基于FPGA和USB在图象采集系统中设计

本文提出了一种基于USB和FPGA的高分辨率图形采集分析系统的设计方法,可用于采集并分析高分辨率的模拟RGB分量视频信号,通过USB2.0的接口进行输出。通过使用XILINX公司的嵌入式处理器软核MICROBLAZE来实现在图象采集系统设计过程中的控制功能并实现与FPGA逻辑模块通信的功能。通过该设计证明了系统的实用性。     

基于FPGA的可重新配置片上导航计算机设计

采用Virtex-4 FPGA芯片设计了片上组合导航计算机系统.该导航计算机使用FPGA内嵌的PowerPC硬核处理器进行导航运算,在FPGA逻辑中集成IP核来实现控制、接口通信和部分运算的硬件加速,提高了系统集成度.此外,该系统还可以通过硬件编程对FPGA逻辑进行重新配置,使该导航计算机在不同应用场合满足对接口、功能的要求.     

众核处理器上的高性能网络入侵检测系统

为提高网络入侵检测系统(NIDS)在互联网流量和网络攻击数量增长下的性能,进行了在多核处理器上利用并行结构提高NIDS处理能力的研究.首先实现了NIDS在TILERA-GX36众核处理器上的数据并行(RTC)和任务并行(SPL)这两种并行机构方法,实验结果表明众核处理器上丰富的计算资源支持大量并行的NIDS实例,但同时也带来严重的资源竞争和冲突,系统并行化开销大大增加.为此,提出了一种基于共享的RTC方法,即SRTC方法,和已有方法相比,SRTC方法解决了RTC模型内存占用线性增长的问题,同时避免了SPL模型中的线程间通信开销.以开源NIDS软件Snort为基础,在TILERA-GX36众核处理器上对SRTC方法进行了实现和验证,实验结果证明采用SRTC的并行系统获得了类似线性的加速比,当加载超过7000条NIDS真实规则条目时,系统能够处理包长为1K字节的10Gbps的网络流量.     

A hybrid task scheduling scheme for multicore processors based on improving the EDF algorithm

为解决多核处理器系统中的实时任务调度问题,尤其是实时任务和非实时任务的混合调度问题,在对最早截止时间优先(EDF)算法进行改进的基础上,提出多核处理器混合任务调度算法——EDF-segment算法.EDF-segment算法可以整理调度混合任务时出现的碎片,并通过对碎片的迁移、合并提高处理器的利用率,从而提高系统处理混合任务的性能.通过EDF-segment算法不但可以解决混合任务的调度问题,还可以避免使用EDF算法时造成的多核处理器利用率下降,在保证实时任务处理延迟的前提下提升多核处理器的利用率.经过理论推导和实验分析证明,EDF-segment算法可以有效地应用于多核处理器系统中.     

基于FPGA的8位RISC软核微处理器设计

介绍基于FPGA的8位5级流水线RISC处理器软核设计,给出系统结构图及主要模块和流水方式的设计,给出其指令系统。对系统模块进行仿真和综合,结果达到设计要求。设计基于FPGA的软核RISC处理器设计,具有较强的可移植性。     

多核处理器片上网络trace压缩方法

针对多核处理器的硅后调试和验证的困难,研究了克服这一困难的重要手段--对处理器片上网络(NOC)的trace信号的抓取.由于片上网络的trace数量庞大,为满足片上存储资源和trace实时导出带宽的限制,需要对trace进行压缩处理.和传统的单核或片上系统(SOC)平台不同,多核处理器的应用复杂,因而片上网络trace...     

基于多核CPU／FPGA／TCAM的高性能路由查找硬件方案

文章介绍了基于Cavium OCTEN5860多核CPU作为主处理器，Altera Stratix II EP2S30 FPGA芯片作为桥接芯片，NetLogic NL71024 TCAM作为路由查找芯片的高性能路由查找硬件实现方案。     

基于NiosII的LFM时延差编码解码器

提出一种LFM信号时延差编码的解码检测系统设计方案,在单片芯片上实现了直接数字下变频器（DDC）,复相关器以及基于NiosII软核处理器的软件系统,完成了片上实时LFM信号检测接收系统的设计,充分发挥了FPGA高速并行处理和C语言灵活、易升级维护的特点,实现了系统软硬件的完美结合。     

一个面向异构多核处理器Cell的资源分配模型

为了充分利用多核处理器提供的多级并行和解决多核资源分配问题,提出了一种将多任务并行程序映射到多核处理器平台上的模型驱动的方法。该方法首先创建一个三维优化空间来表示资源分配配置,而后通过搜索该空间为应用生成多种并行机制,最后对各种并行机制进行静态评估从而找出最优的机制。该方法同时考虑了任务并行、数据并行以及通讯开销。在异构多核处理器Cell上利用一个图像处理应用对此方法进行了测试。实验表明,这种模型驱动的方法能够很好地评估性能并为应用确定有效的并行机制。     

基于FPGA的USB3.0通信接口设计

针对大批量高速数据传输的准确性和稳定性问题,本文设计了一种适用于FPGA开发使用的USB3.0通信IP核接口.采用Cypress公司的CYUSB3014芯片作为USB3.0器件,在vivado软件上进行USB3.0通信IP核接口的软件设计,最终在以FPGA作为主控芯片的USB3.0高速数据传输系统上对该IP核进行测试.测试结果表明,该IP核实际可达到的最大上行通信速率可达253.1 MB/s,下行最大通信速率可达131.9 MB/s.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.