一种同时实现算子调度与数据流图划分的高层次综合算法

选择分模块的数据通道作为高层次综合的目标结构,完整地定义了同时实现算子调度和数据流图划分的高层次综合算法,并提出一种有效的启发式求解方法.与传统的结构相比,由于在关键路径中消除了全局连线的延时,分模块的结构可以有效地减小时钟周期、优化电路性能.实验结果验证了该方法的有效性     

面向分模块寄存器传输级结构的高层次综合方法

随着集成电路工艺技术的发展，连线延时将逐渐主导系统的性能，传统的高层次综合方法已经不能满足设计的需要。文章讨论了寄存器传输级结构对综合方法的影响，并提出使用分模块的寄存器传输级结构作为高层次综合的目标结构。针对新的结构，概括了设计流程，设计了核心算法。实验数据表明，与传统的方法相比，该方法可以有效地改善系统的性能。     

基于HLS技术的Rijndael算法IP核实现与优化

为了降低传统设计模式在应对大规模SoC设计时带来高复杂度,使用高层次综合HLS技术进行了Rijndael算法IP核的设计、综合与仿真.针对Rijndael算法中的多种运算模块,研究并设计了面向硬件的编码方式及优化方案.通过对比,使用高层次综合技术设计的IP核在各方面都接近或超越了使用传统方式设计的IP核,而设计复杂度大大降低,证明了使用HLS方法进行设计的优越性.     

从复杂系统观点看模块级综合集成航空电子结构

模块级高度综合集成结构是航空电子系统的发展趋势.复杂性、开放性、可扩展性是航空模块级高度综合集成系统的基本特点.从复杂系统基本观点及研究方法出发,研究了航空模块级高度综合集成系统的复杂性问题,指出了解决模块级航空电子综合集成系统复杂性问题的     

数据通路编译器补充了逻辑综合工具

如果使用 Synopsys 公司的设计编译器(Design Compiler)来进行逻辑综合,并在芯片上设计数据通路,最好选用该公心的模块编译器(ModuleCompiler)。使用这种新的综合工具,通过来自高层次结构描述的综合门级描述,就可使用这种新的综合工具来设计数据通路。这种设计流程类似于用RTL Verilog 或VHDL 进行门级逻辑的综合。模块编译器接受一种被写进     

基于硬件描述语言的可逆逻辑描述与验证方法

针对可逆逻辑综合在设计较大规模可逆逻辑电路中遇到的瓶颈,文中借助于硬件描述语言的高层次抽象描述能力以及现有EDA平台的仿真验证功能,通过在模块中添加辅助位的方法,使得模块在具有相应功能的同时具备可逆性,并对模块进行实例化,实现对可逆算术逻辑单元的描述与综合。仿真验证表明,该方法具有一定的可行性和有效性。     

从复杂系统观点看国外IMA发展的经验及教训

模块级高度综合集成结构是航空电子系统的发展趋势,复杂性、开放性、可扩展性是模块级高度综合集成航空电子系统的基本特点.研究了复杂系统的描述方法,并从复杂系统基本观点及系统复杂性度量因素出发,结合国外模块级高度综合集成航空电子系统发展历程,总结了模块级高度综合集成航空电子系统发展的经验及教训,指出了这类系统设计应考虑的重要方向及关键因素.     

MATLAB高层次综合工具性能探究

随着高层次综合工具的快速发展,越来越多的人直接使用C、C++等高级语言来进行设计以缩短开发周期。虽然大部分高层次综合设计基于Xilinx Vivado HLS工具实现,但其主要被硬件开发工程师所熟悉,而MATLAB具有运算能力强、语法简单易于学习掌握、应用范围广等优势,被众多算法工程师接受,因此MATLAB高层次综合工具也具有非常宽广的应用前景。为了探究基于MATLAB的高层次综合工具的设计效率,本文基于MATLAB的高层次综合工具,完成了加法器、比较器、四选一数据选择器、乘法器这些基础运算模块的设计。随后,在Xilinx Vivado开发环境中,将高层次综合设计与传统寄存器传输级（RTL）设计进行了性能对比,使用MATLAB进行高层次综合设计功耗减少程度在-5%~10%区间,面积使用量约增加5%,时序减少程度则是-14%~17%。     

