178 Hits in 2.2 sec

Front Matter: Volume 11184

Baojun Li, Changyuan Yu, Xuping Zhang, Xinliang Zhang, Daoxin Dai
2019 Optoelectronic Devices and Integration VIII  
doi:10.1117/12.2560497 fatcat:r6m7remvdbag7jgf2qbv34dtqq

Single-Shot Bidirectional Pyramid Networks for High-Quality Object Detection [article]

Xiongwei Wu, Daoxin Zhang, Jianke Zhu, Steven C.H. Hoi
2018 arXiv   pre-print
Recent years have witnessed many exciting achievements for object detection using deep learning techniques. Despite achieving significant progresses, most existing detectors are designed to detect objects with relatively low-quality prediction of locations, i.e., often trained with the threshold of Intersection over Union (IoU) set to 0.5 by default, which can yield low-quality or even noisy detections. It remains an open challenge for how to devise and train a high-quality detector that can
more » ... ieve more precise localization (i.e., IoU>0.5) without sacrificing the detection performance. In this paper, we propose a novel single-shot detection framework of Bidirectional Pyramid Networks (BPN) towards high-quality object detection, which consists of two novel components: (i) a Bidirectional Feature Pyramid structure for more effective and robust feature representations; and (ii) a Cascade Anchor Refinement to gradually refine the quality of predesigned anchors for more effective training. Our experiments showed that the proposed BPN achieves the best performances among all the single-stage object detectors on both PASCAL VOC and MS COCO datasets, especially for high-quality detections.
arXiv:1803.08208v1 fatcat:pz5gra4k3zc4bd7sppzknbse7e

Salient Object Ranking with Position-Preserved Attention [article]

Hao Fang, Daoxin Zhang, Yi Zhang, Minghao Chen, Jiawei Li, Yao Hu, Deng Cai, Xiaofei He
2021 arXiv   pre-print
Instance segmentation can detect where the objects are in an image, but hard to understand the relationship between them. We pay attention to a typical relationship, relative saliency. A closely related task, salient object detection, predicts a binary map highlighting a visually salient region while hard to distinguish multiple objects. Directly combining two tasks by post-processing also leads to poor performance. There is a lack of research on relative saliency at present, limiting the
more » ... cal applications such as content-aware image cropping, video summary, and image labeling. In this paper, we study the Salient Object Ranking (SOR) task, which manages to assign a ranking order of each detected object according to its visual saliency. We propose the first end-to-end framework of the SOR task and solve it in a multi-task learning fashion. The framework handles instance segmentation and salient object ranking simultaneously. In this framework, the SOR branch is independent and flexible to cooperate with different detection methods, so that easy to use as a plugin. We also introduce a Position-Preserved Attention (PPA) module tailored for the SOR branch. It consists of the position embedding stage and feature interaction stage. Considering the importance of position in saliency comparison, we preserve absolute coordinates of objects in ROI pooling operation and then fuse positional information with semantic features in the first stage. In the feature interaction stage, we apply the attention mechanism to obtain proposals' contextualized representations to predict their relative ranking orders. Extensive experiments have been conducted on the ASR dataset. Without bells and whistles, our proposed method outperforms the former state-of-the-art method significantly. The code will be released publicly available.
arXiv:2106.05047v2 fatcat:bkmvkkcn4fflhatv665qi5cnqe

Tc17 Cells in Patients with Uterine Cervical Cancer

Yan Zhang, Fei Hou, Xin Liu, Daoxin Ma, Youzhong Zhang, Beihua Kong, Baoxia Cui, Jian-Xin Gao
2014 PLoS ONE  
The existence of Tc17 cells was recently shown in several types of infectious and autoimmune diseases, but their distribution and functions in uterine cervical cancer (UCC) have not been fully elucidated. Methods: The frequency of Tc17 cells in peripheral blood samples obtained from UCC patients, cervical intraepithelial neoplasia (CIN) patients and healthy controls was determined by flow cytometry. Besides, the prevalence of Tc17 cells and their relationships to Th17 cells and Foxp3-expressing
more » ... T cells as well as microvessels in tissue samples of the patients were assessed by immunohistochemistry staining. Results: Compared to controls, patients with UCC or CIN had a higher proportion of Tc17 cells in both peripheral blood and cervical tissues, but the level of Tc17 cells in UCC tissues was significantly higher than that in CIN tissues. Besides, the increased level of Tc17 in UCC patients was associated with the status of pelvic lymph node metastases and increased microvessel density. Finally, significant correlations of infiltration between Tc17 cells and Th17 cells or Foxp3-expressing T cells were observed in UCC and CIN tissues. Conclusions: This study indicates that Tc17 cell infiltration in cervical cancers is associated with cancer progression accompanied by increased infiltrations of Th17 cells and regulatory T cells as well as promoted tumor vasculogenesis.
doi:10.1371/journal.pone.0086812 pmid:24523865 pmcid:PMC3921122 fatcat:gbo4hoaz2fg7xh4tdn3ovfygw4

