Some comparison results of system availability

System availability is a measure which is used to evaluate the performance of a system which can be in one of the two states: operational or nonoperational. It indicates the proportion of the time the system is available to perform its function. This paper discusses the concepts of stable point availability, stable interval availability, and long-run availability for the case of complete/minimal repair. Comparisons of these measures are made based on stochastic orderings and classifications of lifetime distributions. These comparisons are useful in determining policies for improving or maximizing the proportion of time the system is operational. The effect of using a burn-in procedure for maximizing these measures is also discussed. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 205–218, 1998     

联合空时抗干扰天线阵的快速实现方法

联合空时抗干扰方法,性能优于单纯的空域或单纯的时域抗干扰,但是由于其计算复杂度大,实际应用受到一定限制.针对这一矛盾,在MSNWF基础上,通过分析抗干扰天线阵观测信号协方差矩阵的Toeplitz特性,构造高维Toeplitz矩阵,利用FFT技术,提出一种联合空时抗干扰天线阵的快速实现方法.计算量的比较结果表明该方法可以大大降低STAP的计算量,使得联合空时抗干扰技术的实际应用变得更容易.     

基于Chirp变换的快速离散时间尺度变换

提出了一种新的快速离散时间尺度变换算法。给出了离散时间信号尺度变换的构造表达式及其Chirp变换快速实现流程。讨论了Chirp变换实现中的参数选取准则,分析了Chirp变换的信号带宽问题。讨论了算法的运算效率并与其它算法进行了比较。仿真试验证明了本文算法的有效性。     

建立健全科学的军队干部考核评价体系

建立健全军队干部考核评价体系,必须以科学发展观和正确的政治观为指导,建立与完善军队干部考核评价主体体系、内容体系、方法体系以及相关制度措施。     

军队编制体制调整对人员整体结构的影响

建立了军队人员等级结构模型,通过"等待时间"和"理想态"的定义,给出了从任意等级状态达到"理想态"的最优方法。在给定理想态下,为平衡等级结构内部流动性和平稳性,提出了求取各等级转移概率(转移矩阵)的方法。利用该模型,以"等待时间"和调入量为指标,对军队体制编制调整中出现的结构不平衡的现象进行分析,提出了对策建议。     

Dynamic pricing and matching in ride-hailing platforms

Ride-hailing platforms such as Uber, Lyft, and DiDi have achieved explosive growth and reshaped urban transportation. The theory and technologies behind these platforms have become one of the most active research topics in the fields of economics, operations research, computer science, and transportation engineering. In particular, advanced matching and dynamic pricing (DP) algorithms—the two key levers in ride-hailing—have received tremendous attention from the research community and are continuously being designed and implemented at industrial scales by ride-hailing platforms. We provide a review of matching and DP techniques in ride-hailing, and show that they are critical for providing an experience with low waiting time for both riders and drivers. Then we link the two levers together by studying a pool-matching mechanism called dynamic waiting (DW) that varies rider waiting and walking before dispatch, which is inspired by a recent carpooling product Express Pool from Uber. We show using data from Uber that by jointly optimizing DP and DW, price variability can be mitigated, while increasing capacity utilization, trip throughput, and welfare. We also highlight several key practical challenges and directions of future research from a practitioner's perspective.     

从联合条令看美国军事法的发展和创新

联合条令不仅在美军向联合军队转型的过程中起到了非常重要的指引和保障作用,而且在内容和形式上也体现出美国军事法规的发展方向和创新思路.     

以科学发展观为指导推进军校科研工作创新发展

以科学发展观为指导推进军校科研工作创新发展,必须着眼于建设一流名校,创造条件充分实现教员干部学员的学术发展,着力解决好发展方式问题,积极适应全军院校教学工作评价对科研评价点的导向要求。     

基于VDCNN和LSTM混合模型的入侵检测算法

为了提高入侵检测系统在复杂数据集下的分类性能,提出一种将超深度卷积网络(very deep convolu-tional neural networks,VDCNN)和长短时记忆网络(long short-term memory,LSTM)混合模型的入侵检测算法.本模型通过CICFlowMeter工具对CES-CIC-...     

高阶拟线性椭圆型方程的非平凡解

设ΩR~n是有界区域。本文讨论高阶拟线性椭圆型方程的非平凡解。 sum from|α|≤m (-1)~(|α|)D~a(F_a(x,u,…,D~mu))=0,x∈Ω(1) 其中α=(α_1,α_2,…,α_n),F_α=F_D~a_u=D~αu=D~ou=u,|α|=0。当F_α满足条件(F_1)-(F_4)时,证明了在Sobolev空间W_0~m,p(Ω)内存在非平凡解。