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Explainable Business Process Remaining Time Prediction Using Reachability Graph

Chinese Journal of Electronics 2023年第3期32卷 625-639页

作者： CAO Rui ZENG Qingtian NI Weijian LU Faming LIU Cong DUAN Hua College of Computer Science and Engineering Shandong University of Science and Technology School of Computer Science and Technology Shandong University of Technology

With the recent advances in the field of deep learning, an increasing number of deep neural networks have been applied to business process prediction tasks, remaining time prediction, to obtain more accurate predictive results. However, existing time prediction methods based on deep learning have poor interpretability, an explainable business process remaining time prediction method is proposed using reachability graph,which consists of prediction model construction and visualization. For prediction models, a Petri net is mined and the reachability graph is constructed to obtain the transition occurrence vector. Then, prefixes and corresponding suffixes are generated to cluster into different transition partitions according to transition occurrence vector. Next,the bidirectional recurrent neural network with attention is applied to each transition partition to encode the prefixes, and the deep transfer learning between different transition partitions is performed. For the visualization of prediction models, the evaluation values are added to the sub-processes of a Petri net to realize the visualization of the prediction models. Finally, the proposed method is validated by publicly available event logs.

关键词： Deep learning Training Visualization Recurrent neural networks Petri nets Transfer learning Process control

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Event-based nonsingular fixed-time containment control for nonlinear multiagent systems with dynamic uncertainties

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science China(Information sciences) 2025年第5期68卷 413-414页

作者： Yuanbo SU Qihe SHAN Tieshan LI C.L.Philip CHEN Navigation College Dalian Maritime University School of Automation Engineering University of Electronic Science and Technology of China School of Computer Science and Engineering South China University of Technology

Owing to the extensive applications in many areas such as networked systems,formation flying of unmanned air vehicles,and coordinated manipulation of multiple robots,the distributed containment control for nonlinear multiagent systems (MASs) has received considerable attention,for example [1,2].Although the valued studies in [1,2] investigate containment control problems for MASs subject to nonlinearities,the proposed distributed nonlinear protocols only achieve the asymptotic *** a crucial performance indicator for distributed containment control of MASs,the fast convergence is conducive to achieving better control accuracy [3].The work in [4] first addresses the backstepping-based adaptive fuzzy fixed-time containment tracking problem for nonlinear high-order MASs with unknown external ***,the designed fixedtime control protocol [4] cannot escape the singularity problem in the backstepping-based adaptive control *** is well known,the singularity problem has become an inherent problem in the adaptive fixed-time control design,which may cause the unbounded control inputs and even the instability of controlled ***,how to solve the nonsingular fixed-time containment control problem for nonlinear MASs is still open and awaits breakthrough to the best of our knowledge.

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Bifurcation analysis and control study of improved full-speed differential model in connected vehicle environment

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Chinese Physics B 2024年第7期33卷 245-266页

作者：艾文欢雷正清李丹洋方栋梁刘大为 College of Computer Science and Engineering Northwest Normal UniversityLanzhou 730070China College of Electrical Engineering Lanzhou Institute of TechnologyLanzhou 730050China

In recent years, the traffic congestion problem has become more and more serious, and the research on traffic system control has become a new hot spot. Studying the bifurcation characteristics of traffic flow systems and designing control schemes for unstable pivots can alleviate the traffic congestion problem from a new perspective. In this work, the full-speed differential model considering the vehicle network environment is improved in order to adjust the traffic flow from the perspective of bifurcation control, the existence conditions of Hopf bifurcation and saddle-node bifurcation in the model are proved theoretically, and the stability mutation point for the stability of the transportation system is found. For the unstable bifurcation point, a nonlinear system feedback controller is designed by using Chebyshev polynomial approximation and stochastic feedback control method. The advancement, postponement, and elimination of Hopf bifurcation are achieved without changing the system equilibrium point, and the mutation behavior of the transportation system is controlled so as to alleviate the traffic congestion. The changes in the stability of complex traffic systems are explained through the bifurcation analysis, which can better capture the characteristics of the traffic flow. By adjusting the control parameters in the feedback controllers, the influence of the boundary conditions on the stability of the traffic system is adequately described, and the effects of the unstable focuses and saddle points on the system are suppressed to slow down the traffic flow. In addition, the unstable bifurcation points can be eliminated and the Hopf bifurcation can be controlled to advance, delay, and disappear,so as to realize the control of the stability behavior of the traffic system, which can help to alleviate the traffic congestion and describe the actual traffic phenomena as well.

