The application of computer simulation technique to electronic controlled fuel injection(EFI) engine was studied to increase the development speed and improve the overall performance of the engine and car. On the bas...The application of computer simulation technique to electronic controlled fuel injection(EFI) engine was studied to increase the development speed and improve the overall performance of the engine and car. On the basis of an EFI system developed by ourselves, the simulation model of the initial control data and engine operation points during a driving cycle and the car performance pridiction model were established. This method was applied to a mini car. The experiment showed that the simulated control data has good accuracy; and the engine test points and car performances obtained by simulation are useful for the matching of EFI system with gasoline engine and the development speed is increased.展开更多
对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个...对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个层次出发,提出了一种基于USB Key启动、动态口令手机令牌和EFI安全防护软件的三层安全加固的方案。将EFI OS Loader文件存放在USB Key中并加密,实现对文件的保护;把动态口令认证服务端置于USB Key中,两者的有机结合实现了高强度的开机身份认证;设计并开发了遵循UEFI规范的EFI应用程序型安全防护软件,实现了对系统关键区域的保护。实验结果表明,该方案的双认证与安全防护机制弥补了相关安全漏洞,增强了计算机系统启动过程的安全性。展开更多
文摘The application of computer simulation technique to electronic controlled fuel injection(EFI) engine was studied to increase the development speed and improve the overall performance of the engine and car. On the basis of an EFI system developed by ourselves, the simulation model of the initial control data and engine operation points during a driving cycle and the car performance pridiction model were established. This method was applied to a mini car. The experiment showed that the simulated control data has good accuracy; and the engine test points and car performances obtained by simulation are useful for the matching of EFI system with gasoline engine and the development speed is increased.
文摘对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个层次出发,提出了一种基于USB Key启动、动态口令手机令牌和EFI安全防护软件的三层安全加固的方案。将EFI OS Loader文件存放在USB Key中并加密,实现对文件的保护;把动态口令认证服务端置于USB Key中,两者的有机结合实现了高强度的开机身份认证;设计并开发了遵循UEFI规范的EFI应用程序型安全防护软件,实现了对系统关键区域的保护。实验结果表明,该方案的双认证与安全防护机制弥补了相关安全漏洞,增强了计算机系统启动过程的安全性。
