检索结果-南通市图书馆

MADRL-based UAV swarm non-cooperative game under incomplete information

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第6期37卷 293-306页

作者： Ershen WANG Fan LIU Chen HONG Jing GUO Lin ZHAO jian xue Ning HE School of Electronic and Information Engineering Shenyang Aerospace UniversityShenyang 110136China College of Robotics Beijing Union UniversityBeijing 100101China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China College of Smart City Beijing Union UniversityBeijing 100101China

Unmanned Aerial Vehicles(UAVs)play increasing important role in modern *** this paper,considering the incomplete observation information of individual UAV in complex combat environment,we put forward an UAV swarm non-cooperative game model based on Multi-Agent Deep Reinforcement Learning(MADRL),where the state space and action space are constructed to adapt the real features of UAV swarm air-to-air *** multi-agent particle environment is employed to generate an UAV combat scene with continuous observation *** recently popular MADRL methods are compared extensively in the UAV swarm noncooperative game model,the results indicate that the performance of Multi-Agent Soft Actor-Critic(MASAC)is better than that of other MADRL methods by a large *** swarm employing MASAC can learn more effective policies,and obtain much higher hit rate and win *** under different swarm sizes and UAV physical parameters are also performed,which implies that MASAC owns a well generalization ***,the practicability and convergence of MASAC are addressed by investigating the loss value of Q-value networks with respect to individual UAV,the results demonstrate that MASAC is of good practicability and the Nash equilibrium of the UAV swarm non-cooperative game under incomplete information can be reached.

关键词： UAV swarm Reinforcement learning Deep learning Multi-agent Non-cooperative game Nash equilibrium

Evaluation of teplizumab's efficacy and safety in treatment of type 1 diabetes mellitus:A systematic review and meta-analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第7期15卷 1615-1626页

作者： Xiao-Lan Ma Dan Ge xue-jian Hu Department of Endocrinology and Metabolism The Second Affiliated Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina

BACKGROUND Islets of Langerhans beta cells diminish in autoimmune type 1 diabetes mellitus(T1DM).Teplizumab,a humanized anti-CD3 monoclonal antibody,may help *** long-term implications on clinical T1DM development,safety,and efficacy are *** To assess the effectiveness and safety of teplizumab as a therapeutic intervention for individuals with *** A systematic search was conducted using four electronic databases(PubMed,Embase,Scopus,and Cochrane Library)to select publications published in peerreviewed journals written in *** odds ratio(OR)and risk ratio(RR)were calculated,along with their 95%*** assessed heterogeneity using Cochrane Q and I2 statistics and the appropriate P *** There were 8 randomized controlled trials(RCTs)in the current meta-analysis with a total of 1908 T1DM patients from diverse age cohorts,with 1361 patients receiving Teplizumab and 547 patients receiving a *** was found to have a substantial link with a decrease in insulin consumption,with an OR of 4.13(95%CI:1.72 to 9.90).Teplizumab is associated with an improved Cpeptide response(OR 2.49;95%CI:1.62 to 3.81)and a significant change in Glycated haemoglobin A1c(HbA1c)levels in people with type 1 diabetes[OR 1.75(95%CI:1.03 to 2.98)],and it has a RR of 0.71(95%CI:0.53 to 0.95).CONCLUSION In type 1 diabetics,teplizumab decreased insulin consumption,improved C-peptide response,and significantly changed HbA1c levels with negligible side *** appears to improve glycaemic control and diabetes management with good safety and efficacy.

关键词： Type-1 diabetes mellitus Teplizumab Anti-CD3 monoclonal antibody Insulin Glycated haemoglobin A1c Cpeptide

Nano-alumina@cellulose-coated separators with the reinforcedconcrete-like structure for high-safety lithium-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第4期68卷 83-93页

作者： Zhihao Yang Li Chen jian xue Miaomiao Su Fangdan Zhang Liangxin Ding Suqing Wang Haihui Wang Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Separators play a critical role in the safety and performance of lithium-ion ***,commercial polyolefin separators are limited by their poor affinity with electrolytes and low melting *** this work,we constructed a reinforced-concrete-like structure by homogeneously dispersing nano-Al_(2)O_(3) and cellulose on the separators to improve their stability and *** this reinforcedconcrete-like structure,the cellulose is a reinforcing mesh,and the nano-Al_(2)O_(3) acts as concrete to support the *** constructing the reinforced-concrete-like structure,the separators exhibit good stability even at 200℃(thermal shrinkage of 0.3%),enhanced tensile strain(tensile stress of 133.4 MPa and tensile strains of 62%),and better electrolyte wettability(a contact angle of 6.5°).Combining these advantages,the cells with nano-Al_(2)O_(3)@cellulose-coated separators exhibit stable cycling performance and good rate ***,the construction of the reinforced-concretelike structure is a promising technology to promote the application of lithium-ion batteries in extreme environments.

