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Two-Way Neural Network Performance PredictionModel Based onKnowledge Evolution and Individual Similarity

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1183-1206页

作者： Xinzheng Wang Bing Guo Yan Shen College of Computer Science Sichuan UniversityChengdu610065China School of Information Science and Engineering Guilin University of TechnologyGuilin541004China School of Control Engineering Chengdu University of Information TechnologyChengdu610225China

Predicting students’academic achievements is an essential issue in education,which can benefit many stakeholders,for instance,students,teachers,managers,etc.Compared with online courses such asMOOCs,students’academicrelateddata in the face-to-face physical teaching environment is usually sparsity,and the sample size is relativelysmall.It makes building models to predict students’performance accurately in such an environment even morechallenging.This paper proposes a Two-WayNeuralNetwork(TWNN)model based on the bidirectional recurrentneural network and graph neural network to predict students’next semester’s course performance using only theirprevious course achievements.Extensive experiments on a real dataset show that our model performs better thanthe baselines in many indicators.

关键词： Computer education performance prediction deep learning

For Mega-Constellations: Edge Computing and Safety Management Based on Blockchain Technology

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China Communications 2024年第2期21卷 59-73页

作者： Zhen Zhang Bing Guo Chengjie Li College of Computer Science Sichuan UniversityChengdu 610064China The Key Laboratory for Computer Systems of State Ethnic Affairs Commission School of Computer Science and TechnologySouthwest Minzu UniversityChengdu 610225China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China

In mega-constellation Communication Systems, efficient routing algorithms and data transmission technologies are employed to ensure fast and reliable data transfer. However, the limited computational resources of satellites necessitate the use of edge computing to enhance secure communication.While edge computing reduces the burden on cloud computing, it introduces security and reliability challenges in open satellite communication channels. To address these challenges, we propose a blockchain architecture specifically designed for edge computing in mega-constellation communication systems. This architecture narrows down the consensus scope of the blockchain to meet the requirements of edge computing while ensuring comprehensive log storage across the network. Additionally, we introduce a reputation management mechanism for nodes within the blockchain, evaluating their trustworthiness, workload, and efficiency. Nodes with higher reputation scores are selected to participate in tasks and are appropriately incentivized. Simulation results demonstrate that our approach achieves a task result reliability of 95% while improving computational speed.

关键词： blockchain consensus mechanism edge computing mega-constellation reputation management

A Public Blockchain Consensus Mechanism for Fault-Tolerant Distributed Computing in LEO Satellite Communications

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China Communications 2022年第7期19卷 110-123页

作者： Zhen Zhang Bing Guo Lidong Zhu Yan Shen Chaoxia Qin Chengjie Li College of Computer Science Sichuan UniversityChengdu 610065China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 610000China School of Computer Science Chengdu University of Information TechnologyChengdu 610225China School of Computer Science and Technology Southwest Minzu UniversityChengdu 610225China

In LEO(Low Earth Orbit)satellite communication systems,the satellite network is made up of a large number of satellites,the dynamically changing network environment affects the results of distributed computing.In order to improve the fault tolerance rate,a novel public blockchain consensus mechanism that applies a distributed computing architecture in a public network is proposed.Redundant calculation of blockchain ensures the credibility of the results;and the transactions with calculation results of a task are stored distributed in sequence in Directed Acyclic Graphs(DAG).The transactions issued by nodes are connected to form a net.The net can quickly provide node reputation evaluation that does not rely on third parties.Simulations show that our proposed blockchain has the following advantages:1.The task processing speed of the blockchain can be close to that of the fastest node in the entire blockchain;2.When the tasks’arrival time intervals and demanded working nodes(WNs)meet certain conditions,the network can tolerate more than 50%of malicious devices;3.No matter the number of nodes in the blockchain is increased or reduced,the network can keep robustness by adjusting the task’s arrival time interval and demanded WNs.

