Search Results for author: Yu Qiu

Found 26 papers, 4 papers with code

Boosting Salient Object Detection with Transformer-based Asymmetric Bilateral U-Net

no code implementations17 Aug 2021 Yu Qiu, Yun Liu, Le Zhang, Jing Xu

The asymmetric bilateral encoder has a transformer path and a lightweight CNN path, where the two paths communicate at each encoder stage to learn complementary global contexts and local spatial details, respectively.

Object Detection Salient Object Detection

Primary-Auxiliary Model Scheduling Based Estimation of the Vertical Wheel Force in a Full Vehicle System

no code implementations24 Jul 2021 Xueke Zheng, Runze Cai, Shuixin Xiao, Yu Qiu, Jun Zhang, Mian Li

A real-world application to the estimation of the vertical wheel force in a full vehicle system are, respectively, conducted to demonstrate the effectiveness of the proposed method.

Transformer in Convolutional Neural Networks

1 code implementation6 Jun 2021 Yun Liu, Guolei Sun, Yu Qiu, Le Zhang, Ajad Chhatkuli, Luc van Gool

We tackle the low-efficiency flaw of vision transformer caused by the high computational/space complexity in Multi-Head Self-Attention (MHSA).

On the Mass Loading of AGN-Driven Outflows in Elliptical Galaxies and Clusters

no code implementations11 Mar 2021 Yu Qiu, Brian R. McNamara, Tamara Bogdanovic, Kohei Inayoshi, Luis C. Ho

In this work, we use a single parameter, outflow-to-accretion mass-loading factor $m=\dot{M}_{\rm out}/\dot{M}_{\rm BH}$, to characterize the outflows that mediate the interaction between SMBHs and their hosts.

Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena

Leveraging Instance-, Image- and Dataset-Level Information for Weakly Supervised Instance Segmentation

1 code implementation10 Sep 2020 Yun Liu, Yu-Huan Wu, Pei-Song Wen, Yu-Jun Shi, Yu Qiu, Ming-Ming Cheng

For each proposal, this MIL framework can simultaneously compute probability distributions and category-aware semantic features, with which we can formulate a large undirected graph.

Instance Segmentation Multiple Instance Learning +2

MiniSeg: An Extremely Minimum Network for Efficient COVID-19 Segmentation

1 code implementation21 Apr 2020 Yu Qiu, Yun Liu, Shijie Li, Jing Xu

On the other hand, fast training/testing and low computational cost are also necessary for quick deployment and development of COVID-19 screening systems, but traditional deep learning methods are usually computationally intensive.

COVID-19 Diagnosis Semantic Segmentation

Contractibility of space of stability conditions on the projective plane via global dimension function

1 code implementation31 Jan 2020 Yu-Wei Fan, Chunyi Li, Wanmin Liu, Yu Qiu

We compute the global dimension function $\mathrm{gldim}$ on the principal component $\mathrm{Stab}^{\dag}(\mathbb{P}^2)$ of the space of Bridgeland stability conditions on $\mathbb{P}^2$.

Algebraic Geometry General Topology Representation Theory 2020: 14F08 (18G80, 32Q55)

Salient Object Detection via High-to-Low Hierarchical Context Aggregation

no code implementations28 Dec 2018 Yun Liu, Yu Qiu, Le Zhang, Jia-Wang Bian, Guang-Yu Nie, Ming-Ming Cheng

In this paper, we observe that the contexts of a natural image can be well expressed by a high-to-low self-learning of side-output convolutional features.

RGB Salient Object Detection Saliency Prediction +1

Decorated Marked Surfaces: Calabi-Yau categories and related topics

no code implementations30 Nov 2018 Yu Qiu

This is a survey on the project `Decorated Marked Surfaces', where we introduce the decoration $\Delta$ on a marked surfaces $\mathbf{S}$, to study Calabi-Yau-2 (cluster) categories, Calabi-Yau-3 (Fukaya) categories, braid groups for quivers with potential, quadratic differentials and stability conditions.

Representation Theory Category Theory Geometric Topology

$q$-Stability conditions via $q$-quadratic differentials for Calabi-Yau-$\mathbb{X}$ categories

no code implementations30 Nov 2018 Akishi Ikeda, Yu Qiu

Geometrically, we identify the space of $q$-quadratic differentials on the logarithm surface $\log\mathbf{S}_\Delta$, with the space of induced $q$-stability conditions on $\mathcal{D}_{\mathbb{X}}(\mathbf{T})$, with a complex parameter $s$ satisfying $\operatorname{Re}(s)\gg1$.

Algebraic Geometry Dynamical Systems Representation Theory

$q$-Stability conditions on Calabi-Yau-$\mathbb{X}$ categories

no code implementations2 Jul 2018 Akishi Ikeda, Yu Qiu

We introduce $q$-stability conditions $(\sigma, s)$ on Calabi-Yau-$\mathbb{X}$ categories $\mathcal{D}_\mathbb{X}$, where $\sigma$ is a stability condition on $\mathcal{D}_\mathbb{X}$ and $s$ a complex number.

Algebraic Geometry Category Theory Representation Theory

Global dimension function, Gepner equations and $q$-stability conditions

no code implementations29 Jun 2018 Yu Qiu

Here $\operatorname{QStab}_s\mathcal{D}_\mathbb{X}(Q)$ is defined by another Gepner equation $\mathbb{X}(\sigma)=s\cdot\sigma$ and $\tau_\mathbb{X}^\mathcal{L}=[\mathbb{X}-2]\circ \zeta_Q^\mathcal{L}$, where $\zeta_Q^\mathcal{L}$ is a root of the generator of the center of the spherical twist group $\operatorname{ST}_\mathbb{X}(Q)$.

