7,332 research outputs found
Dynamics of Dry Friction: A Numerical Investigation
We perform extended numerical simulation of the dynamics of dry friction,
based on a model derived from the phenomenological description proposed by T.
Baumberger et al.. In the case of small deviation from the steady sliding
motion, the model is shown to be equivalent to the state- and rate-dependent
friction law which was first introduced by Rice and Ruina on the basis of
experiments on rocks. We obtain the dynamical phase diagram that agrees well
with the experimental results on the paper-on-paper systems. In particular, the
bifurcation between stick-slip and steady sliding are shown to change from a
direct (supercritical) Hopf type to an inverted (subcritical) one as the
driving velocity increases, in agreement with the experiments.Comment: 7 pages, 5 figures, using RevTe
AMC: Attention guided Multi-modal Correlation Learning for Image Search
Given a user's query, traditional image search systems rank images according
to its relevance to a single modality (e.g., image content or surrounding
text). Nowadays, an increasing number of images on the Internet are available
with associated meta data in rich modalities (e.g., titles, keywords, tags,
etc.), which can be exploited for better similarity measure with queries. In
this paper, we leverage visual and textual modalities for image search by
learning their correlation with input query. According to the intent of query,
attention mechanism can be introduced to adaptively balance the importance of
different modalities. We propose a novel Attention guided Multi-modal
Correlation (AMC) learning method which consists of a jointly learned hierarchy
of intra and inter-attention networks. Conditioned on query's intent,
intra-attention networks (i.e., visual intra-attention network and language
intra-attention network) attend on informative parts within each modality; a
multi-modal inter-attention network promotes the importance of the most
query-relevant modalities. In experiments, we evaluate AMC models on the search
logs from two real world image search engines and show a significant boost on
the ranking of user-clicked images in search results. Additionally, we extend
AMC models to caption ranking task on COCO dataset and achieve competitive
results compared with recent state-of-the-arts.Comment: CVPR 201
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