发挥大企业主导作用完善粮食现代物流体系

粮食现代物流反映了一个国家的经济技术发展水平与粮食生产流通体制。我国的现代粮食物流体系与发达国家相比还比较落后,以市场机制为导向,发挥大型粮食物流企业的主导作用,可以有效整合粮食物流资源、掌控关键物流节点、促进粮食流通效率。     

Probing cultural differences in product design and consumer evaluation using repertory grid analysis

International Journal of Technology and Design Education - Culture plays an essential role in the success of product design, especially in the age of a global economy where there is a high...     

Capturing the straw in the wind: do short sellers trade on customer information?

Review of Quantitative Finance and Accounting - This study investigates whether short sellers trade the stocks of suppliers on customer information. Using the daily short-selling data derived from...     

Reformulating Environmentally Constrained Traffic Equilibrium via a Smooth Gap Function

Various government laws have recently been enacted to alleviate the environmental deterioration of transportation systems. Environmental constraint is a valid means to explicitly reflect various environmental protection requirements imposed by the government. In this paper, we examine the environmentally constrained traffic equilibrium problem (EC-TEP), which is a fundamental tool for modeling and evaluating environmental protection requirements. Specifically, we provide an equivalent reformulation for the EC-TEP. The proposed reformulation adapts the concept of gap function to simultaneously reformulate the nonlinear complementarity conditions associated with the generalized user equilibrium conditions, environmental constraints, and conservation constraints as an equivalent unconstrained optimization problem. This gap function reformulation has two desirable features: (1) it can handle a general environmental constraint structure (linear or nonlinear; link-based or area-based) and a general link and route cost structure, enhancing the modeling adaptability and flexibility; (2) it is smooth and unconstrained, permitting a number of existing efficient algorithms for its solution. A gradient-based solution algorithm with a self-regulated averaging stepsize scheme is customized to solve the reformulated unconstrained optimization problem. Numerical examples are also provided to demonstrate the modeling flexibility of the proposed EC-TEP reformulation.     

线性集成稳压器的安全应用

集成稳压器应用非常广泛,而在使用中却存在安全保护的问题,本文介绍了一些主要的保护方法,并作了简要的分析     

双重重压下六国化工盈利能力分析及突围之路探析

2012年下半年以来,由于市场不景气导致中国化工行业产品价格下降,而成本却不断攀升,企业盈利能力不容乐观,六国化工也不例外。文章对六国化工进行了介绍,并利用杜邦体系分析法等盈利能力指标对其分析,进而提出了相关建议,以便于六国化工找到突破困境的途径,获得持久的竞争优势及长期可持续发展。     

基于VAR模型的我国铜锌期货价格引导关系实证研究

铜、锌期货是大宗金属期货的重要品种,在期货投资市场上广受追捧。研究通过构建VAR模型,运用格兰杰因果检验,分析了近远月铜、锌期货价格之间相互引导关系,模型实证结论认为远月期铜、锌期货价格之间具有显著的相互引导关系,为期货市场上各类型投资者提供政策指引。     

基于遗传算法的城际客运专线列车开行方案研究

分析城际客运专线列车开行方案的特点。以旅客时间消耗最小为目标,建立城际客运专线旅客列车开行方案的最小费用流模型。根据模型的特点,设计相应的遗传算法,并对遗传算法的适应值函数、算法步骤和算法复杂度进行分析。分析结果表明,该算法是一个收敛于全局最优解的近似有效算法。