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Search Results: 1 - 10 of 117496 matches for " 唐立军 "
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教育电子身份认证系统的安全策略研究
A Study on Security Strategies of Educational Electronic Identity Authentication System
 [PDF]

周庆华, 刘磊, 文勇, 俊龙,
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.66043
Abstract: 教育电子身份认证系统涵盖了以e2ID提供认证服务的教育应用系统日常运行的方方面面,因而保障其安全、稳定地运行显得尤为重要。本文分析了教育电子身份认证系统存在的各种安全隐患,从管理和技术两方面提出了保障教育电子身份认证系统安全、稳定运行的安全策略。
The authentication system of educational electronic identity covers various aspects in daily oper-ations of educational application system in which authentication is served by e2ID. Therefore, its security assurance and steady operation are extremely important. This paper analyzes a variety of security risks in the educational electronic identity authentication system, and puts forward safety strategies from both the management and technical measures.
基于教育电子身份号的关联认证
Education Electronic Identity Based on the Related Certification
 [PDF]

文勇, 李程, 王键, 樊志良, 俊龙,
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.65032
Abstract: 针对多个应用系统组成的集成平台,用教育电子身份号(e2ID)研究实现关联认证,通过单点登录、实名制访问多应用系统,节省了网络资源,提高了访问效率。经在湖南省教育厅湘教云平台应用测试,该方法在不改变原用户体系独立运行模式的基础上,能够实现各独立应用系统之间的资源整合,并具有高并发情况下的快速响应能力。
A multi-application systems integration platform has been achieved via associated certification of Education Electronic Identity. Therefore, the network resources are saved and the efficiency of access is improved through Single Sign-On and real-name to access multi-application systems. The Education Department of Hunan Province Xiang Teaching Cloud tests demonstrates that this me-thod doesn’t change the independent operating mode of original user system, realizing the resource integration among various independent applications and keeping the ability to respond quickly under high concurrency at the same time.
开关磁阻电机速度控制
Speed Control Strategy of Switched Reluctance Motor
 [PDF]

杜舟, 吴定祥,
Journal of Electrical Engineering (JEE) , 2016, DOI: 10.12677/JEE.2016.41008
Abstract:
针对开关磁阻电机的调速控制系统的起动方式和速度控制开展研究,采用两相绕组通电起动的方式,以增大转矩、减小转矩脉动。提出了模糊–自适应整定PID控制算法,并以STM32 + FPGA为主控制器,应用低速电流斩波、高速角度位置控制方式设计了开关磁阻电机调速系统。对于解决超调量高、动态响应慢的不足、精确度不高的问题有一定的效果。实验结果表明,系统转速的精确度在10 r/min之内,最大超调量为15 r/min。
Aimed at research on starting mode and speed control of switched reluctance motor speed control system, a two-phase starting is adopted to start the electric, in order to increase the torque and reduce the torque ripple. A fuzzy adaptive PID control algorithm is proposed, and a switched reluctance motor speed control system with STM32 + FPGA as the main controller is designed, applying current chopping in low speed and angle position control mode in high speed, which has a certain effect on solving the problems of high overshoot, slow dynamic response and low accuracy. The experimental results show that the precision of the system speed is within 10 r/min, and the maximum overshoot is 15 r/min.
基于Linux Qt技术可视化网关系统
Visualization Gateway System Based on Linux Qt Technology
 [PDF]

温建, , 林中川, 邓敏, 宾峰, 王永健, 刚煜
Computer Science and Application (CSA) , 2015, DOI: 10.12677/CSA.2015.54014
Abstract:
针对远程实验室平台控制需求,提出了一种基于Linux Qt平台可视化管理的网关系统设计方案,设计实现了一种基于嵌入式的C/S模式的可视化网关系统。该系统采用Cortex-A9四核的Exynos 4412芯片作为处理核心,以嵌入式Linux Qt平台作为本地服务端与远程的客户端,通过串口和网口采集Zigbee网络传感器的数据,结合嵌入式Linux操作系统、Zigbee技术及网络传输,利用开源的图形界面库Qt开发界面程序。系统综合考虑了局域网内各种传感器设备的接入,可方便与外界网络信息交换。
Aiming at the requirement of laboratory platform for remote network control, we propose a de-signing scheme of visualization gateway system based on Linux Qt platform, and realize a visuali-zation gateway system based on the embedded C/S mode. The system adopts the Cortex-A9 quad- core Exynos 4412 chip as the processor cores, uses embedded Linux Qt platform as the local server and remote client, collects Zigbee network sensors’ data via the serial port and Ethernet port, and combining with embedded Linux operating system, Zigbee technology and network transmission, uses open source interface library Qt to develop interface program. The system synthetically considers the access of a variety of sensor devices in LAN, and can easily exchange the information with the outside network.
海冰板的环形屈曲的压缩破坏
,陈会
海洋工程 , 2001,
Abstract: 在轴对称条件下,给出海冰板的环向屈曲面临载荷,从细观力学的观点分析了微裂纹开裂的条件,扩展方向并给出绕海洋平台柱腿冰的损伤区的尺度。所给出的临界半径是一个与冰材料力学特征,冰的微结构参数一海洋平台柱腿半径相关的特征参数。对现场所观察和测量的结构给出了解释和定量分析。
hec固化剂加固膨胀土试验研究
,雪云
人民黄河 , 2010,
Abstract: ?通过不同条件下的膨胀性试验、剪切试验、无侧限抗压强度试验等对hec改良膨胀土的工程性质进行了试验研究.结果表明:hec固化土的物理力学性质得到大幅度提高,膨胀土膨胀潜势基本消失;hec可极大地提高土体的强度,且随着固化剂含量的增加,其抗剪强度逐渐增大,无侧限抗压强度也逐渐提高;hec固化土耐崩解性好,相同成型试件条件下,hec加固土的密实程度得到明显改善和提高.
压力敏感性材料准静态扩展裂纹尖端场
麻文,
哈尔滨工程大学学报 , 2009,
Abstract: 为了研究压力敏感性材料的准静态扩展裂纹尖端场,建立了压力敏感性材料准静态扩展裂纹的力学模型.在稳态扩展阶段,应力和应变具有相同的奇异量级,即(or,s)*r““””.引入Airy应力函数,通过渐近分析得出了裂纹尖端应力和应变的分离变虽形式的渐近解,并采用双参数打靶法求得了裂纹尖端应力和应变的数值结果.数值计算结果表明,裂尖场主要受材料的泊松比l,和幂硬化指数n的控制.通过对裂纹尖端场的渐近分析,从应变角度出发,提出了压力敏感性材料准静态扩展裂纹的断裂判据.
DES和LFSR混合加密的研究与FPGA实现
Research on Mixed Encryption of DES and LFSR and FPGA Implementation
 [PDF]

