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Table of Content

    28 October 2025, Volume 35 Issue 10
    Safety science theory and safety system science
    Visualization analysis of alcohol-based fuel research in China
    ZHOU Yan, CHANG Ziyi, WANG Li, REN Changxing
    2025, 35(10):  1-7.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0414
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    In order to clarify the research hotspots, development trends and accident risk characteristics of alcohol-based fuels, and point out the direction for the development of alcohol-based fuels, CiteSpace software was used to collect 3 951 relevant journal papers from 1978 to 2024 in China National Knowledge Infrastructure. Bibliometrics and knowledge map visualization analysis methods were used to systematically analyze the annual publication volume and subject distribution in this field, and analyze research hotspots from keyword co-occurrence, clustering and emergence. The results show that the research on alcohol-based fuels in China has experienced three stages of continuous growth, fluctuation adjustment and steady development. At present, driven by the development of national energy strategy and technology, the research attention has been steadily improved. The research involves many fields such as electric power, chemical industry, automobile, power and fuel. The research hotspots are highly concentrated in the four major themes of methanol fuel preparation technology, fuel cell application, power and environmental impact assessment of methanol fuel. Existing research significantly focuses on basic material properties and technology applications, and systematic research on safety risks is relatively scarce. Therefore, this paper further clarifies the bottleneck of current risk prevention and control, and puts forward that future research should focus on fuel intrinsic safety technology, construction of intelligent supervision system of the whole chain and improvement of emergency response capacity, so as to provide theoretical reference and direction for the safe development of alcohol-based fuel.

    Safety engineering technology
    Risk factors of voluntary incident reporting by aircraft maintenance personnel
    LIU Junjie, HE Junfeng
    2025, 35(10):  8-16.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1034
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    In order to effectively prevent the occurrence of civil aviation maintenance related events, a sample of 2 687 voluntary reports from the US Aviation Safety Reporting System (ASRS) database (2001-2023) was examined. Fourteen risk factors, including work environment and human factors, were analyzed using CiteSpace. Strong couplings between these factors were identified through UCINET and Gephi. The results show the following findings: Among the nine single risk factors, key risks are identified as landing gear system malfunctions, poor lighting, and rain (with frequencies of 103, 64, and 45, respectively). Among the five coupled risk factors, key risks are found to be airframe maintenance, communication breakdown, and human factors (with co-occurrence frequencies of 1 646, 1 448, and 1 206, respectively). The analysis of all risk factor couplings reveals that the strongest coupling exists between airframe maintenance and powerplant maintenance (with a weight value of 3 568). Additionally, a significant coupling relationship is observed between procedures and improper landing gear system operations (with a weight value of 118).

    Safety social science and safety management
    Comparison and application of audit modes of QHSE management system in oil and gas long-distance pipeline enterprises
    CUI Jinghui, DONG Guoyu, ZHANG Liang, XU Zhi, TONG Ruipeng
    2025, 35(10):  17-23.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0461
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    Safety management of long-distance oil and gas pipeline enterprises has been regarded as essential for ensuring energy security and maintaining social stability. As a key approach to enhancing safety management efficiency, audits of QHSE management systems are increasingly emphasized. In this study, traditional audit modes—including international safety rating audits, full-factor quantitative audits, and system certification audits—were systematically compared and analyzed. Additionally, the features and applicable contexts of emerging audit modes, such as data-driven audits and AI-based audits, were further explored. It was found that each audit mode presented distinct advantages and limitations, depending on the enterprise’s stage of development, risk management demands, and resource capabilities. Accordingly, a comprehensive audit framework integrating conventional methods and intelligent technologies was constructed. Optimization strategies were proposed, including phased audit mode selection, risk-oriented focus, capacity enhancement, digital and intelligent transformation, and the establishment of a closed-loop rectification mechanism. The findings show that a multi-mode integrated audit system significantly improves the safety performance of long-distance oil and gas pipeline enterprises. The conclusions provide theoretical guidance and practical reference for the selection and optimization of QHSE audit modes in the oil and gas industry.

    Safety engineering technology
    Literature review on application of case-based reasoning in construction project safety risk management
    XIA Nini, XU Gan
    2025, 35(10):  24-35.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0588
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    CBR can effectively address the issue of unclear elements in safety risk management. However, existing research lacks systematic reviews of its application status and development trends. To systematically summarize the current state of research on the application of CBR in construction safety risk management and to identify future research directions, this paper comprehensively reviewed 45 Chinese and 50 English papers, employing bibliometric analysis and content analysis. The results show that the number of publications shows a fluctuating upward trend and tends to stabilize, spanning multiple disciplines such as environmental science and computer science. Key scholars demonstrate both commonalities and differences in collaboration themes, with China ranking first in publication volume. The research themes have evolved from knowledge construction and methodological exploration toward integration and intelligent convergence. CBR has been widely applied in safety risk identification, analysis and assessment, response, and knowledge management, yet limitations remain regarding control targets, application scenarios, knowledge management, data integration, and workflow optimization. Future research should focus on expanding control targets, developing whole-process management scenarios, establishing collaborative knowledge management mechanisms, integrating multi-source heterogeneous data, and improving workflows to advance the development of intelligent safety risk management in construction projects.