关键词： Alumina Nanomaterials Lithium-ion batteries Membranes Cellulose Reinforced-concrete-like structure

Effect of cooling method on TiN precipitation behavior of high-titanium high-strength steel during solidification

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2024年第7期31卷 1692-1703页

作者： xue-jian Zhang Guang-wei Yang Yong Wan Yong-hong Wen Chuan-sheng Tang Ming-qi Liu Li-je Tian Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Anhui University of TechnologyMa'anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Baosteel Central Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

Metallographic microscopy,scanning electron microscopy and TiN growth thermodynamic and kinetic equations were used to investigate the morphology,quantity,and size of TiN in the center of high-titanium high-strength steels under different solidification cooling *** results showed that TiN in the center of the experimental steels mainly existed in three forms:single,composite(Al2O3-TiN),and multi-particle *** began precipitating at around 1497℃(solidification fraction of 0.74).From the end of melting to solidification for 180 s,the cooling rates in the center of the experimental steels for furnace cooling,air cooling,refractory mold cooling,and cast iron mold cooling tended to stabilize at 0.17,0.93,1.65,and 2.15℃/s,*** size of TiN in the center of the experimental steel cooled using furnace cooling was mainly concentrated in the 5-15 pm *** contrast,the size of TiN in the center of the experimental steels cooled using air cooling,refractory mold cooling,and cast iron mold cooling were mainly concentrated in the 1-5 pm *** addition,their density of TiN in the center of the experimental steels is signif-icantly higher than that of the furnace-cooled experimental *** and kinetic precipitation models of TiN established predicted the growth size of TiN in a high-titanium high-strength steel when the solidification cooling rates are not below 0.93℃/s.

关键词： High-titanium steel Cooling method TiN Thermodynamics Kinetics

Pituitary metastasis from lung adenocarcinoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第28期12卷 6155-6158页

作者： xue-jian Wang Department of Neurosurgery Affiliated Hospital 2 of Nantong UniversityNantong 226000Jiangsu ProvinceChina

Pituitary tumor is a common neuroendocrine tumor,but there are also rare clinical metastases at this site,which are generally transferred from extrabellar *** the clinical incidence is low,the prognosis is *** purpose of this editorial is to discuss further the relevant knowledge of pituitary metas-tases and remind clinicians to prevent missed diagnosis and improve the prog-nosis of these patients.

关键词： Editorial Pituitary metastasis Metastatic tumor Diagnosis Treatment Missed diagnosis

Short-term displacement prediction for newly established monitoring slopes based on transfer learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Geology 2024年第2期7卷 351-364页

作者： Yuan Tian Yang-landuo Deng Ming-zhi Zhang Xiao Pang Rui-ping Ma jian-xue Zhang Institute of Remote Sensing and Geographical Information Systems Peking UniversityBeijing 100871China Beijing Key Laboratory of Spatial Information Integration and Its Applications Beijing 100871China Institute of Public Safety Research Department of Engineering PhysicsTsinghua UniversityBeijing 100084China China Institute of Geo-Environment Monitoring Beijing 100081China Technology Innovation Center for Geohazard Monitoring and Risk Early Warning Ministry of Natural ResourcesBeijing 100081China

This study makes a significant progress in addressing the challenges of short-term slope displacement prediction in the Universal Landslide Monitoring Program,an unprecedented disaster mitigation program in China,where lots of newly established monitoring slopes lack sufficient historical deformation data,making it difficult to extract deformation patterns and provide effective predictions which plays a crucial role in the early warning and forecasting of landslide hazards.A slope displacement prediction method based on transfer learning is therefore ***,the method transfers the deformation patterns learned from slopes with relatively rich deformation data by a pre-trained model based on a multi-slope integrated dataset to newly established monitoring slopes with limited or even no useful data,thus enabling rapid and efficient predictions for these ***,as time goes on and monitoring data accumulates,fine-tuning of the pre-trained model for individual slopes can further improve prediction accuracy,enabling continuous optimization of prediction results.A case study indicates that,after being trained on a multi-slope integrated dataset,the TCN-Transformer model can efficiently serve as a pretrained model for displacement prediction at newly established monitoring *** three-day average RMSE is significantly reduced by 34.6%compared to models trained only on individual slope data,and it also successfully predicts the majority of deformation *** fine-tuned model based on accumulated data on the target newly established monitoring slope further reduced the three-day RMSE by 37.2%,demonstrating a considerable predictive *** conclusion,taking advantage of transfer learning,the proposed slope displacement prediction method effectively utilizes the available data,which enables the rapid deployment and continual refinement of displacement predictions on newly established monitoring slopes.