Horizontal-to-Vertical Video Conversion [article]

Tun Zhu, Daoxin Zhang, Yao Hu, Tianran Wang, Xiaolong Jiang, Jianke Zhu, Jiawei Li
2021 arXiv   pre-print
Alongside the prevalence of mobile videos, the general public leans towards consuming vertical videos on hand-held devices. To revitalize the exposure of horizontal contents, we hereby set forth the exploration of automated horizontal-to-vertical (abbreviated as H2V) video conversion with our proposed H2V framework, accompanied by an accurately annotated H2V-142K dataset. Concretely, H2V framework integrates video shot boundary detection, subject selection and multi-object tracking to
more » ... the subject-preserving conversion, wherein the key is subject selection. To achieve so, we propose a Rank-SS module that detects human objects, then selects the subject-to-preserve via exploiting location, appearance, and salient cues. Afterward, the framework automatically crops the video around the subject to produce vertical contents from horizontal sources. To build and evaluate our H2V framework, H2V-142K dataset is densely annotated with subject bounding boxes for 125 videos with 132K frames and 9,500 video covers, upon which we demonstrate superior subject selection performance comparing to traditional salient approaches, and exhibit promising horizontal-to-vertical conversion performance overall. By publicizing this dataset as well as our approach, we wish to pave the way for more valuable endeavors on the horizontal-to-vertical video conversion task.
arXiv:2101.04051v2 fatcat:x65xhdepvzb4dhe2yxh27warhq

The prevalence of benign prostatic hyperplasia in mainland China: evidence from epidemiological surveys

Wenying Wang, Yuwen Guo, Daoxin Zhang, Ye Tian, Xiaonan Zhang
2015 Scientific Reports  
./1992 NA Urumchi (U/R) ≥ 60 stratified cluster random Standard national criteria in China NA 647 290 44.82 [40.99- 48.65] 5 Zhang et al./1995 NA Pinghu (U/R) ≥ 40 random Prostate  ...  5826 1761 30.23 [29.05- 31.41] 6 Yu et al./2011 trainee Baicheng (U) ≥ 60 cluster random Criteria from specialized academic conferences in China NA 2826 610 21.59 [20.07- 23.10] 5 Zhang  ... 
doi:10.1038/srep13546 pmid:26306721 pmcid:PMC4549711 fatcat:3ldl7e2zu5hdtpzphigwmgqbx4

Hybrid silicon photonic devices with two-dimensional materials

Jiang Li, Chaoyue Liu, Haitao Chen, Jingshu Guo, Ming Zhang, Daoxin Dai
2020 Nanophotonics  
Zhang et al. patterned the graphene sheet to be QD-like arrays [98] , and then the defect midgap states band electron trapping centers are formed on the boundary and the surface of graphene QDs.  ... 
doi:10.1515/nanoph-2020-0093 fatcat:5ni5o74tu5dxtep5mhefxeo2k4

Design Rule of Mach-Zehnder Interferometer Sensors for Ultra-High Sensitivity

Yiwei Xie, Ming Zhang, Daoxin Dai
2020 Sensors  
A design rule for a Mach-Zehnder interferometer (MZI) sensor is presented, allowing tunable sensitivity by appropriately choosing the MZI arm lengths according to the formula given in this paper. The present MZI sensor designed by this method can achieve an ultra-high sensitivity, which is much higher than any other traditional MZI sensors. An example is given with silicon-on-insulator (SOI) nanowires and the device sensitivity is as high as 106 nm/refractive-index -unit (or even higher), by
more » ... osing the MZI arms appropriately. This makes it possible for one to realize a low-cost optical sensing system with a detection limit as high as 10−6 refractive-index-unit, even when a cheap optical spectrum analyzer with low-resolution (e.g., 1 nm) is used for the wavelength-shift measurement.
doi:10.3390/s20092640 pmid:32380779 pmcid:PMC7248966 fatcat:r6ysmw2v65c5bm5mbll4vxyavy

