Design of Feedback Shift Register of Against Power Analysis Attack

Stream ciphers based on linear feedback shift register (LFSR) are suitable for constrained environments, such as satellite communications, radio frequency identification devices tag, sensor networks and Internet of Things, due to its simple hardware structures, high speed encryption and lower power consumption. LFSR, as a cryptographic primitive, has been used to generate a maximum period sequence. Because the switching of the status bits is regular, the power consumption of the LFSR is correlated in a linear way. As a result, the power consumption characteristics of stream cipher based on LFSR are vulnerable to leaking initialization vectors under the power attacks. In this paper, a new design of LFSR against power attacks is proposed. The power consumption characteristics of LFSR can be masked by using an additional LFSR and confused by adding a new filter Boolean function and a flip-flop. The design method has been implemented easily by circuits in this new design in comparison with the others.     

振动时效动力学研究

多次扫频法是进行振动时效机一研究的一种简便而有效的方法。在梁形构件上进行试验，得到一组扫频曲线，以此为依据进行了分析，揭示了振动时效过程的动力学曲线呈“几”字型变化规律，以及剪切应力在振动晨效中所起的重大作用。在此基础上提出了一个现场评定振地效效果的定性判据。     

Stability analysis of constrained MPC with CLF applied to discrete-time nonlinear system

The problem of counting the number of spanning trees is an old topic in graph theory with important applications to reliable network design. Usually, it is desirable to put forward a formula of the number of spanning trees for various graphs, which is not only interesting in its own right but also in practice. Since some large graphs can be composed of some existing smaller graphs by using the product of graphs, the number of spanning trees of such large graph is also closely related to that of the corresponding smaller ones. In this article, we establish a formula for the number of spanning trees in the lexicographic product of two graphs, in which one graph is an arbitrary graph G and the other is a complete multipartite graph. The results extend some of the previous work, which is closely related to the number of vertices and Lapalacian eigenvalues of smaller graphs only.     

Stability analysis of constrained MPC applied to discrete-time nonlinear with CLF system

The model predictive control （MPC） strategy with a control Lyapunov function （CLF） as terminal cost is commonly used for its guaranteed stability. In most of the cases, CLF is locally designed, and the region of attraction is limited, especially when under control constraints. In this article, the stability and the region of attraction of constrained MPC that is applied to the discrete-time nonlinear system are explicitly analyzed. The region of feasibility is proposed to substitute the region of attraction, which greatly reduces the calculation burden of terminal constraints inequalities and guarantees the stability of the MPC algorithm. Also, the timevariant terminal weighted factor is proposed to improve the dynamic performance of the close-loop system. Explicit experiments verify the effectiveness and feasibility of the relative conclusions, which provide practically feasible ways to stabilize the unstable and/or fast-dynamic systems.     

加强木材工业环境治理促进木工机械发展

随着木材工业的快速发展,各种污染环境的公害相应产生,严重地破坏了环境,危及了人们的身体健康,同时,也困扰着木材工业和木工机械的发展,采取各种措施加强对环境治理已到了刻不容缓的地步.     

汽车指针仪表的视觉检测系统的研究与设计

研究了一种基于机器视觉的汽车仪表盘自动检测系统。该系统通过机器视觉的方法,采用OpenCV编程环境,采集有效的汽车指针仪表盘图像,并对其进行处理,识别出仪表刻度值与指针的位置和重合程度,从而判定仪表指示准确性是否符合要求。系统包含了光源的配置、摄像头的选取和其横纵竖三向的移动、图像的预处理以及图像的识别判定等部分。测试证明,该系统能有效地自动读出指针仪表的示数并判断其是否准确,识别速度和精确度与国外类似产品相比得到了提升。     

木工机床保护接地电路的设计与测试

针对我国木工机床普遍存在的保护接地设计不规范问题,介绍了各种供电系统下木工机床的接地连接方式,分析了木工机床保护接地电路设计应注意的一些问题。同时,对保护接地电路连续性的测试方法进行了说明。     

基于DDS的波形发生器在HIRFL—CSR电源控制系统中的应用

文章介绍了一种以直接数字频率合成（DDS）技术为基础的波形发生器，设计了硬件电路，并给出了主要的电路原理图．给出了软件流程图和部分核心软件代码。该波形发生器应用在加速器磁铁电源控制系统中，用采产生控制电源所需要的波形信号．本文中的设计对于需要用波形信号来控制设备的系统具有普遍的实用价值。     

溶液表面张力检测处理软件的设计

在最大气泡法测定溶液表面张力的实验中,用VC＋＋6．0开发了溶液表面张力联机检测处理软件,实现了微机与DP-AW精密数字微压差计之间的数据通讯、压差-时间曲线的自适应滚动显示、表面张力-浓度关系的非线性拟合和表面吸附量-浓度关系的快速获取。该软件已在教学中使用。使用结果表明,该软件计算数据准确、操作方便灵活、用户界面友好,可作为为计算机辅助教学的有力工具。     

大气等离子喷涂TiB2-TiC-Co涂层的组织与性能

利用Co-Ti-B4C自蔓延体系合成TiB2-TiC-Co复合陶瓷粉末，并结合大气等离子喷涂技术在Q235 钢基体表面制备TiB2-TiC-Co陶瓷涂层，研究了自蔓延产物和涂层的相组成、显微组织，以及涂层的结合强度和抗磨损性能。结果表明：Co-Ti-B4C体系自蔓延产物的物相中，除了少量剩余的NaCl添加剂衍射峰外，主要由TiB2和TiC陶瓷相的强衍射峰组成；产物断面中，两相陶瓷颗粒细小。随Co含量增加，TiB2-TiC-Co涂层表面盘状组织增多，表面逐渐平滑，截面涂层厚度均匀，组织致密性逐渐增加；结合强度和耐滑动磨损性能呈先升高后降低的变化趋势。Co含量为10wt.%时，涂层的结合强度和耐滑动磨损性能最好，涂层的滑动磨损机制主要为粘着磨损和层状剥落磨损。