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4. Few-Shot Object Detection via Classify-Free RPN

Author

Yu, Songlin, Yang, Zhiyu, Zhang, Shengchuan, Cao, Liujuan, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Liu, Qingshan, editor, Wang, Hanzi, editor, Ma, Zhanyu, editor, Zheng, Weishi, editor, Zha, Hongbin, editor, Chen, Xilin, editor, Wang, Liang, editor, and Ji, Rongrong, editor

Published
2024
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27. Analysis of bacterial community structure of Fuzhuan tea with different processing techniques

Author

Liu Shiquan, Li Taotao, Yu Songlin, Zhou Xiaohong, Liu Zhanjun, Zhang Xuemao, Cai Hongmei, and Hu Zhiyuan

Subjects
fuzhuan tea, processing technique, high-throughput sequencing, bacterial community structure, Biology (General), QH301-705.5
Abstract

The composition and diversity of microbial communities are of considerable significance to the quality development of Camellia sinensis (Fuzhuan tea). In this study, we examined differences in the bacterial community structures of loose, lightly-pressed, hand-made, and machine-pressed Fuzhuan teas and raw dark tea. We observed notable differences in the bacterial communities of the five groups, where there were only 51 consensus sequences. ASV/OTU Venn diagram, Chao1, Ace, Simpson indices, and dilution curve analyses consistently revealed that machine-pressed tea exhibited the highest bacterial diversity. Taxonomically, Actinobacteria, Firmicutes, Proteobacteria, and Cyanobacteria were the dominant bacterial phyla in each group, whereas Corynebacterium, Methylobacterium, and Bifidobacterium were the dominant genera. Our findings revealed significant differences in the bacterial community structures of different Fuzhuan tea products derived from the same raw material, with bacterial diversity rising with increased product compaction.

Published
2023
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35. ASPECTS-based reperfusion status on arterial spin labeling is associated with clinical outcome in acute ischemic stroke patients

Author

Yu, Songlin, J, Samantha, Liebeskind, David S, Yu, Dandan, Li, Ning, Qiao, Xin J, Shao, Xingfeng, Yan, Lirong, Yoo, Bryan, Scalzo, Fabien, Hinman, Jason D, Sharma, Latisha K, Rao, Neal, Jahan, Reza, Tateshima, Satoshi, Duckwiler, Gary R, Saver, Jeffrey L, Salamon, Noriko, and Wang, Danny JJ

Subjects
Biomedical and Clinical Sciences, Clinical Sciences, Neurosciences, Stroke, Biomedical Imaging, Brain Disorders, Bioengineering, Cerebrovascular, Adult, Aged, Aged, 80 and over, Brain Ischemia, Cerebral Arteries, Cerebral Infarction, Diffusion Magnetic Resonance Imaging, Endovascular Procedures, Female, Humans, Male, Middle Aged, Observer Variation, ROC Curve, Reperfusion, Reperfusion Injury, Spin Labels, Thrombolytic Therapy, Treatment Outcome, Acute ischemic stroke, arterial spin labelling, recanalization, reperfusion, reperfusion injury
Abstract

The purpose of this study was to develop and evaluate a scoring system for assessing reperfusion status based on arterial spin labeled (ASL) perfusion MRI in acute ischemic stroke (AIS) patients receiving thrombolysis and/or endovascular treatment. Pseudo-continuous ASL with background suppressed 3D GRASE was acquired along with DWI in 90 patients within 24 h post-treatment. An automatic reperfusion scoring system (auto-RPS) was devised based on the Alberta Stroke Program Early CT Score (ASPECTS) template, and compared with manual RPS and DWI-ASPECTS. TICI (thrombolysis in cerebral infarction) scores were graded in 48 patients who received endovascular treatment. Favorable outcomes were defined by a modified Rankin Scale score of 0-2 at three months. Auto-RPS was positively correlated with DWI-ASPECTS (ρ = 0.6, P