    Situational awareness evaluation of flight trainees based on combined weighting cloud model
    HAO Hongxun, ZHAO Zehai, HUANG Cheng, XU Jiahui
    2025, 35(10):  36-43.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0243
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    In order to enhance the flight training capabilities of trainees, identify and evaluate flight trainees' situational awareness, an index system for evaluating flight trainees' situational awareness was established based on grounded theory. The combined weights were calculated using game theory to integrate subjective weights, which were determined by the G1 method, and objective weights, which were derived from the criteria importance through intercriteria correlation(CRITIC) method improved by the coefficient of variation method. Subsequently, a combined weighting cloud model was proposed: the digital characteristic values of the evaluation indices were input into a cloud generator to obtain situational awareness ratings, and the model was verified for the use of an example to evaluate the situation awareness of a flight trainee. The results indicate that the cloud model can comprehensively evaluate the situational awareness of flight trainees. The overall situational awareness of Trainee A was rated as excellent. Among the indicators, the flight discipline metric yielded the best evaluation result, contributing significantly to the maintenance of situational awareness. The flight operation skills metric was rated between the best and the poorest, while the professional knowledge indicator received the lowest score. Major deficiencies were identified in two primary evaluation indicators, emergency handling capability and adaptability to operational environments, which were found to adversely affect the maintenance of situational awareness.

    Campus safety management evaluation system based on risk metaphor graph
    WANG Qian, LI Muchen, WEI Zongshuai, PI Fuping, TONG Ruipeng
    2025, 35(10):  44-51.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1556
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    To investigate the constituent elements and improve the performance of campus safety management work, the theoretical connotation and practical paths of the campus safety management evaluation system from the perspective of risk metaphor were explored. Firstly, the constituent elements of campus safety management were sorted out based on the safety management correlation model, and the dimensions of campus safety management were analyzed from the metaphorical characteristics of black swan risks, gray rhino risks, golden monkey risks, and white rabbit risks. Secondly, through sorting out campus safety policy texts and accident cases, the evaluation indicators for campus "safety management system-safety management behavior-safety management status" were systematically designed. Then, the weights of evaluation indicators were calculated using the fuzzy analytic hierarchy process(FAHP) and the entropy weight method(EWM). The game theory was introduced to determine the subjective-objective combined weights, and the technique for order preference by similarity to ideal solution was used to compare the levels of safety management performance. The safety management data of typical cases were entered into the information platform, and the campus safety management model was proposed for the evaluation results based on risk metaphor theory. The results show that the risk metaphor graph is an important tool for constructing campus safety management models by integrating multi-dimensional perspectives. The campus safety management evaluation system can present the scores of indicators at all levels and the overall safety management level, and the risk metaphor theory provides theoretical support and practical guidance for campus safety management.

    Construction and network analysis of knowledge graph of vaccine supply chain based on big data from tender transactions
    HE Yuqi, WEI Wanying, CAI Mengsi, TAN Suoyi, ZHENG Huijun, LYU Xin
    2025, 35(10):  52-59.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1067
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    To decouple the structural complexity of industrial and supply chains, address systemic risks, and enhance supply chain resilience, bidding transaction big data was employed. Taking the vaccine sector as an example, a framework for constructing a supply chain knowledge graph was designed, and a systematic supply chain knowledge graph was established. On this basis, complex network techniques were applied to examine the vulnerability and potential security risks of China's vaccine industry supply chain network from 2011 to 2023. The research encompassed complex knowledge queries of the industrial chain, an analysis of city degree distribution patterns, and simulations and analyses of supply chain risks. The study shows that the vaccine industry chain exhibits spatial imbalance, particularly between eastern and western regions. The production structure is highly dependent, with approximately 61.3% of vaccine varieties relying on a single manufacturer or overseas agent. Manufacturers with high centrality constitute potential risk points within the vaccine supply chain network, where disruptions to about 33 enterprises significantly hinder vaccine supply. Compared with core cities, the cumulative effects of cities with lower network status, such as Chongqing, Dalian, Shenzhen, and Shenyang, have a more pronounced impact on the efficiency of vaccine circulation.

    Cognitive bias and decision optimization mechanism in energy engineering safety: case study of Fukushima nuclear power plant accident
    LIU Yuteng, LIU Yufei, WANG Jinggang, LUO Jinghui, ZHANG Changjian
    2025, 35(10):  60-66.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1684
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    To study the impact of cognitive bias on energy safety engineering decision-making, the Fukushima nuclear power plant accident was taken as the research object. A full-cycle decision-making analysis chain, covering risk identification (earthquake and tsunami assessment), crisis disposal (cooling system failure treatment), and aftermath management (information disclosure decision-making), was built through retrospective analysis of the accident timeline and key decision points. Cognitive psychology theory was used to analyze decision-making bias phenomena in energy engineering safety management, and the specific mechanisms of these biases in emergency response and risk assessment were revealed. Results show that six typical cognitive biases are present in the emergency decision-making during this accident, including confirmation bias, anchoring effect, representative heuristics, framing effect, loss aversion, and overconfidence. This analysis demonstrates that cognitive bias identification can enhance energy engineering safety management, and improve the effectiveness of safety emergency responses.

