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An adaptive large neighborhood search for the multi-point dynamic aggregation problem

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Control Theory and Technology 2024年第3期22卷 360-378页

作者： Shengyu Lu Bin Xin jie chen Miao Guo School of automation Beijing Institute of TechnologyBeijing 100081China National Key Lab of Autonomous Intelligent Unmanned Systems Beijing 100081China department of Control Science and Engineering Tongji UniversityShanghai 201804China

The multi-point dynamic aggregation(MpDA)problem is a challenging real-world *** the MpDA problem,the demands of tasks keep changing with their inherent incremental rates,while a heterogeneous robot fleet is required to travel between these tasks to change the time-varying state of each *** robots are allowed to collaborate on the same task or work sep.r.tely until all tasks are *** is challenging to generate an effective task execution plan due to the tight coupling between robots abilities and tasks'incremental rates,and the complexity of robot *** effectiveness consideration,we use the variable length encoding to avoid redundancy in the solution *** creatively use the adaptive large neighborhood search(ALNS)framework to solve the MpDA *** the proposed algorithm,high-quality initial solutions are generated through multiple problem-specific solution construction *** heuristics are also used to fix the broken solution in the novel integrated decoding-construction repair process of the ALNS *** results of statistical analysis by the Wilcoxon rank-sum test demonstrate that the proposed ALNS can obtain better task execution plans than some state-of-the-art algorithms in most MpDA instances.

关键词： Adaptive large neighborhood search(ALNS) Multi-point dynamic aggregation(MpDA) Heuristic solution construction Multi-robot collaboration

Timeliness evaluation of task-oriented networked space-based information system

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Journal of Systems Engineering and Electronics 2011年第4期22卷 621-627页

作者： chen chen 1,2,and jie chen 2,3.1.department of automation,{3.,beijing 100084,p.r.China 2.School of automation,beijing Institute of Technology,beijing 100081,p.r.China 3.Complex System Intelligent Control and Decision,Ministry of Education,beijing 100081,p.r.China department of automation Tsinghua University Beijing 100084 P. R. China School of automation Beijing Institute of Technology Beijing 100081 P. R. China School of automation Beijing Institute of Technology Beijing 100081 P. R. China Complex System Intelligent Control and Decision Ministry of Education Beijing 100081 P. R. China

Task-oriented networked information system is an integrated information system which builds on multi-satellite networking to accomplish one or more tasks. In the background of emer- gency relief for applications, system working flow and response process are analyzed, and a timeliness effectiveness evaluation index system is constructed at multi-task level. The effectiveness is a measurement of promptness of information return. In evalua- tion process, system p.r.ormance and tasks are associated, then an evaluation model based on efficacy function is established, and different evaluation criteria are selected for different tasks. A distributed simulation system is constructed, and the execution of task is decomposed. The simulation platform provides a comprehensive data source for evaluation. The results are easy to comp.r. with each other, which reflects system time efficiency in different satellites networks and provides actual systems with basis and reference for design and application.

关键词： timeliness efficacy function space-based informationsystem simulation system.

Noninvasive Diagnostic Technique for Nonalcoholic Fatty Liver Disease Based on Features of Tongue Images

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Chinese Journal of Integrative Medicine 2024年第3期30卷 203-212页

作者： WANG rong-rui chen Jia-liang DUAN Shao-jie LU Ying-xi chen ping ZHOU Yuan-chen YAO Shu-kun Graduate School of beijing university of Chinese Medicine Beijing100029China department of Gastroenterology China-Japan Friendship HospitalBeijing100029China Center of Integrative Medicine Beijing Ditan HospitalCapital Medical UniversityBeijing100015China Nanjing Linkwah Micro-electronics Institute Beijing100191China Institute of Microelectronics Tsinghua UniversityBeijing100084China peking university China-Japan Friendship School of Clinical Medicine Beijing100029China

