设备内热源的红外无损辨识研究

用逐层比较的方法对二维内热源及其温度场分布进行了重构,通过数值试验验证了该方法的正确性.通过对计算结果的分析,发现该方法能够很好的用于内热源的重构以及任何一类反问题的求解.当测量结果精度较高时,该方法的计算结果非常准确.因此,可通过热电偶测量和红外扫描相结合的方法,来提高测量准确性,以达到较好的辨识结果.     

单元测试在软件开发过程中的作用

单元测试是整个软件开发过程中的一个重要环节。执行一个完备的单元测试方案将会提高整个开发过程的时间效率,验证软件功能与详细设计说明的一致性,能确保集成测试的有效性和提高软件开发的成本效率。     

A hierarchical test generation methodology for digital circuits

A new hierarchical modeling and test generation technique for digital circuits is presented. First, a high-level circuit model and a bus fault model are introduced—these generalize the classical gate-level circuit model and the single-stuck-line (SSL) fault model. Faults are represented by vectors allowing many faults to be implicitly tested in parallel. This is illustrated in detail for the special case of array circuits using a new high-level representation, called the modified pseudo-sequential model, which allows simultaneous test generation for faults on individual lines of a multiline bus. A test generation algorithm called VPODEM is then developed to generate tests for bus faults in high-level models of arbitrary combinational circuits. VPODEM reduces to standard PODEM if gate-level circuit and fault models are used. This method can be used to generate tests for general circuits in a hierarchical fashion, with both high- and low-level fault types, yielding 100 percent SSL fault coverage with significantly fewer test patterns and less test generation effort than conventional one-level approaches. Experimental results are presented for representative circuits to compare VPODEM to standard PODEM and to random test generation techniques, demonstrating the advantages of the proposed hierarchical approach.     

对SoC芯片全面验证的仿真结构的研究

研究构成仿真环境的策略及软硬件协同验证环境的接口实现,介绍了用于功能和性能验证的软件伪随机测试生成方法.该方法对SoC和复杂的板机系统进行可测性设计的优化验证,大大降低测试成本,缩短了系统开发周期.     

针对虚拟机查毒的规避方法研究

如今杀毒软件利用虚拟机模拟执行程序,判断其行为是否会对系统安全造成影响,从而由用户决定是放行通过或是报警拦截。针对虚拟机查毒的特点,研究如何检测杀毒软件的虚拟机环境。根据虚拟机环境与真实用户环境的区别,以及特定杀毒软件虚拟机的特有属性,找到规避虚拟机模拟执行的方法,从而使程序不被杀毒软件虚拟执行,欺骗杀毒软件直接放行通过,用来满足某些特定程序的要求。     

激光器出口散射测试和影响分析

介绍了激光制导半实物仿真中1064 nm激光散射微弱能量的测试方法.并对某激光器出口散射进行了测试分析,总结了其分布规律,并建立模型.结果表明,激光器出12散射角度较广,且在近场散射能量比大气气溶胶散射能量高几倍,而远场时散射能量又明显低于大气气溶胶散射能量.因此,在近场仿真实验中,需要采取光阑遮挡等相应措施,合理处理...     

用于焦平面测试系统的高效高精度数据采集方法与实现

通过分析焦平面测试中各种性能参数对数据要求的特点,提出了一种区别于传统的高效数据采集方法,并采用ADI最新发布的16位高性能ADC,设计了基于该方法的高效高精度采集系统.通过内嵌的“RMS硬件算法”和外部SRAM的特殊组合,在兼容传统测试系统的同时,大大提高了系统的测试效率.经碲镉汞(HgCdTe)型640×512(1...     

电磁兼容自适应扫描系统的研制

针对近场测试系统的市场需求及该系统在国内相关领域的研究空白,设计并实现了一款新型电磁兼容扫描系统。该系统可对PCB板、线缆、机箱等被测设备进行全局扫描、局部扫描或自适应扫描,并以三维彩色图形的形式显示被测设备的电磁辐射状态,实现电磁场＂可视化＂。提出了＂自适应扫描＂原理,设计并实现了步进长度可调整的自适应式扫描的技术方案,从而达到节省扫描时间、提高效率并降低成本的效果。     

ATE射频测试板低成本解决方案

近年来国内无线通讯市场发展迅猛,射频芯片的出货量也快速增长,射频芯片不同于其他SoC芯片,往往是市场周期短,更新速度快,这给芯片的量产测试带来挑战,ATE射频测试板作为测试的重要组件,成为制约测试开发和成本的最关键因素,ADVANTEST推出的低成本射频测试板兼顾了开发效率和测试成本的平衡性,给射频芯片的量产测试带来了...     

Markov game modeling of mimic defense and defense strategy determination

Network mimic defense technology enhances the robustness of active defense through the redundancy,dynamic and diversity as well as the decision feedback mechanism.However,little work has been done for its security assessment and existing classic game models are not suitable for its dynamic characteristics and lack of universality.A Markov game model was proposed to analyze the transfer relationship between offensive and defensive status and the measurement method of safety and reliability of mimic defense,and calculated the offensive and defensive game equilibrium through non-linear programming algorithm to determine the best defensive strategy considering performance.Experiments give a comparison with the multi-target hiding technique and shows that the mimic defense has a higher defensive effect.Combining with the specific network case,the specific attack and defense path for the exploit of the system vulnerability is given and the effectiveness of the defense strategy algorithm is verified.