15,596 research outputs found
I\u27ll Be Your Friend
In this piece, Min-Jung Kim chronicles her struggles as a young Korean-American girl trying to pursue her American Dream to be the first-generation college student in her family
Flashlight
This poem illustrates the struggle of an undergraduate first-generation college student who knew little about the first-gen identity or the experiences she would encounter until she became a First To Go Scholar at Loyola Marymount University. The poet represents the First To Go Program as a flashlight that has helped her to navigate a once dark and unfamiliar environment
Highly efficient source for frequency-entangled photon pairs generated in a 3rd order periodically poled MgO-doped stoichiometric LiTaO3 crystal
We present a highly efficient source for discrete frequency-entangled photon
pairs based on spontaneous parametric down-conversion using 3rd order type-0
quasi-phase matching in a periodically poled MgO-doped stoichiometric LiTaO3
crystal pumped by a 355.66 nm laser. Correlated two-photon states were
generated with automatic conservation of energy and momentum in two given
spatial modes. These states have a wide spectral range, even under small
variations in crystal temperature, which consequently results in higher
discreteness. Frequency entanglement was confirmed by measuring two-photon
quantum interference fringes without any spectral filtering.Comment: 4 pages, 4 figures, to be published in Optics Letter
Click-aware purchase prediction with push at the top
Eliciting user preferences from purchase records for performing purchase
prediction is challenging because negative feedback is not explicitly observed,
and because treating all non-purchased items equally as negative feedback is
unrealistic. Therefore, in this study, we present a framework that leverages
the past click records of users to compensate for the missing user-item
interactions of purchase records, i.e., non-purchased items. We begin by
formulating various model assumptions, each one assuming a different order of
user preferences among purchased, clicked-but-not-purchased, and non-clicked
items, to study the usefulness of leveraging click records. We implement the
model assumptions using the Bayesian personalized ranking model, which
maximizes the area under the curve for bipartite ranking. However, we argue
that using click records for bipartite ranking needs a meticulously designed
model because of the relative unreliableness of click records compared with
that of purchase records. Therefore, we ultimately propose a novel
learning-to-rank method, called P3Stop, for performing purchase prediction. The
proposed model is customized to be robust to relatively unreliable click
records by particularly focusing on the accuracy of top-ranked items.
Experimental results on two real-world e-commerce datasets demonstrate that
P3STop considerably outperforms the state-of-the-art implicit-feedback-based
recommendation methods, especially for top-ranked items.Comment: For the final published journal version, see
https://doi.org/10.1016/j.ins.2020.02.06
- …