基于位承诺的数字证书敏感信息保护

目前数字证书缺少敏感信息保护机制,容易泄露用户的隐私信息.针对数字证书的敏感信息泄露问题,采用基于单向函数的位承诺协议实现数字证书中敏感信息的隐藏和选择性披露,详细讨论了基于位承诺的证书申请、证书颁发及证书查询验证过程,并分析了位承诺协议的安全性和效率.     

Research on wind turbine blade damage based on pre-stressed FBG strain sensors

One of the essential parts of a wind power generator that captures wind energy is the wind turbine blade. The safety of the blades rapidly declines as a wind turbine''s operating period grows. For real-time monitoring, a chip-type pre-stressed fiber Bragg grating (FBG) strain sensor was fabricated. The sensor''s structure was improved using simulation analysis along with optimization. It was discovered through calibration trials that the pre-stressing method expanded the sensor''s range of measurement, guaranteed overall linearity, and prevented the potential hysteresis phenomena during compression. The sensor''s final sensitivity was calculated to be 1.970 pm/με, and its linear fitting coefficient was 0.999. Finally, the sensor was used to monitor the wind turbine blades and the strain change curve of the root of a normally functioning blade is found to be a sine curve, which provides a certain reference value for judging whether the blade is damaged in the future.     

基于混沌序列的RFID安全加密机制

针对现有RFID系统读写器和标签之间通信安全性低、易受到各种攻击的安全问题,介绍基于Logistic混沌序列的动态实时密钥方法,提出一种基于混沌序列RFID的安全加密机制,采用动态实时密钥对RFID系统中的读写器与电子标签通信消息进行加密。仿真实验结果表明,该方法能够解决RFID系统中非法存取、伪造哄骗、数据泄露、位置跟踪等安全问题。     

一种可视二维条码设计

融合信息隐藏与二维条码编译码技术,提出一种基于图像的可视二维条码设计。对图像进行块误差扩散,得到的半色调图像作为码图,将编码块嵌入置乱后的码图,反置乱使编码块分散在码图中。与以往提出的图像条码相比,该设计注重图像的可视性,可以表达图像信息。实验结果表明,该设计效果较好。     

DNA片段拼接中的预归并重复序列屏蔽方法

针对DNA片段拼接中的重复序列识别及屏蔽问题,提出一种预归并重复序列屏蔽方法。在片段拼接前通过扫描子串标识出可能存在重叠关系的shotgun片段,利用子串归并该相关片段,标识出重复序列的位置信息,达到屏蔽的目的。计算机模拟分析表明,该方法识别重复序列的错误率低,通过预归并有效缩减了shotgun集合的规模,降低了拼接时的计算复杂度。     

一种检查层次式有穷状态机一致性的方法

本文介绍了一种层次式有穷状态机（HFSM）的代数表示,并在此基础之上提出了HFSM的一致性检查方法。这种检查方法主要用于检测HFSM中的不确定性状态转换和不可达状态。     

谈高校艺术设计专业的色彩教学改革

如何探索一套适用于艺术设计专业特点的基础教学方法,利用有限的时间,通过有效的训练,为专业设计建立联系,打下基础,一直是艺术设计教育者应该思考和探索的问题。     

基于ASP的应用:对EXCEL数据进行分析

针对用Excel表格作统计分析报表时出现的弊端,本文利用ASP和数据库技术对Excel原始数据进行导入、分析,从而得到满足需求的报表。     

彗星试验在农药安全评价中的应用

彗星试验(Comet assay)，又称单细胞凝胶电泳试验(SCGE)，是一种快速、简便、灵敏的检测单个细胞DNA断裂的新技术，由于其具备其它试验无可比拟的优越性，因此应用前景十分广泛。本文就该技术的原理、操作程序和方法作一介绍，并预测其在农药安全评价中将有广阔的应用前景。     

Polycrystalline diamond MESFETs by Au-mask technology for RF applications

Metal-semiconductor field effect transistors (MESFETs) were fabricated on H-terminated polycrystalline diamond.The DC characteristics of the p-channel MESFET showed a maximum drain current density of 204 mA/mm at a gate-source voltage of 6 V,and a maximum transconductance of 20 mS/mm at a gate-source voltage of 1.5 V.The small signal S-parameters of MESFET with 2 100 m gate width and 2 m gate length were measured.An extrinsic cut-off frequency (fT) of 1.7 GHz and the maximum oscillation frequency (fmax) of 2.5 GHz were obtained,which was the first report on diamond MESFETs with RF characteristics in China.