以数据为中心的C~4ISR系统体系结构开发方法

体系结构开发方法研究是当前C4ISR系统体系结构技术研究的一个热点,在总结现有相关问题的基础上,提出了以数据为中心的C4ISR系统体系结构开发方法的定义,并提出了该方法的开发过程.将体系结构开发分为初始化、数据分析、数据设计和数据验证四个阶段,并详细说明了各个阶段主要完成的任务及其常用的方法.最后对以数据为中心的体系结构开发方法的发展进行了总结和展望.     

Stability in a general oligopoly model

We analyze a general but parsimonious price competition model for an oligopoly in which each firm offers any number of products. The demand volumes are general piecewise affine functions of the full price vector, generated as the “regular” extension of a base set of affine functions. The model specifies a product assortment, along with their prices and demand volumes, in contrast to most commonly used demand models. We identify a fully best response operator which is monotonically increasing so that the market converges to a Nash equilibrium, when firms dynamically adjust their prices, as best responses to their competitors' prices, at least when starting in one of two price regions. Moreover, geometrically fast convergence to a common equilibrium can be guaranteed for an arbitrary starting point, under an additional condition for the price sensitivity matrix.     

Planning gamma accelerated degradation tests with two accelerating variables

Gamma accelerated degradation tests (ADT) are widely used to assess timely lifetime information of highly reliable products with degradation paths that follow a gamma process. In the existing literature, there is interest in addressing the problem of deciding how to conduct an efficient, ADT that includes determinations of higher stress‐testing levels and their corresponding sample‐size allocations. The existing results mainly focused on the case of a single accelerating variable. However, this may not be practical when the quality characteristics of the product have slow degradation rates. To overcome this difficulty, we propose an analytical approach to address this decision‐making problem using the case of two accelerating variables. Specifically, based on the criterion of minimizing the asymptotic variance of the estimated q quantile of lifetime distribution of the product, we analytically show that the optimal stress levels and sample‐size allocations can be simultaneously obtained via a general equivalence theorem. In addition, we use a practical example to illustrate the proposed procedure.     

Maintaining systems with heterogeneous spare parts

We consider the problem of optimally maintaining a stochastically degrading, single‐unit system using heterogeneous spares of varying quality. The system's failures are unannounced; therefore, it is inspected periodically to determine its status (functioning or failed). The system continues in operation until it is either preventively or correctively maintained. The available maintenance options include perfect repair, which restores the system to an as‐good‐as‐new condition, and replacement with a randomly selected unit from the supply of heterogeneous spares. The objective is to minimize the total expected discounted maintenance costs over an infinite time horizon. We formulate the problem using a mixed observability Markov decision process (MOMDP) model in which the system's age is observable but its quality must be inferred. We show, under suitable conditions, the monotonicity of the optimal value function in the belief about the system quality and establish conditions under which finite preventive maintenance thresholds exist. A detailed computational study reveals that the optimal policy encourages exploration when the system's quality is uncertain; the policy is more exploitive when the quality is highly certain. The study also demonstrates that substantial cost savings are achieved by utilizing our MOMDP‐based method as compared to more naïve methods of accounting for heterogeneous spares.     

On efficiency of multistage channel with bargaining over wholesale prices

This article considers a multistage channel with deterministic price‐sensitive demand. Two systems for pricing decisions, that is, the bargaining system and the leader‐follower system, are compared. We characterize the necessary and sufficient conditions on the power structure, under which the solution of the bargaining system Pareto dominates that of the leader‐follower system. Also, under such conditions, we give a tight upper bound of channel efficiency of the bargaining system, which converges to 100% channel efficiency as the number of stages increases to infinity. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 449–459, 2016     

A nested benders decomposition approach for telecommunication network planning

Despite its ability to result in more effective network plans, the telecommunication network planning problem with signal‐to‐interference ratio constraints gained less attention than the power‐based one because of its complexity. In this article, we provide an exact solution method for this class of problems that combines combinatorial Benders decomposition, classical Benders decomposition, and valid cuts in a nested way. Combinatorial Benders decomposition is first applied, leading to a binary master problem and a mixed integer subproblem. The subproblem is then decomposed using classical Benders decomposition. The algorithm is enhanced using valid cuts that are generated at the classical Benders subproblem and are added to the combinatorial Benders master problem. The valid cuts proved efficient in reducing the number of times the combinatorial Benders master problem is solved and in reducing the overall computational time. More than 120 instances of the W‐CDMA network planning problem ranging from 20 demand points and 10 base stations to 140 demand points and 30 base stations are solved to optimality. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

仿形轻诱饵空间定姿初探

注意到目前反导武器逐渐使用图像区分真假目标的发展状况,阐述了对于远程BM使用仿形轻诱饵进行突防是一个很好的方法。探讨了研制仿形轻诱饵可能涉及的几项关键技术,借鉴卫星姿态稳控技术,初步探讨了南北飞行的轻诱饵使用磁强计和磁力矩器利用地磁场定姿的可行性,并分析了其局限性。最后说明了这种方法对于南北飞行的诱饵,在BM弹头可调姿的情况下,是可以与弹头姿态保持一致的。     

基于MAS的战时装备机动保障模型研究

建立了一个基于多agent系统的战时装备机动保障模型,定义了划分层次和各agent模块的功能,并重点介绍了机动保障过程中机动过程和抢修作业过程模型的构建,为战时装备机动保障指挥提供辅助决策。     

反潜战仿真系统目标仿真建模与设计

反潜战仿真系统是反潜武器装备研制、反潜作战能力评估、反潜战术战法研究的有效手段,因此能否提供高逼真度的目标潜艇仿真将直接影响到反潜作战仿真系统的整体性能。从未来潜艇作战环境出发,分析了潜艇仿真的功能组成,建立了仿真模型体系,提出了基于模型库的潜艇仿真设计方案和实现方法,为反潜战仿真系统的建立提供了有力的支撑。     

一种新型的随动系统变结构模糊位置控制器

将变结构自适应PID控制及模糊控制两种控制技术相结合,设计了一种新型的变结构自适应模糊PID位置控制器。采用变结构自适应PID控制器进行误差控制,对前馈参数采用模糊控制方法进行在线整定,实现了前馈补偿与误差控制的精确匹配,进一步抑制系统抖动现象,提高系统跟踪精度。试验结果表明,将变结构自适应模糊PID位置控制器应用于数字交流随动系统的位置控制中,既能保证系统的稳定性和快速性,又具有很好的跟踪精度,较好地解决了随动系统跟踪精度、稳定性、快速性要求高,参数难以相互协调匹配的问题,大大改善系统闭环响应的品质,提高了系统的控制性能。