全文获取类型
收费全文 | 102篇 |
免费 | 14篇 |
国内免费 | 1篇 |
出版年
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 5篇 |
2014年 | 1篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 7篇 |
2009年 | 13篇 |
2008年 | 4篇 |
2007年 | 10篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 9篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 15 毫秒
81.
Uncertainties abound within a supply chain and have big impacts on its performance. We propose an integrated model for a three‐tiered supply chain network with one supplier, one or more facilities and retailers. This model takes into consideration the unreliable aspects of a supply chain. The properties of the optimal solution to the model are analyzed to reveal the impacts of supply uncertainty on supply chain design decisions. We also propose a general solution algorithm for this model. Computational experience is presented and discussed. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007 相似文献
82.
本文专门探讨两宋时期的广南西路在边防战略地位上的重要性,从战略地位、历史沿革、军事政策、边贸活动、兵力部署、晚宋时期的蒙宋战争几个角度,分析广西南路如何从蛮荒未开的化外之地,变成南宋政府的门户。为使焦点集中,以邕州区域为重心,说明邕州区域在西南边防中的重要性,进一步明确当时广南西路在边防战略地位上的重要性与其执行情形。 相似文献
83.
We study joint preventive maintenance (PM) and production policies for an unreliable production‐inventory system in which maintenance/repair times are non‐negligible and stochastic. A joint policy decides (a) whether or not to perform PM and (b) if PM is not performed, then how much to produce. We consider a discrete‐time system, formulating the problem as a Markov decision process (MDP) model. The focus of the work is on the structural properties of optimal joint policies, given the system state comprised of the system's age and the inventory level. Although our analysis indicates that the structure of optimal joint policies is very complex in general, we are able to characterize several properties regarding PM and production, including optimal production/maintenance actions under backlogging and high inventory levels, and conditions under which the PM portion of the joint policy has a control‐limit structure. In further special cases, such as when PM set‐up costs are negligible compared to PM times, we are able to establish some additional structural properties. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005. 相似文献
84.
提出了粘弹性界面裂纹分析的相似界面单元聚缩解法。该方法在裂纹尖端附近划分相似界面单元,多层相似单元形成一个子结构;然后利用相似界面单元具有类似刚度矩阵的特点,将子结构内的大量自由度聚缩后再求解。作为算例,求解了双粘弹性材料和弹—粘弹性材料矩形板单边裂纹的拉伸问题。 相似文献
85.
The costs of many economic activities such as production, purchasing, distribution, and inventory exhibit economies of scale under which the average unit cost decreases as the total volume of the activity increases. In this paper, we consider an economic lot‐sizing problem with general economies of scale cost functions. Our model is applicable to both nonperishable and perishable products. For perishable products, the deterioration rate and inventory carrying cost in each period depend on the age of the inventory. Realizing that the problem is NP‐hard, we analyze the effectiveness of easily implementable policies. We show that the cost of the best Consecutive‐Cover‐Ordering (CCO) policy, which can be found in polynomial time, is guaranteed to be no more than (4 + 5)/7 ≈ 1.52 times the optimal cost. In addition, if the ordering cost function does not change from period to period, the cost of the best CCO policy is no more than 1.5 times the optimal cost. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005. 相似文献
86.
傅元坤 《装甲兵工程学院学报》1999,(4)
如何实施素质教育是教育改革中的重要课题,本文根据教学实际,结合教学过程和教学内容对学员进行学习指导,提出培养学员素质和能力的途径。 相似文献
87.
88.
本文分析了利用一维距离像进行目标识别的问题。通过对目标相邻的一维距离像进行幅度平方平均处理,得到比较稳定的平均距离像。然后将目标的平均距离像看作二值图像,提取它的矩特征用于分类识别。对三类飞机目标进行分类识别的结果表明该方法是可行的。 相似文献
89.
90.
李赋 《兵团教育学院学报》2001,11(3):45-49
柔石是“左联五烈士”中最具艺术潜质的作家。一般认为,他的代表作中篇小说《二月》纯熟地表现了青年知识者的追求,揭示了中国封建传统强大惯性重压下个人奋斗、人道主义理想的碰壁。但对于以主人公萧涧秋为代表的一代青年知识分子固有的人格缺失,以及由此造成的不必要的生存处境的尴尬、环境恶化,分析仍欠深人,因而遮蔽了《二月》这部作品主题意蕴应有的丰富性,也在客观上影响了对于柔石这位作家杰出艺术才能的认识。 相似文献