基于扩展HTN规划的作战任务分析方法

任务分析是一个认识和了解任务本质的过程,作为作战计划拟制过程中的一个核心环节,作战任务分析的结论是否准确决定着作战计划的好与坏,并影响战争的结局。为了解决目前任务分析没有统一的标准及合适方法的问题,分析了层级任务网络(HTN)在任务分析中的不足之处,给出了OOR框架进行任务细化的方法和步骤,将其作为领域知识引入HTN规划,为任务分析提供了一个有效的方法,并设计了图元素用于表示任务树中任务之间的层级关系以及时序逻辑关系。最后以空间信息支援作战为例,验证了方法的可行性和有效性。     

大型工程项目集成化管理环境下的知识协同与任务调度

将各个项目单元抽象为不同的知识源,详细分析了集成化管理环境下的知识协同问题,提出了基于权威性加权原则的知识协同处理策略,并就策略修正、协同求解等问题作了分析说明。在此基础上,采取前向调度算法和逆向调度算法相结合的迭代算法,建立了协同工作中的任务调度模型,算例证明,模型能够有效满足各约束条件下任务的增删需求。     

Transporting jobs through a two‐machine open shop

We consider the two‐machine open shop scheduling problem in which the jobs are brought to the system by a single transporter and moved between the processing machines by the same transporter. The purpose is to split the jobs into batches and to find the sequence of moves of the transporter so that the time by which the completed jobs are collected together on board the transporter is minimal. We present a ‐approximation algorithm. © 2008 Wiley Periodicals, Inc. Naval Research Logistics 2009     

Optimizing fishbone aisles for dual‐command operations in a warehouse

Unit‐load warehouses store and retrieve unit‐loads, typically pallets. When storage and retrieval operations are not coordinated, travel is from a pickup and deposit (P&D) point to a pallet location and back again. In some facilities, workers interleave storage and retrieval operations to form a dual‐command cycle. Two new aisle designs proposed by Gue and Meller (“Improving the unit‐load warehouse.” In Progress in Material Handling Research: 2006. Material Handling Industry of America, Charlotte, NC, 2006) use diagonal aisles to reduce the travel distance to a single pallet location by approximately 10 and 20[percnt] for the two designs, respectively. We develop analytical expressions for travel between pallet locations for one of these—the fishbone design. We then compare fishbone warehouses that have been optimized for dual‐command to traditional warehouses that have been optimized in the same manner, and show that an optimal fishbone design reduces dual‐command travel by 10–15%. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 54: 389–403, 2009     

考虑随机回放的卫星数传调度问题的一种求解方法

针对考虑随机回放的卫星数传调度问题,从置换空间到调度解空间的映射方法和置换空间的搜索算法两方面进行了研究.提出了一种时间窗优先的置换序列映射算法,并证明该映射算法可以将置换序列映射到调度解空间上的最优解.提出了一种遗传随机搜索算法,基于有记忆功能的随机邻域搜索,在置换空间上搜索产生优化调度的置换序列.仿真计算表明,遗传随机搜索算法可以增强遗传算法的局部搜索能力,在搜索结果上平均获得了2.72%的改进.     

基于LMI的不确定性无尾飞行器鲁棒变增益控制器设计

无尾式飞行器是飞行器发展的方向,研究无尾式控制具有重要意义.研究了线性变参数系统的增益调度控制器的设计方法,采用多胞形进行增益调度,提出了一种简单实用的变参数顶点凸分解方法,该方法在保证系统稳定的情况下,确保系统达到最优性能指标.同时还充分考虑了系统的不确定性因素,利用线性矩阵不等式(LMI)对系统进行鲁棒控制器设计,大大减少了计算量以及对系统的约束,设计出了基于LMI的增益调度控制器,通过非线性仿真结果可以看出,该控制器在调节变量变化很大的情况下,使得系统在0.5s内收敛,而且超调量很小,论证了该方法在无尾式飞控系统中应用的可行性.     

装甲火控可靠性建模

装甲武器是陆军及其两栖机械化部队实施地面突击的主要兵器,也是海军陆战部队实施抢滩登陆、岛屿攻防的主要兵器。装甲火控是装甲武器的重要组成部分,其可靠性直接影响装甲武器的打击效能。两栖装甲武器肩负海上、陆上的作战使命,使用环境更加恶劣,可靠性问题更加突出。描述了装甲火控的一般组成、功能及工作方式,基于两栖装甲武器的使用特点,分析了装甲火控基本任务、工作方式和作战环境的关系,建立了不同任务剖面的可靠性模型,为装甲火控可靠性设计、分析提供了一种参考。     

Optimal control policies in service systems with limited information on the downstream stage

Existing models in multistage service systems assume full information on the state of downstream stages. In this paper, we investigate how much the lack of such information impacts jobs' waiting time in a two‐stage system with two types of jobs at the first stage. The goal is to find the optimal control policy for the server at the first stage to switch between type‐1 and type‐2 jobs, while minimizing the long‐run average number of jobs in the system. We identify control policies and corresponding conditions under which having no or partial information, the system can still capture the most benefit of having full information.