Objective:To investigate a new noninvasive diagnostic model for nonalcoholic fatty liver disease(NAFLD) based on features of tongue ***:Healthy controls and volunteers confirmed to have NAFLD by liver ultrasound were recruited from China-Japan Friendship Hospital between September 2018 and May 2019,then the anthropometric indexes and sampled tongue images were *** tongue images were labeled by features,based on a brief protocol,without knowing any other clinical data,after a series of corrections and data *** algorithm was trained on images using labels and several anthropometric indexes for inputs,utilizing machine learning ***,a logistic regression algorithm and a decision tree model were constructed as 2 diagnostic models for ***:A total of 720 subjects were enrolled in this study,including 43. patients with NAFLD and 288 healthy *** them,482 were randomly allocated into the training set and 23. into the validation *** diagnostic model based on logistic regression exhibited excellent p.r.ormance:in validation set,it achieved an accuracy of 86.98%,sensitivity of 91.43.,and specificity of 80.61%;with an area under the curve(AUC) of 0.93.[95% confidence interval(CI) 0.68–0.98].The decision tree model achieved an accuracy of 81.09%,sensitivity of 91.43.,and specificity of 66.3.%;with an AUC of 0.89(95% CI 0.66–0.92) in validation ***:The features of tongue images were associated with *** the 2 diagnostic models,which would be convenient,noninvasive,lightweight,rapid,and inexpensive technical references for early screening,can accurately distinguish NAFLD and are worth further study.

关键词： nonalcoholic fatty liver disease noninvasive diagnosis tongue image tongue diagnosis Chinese medicine machine learning

Learning Scalable Task Assignment with Imp.r.tive-priori Conflict resolution in Multi-UAV Adversarial Swarm Defense problem

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Journal of Systems Science & Complexity 2024年第1期37卷 369-388页

作者： ZHAO Zhixin chen jie XIN Bin LI Li JIAO Keming ZHENG Yifan School of Electronics and Information Engineering Tongji UniversityShanghai 201804China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 201804China School of automation Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing 100081China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 201804China.

The multi-UAV adversary swarm defense(MUASD)problem is to defend a static base against an adversary UAV swarm by a defensive UAV *** the problem into task assignment and low-level interception strategies is a widely used ***-based ap.r.aches for task assignment are a promising *** studies on learning-based methods generally assume decentralized decision-making architecture,which is not beneficial for conflict *** contrast,centralized decision-making architecture is beneficial for conflict resolution while it is often detrimental to *** achieve scalability and conflict resolution simultaneously,insp.r.d by a self-attention-based task assignment method for sensor target coverage problem,a scalable centralized assignment method based on self-attention mechanism together with a defender-attacker pairwise observation preprocessing(DAp-SelfAtt)is ***,an imp.r.tive-priori conflict resolution(Ip.r.mechanism is proposed to achieve conflict-free ***,the Ip.r.mechanism is p.r.llelized to enable efficient *** validate the algorithm,a variant of proximal policy optimization algorithm(ppO)is employed for training in scenarios of various *** exp.r.mental results show that the proposed algorithm not only achieves conflict-free task assignment but also maintains scalability,and significantly improve the success rate of defense.

关键词： Conflict resolution reinforcement learning scalability task assignment.

Single cell analysis unveils B cell-dominated immune subtypes in HNSCC for enhanced prognostic and therapeutic stratification

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International Journal of Oral Science 2024年第3期16卷 448-459页

作者： Kang Li Caihua Zhang ruoxing Zhou Maosheng cheng rongsong Ling Gan Xiong jieyi Ma Yan Zhu Shuang chen jie chen Demeng chen Liang peng State Key Laboratory of Oncology in South China Department of Oral and Maxillofacial SurgeryInstitute of Precision MedicineCenter for Translational MedicineThe First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouChina Institute for Advanced Study Shenzhen UniversityShenzhenChina Hospital of Stomatology Guangdong Provincial Key Laboratory of StomatologyGuanghua School of StomatologySun Yat-Sen UniversityGuangzhouChina Senior department of Oncology The Fifth Medical Center of PLA General HospitalBeijingChina