关键词： bifurcation analysis vehicle queuing bifurcation control Hopf bifurcation

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Assessing GNSS hydrological monitoring capability across different climatic settings in China

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Geodesy and Geodynamics 2025年第2期16卷 147-157页

作者： Qingwen Huang Lilong Liu Chaolong Yao Si Xiong Liangke Huang Tengxu Zhang College of Geomatics and Geoinformation Guilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Spatial Information and Geomatics Guilin 541004China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510640China National Precise Gravity Measurement Facility Huazhong University of Science and TechnologyWuhan 430074China School of Resources and Environment Science and Engineering Hubei University of Science and TechnologyXianning 437100China

Vertical position changes of ground-based Global Navigation Satellite System(GNsS)stations have been used to study regional terrestrial water storage(TwS)***,the feasibility is still unclear in many areas due to diverse local *** study aims to evaluate the capability of GNsS vertical displacements in monitoring hydrological variations in four climate settings over Chinese *** spatial and temporal variations of hydrological load-induced(HYDL)vertical displacements at 208 GNSS sites during 2011-2020 were analyzed by comparing with Gravity Recovery and Climate Experiment(GRACE)/GRACE Follow-On(GFO)and Global Land Data Assimilation System(GLDAS)derived TWS *** results indicate that GNsS vertical positions show different capabilities in capturing seasonal and non-seasonal hydrological dynamics in different climate *** the four climatic settings,the subtropical monsoon climate(SMC)region,with the largest deformation fluctuation(the regional mean root mean square(RMS)is 7.97 mm),has the highest regional mean HYDL-GRACE and HYDL-GLDAS anti-correlation coefficients(CCs)of-0.47 and-0.45 at the seasonal scale,*** the individual GNSS site,the number of the sites with CC<-0.4O between HYDL and GRACE/GLDASderived TWS changes accounts for 55.1%and 55.1%(SMC),13.0%and 7.4%(temperate monsoon climate,TMC),6.7%and 13.3%(temperate continental climate,TCC),32.3%and 38.7%(plateau climate,PC),*** the non-seasonal term,although the proportion with CC<-0.40 in each climate type decreases mainly due to the influence of local geodynamic and human activities,especially in the SMC and PC regions,GNSS site vertical deformations still show good capability in monitoring hydrological *** results provide valuable information for better application of GNSS to hydrology.

关键词： GNSS vertical displacement Hydrological loading GRACE GLDAS Climate setting

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Harmless Impact of Electrolytic Manganese Residue by Low Temperature Thermochemical Method with Carbide Slag

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Journal of Wuhan university of technology(Materials science) 2025年第2期40卷 400-411页

作者： XIE Zhihan LIU Rongjin LU Fuhua JING Daiyan ZHAO Yanrong LIANG Jianbo HUANG Wanyu CHEN Tingchao College of Material Science and Engineering Guilin University of TechnologyGuilin 541004China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi Guilin University of TechnologyGuilin 541004China Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of EducationGuilin University of TechnologyGuilin 541004China Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials Guilin 541004China

This study introduced a low-temperature thermochemical method for the treatment of EMR in the presence of carbide slag(CS)to achieve an economical and efficient harmless *** experimental results indicate that,under suitable conditions,the NH_(4)^(+)and Mn^(2+)contents in EMR decrease notably with the increasing CS content,accompanied by an increase in pH ***,the concentration of NH_(4)^(+)in EMR considerably decreases with the increasing liquid-to-solid ratio,eventually ***,the pH value first increases and then decreases,ultimately *** a CS content of 12%and a liquid-to-solid ratio of 0.7,the leaching concentrations of NH_(4)^(+)and Mn^(2+)in EMR(127.7 mg/kg and 0.15 mg/L,respectively)fall below the standard detection limit(2 mg/L),with the pH measuring 8.26,meeting the conditions outlined in the GB ***_(4)^(+)is converted to NH_(3),while Mn^(2+)is transformed into solid precipitates such as Mn(OH)_(2),Mn_(2)O_(3),MnO_(2),Ca_(3)Mn_(2)O_(7),and Ca_(2)MnO_(4).The majority of manganese ions exist in trivalent or tetravalent states and remain stable over *** cost of using CS as a reagent for treating 1 ton of EMR is merely$*** high OH^(-)concentration provided by CS enables the effective removal of NH_(4)^(+)from EMR and the solidification of Mn^(2+)during thermal reactions.

