全文获取类型
收费全文 | 273篇 |
免费 | 81篇 |
国内免费 | 18篇 |
出版年
2024年 | 4篇 |
2023年 | 3篇 |
2022年 | 10篇 |
2021年 | 7篇 |
2020年 | 13篇 |
2019年 | 9篇 |
2018年 | 12篇 |
2017年 | 16篇 |
2016年 | 22篇 |
2015年 | 20篇 |
2014年 | 22篇 |
2013年 | 30篇 |
2012年 | 22篇 |
2011年 | 21篇 |
2010年 | 15篇 |
2009年 | 23篇 |
2008年 | 18篇 |
2007年 | 18篇 |
2006年 | 17篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 5篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1992年 | 3篇 |
1990年 | 4篇 |
1989年 | 2篇 |
排序方式: 共有372条查询结果,搜索用时 940 毫秒
311.
312.
从科学发展观的基本内涵出发,针对基层部队建设中存在的普遍问题,从全面建设、统筹规划、保持创新三个方面进行了论证,回答了科学发展观是指导部队基层建设的灵魂这个重大问题。 相似文献
313.
O. Zeynep Akşin 《海军后勤学研究》2007,54(2):221-235
This paper derives optimal policies for when to hire, train, and lay off employees in service organizations when worker productivity appreciates deterministically or stochastically under constant, monotonic, and cyclic service demand. The model, an extension of the machine replacement problem from the engineering economy literature, uses infinite horizon linear programming to produce optimal personnel planning strategies and dual prices that characterize the workforce's economic value. The effect of employee attrition is also considered. In its valuation of human assets, unlike pure accounting approaches that only try to measure, this paper proposes an approach to capture the interaction between firm decisions pertaining to human resources and human resource value. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007 相似文献
314.
在研究XML数据处理问题上,XML查询与SQL查询的转换是一重要论题。在常规XML-TO-SQL查询转换算法基础上,分析了“翻译后优化”和“直接优化”两种不同的查询转换策略,提出了一种将Xpath路径表达式直接优化成SQL的算法。该算法将XML-TO-SQL查询转换分为两个主要阶段:预处理阶段和运行时翻译阶段。预处理阶段通过识别“双射映像”,计算“最小可辩识祖先”进行翻译前准备;运行时翻译则利用预处理阶段的结果进行路径约简。两个阶段的协作使得算法整体效率得以提高,达到翻译优化的目的。根据大数据量查询翻译对比实验的结果,该算法优于一些典型的传统翻译算法譬如Silk-Route、Xperanto等。 相似文献
315.
316.
浅谈在营区规划中对营区文化的塑造 总被引:1,自引:1,他引:0
当前在军队工程建设中,对营区规划的主导思想已形成基本一致的认识,但多从物质技术层面去理解,就营区规划单位而言,尚没有广泛认识到营区文化也是规划中的重要内容以及在营区现代化建设中起着不可替代的作用。本文针对此情况重点论述了营区文化的主要内容和重要作用,并提倡通过对营区空间形态的创造来塑造有特色的营区文化,最终创造出一个充满凝聚力的,有利于长期发展的营区环境。 相似文献
317.
A mathematical formulation of an optimization model designed to select projects for inclusion in an R&D portfolio, subject to a wide variety of constraints (e.g., capital, headcount, strategic intent, etc.), is presented. The model is similar to others that have previously appeared in the literature and is in the form of a mixed integer programming (MIP) problem known as the multidimensional knapsack problem. Exact solution of such problems is generally difficult, but can be accomplished in reasonable time using specialized algorithms. The main contribution of this paper is an examination of two important issues related to formulation of project selection models such as the one presented here. If partial funding and implementation of projects is allowed, the resulting formulation is a linear programming (LP) problem which can be solved quite easily. Several plausible assumptions about how partial funding impacts project value are presented. In general, our examples suggest that the problem might best be formulated as a nonlinear programming (NLP) problem, but that there is a need for further research to determine an appropriate expression for the value of a partially funded project. In light of that gap in the current body of knowledge and for practical reasons, the LP relaxation of this model is preferred. The LP relaxation can be implemented in a spreadsheet (even for relatively large problems) and gives reasonable results when applied to a test problem based on GM's R&D project selection process. There has been much discussion in the literature on the topic of assigning a quantitative measure of value to each project. Although many alternatives are suggested, no one way is universally accepted as the preferred way. There does seem to be general agreement that all of the proposed methods are subject to considerable uncertainty. A systematic way to examine the sensitivity of project selection decisions to variations in the measure of value is developed. It is shown that the solution for the illustrative problem is reasonably robust to rather large variations in the measure of value. We cannot, however, conclude that this would be the case in general. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 18–40, 2001 相似文献
318.
The Selection Allocation Problem (SAP) is a single period decision problem which involves selecting profit‐maximizing (or cost‐minimizing) activities from various distinct groups, and determining the volume of those activities. The activities in each group are selected subject to the availability of that group's resource, which is provided by either pooling or blending raw inputs from several potential sources. Imbedded in the decision process is the additional task of determining how much raw input is to be allocated to each group to form the resource for that group. Instances of this problem can be found in many different areas, such as in tool selection for flexible manufacturing systems, facility location, and funding for social services. Our goal in this paper is to identify and exploit special structures in the (SAP) and use those structures to develop an efficient solution procedure. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 707–725, 1999 相似文献
319.
320.
《美苏消除两国中程导弹和中短程导弹条约》的失效重创了本就脆弱的国际军控体系,对美俄战略稳定和全球军事安全带来消极影响,国际军控合作和全球军事安全迫切需要重构新的军控体系。本文立足当前国际军控现状,在分析美俄“退约”背后各方战略考量及国际军控面临的挑战,如“美国优先”理念下的霸权主义和单边主义、国际军控体系自身的脆弱性和局限性和新军事革命给全球安全增添新的变量的基础上,提出了“构建人类命运共同体”理念凝聚全球安全共识、以大国责任和义务为基础构建多层次军控体系和以多边军控体系循序推进国际军控进程等措施和建议,以期为推动国际军控合作,建立更为公平、合理、有效的国际军控体系做出贡献。 相似文献