中小型企业类门户网站分析与设计

随着信息时代的到来,企业类门户网站得到了极大地普及,越来越多的企业开始着手建设具有自身企业特色的门户网站,期待这些门户网站能够扩展企业的业务量,从而大幅增加企业的效益。本文提出了一种采用HTML、CSS及JavaScript技术实现小型企业类门户网站的具体分析和设计方法,希望能对中小型企业类门户网站的快速,有效建立起到一定的促进作用。     

构建在中小规模CPU上的实时UML框架程序设计环境

为了能够同时在16位或8位中小型CPU上使用实时操作系统和基于UML的可视化图形程序设计方法进行应用程序设计,在此详细讨论了将一种新式嵌入式实时UML框架程序设计平台移植到TMS320LF2407上全部过程,通过状态机部件、基础框架、任务管理内核和跟踪调试器的移植证明了这种平台在中小型CPU上运行的可行性、便捷性和高可靠性等优点。最后,通过航天相机控制器应用程序设计实例中各个任务线程的执行时间测量结果及可调度结果进一步验证了该平台的实用性。     

Loop based design for wafer scale systems

This paper presents a loop based design scheme suitable for wafer scale systems and introduces a variant of the basic reconfiguration algorithm. The underlying topology has been extended to a nonplanar graph of vertex degree five. The yield for this system is higher than that of a planar graph of vertex degree six and requires less hardware for its implementation. Several comparisons among various topologies and reconfiguration algorithms are made within the context of percolation models     

基于功能综合的模块化通信导航识别系统总体设计

针对直升机和高级教练机对轻小型机载通信导航识别(CNI)系统的实际需求,从孔径、射频信道及信号处理、系统控制及数据处理三个层面分析了现有联合式和综合化通信导航识别(ICNI)系统架构的技术特点,提出“分布式信道处理、综合化控制管理”的设计思想,搭建了一种全新的基于功能综合的模块化通信导航识别(MCNI)系统架构,并给出了硬件构型及软件框架.实际工程应用表明,在同样功能配置的情况下,该架构在系统重量、体积、功耗等方面优势明显,可为其他平台CNI系统设计提供借鉴.     

一种适合中小企业易操作的统一通信系统的研究与设计

通过分析中小企业统一通信应用的需要,结合目前市场上存在的统一通信系统的情况,设计了一套适合面向中小企业的功能简单、价格便宜的统一通信解决方案。     

基于CWDM的波长转换器模块化设计

在研究粗波分复用（CWDM）技术和波长转换技术的基础上，设计了一个适用于CWDM系统的波长转换器模块。该模块支持8个CWDM信道，可工作于多速率状态。模块除内部具有3R功能还具有激光器偏流指示、发送功率指示、激光器关断控制、接收功率指示、低输入功率告警指示和速率选择等功能。实验结果表明，该模块较好地实现了波长的转换，具有较高的稳定度和实用性．     

Computer-aided design of toroidal air-core inductors for highenergy levels

A method is presented for the design of inductors that recurrently store a substantial amount of electric energy; joules with frequencies in the order of tens of kHz. The objective of this method arose from the necessity of designing air-core inductors as part of an electronic conversion circuit for the control and transfer of electric energy in the submegawatt range. For specific geometrical configurations, design criteria such as weight and electrical losses (or a compromise between them) in combination with the thermal behavior are calculated. An analysis of the design criteria for a normalized inductive storage element is introduced and applied to a computer-aided design method. The computer program provides either the design of a new core or the design of an inductor on an available air-core arrangement, reducing the time for calculation     

Automatic locomotion design and experiments for a Modular robotic system

This paper presents a design method and experiments for whole-body locomotion by a modular robot. There are two types of locomotion for modular robots: a repeating self-reconfiguration and whole-body motion such as walking or crawling. For whole-body locomotion, designing a control method is more difficult than for ordinary robots because a modular robotic system can form various configurations, each of which has many degrees of freedom. This study proposes a unified framework for automatically designing an efficient locomotion controller suitable for any module configuration. The method utilizes neural oscillators (central pattern generators, CPGs), each of which works as a distributed joint controller of each module, and a genetic algorithm to optimize the CPG network. We verified the method by software simulations and hardware experiments, in which our modular robotic system, named M-TRAN II, performed stable and effective locomotion in various configurations.     

Modular design principles for protocols with an application to thetransport layer

A method for specifying services, specifying protocols, and constructing protocol specifications by stepwise refinement of service specifications is presented. The method is based on assertional reasoning and a refinement relation between state transition systems. The method is demonstrated on the transport layer, which is used by application protocols such as electronic mail, file transfer, remote login, etc. A succession of specifications is constructed, starting from a very abstract transport service and culminating in specific transport protocols comparable to TCP and ISO TP4. Each specification offers both connection management and connection-specific data transfer. It is shown how any connection-independent data transfer protocol can be transformed to offer connection-specific data transfer service     

Modular design methodologies for image processing architectures

A methodology for the design of modular and optimized architectural blocks for the generation of local windows of pixels is presented. The proposed formalization and the related techniques follow a design approach derived from the window-based algorithmic decomposition of low- and medium-level image processing algorithms     

Atom specific multiple kernel dictionary based Sparse Representation Classifier for medium scale image classification

Kernel based Sparse Representation Classifier (KSRC) can classify images with acceptable performance. In addition, Multiple Kernel Learning based SRC (MKL-SRC) computes the weighted sum of multiple kernels in order to construct a unified kernel while the weight of each kernel is calculated as a fixed value in the training phase. In this paper, an MKL-SRC with non-fixed kernel weights for dictionary atoms is proposed. Kernel weights are embedded as new variables to the main KSRC goal function and the resulted optimization problem is solved to find the sparse coefficients and kernel weights simultaneously. As a result, an atom specific multiple kernel dictionary is computed in the training phase which is used by SRC to classify test images. Also, it is proved that the resulting optimization problem is convex and is solvable via common algorithms. The experimental results demonstrate the effectiveness of the proposed approach.     

