液动冲压发射系统发射过程仿真分析

为了研究液动冲压发射系统的工作特点,分别建立了该发射系统的主要组件如蓄压器、发射阀、冲压器的数学模型。在此基础上,进行了整个液动冲压发射系统发射过程的仿真计算,并对仿真结果进行了分析。结果表明:所建立的数学模型正确,基本反映了发射过程中的各主要部件的动态特性。这些模型不仅可用于分析液动冲压发射系统的工作特性,还可为该系统的总体论证与关键部件的设计提供理论依据。     

基于度量元的静态软件缺陷预测技术

软件缺陷预测技术是当前软件工程领域的一个热点研究问题。回顾和综述了基于度量元的静态软件缺陷预测技术研究的起源与国内外最新进展动态,并对常用缺陷预测技术的评价指标进行对比和分析,指出其优缺点和适用范围。最后对静态软件缺陷预测技术的可能发展方向进行预测。     

平面图形对象拾取算法研究

介绍了在图形处理中,利用面向对象技术实现的平面图形对象拾取算法。与传统的以大量图像信息的存储为基础的位图存储方式下的图形对象拾取算法相比,本算法不但包括单个图形对象的拾取,而且也探讨了在复杂的图形组合下,如在图形重叠与覆盖的情况下进行多个图形对象拾取所需解决的算法难点。本算法对提高图像信息的存储效率和图形对象拾取的质量,对图像科学与面向对象技术的发展具有实际意义。     

分布式结点自组织时分多址算法

提出了一种分布式结点自组织时分多址算法,并论证了算法的正确性和功效。     

Environmental regulation in project‐based industries

We study the environmental regulation of industrial activities that are organized as projects. Applications arise in construction, ship and aircraft building, and film making, among other industries. Relative to manufacturing, environmental regulation is different in project‐based industries, due to the uniqueness and geographical diversity of projects, and a lack of product takeback programs. Because the amount of waste and pollution generated by project companies can be large, regulators need environmental policies to ensure reduction of waste and pollution. We consider a regulator who attempts to maximize social welfare. We model this problem as a bilevel nonlinear program. The upper level regulator specifies waste reduction targets, which the lower level project companies meet using waste stream reduction and remediation of pollution, while attempting to control their project costs. We find that high waste diversion targets lead to outcomes with little pollution, but excessive project costs and only modest waste stream reduction. Projects that have lower task precedence density, or that have pollutants with different environmental impacts, show larger increases in project cost and time resulting from regulation. We describe a subsidy for waste stream reduction that coordinates the system, and we estimate the value of coordination. We also describe a bonus that encourages truthful reporting by project companies, and evaluate the relative cost and effectiveness of the subsidy and the bonus. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 228–247, 2015     

Modeling and solution for the ship stowage planning problem of coils in the steel industry

We consider a ship stowage planning problem where steel coils with known destination ports are to be loaded onto a ship. The coils are to be stowed on the ship in rows. Due to their heavy weight and cylindrical shape, coils can be stowed in at most two levels. Different from stowage problems in previous studies, in this problem there are no fixed positions on the ship for the coils due to their different sizes. At a destination port, if a coil to be unloaded is not at a top position, those blocking it need to be shuffled. In addition, the stability of ship has to be maintained after unloading at each destination port. The objective for the stowage planning problem is to minimize a combination of ship instability throughout the entire voyage, the shuffles needed for unloading at the destination ports, and the dispersion of coils to be unloaded at the same destination port. We formulate the problem as a novel mixed integer linear programming model. Several valid inequalities are derived to help reducing solution time. A tabu search (TS) algorithm is developed for the problem with the initial solution generated using a construction heuristic. To evaluate the proposed TS algorithm, numerical experiments are carried out on problem instances of three different scales by comparing it with a model‐based decomposition heuristic, the classic TS algorithm, the particle swarm optimization algorithm, and the manual method used in practice. The results show that for small problems, the proposed algorithm can generate optimal solutions. For medium and large practical problems, the proposed algorithm outperforms other methods. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 564–581, 2015     

船体腐蚀图像匹配算法的研究

船体腐蚀图像分析是计算机图像处理在船体腐蚀领域的一个应用技术．该文主要研究了船体腐蚀中断层图像匹配算法的设计与实现．该算法对于研究船体腐蚀的形成和分析具有十分重要的意义．     

斜体素体视技术在腐蚀图像合成中的应用研究

图像合成是计算机图像处理领域的一个关键课题．该文提出了一种基于科体素体视技术的图像合成算法．该算法对于研究船体腐蚀图像的合成具有十分重要的意义．     

导弹仿真试验结果静态一致性检验及其置信度

分析了仿真试验结果与飞行试验结果进行静态一致性检验的方法,分为参数方法和非参数方法。然后讨论一致性检验的置信度,给出了置信度与弃真概率和采伪概率的关系并说明要选择恰当的显著性水平,以保证检验的置信度具有合理性。     

闭环校射仿真与试验

提出了一种可行的闭环校射火控模型,分析了导致脱靶量产生的诸多因素,并建立了简单可用的数学模型,据此来对脱靶量进行仿真。接着重点描述了如何实现闭环火控,通过仿真和实验,说明了该火控模型的可行性和正确性。