关键词： distributed computing public blockchain network consensus mechanism credibility faulttolerance

Noninvasive Manipulation of Ion Channels for Neuromodulation and Theranostics

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Accounts of Materials Research 2022年第2期3卷 247-258页

作者： Yuxia Liu Zhigao Yi Yun Yao Bing Guo Xiaogang Liu Department of Chemistry National University of SingaporeSingapore 117543Singapore The N.1 Institute for Health National University of SingaporeSingapore 117456Singapore Department of Neurobiology Peking UniversityBeijing 100191P.R.China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055P.R.China

CONSPECTUS:Functional and structural studies of ion channels have deepened our understanding of their mechanisms and important role in regulating neuronal activity and treating disease.Manipulation of ion channels can directly control electrochemical signals in the nervous and cardiovascular systems for advanced neuromodulation and theranostics.Manipulation tools based on ion channel control,such as optogenetics,electrical stimulation,chemogenetics,and gene editing,have advanced basic biomedical research and enabled unprecedented treatment strategies.Nevertheless,conventional approaches are associated with limitations such as invasiveness,irreversibility,or low spatiotemporal resolution,which limit their clinical application.Therefore,targeted noninvasive or minimally invasive modulation of various ion channel activities is highly desirable.

关键词： limitations limit desirable

Tuning sodium wettability and pore tortuosity for superior sodium storage

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Rare Metals 2023年第12期42卷 4048-4059页

作者： Yao-Yao Xiao Yi-Hui Liu bing-bing Liu Zhen-guo Qi You-Bin Zhang Fu-Sheng Liu guo-Hui Qin State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Synergetic Innovation Center of Ecological and Chemical Engineering Qingdao 266042China

Abundant FeS2 with high theoretical capacity is one of the promising anode candidates in sodium-ion batteries(SlBs),however,the uneven sodium deposition due to the poor interface compatibility and sluggish reaction kinetics because of the high activation barrier still plague its practical application.Herein,we synthesized the ordered porous carbon matrix wrapped FeS2 nanoparticles(FeS_2@OCN)with high sodium wettability and low pore tortuosity to economically enhance the interface compatibility as well as to lower the energy barrier in SIBs.The synergistic effects of low tortuosity pores and strong sodium wettability homogenize the Na+flux distribution,bring the electron dislocation via the enrichment of edgenitrogen(Pyridinic N and Pyrrolic N),thus achieving the dendrite-free sodium deposition and dramatically enhanced reaction kinetics.Benefiting from exceptional structural/compositional/electronic merits,the resultant anode is endowed with exceptional structure stability,achieving long-term cycling stability of 451.9 mAh·g^(-1)after 1000cycles at 1 A·g^(-1)with specific capacity retention of 92.9%.Attenuated electrode tortuosity and high sodium wettability can corporately improve the interface compatibility and attenuate the activation barrier of the FeS_2 host and beyond.

关键词： FeS_2 Wettability Sodium capture Low tortuosity Charge transport

A Practical Approach for Missing Wireless Sensor Networks Data Recovery

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China Communications 2024年第5期21卷 202-217页

作者： Song Xiaoxiang guo Yan Li Ning Ren bing The College of Communications Engineering Army Engineering University of PLANanjing 210007China The 63891 Unit of PLA Luoyang 471000China

In wireless sensor networks(WSNs),the performance of related applications is highly dependent on the quality of data collected.Unfortunately,missing data is almost inevitable in the process of data acquisition and transmission.Existing methods often rely on prior information such as low-rank characteristics or spatiotemporal correlation when recovering missing WSNs data.However,in realistic application scenarios,it is very difficult to obtain these prior information from incomplete data sets.Therefore,we aim to recover the missing WSNs data effectively while getting rid of the perplexity of prior information.By designing the corresponding measurement matrix that can capture the position of missing data and sparse representation matrix,a compressive sensing(CS)based missing data recovery model is established.Then,we design a comparison standard to select the best sparse representation basis and introduce average cross-correlation to examine the rationality of the established model.Furthermore,an improved fast matching pursuit algorithm is proposed to solve the model.Simulation results show that the proposed method can effectively recover the missing WSNs data.

关键词： average cross correlation matching pursuit missing data wireless sensor networks

Computational fluid dynamics simulation of aerosol transport and deposition

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 362-377页

作者： Yingjie TANG Bing Guo Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA

In this article computational fluid dynamics(CFD)simulation of aerosol transport and deposition,i.***.the transport and deposition of particles in an aerosol,is reviewed.The review gives a brief account of the basics of aerosol mechanics,followed by a description of the general CFD approach for flow field simulation,turbulence modeling,wall treatments and simulation of particle motion and deposition.Then examples from the literature are presented,including CFD simulation of particle deposition in human respiratory tract and particle deposition in aerosol devices.CFD simulation of particle transport and deposition may provide information that is difficult to obtain through physical experiments,and it may help reduce the number of experiments needed for device design.Due to the difficulty of describing turbulent flow and particle-eddy interaction,turbulent dispersion of particles remains one of the greatest challenges for CFD simulation.However,it is possible to take a balanced approach toward quantitative description of aerosol dispersion using CFD simulation in conjunction with empirical relations.