关键词： Landslide Slope displacement prediction Transfer learning Integrated dataset Transformer Pre-trained model Universal Landslide Monitoring Program(ULMP) Geological hazards survey engineering

Self-assembled high-entropy nitride multilayer coating

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2876-2883页

作者： Xiang-Yu Zhang Yan Liu Vasiliy Pelenovich Xiao-Mei Zeng Jie Liu Qiang Wan Alexander Pogrebnjak Long-jian xue Zhi-Wen Chen Yan Lei Bing Yang School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China Hubei JiuFengShan Future Science and Technology Laboratory Wuhan 420000China Institute of Technological Sciences of Wuhan University Wuhan 430072China Hubei Key Laboratory of Electronic Manufacturing and Packaging Integration Wuhan UniversityWuhan 430072China College of Engineering Huazhong Agricultural UniversityWuhan 430070China Sumy State University Sumy 40007Ukraine Institute of Materials Science Slovak University of Technology in BratislavaJána Bottu2591724 TrnavaSlovak Republic Shenzhen Research Institute of Wuhan University Shenzhen 518057China

The development of advanced materials and construction of multilayer structure contribute to enhancing the performance of protective coatings,further improving the industrial productivity and conserving *** this paper,the self-assembled high-entropy nitride(HEN)AlCrNbSiTiN multilayer coating was designed by harnessing the plasma distribution characteristics and depos-ited by arc ion plating using single target.

关键词： coating energy multilayer

基于支持向量回归和分位数的雷达K分布海杂波形状参数估计方法

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2024年第4期46卷 1399-1407页

作者：薛健孙孟玲潘美艳西安邮电大学通信与信息工程学院西安710121 西安电子工程研究所西安710100

针对传统的雷达K分布海杂波形状参数估计方法在异常样本存在情况下估计精度严重下降的问题,该文提出一种基于支持向量回归(SVR)和样本分位数比值的K分布海杂波形状参数估计方法。首先给定K分布杂波参数和分位数位置的值,根据K分布的累... 详细信息

针对传统的雷达K分布海杂波形状参数估计方法在异常样本存在情况下估计精度严重下降的问题,该文提出一种基于支持向量回归(SVR)和样本分位数比值的K分布海杂波形状参数估计方法。首先给定K分布杂波参数和分位数位置的值,根据K分布的累积分布函数计算样本分位数比值及其对数,然后建立以样本分位数比值对数为输入、待估计形状参数为输出的SVR模型,通过交叉验证确定SVR模型的超参数,最后训练SVR模型实现对K分布海杂波形状参数的稳健精确估计。仿真和实测雷达数据表明,所提方法的估计误差低于基于矩的估计方法的估计误差,并且与基于分位数的估计方法具有相近估计性能。此外,相比已有基于分位数的方法,所提方法的超参数容易确定,并且不依赖于查表。

关键词：海杂波 K分布参数估计支持向量回归模型样本分位数

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

结合面部动作单元感知的三维人脸重建算法

软件学报 2024年第5期35卷 2176-2191页

作者：章毅吕嘉仪兰星薛健中国科学院大学工程科学学院北京100049

三维人脸重建在计算机视觉及动画领域是一项重要任务,它可以为人脸多模态应用提供三维模型结构和丰富的语义信息.然而,单目二维人脸图像缺乏深度信息,预测的三维模型参数不够可靠,从而导致重建效果不佳.提出采用与模型参数高度相关的面... 详细信息

三维人脸重建在计算机视觉及动画领域是一项重要任务,它可以为人脸多模态应用提供三维模型结构和丰富的语义信息.然而,单目二维人脸图像缺乏深度信息,预测的三维模型参数不够可靠,从而导致重建效果不佳.提出采用与模型参数高度相关的面部动作单元和人脸关键点作为桥梁,引导模型相关参数回归,以解决单目人脸重建的不适定问题.基于人脸重建的现有数据集,提供一套完整的面部动作单元半自动标注方案,并构建300W-LP-AU数据集.进而提出一种结合动作单元感知的三维人脸重建算法.该算法实现端到端的多任务学习,有效降低了整体训练难度.实验结果表明,该算法能有效地提升三维人脸重建性能,重建的人脸模型具有更高的保真度.

关键词：面部动作单元人脸关键点三维人脸重建