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基于CNN和Transformer交叉教学的半监督医学图像分割

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陕西科技大学学报 2025年第1期43卷 185-192页

作者：杨云胡雯青杨虹吴亚男陕西科技大学电子信息与人工智能学院陕西西安710021 西安富德医疗电子有限公司陕西西安710075 西安计量技术研究院陕西西安710199

由于医学图像分割领域缺乏高质量的标注数据,半监督学习方法在医学图像语义分割任务中受到高度重视.为了充分利用卷积神经网络(Convolutional Neural Network,CNN)和Transformer在半监督学习中的优势,本文提出一种基于CNN与Transformer... 详细信息

由于医学图像分割领域缺乏高质量的标注数据,半监督学习方法在医学图像语义分割任务中受到高度重视.为了充分利用卷积神经网络(Convolutional Neural Network,CNN)和Transformer在半监督学习中的优势,本文提出一种基于CNN与Transformer交叉教学的半监督医学图像分割方法.该方法将经典的深度协同训练从一致性正则化简化为交叉教学,利用循环伪标签方案使两个网络的预测差异转换为无监督损失,以鼓励两个网络具有一致的低熵预测.所提方法在ISIC 2018数据集上进行实验,在采用20%的标注比例时,Dice系数和Jaccard系数分别达到87.25%和79.17%,相比于监督U-Net++的训练结果分别提升了2.89%和3.53%,并且优于目前主流的半监督学习方法,验证了所提方法在半监督医学图像分割上的有效性和泛化性.

关键词：半监督学习图像语义分割交叉教学循环伪标签

Variations in the oxytocin receptor gene and prosocial behavior:moderating effects of situational factors

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Integrative Zoology 2018年第6期13卷 687-697页

作者： nan wu Yanjie SU Teachers College of Beijing Union University Peking UniversityBeijingChina School of Psychological and Cognitive Sciences and Beijing Key Laboratory of Behavior and Mental Health Peking UniversityBeijingChina

Humans are the most prosocial primate species and they often exhibit high levels of prosocial behavior toward genetically unrelated *** evolutionary theories are not sufficient to explain the individual differences and mechanisms related to *** this study,we focused on the gene–situation interaction in prosocial behaviors,and the patterns of genotype variance related to cooperation and comforting in different *** explored the interaction between the oxytocin receptor(OXTR)gene and situations,and the genotype variance under low and high prosociality situations between outgroup and ingroup recipients in a sample of 422 Chinese *** was tested by measuring the prosocial tendencies,and prosocial behaviors were tested in cooperation and comforting *** single nucleotide polymorphisms(SNPs)were genotyped using polymerase chain reaction–restriction fragment length polymorphism *** results suggested that the relationship between OXTR SNPs(specifically rs13316193,rs1042778 and rs237887)and prosocial behavior varied across different situations,and that the associations were moderated by the recipient’s identity and the prosocial *** findings indicate the action of a moderating mechanism between the OXTR gene and prosocial behaviors according to situational factors.

关键词： group membership oxytocin receptor gene prosocial behavior prosocial cost

A HIGHLY ACCURATE NUMERICAL METHOD FOR FLOW PROBLEMS WITH INTERACTIONS OF DISCONTINUITIES

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Journal of Computational Mathematics 2002年第1期20卷 1-14页

作者： Xiao-nan wu You-lan Zhu Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong Department of Mathematics University of North Carolina at CharlotteCharlotteNC 28223

Focuses on a study wherein a type of shock fitting method has been used to solve dimensional flow problems with interactions of various discontinuities. Discretization of the transformed equations; Numerical results; ... 详细信息

关键词： interaction of discontinuity shock-fitting shock-capturing

Resonance System Reliability and Sensitivity Analysis Method for Axially FGM Pipes Conveying Fluid with Adaptive Kriging Model

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Acta Mechanica Solida Sinica 2022年第6期35卷 1021-1029页

作者： Xin Fan nan wu Yongshou Liu Qing Guo School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710129China

This paper aims to solve the resonance failure probability and develop an effective method to estimate the effects of variables and failure modes on failure probability of axially functionally graded material(FGM)pipe conveying ***,the natural frequency of axially FGM pipes conveying fluid is calculated using the differential quadrature method(DQM).A variable sensitivity analysis(VSA)is introduced to measure the effect of each random variable,and a mode sensitivity analysis(MSA)is introduced to acquire the importance ranking of failure ***,an active learning Kriging(ALK)method is established to calculate the resonance failure probability and sensitivity indices,which greatly improves the application of resonance reliability analysis for pipelines in engineering *** on the resonance reliability analysis method,the effects of fluid velocity,volume fraction and fluid density of axially FGM pipe conveying fluid on resonance reliability are *** results demonstrate that the proposed method has great performance in the anti-resonance analysis of pipes conveying fluid.

