水面舰艇末端防御与近程武器系统发展

 从水面舰艇末端防御体系层面角度探讨了舰船所面临的主要威胁与防御策略，分析了近程武器系统在末端防御体系中的作用、发展趋势及应用前景。     

多元累积和控制图

讨论了两种多元累积和图.第1种是利用 Hotelling 统计量进行累积和,形成多元累积和控制图,并讨论了它的平均游程长度(ARL);第2种是在已知偏移状态下,用序贯概率比检验法将多元累积和问题转化为一元累积和问题.这两种方法的前提都是随机变量服从正态分布.     

随机扰动下混合时滞混沌系统自适应同步

基于自适应同步原理,同时考虑系统内部参数不确定性和系统外部随机扰动,研究了一类具有混合时变时滞的混沌神经网络的同步问题.利用随机微分方程理论,lyapunov稳定性理论和线性矩阵不等式(LMI)的方法,设计自适应控制器.研究表明本方法能有效地克服干扰对同步所造成的破坏,实现良好的同步效果.最后,数据仿真证明了所给方法的有效性.     

QRS波群检测中的二次B样条小波变换算法

针对目前心电信号检测中准确度不高以及适应性不强的问题,提出了一种基于二次B样条小波,结合二分搜索算法和圆弧逼近曲线算法的QRS波群检测算法。首先对心电信号用二次B样条小波经Mallat算法分解,在二分搜索法调整阈值和模极大值检测R波的基础上,再用基于最小二乘圆弧逼近曲线算法检测T波与P波。最后用MIT-BIH数据库的数据验证了该改进算法增强了R波检测的适应能力,提高了T波与P波的检测准确度。仿真实验表明该改进算法可以有效地提高心电信号自动检测能力。     

Microwave transmission properties of metamaterials with double sets of square holes

The transmission property of microwave through a kind of metamaterial is investigated experimentally. Such metamaterials are fabricated with a structure of double sets of square holes: subwavelength ones, and small ones whose sizes and spacing are smaller at least one order of magnitude than those of the subwavelength holes. The experimental results show that the peak power of the measured transmission spectra is dependent on the structure parameters of the small holes. The physical origin to create this phenomenon is that the designer surface plasmons sustained by the small holes affect on the transmission property of the microwave passing through the subwavelength holes. The results are promising for proposing some techniques for optoelectronic devices in terahertz and microwave regime.     

ID-Based Public Auditing Protocol for Cloud Storage Data Integrity Checking with Strengthened Authentication and Security

Cloud storage service reduces the burden of data users by storing users’ data files in the cloud. But, the files might be modified in the cloud. So, data users hope to check data files integrity periodically. In a public auditing protocol, there is a trusted auditor who has certain ability to help users to check the integrity of data files. With the advantages of no public key management and verification, researchers focus on public auditing protocol in ID-based cryptography recently. However, some existing protocols are vulnerable to forgery attack. In this paper, based on ID-based signature technology, by strengthening information authentication and the computing power of the auditor, we propose an ID-based public auditing protocol for cloud data integrity checking. We also prove that the proposed protocol is secure in the random oracle model under the assumption that the Diffie-Hellman problem is hard. Furthermore, we compare the proposed protocol with other two ID-based auditing protocols in security features, communication efficiency and computation cost. The comparisons show that the proposed protocol satisfies more security features with lower computation cost.     

从《男人还剩下什么》看毕飞宇小说的男性立场

在被称为"写女性心理最好的男作家"的毕飞宇的小说创作中,也有一群平庸无为的男性形象。短篇小说《男人还剩下什么》是他关注男性生存状态的特写,是他创作中的沧海遗珠,以独特的价值展示着他对于男性生存现状的探究。一方面,他通过对男性形象感情世界的挖掘,展现出当下男性感情世界"失语"的状态:爱的能力与人性纯真的丧失,雄性力量的失落;另一方面,他以第一人称的叙事方式和反讽调侃式的个性标识语言,表现男性主体精神。同时,他又在一定上超越了男性立场,让读者感受到男作家的特质以及普世的人文关怀。     

高保真电视胸腔镜肺叶切除术模拟

电视胸腔镜(VATS, Video-assisted thoracoscopic surgery)肺叶切除术仿真系统对外科医生手术培训及规划具有重要价值。为实现高保真电视胸腔镜肺叶切除术的模拟,设计了一套有效模拟VATS手术过程中不同手术操作的肺叶切除术模拟器。采用基于位置的动力学仿真框架实现了手术器械-软组织和软组织间交互作用、软组织切割以及手术缝合操作引起的变形模拟;并采用了Marching Cubes算法对模型进行面绘制,尤其是切割操作的渲染;使用GPU并行计算的方法加速手术模拟和面绘制。实验结果表明,本文方法可实现高保真、稳定、高效的VATS手术仿真效果。     

PVA-ECC的最优配比及力学性能试验研究

考虑影响纤维增强水泥基复合材料（ECC）力学性能的关键因素,从抗压强度入手,基于水胶比、粉煤灰掺量、减水剂掺量等的变化,制作各批次的ECC立方体试件并进行抗压强度试验,探索ECC的力学性能随材料配比而变化的规律.研究结果表明,在其它因素都相同的条件下,PVA-ECC的立方体抗压强度随水胶比的增大而减小、随粉煤灰掺量的增加而减小、随减水剂掺量的增加先增大后减小.在普遍意义上,当水胶比为0.25、粉煤灰掺量为45％、减水剂掺量为0.5％时,PVA-ECC达到最优配比,此时立方体抗压强度达到最大.     

Monitoring and analysis of shock wave in water for underwater drilling blasting

Taking the underwater reef blasting in Gulei sea channel of Xiamen Port as an example, the forming characteristic of shock wave in water for underwater drilling blasting is analyzed. By field monitoring, the pres- sure of shock wave in water for different distances is attained; the major parameters such as pressure amplitude and positive action time, and the propagation attenuation rule of shock wave in water are analyzed in this paper. The results can be helpful for engineering design and construction and environmental safety assessment.