光互连网络中排序算法研究

通过对光互连网络排序算法的研究,提出利用二分法构造二分图依次确定内外节点开关的连接状态,得到可重排无阻塞的 Omega 网络, Banyan 网络和 Crossover 光网络,每种光互连网络都可实现 8×8 信号全排列无阻塞的输出和排序。针对二分法互连函数不一致的问题,继而采用优化的 Looping Algorithm 算法,生成路由标签确定各级节点开关的状态,从而得到互连函数相同结构简单性能优越的光网络。     

自由空间光子交换无阻塞榕树网络与可重排Benes网络的拓扑等价

光子交换技术是解决高速的光纤传输系统和低速的电子交换系统之间速度失配的根本措施。文中提出了无阻塞自由空间光子交换榕树网络的拓扑结构与实现方案，并采用互连网络拓扑等价的图分析法研究了无阻塞榕树网络与可重排Ｂｅｎｅｓ网络的拓朴等价及其多样性。为拓展无阻塞榕树网络在光子交换系统及多处理计算机系统的潜在应用提供了理论依据。     

HCONoC: a novel high-performance hierarchical optical network on chip

针对传统的片上电互连在带宽、时延等方面遇到的问题,提出一种基于光分组交换技术的分层簇的光片上网络(HCONoC).设计了该网络的拓扑结构连接方式、布局方法、节点编址命名方法以及扩展方式等.为HCONoC的不同层次结构分别构建了新的无阻塞片上光路由器结构,并分析了损耗特性.根据网络拓扑的具体特点和编址方式,设计了有效的路由算法,可提高网络吞吐同时减少时延.最后,使用OPNET搭建仿真平台,对所提网络结构的时延和吞吐性能进行了仿真,结果表明该网络结构在本地流量模式下显示出更强的性能优势.     

光传输热点应用展望

光网络跟所有的通信系统一样,是利用光信号来进行信息交换传输的。光通信系统主要由源、目的地和通信媒体组成,根据光通信媒体的选用,可将光网络分为导向和非导向系统。光传输热点应用进行展望性研究。     

基于VPX标准的RapidIO交换和Flash存储模块设计

针对某阵列信号处理系统中的互连总线和数据存储问题,提出了基于VPX标准的RapidIO交换和Flash存储模块的设计方案,并完成了该模块的软硬件设计.介绍了新一代高速串行总线RapidIO和VPX标准,根据VPX标准设计板卡,利用Tsi578交换机设计RapidIO网络实现多DSP系统的并行处理结构.研究了RapidI...     

90nm工艺互连线CMP金属厚度偏离统计学分析(英文)

亚100纳米工艺下CMP在铜双大马士革工艺中导致的金属厚度偏离对互连线信号完整性具有严重影响.为实现90纳米工艺下互连线精确仿真,本文提出了一种新的互连线分析算法.该方法通过估计寄生参数分布的均值和方差,实现了金属厚度偏离对互连线性能影响的统计学分析.TCAD工艺仿真试验表明该方法可有效实现对90纳米工艺互连线的精确仿真.     

光电信息技术的某些发展前沿

本文着重如下内容 :1.波长路由在光互连中的应用 :提出适用于环网的光互连接口 (OII)组件和波长路由交换器件 (WRS)的设计 .网络为多层结构 ,第一层为λ1子环网 (RSN) ,第二层为λ2 子环网等 ,层间通过 WRS连接 .2 .微机电系统 (MEMS)可能在下一代通信网络中占重要地位 :随着信息技术的发展 ,使微电子信息处理向系统级芯片技术发展 ,从微型化或性能价格比来看 ,把信息获取、处理和执行集成在一起的微机电系统 (MEMS) ,特别是光机电一体化集成芯片 ,或称为微光机电系统 (OpticalMEMS或 MOEMS)是很合理的 .3.结合光通信中 WDM技术的发展 ,研究了用用一块光栅模板在 Tal-bot干涉仪上刻写多种频率的光纤 Bragg光栅 .     

