全文获取类型
收费全文 | 563篇 |
免费 | 68篇 |
国内免费 | 3篇 |
出版年
2022年 | 5篇 |
2021年 | 12篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2017年 | 13篇 |
2016年 | 11篇 |
2015年 | 16篇 |
2014年 | 12篇 |
2013年 | 122篇 |
2012年 | 18篇 |
2011年 | 14篇 |
2010年 | 24篇 |
2009年 | 13篇 |
2008年 | 23篇 |
2007年 | 12篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 11篇 |
2003年 | 6篇 |
2001年 | 8篇 |
2000年 | 8篇 |
1999年 | 11篇 |
1998年 | 11篇 |
1997年 | 17篇 |
1996年 | 18篇 |
1995年 | 18篇 |
1994年 | 14篇 |
1993年 | 13篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 6篇 |
1988年 | 5篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1983年 | 5篇 |
1982年 | 9篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1973年 | 7篇 |
1972年 | 9篇 |
1971年 | 9篇 |
1970年 | 6篇 |
1969年 | 8篇 |
1968年 | 5篇 |
1967年 | 5篇 |
1966年 | 5篇 |
排序方式: 共有634条查询结果,搜索用时 156 毫秒
51.
52.
吕锐 《国防科技大学学报》1988,10(4):97-106,120
模型的定阶问题是时间序列分析(包括参数谱估计、系统辨识,回归分析)研究领域中的一个重要问题。本文对现有的数种模型定阶方法,进行了分析、讨论和归纳,指出了它们所适用的场合及优劣。 相似文献
53.
Products with short life cycles are becoming increasingly common in many industries, such as the personal computer (PC) and mobile phone industries. Traditional forecasting methods and inventory policies can be inappropriate for forecasting demand and managing inventory for a product with a short life cycle because they usually do not take into account the characteristics of the product life cycle. This can result in inaccurate forecasts, high inventory cost, and low service levels. Besides, many forecasting methods require a significant demand history, which is available only after the product has been sold for some time. In this paper, we present an adaptive forecasting algorithm with two characteristics. First, it uses structural knowledge on the product life cycle to model the demand. Second, it combines knowledge on the demand that is available prior to the launch of the product with actual demand data that become available after the introduction of the product to generate and update demand forecasts. Based on the forecasting algorithm, we develop an optimal inventory policy. Since the optimal inventory policy is computationally expensive, we propose three heuristics and show in a numerical study that one of the heuristics generates near‐optimal solutions. The evaluation of our approach is based on demand data from a leading PC manufacturer in the United States, where the forecasting algorithm has been implemented. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004. 相似文献
54.
针对水下距离选通激光图像光学相关识别技术的应用,研究了引起图像畸变从而导致光学相关识别相关峰输出效率降低的若干因素,并通过实验的方法采集了不同系统参数设置下的激光成像图片,然后采用相位匹配的方法对图片进行相关性分析,同时应用PCE、Disc等指标联合评价输出的相关峰质量,从而衡量各因素所引起的成像畸变对光学相关识别性能的影响程度.MATLAB软件仿真结果证明:激光单脉冲能量、ICCD增益、成像距离等因素变化均会引起图像相位特征畸变,导致相关识别鉴别率降低.该结果可为建立水下距离选通成像系统控制模型和设计匹配滤波器提供参考. 相似文献
55.
56.
57.
We consider a make‐to‐order manufacturer facing random demand from two classes of customers. We develop an integrated model for reserving capacity in anticipation of future order arrivals from high priority customers and setting due dates for incoming orders. Our research exhibits two distinct features: (1) we explicitly model the manufacturer's uncertainty about the customers' due date preferences for future orders; and (2) we utilize a service level measure for reserving capacity rather than estimating short and long term implications of due date quoting with a penalty cost function. We identify an interesting effect (“t‐pooling”) that arises when the (partial) knowledge of customer due date preferences is utilized in making capacity reservation and order allocation decisions. We characterize the relationship between the customer due date preferences and the required reservation quantities and show that not considering the t‐pooling effect (as done in traditional capacity and inventory rationing literature) leads to excessive capacity reservations. Numerical analyses are conducted to investigate the behavior and performance of our capacity reservation and due date quoting approach in a dynamic setting with multiple planning horizons and roll‐overs. One interesting and seemingly counterintuitive finding of our analyses is that under certain conditions reserving capacity for high priority customers not only improves high priority fulfillment, but also increases the overall system fill rate. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 相似文献
58.
We consider a general linear filtering operation on an autoregressive moving average (ARMA) time series. The variance of the filter output, which is an important quantity in many applications, is not known with certainty because it depends on the true ARMA parameters. We derive an expression for the sensitivity (i.e., the partial derivative) of the output variance with respect to deviations in the model parameters. The results provide insight into the robustness of many common statistical methods that are based on linear filtering and also yield approximate confidence intervals for the output variance. We discuss applications to time series forecasting, statistical process control, and automatic feedback control of industrial processes. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010 相似文献
59.
60.
In this paper, we derive new families of facet‐defining inequalities for the finite group problem and extreme inequalities for the infinite group problem using approximate lifting. The new valid inequalities for the finite group problem include two‐ and three‐slope facet‐defining inequalities as well as the first family of four‐slope facet‐defining inequalities. The new valid inequalities for the infinite group problem include families of two‐ and three‐slope extreme inequalities. These new inequalities not only illustrate the diversity of strong inequalities for the finite and infinite group problems, but also provide a large variety of new cutting planes for solving integer and mixed‐integer programming problems. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 相似文献