Subwavelength silicon photonics for on-chip mode-manipulation

Chenlei Li, Ming Zhang, Hongnan Xu, Ying Tan, Yaocheng Shi, Daoxin Dai
2021 PhotoniX  
AbstractOn-chip mode-manipulation is one of the most important physical fundamentals for many photonic integrated devices and circuits. In the past years, great progresses have been achieved on subwavelength silicon photonics for on-chip mode-manipulation by introducing special subwavelength photonic waveguides. Among them, there are two popular waveguide structures available. One is silicon hybrid plasmonic waveguides (HPWGs) and the other one is silicon subwavelength-structured waveguides
more » ... Gs). In this paper, we focus on subwavelength silicon photonic devices and the applications with the manipulation of the effective indices, the modal field profiles, the mode dispersion, as well as the birefringence. First, a review is given about subwavelength silicon photonics for the fundamental-mode manipulation, including high-performance polarization-handling devices, efficient mode converters for chip-fiber edge-coupling, and ultra-broadband power splitters. Second, a review is given about subwavelength silicon photonics for the higher-order-mode manipulation, including multimode converters, multimode waveguide bends, and multimode waveguide crossing. Finally, some emerging applications of subwavelength silicon photonics for on-chip mode-manipulation are discussed.
doi:10.1186/s43074-021-00032-2 fatcat:alhjh7n7abcntnoc54zun5eiju

Resonance modes of plasmonic nanorod metamaterials and their applications

Junxi Zhang, Zhijia Hu, Kang Xie, Yongqin Wei, Haoyu Wang, Fei Wang, Taiming Liang, Sonia Ghafoor, Pei Wang, Guangtao Fei, Lide Zhang, Lin Zhang (+3 others)
2019 AOPC 2019: Nanophotonics  
Plasmonic nanorod metamaterials exhibit transversal and longitudinal resonance modes. It is found that the resonance intensity of the transversal modes (T-Modes) excited by the p-polarized wave is obviously larger than the intensity for the s-polarized wave at the wavelength of the transversal resonance, and the resonance intensity of the longitudinal modes (L-Modes) excited by the s-polarized wave is clearly larger than the intensity for the p-polarized wave at the longitudinal resonance
more » ... ngth, indicating a distinct polarization characteristics, which results from excitation of the different resonance modes of surface plasmons at different wavelengths. Moreover, the polarization behavior in near field regions for the different resonance modes has been demonstrated by the electric field distributions of the plasmonic nanorods based on FDTD simulation. In addition, the working wavelength of the polarizer can be tuned by the diameter and length of the silver nanorods in the visible spectral range, higher extinction ratios and lower insertion losses can be achieved based on the different resonance modes associated with the different polarizations. The polarizers will be a promising candidate for its potential applications in integration of nanophotonic devices.
doi:10.1117/12.2547790 fatcat:hcy4ai5eivdlte6l4s3uo2bykm

TOND1confers tolerance to nitrogen deficiency in rice

Yangjun Zhang, Lubin Tan, Zuofeng Zhu, Lixing Yuan, Daoxin Xie, Chuanqing Sun
2015 The Plant Journal  
Nitrogen (N), the most important mineral nutrient for plants, is critical to agricultural production systems. N deficiency severely affects rice growth and decreases rice yields. However, excessive use of N fertilizer has caused severe pollution to agricultural and ecological environments. The necessity of breeding of crops that require lower input of N fertilizer has been recognized. Here we identified a major quantitative trait locus on chromosome 12, Tolerance Of Nitrogen Deficiency 1
more » ... , that confers tolerance to N deficiency in the indica cultivar Teqing. Sequence verification of 75 indica and 75 japonica cultivars from 18 countries and regions demonstrated that only 27.3% of cultivars (41 indica cultivars) contain TOND1, whereas 72.7% of cultivars, including the remaining 34 indica cultivars and all 75 japonica cultivars, do not harbor the TOND1 allele. Over-expression of TOND1 increased the tolerance to N deficiency in the TOND1deficient rice cultivars. The identification of TOND1 provides a molecular basis for breeding rice varieties with improved grain yield despite decreased input of N fertilizers.
doi:10.1111/tpj.12736 pmid:25439309 pmcid:PMC4329406 fatcat:7uzbkr6atbairmtuyi3nahpzpa