H.264中DCT算法在FPGA上的高层次综合实现

针对传统硬件设计方法在大规模算法应用实现中的高复杂度,提出了一种高层次综合方法,从而实现高效快速地硬件设计。以H.264编码中常用的DCT算法的硬件实现为目的,对算法的C语言实现进行优化,并使用高层次综合工具将优化后的C语言算法描述转换为专用硬件加速器;通过高层次综合工具提供的接口设定、流水线插入、块并行等操作,对生成的硬件作进一步优化;与人为DCT算法的RTL设计和采用高层次综合方法的DCT硬件设计相比,具有更大的设计空间和更高的代码可裁剪性。FPGA实现结果表明,H.264中基于高层次综合方法的DCT算法在节省大量设计开发时间的前提下,可达到每秒处理516兆个整型数的计算性能。     

FFT算法硬件模块的高层次综合实现与优化

针对传统硬件描述语言对模型和算法的结构调整及优化结果对比存在难度大、开发周期长等不足,提出了利用高层次综合的方法进行算法的硬件模块设计。以基于时间抽取的16点基-2 FFT为例,利用C语言对算法进行描述,通过循环展开、数组分割、乘法简化、单个时钟周期长短调整等优化方式对设计结果进行探索。探索结果表明,通过更改C语言数据类型和代码结构,能够快速实现不同性能要求的硬件方案设计,与传统寄存器传输级(RTL)实现相比,大大降低了算法模块的设计难度,缩短了开发周期,便于探索硬件设计过程中的各种可能性。     

智能语音操控在广电端到端的系统设计及应用

在数字化中国的大背景下,在公司个人宽带与互动电视在线交费用户均突破300万户的情况下,为解决我们的用户总找不到自己喜欢看的节目,记不住频道名称和喜欢的节目,提升公司竞争力。通过对前端的点播系统、AAA系统、EPG系统、PORTAL系统、ISMP系统、媒资系统、机顶盒终端的功能进行剥离、整合和详细设计,最后完成终端用户语音操控电视直播、点播、时移、回看、页面操控、系统设置,并支持普通话和四川话方言的目的。达到提升用户体验,增加公司竞争力,促进业务的发展。系统试运行后,用户体验效果得到很大提升,完全达到预期设计目的。     

An Efficient Adaptive Grouping for Single Code Assignment in WCDMA Mobile Networks

For achieving high utilization and efficient code management of the OVSF code tree in 3G WCDMA networks, several researches have extensively studied. Based on combining both the code assignment and the reassignment mechanisms, it increases obviously high utilization and reduces completely the code blocking. Nevertheless, the required rate of traffic should be powers of two of the basic rate, i.e. 1R, 2R, 4R, …, etc., which is impractical and results in wasting the system bandwidth while the required rate is not powers of two of the basic rate. Several multi-code assignment mechanisms have proposed to reduce the waste rate. Nevertheless, these methods bring two inevitable drawbacks including, high complexity of handling multiple codes, and increasing the cost of using more rake combiners at both the base stations and mobile nodes. Therefore, we propose an adaptive grouping code assignment herein to provide a single channelization code for any possible rate of traffic, even though the required rate is not powers of two of the basic rate. Based on the dynamic programming algorithm, the adaptive grouping approach forms several calls into a group. Then it allocates a subtree to the group and adaptively shares the subtree codes for these calls in the concept of time-sharing of slots during a group cycle time. Therefore, the waste rate and code blocking are thus reduced obviously while using a single rake combiner. Since the delay problem may be occurred in such a time-sharing approach, we propose two schemes of cycle interleaving methods to reduce delay. Numerical results indicate that the proposed adaptive grouping approach reduces significantly the waste rate and thus increases the system utilization. Moreover, the proposed cycle interleaving scheme reduces data delay significantly. Ren-Hung Hwang received his M.S. and Ph.D. degrees in computer science from University of Massachusetts, Amherst, Massachusetts, USA, in 1989 and 1993, respectively. He joined the Department of Computer Science and Information Engineering, National Chung Cheng University, Chia-Yi, Taiwan, in 1993, where he is now a full Professor and the Chair of the Department of Communication Engineering. His research interests include Internet QoS, peer-to-peer infrastructure design, and 3G QoS. Ben-Jye Chang received his M.S. degree in computer engineering from University of Massachusetts, Lowell, in 1991 and the Ph.D. degree in computer science and information engineering from National Chung-Cheng University, Taiwan, in 2001. He joined the Department of Computer Science and Information Engineering faculty at Chaoyang University of Technology, Taiwan, in 2002, where he is currently an Associate Professor. His research interests include QoS-based networks, QoS wirless networking, resource management for wireless networks and mobile cellular networks, and performance evaluation of networks. Min-Xiou Chen received the BS degree in computer science and information engineering from Tung Hai University, Tai-Chung, Taiwan, in 1996, and the MS and PhD degrees in computer science and information engineering from National Chung Cheng University, Chia-Yi, Taiwan, in 1998 and 2005, respectively. He is now an assistant professor at the Department of Computer Science and Information Engineering, Chung Hua University, Hsin-Chu, Taiwan. His research interests include wireless communication, SIP, sensor network and resource management in WCDMA systems. He is a member of the IEEE. Kun-Chan Tsai received the BS degree in information engineering and computer science from Feng Chia University, Taichung, Taiwan, in 2001, and the MS degree in computer science and information engineering from National Chung Cheng University, Chia-Yi, Taiwan, in 2003. His research interests include wireless communications and resource management in WCDMA systems.     