刚煜, 文勇, 邓敏, 夏伟轩, 宾峰, 廖文平,
Computer Science and Application (CSA) , 2015, DOI: 10.12677/CSA.2015.54016
Abstract:
随着网络信息交流量日益增长,信息安全问题成了网络资源应用的发展瓶颈。本文针对计算机与网络上文件的安全性问题,对DES算法以及LFSR密码生成算法进行研究,设计了基于DES和线性反馈移位寄存器(LFSR)的混合加密算法并通过FPGA实现,FPGA根据用户输入的密码组合,通过线性反馈移位寄存器产生一串密钥,然后通过USB将这串密钥发送至计算机中。上位机软件实现与下位机的USB通讯、用DES算法对任意文件进行加密和解密的功能。结果表明,该方案对任意文件加密效果好、速度较快,对于网络空间文件保护有较好的效果。
With the growing of network information, the issue of information security has become the bot-tleneck of the development of network source application. This paper aimed at file’s security in the computer and Internet, and researched on DES encryption algorithm and the algorithm of LFSR. Based on above algorithms, we designed a mixed encrypted method realized by FPGA; according to the password combination that is inputted by the user, a bunch of keys will be produced by LFSR and sent to computer by USB. The function of software on the computer is communicating with USB chip and encrypting files with DES algorithm. The results showed that this scheme has good effect and high processing speed on encrypting any certain files, and has a good effect for protecting files on network space.
石英挠性加速度计表头行为模型研究
Study of Behavior Model of Quartz Flexible Accelerometer Header
 [PDF]

商梅雪, 贺慧勇, , 赵鹏, 刚煜, 周鹏毅, 王永建
Journal of Electrical Engineering (JEE) , 2016, DOI: 10.12677/JEE.2016.41011
Abstract:
针对石英挠性加速度计PID参数整定繁琐、读出电路新方案的验证平台搭建复杂等问题,开展了对石英挠性加速度计表头的工作原理以及数学模型的分析,设计了加速度计表头的行为模型。搭建了相应的验证平台,将所得的表头行为模型的开环阶跃响应与实际表头做对比,验证了该行为模型的正确性。将该行为模型与表头的读出电路进行联合仿真,实现了表头模型和读出电路的闭环,并分析了不同PID参数对系统的调节时间等闭环动态响应特性的影响以及在特定PID参数下系统的?3 dB带宽。本表头行为模型可用于研究表头读出电路的设计、整定读出电路的PID参数以及分析读出电路的性能指标等多个方面。
For cumbersome tuning of quartz flexible accelerometer PID parameters, complex building of readout circuit’s new program verification platform and other issues, analysis of the quartz flexible accelerometer meter works and mathematical model was carried out, and accelerometers header behavioral model was designed. We set up the appropriate verification platform, compared the open loop step response of the resulting header behavior model with the actual header, and verified the correctness of the behavior of the model. A joint simulation was done combining the behavioral model with the read-out circuit header, to realize the closed loop of header model and readout circuit, and the influence of different PID parameters on the closed-loop dynamic response characteristics such as system accommodation time, and ?3dB bandwidth of particular PID parameters of the system were analyzed. The header behavior model can be used to study the meter readout circuit design, setting PID parameter of the readout circuit and analyze the performance index of the readout circuit and other aspects.
直流电流作用下AZ91D镁合金半固态等温处理过程中的组织演变
周全,杨院生,,胡壮麒
金属学报 , 2006,
Abstract: 考察了直流电流密度、等温温度及等温时间对AZ91D镁合金半固态组织的影响,对电流影响组织演变的机理进行了探讨。实验结果表明当等温温度和等温时间一定时,随着电流密度的增加,初生相变得圆整,初生相的尺寸有所减小。但电流密度过高时,初生相尺寸有所增加。直流电流可以加速半固态等温处理的组织演化过程,明显改善枝晶球化效果。直流电流增加扩散激活能,增大溶质原子的扩散系数,促进溶质原子的扩散,从而加速半固态等温过程的组织演化;直流电流作用下的电迁移效应、Joule热效应和Peltier效应都将促进枝晶的熔断和球化。
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