    Civil aviation maintenance man-hour prediction method based on safe energy consumption
    GUO Qing, ZHU Jianghai, FU Yu, ZUO Hongfu
    2025, 35(10):  67-74.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1346
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    To accurately predict the standard man-hours of aircraft maintenance tasks, a predictive method based on safe energy consumption for aircraft maintenance standard man-hours was proposed. Firstly, a drivable virtual human was constructed based on the skeletal parameters of the human body and the computational rules of Euler quaternions. Subsequently, motion data during maintenance processes were captured using motion capture devices. The Roberson-Wittenburg and inverse dynamics methods were then employed to calculate the joint torques borne by the virtual human during the maintenance tasks, thereby estimating the energy consumption during the maintenance process. Based on the fatigue assessment of human energy consumption, preliminary standard maintenance man-hours conforming to safety energy consumption were calculated. The study demonstrates that prediction results based on safe energy consumption are closer to the manufacturer's recommended times, with a smaller root mean square error than modular arrangement of predetermined time standards(MOD) method, indicating that this approach better reflects the actual maintenance man-hours.

    Construction safety accident prediction model based on GWO-RF
    WANG Dan, PAN Xianglian
    2025, 35(10):  75-81.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0630
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    In order to reduce the occurrence of building construction safety accidents, association rules were used to reveal the mechanism of accident association, and the optimized RF was fused to predict the occurrence of accidents. First, the causal factors of 388 case reports of construction safety accidents were extracted using 24Model as the theoretical basis. Then, Apriori algorithm was used to excavate the interrelated action paths between the accident causal factors. Finally, hyper-parameters of RF were optimized using GWO algorithm, and the GWO-RF prediction model of construction safety accidents was constructed. And the accident causal factors were the characteristic importance ranking was carried out. The results show that: unsafe behavior, safety ability of organization members, safety management system and safety culture elements constitute a combination of strong correlation conditions. GWO can effectively optimize the hyper-parameters of RF, and prediction accuracy of the optimized GWO-RF model is as high as 93.2%. The characteristic importance ranking shows that: safety education and training have the greatest influence on the prediction of construction safety accidents, with a weighting of 10.5% and a weighting of 10.5%. The importance ranking of features shows that: safety education and training has the greatest influence on the prediction of building construction safety accidents, with a weight of 10.5%. And safety integration management, safety production rules and regulations, and safety production responsibility system are the important factors affecting the prediction of building construction safety accidents, with weights of 7.5%, 7%, and 6%, in that order.

    Analysis method of airport terminal operation resilience considering redundancy
    QI Lin, CHEN Xiaolin
    2025, 35(10):  82-90.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1768
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    To ensure the normal operation of the airport terminal system, the impact of redundancy on operation resilience was analyzed by taking incidents such as security checkpoint failures and staff absenteeism at check-in counters as examples. A definition and quantification method for resilience, covering the entire process from system disruption to recovery, was proposed. T1 terminal of a major airport handling tens of millions of passengers annually was selected as a case study. An operation model of the terminal was constructed based on Anylogic. The influence of the number of security checkpoint failures, failure duration, recovery measure intensity, and the number of absent staff at manual check-in counters on terminal operation resilience was analyzed under scenarios with and without redundancy. The results indicate that when the system redundancy is lacking, the operation resilience of the terminal decreases as the number of security checkpoint failures and absent staff increases, shows no significant correlation with failure duration, but improves with the enhancement of recovery measure intensity. In contrast, when the system incorporates redundancy, the functional level either remains unaffected or declines less significantly compared to the non-redundant scenario, and the system resilience is higher. Moreover, if the system possesses redundancy and the redundancy degree exceeds the disruption intensity, the functional level remains unchanged, and the system resilience approaches 1.0. Therefore, redundancy is a critical factor that cannot be overlooked in resilience analysis.

    Risk assessment of UAV operation considering risk of mid-air collision
    LI Nan, YAN Boyun, SUN Linshi, HAN Peng, ZHENG Zhigang, JIAO Qingyu
    2025, 35(10):  91-97.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0894
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    To improve the efficiency of UAV air traffic management, ensure flight safety and promote the safe application of UAVs in complex airspace environments, the risk assessment of UAV operation was focused in this paper. Firstly, for UAVs with autonomous perception and decision-making capabilities in unstructured airspace environments, based on key parameters such as airborne communication, navigation and surveillance capabilities, maneuvering characteristics and system response time. A conflict probability model and a collision probability model considering avoidance maneuvering strategies were constructed to quantitatively evaluate the airspace collision risks. Then, considering that UAV collision accidents do not directly cause casualties, a ground risk assessment model was constructed that comprehensively considers UAV aerial collision events and crashes caused by system failures. Finally, taking 1×10-6 deaths/flight hours as the safety target level, the safety separation that needs to be maintained during airborne flights was determined. The results show that considering both the conflict probability and the probability of the conflict escalating into a collision simultaneously can solve the problem of underestimated risks during the free flight stage. The maximum allowable collision risk varies significantly among different operating scenarios.

