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基于FPGA设计的电子密码锁,运用EDA技术自顶向下的方法,采用硬件描述语言VHDL实现了密码锁的解锁、密码修改、报警提示及液晶显示功能。硬件测试结果表明,密码锁功能丰富、操作简单、安全性高、易于维护和升级。 相似文献
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指纹密码锁的设计采用的是以单片机AT89C52为主要的控制器,主要由液晶显示电路、指示(LED)电路、报警(蜂鸣器)电路,开锁电路等组成.指纹处理采用DSP芯片,通过proteus软件进行仿真,绘制PCB板,基于C51编写程序来实现指纹密码锁的功能.指纹密码锁可实现6位密码输入和指纹采集,密码或指纹正确则锁打开;修改密码和指纹需要二次确认,以防止误操作;解锁错误次数超过3次,蜂鸣器报警.设计此系统的密码锁具有较高的安全性和科学性. 相似文献
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电子银行客户密码安全保护策略的探讨 总被引:2,自引:0,他引:2
电子银行中对客户信息的保护一直是应用开发人员和银行客户非常关注的问题,也是电子商务系统能被信息社会广泛应用的一个非常重要因素。本文首先分析目前电子银行客户密码存在的安全问题,结合作者工作的实际设计了三种客户密码的保护策略与方法,实用结果表明这些方法有一定实际应用价值。 相似文献
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潘美莺 《赤峰学院学报(自然科学版)》2013,(3):54-55
本文通过全电子微机联锁系统的发展过程、构成及相应特点的研究,重点对解锁模块进行了深入的探究,对三种解锁的特殊功能进行浅谈,通过这一模块的研究,让我们增加了对联锁系统信号的解锁模块的了解. 相似文献
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实验报告作为记录学生实验信息的载体,能够反映学生的动手实践能力,是实验室管理中的重要部分.然而传统的实验报告管理办法已经不适应网络化运行的时代,通过设计采用电子实验报告的管理形式,既方便了管理工作又节省了资源.本文对电子实验报告管理系统的整体框架和功能实现进行阐述. 相似文献
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本文针对信息技术课教学中存在的学生电子作业及考试作品难于提交、采用网络共享或公用的Ftp帐号容易相互删除或拷贝作弊等问题,阐述了利用Ms Access+ASP设计,以Serv-U原版软件为基础的学生电子作业Ftp提交系统的解决方案。该系统运行稳定,效率较高,学生可自行修改作业管理密码,并实现了快速高效上传下载作业的功能。 相似文献
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《实验室研究与探索》2016,(6):116-118
设计了一种智能防盗防火报警系统,可全天候自动检测盗警和火警。该智能报警系统主要包含防盗防火模块及智能监控管理控制模块两大部分。前者是下位机,以STC89C52单片机为核心,采用热释电红外传感器实现防盗的功能;采用烟雾传感器实现防火的功能;采用红外传感器检测宿舍人员的进出情况,并用片内EEPROM做纪录;采用无线模块检测贵重物品的进出的功能。此外模块还能通过密码识别,当报警信息发出后只有输入正确的密码才能实现解警功能。后者是上位机,也以STC89C52单片机为核心,主要实现异地监控功能,与下位机采用RS485通信方式。下位机的报警求助信息及时传送到上位机,以便监控模块能采取相应的应急措施。整体系统功耗较小,兼容性好,稳定性高,成本低。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献