Head and neck squamous cell carcinoma(HNSCC)is characterized by high recurrence or distant metastases rate and the prognosis is *** is mounting evidence that tumor-infiltrating B cells(TIL-Bs)have a crucial,synergistic role in tumor ***,little is known about the role TIL-Bs play in immune microenvironment and the way TIL-Bs affect the outcome of immune checkpoint *** single-cell rNA sequencing(scrNA-seq)data from the Gene Expression Omnibus(GEO)database,the study identified distinct gene expression patterns in *** samples were categorized into TIL-Bs inhibition and TIL-Bs activation groups using unsup.r.ised *** classification was further validated with TCGA HNSCC data,correlating with patient prognosis,immune cell infiltration,and response to *** found that the B cells activation group exhibited a better prognosis,higher immune cell infiltration,and distinct immune checkpoint levels,including elevated pD-L1.A prognostic model was also developed and validated,highlighting four genes as potential biomarkers for predicting survival outcomes in HNSCC ***,this study provides a foundational ap.r.ach for B cells-based tumor classification in HNSCC,offering insights into targeted treatment and immunotherapy strategies.

关键词： prognosis elevated offering

A Matching Algorithm with reinforcement Learning and Decoupling Strategy for Order Dispatching in On-Demand Food Delivery

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tsinghua Science and Technology 2024年第2期29卷 386-399页

作者： Jingfang chen Ling Wang Zixiao pan Yuting Wu jie Zheng Xuetao Ding department of automation Tsinghua UniversityBeijing 100084China department of Delivery Technology MeituanBeijing 100102China

The on-demand food delivery(OFD)service has gained rapid development in the past decades but meanwhile encounters challenges for further improving op.r.tion *** order dispatching problem is one of the most concerning issues for the OFD platforms,which refer to dynamically dispatching a large number of orders to riders reasonably in very limited decision *** solve such a challenging combinatorial optimization problem,an effective matching algorithm is proposed by fusing the reinforcement learning technique and the optimization ***,to deal with the large-scale complexity,a decoupling method is designed by reducing the matching space between new orders and ***,to overcome the high dynamism and satisfy the stringent requirements on decision time,a reinforcement learning based dispatching heuristic is *** be specific,a sequence-to-sequence neural network is constructed based on the problem characteristic to generate an order priority ***,a training ap.r.ach is specially designed to improve learning ***,a greedy heuristic is employed to effectively dispatch new orders according to the order priority *** real-world datasets,numerical exp.r.ments are conducted to validate the effectiveness of the proposed *** results show that the proposed algorithm can effectively solve the problem by improving delivery efficiency and maintaining customer satisfaction.

关键词： order dispatching on-demand delivery reinforcement learning decoupling strategy sequence-to-sequence neural network

Numerical modeling of all-day albedo variation for bifacial pV systems on rooftops and annual yield prediction in beijing

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Building Simulation 2024年第6期17卷 955-964页

作者： Xiaoxiao Su chenglong Luo Xinzhu chen jie Ji Yanshun Yu Yuandan Wu Wu Zou School of Energy and power Engineering Nanjing University of Science and TechnologyNanjing210094China department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei230027China Institute of Energy research Jiangxi Academy of SciencesNanchang330096China

Bifacial pV modules capture solar radiation from both sides,enhancing power generation by utilizing reflected ***,there are difficulties in obtaining ground albedo data due to its dynamic *** address this issue,this study established an exp.r.mental testing system on a rooftop and developed a model to analyze dynamic albedo variations,utilizing specific data from the *** results showed that the all-day dynamic variations in ground albedo ranged from 0.15 to 0.22 with an average of ***,this study evaluates the annual p.r.ormance of a bifacial pV system in beijing by considering the exp.r.mental conditions,utilizing bifacial modules with a front-side efficiency of 21.23.and a bifaciality factor of 0.8,and analyzing the dynamic all-day albedo data obtained from the numerical *** results indicate that the annual radiation on the rear side of bifacial pV modules is 278.90 kWh/m^(2),which accounts for only 15.50%of the front-side ***,when using the commonly default albedo value of 0.2,the rear-side radiation is 3.3.01 kWh/m^(2),resulting in an overestimation of 19.40%.Under dynamic albedo conditions,the bifacial system is predicted to generate an annual power output of 412.55 kWh/m^(2),representing a significant increase of ap.r.ximately 12.3.%comp.r.d to an idealized monofacial pV system with equivalent front-side *** a 25-year lifespan,the bifacial pV system is estimated to reduce carbon emissions by 83.3.91 kgCO_(2)/m^(2),providing an additional reduction of 924.3. kgCO_(2)/m^(2)comp.r.d to the idealized monofacial pV *** findings offer valuable insights to promote the application of bifacial pV modules.