Representation Theory Algebraic Geometry

Topological structure of spaces of stability conditions and topological Fukaya type categories

no code implementations31 May 2018 Yu Qiu

First, we review the study of topological structure of `finite type' components of spaces of Bridgeland's stability conditions on triangulated categories.

Representation Theory Algebraic Geometry Geometric Topology

Cluster exchange groupoids and framed quadratic differentials

no code implementations30 Apr 2018 Alastair King, Yu Qiu

In the case that arises from an (unpunctured) marked surface, where the exchange graph is modelled on the graph of triangulations of the marked surface, we show that the universal cover of this groupoid can be constructed using the covering graph of triangulations of the surface with extra decorations.

Geometric Topology Algebraic Geometry Dynamical Systems Representation Theory

Decorated marked surfaces III: The derived category of a decorated marked surface

no code implementations31 Mar 2018 Aslak Bakke Buan, Yu Qiu, Yu Zhou

As an application, we show that the spherical twist group $\operatorname{ST}(\mathbf{S}_\bigtriangleup)$ associated to $\mathcal{D}_{fd}(\mathbf{S}_\bigtriangleup)$ acts faithfully on its space of stability conditions.

Representation Theory Rings and Algebras

The braid group for a quiver with superpotential

no code implementations27 Dec 2017 Yu Qiu

We survey and compare various generalizations of braid groups for quivers with superpotential and focus on the cluster braid groups, which are introduced in a joint work with A.~King.

Representation Theory

Decorated marked surfaces II: Intersection numbers and dimensions of Homs

no code implementations14 Nov 2014 Yu Qiu, Yu Zhou

We study the 3-Calabi-Yau categories $\mathcal{D}$ arising from quivers with potential associated to a decorated marked surface $\mathbf{S}_\bigtriangleup$ introduced by the first author.

Representation Theory Category Theory Geometric Topology

Contractible stability spaces and faithful braid group actions

no code implementations22 Jul 2014 Yu Qiu, Jon Woolf

We prove that any `finite-type' component of a stability space of a triangulated category is contractible.

Algebraic Geometry Representation Theory 18E30 (Primary) 14F05, 16J99 (Secondary)

Stability conditions and the $A_2$ quiver

no code implementations10 Jun 2014 Tom Bridgeland, Yu Qiu, Tom Sutherland

We compute the space of stability conditions on the CY$_n$ version of the $A_2$ quiver for all $n$ and relate it to the Frobenius-Saito structure on the unfolding space of the $A_2$ singularity.

Algebraic Geometry Differential Geometry Representation Theory

Cluster categories for marked surfaces: punctured case

no code implementations31 Oct 2013 Yu Qiu, Yu Zhou

We study the cluster categories arising from marked surfaces (with punctures and non-empty boundaries).

Representation Theory Geometric Topology 16G20, 18E30, 16E30, 57M50 (primary), 16G70 (secondary)

Tagged mapping class groups: Auslander-Reiten translation

no code implementations30 Nov 2012 Thomas Brüstle, Yu Qiu

We give a geometric realization, the tagged rotation, of the AR-translation on the generalized cluster category associated to a surface $\mathbf{S}$ with marked points and non-empty boundary, which generalizes Br\"{u}stle-Zhang's result for the puncture free case.

Representation Theory Geometric Topology

Frobenius morphisms and stability conditions

no code implementations30 Sep 2012 Wen Chang, Yu Qiu

the principal component $\operatorname{Stab}^\circ\mathcal{D}(\Gamma\mathbb{S})$) of the space of the stability conditions of $\mathcal{D}(\mathbb{S})$ (resp.

Representation Theory

C-sortable words as green mutation sequences

no code implementations30 Apr 2012 Yu Qiu

We describe an induced sequence of simple (backward) tilting in the bounded derived category $\mathcal{D}(Q)$, starting from the standard heart $\mathcal{H}_Q=\operatorname{mod}\mathbf{k}Q$ and ending at another heart $\mathcal{H}_\mathbf{s}$ in $\mathcal{D}(Q)$.

Combinatorics Representation Theory

Ext-quivers of hearts of A-type and the orientation of associahedron

no code implementations28 Feb 2012 Yu Qiu

We classify the Ext-quivers of hearts in the bounded derived category D(A_n) and the finite-dimensional derived category D(\Gamma_N A_n) of the Calabi-Yau-N Ginzburg algebra D(\Gamma_N A_n).

Representation Theory Combinatorics

Stability conditions and quantum dilogarithm identities for Dynkin quivers

no code implementations3 Nov 2011 Yu Qiu

We study fundamental group of the exchange graphs for the bounded derived category D(Q) of a Dynkin quiver Q and the finite-dimensional derived category D(\Gamma_N Q) of the Calabi-Yau-N Ginzburg algebra associated to Q.

Algebraic Geometry Representation Theory

Exchange graphs and Ext quivers

no code implementations13 Sep 2011 Alastair King, Yu Qiu

We study the oriented exchange graph $\textrm{EG}^\circ(\Gamma_{N}\, Q)$ of reachable hearts in the finite-dimensional derived category $\mathcal{D}(\Gamma_{N}\, Q)$ of the CY-$N$ Ginzburg algebra $\Gamma_{N}Q$ associated to an acyclic quiver $Q$.

Representation Theory

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