796 research outputs found
Zero-Shot Relation Extraction via Reading Comprehension
We show that relation extraction can be reduced to answering simple reading
comprehension questions, by associating one or more natural-language questions
with each relation slot. This reduction has several advantages: we can (1)
learn relation-extraction models by extending recent neural
reading-comprehension techniques, (2) build very large training sets for those
models by combining relation-specific crowd-sourced questions with distant
supervision, and even (3) do zero-shot learning by extracting new relation
types that are only specified at test-time, for which we have no labeled
training examples. Experiments on a Wikipedia slot-filling task demonstrate
that the approach can generalize to new questions for known relation types with
high accuracy, and that zero-shot generalization to unseen relation types is
possible, at lower accuracy levels, setting the bar for future work on this
task.Comment: CoNLL 201
TriviaQA: A Large Scale Distantly Supervised Challenge Dataset for Reading Comprehension
We present TriviaQA, a challenging reading comprehension dataset containing
over 650K question-answer-evidence triples. TriviaQA includes 95K
question-answer pairs authored by trivia enthusiasts and independently gathered
evidence documents, six per question on average, that provide high quality
distant supervision for answering the questions. We show that, in comparison to
other recently introduced large-scale datasets, TriviaQA (1) has relatively
complex, compositional questions, (2) has considerable syntactic and lexical
variability between questions and corresponding answer-evidence sentences, and
(3) requires more cross sentence reasoning to find answers. We also present two
baseline algorithms: a feature-based classifier and a state-of-the-art neural
network, that performs well on SQuAD reading comprehension. Neither approach
comes close to human performance (23% and 40% vs. 80%), suggesting that
TriviaQA is a challenging testbed that is worth significant future study. Data
and code available at -- http://nlp.cs.washington.edu/triviaqa/Comment: Added references, fixed typos, minor baseline updat
QuAC : Question Answering in Context
We present QuAC, a dataset for Question Answering in Context that contains
14K information-seeking QA dialogs (100K questions in total). The dialogs
involve two crowd workers: (1) a student who poses a sequence of freeform
questions to learn as much as possible about a hidden Wikipedia text, and (2) a
teacher who answers the questions by providing short excerpts from the text.
QuAC introduces challenges not found in existing machine comprehension
datasets: its questions are often more open-ended, unanswerable, or only
meaningful within the dialog context, as we show in a detailed qualitative
evaluation. We also report results for a number of reference models, including
a recently state-of-the-art reading comprehension architecture extended to
model dialog context. Our best model underperforms humans by 20 F1, suggesting
that there is significant room for future work on this data. Dataset, baseline,
and leaderboard available at http://quac.ai.Comment: EMNLP Camera Read
Load Deformation Test of Metal Brackets : A Comparative Study
The purpose of this study was to determine the effect material and design (slot torque degree and wing type) had on the force and stress to permanently deform metal brackets.
Fourteen different types of metal brackets were tested and categorized into three categories. The three categories were: raw material composition, slot torque degree, and wing type. There were 5 types of raw materials (310SS, 316L, 303SE, 3038, and 17-4PH), 3 types of slot torque degree (0 degree, 7 degree, and 12 degree), and 4 types of wing design (mini twin, single, regular twin, and modified twin). All brackets were tested using arch wire torque test developed by Flores.
An analysis of variance (ANOVA) and Student\u27s t-test showed that raw material, wing type, and slot torque degree had a significant effect on the force and stress to permanently deform metal brackets. Of the three variables, raw material had the greatest effect on the force to permanently deform metal brackets.
Results showed that 17-4PH and 303S had higher yield strengths and regular twin had higher resistance to deformation. Also, as slot torque degree increased, brackets deformed with less force.
A positive correlation between the micro hardness and the stress to deform metal brackets confirmed that brackets with the greatest stress to permanently deform were made of steels with the greatest hardness
B-Physics Phenomenology with Emphasis on the Light-Cone
Theoretical overviews on the B-physics are presented with an emphasis on the
light-cone degrees of freedom. Our new treatment of the embedded states seems
to give an encouraging result.Comment: 10 pages including 2 figures, elsart.sty; invited talk presented at
the Tenth International Light-Cone Meeting on Non-Perturbative QCD and Hadron
Phenomenology, Heidelberg, June 12-17, 200
Electronic modulation of infrared emissivity in graphene plasmonic resonators
Electronic control of blackbody emission from graphene plasmonic resonators
on a silicon nitride substrate is demonstrated at temperatures up to 250 C. It
is shown that the graphene resonators produce antenna-coupled blackbody
radiation, manifest as narrow spectral emission peaks in the mid-IR. By
continuously varying the nanoresonators carrier density, the frequency and
intensity of these spectral features can be modulated via an electrostatic
gate. We describe these phenomena as plasmonically enhanced radiative emission
originating both from loss channels associated with plasmon decay in the
graphene sheet and from vibrational modes in the SiNx.Comment: 17 pages, 6 figure
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