In this paper, we propose Personalized Markov Embedding (PME), a next-song recommendation strategy for online karaoke users. By modeling the sequential singing behavior, we first embed songs and users into a Euclidean space in which distances between songs and users reflect the strength of their relationships. Then, given each user's last song, we can generate personalized recommendations by ranking the candidate songs according to the embedding. Moreover, PME can be trained without any requirement of content information. Finally, we perform an experimental evaluation on a real world data set provided by ihou.com which is an online karaoke website launched by iFLYTEK, and the results clearly demonstrate the effectiveness of PME.
Shape
reconfigurable devices, e.g., foldable phones, have emerged
with the development of flexible electronics. But their rigid frames
limit the feasible shapes for the devices. To achieve freely changeable
shapes yet keep the rigidity of devices for user-friendly operations,
stiffness-tunable materials are desired, especially under electrical
control. However, current such systems are multilayer with at least
a heater layer and a structural layer, leading to complex fabrication,
high cost, and loss of reprocessability. Herein, we fabricate covalent
adaptable networks–carbon nanotubes (CAN-CNT) composites to
realize Joule heating controlled stiffness. The nanocomposites function
as stiffness-tunable matrices, electric heaters, and softening sensors
all by themselves. The self-reporting of softening is used to regulate
the power control, and the sensing mechanism is investigated by simulating
the CNT–polymer chain interactions at the nanoscale during
the softening process. The nanocomposites not only have adjustable
mechanical and thermodynamic properties but also are easy to fabricate
at low cost and exhibit reprocessability and recyclability benefiting
from the dynamic exchange reactions of CANs. Shape and stiffness control
of flexible display systems are demonstrated with the nanocomposites
as framing material, where freely reconfigurable shapes are realized
to achieve convenient operation, wearing, or storage, fully exploiting
their flexible potential.
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