Published
2018

41. Multi-Delay ASL can identify leptomeningeal collateral perfusion in endovascular therapy of ischemic stroke

Author

Lou, Xin, Yu, Songlin, Scalzo, Fabien, Starkman, Sidney, Ali, Latisha K, Kim, Doojin, Rao, Neal M, Hinman, Jason D, Vespa, Paul M, Jahan, Reza, Tateshima, Satoshi, Gonzalez, Nestor R, Duckwiler, Gary R, Saver, Jeffrey L, Yoo, Bryan, Salamon, Noriko, Lyu, Jinhao, Ma, Lin, Wang, Danny JJ, and Liebeskind, David S

Subjects
Biomedical and Clinical Sciences, Clinical Sciences, Clinical Research, Cerebrovascular, Stroke, Brain Disorders, Biomedical Imaging, Neurosciences, Aged, Aged, 80 and over, Brain Ischemia, Cerebrovascular Circulation, Female, Humans, Infarction, Middle Cerebral Artery, Magnetic Resonance Angiography, Male, Meninges, Middle Aged, Perfusion Imaging, Spin Labels, collateral circulation, stroke, perfusion imaging, arterial spin-labeling, cerebral blood flow, Oncology and Carcinogenesis, Oncology and carcinogenesis
Abstract

Background and purposeMulti-delay arterial spin-labeling (ASL) perfusion imaging has been used as a promising modality to evaluate cerebral perfusion. Our aim was to assess the association of leptomeningeal collateral perfusion scores based on ASL parameters with outcome of endovascular treatment in patients with acute ischemic stroke (AIS) in the middle cerebral artery (MCA) territory.Materials and methodsASL data at 4 post-labeling delay (PLD) times (PLD = 1.5, 2, 2.5, 3 s) were acquired during routine clinical magnetic resonance examination on AIS patients prior to endovascular treatment. A 3-point scale of leptomeningeal collateral perfusion grade on 10 anatomic regions was determined based on arterial transit times (ATT), cerebral blood flow (CBF), and arterial cerebral blood volume (CBV), estimated by the multi-delay ASL protocol. Based on a 90-day modified Rankin Scale (mRS), the patients were dichotomized to moderate/good (mRS 0-3) and poor outcome (mRS 4-6) and the regional collateral flow scores were compared.ResultsFifty-five AIS patients with unilateral MCA stroke (mean 73.95±14.82 years) including 23 males were enrolled. Compared with poor outcome patients, patients with moderate to good outcomes had a significantly higher leptomeningeal collateral perfusion scores on CBV (3.01±2.11 vs. 1.82±1.51, p=0.024) but no differences on scores on CBF (2.31±1.61 vs. 1.66±1.32, p=0.231) and ATT (2.67±2.33 vs. 3.42±3.37, p=0.593).ConclusionsHigher leptomeningeal collateral perfusion scores on CBV images by ASL may be a specific marker of clinical outcome after endovascular treatment in patients with acute MCA ischemic stroke. Further study with larger sample size is warranted.

Published
2017

42. Trap-Assisted Tunneling in PbS Colloidal Quantum Dots Photodetector

Author

Yan, Qi, Deng, Wenjie, Ma, Xueliang, Wu, Yi, Li, Jingzhen, You, Congya, Yu, Songlin, Li, Liya, Yu, Xuyang, Wang, Peng, and Zhang, Yongzhe

Abstract

Currently, colloidal quantum dots (CQDs) photodetectors have shown significant advancement in the field of infrared photodetection. However, the immature analysis of dark current components hinders the realization of higher performance quantum dots optoelectrical devices. In this study, based on a PbS CQD photodetector, we employ a conventional dark current model of infrared photodetectors to analyze the dark current components of the device, yielding fitting results highly consistent with experimental observations. Our findings indicate that with increasing reverse bias, the dominant dark current components of the PbS CQD photodetector shift from diffusion (Diff) current, generation-recombination (G-R) current, and shunt (sh) current to trap-assisted tunneling (TAT) current. The band diagrams, recombination rates, carrier density distributions, and electric field intensity maps under different biases are further simulated, of which the theoretical results confirm that current components transition is attributed to the abundance of defects in quantum dot materials, leading to tunneling at the interface between the SnO2 layer and PbS-I layer under high bias conditions. Our work contributes to providing insight and direction for optimizing the CQD photodetector performances.

Published
2024
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