关键词： low-temperature thermochemistry electrolytic manganese residue carbide slag harmless treatment soluble manganese ammonium ion

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Ultra-Narrowband Circular Dichroism Induced by Chiral Quasi-Bound States in All-Silicon Dielectrics in the Terahertz Range 12

Ultra-Narrowband Circular Dichroism Induced by Chiral Quasi-...

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12th IEEE International Conference on Information and Communication Networks, ICICN 2024

作者： Sun, Hongrui Yang, Yuhang Yang, Hongyan He, Quanlin Yu, Fangzhou Zhi, Wenlong Li, Jianqing School of Optoelectronic Engineering Guilin University of Electronic Technology Guilin China School of Computer Science and Engineering Macau University of Science and Technology China

ISBN: (纸本)9798350355802

Circular dichroism has extensive applications in fields such as ultra-sensitive biosensing and wavefront manipulation within chiral structures. However, traditional terahertz chiral structures face challenges in effectively addressing narrowband issues due to linewidth limitations. Recently, the introduction of the concept of quasi-bound states in the continuum (quasi-BIC) in optical resonant systems has demonstrated extremely high quality factors and very low radiation losses, providing a theoretical foundation for achieving ultra-narrow linewidth wave control. In this study, we innovatively construct bound states in the continuum (BIC) in a planar all-silicon terahertz metasurface with in-plane C2 symmetry and broken mirror symmetry. This system not only exhibits symmetry-protected BICs but also reveals parameter-tuned BICs. Through methods such as band structure calculations and far-field polarization analysis, we achieve an ultra-narrow linewidth with an extremely high quality factor at the quasi-BIC frequency, successfully realizing ultra-narrowband terahertz chirality. Our findings provide a novel solution for terahertz narrowband chirality and spin-selective asymmetric transport, potentially driving technological advancements in related fields. © 2024 IEEE.

关键词： Dichroism

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Adversarial attacks and defenses for digital communication signals identification

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Digital Communications and Networks 2024年第3期10卷 756-764页

作者： Qiao Tian Sicheng Zhang Shiwen Mao Yun Lin College of Computer Science and Technology Harbin Engineering UniversityHarbin150001China College of Information and Communication Engineering Harbin Engineering UniversityHarbin150000China Department of Electrical and Computer Engineering Auburn UniversityAuburnAL36849USA

As modern communication technology advances apace,the digital communication signals identification plays an important role in cognitive radio networks,the communication monitoring and management *** has become a promising solution to this problem due to its powerful modeling capability,which has become a consensus in academia and ***,because of the data-dependence and inexplicability of AI models and the openness of electromagnetic space,the physical layer digital communication signals identification model is threatened by adversarial *** examples pose a common threat to AI models,where well-designed and slight perturbations added to input data can cause wrong ***,the security of AI models for the digital communication signals identification is the premise of its efficient and credible *** this paper,we first launch adversarial attacks on the end-to-end AI model for automatic modulation classifi-cation,and then we explain and present three defense mechanisms based on the adversarial *** we present more detailed adversarial indicators to evaluate attack and defense ***,a demonstration verification system is developed to show that the adversarial attack is a real threat to the digital communication signals identification model,which should be paid more attention in future research.

关键词： Digital communication signals identification AI model Adversarial attacks Adversarial defenses Adversarial indicators

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AsyCo: an asymmetric dual-task co-training model for partial-label learning

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science China(Information sciences) 2025年第5期68卷 332-347页

作者： Beibei LI Yiyuan ZHENG Beihong JIN Tao XIANG Haobo WANG Lei FENG College of Computer Science Chongqing University State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences School of Software Technology Zhejiang University School of Computer Science and Engineering Nanyang Technological University

