地心甚高轨道星座构形协同捕获控制策略

针对地心甚高轨道星座构形协同捕获控制问题,基于虚拟编队方法设计了协同捕获控制策略,采用三脉冲燃耗最优轨迹规划算法对构形捕获轨迹进行协同规划;并且结合自适应全程积分滑模控制器对卫星各自转移轨迹进行跟踪控制。以10万km轨道高度的三星星座构形捕获为例进行仿真验证,仿真结果表明:该策略可以有效应用于地心甚高轨道星座构形捕获控制,能够在燃耗较少的情况下使星座中卫星同时到达各自的标称位置,同时具有较高的精度。     

A general strategic capacity planning model under demand uncertainty

Capacity planning decisions affect a significant portion of future revenue. In equipment intensive industries, these decisions usually need to be made in the presence of both highly volatile demand and long capacity installation lead times. For a multiple product case, we present a continuous‐time capacity planning model that addresses problems of realistic size and complexity found in current practice. Each product requires specific operations that can be performed by one or more tool groups. We consider a number of capacity allocation policies. We allow tool retirements in addition to purchases because the stochastic demand forecast for each product can be decreasing. We present a cluster‐based heuristic algorithm that can incorporate both variance reduction techniques from the simulation literature and the principles of a generalized maximum flow algorithm from the network optimization literature. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

基于黑板推理与分层规划的CGF模糊决策模型

计算机生成兵力具有智能行为是其最大的特点,也是当前研究的重点和难点。为了使计算机生成兵力决策的智能化水平有所提高,把复杂的决策过程进行分层规划,将各层中决策子任务的求解策略、推理策略与黑板推理方法中的多任务协同工作原理相结合,构造了基于黑板推理的计算机生成兵力决策模型。同时,也将模糊理论应用到决策模型中。有效地提高了计算机生成兵力的智能水平。     

Integrated capacity,demand, and production planning with subcontracting and overtime options

Models for integrated production and demand planning decisions can serve to improve a producer's ability to effectively match demand requirements with production capabilities. In contexts with price‐sensitive demands, economies of scale in production, and multiple capacity options, such integrated planning problems can quickly become complex. To address these complexities, this paper provides profit‐maximizing production planning models for determining optimal demand and internal production capacity levels under price‐sensitive deterministic demands, with subcontracting and overtime options. The models determine a producer's optimal price, production, inventory, subcontracting, overtime, and internal capacity levels, while accounting for production economies of scale and capacity costs through concave cost functions. We use polyhedral properties and dynamic programming techniques to provide polynomial‐time solution approaches for obtaining an optimal solution for this class of problems when the internal capacity level is time‐invariant. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

军事院校校园空间环境与特色的创造——后勤工程学院新校区概念性规划设计

军事院校担负着培养和造就高素质新型军事人才的使命,军事院校校园空间环境应有自己鲜明的特色.着重介绍了后勤工程学院新校区概念性规划设计方案的主要思想,提出了尊重自然环境条件,创建生态化、园林式的校园环境;尊重地域文化,体现历史传承和军校特色的设计理念.力求创造一个以人为本,能体现当代军事校园精神风貌的场所和空间环境,创建一种可持续发展的校园规划建设模式.     

一种能考虑动升力影响的高速艇迎浪纵向运动的数学模型

根据高速艇在静水及波浪中运动的特点,提出了高速艇迎浪纵向运动的基本假设,建立了能考虑动升力影响的高速艇迎浪纵向运动基本方程,并提出了高速艇迎浪纵向运动预报的一种新方法(滑航法),编制了理论预报程序,进行了模型试验验证研究.结果表明,中高航速时,滑航法可用于高速艇迎浪纵向运动的预报.     

梅花型布置双排抗滑桩合理桩位研究

结合滑坡推力作用下梅花型布置双排抗滑桩成拱机理对其合理桩位进行研究。参考前人对单排桩合理桩间距的研究成果,运用理论推导和数值模拟得到相邻前后排桩桩间土拱跨度的控制表达式。同时,考察了桩间距和桩排距对土拱效应的影响,并绘制了lx′-ly′区间分布图。利用双排桩在滑坡上的有效影响面积,结合区间分布图推导出合理的桩间距和桩排距。结果表明,合理的桩间距和桩排距能够使前后排桩桩间形成直接土拱,并催生间接土拱,进而使前后排桩相互配合,共同起到支挡作用。     

US strategic preferences in the early twenty-first century

This article investigates how US national security planners have envisioned the emerging strategic environment during the early twenty-first century and evaluates how their perceptions of this strategic environment have changed during these years. This conceptual evolution can be seen in how defense planners define threats, identify defense priorities, and design security strategies. Five key strategic planning documents serve as the basis for this analysis and illustrate significant shifts in how the US government has envisioned its own security requirements as well as the context within which its strategic vision will need to be realized. These planning documents are: (1) Joint Vision 2020, (2) the Bush Administration's 2002 National Security Strategy of the United States, (3) the Obama Administration's 2010 National Security Strategy, (4) US Strategic Defense Guidance entitled Sustaining US Global Leadership: Priorities for 21^st Century Defense, and (5) the US Chairman of the Joint Chiefs of Staff's Capstone Concept for Joint Operations: Joint Force 2020.     

驱护舰编队对海作战中舰载无人机任务规划

任务规划是舰载无人机作战使用的基础。根据舰载无人机作战性能特点,从作战使用的角度对舰载无人机任务规划的概念进行了诠释,提出将舰载无人机的任务规划区分为战术规划和航迹规划,给出了舰载无人机任务规划应遵循的原则以及任务规划的内容和步骤,提出了舰载无人机在驱护舰编队对海作战中可遂行的战术任务。     

基于路径规划的虚拟人上肢可触及性检查技术

针对目前虚拟人上肢可触及性检查操作烦琐、效率低的问题,提出一种RRT（Rapidly-exploring RandomTree）算法与逆向运动学算法相结合的路径规划方法,通过检测可行路径是否存在来实现人体上肢可触及性检查。给出了该方法的具体流程和关键问题的解决策略,并基于Jack软件进行了实例验证。