鲁迅与魏晋南北朝诗歌

鲁迅以魏晋诗人的人格理想对诗性精神的影响为思考脉络,来考察这一时期的文化风貌之于诗歌的意义,并用“魏晋风度”来概括。在精神文化传承上,鲁迅和魏晋诗人都对酒情有独钟,借助于酒文化获得精神上的超越。在艺术创作上,鲁迅诗歌与魏晋南北朝诗歌都有着沉郁、苍劲的特点,也都呈现出率真自然的风格。     

基于FAHP的DDoS攻击效果评估

分析了传统层次分析法（AHP）存在的问题,提出了运用模糊层次分析法（FAHP）进行DDoS攻击效果评估。运用AHP法建立了DDoS攻击效果评估的指标体系,通过构造模糊一致判断矩阵,求出各项评估指标的权重。最后运用综合评价法进行综合评估,并得出DDoS攻击效果评估结果。     

一维光子晶体反射镜的光学能带结构

运用传递矩阵方法计算了作为反射镜的碲化铅/冰晶石一维光子晶体的光学能带结构,并研究了其禁带和相对带隙宽度随晶格周期和碲化铅的填充因子的变化。     

线性方程组迭代解法的另类矩阵形式

改进了线性方程组迭代解法的矩阵形式．以最简单的Jacobi迭代法的迭代矩阵为基础,只需经过简单的加减和数乘运算就可得到Seidel和SOR的迭代过程,使得算法新形式的求解过程数学意义非常明确,表达形式也非常简洁,这样不仅便于理解记忆,还非常有利于编程实现。改进后的矩阵迭代形式求解计算量为:Seidel需要大约n2次乘除法．SOR约为2n2次乘除法,且改进后的Seidel迭代法和SOR方法存储空间也较传统形式为少。     

矩阵多项式aA+bI

本文讨论了矩阵A满足f(A)=0时一次矩阵多项式aB+bI可逆的条件,并给出了来(aA+bI)-1的一般方法。     

基于最优分离矩阵循环迭代的盲源分离次序调整算法

文章针对盲源分离中输出信号帧与帧之间信号衔接顺序的不确定性问题,提出了最优分离矩阵循环迭代算法,将每帧信号分离时目标函数寻优所得分离矩阵作为下一帧循环的初始化矩阵进行迭代来分离信号。理论分析与计算机仿真表明:该算法能有效解决盲分离中信号次序的不确定性问题,具有较强的实际应用价值。     

A novel launch dynamics measurement system for multiple launch rocket system and comparative analysis with numerical simulations

In this paper,a novel launch dynamics measurement system based on the photoelectric sensor pair is built.The actual muzzle time(i.e.a time duration that originates from the initial movement to the rocket's departure from the muzzle)and the muzzle velocity are measured.Compared with the classical methods,the actual muzzle time is obtained by eliminating the ignition delay.The comparative analysis method is proposed with numerical simulations established by the transfer matrix method for multibody systems.The experiment results indicate that the proposed measurement system can effectively measure the actual muzzle time and reduce the error of classical methods,which match well with the simulation results showing the launch dynamics model is reliable and helpful for further analysis and design of the MLRS.     

Supercritical carbon dioxide as a new working medium for pneumatic launch: A theoretical study

Compared with the conventionally gaseous or liquid working media, the specific internal energy of supercritical carbon dioxide (SCD) is higher at the same temperature and pressure, and the critical temperature of carbon dioxide is close to room temperature, making SCD a potential new working medium for pneumatic launch. To analyze the feasibility of this conception, an analytical model of a pneumatic catapult is established on basis of the conservations of mass and energy. The model consists of a high-pressure chamber and a low-pressure chamber connected by multiple valves, and there is a movable piston in the low-pressure chamber that can push an aircraft to accelerate. The effects of the launch readiness state of SCD in the high-pressure chamber, the initial volume of the low-pressure chamber and the valve control on the movement of the aircraft are analyzed. It is found that there is a restrictive relation between the temperature and pressure of the launch readiness state of SCD, i.e., there is a maximum allowable launch readiness pressure when the launch readiness temperature is fixed. If this restrictive relation is not satisfied, the working medium in the low-pressure chamber will drop to its triple point within a few milliseconds, leading to a launch failure. Owing to this restrictive relation, there is an optimal launch readiness state of SCD with the highest working capacity for any allowable launch readiness temperature. The pressure of the low-pressure chamber will decrease significantly as the initial volume increases, leading to a decreased acceleration of the aircraft. The ac-celeration can be controlled below a critical value by a designed sequential blasting technique of multiple valves. The calculated results show that a 500 kg aircraft can be accelerated from 0 to 58 m/s in 0.9 s with 36 kg of carbon dioxide. This research provides a new technique for the controllable cold launch of an aircraft.     

一种判别离散型随机变量相互独立的新方法

对两个离散型随机变量相互独立的问题,通过引入分布律矩阵的概念,借助矩阵理论中行向量的相关结论,提出一种新的判别独立的方法。与以往的方法相比,这种方法更为简单和实用,更重要的是具体操作过程中计算量大为减少。     

杂合数据的粗糙集属性约简方法

针对决策表中属性取值为杂合数据的情况,提出了基于粗糙集理论的属性约简算法.首先给出了对象间在杂合数据下的相似度计算定义.为了获取合理的对象集合的软划分,给出了阈值计算的最优化模型,并基于粗糙集的上、下近似的概念,得到对象集合在条件属性下的上、下近似的覆盖划分.之后,通过各对象基于条件属性和决策属性的上、下近似下的分布矩阵描述,利用最大分布矩阵,直观地得到两种不同观点下的约简结果.实验结果表明了本算法的合理和有效性.