    Identification model of miners' unsafe behaviors in coal mine conveyor belt
    HAO Qinxia, ZHANG Jiaqian
    2025, 35(10):  98-105.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1778
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    To improve the accuracy and real-time performance of identifying unsafe behaviors of miners in the mine belt transportation area, and to address the problems of poor real-time performance and high false detection rate in existing manual monitoring methods, a dual-stream spatiotemporal fusion network (DS-SFNet) that integrated image features and human skeleton features was proposed. First, challenges such as low illumination and dust interference in underground environments were addressed by designing a sub-pixel convolutional block attention module (SPCBAM), which combined with sub-pixel convolution and depth wise separable convolution to optimize feature representation. Second, to mitigate the high computational resource consumption of the OpenPose model, its backbone feature extraction network was reconstructed using MobileNet v3 by incorporating dilated convolutions and cross-layer connections. Finally, a hierarchical feature fusion module was constructed to deeply integrate image features and skeletal trajectory features through spatiotemporal alignment and complementary modeling. The results demonstrate a recognition accuracy of 76.4% on HMDB51 (Human Motion Database 51) and 97.9% on UCF101 (University of Central Florida 101), outperforming the SlowFast model by 1.5% and 1.1%, respectively. On a self-built coal mine dataset containing four unsafe behaviors (climbing, crossing, leaning, and hand-leaning), the average recognition accuracy reaches 92.3%. The MobileNet v3-reconstructed OpenPose model reduces parameters to 11.5% of the original Visual Geometry Group 19 (VGG19) network while increasing inference speed by over 3 times. The complete framework achieves a single-frame processing time of 38.7 ms and a parameter count of 57.3 M.

    Intelligent question answering model for construction safety hazards based on vision-language multimodality
    WANG Zhe, HUANG Haichen, LI Ruiqin, WEI Yongchang
    2025, 35(10):  106-114.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1435
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    In order to enhance the intelligent diagnosis level of safety problems in complex construction environments, an intelligent question-answering model for construction safety hazards based on vision-language multimodality was proposed. A dataset of image-text pairs related to construction safety hazards was constructed. A visual encoder was used to complete the visual encoding of safety hazard images, and a language model was employed to encode the question-answering texts about safety hazards. A multimodal feature fusion module was adopted to achieve effective interaction between image and text information. A specific input template for visual question answering adapted to the scenario of construction safety hazards was constructed. The model was fine-tuned based on matrix low-rank decomposition, and multi-round prompts were used to guide the model in generating accurate answers. The results show that compared with existing contrastive models, the intelligent question-answering model for construction safety hazards performs better in automatic evaluation metrics, Generative Pre-trained Transformer(GPT)-4 evaluation, and expert evaluation, with significantly improved fluency and semantic relevance of the generated texts. Ablation experiments further verify the effectiveness of each sub-module, confirming that the synergistic effect of matrix low-rank decomposition fine-tuning and multi-round reasoning is the key for the model to achieve optimal performance, and that reasonably setting the rank parameter of the low-rank matrix can effectively avoid the overfitting problem.

    Research on detection of subgradecollapse hazards based on GMM clustering and high-density resistivity method
    ZHANG Yanhui, ZHANG Yuyan, HU Yujia, LUO Zhibin, ZHAO Weigang
    2025, 35(10):  115-123.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1430
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    To address the issues of insufficient resolution in the high-density electrical resistivity method and limited accuracy in anomaly indentification for road collapse hazard detection, resolution tests for road collapse hazard detection based on high-density electrical resistivity method and investigation of an anomaly identification method using GMM clustering were conducted. Forward modeling was performed using the finite difference method, while inversion process was carried out using the Gauss-Newton method. Numerical simulations were conducted to assess the effect of different electrode spacing configurations on detection resolution. In the context of pipeline leakage-induced road collapse, geoelectric models for underground anomalies at various stages of development were designed, and GMM clustering analysis was applied to optimize the inversion results of the high-density electrical resistivity method. The results demonstrate that adjusting the electrode spacing and measurement parameters can significantly improve detection resolution. At a depth of 4.5 meters, the location and shape of underground anomalies at a scale of 1 meter can be effectively characterized by reducing the electrode spacing. An electrode spacing of 0.5 meters can balance detection accuracy and computational efficiency, corresponding to half the scale of the target anomaly. For anomalies buried at the same depth, the resistivity recovery of low-resistance anomalies is superior to that of high-resistance anomalies, providing the basis for parameter optimization for detecting various anomaly types. The feasibility of high-density electrical resistivity method to detect leakage-induced detects at different stages is demonstrated through tests on underground cavity models induced by pipeline leakage, while the identification accuracy of anomaly regions is further enhanced by the GMM-based clustering analysis.

