全文获取类型
收费全文 | 103篇 |
免费 | 21篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 4篇 |
综合类 | 8篇 |
化学工业 | 9篇 |
机械仪表 | 5篇 |
建筑科学 | 2篇 |
能源动力 | 1篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
武器工业 | 6篇 |
无线电 | 35篇 |
一般工业技术 | 17篇 |
自动化技术 | 44篇 |
出版年
2023年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 9篇 |
2013年 | 17篇 |
2012年 | 13篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 5篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有133条查询结果,搜索用时 279 毫秒
1.
AbstractData mining techniques have been successfully utilized in different applications of significant fields, including medical research. With the wealth of data available within the health-care systems, there is a lack of practical analysis tools to discover hidden relationships and trends in data. The complexity of medical data that is unfavorable for most models is a considerable challenge in prediction. The ability of a model to perform accurately and efficiently in disease diagnosis is extremely significant. Thus, the model must be selected to fit the data better, such that the learning from previous data is most efficient, and the diagnosis of the disease is highly accurate. This work is motivated by the limited number of regression analysis tools for multivariate counts in the literature. We propose two regression models for count data based on flexible distributions, namely, the multinomial Beta-Liouville and multinomial scaled Dirichlet, and evaluated the proposed models in the problem of disease diagnosis. The performance is evaluated based on the accuracy of the prediction which depends on the nature and complexity of the dataset. Our results show the efficiency of the two proposed regression models where the prediction performance of both models is competitive to other previously used regression models for count data and to the best results in the literature. 相似文献
2.
3.
4.
针对弹用发动机无故障数据可靠性评估问题,提出基于多源信息的可靠性评估方法;综合应用修正极大似然估计和Bayes估计方法,给出信息源权值的计算公式和可靠性评估步骤,最后给出应用实例.计算结果表明,多源信息融合方法计算简单,评估结果合理,具有一定工程应用价值. 相似文献
5.
In this paper are presented and discussed tabulations of the cumulative distribution functions of quasimidranges and mixtures of quasimidranges of samples from a normal distribution. The tabulations extend up to samples of size 21. For quasimidranges not involving the extreme values of the sample, the departure from normality is very small. The physical problem giving rise to the mixtures is discussed. 相似文献
6.
Zhibin Tan 《Reliability Engineering & System Safety》2009,94(2):394-403
We study the two-parameter maximum likelihood estimation (MLE) problem for the Weibull distribution with consideration of interval data. Without interval data, the problem can be solved easily by regular MLE methods because the restricted MLE of the scale parameter β for a given shape parameter α has an analytical form, thus α can be efficiently solved from its profile score function by traditional numerical methods. In the presence of interval data, however, the analytical form for the restricted MLE of β does not exist and directly applying regular MLE methods could be less efficient and effective. To improve efficiency and effectiveness in handling interval data in the MLE problem, a new approach is developed in this paper. The new approach combines the Weibull-to-exponential transformation technique and the equivalent failure and lifetime technique. The concept of equivalence is developed to estimate exponential failure rates from uncertain data including interval data. Since the definition of equivalent failures and lifetimes follows EM algorithms, convergence of failure rate estimation by applying equivalent failures and lifetimes is mathematically proved. The new approach is demonstrated and validated through two published examples, and its performance in different conditions is studied by Monte Carlo simulations. It indicates that the profile score function for α has only one maximum in most cases. Such good characteristic enables efficient search for the optimal value of α. 相似文献
7.
针对传统甲类功率放大器电路复杂、电路稳定性较差的缺点,设计开发了一种新的基于全对称互补差分放大电路的甲类功率放大器。该放大器采用MLE20/MJD20绝缘栅型场效应管作为电流放大管,通过对差分输入级、电压放大级、功率输出级中各元件参数的合理设计,降低了功率放大器的输出内阻,提高了电路的驱动能力及电路的稳定性。 相似文献
8.
混合高斯参数估计的两种EM算法比较 总被引:1,自引:0,他引:1
混合高斯模型是一种典型的非高斯概率密度模型,获得广泛应用。其参数的优效估计可以通过最大似然方法获得,但最大似然估计往往因其非线性而难以实现,故期望最大化(Expectation-Maximization,EM)迭代算法成为一种常用的替代方法。常规EM算法性能受迭代初值设置影响大,且不能对模型阶数做出估计。一种名为贪婪EM的改进算法可以克服这两个缺点,获得更为准确的模型参数估计,但其运算量一般会远大于前者。本文对这两种EM算法进行综合研究,深入挖掘两者之间的关系,并基于相同的数值仿真实例,直观地演示比较两者的性能差异。 相似文献
9.
10.
一种改进型免疫算法在TDOA定位中的应用 总被引:1,自引:0,他引:1
为解决传统TDOA定位估计所带来的非线性优化问题,首先通过最大似然估计将其转换为峰值搜索优化问题,再提出一种基于克隆选择思想的改进型免疫算法对其进行求解。该算法采用浮点数编码方式,提高了运算效率;引入高斯变异算子和变异控制变量,加强了局部搜索能力。仿真实验表明,在保证一定抗体数目的前提下,该算法适应性强,性能稳定,能快速逼近全局最优的解,且算法定位精度更高。 相似文献