关键词： bifacial pV module ground albedo simulation carbon emission reduction

Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 703-712页

作者： Yan-Hui Wang Hua-Qiang Sun Wen-Jing Feng Lei-jie Zhao Xiang chen Qing-An chen Hai-Tao Sun Jian-Jun Wang Zhi-Nan Yang Key Laboratory of Intelligent Industrial Equipment Technology of Hebei province School of Mechanical and Equipment EngineeringHebei University of EngineeringHandan056038China Collaborative Innovation Center for Modern Equipment Manufacturing of Jinan New Area Hebei University of EngineeringHandan056038China School of Materials Science and Engineering Tsinghua UniversityBeijing100084China Avic Shang da Sup.r.lloys Company Limited Xingtai054800China National Engineering research Center for Equipment and Technology of Cold Strip.r.lling Yanshan UniversityQinhuangdao066004China

In this study, a high-carbon nano-bainitic GCr15Si1Mo bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austemp.r.ng at low temp.r.tures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (rA) was obtained in GCr15SiMo steel. When the exp.r.mental steel was austenitized at 900 ℃, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austemp.r.ng temp.r.ture, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.

关键词： Nano-bainite Undissolved carbides Bainitic transformation kinetics Carbon concentration

circrNAs deregulation in exosomes derived from BEAS-2B cells is associated with vascular stiffness induced by pM_(2.5)

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Journal of Environmental Sciences 2024年第3期137卷 527-539页

作者： Qingping Liu Yaling Zhang Bin Han Mengruo Wang Huaifang Hu jie Ning Wentao Hu Meiyu chen Yaxian pang Yuanyuan chen Lei Bao Yujie Niu rong Zhang department of Toxicology Hebei Medical UniversityShijiazhuang 050017China State Key Laboratory of Environment Health(Incubation) Key Laboratory of Environment and HealthMinistry of EducationKey Laboratory of Environment and Health(Wuhan)Ministry of Environmental ProtectionSchool of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China China CDC Key Laboratory of Environment and population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China Occupational Health and Environmental Health Hebei Medical UniversityShijiazhuang 050017China Hebei Key Laboratory of Environment and Human Health Hebei Medical UniversityShijiazhuang 050017China

As an environmental pollutant,ambient fine p.r.iculate matter (pM_(2.5)) was linked to cardiovascular *** molecular mechanisms underlying pM_(2.5)-induced extrapulmonary disease has not been elucidated *** this study the ambient pM_(2.5)exposure mice model we established was to explore adverse effects of vessel and potential ***-term pM_(2.5)exposure caused reduced lung function and vascular stiffness in *** chronic pM_(2.5)induced migration and epithelial-mesenchymal transition (EMT) phenotype in BEAS-2B *** pM_(2.5)treatment,the circrNAs and mrNAs levels of exosomes released by BEAS-2B cells were detected by competing endogenous rNA (cerNA) array,which contained 1664 differentially expressed circrNAs (DE-circrNAs) and 3.8 differentially expressed m rNAs (DE-mrNAs).By bioinformatics analysis on host genes of DE-circrNAs,vascular diseases and some pathways related to vascular diseases including focal adhesion,tight junction and adherens junction were ***,cerNA network was constructed,and DE-mrNAs in cerNA network were conducted functional enrichment analysis by Ingenuity pathway Analysis,which indicated that hsa_circ_0012627,hsa_circ_0053.61and hsa_circ_0052810 were related to vascular endothelial ***,it was verified exp.r.mentally that Exo^(pM2.5)could induce endothelial dysfunction by increased endothelial p.r.eability and decreased relaxation in *** present study,we investigated in-depth knowledge into the molecule events related to pM_(2.5) toxicity and pathogenesis of vascular diseases.

关键词： Fine p.r.iculate matter Vascular stiffness Exosome cerNA microarray Endothelial dysfunction