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31.
对工程图进行矢量化,提取有用信息,用于工程设计,可以大大提高设计效率.在图像矢量化的方法中,基于细化的算法容易丢失一些有用信息,造成数据畸变,影响矢量化结果.因此,在矢量化过程中,沿图像边缘进行轮廓匹配时,同时求出拟合段图线的曲率和法向量,充分利用其特性,从而兼顾线宽和线型,为图像矢量化提供了一个实用的方法. 相似文献
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34.
We present a deposition and evaporation model for surface growth under a solid-on-solid constraint. We generalize the Ising-spin representation of a two-dimensional surface by Blöte and Hilhorst to ad-dimensional surface of a (d+1)-dimensional hypercubic lattice. The allowed surface configurations correspond to the (degenerate) ground states of a chirald-state Potts model. We describe a vectorized multisite-coding implementation for the corresponding kinetic Potts-spin model ford=2 andd=3. For thed=2 equilibrium surface our simulation results show excellent agreement with an exact analysis. 相似文献
35.
Craig C. Douglas 《Advances in Computational Mathematics》1994,2(2):215-222
A common statement in papers in the vectorization field is to note that point SOR methods with the natural ordering cannot
be vectorized. The usual approach is to reorder the unknowns using a red-black or diagonal ordering and vectorize that. In
this paper we construct a point Gauss-Seidel iteration which completely vectorizes and still uses the natural ordering. The
work here also applies to both point SOR and single program, multiple data (SPMD) parallel computer architectures. When this
approach is reasonable to use is also shown. 相似文献
36.
O. Paetzold 《Journal of statistical physics》1990,61(1-2):495-500
We examined the diffusion of lattice gases, where double occupancy of sites is excluded, on three-dimensional percolation lattices at the percolation thresholdp
c
. The critical exponent for the root-mean-square displacement was determined to bek=0.183±0.010, which is similiar to the result of Roman for the problem of the ant in the labyrinth. Furthermore, we found a plateau value fork at intermediate times for systems with higher concentrations of lattice gas particles. 相似文献
37.
研究了一种在细化线的基础上的工程图纸并行矢量化方法.它的原理是根据曙光1000A并行机的特点,通过并行检测图形向前和向后的光栅来度量直线长度检测线记号,然后通过拟合线记号得出一组组合线,再将这些近似的线段合并为矢量数据来描述原始的图像. 相似文献
38.
With the development of Internet technology, short texts have gradually become the main medium for people to obtain information and communicate. Short text reduces the threshold of information production and reading by virtue of its short length, which is in line with the trend of fragmented reading in the context of the current fast-paced life. In addition, short texts contain emojis to make the communication immersive. However, short-text content means it contains relatively little information, which is not conducive to the analysis of sentiment characteristics. Therefore, this paper proposes a sentiment classification method based on the blending of emoticons and short-text content. Emoticons and short-text content are transformed into vectors, and the corresponding word vector and emoticon vector are connected into a sentencing matrix in turn. The sentence matrix is input into a convolution neural network classification model for classification. The results indicate that, compared with existing methods, the proposed method improves the accuracy of analysis. 相似文献
39.
整体识别方法是工程图纸扫描转换领域中一种值得研究的矢量化方法,本文给出了整体识别方法中基于图段的数据结构,分析了一个基于整体识别方法的图纸转换系统-EDrus系统的组成,并介绍限几个主要的矢量转换算法,本文最后给出了一个实例,用以说明系统的有效性。 相似文献
40.
Ananta Tiwari Allyson Cauble‐Chantrenne Adam Jundt Joshua Peraza Rainald Löhner Joseph D. Baum Laura Carrington 《国际流体数值方法杂志》2018,86(11):699-716
Intel's latest Xeon Phi processor, Knights Landing (KNL), has the potential to provide over 2.6 TFLOPS. However, to obtain maximum performance on the KNL, significant refactoring and optimization of application codes are still required to exploit key architectural innovations that KNL features—wide vector units, many‐core node design, and deep memory hierarchy. The experience and insights gained in porting and running FEFLO (a typical edge‐based finite element code for the solution of compressible and incompressible flows) on the KNL platform are described in this paper. In particular, optimizations used to extract on‐node parallelism via vectorization and multithreading and improve internode communication are considered. These optimizations resulted in a 2.3× performance gain on a 16 node runs of FEFLO, with the potential for larger performance gains as the code is scaled beyond 16 nodes. The impact of the different configurations of KNL's on‐package MCDRAM (Multi‐Channel DRAM) memory on FEFLO's performance is also explored. Finally, the performance of the optimized versions of FEFLO for KNL and Haswell (Intel Xeon) is compared. 相似文献