针对低成本无线射频识别(RFID)系统存在的安全性问题,提出一种基于PUF的低成本RFID安全协议。利用PUF的物理不可克隆性识别标签的身份,并利用线性反馈移位寄存器(LFSR)产生随机系列,加密阅读器与标签之间的通信,能抵抗重放攻击、跟踪攻...针对低成本无线射频识别(RFID)系统存在的安全性问题,提出一种基于PUF的低成本RFID安全协议。利用PUF的物理不可克隆性识别标签的身份,并利用线性反馈移位寄存器(LFSR)产生随机系列,加密阅读器与标签之间的通信,能抵抗重放攻击、跟踪攻击、物理攻击、窃听攻击等多种攻击。在Altera DE2板上使用FPGA实现PUF和LFSR,采用Quartus II 8.0编程。实验结果证明,该协议的执行时间和门电路数量能达到低成本标签的要求。展开更多
A framework of real time face tracking and recognition is presented, which integrates skin color based tracking and PCA/BPNN (principle component analysis/back propagation neural network) hybrid recognition techni...A framework of real time face tracking and recognition is presented, which integrates skin color based tracking and PCA/BPNN (principle component analysis/back propagation neural network) hybrid recognition techniques. The algorithm is able to track the human face against a complex background and also works well when temporary occlusion occurs. We also obtain a very high recognition rate by averaging a number of samples over a long image sequence. The proposed approach has been successfully tested by many experiments, and can operate at 20 frames/s on an 800 MHz PC.展开更多
Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises t...Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises the last ten chapters of the ＂Tale of Ganji,＂ is same as that of other chapters by using statistical analyses such as principal component analysis and random forests. The result of the analyses of word frequency shows that there is no obvious difference in word usage between the ten chapters and others. Thus, we conclude that it is highly possible that the chapters＇ author is same as that of others.展开更多
文摘针对低成本无线射频识别(RFID)系统存在的安全性问题,提出一种基于PUF的低成本RFID安全协议。利用PUF的物理不可克隆性识别标签的身份,并利用线性反馈移位寄存器(LFSR)产生随机系列,加密阅读器与标签之间的通信,能抵抗重放攻击、跟踪攻击、物理攻击、窃听攻击等多种攻击。在Altera DE2板上使用FPGA实现PUF和LFSR,采用Quartus II 8.0编程。实验结果证明,该协议的执行时间和门电路数量能达到低成本标签的要求。
文摘A framework of real time face tracking and recognition is presented, which integrates skin color based tracking and PCA/BPNN (principle component analysis/back propagation neural network) hybrid recognition techniques. The algorithm is able to track the human face against a complex background and also works well when temporary occlusion occurs. We also obtain a very high recognition rate by averaging a number of samples over a long image sequence. The proposed approach has been successfully tested by many experiments, and can operate at 20 frames/s on an 800 MHz PC.
文摘Singular authorship of＂The Tale of Genji,＂ which is the greatest accomplishment in classical Japanese literature, is doubtful In this study, we statistically analyze whether the author of Uji Jujo, which comprises the last ten chapters of the ＂Tale of Ganji,＂ is same as that of other chapters by using statistical analyses such as principal component analysis and random forests. The result of the analyses of word frequency shows that there is no obvious difference in word usage between the ten chapters and others. Thus, we conclude that it is highly possible that the chapters＇ author is same as that of others.
