐率达到773.944Mbit/s。     

基于单片机ATmega16的无线温度监测系统

利用AVR系列的ATm ega16单片机、无线收发模块nRF24L01、数字温度传感器DS18B20和LCD1602液晶显示器设计了无线温度监测系统。该系统通过配置ATm ega16单片机,采集DS18B20转换的温度量,将温度信息显示在LCD1602液晶显示器上,同时通过无线收发模块将温度信息传送到管理终端进行显示和处理。系统同时保证当被测温度不在合理范围时发出声音报警信号。     

基于可编程硬件的虚拟路由器数据平面设计与实现

未来网络体系结构创新和验证亟需建设虚拟化网络实验平台,虚拟路由器作为其中的核心组网设备,其结构和性能决定了实验平台的灵活性和承载能力.本文提出基于并行流水线的虚拟路由器数据平面结构,结合并行包分类和异步多指针轮询调度机制,在同一物理底层上实现了多个相互隔离的并行异构路由器.本设计在可编程硬件上进行了原型实现,并结合商用及软件路由器在真实的网络环境中部署、测试与实验.实验结果表明与传统单流水线结构相比,本设计能以更高灵活性和并行性支持异构的路由器实例独立运行;在逻辑资源开销和延时特性未显著增加的情况下,并行虚拟路由器可以达到与硬件可比的线速转发能力.     

A novel architecture of optical code label processing in parallel designed for all optical routing system

A novel architecture of optical code label routing is designed based on optical code division multiplexing techniques, which performs the data packet forwarding and processing in parallel with a way of making the label and payload encoded and decoded separately. It uses optical polarity characteristics to realize the separation of the label and payload, employs fiber Bragg grating to encode/decode the label and payload so as to process them in parallel, and makes the forwarding and routing process realized in the optical domain. In the core router, the separation of the label and payload guarantees that the switch processing only includes the short label code recognition, without processing the payload. The payload recognition is carried out in the edge router. Thus, the router can simplify the processing of encoding and decoding in the core router, accelerating the switching, and increase the throughput greatly. Moreover, the novel routing scheme not only supports the varying of data packets, transparent transmission, fine granularity switching, and so on, but also is suitable for the aggregation of data service. It is attractive for the future development of all optical routing.     

一种动态分配输入队列的片上虫孔路由器结构

为了降低片上网络（NoC）由于虫孔缓冲结构排头（HoL）阻塞导致的性能损失,同时消除虚通道缓冲结构对可变长度报文表现出的缓冲区低利用率现象,本文采用虚拟通道技术提出一种动态分配输入队列（DAIQ）的片上虫孔路由器结构.该结构采用一种令牌表的方式支持虚拟队列深度与数量的动态分配,同时为了支持同一报文微片能够连续调度,本文还提出一种新颖的开关分配机制——SRRM,该机制在高负载下进一步改善了开关的延迟与吞吐率.仿真与综合的结果表明,相比传统虚通道流控的片上路由器结构,DAIQ路由器以50%的缓冲面积获得类似的性能,在0.13微米CMOS工艺下节约了30.18%的标准单元面积与384%的功耗.     

QNoC asynchronous router

An asynchronous router for quality-of-service Networks on Chip (QNoC) is presented. It combines multiple service levels (SL) with multiple equal-priority virtual channels (VC) within each SL. VCs are assigned dynamically per packet in each router. The router employs fast arbitration schemes to minimize latency. Analytical expressions for a generic NoC router performance, area and power are derived, showing linear dependence on the number of buffers and flit width. The analytical results agree with QNoC router simulation results. The QNoC router architecture and specific asynchronous circuits are presented. When simulated on a 0.18 μm process, the router throughput ranges from 1.8 to 20 Gbps for flits 8-128 bits wide.     

Highly-scalable load-balanced router with optical switch fabric

A novel load-balanced optical packet router architecture is proposed and demonstrated. High scalability and reduced complexity are achieved by using optical switch fabrics, FPGA-based 10 Gbit/s packet processors and no centralised scheduler.     

Performance evaluation of an intelligent routed WDM mesh network: An analytical approach

This paper presents an analytical model of an optical mesh network capable of handling WDM traffic intelligently. The router is modeled as a processor to read the instructions in the header of the packet to implement the required algorithm adopting standard queuing concepts. Packet stacking, switching, or routing performance deliberately depends on packet size, node architecture and network parameters. The numerical result shows a huge data transmission through the router with a least dependence on the routing time up to a significant data rate and thus provides a significant improvement in call connection probability.     

MPLS-Linux体系结构及交换路由性能分析

本文详细介绍了MPLS-Linux的体系结构、核心数据结构、标签交换过程和QoS运行等实现技术，通过对MPLS-Linux组成的交换路由系统进行性能测试和分析，发现：在链路轻载或预留带宽的情况下，交换路由系统对数据流的服务质量优于传统路由系统；只有综合应用策略路由、数据报分类调度和标签交换才能实现Internet环境下对端到端服务质量的控制。     

ID/Locator Split-Based Distributed Mobility Management Mechanism

We have designed the heterogeneity inclusion and mobility adaptation through locator ID separation (HIMALIS) architecture to support mobility natively in the New Generation Network. This paper proposes a new distributed mobility scheme in the HIMALIS architecture for supporting seamless mobility for the host moving across access networks of different network-layer protocols. The proposed scheme also supports mobility of an access network. It includes a signaling procedure to redirect downstream traffic from the previous gateway (or previous access router) to the new gateway (or new access router) to minimize the service disruption or packet losses during a handover. The performance results obtained from a testbed implementation in Linux validate the effectiveness of the proposal. The results demonstrate that it can achieve seamless (no packet loss) handovers if overlapped wireless access networks are available.     

High-performance optical-label switching packet routers and smart edge routers for the next-generation Internet

This paper discusses the architecture, protocol, analysis, and experimentation of optical packet switching routers incorporating optical-label switching (OLS) technologies and electronic edge routers with traffic shaping capabilities. The core optical router incorporates all-optical switching with contention resolution in wavelength, time, and space domains. It is also capable of accommodating traffic of any protocol and format, and supports packet, flow, burst, and circuit traffic. The edge router is designed to achieve traffic shaping with consideration for quality of service and priority based class-of-service. Simulation results show packet loss rates below 0.3% at load 0.7 and jitter values below 18 /spl mu/s. The traffic shaping reduces the packet loss rate by a factor of /spl sim/5 while adding negligible additional latency. The OLS core routers and the electronic edge routers are constructed including the field-programmable-gate-arrays incorporating the wavelength-aware forwarding and contention resolution algorithms. The experiment shows optical-label-based packet switching with a packet loss rate near 0.2%.     

区分服务中一种拥塞感知的单速三色标记算法

确保服务的实现依赖于在边界路由器执行的数据包标记策略和在核心路由器执行的队列管理策略.TCP流由于其拥塞自适应的特点对丢包很敏感,网络拥塞对其吞吐量影响很大.为此,我们设计了一种拥塞感知的单速三色标记算法CASR3CM.仿真实验表明,该算法不仅提高了AS TCP流的平均吞吐量,而且增强了吞吐量的稳定性.另外该算法也提高了AS TCP流之间占用带宽的公平性.