MEMS光开关应用于机群系统光互连网络

建立了千兆位传输结构的高性能光互连网络 ,以提高计算机机群系统的网络性能 .利用MEMS 4× 4光开关和具有硬件路由功能的光互连网络PCI总线接口卡构成光互连链路 .光信号传输速率达 1Gbits/s以上 .基于MEMS的全光无堵塞光开关减少了光 电转换 ,开关方式与光信号的波长、速率和数据格式无关 .利用这种网络结构 ,可以最大限度地减少网络延迟和网络通信开销 ,提升了机群系统的总体性能 .利用MEMS 8× 8光开关设计了星型环型混合拓扑的光互连网络 .采用了具有硬件路由功能的光互连网络接口卡 ,并以Ethernet为控制网络实现了对MEMS光开光的动态配置 .分析并测试了光互连网络的通信性能 :峰值数据传输率可达 1Gbits/s ;数据量在 3Mbytes以上时 ,网络整体性能明显提高     

MEMS加速度计三维堆叠模块化封装及垂直互连

传感器系统微小型化的发展趋势是将各功能模块进行三维模块化集成.本研究将加速度计芯片及调制解调电路进行三层堆叠模块集成.其中,各层模块的组装采用了FR4基板上的COB工艺,而垂直互连采用了一种新型的垂直定位装置进行定位和回流焊,实现了加速度计和调制解调电路的三维堆叠模块化封装结构.该结构成功把MEMS器件与IC芯片混合集成在同一模块里;采用了一种新的定位销/孔的定位方式,可同时进行3×3个模块的高精度堆叠定位(其对位误差约0.068mm);通过丝网印刷焊膏,一次回流焊接完成堆叠模块的垂直互连,互连强度高(单个焊点平均强度为30～40MPa);封装体积小(整个加速度计调制解调系统封装后的体积为19×19×8mm3).还讨论了垂直互连的影响因素.对模块进行的剪切力测试表明采用印刷焊膏回流实现垂直互连的强度满足相关标准.     

光交叉连接技术

随着网络化时代的到来，人们对信息的需求与日俱增。为了适应这种需求，通信的两大组成部分——传输与交换，都在不断地发展与变革。WDM技术的实用化，使光纤的传输容量极大提高，为高速大容量的宽带综合业务网的传输提供了有效途径。而传输容量的飞速增长带来的是对交换系统发展的压力和动力。由于电子器件本身的物理极限，传统的电子设备在交换容量上难以再有质的提高，因此交换过程中的电子“瓶颈”问题成为限制通信网络吞吐能力的主要因素。为了克服传统光通信网络由于电子交换所带来的“电子瓶颈”，提出了全光网的概念。与传统光通信网络不同，全光网任意两个结点之间的信号传输与交换全部采用了光波技术。这就提出了光交叉连接（OXC）。     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

中国质量(北京)大会(英文)

正Themed on"quality,innovation,development",the first China Quality Conference(Beijing)was held in the Great Hall of the People on September 15.Chinese Premier Li Keqiang delivered an important speech at the conference.State Councilor Yang Jing and Wang Yong attended the conference with over 600 domestic and international representatives from foreign,regional and international quality organizations     

National Working Meeting on Land and Resources Standardization

正The National Working Meeting on Land and Resources Standardization was held in Beijing on July 15,2014.Wang Min,the Deputy-Minister of the Ministry of Land and Resources,and Yin Minghan,the Chief-Engineer of SAC addressed the meeting.Representatives from relevant competent departments and technical committees were present.The meeting aims to summarize work,discuss existing problems and make clear working thoughts,promoting standardization work of land and resources to a new level.Wang Min pointed out that the standardization work of land and resources should be centered on the basic principles of"protecting land and resources dutifully,intensively and economically utilizing land and resources,and making all-out efforts to safeguard the public’s rights and interests",highlighted the