XiaoMi-AI文件搜索系统
World File Search System参考电压
chip-off-forensic_dfrws17.pdf - 卡内基梅隆大学
数字取证调查员通常需要从包含 NAND 闪存的被扣押设备中提取数据。许多此类设备都受到物理损坏，导致调查员无法使用自动化技术提取设备中存储的数据。相反，调查员转向芯片分析，他们使用基于热的程序从设备中物理移除 NAND 闪存芯片，并直接访问芯片以提取存储在芯片上的原始数据。我们对设备被扣押后引入多层单元 (MLC) NAND 闪存芯片的错误进行分析。我们有两个主要观察结果。首先，在设备被扣押和数字取证调查员进行数据提取之间，由于 NAND 闪存单元的电荷泄漏（称为数据保留错误），可能会引入大量错误。其次，当执行基于热的芯片移除时，由于施加到芯片上的高温大大加速了电荷泄漏，NAND 闪存中存储的数据中的错误数量可能会增加两个或更多个数量级。我们证明基于芯片分析的法医数据恢复程序具有相当大的破坏性，并且通常会导致 NAND 闪存中的大部分数据无法纠正，从而无法恢复。为了减轻法医恢复过程中引入的错误，我们探索了一种新的基于硬件的方法。我们利用现代 NAND 闪存芯片中实现的一种细粒度读取参考电压控制机制，称为读取重试，它可以补偿由于 (1) 保留损失和 (2) 基于热的芯片移除而发生的电荷泄漏。读取重试机制成功减少了错误数量，只要芯片在被扣押前没有被大量使用，原始数据就可以在我们测试的芯片中完全恢复。我们得出结论，读取重试机制应该作为法医数据恢复过程的一部分。© 2017 作者。由 Elsevier Ltd 代表 DFRWS 发布。这是一篇根据 CC BY-NC-ND 许可证开放获取的文章（ http://creativecommons.org/licenses/by-nc-nd/4.0/ ）。
并网光伏系统三相逆变器基于无源性的黎曼刘维尔分数阶滑模控制
由于环境条件多变，光伏 (PV) 系统参数始终是非线性的。在多种不确定性、干扰和时变随机条件的发生下，最大功率点跟踪 (MPPT) 很困难。因此，本研究提出了基于被动性的分数阶滑模控制器 (PBSMC)，以检查和开发 PV 功率和直流电压误差跟踪的存储功能。提出了一种独特的分数阶滑模控制 (FOSMC) 框架的滑动面，并通过实施 Lyapunov 稳定性方法证明了其稳定性和有限时间收敛性。还在被动系统中添加了额外的滑模控制 (SMC) 输入，通过消除快速不确定性和干扰来提高控制器性能。因此，PBSMC 以及在不同操作条件下的全局一致控制效率是通过增强的系统阻尼和相当大的鲁棒性来实现的。所提技术的新颖之处在于基于黎曼刘维尔 (RL) 分数阶微积分的 FOSMC 框架的独特滑动曲面。结果表明，与分数阶比例积分微分 (FOPID) 控制器相比，所提控制技术可在可变辐照度条件下将 PV 输出功率的跟踪误差降低 81%。与基于被动性的控制 (PBC) 相比，该误差降低 39%，与基于被动性的 FOPID (EPBFOPID) 相比，该误差降低 28%。所提技术可使电网侧电压和电流的总谐波失真最小。在不同太阳辐照度下，PBSMC 中 PV 输出功率的跟踪时间为 0.025 秒，但 FOPID、PBC 和 EPBFOPID 未能完全收敛。同样，直流链路电压在 0.05 秒内跟踪了参考电压，但其余方法要么无法收敛，要么在相当长的时间后才收敛。在太阳辐射和温度变化期间，使用 PBSMC，光伏输出功率在 0.018 秒内收敛，但其余方法未能收敛或完全跟踪，与其他方法相比，由于 PBSMC，直流链路电压的跟踪误差最小。此外，光伏输出功率在 0.1 秒内收敛到参考功率
使用日产叶的车辆到负载系统的设计和模拟
图3-11：MATLAB SIMULINK模拟设计的电池。 .................... 40 Figure 3-12 MATLAB SIMULINK simulation of battery comparison. ................. 41 Figure 3-13: SOC results of comparison simulation................................................ 42 Figure 3-14: OCV results of first order RC batteries comparison. ...............................................................................................................................................................................................................................................................................................................................................................................................二阶RC电池比较的OCV结果。 ..................... 43 Figure 4-1 Traditional bridge-type PWM inverter. （a）拓扑。 （b）波形[30]。 .......................................................................................................................... 45 Figure 4-2 LC Filter equivalent circuit. ................................................................... 46 Figure 4-3: The V2L electrical circuit. .................................................................... 49 Figure 4-4: The equivalent circuit of the V2L system. ............................................ 49 Figure 4-5 Bode Plot of the voltage plant. ............................................................... 52 Figure 4-6: Bode Plot of the current plant. .............................................................. 53 Figure 4-7 the block diagram of the outer voltage control loop with the inner current loop. .......................................................................................................................... 54 Figure 4-8: MATLAB SIMULINK simulation of complete system. .................................................... 57 Figure 4-11 Inductor current result of the system. 。图3-11：MATLAB SIMULINK模拟设计的电池。.................... 40 Figure 3-12 MATLAB SIMULINK simulation of battery comparison.................. 41 Figure 3-13: SOC results of comparison simulation................................................ 42 Figure 3-14: OCV results of first order RC batteries comparison................................................................................................................................................................................................................................................................................................................................................................................................二阶RC电池比较的OCV结果。 ..................... 43 Figure 4-1 Traditional bridge-type PWM inverter. （a）拓扑。 （b）波形[30]。 .......................................................................................................................... 45 Figure 4-2 LC Filter equivalent circuit. ................................................................... 