共查询到20条相似文献,搜索用时 218 毫秒
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文章给出了电动机的几种启动方式,并分析了其特性,着重介绍了软启动。但本文的目的是解决电动机的重载启动,并给出了一种交-交变频的方法来实现。 相似文献
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本文举例论述了“一题多解”在数学教学中的重要作用。对极值问题,给出了四种解法;对积分问题,给出了八种解法。通过多种方法,求解选编的综合题,培养学生综合解题能力。 相似文献
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讨论了企业竞争力的一种模糊评价方法,归纳了影响竞争力评价的因素。给出了一种应用于企业竞争力评价的指标体系和模糊评价方法,运用主成分分析法确定各指标的权重,为企业竞争力评价提供了一种定量分析方法。 相似文献
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文章阐述了一种可变参数的 PI 算法,基于该算法用单片机对燃油炉炉温进行过零控制。文章给出了单片机控制的接口电路及其程序框图。 相似文献
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This paper focuses on the joint pricing and procurement of fashion products in the existence of clearance markets. It is assumed that the expected regular season demand is a linear decreasing function of the price and the end of period excess inventory is sold at a known discounted price in a clearance market where the demand is a random variable that follows a general distribution. It is shown that the expected profit function is unimodal and the optimal procurement quantity and price can be found from the first order conditions. Existence of a clearance market increases the profit, price, and the procurement quantity. In order to prove this, the optimal procurement and pricing policy of a price-setting retailer who does not have a clearance market is provided. As opposed to the literature, it is shown that the expected profit function of this problem is unimodal as well. A numerical study demonstrating the magnitude of the increase in profit, procurement quantity, and price is reported. 相似文献
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Modeling the response capability of a production system 总被引:1,自引:1,他引:0
Pedro Palominos Luis Quezada Germn Moncada 《International Journal of Production Economics》2009,122(1):458
This work is aimed at investigating the impact of labor flexibility and machine flexibility in the response capability of a production system in the clothing industry. To do this the response capability of a production system is modeled as a function of different flexibilities. From this model a 32 factorial experimental design is configured, which is implemented in the Arena 7.01 simulation language. The results show greater importance of machine flexibility compared to labor flexibility for the types of variability studied, and the performance of a production system when a high level of flexibility is used is similar to that in which a medium level is used. 相似文献
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Josie Fisher Author Vitae 《Industrial Marketing Management》2007,36(1):99-108
This paper focuses on the common though ethically problematic practice of suppliers providing gifts and other benefits to buyers in a business-to-business context. It is argued that contrary to the claim that the boundary between acceptable and unacceptable practices is blurred when there is a focus on developing mutually beneficial, long-term relationships between suppliers and their business customers, there is a straightforward decision making procedure that can be applied. Central to this decision making procedure is the concept of a conflict of interest. While all organisations have very good reasons to address the issue of gifts and benefits, in a relationship marketing context there is even more reason to do so. 相似文献
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经济系统的资源位凹集模型及其政策含义 总被引:6,自引:1,他引:6
本文首先论述了“系统经济,整合为王”的基本思想;在此基础上提出了经济系统的资源位凹集模型把经济系统的实际资源位结构构造成凹集是整合在所有权意义上不属于自己的资源的必要条件,这为如何发展系统经济指明了方向;根据这个模型,推广了国际贸易理论的Heckscher-Ohlin定理,提出了如何应对经济全球化和如何在国际分工中获得最大的国家利益的对策性建议和必须进行的观念转变;最后,在对科斯企业理论进行认真分析的基础上,提出了企业凹集模型,进一步指出在系统经济条件下,整合资源的能力是企业家的核心能力的新理念。 相似文献
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本文以普通花键滚刀为例,从理论上分析了滚刀法向齿形检测剖面。通过分析并进行计算得出:同一滚刀基本蜗杆,节圆柱上不同螺旋线的法剖面截形有明显差别;如果以齿纹中点法剖面作为齿形检测和设计剖面,用平面啮合法设计花键滚刀时,则齿形误差最小。 相似文献
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Brian C. Twiss 《Journal of Product Innovation Management》1984,1(1):19-29
How many times is a forecast of a technological development correct? According to many experienced managers, it almost never is. Then what good is a forecast? A forecast helps make important innovation decisions, according to Brian C. Twiss. He argues that precision in forecasting a technological development is seldom needed for purposes of long-term planning and that any innovation so marginal that small errors in forecasting will make a big difference should not be considered anyway. Twiss suggests that technology forecasting can be of real value once it is accepted that it is essentially concerned with modeling human behavior. This is the unexpected viewpoint that Twiss presents in this article. He explains how to develop and how to use a technology forecast in long-range planning. 相似文献
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本文研究了由1个制造商和1个零售商组成的供应链中的竞争与合作定价问题,其中制造商具有平台直销渠道。本文建立了竞争下的Stackelberg博弈模型,并分析了解的唯一性和合理性,然后给出合作定价模型和各渠道的定价策略,结果表明制造商和零售商最优策略是降低线下渠道销售价格而线上平台销售价格不变。通过对比表明供应链合作所增加的收益等于非合作下零售商的收益,并证明了顾客对线下渠道购买偏好越高,合作所增加的收益越大。进一步地,分析了在合作的情况下制造商是否放弃通过平台直销渠道销售商品的问题,并给出双渠道下供应链总利润比单渠道下总利润高的判定条件。最后给出一个算例,对所获得的结论进行验证和补充。 相似文献
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论中国世界工厂及其对策 总被引:31,自引:0,他引:31
目前,中国正在迅速成为世界工厂。不过,当前“中国世界工厂”乃是中国迅速成为跨国公司“世界性生产基地”的同意语,中国离真正世界工厂还道路漫长,要建立真正意义上的世界工厂,必须以划时代的新技术革命为基础,把自身工业化和引进工业化结合起来,实现自身工业化和引进工业化的时代发展,这既是中国世界工厂的捷径,也是中国世界工厂的新发展道路。 相似文献