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61.
基于遗传算法的多目标集装箱多式联运运输优化模型   总被引:1,自引:0,他引:1  
杨秋秋  王辉 《物流科技》2006,29(12):29-31
基于集装箱多式联运在进行门到门的运输过程中可以选择多种运输方式和路径的组合进行优化运输这个特点,本文将多式联运的运输优化问题转化成为一个最短路径问题,以成本和时间为优化目标建立了选择最优路径的模型,并选择遗传算法作为求解算法对实例问题进行了求解验证。  相似文献   
62.
妇女作为人类生命的孕育者,对人类赖以生存的地球环境,有着息息相关的感情和强烈的责任意识,从而更容易成为环境保护的理论先驱和积极实践者。本文阐述了农村妇女与绿色农业的内在关联,认为构建绿色农业必须要大力开发农村妇女这一人力资源。  相似文献   
63.
It is shown that the joint distribution of economic and political power plays a key role in determining regulatory and tax policies of national and subnational governments. If both economic and political power are evenly distributed across individuals, then regulatory and tax policies are efficient, but if they are unevenly distributed and positively correlated, then regulatory policy is used by subnational governments to redistribute income in favor of individuals with higher economic and political power at the expense of productivity and output. Consequently, the national government has to raise the tax rate to finance public expenditure. Moreover, if there exists a positive correlation between economic and political power, then the higher the fiscal gap, the larger the gap between equilibrium and efficient policies because subnational governments underestimate more the fall of public revenues caused by inefficient policies.  相似文献   
64.
当前我国社会职业阶层结构的开放对于男性和女性有着不同的意义,代际和代内社会职业阶层流动表明,女性的总流动率和上升流动率均低于男性,女性更多地受到父代尤其是母亲职业地位的影响,而男性则更容易通过自身努力从较低的社会职业阶层跻身到职业地位的上层。由此我们可以理解尽管社会流动率在增加,但是女性与男性的社会地位仍存在着较大的差距。  相似文献   
65.
This study develops a moderation model to examine the role of a proactive environmental strategy on eco‐innovation. Drawing upon the perspectives of contingency theory, this study argues that the impacts of sustainability strategy on eco‐innovation depend on market demand, innovation intensity and government subsidy. The sample used to test the hypotheses is obtained from the Community Innovation Survey in Taiwan. A total of 2955 manufacturing firms are included in the final sample. A logit moderating regression is adopted to analyze the models. The results reveal that market demand and government subsidy positively moderate the relationship between environmental strategy and eco‐innovation. Specifically, firms are more likely to adopt a proactive environmental strategy to improve eco‐innovation under high levels of market demand and government subsidy. Furthermore, the results indicate that innovation intensity affects the effect of environmental strategy on eco‐innovation, but the direction of the influence varies with different categories of eco‐innovation. Copyright © 2016 John Wiley & Sons, Ltd and ERP Environment  相似文献   
66.
This study examines the causal relationship between Chinese money supply growth and inflation, using the bootstrap Granger full‐sample causality test and sub‐sample rolling‐window estimation test to determine whether such a relationship in China supports the quantity theory of money. The result indicates that there is a unidirectional relationship from inflation to money supply growth. However, considering structural changes in two series, we find that short‐run relationships using full‐sample data are unstable, which suggests that full‐sample causality tests cannot be relied upon. Then, we use a time‐varying rolling‐window approach to revisit the dynamic causal relationship, and the results show that money supply growth has both positive and negative impacts on inflation in several sub‐periods, and in turn, inflation has the same effects on money supply growth for China. These findings are basically consistent with the modern quantity theory of money from the perspective of money supply and price level. When money supply growth does not outweigh output growth, inflation should not be curbed only by decreasing money supply. It notes that a stable money supply growth is critical to price level stability and economic development in China.  相似文献   
67.
资源型企业和谐创新发展路径探析   总被引:3,自引:1,他引:3  
随着科学发展观的深入人心,面对资源瓶颈和企业发展与社会环境的矛盾,探讨了资源型企业的和谐创新发展路径。分析了资源型企业具有环境依赖性和地方经济依赖性的特点;在此基础上,指出资源型企业应该处理好与上下级单位、企业员工、地方政府、新闻媒体、社会、环境的关系;然后,提出资源型企业的和谐创新发展,需树立资源为贵、安全为首的理念,并从人才、研发体系、资金投入3个方面加强技术创新,从树立科学发展观、实施精细生产、延伸产业链3个方面加强管理创新。  相似文献   
68.
本文研究基于TCP/IP协议栈的嵌入式系统在网络智能设备中的测控应用设计。以Rabbit2000网络微处理器和Dynam ic C软件开发环境为例,阐述构建嵌入式W ebServer的具体技术及相关的实现方案;详细介绍了实现TCP、UDP报文进行网络通信、串行口数据通信和对网络智能设备的测控技术等,并给出系统硬件原理框图和有关软件实现的程序代码及流程图。  相似文献   
69.
Uncovered interest parity (UIP) is estimated for short‐term horizons from one month to 12 months using a large number of cross‐sectional bilateral exchange rates. In contrast to conventional time‐series UIP, cross‐sectional UIP is examined with a single‐equation estimation and panel regression model estimation. The exchange rates analyzed here include a broad spectrum of countries: developed, developing, low‐inflation, and high‐inflation countries. Based on the empirical evidence, there does not appear to be a well‐publicized UIP puzzle for cross‐sectional UIP, and the slope estimates remain largely between zero and one throughout the sample periods, with a few exceptions. Evidence of UIP is more clear for low inflation countries than for high inflation countries. As interest rate maturity becomes longer from one month to 12 months, the UIP relationship becomes weaker.  相似文献   
70.
We examine an export game where two (home and foreign) firms produce vertically differentiated products. The foreign firm is more R&D efficient and is based in a larger and richer market. The unique (risk‐dominant) Nash equilibrium exhibits intra‐industry trade, and the foreign producer manufactures a higher‐quality product. When transport costs are low, unilateral dumping by the foreign firm arises; otherwise, reciprocal dumping occurs. For some parameters, a domestic antidumping policy leads to a quality reversal in the international market whereby the home firm becomes the quality leader. This policy is desirable for the implementing country, though world welfare decreases.  相似文献   
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