46 Figure 4-3: The V2L electrical circuit. .................................................................... 49 Figure 4-4: The equivalent circuit of the V2L system. ............................................ 49 Figure 4-5 Bode Plot of the voltage plant. ............................................................... 52 Figure 4-6: Bode Plot of the current plant. .............................................................. 53 Figure 4-7 the block diagram of the outer voltage control loop with the inner current loop. .......................................................................................................................... 54 Figure 4-8: MATLAB SIMULINK simulation of complete system. .................................................... 57 Figure 4-11 Inductor current result of the system. 。...............................................................................................................................................................................................................................................................................................................................................................................................二阶RC电池比较的OCV结果。..................... 43 Figure 4-1 Traditional bridge-type PWM inverter.（a）拓扑。（b）波形[30]。.......................................................................................................................... 45 Figure 4-2 LC Filter equivalent circuit.................................................................... 46 Figure 4-3: The V2L electrical circuit..................................................................... 49 Figure 4-4: The equivalent circuit of the V2L system............................................. 49 Figure 4-5 Bode Plot of the voltage plant................................................................ 52 Figure 4-6: Bode Plot of the current plant............................................................... 53 Figure 4-7 the block diagram of the outer voltage control loop with the inner current loop........................................................................................................................... 54 Figure 4-8: MATLAB SIMULINK simulation of complete system..................................................... 57 Figure 4-11 Inductor current result of the system.。...................... 55 Figure 4-9: Output voltage result of the system....................................................... 56 Figure 4-10: Output current result of the system.................................................... 57 Figure 4-12: PWM Waveforms of the system.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 58图4-14输出和参考电压....................................................................................................................................... 60 Figure 5-2: Experimental Setup............................................................................... 61 Figure 5-3: Experimental setup; （1）variac，（2）3-φ整流器，（3）控制器，（4）电阻载荷，（5）逆变器，（6）DSP板和电平换挡器电路，（7）示波器，（8）LC滤波器。..................................................................................... 61 Figure 5-4: The connection diagram of the F28335 processor and the level shifter................................................................................................................................... 63 Figure 5-5: Experimental Setup Connection of DSP board and the Level Shifter.64图5-6：无过滤器的逆变器的输出电压。...................................... 65 Figure 5-7: Load voltage and current....................................................................... 66 Figure 5-8: Load Voltage.............................................................................................................................................................................. 71........................................................................................ 66 Figure 5-9 Transient Current and Voltage of Kettle ................................................ 67 Figure 5-10 Transient Current and Voltage of Microwave ..................................... 67 Figure 5-11 Steady-State Current and Voltage of Kettle ......................................... 68 Figure 5-12 Steady-State Current and Voltage of Microwave ................................ 68 Figure 6-1 CHAdeMO Connector and Pin Layout [45].