    Review of design and evaluation of visual guiding devices for highway tunnels
    MEI Jialin, DU Zhigang, QIAN Zhihao, JIAO Fangtong
    2025, 35(10):  124-130.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1193
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    In order to enhance driving safety in highway tunnels and to reduce visual distraction and burden caused by improperly designed visual guiding devices, a research framework for the design and evaluation of tunnel visual guiding devices was proposed. A systematic review of domestic and international literature has been conducted to analyze the effectiveness and design parameters of various types of visual guiding devices, and to clarify their key functions in delineating spatial right-of-way, ensuring adequate sight distance, and enhancing visual comfort. In addition, current studies were reviewed to summarize data acquisition methods and core evaluation indicators, thereby constructing a scientific evaluation system. The limitations of existing research were also identified, and future research directions were proposed. The results show that visual guiding devices can optimize the tunnel visual environment by clarifying spatial right-of-way, increasing effective sight distance and visual fields, and mitigating visual illusions. The type and spacing of devices should be determined based on spatial right-of-way, curvature perception, speed perception, and visual comfort. Real-vehicle experiments and indoor simulations serve as key approaches for exploring design parameters and optimization strategies, while field observations and accident data analysis can further validate their effectiveness. Indicators such as visual perception, visual characteristics, physiological responses, and driving behavior are suggested as core evaluation metrics. Moreover, multi-indicator interaction analysis may help reveal the mechanisms by which visual guiding devices influence driver behavior.

    A method for assessing probability of high-risk scenarios of CCUS aboveground injection system in oilfields
    MU Jingjing, LIU Qinglong, WANG Jinshan, DUAN Weichao, LIU Rentao, ZHAO Dongfeng
    2025, 35(10):  131-139.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1068
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    To achieve dynamic risk management and control during the CO2 injection process in CCUS oilfields and prevent CO2 leakage acidents, a dynamic assessment method for the probability of high-risk scenarios was proposed. Firstly, a novel improved FPN model was developed by integrating a three-parameter Weibull distribution model for equipment failure probability based on Grey Model (GM) and Support Vector Machine (SVM) with FPN model. Subsequently, the risk analysis was conducted on the above ground CO2 injection system of CCUS process. The CO2 leakage accident chain was established to quantitatively predict the accident occurrence probability. The dynamic characteristic of equipment failure probability changing with time (t) and the impact of protection layers on risk were taken into account by the improved FPN. The results indicate that when t=500 h, the risk exhibits an exponential increase. The safety valve is identified as the protection layer with the highest importance. When t=303 days, the system's residual risk reaches the PetroChina risk acceptance criterion of 1×10-5, indicating that the system risk becomes unacceptable beyond this point. It is recommended to add a high-high level interlock protection layer, which extends the time until system risk becomes unacceptable to 5 832 days, thereby significantly reducing maintenance frequency and costs.

    Public safety
    Structural safety evaluation of commercial buildings in operation andmaintenance phase based on combined empowerment and improved TOPSIS
    CHEN Dachuan, DUAN Xiaofeng, CHEN Mingsi, WEN Zhengdong, SHI Jinsong
    2025, 35(10):  140-148.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1605
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    In order to prevent structural safety accidents in commercial buildings during the operation and maintenance phase and enhance the objectivity and accuracy of structural safety assessments for commercial buildings, the following steps were taken: First, a structural safety evaluation system for the operation and maintenance phase of commercial buildings was established. The weights of each evaluation indicator within the system were determined using a combined objective-subjective weighting method based on the Analytic Hierarchy Process (AHP) and the Criteria Importance Through Intercriteria Correlation (CRITIC) method. Second, by incorporating the improved TOPSIS method with interval numbers, the interval values of safety evaluation indicators corresponding to different structural safety levels of commercial buildings were determined, yielding relative proximity values under different safety condition levels. Finally, taking a commercial complex building in Changsha City as an example, the safety condition was evaluated based on on-site inspection data, and the results were compared with those from the inspection report issued by a professional inspection institution after appraisal to verify the accuracy and applicability of the established indicator system and calculation results. The study indicates that by combining industry standards and expert experience to establish the evaluation indicator system, and using the combined weighting method and the interval-based TOPSIS evaluation method improved with interval numbers on the basis of existing research, the objectivity and accuracy of structural safety assessment for commercial buildings can be enhanced.

    Review of application of dynamic network algorithms in urban road network emergency scenarios
    ZHANG Ziyang, YANG Saini
    2025, 35(10):  149-156.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1633
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    In response to new challenges, the application characteristics of dynamic network algorithms were reviewed. These challenges were posed by complex and diversified urban emergency scenarios. Heterogeneous data fusion and algorithmic collaboration were involved. Additionally, approaches for multi-algorithm collaboration and integration were explored. Firstly, based on 128 publications from the past five years in the Scopus database, four major research themes: path planning, traffic regulation, risk prevention, and resilience analysis, which were identified using keyword frequency statistics and cluster analysis. Then, through content analysis, four core algorithm categories: planning, simulation, clustering, and deep learning were summarized. Their theoretical frameworks and task adaptation logic were examined in conjunction with empirical data, simulations, and hybrid data sources. Finally, a multidimensional evaluation system was constructed to comparatively assess the applicability, strengths, and limitations of different algorithms across various emergency scenarios. The results show that multiple algorithms are integrated in application,which include planning, simulation, clustering, and deep learning. This integrated approach enables a multidimensional response to urban emergency management tasks. Such tasks involve path planning, traffic regulation, risk prevention, and resilience analysis. The adaptability of emergency systems are enhanced. The robustness of these systems is also improved. Data-driven intelligent algorithms further improve the responsiveness of urban road networks, supporting real-time strategy adjustment and resource optimization. Future development should focus on the construction of intelligent collaborative architectures for algorithm integration and coupled analysis across multiple networks, to advance the efficient application of dynamic network algorithms in multi-scenario emergency management.

