全文获取类型
收费全文 | 104篇 |
免费 | 19篇 |
国内免费 | 14篇 |
专业分类
电工技术 | 2篇 |
综合类 | 10篇 |
化学工业 | 2篇 |
机械仪表 | 17篇 |
建筑科学 | 1篇 |
能源动力 | 2篇 |
石油天然气 | 1篇 |
武器工业 | 1篇 |
无线电 | 9篇 |
一般工业技术 | 25篇 |
自动化技术 | 67篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 13篇 |
2012年 | 9篇 |
2011年 | 9篇 |
2010年 | 9篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 10篇 |
2006年 | 10篇 |
2005年 | 7篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1993年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有137条查询结果,搜索用时 15 毫秒
1.
针对软件产品线需求追踪方法进行了研究,基于软件产品线领域需求分析、设计、实现三个阶段的信息传播,提出了一种基于场景元模型的多层次软件产品线追踪模型,完整描述了追踪信息变化的整体框架;建立了需求—用例追踪矩阵、用例—动作追踪矩阵、动作—构件追踪矩阵;根据矩阵运算,描述了具体追踪实现过程,通过一个ATM案例验证了该方法对于软件产品线领域需求获取以及需求变更等问题的解决有较好的效果。 相似文献
2.
Scheduling a dynamic job shop production system with sequence-dependent setups: An experimental study 总被引:2,自引:1,他引:1
This paper presents the salient aspects of a simulation-based experimental study of scheduling rules for scheduling a dynamic job shop in which the setup times are sequence dependent. A discrete event simulation model of the job shop system is developed for the purpose of experimentation. Seven scheduling rules from the literature are incorporated in the simulation model. Five new setup-oriented scheduling rules are proposed and implemented. Simulation experiments have been conducted under various experimental conditions characterized by factors such as shop load, setup time ratios and due date tightness. The results indicate that setup-oriented rules provide better performance than ordinary rules. The difference in performance between these two groups of rules increases with increase in shop load and setup time ratio. One of the proposed rules performs better for mean flow time and mean tardiness measures. 相似文献
3.
In this article, a procedure for designing a lattice fuselage barrel is developed. It comprises three stages: first, topology optimization of an aircraft fuselage barrel is performed with respect to weight and structural performance to obtain the conceptual design. The interpretation of the optimal result is given to demonstrate the development of this new lattice airframe concept for the fuselage barrel. Subsequently, parametric optimization of the lattice aircraft fuselage barrel is carried out using genetic algorithms on metamodels generated with genetic programming from a 101-point optimal Latin hypercube design of experiments. The optimal design is achieved in terms of weight savings subject to stability, global stiffness and strain requirements, and then verified by the fine mesh finite element simulation of the lattice fuselage barrel. Finally, a practical design of the composite skin complying with the aircraft industry lay-up rules is presented. It is concluded that the mixed optimization method, combining topology optimization with the global metamodel-based approach, allows the problem to be solved with sufficient accuracy and provides the designers with a wealth of information on the structural behaviour of the novel anisogrid composite fuselage design. 相似文献
4.
对于MDA横切于核心业务逻辑的关注点对封装的破坏的问题,本文给出把AOP引入到MDA的扩展策略和主要方法,并对不同的扩展策略进行了比较。 相似文献
5.
6.
分析了现有PLM-ERP数据集成方法,提出了一种基于领域元模型的集成PLM-ERP数据的方法.通过领域元模型描述PLM-ERP系统间的元数据映射信息和集成业务规则.领域元模型经过解析和验证后,执行异构数据转换,可以实现PLM-ERP系统交换和共享数据.领域元模型集成方法具有可重用性,减少PLM-ERP数据集成开发工作量,低耦合性、通用性的特点. 相似文献
7.
DM_OLAP元数据管理 总被引:3,自引:0,他引:3
元数据在数据仓库和联机分析处理中扮演着重要的角色。该文介绍了自主研制的DM_OLAP系统的元数据模型,包括其设计和CWM标准化.同时,提出了基于CWM模型的DM_OLAP元数据管理系统的设计。 相似文献
8.
9.
Metamodels, also known as surrogate models, can be used in place of computationally expensive simulation models to increase computational efficiency for the purposes of design optimization or design space exploration. The accuracy of these metamodels varies with the scale and complexity of the underlying model. In this article, three metamodelling methods are evaluated with respect to their capabilities for modelling high-dimensional, nonlinear, multimodal functions. Methods analyzed include kriging, radial basis functions, and support vector regression. Each metamodelling technique is used to model a set of single output functions with dimensionality ranging from fifteen to fifty independent variables and modality ranging from one to ten local maxima. The number of points used to train the models is increased until a predetermined error threshold is met. Results show that kriging metamodels perform most consistently across a variety of functions, although radial basis functions and support vector regression are very competitive for highly multimodal functions and functions with large local gradients, respectively. Support vector regression metamodels consistently offer the shortest build and prediction times when applied to large scale multimodal problems. 相似文献
10.