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- 저자 : Ivannikova, Elena (검색결과 2 건)
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Revealing community structures by ensemble clustering using group diffusion
Ivannikova, Elena,Park, Hyunwoo,Hä,mä,lä,inen, Timo,Lee, Kichun Elsevier 2018 Information fusion Vol.42 No.-
<P><B>Abstract</B></P> <P>We propose an ensemble clustering approach using group diffusion to reveal community structures in data. We represent data points as a directed graph and assume each data point belong to single cluster membership instead of multiple memberships. The method is based on the concept of ensemble group diffusion with a parameter to represent diffusion depth in clustering. The ability to modulate the diffusion-depth parameter by varying it within a certain interval allows for more accurate construction of clusters. Depending on the value of the diffusion-depth parameter, the presented approach can determine very well both local clusters and global structure of data. At the same time, the ability to combine single outcomes of the method results in better cluster segmentation. Due to this property, the proposed method performs well on data sets where other conventional clustering methods fail. We test the method with both simulated and real-world data sets. The results support our theoretical conjectures on improved accuracy compared to other selected methods.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Robust clustering results by integrating views from individual diffusion scales. </LI> <LI> Regulating cluster sizes by an admitted group dependence level. </LI> <LI> Handling directed graphs. </LI> <LI> Flexibility in the tuning of the parameters. </LI> <LI> Adaptation to datasets with various underlying structure and density properties. </LI> </UL> </P>
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Shlegel, V.N.,Shubin, Yu.V.,Ivannikova, N.V. The Korea Association of Crystal Growth 2003 韓國結晶成長學會誌 Vol.13 No.1
In the present work we consider morphological structure of the faces of BGO crystals grown by Czochralski technique under the conditions of low temperature gradient (0.1~1 deg/cm) and interconnection between the morphological features of faces at the crystallization front and the formation of defects within the crystal volume. It is demonstrated that the {112} faces retain stability while the growing surface deviates from the crystallographic (112) plane up to 1 degree. At larger deviation, the region of the stable facet growth passes either to the region of macrosteps or to the region of normal growth. depending on conditions.
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