    A VR particle fire-extinguishing algorithm based on heat transfer and firefighting training system construction
    WEN Zheng, ZHANG Jianqin, TIAN Ao, HU Chaonan
    2025, 35(10):  157-165.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1529
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    To enhance the immersion and effectiveness of fire training and improve the interactive experience of acquiring fire-extinguishing skills, a VR particle fire-extinguishing algorithm based on a heat transfer was proposed and developed on a VR platform. First, a thermodynamic interaction model at the particles level was constructed by introducing a heat transfer mechanism to simulate the energy transfer process between extinguishing agent particles and flame particles. Then, the random walk algorithm was combined with the vortex dynamics model to enhance the natural behavior of the particle system during spraying, diffusion, and turbulence, thereby improving the dynamic realism of flame propagation and fire suppression. Finally, a VR-based fire training system featuring multiple typical fire scenarios was developed based on the Unity 3D engine, and simulation experiments were conducted to validate the matching relationship between different types of fire extinguishers and fire categories. The results show that the collision frequency and energy attenuation curves between extinguishing particles and flame particles vary significantly depending on the extinguisher type and its applicable scenario. Furthermore, the flame decay rate governed by the heat transfer model is closely related to the type of fire extinguisher, effectively reflecting the physical patterns of fire suppression processes.

    Operational resilience measurement and spatio-temporal evolution analysis of urban bus systems
    HUANG Xian, JI Tao, DENG Shejun, YU Shijun, ZHU Yunqiang, SHAO Jinliang
    2025, 35(10):  166-173.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1431
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    To characterize the performance curve of urban bus systems under different rainfall intensities, a resilience measurement model for urban bus system operations was constructed. Taking the bus system in the main urban area of Yangzhou as a case study, the operational resilience of transit networks across different regions and individual routes were analyzed. Building upon aforementioned resilience measurement results, the operational status of bus stops under different resilience levels was further quantified. The spatio-temporal patterns of resilience evolution within the integrated "network-route-stop" hierarchy were elucidated. The results show that during rainfall events, urban bus systems exhibit varying performance disturbances across different regions. The variations in the absorption, recovery, and adaptation capacities of bus systems across different regions, significant spatial heterogeneity in resilience is observed, resulting in pronounced spatial heterogeneity in operational resilience. The combined effect of morning peak hours and extreme rain events has a notable impact on bus operational resilience. It is also found that the operational resilience of bus routes varies across different regions under rainfall events of varying intensity, and different levels of resilience lead to significant differences in the performance losses of bus stops. Notably, under low resilience conditions, the reliability of stops decreases (an increase in arrival intervals and a decrease in stop punctuality).

    Risk assessment of urban drainage networks based on fuzzy Bayesian networks
    YANG Wenjia, WU Lianghong, LIN Weidong, YANG Fuqiang
    2025, 35(10):  174-180.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1302
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    In order to improve the ability of accident prevention and risk control of urban drainage networks, first of all, based on the indicators from the four aspects of "human-material-management-environment", 19 assessment indicators were obtained to construct the risk assessment index system of urban drainage pipe networks, and a risk evaluation index system for urban drainage networks was established accordingly. Subsequently, a model of urban drainage networks was constructed by integrating fuzzy theory and BN. Triangular fuzzy numbers were introduced to quantify the scores of experts. Weights were assigned according to differences in professional titles and working years, and α-weighted valuation method was adopted to transform fuzzy evaluations into clear probabilities. Thus, a risk evaluation model for urban drainage networks was obtained, and forward and reverse reasoning of BN was conducted to calculate the posterior probabilities of key nodes. Finally, taking the drainage network of a certain urban area as an example, the risk level of the drainage network in a specific area of the city was evaluated, and investigations were conducted for verification. The results indicate that the model effectively handles uncertainties and subjectivity in the risk assessment process, achieves probabilistic characterization of drainage network risks, and improves the accuracy of evaluation outcomes. External pipe protection is identified as the most critical factor affecting drainage network safety, followed by anti-corrosion measures and joint methods. The overall safety performance of the urban drainage network is found to be satisfactory, with risks remaining within controllable limits. Comparative analysis with historical monitoring data and fault records confirms the practicality and reliability of the model.

