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Table of Content

    28 September 2022, Volume 32 Issue 9
    Safety social science and safety management
    Rise of precision: a review of emergency risk analysis methodology
    LIU Yi, QIAN Jing, FAN Weicheng
    2022, 32(9):  1-10.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2742
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    In order to improve the timeliness and accuracy of emergency risk analysis, this paper reviewed the development of emergency risk analysis methods through systematic literature insights. The development of emergency risk analysis methods, the research status of technologies, methods, models, and theories supporting quantitative and precise risk analysis, and the difficulties in quantifying complex emergencies and catastrophes were discussed. The results show that the future development trends of emergency risk analysis methods and theories include: studying and proposing methods to optimize qualitative, semi-quantitative, and quantitative models by using information technology such as big data of sensing monitoring and computing, developing emergency risk calculation methods based on data & model & calculation, and developing the ability of accurate risk calculation.

    Safety engineering technology
    Review on development of building (group) and infrastructure safety software
    YUE Qingrui, SHI Zhongqi, ZENG Bin, XU Zhen, ZHONG Rumian
    2022, 32(9):  11-19.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2635
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    In order to comprehensively analyze development status of software in the field of building (group) and infrastructure safety in China, to explore development direction in the future, firstly, development status and trends were introduced, and current mainstream commercial software widely used in China and abroad were sorted out. Then, technical level of the software, mastery degree of core technologies, and application and influence of the software were introduced, and problems and difficulties existing in the development of such safety software with independent intellectual property rights were clarified. Finally, strategic requirements, objectives, key frontier technologies, and support guarantee policies were discussed. The results show that independent intellectual property rights for building (group) and infrastructure safety software are relatively scarce. In the future, in-depth research should be conducted on generic technologies and engineering applications such as information modeling, high-precision simulation and intelligent design.

    Development and applications of large-scale and high order accurate simulation software for hazardous chemical explosion
    WANG Cheng, QIAN Chengeng, ZHANG Wenyao, GU Gongtian, CUI Yangyang
    2022, 32(9):  20-28.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2692
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    In order to accurately simulate the temporal and spatial evolution of explosion propagation of multi-component and multiphase hazardous chemicals in large-scale chemical parks, urban buildings (structures), refueling/gas stations and other scenarios, based on the multi-component reactive Navier-Stokes governing equation, high order accurate positive-preserving weighted essential non-oscillatory finite difference scheme and, Compact-WENO hybrid finite difference scheme and other advanced numerical schemes were developed. Combining with efficient acceleration algorithms such as adaptive mesh refinement method, adaptive mesh enlargement method and MPI parallel computing method, a high order accurate finite difference solver for hazardous chemical explosion was independently developed by Fortran language. Using C++ language based on object-oriented programming method, the pre-processing and post-processing modules for finite difference scheme were developed. Integrating high order accurate solver, pre-processing and post-processing modules, large-scale high order accurate simulation software for hazardous chemical explosion was carried out. The results show that the software can simulate the chemical reaction model containing any kind of components, and has a variety of turbulence and turbulent combustion models. It can realize the numerical simulation of the whole process of hazardous chemical leakage-diffusion-explosion.

    Study on information highlighting of data graph in nuclear power plant monitoring display interface
    WU Xiaoli, YU Shikang, LIU Zhiyao, FENG Huihui, ZHANG Ke
    2022, 32(9):  29-36.  doi:10.16265/j.cnki.issn1003-3033.2022.09.1251
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    In view of the influence of information salience on the visual search task performance of operators in the digital monitoring and display interface of nuclear power plants, firstly, the graphic symbols of nuclear power interface data were taken as the research object.The graphic symbol shape encoding salience was taken as the variable. The influence of graphic symbol shape salience with consistent topology and topological difference on visual search performance was mainly studied. Then, the shape coding of data symbols was designed from the graphic attributes such as adjacency state, connection mode and constituent element type.The psychological behavioral response test was carried out. The experimental results show that there is significant impact on visual search performance in different data graphic symbol shape encoding highlights in the monitoring display interface. Single arc shape highlights promote the low visual search performance of subjects. Topologically different graphic symbol shape encoding highlights can improve the visual search performance of operators.

    Review on safety analysis methods and evaluation techniques of building structures
    SUN Shuli, HAN Xudong, CHEN Pu
    2022, 32(9):  37-48.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2621
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    In order to provide suggestions and references for technology and industry development in the field of building structure safety analysis and assessment, technology development trend and software application in the relevant fields were summarized by using literature research and gathering expert opinions, considering that building structure safety is related to daily life and production activities of the general public. The results show that although safety analysis technology in this field has been developed to a certain extent in theoretical methods, simulations and experiments, it is not yet well enough to meet the needs of risk assessment and emergency management. In terms of industry development trend, there is still a lack of a unified, universal and intelligent safety analysis and evaluation system platform. At present, the research in this field starts relatively late in China and lags behind foreign countries in related technology and software industry, which calls for integration in scientific research, enterprises and policies for technological breakthroughs.

