Schedule evaluation in unstable manufacturing environments

This paper provides a new approach to validate the feasibility of schedules of multiple-step mixed-model unstable manufacturing environments with different changeover times. Traditionally, continuous lines in a manufacturing process run the same sequence in order to minimize WIP inventory and lead time. Nevertheless, multiple reasons such as different product mixes or setup times can lead managers to run different sequences in continuous lines. Unfortunately, lack of reliability of supply and demand in these environments makes it difficult to manage product inventories and often leads to starvation due to the discoordination between the schedules of both lines. This approach is based on a new type of visual representation of schedules and an estimate the probability of starvation. It assumes stochastic supply and demand and a predefined schedule sequence based on batches of different sizes.     

美国对外贸易政策变迁轨迹研究(1776-1940)

本文主要是研究美国对外贸易政策变迁轨迹(1776-1940),包括美国对外贸易政策的背景、从1776-1940年的美国对外贸易政策、美国对外贸易政策对工业和农业的影响。     

智能制造对企业颠覆性创新的作用机理——来自扎根理论的海尔案例研究

在新一轮科技革命浪潮中,制造企业基于智能制造带来的颠覆性创新效应,既能把握市场先机,也易于实现“创新逆袭”。智能制造如何赋能企业颠覆性创新?围绕这一问题,以海尔集团深度访谈质性数据为基础,采用扎根理论对一手数据与二手数据进行编码,结果发现,生产模式变革、组织结构演化、合作网络创新是颠覆性创新的重要影响因素。由此,构建智能制造企业颠覆性创新理论模型,解析智能制造企业颠覆性创新实现与演化机理,以期为新时代背景下,中国企业更好地激发自身智能制造潜能,推动颠覆性创新提供参考。     

银行主导型金融对制造业企业技术进步的影响——基于技术距离的视角

制造业企业的技术发展离不开适宜类型的金融支持。那么,我国以商业银行为主导的金融体系对其具有怎样的影响？本文从技术距离视角出发,通过构建熊彼特内生增长模型探究银行主导型金融体系对制造业企业技术进步的影响效应及作用机理,并运用中国工业企业数据库与城市数据库的匹配数据进行实证检验。研究发现：当制造业企业远离技术前沿时,银行主导型金融对其技术进步具有明显的促进作用,但随着企业接近技术前沿,该作用将由正转负。相较于国有和抵押资产丰富的制造业企业,银行主导型金融对技术进步的负向作用在非国有和抵押资产匮乏企业中出现较早。机制检验表明,在远离技术前沿阶段,银行主导型金融能够激励制造业企业创新从而促进其技术进步,但在接近技术前沿后,银行主导型金融难以通过激励企业创新驱动其技术进步。研究结论对如何深化金融供给侧结构性改革、增强金融服务制造业之功效具有一定的指导意义。     

基于空间自相关的滇中城市群县域经济发展研究

针对县域经济研究方法较为单一,基于滇中城市群2003—2012年县域人均GDP数据,采用结合时空尺度的全局和局部空间自相关研究方法,对于县域经济发展时空特征进行分析和评价。分析结果表明,滇中城市群县域经济在全局和局部空间上都表现为较强的正相关性质,县域经济在时空上的联系日益密切,但中心城市的经济集聚和扩散辐射效应较弱,经济欠发达的县域单元数量仍比较多。该方法能够为滇中城市群县域经济发展战略制定提供参考,并提出合理的对策和建议。     

专业化、多样化与产业增长关系——基于中国省级制造业面板数据的实证研究

本文利用中国31个省区169个制造业在1999~2009年的数据,实证分析了专业化、多样化和竞争程度等因素对制造业增长的影响。研究结果表明,在全国样本范围内,专业化(MAR外部性)对制造业增长的影响为负,而多样化的产业环境(Jacobs外部性)和竞争(Porter外部性)有利于制造业的增长。在分地区、分产业和分地区分产业的分析中,专业化和多样化对不同地区和不同类型的制造业增长的影响存在显著差异,但是竞争对制造业的增长始终具有显著正面效应。     

北京市中心城区教育及科技行业集聚研究

城市内部教育科研机构及高科技企业的集聚是区域创新体系发展和城市经济、空间发展的重要推动力.为考察北京市中心城区教育及科技行业基本单位的集聚和分布特点,采用Arcgis的空间统计分析工具分析了信息传输、计算机服务和软件业,科学研究、技术服务和地质勘查业以及教育业三类相关行业的Moran'8 I,Local Moran I...     

Dynamic technological learning trends in Turkish manufacturing industries

Efficient development of industries requires a broad range of technological capabilities which can be acquired only by a long process of learning. Continuous measuring and monitoring of the ever-changing technological learning would be useful for building technological capability and managing technological policies. Nevertheless, research on how to measure the technological learning over time at macro levels remains largely untouched. In this paper, by adding the experience curve into the multifactor productivity part of Neoclassical production function, we will develop a model which will allow one to estimate the technological learning levels over long periods. This model would allow a user to both estimate the past learning experiences and forecast its future path on a time varying basis. The model has been used and tested in the estimation of the annual technological learning values for 28 Turkish manufacturing industries from 1981 to 2000.     

块状世界的经济学——空间经济学点评

The major subjects of the Spatial Economics are studying the spatial distributions of economic activities, investigating those factors and mechanism determining the spatial style of economic activities, and reintroducing the spatial factor neglected by the Mainstream Economics for a long period into the general equilibrium frame. This paper presents the main research object of the Spatial Economy, as well as its＇ foundations, the catalog and artifice of those theoretical models, and main insights of the Spatial Economy, evaluates the theoretical improvement of the Spatial Economy in brief.