液体火箭发动机故障检测和诊断中数据挖掘策略的分析

分析了液体火箭发动机的工作特点,提出了应用数据挖掘方法从数据仓库的角度对液体火箭发动机进行故障检测和诊断的策略。对在液体火箭发动机故障检测和诊断的不同问题中可能应用的数据挖掘方法进行了分析比较。分析表明,聚类、分类、关联、时间序列分析和孤立点检测等数据挖掘方法适用于液体火箭发动机的故障检测和诊断。     

自动消防系统在大型聚集场所火灾中的应用

分析大型公共聚集场所(如商场、会展中心、写字楼、公共娱乐场所等)火灾事故特点,并有针对性地说明了自动消防系统的作用,着重阐述了在火灾抢险救援中如何充分利用这些设施,以减少人员伤亡和财产损失,提高灭火成效。     

高校科研工作中落实科学发展观的思考

科研管理工作要严格遵循科学发展观,在科研工作中坚持以人为本,树立人才是第一资源的思想,转变科研管理重物轻人的观念,努力营造宽松宽容的学术环境。正确理解科研工作在高校发展中的地位和作用,处理好科研与教学的关系、基础科研与应用科研之间的关系、自然科学与哲学社会科学之间的关系。建立健全科学、合理的科研工作评价机制。     

试论李白乐府诗歌的思想风格

李白乐府诗歌在对汉魏乐府继承发展的基础上有所创新,李白乐府在思想内容方面形成独特风格,最主要的特点体现为一个“真”字。     

Evaluating methods for the reliability of a large 2‐dimensional rectangular k‐within‐consecutive‐(r,s)‐out‐of‐(m,n):F system

A 2‐dimensional rectangular k‐within‐consecutive‐(r, s)‐out‐of‐(m, n):F system consists of m × n components, and fails if and only if k or more components fail in an r × s submatrix. This system can be treated as a reliability model for TFT liquid crystal displays, wireless communication networks, etc. Although an effective method has been developed for evaluating the exact system reliability of small or medium‐sized systems, that method needs extremely high computing time and memory capacity when applied to larger systems. Therefore, developing upper and lower bounds and accurate approximations for system reliability is useful for large systems. In this paper, first, we propose new upper and lower bounds for the reliability of a 2‐dimensional rectangular k‐within‐consecutive‐(r, s)‐out‐of‐(m, n):F system. Secondly, we propose two limit theorems for that system. With these theorems we can obtain accurate approximations for system reliabilities when the system is large and component reliabilities are close to one. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005     

A branch and bound algorithm for sector allocation of a naval task group

A naval task group (TG) is a collection of naval combatants and auxiliaries that are grouped together for the accomplishment of one or more missions. Ships forming a TG are located in predefined sectors. We define determination of ship sector locations to provide a robust air defense formation as the sector allocation problem (SAP). A robust formation is one that is very effective against a variety of attack scenarios but not necessarily the most effective against any scenario. We propose a 0‐1 integer linear programming formulation for SAP. The model takes the size and the direction of threat into account as well as the defensive weapons of the naval TG. We develop tight lower and upper bounds by incorporating some valid inequalities and use a branch and bound algorithm to exactly solve SAP. We report computational results that demonstrate the effectiveness of the proposed solution approach. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

空域频域不确定条件下电磁探测卫星规划方法研究

电磁探测卫星对区域目标的覆盖搜索在反恐及海上搜救等领域发挥着重要作用.针对电磁探测卫星区域搜索任务中存在的空域频域不确定性,构建了电磁探测卫星区域搜索问题(EDSASP)中不确定因素的量化描述模型及决策要素模型,提出了基于贝叶斯决策的电磁卫星任务规划方法,并以信息探测收益和前端截获收益为优化目标,建立了空域频域不确定条...     

A combination of Lagrangian relaxation and column generation for order batching in steelmaking and continuous‐casting production

This article considers the order batching problem in steelmaking and continuous‐casting production. The problem is to jointly specify the slabs needed to satisfy each customer order and group all the slabs of different customer orders into production batches. A novel mixed integer programming model is formulated for the problem. Through relaxing the order assignment constraints, a Lagrangian relaxation model is then obtained. By exploiting the relationship between Lagrangian relaxation and column generation, we develop a combined algorithm that contains nested double loops. At the inner loop, the subgradient method is applied for approximating the Lagrangian dual problem and pricing out columns of the master problem corresponding to the linear dual form of the Lagrangian dual problem. At the outer loop, column generation is employed to solve the master problem exactly and adjust Lagrangian multipliers. Computational experiments are carried out using real data collected from a large steel company, as well as on large‐scaled problem instances randomly generated. The results demonstrate that the combined algorithm can obtain tighter lower bound and higher quality solution within an acceptable computation time as compared to the conventional Lagrangian relaxation algorithm. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

依据《人民武装警察法》加强武警部队履职能力建设

武警部队依法执行国家赋予的安全保卫任务时,通常政治敏感度高、事发紧急、政策法规性强、舆论关注力度大。针对以上特点,部队要严格依据《人民武装警察法》有关规定,忠实履行职责使命,不断提高把关定向能力、核心军事能力、依法办事能力和科学管理能力。     

从《孙子兵法》管理思想看密切官兵关系的重要性

《孙子兵法》作为兵学圣典,对当前部队的日常管理具有重要的指导作用。从《孙子兵法》对自古以来官兵紧张关系的具体描述,剖析当前官兵关系紧张的成因,探讨科学解决官兵紧张关系的方法。