现代机载光电探测系统的性能验证技术

机载光电探测系统，从光谱波段划分来讲，包括紫外、可见光、近红外、短波红外、中／长波红外等。现代战争所需要的机载光电探测系统，往往要求多光谱、同视场、同路经、同时段，多源探测模式。作为现代机载光电探测系统，由于其结构和技术的复杂性，按照以往传统的功能和性能考核方法，已不能满足要求。必须针对现代机载光电探测系统的特点，提出特定的考核指标，设计特定的试辁方案。对工作在中波红外和长波红外区域的探测系统，MRTD是使用得最广泛的综合性能指标参数，它考虑了系统各个环节及人机工效特性；对工作在可见光和近红外区域的探测系统，MRC表征了系统的最小可分辨对比度。     

5G边缘计算商用部署和运维关键技术

由于部署地点和应用场景的差异,边缘计算系统存在一体化和云化两种部署模式,导致系统架构、关键技术要求以及运维方式也各不相同。首先分析了两种模式下的应用场景、特征及对系统的需求,其次,从硬件、云化基础设施平台、边缘PaaS平台、安全以及运维等方面对两种模式做了深入分析,最后在上述分析基础上,从商用角度明确了边缘计算在两种部署模式下的系统架构、关键组件技术要求及规格。     

胆小管超微细胞酶学研究

以电镜细胞化学的方法,观察了小鼠胆小管酶的分布。观察的12种酶中,NDPase和G6Pase三种酶分布于胆小管微绒毛;AlPase、Na~+-K~+ATPase、Mg~(++)-ATPase、Ca~(++)-ATPase、CMPase、ACase和5＇-Nase等7种酶分布于胆小管微绒毛,也分布于肝细胞邻接面细胞膜和Disse间隙微绒毛;ACPase、细胞色素氧化酶以及线粒体ATPase不分布胆小管微绒毛,也不分布Disse间隙微绒毛和肝细胞膜。据信,胆小管微绒毛上的酶参与胆汁成份的转运,提供转运所需能量以及还可能与某些代谢过程有关。本实验中磷酸水解酶类使用的铈基法及亚铁氰化钾半还原的锇酸后固定法,效果优于铅法。     

An Investigation of MIMO Performance in the Indoor Ricean Environment

In this paper, we investigate the Multiple-Input Multiple-Output (MIMO) channel capacity in indoor Ricean channels based on MIMO channel measurements at 2.45 GHz. The measured data is analysed using a super resolution parameter estimation algorithm. Our results demonstrate that the line-of-sight (LOS) component in a Ricean scenario influences indoor MIMO performance through increased spatial correlation between array elements. We found that indoor channels with higher values of Ricean K factor have smaller numbers of effective multipath components and increased spatial correlation. Measurement results also showed that, the effect of varying antenna height on indoor MIMO capacity is also due to the spatial correlation of multipath propagation and has a close relationship with the separation between the transmitter and receiver. Zhongwei Tang is currently with the Wireless Technologies Laboratory at CSIRO. He was with Microwave and Wireless Technology Research Laboratory (MWTRL), Information and Communication Group, Faculty of Engineering of the University of Technology Sydney, Australia, where he pursued his Ph.D. Degree. His current research interests include RF propagation, MIMO Space-Time channel measurements, characterization and channel modelling, smart antennas, MIMO systems and array signal processing. Ananda S. Mohan is currently a member of the Faculty of Engineering, University of Technology, Sydney (UTS), Australia where he leads research on antennas, microwaves, wave propagation, and wireless technology. He received a Ph.D. degree in electrical communication engineering from the Indian Institute of Technology, Kharagpur, India and was a Scientist and Senior Scientist at the Research and Training Unit for Navigational Electronics, Hyderabad, India. At UTS, he directed the Sydney microwave design resource centre and was the associate program leader of the co-operative research centre for satellite systems. He currently directs the microwave and wireless technology research laboratory and a core member of the university research centre on health technologies. His current teaching and research interests include wireless mobile communications, microwaves and antennas, smart antennas and applications of microwave and wireless technology in medicine and has obtained many competitive research grants in these areas. Dr. Mohan was a co-recipient of the Priestly memorial award from the Institute of Radio and Electronic Engineers (IREE), Australia. He was a member of the organizing and technical Program Committees of the IEEE Globecom'98, APMC 2000, and International Symposium on Wireless Systems and Networks, 2003 and IASTED International Conference on Antennas, Radar, and Wave Propagation, for 2004 and 2005.     

