排序方式: 共有6条查询结果,搜索用时 25 毫秒
1
1.
2.
3.
R. Östermark 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2002,6(1):45-63
The paper proposes a new multiple-representation geno-mathematical algorithm for coping with ill-conditioned time series
processes through competing nonlinear model formulations. Extensive testing and comparisons to a rigorous statistical time
series package indicate that the geno-mathematical search-machine is effective and robust for modelling complicated time series.
The new algorithm is used to model a representative set of global asset returns. The diagnostic tests prove that the ARCH-effects
of the difficult nonlinear processes are annihilated completely in both full and reduced model variants. 相似文献
4.
R. Östermark 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》1999,3(4):206-220
The paper proposes a new neuro-genetic hybrid algorithm (NGHA) for coping with ill-conditioned time-series processes. Extensive
testing and comparisons to various heteroskedastic models indicate that the neuro-genetic algorithm may be a useful device
for modelling complicated time series. NGHA is used to model a factor price series corresponding to the European factor of
a representative set of global asset returns. NGHA provides a platform for adapting evolutionary computation to the search
for suitable networks for observed time series. 相似文献
5.
6.
Julius Parulek Daniel Jönsson Timo Ropinski Stefan Bruckner Anders Ynnerman Ivan Viola 《Computer Graphics Forum》2014,33(6):276-287
Molecular visualization is often challenged with rendering of large molecular structures in real time. We introduce a novel approach that enables us to show even large protein complexes. Our method is based on the level‐of‐detail concept, where we exploit three different abstractions combined in one visualization. Firstly, molecular surface abstraction exploits three different surfaces, solvent‐excluded surface (SES), Gaussian kernels and van der Waals spheres, combined as one surface by linear interpolation. Secondly, we introduce three shading abstraction levels and a method for creating seamless transitions between these representations. The SES representation with full shading and added contours stands in focus while on the other side a sphere representation of a cluster of atoms with constant shading and without contours provide the context. Thirdly, we propose a hierarchical abstraction based on a set of clusters formed on molecular atoms. All three abstraction models are driven by one importance function classifying the scene into the near‐, mid‐ and far‐field. Moreover, we introduce a methodology to render the entire molecule directly using the A‐buffer technique, which further improves the performance. The rendering performance is evaluated on series of molecules of varying atom counts. 相似文献
1