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Prototype-based classifier learning for long-tailed visual recognition

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Science China(Information Sciences) 2022年第6期65卷 62-76页

作者： Xiu-Shen WEI Shu-Lin XU hao chen liang XIAO Yuxin PENG School of Computer Science and Engineering Nanjing University of Science and Technology Key Lab of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education and Jiangsu Key Lab of Image and Video Understanding for Social Security Wangxuan Institute of Computer Technology Peking University State Key Laboratory of Integrated Services Networks Xidian University

In this paper, we tackle the long-tailed visual recognition problem from the categorical prototype perspective by proposing a prototype-based classifier learning(PCL) method. Specifically, thanks to the generalization ability and robustness, categorical prototypes reveal their advantages of representing the category semantics. Coupled with their class-balance characteristic, categorical prototypes also show potential for handling data imbalance. In our PCL, we propose to generate the categorical classifiers based on the prototypes by performing a learnable mapping function. To further alleviate the impact of imbalance on classifier generation, two kinds of classifier calibration approaches are designed from both prototype-level and example-level aspects. Extensive experiments on five benchmark datasets, including the large-scale iNaturalist, Places-LT,and ImageNet-LT, justify that the proposed PCL can outperform state-of-the-arts. Furthermore, validation experiments can demonstrate the effectiveness of tailored designs in PCL for long-tailed problems.

关键词： long-tailed distribution categorical prototype classifier generation classifier calibration class imbalance

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A Novel Self-Supervised Learning Network for Binocular Disparity Estimation

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 209-229页

作者： Jiawei Tian Yu Zhou Xiaobing chen Salman A.AlQahtani Hongrong chen Bo Yang Siyu Lu Wenfeng Zheng Department of Computer Science and Engineering Major in Bio Artificial IntelligenceHanyang UniversityAnsan-si15577Republic of Korea School of Electrical and Computer Engineering Louisiana State UniversityBaton RougeLA 70803USA Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11574Saudi Arabia School of Automation University of Electronic Science and Technology of ChinaChengdu610054China

Two-dimensional endoscopic images are susceptible to interferences such as specular reflections and monotonous texture illumination,hindering accurate three-dimensional lesion reconstruction by surgical *** study proposes a novel end-to-end disparity estimation model to address these *** approach combines a Pseudo-Siamese neural network architecture with pyramid dilated convolutions,integrating multi-scale image information to enhance robustness against lighting *** study introduces a Pseudo-Siamese structure-based disparity regression model that simplifies left-right image comparison,improving accuracy and *** model was evaluated using a dataset of stereo endoscopic videos captured by the Da Vinci surgical robot,comprising simulated silicone heart sequences and real heart video *** results demonstrate significant improvement in the network’s resistance to lighting interference without substantially increasing ***,the model exhibited faster convergence during training,contributing to overall performance *** study advances endoscopic image processing accuracy and has potential implications for surgical robot applications in complex environments.

关键词： Parallax estimation parallax regression model self-supervised learning Pseudo-Siamese neural network pyramid dilated convolution binocular disparity estimation

Selective lithium recovery from black powder of spent lithiumion batteries via sulfation reaction:phase conversion and impurities influence

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Rare Metals 2023年第7期42卷 2350-2360页

作者： hao Liu Jia-liang Zhang Guo-Qiang liang Meng Wang Yong-Qiang chen cheng-Yan Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Green Recycling and Extraction of Metals Beijing100083China

The aim of this study is to present a new understanding for the selective lithium recovery from spent lithium-ion batteries(LIBs)via sulfation *** composition of roasting products and reaction behavior of impurity elements were analyzed through thermodynamic ***,the effects of sulfuric acid dosage,roasting temperature,roasting time,and impurity elements were assessed on the leaching efficiency of valuable *** methods such as X-ray diffraction(XRD),scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS),and X-ray photoelectron spectroscopy(XPS)were employed to analyze the phase transformation mechanism during roasting *** results indicate that after sulfation roasting(n(H_(2)SO_(4)):n(Li)=0.5,550℃,2 h),94%lithium can be selectively recovered by water leaching and more than 95%Ni,Co,and Mn can be leached through acid leaching without the addition of reduction *** the sulfation roasting process,the lithium in LiNi_(x)Mn_(y)Co_zO_(2)is mainly converted to Li_(2)SO_(4),while the Ni,Co and Mn are first transformed to sulfate and then converted into oxide *** addition,impurity elements such as Al and F will combine with lithium to form LiF and LiAlO_(2),which will reduce the leaching rate of *** results provide a new understanding on the mechanisms of phase conversion during sulfation roasting and reveal the influence of impurity elements for the lithium recovery from spent LIBs.