Aberrant frequency of TNFR2+ Treg and related cytokines in patients with CIN and cervical cancer

Teng Zhang, Jun Jiao, Xinlin Jiao, Lu Zhao, Xinli Tian, Qing Zhang, Daoxin Ma, Baoxia Cui
2017 OncoTarget  
Author contributions Baoxia Cui and Daoxin Ma conceived and designed the experiments. Teng Zhang and Jun Jiao collected samples. Teng Zhang, Xinlin Jiao, and Lu Zhao performed the experiments.  ...  Teng Zhang, Xinli Tian, and Qing Zhang analyzed the data. Teng Zhang wrote the paper. All authors have read and approved the final manuscript.  ... 
doi:10.18632/oncotarget.23581 pmid:29435163 pmcid:PMC5797034 fatcat:qrmgq3t3nzhvvglfulf5hlzu6a

On-chip single-mode CdS nanowire laser

Qingyang Bao, Weijia Li, Peizhen Xu, Ming Zhang, Daoxin Dai, Pan Wang, Xin Guo, Limin Tong
2020 Light: Science & Applications  
By integrating a free-standing cadmium sulfide (CdS) nanowire onto a silicon nitride (SiN) photonic chip, we demonstrate a highly compact on-chip single-mode CdS nanowire laser. The mode selection is realized using a Mach-Zehnder interferometer (MZI) structure. When the pumping intensity exceeds the lasing threshold of 4.9 kW/cm2, on-chip single-mode lasing at ~518.9 nm is achieved with a linewidth of 0.1 nm and a side-mode suppression ratio of up to a factor of 20 (13 dB). The output of the
more » ... owire laser is channelled into an on-chip SiN waveguide with high efficiency (up to 58%) by evanescent coupling, and the directional coupling ratio between the two output ports can be varied from 90 to 10% by predesigning the coupling length of the SiN waveguide. Our results open new opportunities for both nanowire photonic devices and on-chip light sources and may pave the way towards a new category of hybrid nanolasers for chip-integrated applications.
doi:10.1038/s41377-020-0277-0 pmid:32194956 pmcid:PMC7073330 fatcat:od7snybgrndmpomungkwu7pw2u

Proteomics Study of COI1-regulated Proteins inArabidopsisFlower

Lingling Chua, Xiaoyi Shan, Junxia Wang, Wen Peng, Guiyou Zhang, Daoxin Xie
2010 Journal of Integrative Plant Biology  
Casati P, Zhang X, Burlingame AL, Walbot V (2005) Analysis of leaf proteome after UV-B irradiation in maize lines differing in sensitivity. Mol. Cell Proteomics 4, 1673-1685.  ... 
doi:10.1111/j.1744-7909.2010.00938.x pmid:20377703 fatcat:hpctposcgjev3ka6f7ims7fey4

Resistance-Based Connectivity Model to Construct Corridors of the Przewalski's Gazelle (Procapra Przewalskii) in Fragmented Landscape

Jingjie Zhang, Feng Jiang, Zhenyuan Cai, Yunchuan Dai, Daoxin Liu, Pengfei Song, Yuansheng Hou, Hongmei Gao, Tongzuo Zhang
2021 Sustainability  
Habitat connectivity is indispensable for the survival of species that occupy a small habitat area and have isolated habitat patches from each other. At present, the development of human economy squeezes the living space of wildlife and interferes and hinders the dispersal of species. The Przewalski's gazelle (Procapra przewalskii) is one of the most endangered ungulates, which has experienced a significant reduction in population and severe habitat shrinkage. Although the population of this
more » ... cies has recovered to a certain extent, human infrastructure severely hinders the gene flow between several patches of this species. Therefore, we used the maximum entropy (MaxEnt) model to simulate the habitat suitability of the Przewalski's gazelle. In addition, we combined habitat suitability and ecological characteristics of the species to obtain eight habitat patches. Finally, we used the least-cost path (LCP) and circuit theory based on the resistance model to simulate the landscape network of this species. The results showed that habitat patches and connectivity in the east of the Qinghai Lake were crucial to the communication between populations of the Przewalski gazelle, and our study provided important reference for the distribution of important habitats and the construction of corridor between patches. Our study aimed to provide habitat networks and maintain landscape connectivity for achieving the fundamental goal of protecting and revitalizing populations of the Przewalski's gazelle.
doi:10.3390/su13041656 fatcat:56gin3wnzjdspayms6isdchrka
« Previous Showing results 1 — 15 out of 178 results