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随着我国经济水平的不断发展和提高,经济全球化的发展促使企业之间的竞争日趋激烈,工程建设领域中的竞争也逐渐激烈,其中,通信工程企业中的项目群管理逐渐得到发展。本文通过对通信工程项目的特点进行全面的分析,结合实际情况对通信工程项目中项目群管理的现状以及存在的问题进行分析,针对问题的管理措施提出几点参考意见。 相似文献
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针对制造系统柔性的合理确定是投资前期准备阶段的一个重要问题这一前提,引入了制造系统柔性评价方法这一概念,从加工柔性、改装柔性、其他系统的柔性三个方面详细论述了柔性特征参量,指出应用柔性特征参量可在投资的早期方案阶段较方便地获得所选系统的柔性,从而使投资决策变得方便和相对合理. 相似文献
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基于多目标决策协调模型的粒子群算法及其收敛性分析 总被引:1,自引:0,他引:1
宋素萍 《郑州轻工业学院学报(自然科学版)》2008,23(4)
PSO在求解高维多目标优化问题对有限个体用排序策略来寻找Pareto最优个体时,粒子群体中个体之间很难进行Pareto排序比较,或出现所有个体皆有Pareto最优解而无法实施正常的个体选优.为此,提出了一种基于多目标决策协调模型的粒子群算法,该算法将运筹学多目标决策的协调模型引入粒子群迭代过程,群体按协调模型使用偏好信息进行排序,而不是基于Pareto优于关系对当代群体进行个体排序.实验表明,该算法对解决高维多目标问题行之有效,且具有较快的收敛速度. 相似文献
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[目的]解决Delta机器人柔性夹持器抓取方法存在的控制精度和适应性较差等问题。[方法]以Delta机器人柔性夹持器为研究对象,提出一种多模型和改进鲸鱼算法相结合的Delta机器人柔性夹持器抓取方法。建立稳定抓取优化模型,在抓持对象表面寻求最佳接触位置。建立无损抓取优化模型,在确保稳定抓起物体的前提下使接触力尽可能地小。结合粒子群算法和鲸鱼算法求解模型。通过试验验证了所提抓取方法的优越性。[结果]所提方法不仅具有良好的控制精度,还能够适应不同形状和大小的物体,具有较高的灵活性和适应性,抓取成功率>96%,抓取损伤率为0。[结论]所提方法有效提高了Delta机器人柔性夹持器抓取方法的性能,适用于果蔬和易碎物品的分拣工作。 相似文献
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随着可穿戴技术的快速发展,对柔性锂电池的需求日益增加,将电化学性能优异的活性电极材料与柔性纳米碳基材料进行复合,是目前制备高性能柔性锂电池电极的热门研究方向。本文主要对碳纤维及其织物在锂离子和锂硫电池柔性电极材料中的研究与应用情况进行综述,总结了制备柔性复合电极材料的不同方法及其进展,包括静电纺丝技术、水热法、热处理、涂覆、磁控溅射、原子层沉积和热刻蚀等,所获得的电极材料均在某方面表现出优异性能,例如可逆容量高、循环性能优异、力学强度增强等。最后对基于碳纤维及其织物的柔性锂电池电极的未来发展提出了展望。 相似文献
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Chinese stakeholders (131) from 68 key institutions in 27 provinces were consulted in spring 2009 in an online survey of their perceptions of the barriers and opportunities in financing large-scale carbon dioxide capture and storage (CCS) demonstration projects in China. The online survey was supplemented by 31 follow-up face-to-face interviews. The National Development and Reform Commission (NDRC) was widely perceived as the most important institution in authorizing the first commercial-scale CCS demonstration project and authorization was viewed as more similar to that for a power project than a chemicals project. There were disagreements, however, on the appropriate size for a demonstration plant, the type of capture, and the type of storage. Most stakeholders believed that the international image of the Chinese Government could benefit from demonstrating commercial CCS and that such a project could also create advantages for Chinese companies investing in CCS technologies. In more detailed interviews with 16 financial officials, we found striking disagreements over the perceived risks of demonstrating CCS. The rate of return seen as appropriate for financing demonstration projects was split between stakeholders from development banks (who supported a rate of 5-8%) and those from commercial banks (12-20%). The divergence on rate alone could result in as much as a 40% difference in the cost of CO(2) abatement and 56% higher levelized cost of electricity based on a hypothetical case study of a typical 600-MW new build ultrasupercritical pulverized coal-fired (USCPC) power plant. To finance the extra operational costs, there were sharp divisions over which institutions should bear the brunt of financing although, overall, more than half of the support was expected to come from foreign and Chinese governments. 相似文献
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