基于权重的AHP判断矩阵一致性调整方法

传统的判断矩阵调整方法计算得到的权重不能最大限度地保留原始判断矩阵的信息。为此,提出一种基于权重的判断矩阵调整方法。该方法根据权重的性质,构造完全一致矩阵,利用AdaGrad最速下降法对矩阵进行拟合,使该矩阵相对于原始判断矩阵的总改变量最小,以其对应的权重作为矩阵的计算结果。数值计算结果表明,该方法相比于其他方法,权重对原始判断信息的保留度更高,且不需要反复进行矩阵一致性检验。     

科学计算可视化在水下可视化战场建设中的应用

科学计算可视化作为一门新兴应用科学,为水下可视化战场建设提供了一种新的表达手段。首先介绍了科学计算可视化的基本概念,然后通过对其在水下战场建设领域的应用举例,展现了科学计算可视化在该领域的应用前景及其对潜艇战术发展的巨大推动作用。     

数字化坦克营作战能力灰色聚类评估

评估数字化坦克营的作战能力对推动数字化装甲部队建设、提高部队战斗力具有一定的现实意义。以灰色系统理论为基础,将层次分析法和灰色评估法相结合,建立了数字化坦克营的灰色聚类评估模型,论述了利用该模型进行评估的基本步骤,结合实例对数字化坦克营作战能力进行了聚类评估,提出了提高数字化坦克营作战能力的方法。评估结果比较符合实际情况,证明了该模型的正确性。     

基于评价指标模糊集的复杂系统效能评估方法研究

提出了一种基于评价指标模糊集的复杂系统效能评估方法。该方法利用系统评价指标的模糊性构造模糊集,以模糊集贴近度来定义评价指标的模糊隶属度函数,结合模糊层次分析法,提出了一种适用于复杂系统功能与多层评估指标体系的效能评估新方法。仿真应用的结果表明:该方法行之有效,具有较好的实用前景。     

在越轨行为之外:大学生隐性逃课的社会学分析

隐性逃课是指学生上课时消极参与课堂教学的精神旷课行为,多被认为是越轨行为的一种表现。从社会学视角切入,对大学生隐性逃课问题进行分析,发现将隐性逃课视作越轨行为实际上是学术研究和教学实践过程中简单定性的结果,是对隐性逃课性质的片面反映。这种越轨定性导致了对隐性逃课功能认识、原因分析和应对路径设计的偏离。大学生隐性逃课具有社会根源,是多元社会与高校统一管理之间的张力以及大学无用论和信任危机的产物。在越轨属性之外,大学生隐性逃课还是一种去学校化的反抗和师生之间的默契妥协。因此,对于大学生隐性逃课,应将其置放在社会背景中加以思考,引发人们对社会根源和社会规则本身的关注。     

基于模糊综合评判的战场目标价值研究

现代战场目标繁多,从价值分析角度出发,建立了基于模糊综合评判的战场目标价值评估模型,并结合实例说明了该方法的具体应用,为指挥员和决策机关制定正确的策略提供了科学的依据.     

面向NCW的C2参考模型研究

对C2系统仿真及评价而言,在网络中心战背景下构建一个良好的参考模型是目前C2领域研究中的瓶颈问题.以过程模型及MOM框架为核心构建了面向复杂网络的C2系统概念性模型框架.在构筑抽象的C2过程模型框架基础上,借鉴认知决策(RPD)模型的概念,从感知分析及参数估计、态势评估、模式匹配、行为确定四个方面对C2过程模型进行了形式化描述,同时从个体信息能力度量、个体态势感知能力度量、个体决策能力度量、个体指挥引导能力度量、信息共享能力度量、态势共享能力度量、协同决策能力度量、作战意图共享能力度量、作战意图同步能力度量9个方面对C2 MOM框架进行了分析.     

基于数值模拟的拔伸成形工艺分析与优化

变薄拔伸是厚壁深筒件生产的关键工序,成形难度大.针对现行的拔伸成形工艺,为改善成形稳定性、提高成形质量、延长模具寿命,通过采用刚粘塑性有限元法,根据不同参数和条件,在计算机上对拔伸工艺进行数值模拟分析,分别讨论了拔伸模圈道数、变形量分配、模圈间距及入模角等因素对拔伸成形过程的影响,进而提出了"多模短距长拔"、变形量依次递减和较小入模角等优化措施.这样既减少了大量现场试验,又达到了工艺优化的目的.     

Simultaneous determination of production and maintenance schedules using in‐line equipment condition and yield information

In many manufacturing environments, equipment condition has a significant impact on product quality, or yield. This paper presents a semi‐Markov decision process model of a single‐stage production system with multiple products and multiple maintenance actions. The model simultaneously determines maintenance and production schedules, accounting for the fact that equipment condition affects the yield of each product differently. It extends earlier work by allowing the expected time between decision epochs to vary by both action and machine state, by allowing multiple maintenance actions, and by treating the outcome of maintenance as less than certain. Sufficient conditions are developed that ensure the monotonicity of both the optimal production and maintenance actions. While the maintenance conditions closely resemble previously studied conditions for this type of problem, the production conditions represent a significant departure from earlier results. The simultaneous solution method is compared to an approach commonly used in industry, where the maintenance and production problems are treated independently. Solving more than one thousand test problems confirms that the combination of both features of the model—accounting for product differences and solving the problems simultaneously—has a significant impact on performance. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

Dynamic evacuation routes for personnel on a naval ship

We propose a dynamic escape route system for emergency evacuation of a naval ship. The system employs signals that adapt to the causative contingency and the crew's physical distribution about the ship. A mixed‐integer nonlinear programming model, with underlying network structure, optimizes the evacuation process. The network's nodes represent compartments, closures (e.g., doors and hatches) and intersections, while arcs represent various types of passageways. The objective function integrates two potentially conflicting factors: average evacuation time and the watertight and airtight integrity of the ship after evacuation. A heuristic solves the model approximately using a sequence of mixed‐integer linear approximating problems. Using data for a Spanish frigate, with standard static routes specified by the ship's designers, computational tests show that the dynamic system can reduce average evacuation times, nearly 23%, and can improve a combined measure of ship integrity by up to 50%. In addition, plausible design changes to the frigate yield further, substantial improvements. Published 2008 Wiley Periodicals, Inc. Naval Research Logistics 2008