基于RFID的小型天线的设计

915 MHz频段是RFID常用的频段之一,本文设计了一款该频段下工作的RFID天线,并借助ANSOFT HFSS计算软件对天线系统进行了仿真分析,通过对贴片以及接地板开槽,使天线在保持高增益的情况下,在更宽的频带上具有更好的稳定性,同时也减小了天线的尺寸,使天线整体性能更加完善。     

一种小规模超宽带相控阵天线设计

目前基于阵元间强耦合效应已设计出超宽带相控阵天线,但是其规模较大。针对规模小或者在扫描方向上规模小,如何增强阵元间耦合而实现超宽带相控阵天线的问题,采用平衡对踵Vivaldi天线(BAVA)作为天线单元,优化天线单元辐射金属的形状,并采用镜像法布阵天线单元设计出一个小规模4×16的斜极化超宽带相控阵天线。仿真和试验结果表明,采用的方法可以增强小规模超宽带相控阵天线的阵元间耦合效应,实现频率0.8f0~2.0f0驻波比小于2,法向增益达17.34~23.0 dBi,在±45°范围内实现无栅瓣扫描。该小规模超宽带相控阵天线已在实际工程中应用。     

中小电视台全媒体内容生产网安全设计

介绍了中小电视台在搭建全媒体内容生产平台中,网络安全如何进行设计.通过入口安全、系统安全、出口安全这种分段式的安全设计来实现网络安全,实现生产网数据安全保护.详细介绍了全媒体生产网络入口安全设计、系统安全设计和出口安全设计,为中小电视台全媒体生产平台安全建设提出了一种全新的安全管控方式.     

小孔径超视距目标探测中的OFD-NLFM发射波形设计

针对小孔径超视距目标探测时阵列孔径减小空域滤波性能下降的问题,提出了一种正交频分非线性调频（OFD-NLFM）的发射波形设计方法。首先以正切调频函数为频率函数对发射信号进行建模,详细说明了影响脉压性能的正切函数时间副瓣电平控制因子的选择方法,重点提出一种基于凸优化的脉压信号峰值旁瓣抑制算法,建立了脉压输出噪声功率最小的优化模型并进行求解。仿真表明,提出的正交频分非线性调频信号具有较好的正交性,采用凸优化加权算法后脉压主瓣宽度比传统线性调频信号降低约1/3,峰值旁瓣为-31.22 dB,旁瓣电平平均值小于-100 dB,具备更低的抗噪声和干扰性能,从波形设计和脉压处理角度改善了空域滤波性能的不足。     

Modular analysis and design of log-domain circuits based on LIN↔ELIN transformations

We systematized and developed some procedures for the modular design of externally-linear internally nonlinear (ELIN) circuits resulting in a general LIN↔ELIN transformation procedure. This one was also extended to analysis of these types of circuits. The procedure is exemplified on log-domain circuits. In the design one starts with the linear block diagram (LIN) described by transfer functions and one substitutes directly each linear building block by a corresponding nonlinear one. The parameters of each nonlinear component depend on the given parameters of its linear correspondent. Input F ⁻¹ and output F blocks are added. In the analysis one identifies the nonlinear basic circuit components and each of them is substituted by its corresponding linear building block. Input and output F ⁻¹-F cells are removed. The ideal transfer function can be calculated on the linear block diagram now. The LIN↔ELIN transformations make a direct connection between equivalent linear and ELIN circuits, simplify their design and analysis procedures and permit the development of CAD procedures.     

An investigation of superconducting magnets for a 10 MWh SMES

Superconducting magnetic energy storage (SMES) systems are analyzed with respect to the potential impact of advancing materials technology. The effects of increased superconductor current density, magnet operating temperature and structural material strength are evaluated. For relatively low-field (<17-T) coils, NbTi and Nb₃ Sn are used. For higher magnet fields and operating temperatures, the ceramic oxide BiSrCaCuO is anticipated in the near term (within 5-10 years). Advanced structural materials are also considered. These include cryogenic steels, maraging steels, and titanium alloys. Of these, Incoloy 908 (a cryogenic steel) is found to be the most suitable material for a small SMES system. The impact of fiber-reinforced steel composites is also evaluated. If all of the advances discussed become available (increased current density, operating temperature and allowed stress), the net conductor, structure and cryogenic cost of 10-MWh SMES systems may be reduced by over 45% relative to presently available technology     

Tests on a 200 kA cable-in-conduit conductor for SMES application

This paper describes the tests conducted to characterize the performance of the 200 kA conductor used in the Bechtel Team's SMES (superconducting magnetic energy storage) design. The CICC-type conductor was tested at operating temperature (1.8 K) and field by placing the sample in the bore of a dipole magnet and simultaneously ramping the current and the background field to simulate operation along the load line. The test sample and its return cables were the secondary of a superconducting transformer rated at 300 kA. Two test series were conducted with slightly different samples: one in which the cable had been soldered, the other without the solder. In both cases, the first quench along the load line occurred at 110% of the rated operating current. The training behavior and the observed critical current curve were slightly different for the samples. The tests validated the conductor design for application in the SMES coil, and also yielded a world record in current through a superconductor, reaching 303 kA along the 4.5 tesla load line