关键词： Resonance reliability analysis Simply supported pipe conveying fluid Differential quadrature method Variable sensitivity analysis Mode sensitivity analysis Active learning Kriging model

Comments on National guidelines for diagnosis and treatment of esophageal carcinoma 2022 in China(English version)

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Chinese Journal of Cancer Research 2022年第6期34卷 633-634页

作者： Yuan Feng nan wu Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Thoracic SurgeryⅡPeking University Cancer Hospital&InstituteBeijing 100142China

Esophageal cancer has always been one of the most common malignant tumors in the world, and China is one of the regions with the highest incidence. Although the incidence and mortality of esophageal cancer in China have shown a downward trend in recent years, according to the statistics of the prevalence of malignant tumor in China in2015, its morbidity and mortality rate still rank 6th and 4th among all malignant tumors, respectively.

关键词： esophageal mortality diagnosis

Call admission control scheme for real-time services in packet-switched OFDM wireless networks

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The Journal of China Universities of Posts and Telecommunications 2008年第1期15卷 80-84页

作者： HU nan wu Wei-ling School of Information Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

A call admission control scheme is proposed for real-time services in packet-switched orthogonal frequency division multiplexing （OFDM） wireless cellular networks. The main idea of the proposed scheme is to use maximum acceptance ratio to maintain maximum channel utilization for real-time services according to the desired packet-level and call- level quality-of-service （QoS） requirements. The acceptance ratio is periodically adjusted by using a time discrete Markov chain and Wiener prediction theory according to the varying traffic load. Extensive simulation results show that this algorithm maintains high channel utilization, even as it guarantees packet-level and call-level QoS requirements for real-time services.

关键词： call admission control OFDM packet transmission delay

Management guidelines for primary lung cancer 2018: Chinese standards in clinical practice

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Chinese Journal of Cancer Research 2019年第3期31卷 419-420页

作者： Chao Lyu nan wu Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Department of Thoracic Surgery II Peking University Cancer Hospital & Institute

Chinese guidelines for diagnosis and treatment of primary lung cancer 2018 are a set of clinical standards for screening, diagnosis and treatment of lung cancer in China (1). It covers the specialties of epidemiology, radiology, pathology, surgery, medical oncology, radiotherapy, endoscopy, nuclear medicine, and so on. The guidelines are referred to by physicians, medical students and patients, through providing comprehensive and detailed knowledge and recommendations in clinical practice on lung cancer diagnosis and treatment.

关键词： Chinese guidelines primary lung cancer diagnosis and treatment

Turbo equalization based on joint Gaussian,SIC-MMSE and LMMSE for nonlinear satellite channels

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Science China(Information Sciences) 2018年第4期61卷 151-163页

作者： Zheren LONG Hua WANG nan wu Jingming KUANG School of Information and Electronics Beijing Institute of Technology

The nonlinear distortion of wideband signal due to the filtering and efficiently operated high power amplifiers limits the performance of satellite communications. Volterra series can be used to describe the nonlinear satellite channels effectively. Most existing equalizers simply ignore the nonlinear terms or treat all the nonlinear combinations of symbols as interference. In this study, by properly exploiting information from nonlinear terms, we propose three turbo equalizers for nonlinear satellite channels, namely, joint Gaussian(JG), soft interference cancellation-minimum mean square error(SIC-MMSE) and linear minimum mean square error(LMMSE) equalizers. In JG and SIC-MMSE-based equalizers, both the linear and nonlinear terms that contain the symbol of interest are considered as desired signals. Accordingly, the required statistics are calculated based on the a priori probabilities of coded bits from output of channel *** LMMSE-based equalizer, we propose to calculate the extrinsic information from output of equalizer by excluding the prior information in both the linear and nonlinear terms. Simulation results demonstrate that the proposed equalizers significantly outperform the method which ignores the presence of nonlinear interferences. Moreover, the nonlinear terms that contain the symbol of interest can be exploited to further improve the performance of turbo equalization.

关键词： nonlinear satellite channel turbo equalization joint Gaussian soft interference cancellationminimum mean square error(SIC-MMSE) linear minimum mean square error(LMMSE)

Management guidelines for esophageal carcinoma 2018: Chinese standards in clinical practice

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Chinese Journal of Cancer Research 2019年第3期31卷 421-422页

作者： Yuan Feng nan wu Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Department of Thoracic Surgery Ⅱ Peking University Cancer Hospital & Institute

Esophageal carcinoma is now the sixth most common cause of cancer-related deaths worldwide. China, unfortunately, locates in the highest-risk area (often referred to as the “esophageal cancer belt”) spanning from northern Iran through the Central Asian republics and into northern China. The high prevalence areas spread from south to north in China. In the highest prevalence areas, the crude incidence of esophageal cancer can even reach more than 100/100,000, nearly 7 times that of the whole country. More than 210,000 patients die from esophageal cancer in China every year, accounting for half of the esophageal cancer-related death worldwide. It is currently one of the most threatening cancers for Chinese people.

关键词： Esophageal carcinoma cancer-related deaths worldwide Chinese people