    Firefighting response zone division method based on block accessibility
    WU Yanglong, LIU Dingli, YUAN Diping, LIU Weijun, XU Zhisheng, LEI Xiao
    2025, 35(10):  181-189.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0604
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    In order to enhance the emergency response efficiency of fire rescue zones, a block accessibility-based method for dividing fire rescue territories was proposed. Basic data were obtained through block boundary extraction, as well as the localization of fire stations and demand points. Multi-period real-time traffic data were acquired via an online map to calculate the integrated travel time from each fire station to every block unit, which served as the basis for division. Blocks were assigned to the corresponding fire station based on the shortest accessibility time. Finally, an optimized zoning scheme and an evaluation of the overall regional accessibility were output. A case study was conducted in the HN-FR area, involving 8 fire stations and 10 067 demand points. A total of 542 block units were extracted, and analysis was performed using 618 483 data samples across 29 scenarios. Results indicate that the overall accessibility time for the HN-FR region is 435.96 s, reflecting relatively poor fire rescue accessibility. Furthermore, significant disparities are observed in the areas of the eight fire station territories, ranging from 0.37 to 12.36 km2. This variation is primarily attributed to the proximity of some fire stations to the boundary of HN-FR, resulting in minimal coverage capacity.

    Technology and engineering of disaster prevention and mitigation
    Improved U-Net-based model for urban flood disaster image recognition
    ZHONG Xingrun, TIAN Chenbin, LI Xinhong, MENG Xiaojing, YANG Wenxin
    2025, 35(10):  190-197.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1312
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    In order to address the challenges of inaccurate region segmentation and insufficient detail restoration in flood disaster recognition models within complex urban environments, AttResU-Net, an enhanced U-Net semantic segmentation model integrating residual networks and a self-attention mechanism was proposed. Building upon the classical U-Net architecture, the model employed a deep residual network as the encoder to strengthen feature representation. Simultaneously, self-attention mechanisms were incorporated into the decoder to enhance response capability on key flood-related regions. A comprehensive training and testing pipeline was established. The improved AttResU-Net was trained and evaluated on the FloodNet dataset, which contains diverse and complex urban environmental categories. Quantitative metrics and qualitative visual results demonstrate the model's superior performance, achieving a mean pixel accuracy (mPA) of 79.75%, pixel accuracy (PA) of 90.01%, and mean precision (mPrecision) of 81.78%. Comparative experiments against state-of-the-art models reveal that AttResU-Net attains significantly higher segmentation accuracy and global recognition capability, particularly for urban features such as trees, water bodies, roads, and buildings.

    Emergency technology and management
    Safety design for maritime emergency casualty disposal cabin based on CTA
    WANG Qiuhui, YUN Ting
    2025, 35(10):  198-204.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1197
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    In order to enhance maritime emergency rescue efficiency and reduce casualties, a systematic safety design strategy for maritime casualty disposal cabins was proposed. CTA was first used to identify rescue personnel's core needs during critical tasks. The Kawakita Jiro Method method and Analytic Hierarchy Process (AHP) were then used to prioritize these needs. Quality Function Deployment (QFD) was used to translate them into design elements, and Axiomatic Design (AD) was used to map functional requirements to design parameters. Results show that the integrated CTA-QFD-AD approach effectively identifies functional requirements and safety design elements. Optimizing key factors, such as ergonomic dimensions, spatial layout, Color-Material-Finish (CMF), environmental interfaces (lighting, noise, vibration), and tool/information interfaces, can significantly improve human-machine efficiency and ensures rescue safety.

    S3DA2 framework for emergency command system and key technologies of emergency digital twin battlefield
    CHEN Tao, ZHANG Hui, HUANG Lida, TIAN Ranran, YAN Xiaoli
    2025, 35(10):  205-212.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1646
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    To remedy the fragmented command tiers, a weak data-to-decision link and poor dynamic adaptability, which have long limited the effectiveness of China's emergency-response system, an integrated framework based on digital-twin technology was investigated. A generic four-tier, five-step model—comprising an emergency-command center, on-site command post, rescue teams and individual rescuers, together with the steps Sense, Simulate, Strategize, Decide and Act—was established and extended to the S3DA2 framework. A cost-minimization formula for optimal decision making was derived. Building on this framework, an emergency digital-twin battlefield technology system was established, encompassing multi-source data fusion, twin modelling, fluid-solid-coupled/artificial intelligence hybrid simulation and multi-objective decision optimization. A fluid-solid coupling, multi-agent rescue simulator was developed and validated with the 2024 Tuanzhou Dyke breach on Dongting Lake, enabling a real-time closed loop between the physical scene and its virtual replica. Results show that breach-width predictions deviate by less than 10%, total sealing time is reduced from 82 h to 52 h, and the estimated rock-fill demand of 5.9 × 104 m3 matches field measurements.