关键词： Spent lithium-ion batteries(LIBs) Thermodynamic calculations Sulfation roasting Impurity elements Conversion mechanism

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MEK/ERK signaling pathway in apoptosis of SW620 cell line and inhibition effect of resveratrol

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Asian Pacific Journal of Tropical Medicine 2016年第1期9卷 46-50页

作者： hao chen Zhi-liang Jin Hai Xu Jingzhou Central Hospital Huangjiahu Hospital Hubei University of Chinese Medicine

Objective:To study the involvement of MAPK MEK/ERK signaling transduction pathway in the apoptosis process of SW620 tumor cell line and the inhibition effect of ***:SW620 cell lines were divided into 5 groups,namely,control ***98059 group,low-dose resveratrol group,mid-dose resveratrol group and high-dose resveratrol *** inhibition rate of cell proliferation was detected by MTT *** expression of apoptotic molecules and MEK/ERK signaling pathway related proteins were assayed by realtime PCR and Western ***:Compared with control group,the proliferation of cells treated with resveratrol was significantly *** the case of apoptotic molecules,the expression of Bax,Caspase 3 and Caspase 9 was increased significantly while the expression of anti-apoptotic molecule Bcl2 was decreased significantly in resveratrol groups with a dosedependent *** the case of molecules in MEK/ERK signaling pathway,the expression of Ras,Raf,MEK and ERKl/2 was decreased significantly in resveratrol groups with a dose-dependent ***:PD98059 and resveratrol can effectively inhibit the proliferation of SW620 through inhibiting the MEK/ERK signaling pathway.

关键词： Colon cancer Apoptosis MEK/ERK signaling pathway Resveratrol Inhibition of proliferation

Impact of postoperative glycemic control and nutritional status on clinical outcomes after total pancreatectomy

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World Journal of Gastroenterology 2017年第2期23卷 265-274页

作者： hao-Jun Shi chen Jin De-liang Fu Department of Pancreatic Surgery Pancreatic Disease InstituteHuashan HospitalFudan UniversityShanghai 200040China

AIM To evaluate the impact of glycemic control and nutritional status after total pancreatectomy(TP) on complications, tumor recurrence and overall *** Retrospective records of 52 patients with pancreatic tumors who underwent TP were collected from 2007 to 2015. A series of clinical parameters collected before and after surgery, and during the follow-up were evaluated. The associations of glycemic control and nutritional status with complications, tumor recurrence and long-term survival were determined. Risk factors for postoperative glycemic control and nutritional status were *** High early postoperative fasting blood glucose(FBG) levels(OR = 4.074, 95%CI: 1.188-13.965, P = 0.025) and low early postoperative prealbumin levels(OR = 3.816, 95%CI: 1.110-13.122, P = 0.034) were significantly associated with complications after TP. Postoperative Hb A1 c levels over 7%(HR = 2.655, 95%CI: 1.299-5.425, P = 0.007) were identified as one of the independent risk factors for tumor recurrence. Patients with postoperative Hb A1 c levels over 7% had much poorer overall survival than those with Hb A1 c levels less than 7%(9.3 mo vs 27.6 mo, HR = 3.212, 95%CI: 1.147-8.999, P = 0.026). Patients with long-term diabetes mellitus(HR = 15.019, 95%CI: 1.278-176.211, P= 0.031) and alcohol history(B = 1.985, SE = 0.860, P = 0.025) tended to have poor glycemic control and lower body mass index levels after TP, *** At least 3 mo are required after TP to adapt to diabetes and recover nutritional status. Glycemic control appears to have more influence over nutritional status on longterm outcomes after TP. Improvement in glycemic control and nutritional status after TP is important to prevent early complications and tumor recurrence, and improve survival.

关键词： Total pancreatectomy Glycemic control Nutritional status Complication Tumor recurrence Prognosis

Visualization of integrin molecules by fluorescence imaging and techniques

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BIOCELL 2021年第2期45卷 229-257页

作者： chen CAI hao SUN liang HU ZHIChao FAN Department of Immunology School of MedicineUConn HealthFarmington06030USA Department of Medicine University of CaliforniaSan DiegoLa Jolla92093USA Cardiovascular Institute of Zhengzhou University Department of CardiologyThe First Affiliated Hospital of Zhengzhou UniversityZhengzhou450051China

Integrin molecules are transmembraneαβheterodimers involved in cell adhesion,trafficking,and *** activation,integrins undergo dynamic conformational changes that regulate their affinity to *** physiological functions and activation mechanisms of integrins have been heavily discussed in previous studies and reviews,but the fluorescence imaging techniques-which are powerful tools for biological studies-have *** we review the fluorescence labeling methods,imaging techniques,as well as Förster resonance energy transfer assays used to study integrin expression,localization,activation,and functions.

