摘要：根据目前水产品监管溯源系统中水产品企业身份认证存在的问题,设计了一种基于USB key的水产品企业监管溯源系统。首先,分析了几种身份认证技术的方法,重点阐述了其优缺点;然后,设计了USB key硬件电路关键部分、软件系统以及基于USB key认证的水产品企业的认证流程,解决了水产品信息传输的安全性问题;最后,描述了基于USB key的水产品企业监管模式在江苏省水产品企业认证与监管追溯平台中的应用。研究结果表明,该监管溯源系统便捷安全,稳定可靠,能实现产地准出、市场准入、企业资质认证、政府实时监控的水产品企业监管溯源体系。

摘要：Biological knowledge is becoming an important source of inspiration for developing creative solutions to engineering design problems and even has a huge potential in formulating ideas that can help firms compete successfully in a dynamic *** identify the technologies and methods that can facilitate the development ofbiologically inspired creative designs,this research briefly reviews the existing biological-knowledge-based theories and methods and examines the application of biological-knowledge-inspired designs in various ***,this research thoroughly examines the four dimensions of key technologies that underlie the biologically inspired design(BID)*** research then discusses the future development trends of the BID process before presenting the conclusions.

摘要：In this paper, based on analyses of the Chinese Area Positioning System (CAPS) satellite (GEO satellite) resources and signal properties, the signal power at the port of the receiver antenna is estimated, and the implementation projects are presented for a switching band C to band L CAPS C/A code receiver integrated with GPS receiver suite and for a CAPS dual frequency P code receiver. A microstrip receiving antenna is designed with high sensitivity and wide beam orientation, the RF front end of the C/A code and P code receivers, and a processor is designed for the navigation baseband. A single frequency CAPS C/A code receiver and a CAPS dual frequency P code receiver are built at the same time. A software process flow is provided, and research on relatively key techniques is also conducted, such as signal searching, code loop and carrier loop algorithms, a height assistant algorithm, a dual frequency difference speed measurement technique, a speed measurement technique using a single frequency source with frequency assistance, and a CAPS time correcting algorithm, according to the design frame of the receiver hardware. Research results show that the static plane positioning accuracy of the CAPS C/A code receiver is 20.5-24.6 m, height accuracy is 1.2-12.8 m, speed measurement accuracy is 0.13-0.3 m/s, dynamic plane positioning accuracy is 24.4 m, height accuracy is 3.0 m, and speed measurement accuracy is 0.24 m/s. In the case of C/A code, the timing accuracy is 200 ns, and it is also shown that the positioning accuracy of the CAPS precise code receiver (1σ ) is 5 m from south to north, and 0.8 m from east to west. Finally, research on positioning accuracy is also conducted.

摘要：传统SQL数据库在管理大数据、性能和扩展性等方面的不足使得其不能胜任如大规模数据挖掘、商务智能及社交网络等应用场景,而NoSQL数据库由于其在上述应用领域优良的特性近年来得到很快发展。本文在分析现有开源NoSQL数据库产品Kyoto Cabinet和Tair的不足基础上,设计并实现了一个高性能的key/Value数据库XDB。XDB分段流水并发处理key/Value请求,并采用一致性算法保证在并发环境中对key/Value记录读写的相关性,在随机写入和顺序写入实验中,相比于Kyoto Cabinet,XDB的性能分别提高6倍和15倍。

摘要：针对使用USB key硬件进行身份认证和数据签名时,存在PIN码明文传输被窃听及待签名数据有可能会被其他恶意程序篡改等安全威胁,提出了一种基于保护进程的USB key软件安全架构,从USB key驱动文件的完整性、防止USB key进程被动态DLL注入和进程内存数据的非法修改等方面,确保USB key进程的真实性和可信性,可以有效地防止PIN码的截获和USB key进程内存数据被恶意程序修改,进而提高USB key在使用过程中的安全性。

摘要：提出一种USB无线上网卡和USB key二合一的产品设计,详细介绍了系统的硬件结构和软件流程。设计中将USB key功能模块合理地划分在基带处理器和专用安全芯片两个部分中,利用USB Bulk_Only传输协议完成主机与USB设备上虚拟CD-ROM设备的命令应答和数据交换。该产品有效地降低了产品硬件成本,提高了用户使用便捷性。

摘要：随着网络技术的快速发展,普通的口令认证方式已不能满足用户的安全需求。本文通过对USB key的工作原理及身份认证技术进行分析探讨,设计并实现了基于USB key的身份认证登录系统,极大地提升了应用系统的安全性。

摘要：提出了一种高安全、高效率、低成本USB接口密钥的设计方法。采用8位USB微控制器MC9S08JS16,通过其内置的全速USB2.0模块,实现与PC机的通信,并采用现在公认最安全和高效的高级加密标准(AES)算法对输入数据进行加密,同时对AES在单片机中的加密程序进行了优化。实验表明,USB密钥可在短时间内完成对少量数据的加密,适用于加密数据量较小的场合,电路设计简单,稳定性高,易于携带。

摘要：In the process of piano teaching,it is the basic working ability of piano teachers to independently study and process works and guide *** the face of a strange work,the piano teacher should first conduct a comprehensive analysis and research of the work,and then can reasonably guide the *** from three aspects of work research,performance design,and key points of attention,this paper expounds the ways and steps of work research and processing in order to help the piano teachers to expand their teaching repertoire.

摘要：本文首先介绍了现在网银在身份认证这一环节采用的主要方法,即基于USB key的网银客户端身份认证方式,并对其安全性作了相关分析。为了提高网银交易的安全性,本文提出了基于指纹识别技术USB key的身份认证方法,并给出了相关的设计方案,这种方案比输入PIN码的USB key的安全性要高得多,具有很好的市场发展前景。