    Multi objective site selection model for emergency material storage in chemical industry park based on risk
    GUAN Wenling, TIAN Weijia, DONG Chengjie, XIA Yueshuang, LIAO Fei
    2025, 35(10):  213-219.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1348
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    In order to improve the efficiency of emergency rescue and reduce accident losses in chemical industrial parks, this study comprehensively considered the risk of chemical parks and the overall risk of emergency supplies, divides the cost of emergency rescue into the cost of construction of emergency supplies reserve, storage cost and transportation cost, and established a model for selecting the site of emergency material reserve in chemical parks. The model aims to minimize the overall risk, minimize the cost of emergency rescue and optimize the coverage of the reserve to the demand point. Taking a chemical industrial park in Tianjin as an example for validation analysis, the model was solved using the NSGA-II algorithm. When constructing different numbers of emergency material storage within the chemical industrial park, the optimal solutions for the location, cost, risk, and coverage of these storage facilities were obtained. The research results show that the model converges stably within 200 generations. As the amount of emergency material storage increases, investment costs continue to rise, coverage gradually improves, risks are significantly reduced in the early stages, and stabilize in the later stages. The model can generate multiple site selection schemes, effectively addressing the challenge of balancing the “risk-cost-coverage ratio” in the site selection process for emergency material storage within chemical industrial parks. This helps decision-makers make more scientific and reasonable decisions in complex emergency material storage site selection issues based on different preferences.

    Optimizing layout of emergency shelters in rural areas based on optimal supply-demand allocation: a case study of Xicun town, Jiaozuo city
    HOU Kexin, TONG Yan, FAN Liangxin
    2025, 35(10):  220-229.  doi:10.16265/j.cnki.issn1003-3033.2025.10.0082
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    In order to enhance emergency response capabilities and the service efficiency of shelter systems in rural areas, this study adopted an optimal supply-demand allocation model integrated with Geographic Information System (GIS) software (ArcGIS) to evaluate the accessibility of village-level emergency shelters and township-level short-term shelters in northern Henan province. Key factors influencing shelter site selection were identified to construct a spatial suitability evaluation index system. Using this system, we assessed the spatial distribution of emergency shelters in Xicun town and proposed optimization strategies for the shelter system. The results reveal a significant supply-demand imbalance characterized by poor accessibility, partial overload of village-level shelters, and an irrational distribution with severe shortages of township-level shelters. The suitability evaluation indicates a clear north-south disparity, with higher suitability in the south. After implementing optimization measures—including adding village-level shelters and upgrading those in highly suitable areas—both the balance between supply and demand and overall accessibility are improved across the two-tier shelter system in Xicun town.

    Research on emergency decision-making method for online public opinion on emergency events based on probabilistic linguistic term sets
    CHEN Chong, TAN Ruipu, ZHANG Wende
    2025, 35(10):  230-238.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1691
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    Aiming at the problems of uncertainty and imprecision of public opinion information in emergency response decision-making of emergency events network public opinion, a decision-making method for emergency response to online public opinion on emergency events based on PLTSs was proposed. Firstly, methods such as Python programming and machine learning were used to crawl, preprocess and analyze the sentiment tendency of online public opinion information to obtain the decision matrix characterized by PLTSs. Secondly, the CRITIC assignment method was used to objectively determine the weights of each attribute. Then, the comprehensive relevance of each case was obtained and ranked based on grey correlation analysis(GRA) model. Finally, the effectiveness and practicability of the proposed method were verified through typhoon disaster cases. The results of the study show that the proposed method is able to monitor the online public opinion of emergencies in real time, obtain decision-making data objectively and intelligently so as to realize the quantitative assessment of typhoon disasters. It provides good decision-making support for the relevant emergency departments to effectively respond to the online public opinion of emergencies.

    Occupational health
    Effects of BMI difference on physiological and perceptual responses in hot environments
    YANG Jie, MA Ruitian, WANG Xingming
    2025, 35(10):  239-246.  doi:10.16265/j.cnki.issn1003-3033.2025.10.1714
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    To enhance the personalized thermal protection effectiveness for workers exposed to hot environments and clarify the individualized protection strategies with different body types, this study investigated the physiological and perceptual responses with different BMI in hot environments to explore individual thermoregulation capacity during heat exposure. First, two hot environments were set in a climate chamber, including neutral ((25.1±0.4)℃,(52.8%±1.9%)Relative Humidity(RH),0.1 m/s)and high temperature ((35.0±0.5)℃,(50.0%±2.9%)RH,0.1 m/s). Twenty male participants were recruited and divided into two groups: overweight (BMI ≥ 24) and underweight (BMI < 18.5). Second, participants were initially seated in neutral environment for 10 minutes, then performed alternating cycles of exercise and recovery in the hot environment. Physiological and perceptual responses parameters were recorded during the human trials. Finally, the regulatory mechanism of BMI on thermal responses and the extent of its impact were evaluated by analyzing the differences in subjective and objective indicators between the two groups of subjects. The results indicated that the two groups significantly (p<0.001) differed in core temperature, with the increase of 0.55 ℃ for the overweight group and 0.46 ℃ for the underweight group. The mean skin temperature of overweight and underweight participants increased by 4.2 and 2.9 ℃, respectively, indicating that overweight individuals were more sensitive to high temperatures. The total sweat rate and heart rate of overweight participants were significantly higher than those of underweight participants, while no significant difference was observed for heart rate between the two groups. Differences in BMI led to statistically significant differences in perceptual responses parameters (p<0.05), not only affecting the intensity of thermal responses but also inducing differences in the patterns of regulatory mechanisms. Therefore, individualized thermal protection strategies should be formulated based on body type characteristics.