Partial-label learning(PLL) is a typical problem of weakly supervised learning, where each training instance is annotated with a set of candidate labels. Self-training PLL models achieve state-of-the-art performance but suffer from error accumulation problems caused by mistakenly disambiguated instances. Although co-training can alleviate this issue by training two networks simultaneously and allowing them to interact with each other, most existing co-training methods train two structurally identical networks with the same task, i.e., are symmetric, rendering it insufficient for them to correct each other due to their similar limitations. Therefore, in this paper, we propose an asymmetric dual-task co-training PLL model called AsyCo,which forces its two networks, i.e., a disambiguation network and an auxiliary network, to learn from different views explicitly by optimizing distinct tasks. Specifically, the disambiguation network is trained with a self-training PLL task to learn label confidence, while the auxiliary network is trained in a supervised learning paradigm to learn from the noisy pairwise similarity labels that are constructed according to the learned label confidence. Finally, the error accumulation problem is mitigated via information distillation and confidence refinement. Extensive experiments on both uniform and instance-dependent partially labeled datasets demonstrate the effectiveness of AsyCo.

关键词： machine learning weakly supervised learning partial-label learning co-training models candidate label sets

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Scheduling optimization for UAV communication coverage using virtual force-based PSO model

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Digital Communications and Networks 2024年第4期10卷 1103-1112页

作者： Jianguo Sun Wenshan Wang Sizhao Li Qingan Da Lei Chen College of Computer Science and Technology Harbin Engineering UniversityHarbinHeilongjiang150001China College of Engineering and Computing Georgia Southern UniversityStatesboroGA30458USA

When the ground communication base stations in the target area are severely destroyed,the deployment of Unmanned Aerial Vehicle(UAV)ad hoc networks can provide people with temporary communication ***,it is necessary to design a multi-UAVs cooperative control strategy to achieve better communication coverage and lower energy *** this paper,we propose a multi-UAVs coverage model based on Adaptive Virtual Force-directed Particle Swarm Optimization(AVF-PSO)*** particular,we first introduce the gravity model into the traditional Particle Swarm Optimization(PSO)algorithm so as to increase the probability of full ***,the energy consumption is included in the calculation of the fitness function so that maximum coverage and energy consumption can be ***,in order to reduce the communication interference between UAVs,we design an adaptive lift control strategy based on the repulsion model to reduce the repeated coverage of *** results show that the proposed coverage strategy based on gravity model outperforms the existing state-of-the-art *** example,in the target area of any size,the coverage rate and the repeated coverage rate of the proposed multi-UAVs scheduling are improved by 6.9–29.1%,and 2.0–56.1%,***,the proposed scheduling algorithm is high adaptable to diverse execution environments.©2022 Published by Elsevier Ltd.

关键词： Multi-UAVs Ad hoc network Area collaborative coverage Gravity model Swarm optimization algorithm Random topology

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Evaluation on quality and health risk of groundwater in a highly urbanized watershed, China

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Environmental science and Pollution Research 2024年第18期31卷 27136-27154页

作者： Li, Jingjing Zhang, You-Kuan Zhao, Yuqing College of Environmental Science and Engineering Guilin University of Technology Guilin541004 China Urban Planning & amp Design Institute of Shenzhen Shenzhen518000 China The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of Technology Guilin541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541004 China School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Urbanizations and industrializations may accelerate the contamination and deterioration of groundwater quality. This study aimed to evaluate the quality and potential human health risks associated with shallow groundwater in Shenzhen, China, a city characterized by high levels of urbanization and industrialization. The hydrochemistry characteristics, water quality levels, and human health risks of main ions, nutrient elements, and metals in 220 samples collected from Maozhou River Basin (MRB) located in the northwest of Shenzhen were investigated. It showed that chemical constituents of the groundwater were further complicated by seawater intrusion and urbanization expansion. Water quality evaluated by fuzzy comprehensive method showed that 21.05% of samples distributed around reservoirs were classified into grade II or better. Nearly 79% of samples distributed in the densely populated urban land were classified into grade III or worse, indicating pollution from anthropogenic factors cannot be ignored. For the river tidal reach where river stage fluctuated about 0.5 to 1.5 m within a tidal cycle, the chemical composition of groundwater was influenced by frequent water exchange with the river. The carcinogenic and non-carcinogenic health risks for different age groups, from the high to the low, were children, adult women, adult men, adolescent women, and adolescent men, respectively. Approximately 39% of groundwater samples distributed around the densely populations area with health risk larger than 5 × 10−5 were unacceptable for children. This investigation would be helpful for improving groundwater management and as a practical reference for sustainable groundwater exploitation in the MRB. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Groundwater

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