关键词： Integrins Fluorescence imaging Fluorescence labeling Live-cell imaging Super-resolution imaging Intravital imaging FRET

Preoperative evaluation of pancreatic ductal adenocarcinoma with synchronous liver metastasis: Diagnosis and assessment of unresectability

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World Journal of Gastroenterology 2016年第45期22卷 10024-10037页

作者： hao-Jun Shi chen Jin De-liang Fu Department of Pancreatic Surgery Pancreatic Disease Institute Huashan Hospital Fudan University

AIM To identify predictors for synchronous liver metastasis from resectable pancreatic ductal adenocarcinoma(PDAC) and assess unresectability of synchronous liver *** Retrospective records of PDAC patients with synchronous liver metastasis who underwent simultaneous resections of primary PDAC and synchronous liver metastasis, or palliative surgical bypass, were collected from 2007 to 2015. A series of pre-operative clinical parameters, including tumor markers and inflammation-based indices, were analyzed by logistic regression to figure out predictive factors and assess unresectability of synchronous liver metastasis. Cox regression was used to identify prognostic factors in liver-metastasized PDAC patients after surgery, with intention to validate their conformance to the indications of simultaneous resections and palliative surgical bypass. Survival of patients from different groups were analyzed by the Kaplan-Meier method. Intra- and post-operative courses were compared, including complications. PDAC patients with no distant metastases who underwent curative resection served as the control *** CA125 > 38 U/mL(OR = 12.397, 95%CI: 5.468-28.105, P 62 U/mL(OR = 5.181, 95%CI: 1.612-16.665, P = 0.006) and age > 62 years(OR = 3.921, 95%CI: 1.217-12.632, P = 0.022) correlated with unresectability of synchronous liver metastasis, both of which also indicated a worse long-term outcome of liver-metastasized PDAC patients after surgery. After the simultaneous resections, patients with postoperatively elevated serum CA125 levels had shorter survival than those with post-operatively reduced serum CA125 levels(7.7 mo vs 16.3 mo, P = 0.013). The survival of liver-metastasized PDAC patients who underwent the simultaneous resections was similar to that of non-metastasized PDAC patients who underwent cu

关键词： CA125 Pancreatic ductal adenocarcinoma Liver metastasis Unresectability Prognosis

An Aerial Target Recognition Algorithm Based on Self-Attention and LSTM

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Computers, Materials & Continua 2024年第10期81卷 1101-1121页

作者： Futai liang Xin chen Song He Zihao Song hao Lu Department of Intelligence Early Warning AcademyWuhan430019China 31121 PLA Troops Nanjing210000China Information Technology Room Early Warning AcademyWuhan430019China

In the application of aerial target recognition,on the one hand,the recognition error produced by the single measurement of the sensor is relatively large due to the impact of *** the other hand,it is difficult to apply machine learning methods to improve the intelligence and recognition effect due to few or no actual measurement *** at these problems,an aerial target recognition algorithm based on self-attention and Long Short-Term Memory Network(LSTM)is *** can effectively extract temporal *** attention mechanism calculates the weight of each input element and applies the weight to the hidden state of the LSTM,thereby adjusting the LSTM’s attention to the *** combination retains the learning ability of LSTM and introduces the advantages of the attention mechanism,making the model have stronger feature extraction ability and adaptability when processing sequence *** addition,based on the prior information of the multidimensional characteristics of the target,the three-point estimation method is adopted to simulate an aerial target recognition dataset to train the recognition *** experimental results show that the proposed algorithm achieves more than 91%recognition accuracy,lower false alarm rate and higher robustness compared with the multi-attribute decision-making(MADM)based on fuzzy numbers.

关键词： Aerial target recognition long short-term memory network self-attention three-point estimation

Two paths, one goal: mechanism of calcium homeostasis to balance plant growth and immunity

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Science China Life Sciences 2025年第1期 306-308页

作者： Aziz Ul Ikram Yanping Jing Huan chen Jian chen International Genome Center Jiangsu University Joint Center for Single Cell Biology School of Agriculture and BiologyShanghai Jiao Tong University

Calcium(Ca2+) is an essential nutrient and a cellular signal in plants. The level of free Ca2+in the apoplast is ～10,000-fold higher than that in the cytoplasm at the resting state. This large Ca2+level gradient across the membrane between the interior and exterior can cause Ca2+overload and toxicity. Plants have evolved mechanisms to export Ca2+out of the cytoplasm or store it in intracellular organelles, such as endoplasmic reticulum（ER）, mitochondria, and vacuole.

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