基于复杂网络的集装箱海运系统的鲁棒性研究

基于复杂网络理论,定义集装箱海运网络的稳定鲁棒性和性能鲁棒性,通过数值模拟,计算网络的度分布、簇系数、平均路径长度等指标,并研究集装箱海运网络在随机和蓄意两种攻击方式下的鲁棒性表现。研究结果表明,集装箱海运网络虽体现一些无标度特性,但仍以随机性为主;鲁棒性较好,且遵循一定的变化规律。本研究为集装箱海运系统能够稳定持续运行提供理论依据,也对提高网络的抗干扰能力、增强其鲁棒性提出研究思路。     

An identity-based encryption scheme with compact ciphertexts

This paper proposes an identity-based encryption scheme with the help of bilinear pairings, where the identity information of a user functions as the user's public key. The advantage of an identity-based public key system is that it can avoid public key certificates and certificate management. Our identity-based encryption scheme enjoys short ciphertexts and provable security against chosen-ciphertext attack (CCA).     

Distributed certificateless key encapsulation mechanism secure against the adaptive adversary

This paper proposes an adaptively secure solution to certificateless distributed key encapsulation mechanism from pairings by using Canetti's adaptive secure key generation scheme based on discrete logarithm. The proposed scheme can withstand adaptive attackers that can choose players for corruption at any time during the run of the protocol, and this kind of attack is powerful and realistic. In contrast, all previously presented threshold certificateless public key cryptosystems are proven secure against the more idealized static adversaries only. They choose and fix the subset of target players before running the protocol. We also prove security of this scheme in the random oracle model.     

大翼展混合驱动无人水下航行器水动力特性研究

为提高无人水下航行器的操纵性和运动控制算法的高效性,对航行器水的动力特性进行分析尤为重要。基于黏性流体理论,采用高效的计算域分区法提高航行器变攻角网格的生成效率,开展不同攻角和航速下的航行器水动力数值预报与分析,定量给出航行器的升阻力、升阻比和俯仰力矩系数随攻角的变化规律,得到航行器上浮和下潜时对应的最优攻角和动压力中心点偏移量,为航行器的运动的姿态控制提供设计和指导依据。分析攻角对航行器压力场、速度场和涡量场的影响规律,为后续优化航行器构型、提高航行器的水动力性能奠定基础。     

海军电子攻击机装备的现状及发展趋势

阐述电子攻击机在实战中的战术运用;对比世界强国电子攻击机与我军电子攻击机装备的现状,及我军电子攻击机存在的不足;展望未来电子攻击机面临的战场态势,分析我海军电子攻击机的发展趋势。     

模糊层次分析法在目标主攻方向评估中的应用

判断目标的主攻方向,是防空兵作战指挥中的重要环节。文章简要介绍了模糊层次分析法,并将其应用到空袭主攻方向的评估中,对影响主攻方向选择的诸多条件进行分析,为目标的主攻方向提供科学依据。     

联合作战复杂信息远程火力打击战法-应用

借助仿真、概率统计以及博弈分析的混合方法,通过对与复杂信息环境有关的不完全信息进行统计分析,构建了在复杂信息环境下全局最优的远程火力打击战法设计的理论模型,对该模型的初步研究表明：全局最优的远程火力打击战法比局部最优的远程火力打击战法更能满足复杂多变的战场需求,取得更好的战果。     

远程火力打击的信息欺骗定量分析方法-原理

文章针对定量分析信息欺骗对远程火力打击影响的难题,采用贝叶斯统计推测、博弈均衡分析和序分析方法得出了由基本概率矩阵元素构成的偏序关系决定是否存在信息欺骗机会的结论,不仅提供了解决此难题的可行方法,而且提供了科学运用远程火力打击战法的依据。     

Influence of Angle of Attack and Lateral Force between Wheel and Rail on Wear of Rail--a Laboratory Study

Angle of attack and lateral force are two important parameters influencing wheel-rail wear. This paper deals with the question of influences of the angle of attack and the lateral force on the wear of rail. A series of experiments are conducted on 1/4 JD-1 Wheel/Rail Tribology Simulation Facility. The angles of attack selected in the tests are 0°16′30″, 0°37′40″ and 1°0′0″ respectively. The lateral forces selected in the tests are 0.694 kN, 1.250 kN and 2.083 kN, respectively corresponding to the lateral forces of 25 kN, 45 kN and 75 kN measured in the field, with the aim of keeping the same ratio of L/V between laboratory and field conditions. It is found that the larger the angle of attack is, the more serious the wear of rail is. The relation of rail wear rate versus angle of attack is non-linear, and the relation of rail wear rate versus lateral force is approximately linear. The influence of angle of attack is more serious than that of lateral force. For the tractive wheelset, the wear index involving linear and quadratic function terms of angle of attack has good agreement with the limited experimental data. Some conclusions are given.     

盐渍土地区高性能混凝土耐久性研究

以内掺掺合料、中砂、细石、普通硅酸盐水泥以及抗硫水泥制成的细石高性能混凝土作为研究对象,在3种不同硫酸根浓度的浸泡液中进行100次干湿循环,用动弹性模量、抗折强度和抗压强度的变化研究硫酸盐侵蚀对混凝土耐久性的影响。结果表明,随着浸泡液中硫酸根浓度的逐步增加,混凝土受硫酸盐侵蚀程度逐步增加,试件的动弹性模量呈现逐步降低的趋势;在干湿交替环境下,混凝土试件的抗折强度指标比抗压强度指标更敏感,试件的抗折强度比抗压强度更能反应试件的受损程度。在干湿交替的水侵蚀和硫酸盐侵蚀环境中,掺加复合掺和料的高性能混凝土对硫酸盐侵蚀有较好的抵抗性能。