全文获取类型
收费全文 | 464篇 |
免费 | 5篇 |
国内免费 | 16篇 |
专业分类
化学 | 64篇 |
力学 | 5篇 |
数学 | 161篇 |
物理学 | 136篇 |
综合类 | 119篇 |
出版年
2024年 | 2篇 |
2023年 | 1篇 |
2022年 | 13篇 |
2021年 | 12篇 |
2020年 | 8篇 |
2019年 | 8篇 |
2018年 | 11篇 |
2017年 | 17篇 |
2016年 | 14篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 40篇 |
2012年 | 30篇 |
2011年 | 33篇 |
2010年 | 34篇 |
2009年 | 32篇 |
2008年 | 37篇 |
2007年 | 37篇 |
2006年 | 16篇 |
2005年 | 12篇 |
2004年 | 12篇 |
2003年 | 12篇 |
2002年 | 6篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有485条查询结果,搜索用时 10 毫秒
51.
Eiichiro Takahagi 《Fuzzy Optimization and Decision Making》2008,7(3):219-232
We propose an identification method of fuzzy measures by diamond pairwise comparisons. Right and left side of the diamond
means ordinal weights’ comparison and up and down means interaction degrees. From the comparisons, we estimate a hierarchy
diagram with interaction degrees and weights of evaluation items using the agglomerative hierarchical clustering method. From
the diagram, to identify the fuzzy measure, conversion method is proposed. 相似文献
52.
针对军用飞机再次出动保障任务规划方案的效率分析缺乏有效的解决方法的问题,构建了基于灰色聚类算法与熵权法相结合的任务保障规划方案效率分析模型。该模型首先利用灰色聚类对保障方案的人员利用率的有效参数进行计算并确定。其后利用熵权法对保障方案的人员数量时间分布进行计算。在此基础上根据任务规划工期、人员利用率、人员数量时间分布三个参数的权重得到任务保障规划方案效率。文中通过实例对构建的效率分析模型进行了验证。结果表明:所构建的效率分析模型能够有效的对军用飞机任务保障规划方案效率分析,且具有较高的可靠性和很好的工程应用价值。 相似文献
53.
Minghui Jiang 《Discrete Applied Mathematics》2007,155(17):2355-2361
Given a set S of n points in R3, we wish to decide whether S has a subset of size at least k with Euclidean diameter at most r. It is unknown whether this decision problem is NP-hard. The two closely related optimization problems, (i) finding a largest subset of diameter at most r, and (ii) finding a subset of the smallest diameter of size at least k, were recently considered by Afshani and Chan. For maximizing the size, they presented several polynomial-time algorithms with constant approximation factors, the best of which has a factor of . For maximizing the diameter, they presented a polynomial-time approximation scheme. In this paper, we present improved approximation algorithms for both optimization problems. For maximizing the size, we present two algorithms: the first one improves the approximation factor to 2.5 and the running time by an O(n) factor; the second one improves the approximation factor to 2 and the running time by an O(n2) factor. For minimizing the diameter, we improve the running time of the PTAS from O(nlogn+2O(1/ε3)n) to O(nlogn+2O(1/(ε1.5logε))n). 相似文献
54.
55.
日益增长的环境压力对复杂产品供应链碳足迹优化提出了更高的要求。为了降低优化过程动态性及不确定性,在综合评述产品拆卸建模分析研究方法的基础上,依据约束关系和装配结构,通过构建规则,设计多目标复杂产品碳足迹结构元拆卸混合图模型,确立模型约束关系矩阵,利用迭代分层思想设计驱动式递归聚类搜索算法,规划各层次碳足迹结构元模块。经液晶显示器实例证明,该规划方法可有效剖析复杂产品碳足迹结构基本元及模块单元。 相似文献
56.
Nowadays, community detection has been raised as one of the key research areas in the online social networks mining. One of the most common algorithms in this field is label propagation algorithm (LPA). Even though the LPA method has advantages such as simplicity in understanding and implementation, as well as linear time complexity, it has an important disadvantage of the uncertainty and instability in outcomes, that is, the algorithm detects and reports different combinations of communities in each run. This problem originates from the nature of random selection in the LPA method. In this paper, a novel method is proposed based on the LPA method and the inherent structure, that is, link density feature, of the input network. The proposed method uses a sensitivity parameter (balance parameter); by choosing the appropriate values for it, the desired qualities of the identified communities can be achieved. The proposed method is called Balanced Link Density-based Label Propagation (BLDLP). In comparison with the basic LPA, the proposed method has an advantage of certainty and stability in the output results, whereas its time complexity is still comparable with the basic LPA and of course lowers than many other approaches. The proposed method has been evaluated on real-world known datasets, such as the Facebook social network and American football clubs, and by comparing it with the basic LPA, the effectiveness of the proposed method in terms of the quality of the communities found and the time complexity has been shown. 相似文献
57.
This paper introduces an unsupervised method for the classification of discrete rovers’ slip events based on proprioceptive signals. In particular, the method is able to automatically discover and track various degrees of slip (i.e. low slip, moderate slip, high slip). The proposed method is based on aggregating the data over time, since high level concepts, such as high and low slip, are concepts that are dependent on longer time perspectives. Different features and subsets of the data have been identified leading to a proper clustering, interpreting those clusters as initial models of the prospective concepts. Bayesian tracking has been used in order to continuously improve the parameters of these models, based on the new data. Two real datasets are used to validate the proposed approach in comparison to other known unsupervised and supervised machine learning methods. The first dataset is collected by a single-wheel testbed available at MIT. The second dataset was collected by means of a planetary exploration rover in real off-road conditions. Experiments prove that the proposed method is more accurate (up to 86% of accuracy vs. 80% for K-means) in discovering various levels of slip while being fully unsupervised (no need for hand-labeled data for training). 相似文献
58.
Integration of knowledge on the sequence-structure correlation of proteins provides a basis for the structural design of artificial
novel proteins. As one of strategies, it is effective to consider a short segment, whose size is in between an amino acid
and a domain, as a correlation unit for exploring the structure-to-sequence relationship. Here we report the development of
a database called ProSeg, which consists of two sub-databases, Segment DB and Cluster DB. Segment DB contains tens of thousands of segments that were
prepared by dividing the primary sequences of 370 proteins using a sliding L-residue window (L = 5, 9, 11, 15). These segments were classified into several thousands of clusters according to their three-dimensional structural
resemblance. Cluster DB contains much cluster-related information, which includes image, rank, frequency, secondary structure
assignment, sequence profile, etc. Users can search for a suitable cluster by inputting an appropriate parameter (i.e., PDB
ID, dihedral angles, or DSSP symbols), which identifies the backbone structure of a query segment. Analogous to a language,
ProSeg could be regarded as a ‘structure-sequence dictionary’ that contains over 10,000 ‘protein words’. ProSeg is freely accessible through the Internet (). 相似文献
59.
聚类分析在入侵检测中的应用 总被引:1,自引:0,他引:1
孙珊珊 《河北省科学院学报》2010,27(3):31-34
在对现有的入侵检测技术研究的基础上,着重对数据挖掘技术中的聚类分析方法在入侵检测领域中的应用进行了研究。通过分析网络中数据的特点,提出了一种基于改进的k-means算法的无监督二次聚类算法,并用入侵检测权威数据集KDD Cup1999作为实验数据将其实现,实验表明,该算法具有较高的检测率和较低的误检率。 相似文献
60.