需求不确定环境下的供应商选择与订购量分配问题优化模型及算法

设计一个同时考虑需求数量和需求时机不确定性的供应商柔性衡量方法,在此基础上以采购成本、运输成本、退货成本以及交付晚点率、废品率最小和总的供应商柔性最大为优化目标,建立了需求不确定环境下的供应商选择和订货量分配优化模型,该模型不仅可以确定最优供应商,同时还可以确定各供应商的订购量分配率,并基于模拟退火算法设计了启发式求解方法进行计算和分析。最后的算例计算证明上述模型和方法计算快捷,结果合理,从而能为企业的供应商选择问题提供科学的决策依据。     

Design of an anti-jamming GPS receiver based on orthogonal projection method

Code delay and Doppler shifted frequency could not be captured by using the conventional GPS receiver in strong interference environments because the received GPS signals which traveled a long distance are very weak. An anti-jamming GPS receiver is proposed. The interferences in the received signals are cancelled by using subspace projecting technique, and the resulting interference-free signals are processed by a weight vector which maximizes the signal-to-noise ratio. Simulation is conducted, and the resu...     

Waveform diversity based sonar system for target localization

A new monostatic army system taking advantage of diverse waveforms to improve the performance of underwater target localization is proposed.Unlike the coherent signals between different elements in common active array,the transmitted signals from different elements here are spatially orthogonal waveforms which allow for array processing in the transit mode and result in an extension of array aperture.The mathematical derivation of Capon estimator for this sonar system is described in detail.And the performance of this orthogonal-waveform based sonar is analyzed and compared with that of its phased-array counterpart by water tank experiments.Experimental results show that this sonar system could achieve 12 dB-15 dB additional array gain over its phased-array counterpart,which means a doubling of maximum detection range.Moreover,the angular resolution is significantly improved at lower SNR.     

确定事例特征权值的方法研究

针对事例特征权值的确定问题 ,提出了 Delphi和 AHP相结合的权值确定方法 ,以及二次规划模型权值确定法和信用统计权值确定法 .这些方法在事例特征权值的确定中 ,有助于减少主观性 ,增加客观性 .     

优序法在管理成果评价中的应用

在对管理成果进行评价时 ,首先要建立指标体系 ,而在这些指标当中有的可以定量描述 ,有的只能定性来描述 ,所以在评价时应当将定性和定量指标进行综合考虑。优序法就是通过对多目标决策问题进行两两相对比较 ,最后给出全部方案的优序排序。此方法应用简单 ,既能处理定量问题 ,又能处理定性问题。在建立管理成果指标体系的基础上 ,利用优序法 ,给出了管理成果评价方法。     

基于多AGENT的机器人装配系统结构

采用Ａｇｅｎｔ的基本思想,对多Ａｇｅｎｔ系统分别从个体和群体的角度出发,构造系统结构。通过对系统行为方式的定义,将全局运行流程与局部运行流程相分离,将任务的执行和任务间的协调相分离,将任务的选择与自身及状态相结合,从而系统结构可以隔离高层的系统控制与低层的执行过程,使虚拟系统在结构上具有更大灵活性,可扩充性和可重用性。     

我国证券市场混沌的判据

本文通过李雅普诺夫指数和吸引子的分数维这两个指数来研究我国证券市场的混沌特征。利用Ｗｏｌｆ提出的重构相空间技术和Ｇ－Ｐ算法分别计算了上证综指日收益率序列的李雅普诺夫指数和吸引子的分数维。从而得出我国证券市场运行于混沌状态的有力证据。     

Power-Based Arbitrary Decisional Actions in the Resolution of MIS Project Issues: A Project Manager's Action Research Perspective

As a management information systems (MIS) project manager and an action researcher, the author examined, over time, the influence on information system development (ISD) of the informal sociopolitical organizational actions. The paper reports two cases of action research findings concerning the effect on ISD project implementation processes of power-based arbitrary decisional actions in bureaucratic environments. The research focused on the relationship of such unilateral actions to the interconnected subprocesses of deliberate and conscious attempts by the ISD project members to define and resolve system implementation issues. A suggested conceptual framework for the issue-resolution processes (IRP's) and obstacle-coping processes (OCP's) is based on the author's IRP/OCP-related behavioral constructs and theoretical models dealing with soft-systems issues, especially appreciative system theory and soft-systems methodology, and innovative flexible, "complementarist" (Sinn, 1998) or pluralist problem-solving approaches.     

Evolutionary Programming for IP/MIP Problems with Linear Constraints

1. INTSODUCTIONThe common illteger programming (lP) is a mathematical model which is designed to find aset of non-negative variables to medmize (or minimize) a nonlinear objective function whilesatisfying a set of constraints under integer restrictions of variables. An lP model with somevariables reqllired to be real is a mixed integer programming (MIP).The history of solving lP/MIP problems is not very old. According to reference [1], ageneral method for solvillg such problems may not…     

利用元胞自动机模拟滩角地形

滩角是滩面上的一种特征地形.本文利用改进的元胞自动机模型,对滩角地形进行了模拟.结果表明滩角的形成过程具有自组织特征,因此滩角可以通过海滩泥沙、地形与波、流的自组织过程形成.指出自组织理论为从不同的侧面认识和研究海岸带现象与过程提供了一扇窗口.