5 research outputs found
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Composing tree graphical models with persistent homology features for clustering mixed-type data
Clustering data with both continuous and discrete attributes is a challenging task. Existing methods often lack a principled probabilistic formulation. In this paper, we propose a clustering method based on a tree-structured graphical model to describe the generation process of mixed-type data. Our tree-structured model factorizes into a product of pairwise interactions, and thus localizes the interaction between feature variables of different types. To provide a robust clustering method based on the tree-model, we adopt a topographical view and compute peaks of the density function and their attractive basins for clustering. Furthermore, we leverage the theory from topology data analysis to adaptively merge trivial peaks into large ones in order to achieve meaningful clusterings. Our method outperforms state-of-the-art methods on mixed-type data
Investigation of the Solar Hydrogen Sensitivity of GeSe Thin Film Photoelectrode with Photoelectrochemical Environment
GeSe photovoltaic thin films are very promising for photoelectrochemical
(PEC) hydrogen evolution. The GeSe-based PEC water splitting device
is a system containing a photoelectrode, electrolyte, and other packages,
and the performance of the GeSe photoelectrode inside the system is
very sensitive to the PEC system environment, such as the electrolyte
temperature, pH, and concentration. Here, we reveal how the electrolyte
environment at the electrolyte/photoelectrode interface influences
the optoelectronic/PEC properties of GeSe photoelectrodes. It was
found that the photocurrent density of the GeSe photoelectrode increased
with temperature between 10 and 50 °C but decreased when the
temperature was over 50 °C. In addition, the pH values of the
electrolyte were inversely proportional to the photocurrent density
of the GeSe photoelectrode. Moreover, the PEC performance improved
as the sodium ion concentration of the electrolyte increased. The
results in this work should provide a new direction for further optimizing
the performance of photoelectrodes