一种基于安全控制的异地灾备系统设计与实现

设计并实现了一种将实时镜像存储、系统恢复和系统监控集于一体的异地容灾系统.该系统将本地截获的写操作缓存在本地控制中心上,然后发送到远程进行重放完成异地备份.该系统通过访问控制机制解决了在传统灾难备份系统中访问控制薄弱的问题;通过差错控制保证了镜像数据的可靠性;通过密钥管理机制保证了灾备系统自身的安全.     

基于Lattice的验证方环签名改进算法研究

为了解决现有的数字签名机制在发放软件著作、专利许可证以及项目工程招投标等应用中出现的各种隐私安全问题,以随机预言模型下的相关签名方案为理论基础,提出了一种基于格结构（Lattice）的强约束验证方环签名改进算法,即L_SRS算法。该算法在标准模型下给出了详实的安全性分析,依据标准的小整数解困难问题,L_SRS算法增加了一种强约束安全机制,能够有效抵抗适应性选择消息攻击,对其具有强不可伪造性。通过安全性与性能分析,L_SRS算法具有应用高安全性、签名计算高效率性等特点。     

网络对抗训练混合虚拟化平台设计研究

讨论了虚拟化技术实现原理及其在网络对抗教学中的应用上,分析了各类虚拟化技术的优缺点和构建网络对抗训练环境存在的问题。提出了一种混合虚拟化平台设计,该平台利用Libvirt虚拟化的应用程序编程接口（API）调用两种虚拟化技术同时运行在同一物理主机上。并详细叙述了混合虚拟化平台的实现过程和方法,并在多个虚拟机内同时运行测试基准,分析其可扩展性。多种虚拟化技术在同一物理机上的混合,实现了复杂实验环境的创建,对构建大规模的网络实验平台具有一定的参考价值。     

COMPARATIVE STUDY OF FUZZY CONTROL,PID CONTROL,AND ADVANCED FUZZY CONTROL FOR SIMULATING A NUCLEAR REACTOR OPERATION

Based on the background of fuzzy control applications to the first nuclear reactor in Belgium (BR1) at the Belgian Nuclear Research Centre (SCK˙CEN), we have made a real fuzzy logic control demo model. The demo model is suitable for us to test and compare some new algorithms of fuzzy control and intelligent systems, which is advantageous because it is always difficult and time-consuming, due to safety aspects, to do all experiments in a real nuclear environment. In this paper, we first report briefly on the construction of the demo model, and then introduce the results of a fuzzy control, a proportional-integral-derivative (PID) control and an advanced fuzzy control, in which the advanced fuzzy control is a fuzzy control with an adaptive function that can self-regulate the fuzzy control rules. Afterwards, we present a comparative study of those three methods. The results have shown that fuzzy control has more advantages in terms of flexibility, robustness, and easily updated facilities with respect to the PID control of the demo model, but that PID control has much higher regulation resolution due to its integration term. The adaptive fuzzy control can dynamically adjust the rule base, therefore it is more robust and suitable to those very uncertain occasions.     

基于轮廓线局部描述符的三维人脸识别

提出了一种基于等测地轮廓线的局部描述符来识别三维人脸。首先对三维人脸数据进行预处理, 得到统一的人脸区域并进行姿态归一化; 然后根据测地距离提取到鼻尖点相同距离的点组成等测地轮廓线, 对轮廓线进行重采样, 并对轮廓线上每个采样点的邻域提取局部描述符; 最后在建立测试人脸和库集人脸的点对应关系后进行局部描述符的加权融合和比较, 给出最终识别结果。算法在FRGC(face recognition grand challenge)v2. 0数据库上进行测试, 实验结果表明该方法具有较好的识别性能。     

短波地空通信站址布局评估方法

针对短波地空通信站址布局的评估问题,给出2个评估站址布局方案的指标——覆盖度和覆盖效率,分别运用网格扫描法和蒙特卡罗方法对这2个指标进行确定。通过仿真,对正方形和正六边形2种特殊站址布局结构进行评估和比较,得出正六边形结构更合理的结论,并验证了这2个评估指标和确定方法的可行性和有效性。     

ALC-OFDM系统中的ACMS新选择准则

针对新一代宽带卫星通信,建立了自适应低密度奇偶校验码(LDPC)编译码的正交频分复用(ALC-OFDM)传输系统结构与信道模型.在分析固定编码调制方式基础上,提出了一种加权信噪比(SNR)的自适应编码调制方案(ACMS)选择新准则,使每种编码调制方案对应着一个信道平均信噪比范围,可以有效找出使系统吞吐量最优的信噪比切换门限值.仿真结果表明:在系统的误比特率(BER)满足要求的情况下,对比各种加权准则,加权得到的SNR越大,采用该准则的系统吞吐量越大;当系统吞吐量都达到最大值时,采用3种加权方式的信噪比切换门限比传统准则至少降低了2 dB.     

一种新型混沌扩频卫星隐蔽通信算法

针对Logistic及改进型混沌映射只存在唯一满映射点的缺陷,设计了一种新型混沌映射函数,拓宽了满映射参数的取值范围,进而提高了混沌序列遍历性,并基于相干混沌移位键控技术,构建了新型混沌扩频卫星隐蔽通信系统。分别对新型混沌序列的随机性、相关性和平衡性,以及隐蔽通信系统的误码率进行了仿真分析,结果表明:新型混沌映射比已有映射遍历性更好,平衡性更高。原业务信号与扩频调制信号的功率比值大于20dB时,原业务接收机接收误码率基本不受影响。扩频因子为80、信道信噪比大于6dB时,隐蔽接收机误码率小于10-3,能满足一定的隐蔽通信要求。     

基于PatchMatch的半全局高效双目立体匹配算法

近年来双目立体匹配技术发展迅速,高精度、高分辨率、大视差的应用需求无疑对该技术的计算效率提出了更高的要求.由于传统立体匹配算法固有的计算复杂度正比于视差范围,已经难以满足高分辨率、大视差的应用场景.因此,从计算复杂度、匹配精度、匹配原理等多方面综合考虑,提出了一种基于PatchMatch的半全局双目立体匹配算法,在路径...     

A novel surgical method of repair for Stahl's ear: a case report and review of current treatment modalities

Stahl's ear is a congenital malformation of the auricle, which is uncommon in non-Oriental societies. A number of different treatment modalities have been suggested, many of which yield unpredictable results. We review current treatment modalities from the English literature and describe a novel, simple surgical method of repair. First, a helical rim incision is made to expose the abnormal third crus and upper pole of the ear. The third crus is excised as a narrow wedge of cartilage and posterior skin, and the defect is closed primarily. The free third crus cartilage is then grafted onto the scaphal cartilage in an anatomically correct position to form a superior crus. The anterior skin flap is redraped and bolstered over this graft. Only a very small scar on the helical rim remains visible anteriorly.