一种智能卡口令认证方案的分析与改进

袁,吕提出了一种智能卡口令认证方案.在他们的方案中,用户能随意更改口令,远程系统不需要存储用户的口令表或验证表,并能防止重放攻击.作者指出袁-吕方案不能抵抗假冒攻击,并进行了改进.     

基于可信计算的智能卡安全保护框架设计

文中针对智能卡的安全现状,将可信计算思想引入智能卡的安全防护设计,讨论了可信计算思想在智能卡安全保护中的作用,并给出了一种具体的防护设计方法,使得智能卡在能够满足发展趋势要求的同时,具备了较高的安全性。     

Water-in-Oil-in-Water Nanoemulsions Containing Temulawak (Curcuma xanthorriza Roxb) and Red Dragon Fruit (Hylocereus polyrhizus) Extracts

Hydrophobic curcumin in temulawak extract and hydrophilic betacyanin in red dragon fruit extract are high-value bioactive compounds with extensive applications in functional food. In this study, these extracts were encapsulated in water-in-oil-in-water (w/o/w) nanoemulsions as a delivery system using a two-step high-energy emulsification method. PGPR and Span 20 were used as lipophilic emulsifiers for the primary w/o emulsion. The most stable w/o/w formulation with the least oil phase separation of 5% v/v consisted of w/o emulsion (15% w/w) and Tween 80 (1.5% w/w) as hydrophilic emulsifier. The formulation was characterized by a 189-nm mean droplet diameter, 0.16 polydispersity index, and –32 mV zeta potential. The freeze–thaw stability may be attributed to the combination of low w/o emulsion content and high Tween 80 concentration in the outer water phase of the w/o/w nanoemulsions used in this study. The IC₅₀ values of the nanoemulsion and the red dragon fruit extract were similar. It means that the higher concentration of curcumin in the nanoemulsions and the lower IC₅₀ value of temulawak extract ensured sufficient antioxidant activities of the w/o/w nanoemulsions.     

Performance of a sound card as data acquisition system and a lock-in emulated by software in capillary electrophoresis

The performance of fluorescence detectors in capillary electrophoresis is maximized when the excitation light intensity is modulated in time with optimal frequencies. This is especially true when photomultiplier tubes are used to detect the fluorescent light. The photomultiplier tube amplified raw output signal can in principle be captured directly by a personal computer sound card (PCSC) and processed by a lock-in emulated by software. This possibility is demonstrated in the present work and the performance of this new setup is compared with a traditional data acquisition system. The results obtained with this “PCSC and lock-in emulated by software” were of the same quality or even better compared to that obtained by conventional time integrators (Boxcars) and data acquisition boards. With PCSC the limits of detection (LOD) found for both naphthalene-2,3-dicarboxaldehyde-derivatized tyrosine and alanine were 3.3 and 3.5 fmol (injection of 5 nL of samples at 0.66 and 0.70 μmol/L), respectively. This is at least three times better compared to conventional systems when light emitting diodes (LEDs) are used as the excitation source in fluorescence detectors. The PCSC linear response range was also larger compared to conventional data acquisition boards. This scheme showed to be a practical and convenient alternative of data acquisition and signal processing for detection systems used in capillary electrophoresis.     

PC104总线雷达信号显示卡的设计与实现

PC104总线雷达信号显示卡是将基于PC104总线的虚拟仪器技术应用于通用雷达嵌入式诊断组合中信号的显示,对于改进雷达装备故障检测方式具有重大意义。通过对信号波形显示原理以及显示方法的分析,确定了具体的实际方案,完成了功能电路的设计;采用专用接口芯片结合CPLD的方法实现了PC104总线的接口协议以及逻辑控制电路,最后编写了相关的软件程序;显示卡在实际测试过程中能稳定工作,满足设计指标要求。     

FatFs在32位微控制器STM32上的移植

为了实现微控制器在大容量数据存取时的应用,可以采用外扩存贮器并移植文件系统的解决方案。本文介绍了FatFs文件系统在一款基于ARM Cortex M3的微控制器STM32上的移植,并简要描述了从电路的连接到FatFs底层函数的编写。     

融合地址簿系统关键技术研究

融合地址簿系统是对位于多种终端的多种用户地址进行综合管理的业务新技术,其显著优点是当任一联系人的信息改变时能够对所有本地地址簿进行及时更新,有效地解决地址数据的失效问题。本文研究了融合地址簿系统中数据同步更新和订阅的关键实现技术,给出了系统架构,并给出了系统的仿真测试。     

基于SOPC的音乐播放系统

提出了一种基于NiosII的音乐播放系统,主要实现通过对在SD卡存放的音频文件的读取操作,经过Avalon总线送至音频DAC电路播放音频文件。本设计基于SOPC技术,使用NiosII软核处理器实现,包括软硬件设计两个主要部分。硬件部分主要负责对WM8731和SD卡的ip核编写及调试以使其能挂在总线上,使硬件实现其功能。软件部分主要负责对SD卡按其时序进行音频文件的读取操作。     

基于无线局域网的矿下定位卡设计与实现

在无线局域网矿井定位系统中,定位卡是配置给矿井工作人员随身携带的嵌入式设备,应满足重量轻、体积小、抗干扰、低功耗等多方面的要求。文中从硬件和软件两方面对定位卡的设计与实现进行了叙述,同时提出了若干解决定位卡的非功能性要求的设计方法。     

基于CI接口的机卡分离条件接收系统设计与实现

通过比较实现CA系统的3个技术方案，引入DVB—CI公共接口概念并给出了CA系统中CI接口设计的框图，对公共接口协议作了简述，在此基础上完成CI接口的硬件设计和软件开发实现，简要介绍了对公共接口的扩展应用。