基于维修任务优先秩序的实时生产改善方法研究

基于传统瓶颈控制方法的局限性,介绍了一种实时瓶颈控制方法,基本思路是合理安排维修任务的优先次序,以实现有限制造资源的有效应用,并减少短期生产容量.对实时瓶颈控制框架和策略进行了推理,通过自动装配线的实证研究体现该方法的优势,案例研究得到的结果与传统的方法对比表明,该方法可以实现有效的生产改善.     

A master production scheduling procedure for stochastic demand and rolling planning horizons

The problem of interest is a one product, uncapacitated master production schedule (MPS) in which decisions are made under rolling planning horizons. Demand is stochastic and time varying, and effectiveness is measured by inventory holding, production setup, and backorder costs.Typically, in both the research literature and the business practice the stochastic nature of the problem is modeled in an ad hoc fashion. The stochastic MPS problem is usually solved by adding safety stock to production quantities obtained from a deterministic lot-sizing algorithm. Here, the stochastic nature of the problem is explicitly considered, as an optimal algorithm for solving the static probabilistic dynamic lot-sizing problem is adapted to rolling planning horizons. The resulting algorithm is found to dominate traditional approaches over a wide variety of experimental factors, reducing total costs by an average of 16% over traditional methods.     

Performance effects of using an ERP system for manufacturing planning and control under dynamic market requirements

Enterprise resource planning (ERP) systems have a controversial reputation. Critics say that even if ERP systems may be beneficial for organizations operating in stable conditions, they are surely detrimental to organizations that face dynamic market requirements. This is because ERP systems are said to impose such procedures and constraints on organizations that make business processes inflexible to change. In contrast, proponents argue that the information-processing capabilities of ERP systems are crucial for organizations that face dynamic market requirements and also that the criticized procedures and constraints actually support process reengineering. These two contradictory arguments are often found in practitioner literature, but both of them can also be supported by management theory. The central tenets of the Organic Theory of organization design imply that ERP systems should be detrimental when market requirements change frequently, whereas the principles of Rigid Flexibility Theory suggest that they should be advantageous. In this study, we use cross-sectional data from 151 manufacturing plants to determine which argument is more applicable in the context of manufacturing planning and control. The results strongly favor the use of ERP systems under dynamic market requirements. To facilitate the reconciliation of the two contradictory arguments, we discuss how the results may have been influenced by two contextual factors: the predominantly technical nature of the studied organizational system and the tight interdependence of the studied activities.     

基于安全性目标的机位分配模型及算法

以分配在同一机位的相邻两架飞机产生的冲突概率最小为优化目标，并建立了整数规划模型，利用现代优化算法-遗传算法对该问题进行求解。该算法在计算时问、并行性和结果优化程度上都有一定的优势     

THE IMPACT OF DEMAND UNCERTAINTY AND CONFIGURATION CAPACITY ON CUSTOMER SERVICE PERFORMANCE IN A CONFIGURE‐TO‐ORDER ENVIRONMENT

This paper examines the simultaneous impact of demand variability, demand skew, and configuration capacity on customer service in a configure‐to‐order environment. Simulation is done in ARENA and data are analyzed using ANOVA and MANOVA. The findings indicate that the factors studied have differential impact on performance both individually and interactively.     

基于分形维的连续语音实时分割技术

为能准确有效地判断出连续语音中各个音节的起止点,提出了一种改进的分形维计算方法,该算法将插值分形维的步长因子进一步精确到采样频率的数量级上,先求出语音分形维的最小二乘能量轨迹,再差分求其动态特征;在此基础上,设计了连续语音的两级搜索实时分割算法,并进行了基于DSP的硬件系统实验。结果证明,该算法较好地实现了语音段的实时分割和汉语音节切分,鲁棒性好,使得系统在信噪比为0 dB时音节分割准确率仍可保持在一个较高的水平上。最后开发了一个在线汉语语音标注器,借此阐述了论文工作在语音识别方面的应用。     

基于无线传感器网络的海水检测系统

针对海水检测周期长、范围小的特点,提出了使用无线传感器网络的海水指标实时在线检测方案。研究了精确检测的方法与算法,探讨了无线传感器网络节能路由协议。系统综合运用无线传感器智能信息处理技术、远程GPRS无线数据通信技术以及基于Internet显示平台的监测点管理查询技术,将功能相同或不同的传感器构成智能化传感器网络,从而全面提升了系统的自动化与监测水平。模拟实验结果表明系统具有良好的海水定量检测能力。     

多资源点物资发送计算机车辆调度系统模型

为了解决从多资源点向多需求点发送物资中的运输调度问题,本文提出了一个基于模拟过程的计算机调度系统模型以辅助日常车辆及装卸设备调度决策。其中的模拟过程运用启发式规则分配各车辆的路线。通过该系统运行产生的调度安排可以有效地减少运输和操作费用,并提高设备利用效率,减少车辆的排队等待。     

基于自动计量的煤炭销售物流实时管理系统的集成设计

销售物流系统是企业物流系统的重要组成部分,其管理的水平直接影响到企业的生产与经营。本文介绍了以计算机网络技术、条码技术、自动控制技术的集成为手段、面向煤炭销售特征的销售物流管理系统集成设计。该系统也用于类似散装运输的物流实时管理。     

一个基于Web的供应链生产规划及调度优化框架

供应链中的生产规划及调度对企业的成功至关重要。针对该问题，本文提出了一个基于Web的开放式的优化框架。该框架在缩短了生产规划及调度所需时间的同时，提高了规划和调度的质量。在实际应用中，该框架被证明能有效地提高企业的工作效率和经济效益：