大气辐射传输模拟器(ARTS)软件的介绍

随着气候变化、环境监测、大气遥感等领域的发展,大气辐射传输研究的重要性日益凸显,往往需要进行辐射传输模拟,计算大气透过率、光谱辐亮度等参数、进行部分气象要素的反演等,因此亟需发展快速精确、普遍适用的辐射传输模式。主要介绍了一种高度模块化、广泛适用的辐射传输模式--ARTS(the atmospheric radiative transfer simulator),介绍了模式的研制背景、主要功能、计算流程、应用领域等,并给出了部分模拟实例的结果。目前,该辐射传输模式已成功应用于Odin/SMR、MASTER与SOPRANO等探测器的正向模拟与反演系统。     

基于GNSS_CN高速公路自动收费系统的研究与设计

本文独创性的提出将多卫星定位系统融合来提高定位精度,并采用高可靠、高精度的定位应用于高速公路等收费系统中,实现了基于GNSS/CN高速公路收费车载单元的研究与设计.介绍了车载单元工作原理,以及硬件和软件系统的设计方案,通过硬件和软件设计与调试,相比原有单一卫星定位系统,在多卫星定位系统融合的基础上,实现了更高精度的定位.车载单元利用GPS或/和BD等系统获取车辆的位置、速度等信息,通过蜂窝网络和控制中心进行通信,将位置、速度等信息发送到控制收费中心,可在控制收费中心和车载单元上进行地图匹配,动态显示车辆位置、速度以及收费等信息.该成果已成功试运行.     

Survey on data security and privacy-preserving for the research of edge computing

With the rapid development and extensive application of the Internet of things (IoT),big data and 5G network architecture,the massive data generated by the edge equipment of the network and the real-time service requirements are far beyond the capacity if the traditional cloud computing.To solve such dilemma,the edge computing which deploys the cloud services in the edge network has envisioned to be the dominant cloud service paradigm in the era of IoT.Meanwhile,the unique features of edge computing,such as content perception,real-time computing,parallel processing and etc.,has also introduced new security problems especially the data security and privacy issues.Firstly,the background and challenges of data security and privacy-preserving in edge computing were described,and then the research architecture of data security and privacy-preserving was presented.Secondly,the key technologies of data security,access control,identity authentication and privacy-preserving were summarized.Thirdly,the recent research advancements on the data security and privacy issues that may be applied to edge computing were described in detail.Finally,some potential research points of edge computing data security and privacy-preserving were given,and the direction of future research work was pointed out.     

SEM在半导体工艺研究中的应用实例

根据半导体工艺的需要,介绍了利用SEM分析工艺问题的方法。主要包括样品的解理、缀饰及为提高导电性所采用的镀膜方法比对,其中高效、准确的解理定位是重要前提。三个典型案例中,埋层漂移是在问题刚显露时就得到及时分析、彻底解决;而MEMS器件悬臂梁断裂翘曲及减少鸟嘴工艺,则是在研制开发新工艺过程之初,就列为"定点清除"的主要问题。上述问题是发生在科研生产中的实例,且均已在工艺规范层面定型。在形成成品之前,特别是工艺设计及加工制造阶段的失效分析及可靠性研究,能够在隐患转变为大面积工艺问题及后期性能参数问题之前,就能够提早定位并彻底解决,更为今后产品大规模量产及产品升级换代提供客观准确的科学依据。SEM是其中的重要技术手段,尤其在线检测分析更是物尽其用。