关键词： computational fluid dynamics(CFD) aerosol transport deposition

Response functions of a 4π summing gamma detector in β-Oslo method

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Nuclear Science and Techniques 2022年第6期33卷 9-17页

作者： guo-Chun Yang Lei-Ming Hua Fei Lu Jun Su Zhi-Hong Li Shi-Lun Jin Yang-Ping Shen Bing Guo Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The response functions of a 4π summing BGO detector were established using extensive experimental measurements and GEANT4 simulation. The partial and total efficiencies for all components of the γ-ray interaction with the BGO detector were also measured. These response functions and efficiencies will be used in the β-Oslo method experiments to study the neutron capture cross sections of radioactive heavy ions. The application of the response functions of the BGO detector under simulated continuum γ-rays and source measurement γ-rays proves that the method and response functions are reliable.

关键词： 4πSumming BGO detector γ-Ray spectrum Energy resolutions GEANT4 simulation

PLEK2 promotes cancer stemness and tumorigenesis of head and neck squamous cell carcinoma via the c-Myc-mediated positive feedback loop

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Cancer Communications 2022年第10期42卷 987-1007页

作者： Xinyuan Zhao Dalong Shu Wenjuan Sun Shanshan Si Wei Ran Bing Guo Li Cui Department of Endodontics Stomatological HospitalSouthern Medical UniversityGuangzhouGuangdong 510280P.R.China Department of Oral and Maxillofacial Surgery The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080P.R.China Department of Stomatology The Third Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510630P.R.China Department of Oral Emergency Stomatological HospitalSouthern Medical UniversityGuangzhouGuangdong 510280P.R.China Department of Dentistry The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080P.R.China Department of Oral and Maxillofacial Surgery Stomatological HospitalSouthern Medical UniversityGuangzhouGuangdong 510280P.R.China Division of Oral Biology and Medicine School of DentistryUniversity of CaliforniaLos AngelesLos AngelesCalifornia 90095United States

Background:Head and neck squamous cell carcinoma(HNSCC)is one of the most frequent malignancies worldwide and is characterized by unfavorable prognosis,high lymph node metastasis and early recurrence.However,the molecular events regulating HNSCC tumorigenesis remain poorly understood.Therefore,uncovering the underlying mechanisms is urgently needed to identify novel and promising therapeutic targets for HNSCC.In this study,we aimed to explore the role of pleckstrin-2(PLEK2)in regulating HNSCC tumorigenesis.Methods:The expression pattern of PLEK2 and its clinical significance in HNSCC were determined by analyzing publicly assessable datasets and our own independent HNSCC cohort.In vitro and in vivo experiments,including cell proliferation,colony formation,Matrigel invasion,tumor sphere formation,ALDEFLUOR,Western blotting assays and xenograft mouse models,were used to investigate the role of PLEK2 in regulating the malignant behaviors of HNSCC cells.The underlying molecular mechanisms for the tumor-promoting role of PLEK2 were elucidated using co-immunoprecipitation,cycloheximide chase analysis,ubiquitination assays,chromatin immunoprecipitation-quantitative polymerase chain reaction,luciferase reporter assays and rescue experiments.Results:The expression levels of PLEK2 mRNA and protein were significantly increased in HNSCC tissues,and PLEK2 overexpression was strongly associated with poor overall survival and therapeutic resistance.Additionally,PLEK2 was important for maintaining the proliferation,invasion,epithelial-mesenchymal transition,cancer stemness and tumorigenesis of HNSCC cells and could alter the cellular metabolism of the cancer cells.Mechanistically,PLEK2 interacted with c-Myc and reduced the association of F-box and WD repeat domain containing 7(FBXW7)with c-Myc,thereby avoiding ubiquitination and subsequent proteasome-mediated degradation of c-Myc.Moreover,the c-Myc signaling activated by PLEK2 was important for sustaining the aggressive malignant phenotypes and tumorigenesis of HNSCC cells.c-M

关键词： c-Myc cancer stemness FBXW7 HNSCC PLEK2 positive feedback loop tumorigenesis ubiquitination-mediated degradation