Lei Zhang

Publications : 145
Aldex : 100
H-index : 11
Citations : 676


Prognostic predictors for outcome after childhood stroke

Zhou Fei, Lei Zhang et 2 al.

Feb 1, 2010 in The Lancet Neurology

Study of the Semileptonic Decay $Λ c^ plus \rightarrow Λ e^ plus ν e$

M. Ablikim, J. H. Zou et 572 al.

Jul 28, 2022 in Arxiv
The measurement of the Cabibbo-favored semileptonic decay $\Lambda_c^+\rightarrow \Lambda e^+\nu_e$ is reported using a $4.5~\mathrm{fb}^{-1}$ data sample of $e^+e^-$ annihilations collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be $\mathcal{B}(\Lambda_c^+\rightarrow \Lambda...

Auto Machine Learning for Medical Image Analysis by Unifying the Search on Data Augmentation and Neural Architecture

Jianwei Zhang, Lei Zhang et 3 al.

Jul 21, 2022 in Arxiv
Automated data augmentation, which aims at engineering augmentation policy automatically, recently draw a growing research interest. Many previous auto-augmentation methods utilized a Density Matching strategy by evaluating policies in terms of the test-time augmentation performance. In this paper, we theoretically and empirically demonstrated the inconsistency between the train and validation set...

DINO: DETR with Improved DeNoising Anchor Boxes for End-to-End Object Detection

Hao Zhang et 8 al.

Mar 7, 2022 in Arxiv
We present DINO (\textbf{D}ETR with \textbf{I}mproved de\textbf{N}oising anch\textbf{O}r boxes), a state-of-the-art end-to-end object detector. % in this paper. DINO improves over previous DETR-like models in performance and efficiency by using a contrastive way for denoising training, a mixed query selection method for anchor initialization, and a look forward twice scheme for box prediction. DIN...

Study of $ψ(3686)\rightarrowΛ\barΛω$

BESIII Collaboration, J. H. Zou et 563 al.

Jul 24, 2022 in Arxiv
Based on a data sample of $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fraction of $\psi(3686)\rightarrow\Lambda\bar{\Lambda}\omega$ is measured to be $\rm (3.30\pm0.34(stat.)\pm0.29(syst. ))\times10^{-5}$ for the first time. The invariant mass spectrum of $\Lambda\omega$ (or $\bar{\Lambda}\omega$) shows evidence of a resona...

Search for the weak decay $ψ(3686) \to Λ c^{ plus } \barΣ^- plus c.c

BESIII Collaboration, J. Zu et 581 al.

Jul 22, 2022 in Arxiv
Using $(448.1 \pm 2.9) \times 10^{6}$ $\psi(3686)$ events collected with the BESIII detector, we perform the first search for the weak baryonic decay $\psi(3686) \to \Lambda_c^{+} \bar{\Sigma}^- +c.c.$. The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction ($\mathcal B$) of $\psi(3686) \to \Lambda_c^{+} \bar{\Si...

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ c^ plus \rightarrow Σ^{0} K^ plus $ and $Σ^{ plus } K {S}^0$

BESIII Collaboration, J. H. Zou et 578 al.

Jul 22, 2022 in Arxiv
Based on a sample of 4.4 $\mathrm{fb}^{-1}$ of $e^{+}e^{-}$ annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays $\Lambda_c^+ \rightarrow \Sigma^0 K^+$ and $\Lambda_{c}^{+} \rightarrow \Sigma^+ K_{S}^0$ are studied. The ratio of the branching fraction $\mathcal{B}(\Lambda_c^+ \rightarrow \Sigma^0 K^+)$...

First Observation of the Semileptonic Decay $Λ c^ plus \rightarrow pK^- e^ plus ν e$

M. Ablikim, J. H. Zou et 572 al.

Jul 23, 2022 in Arxiv
Using $4.5 \mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data samples collected at the center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider, a first study of $\Lambda_c^+$ decaying semileptonically into the inclusive $pK^-$ system $\Lambda_c^+\rightarrow pK^-e^+\nu_e$ is performed. The $\Lambda_c^+\rightarrow pK^-e^+\nu_e$ decay is observed with ...

CausalMTA: Eliminating the User Confounding Bias for Causal Multi-touch Attribution

Di Yao, Jingping Bi et 4 al.

Dec 21, 2021 in Arxiv
Multi-touch attribution (MTA), aiming to estimate the contribution of each advertisement touchpoint in conversion journeys, is essential for budget allocation and automatically advertising. Existing methods first train a model to predict the conversion probability of the advertisement journeys with historical data and calculate the attribution of each touchpoint using counterfactual predictions. A...

Learning High-quality Proposals for Acne Detection

Jianwei Zhang, Dan Du et 6 al.

Jul 8, 2022 in Arxiv
Acne detection is crucial for interpretative diagnosis and precise treatment of skin disease. The arbitrary boundary and small size of acne lesions lead to a significant number of poor-quality proposals in two-stage detection. In this paper, we propose a novel head structure for Region Proposal Network to improve the proposals' quality in two ways. At first, a Spatial Aware Double Head(SADH) struc...

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