    Integrated analysis method of functional safety and cyber security of avionics system for civil aircraft
    ZHAO Changxiao, WANG Kenian, ZHANG Wei, DONG Fangzheng
    2022, 32(9):  49-56.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2126
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    In order to improve safe operation abilities of aircraft in networked environment, and address problems of unintended risks caused by fragmentation of functional safety assessment and information security analysis of existing avionics system of civil aircraft, based on dual "V" model of civil aircraft system's security analysis, with mapping relationship between functional failure status category and information security threat status level as an integration point, correlation between integrated safety analysis activities and avionics system development process was analyzed with information security risk being taken as a new cause factor for functional abnormalities in combination with current safety assessment process. The, an integrated analysis method of airborne avionics system's functional and cyber security was proposed. The results show that the method has obvious differences in five aspects, such as concerns and risk attribution, and it considers impacts of functional safety and information security on aircraft, crew and passengers, and integrates analysis of functional safety and information security at each link of double "V" model, so as to effectively improve integrated functional safety and information security of avionics system.

    Smart emergency management system in wind farms and its application: 5G technology empowerment
    CHANG Dingyi, SHI Juan, QU Lili, ZHENG Peng
    2022, 32(9):  57-67.  doi:10.16265/j.cnki.issn1003-3033.2022.09.0170
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    In order to prevent emergencies in wind farms and improve their intelligent emergency management capabilities, based on analysis of intelligent wind farm, 5G technology and emergency management from a perspective of combining the technology and management, emergency management system was analyzed from aspects of concept, target, subject, object, technology, system and resources of seven elements. Then, overall "seven horizontal and four vertical" emergency management system structure and 5G emergency management communication network architecture were put forward, and enabling role of 5G and other emerging technologies in information platform construction, drone inspection, video surveillance, unsafe behavior monitoring, emergency data transmission and remote diagnosis was discussed. The results show that 5G and other emerging technologies are suitable for the construction of smart wind farms, and the technology ecology has a wide range of application in the emergency management, which can promote the transformation and upgrade of smart emergency management in wind farms.

    Work safety accident visual reconstruction system based on 3D digital technology
    REN Yanqing, CHEN Zhigang, WANG Haojie, YAN Li, LI Yongjuan
    2022, 32(9):  68-75.  doi:10.16265/j.cnki.issn1003-3033.2022.09.0094
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    In order to solve the problem of visual and realistic reconstruction of work safety accidents and improve the effect of warning education, the current research created a system for work safety accident reconstruction by utilizing 3D digital technologies including a dynamic rendering engine for 3D graphics, dynamic parametric modeling, and script-driven dynamic simulation of accident reconstruction. Based on 30 typical work safety accidents, the visual reconstruction of work safety accidents was realized by building a 3D scene database and a 3D simulation emergency drills system, to create 3D accident training materials for warning and instruction. The system was implemented in a Chinese central state-owned company to improve safety culture and staff awareness and competence. The outcome demonstrates that the system can successfully reconstruct the accident process and important elements in a visual manner.

    Public safety
    Overview of development of public safety-oriented meteorological monitoring, forecasting and early warning software
    ZHOU Yong, YANG Bo, TANG Wei, LI Yue'an, WANG Yuedong, LI Zechun
    2022, 32(9):  76-85.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2649
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    In order to promote the high-quality development of MMFW software, and protect national security and the safety of human life and property, the domestic and foreign MMFW software were summarized and evaluated. Firstly, the categories of MMFW software were analyzed, and the status and key core technologies of six types of software, including meteorological observation system, numerical forecast, forecast and early warning of meteorological disasters, impact and risk assessment of meteorological disasters, public meteorological service and meteorological information system, were studied. Then, the developing trends of MMFW software in the fields of intelligent observation, intelligent forecast, risk assessment and decision-making service technology, and artificial intelligence technology application were preliminarily discussed. Finally, suggestions were put forward. Results show that there are some problems in Chinese MMFW software, such as backward basic software, weak application support software, low technical content of applied software. The short board of the development environment, development tools and other basic software and application support software should be completed. The advantages of the business operation, monitoring software, and other application software should be built. MMFW information products and technical support services should be optimized. Research and development of the key core technologies of "seamless-be full covered, automatic-intelligent, fine-digital" MMFW software should be accelerated.

    Spatiotemporal concomitant analysis and epidemic control strategies for commuter pedestrian flow in campus
    MA Jian, LI Huiwen, SONG Dandan, CHEN Juan
    2022, 32(9):  86-93.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2737
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    In order to prevent the spread of the epidemic due to the frequent movement of students, densely populated colleges and universities are under pressure during the normalization stage of epidemic prevention and control. A typical scene of student flow in college campuses was selected, and a pedestrian flow model on campus was built in this paper. By introducing the concept of spatiotemporal concomitant, the risk of epidemic transmission caused by pedestrian-to-pedestrian contact was quantified. Based on the spatiotemporal concomitant indicators, simulation calculations were carried out for three campus epidemic prevention and control strategies in Xipu Campus of Southwest Jiaotong University, including opening all passageways in the dormitory park, designing a new road between different areas, and classes in batches. Comparing and analyzing the simulation results, it can be found that the declines of the spatial concomitant indicators of the three strategies are: 12.12%, 6.08%, and 74.02%, and the declines of the temporal concomitant indicators are 30.49%, 0.16%, and 60.78%, respectively. When the three strategies are implemented at the same time, the declines of the spatial concomitant indicators and temporal concomitant indicators are 82.37% and 76.63% respectively.

    CA model considering environmental familiarity and evacuation strategy
    HUO Feizhou, LI Ying, MA Yaping, TU Wenhao, LIU Chang, YAN Yan
    2022, 32(9):  94-99.  doi:10.16265/j.cnki.issn1003-3033.2022.09.1735
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    In order to clarify the influence of environmental familiarity and evacuation strategy on pedestrian evacuation process, CA model considering environmental familiarity and evacuation strategy was established by introducing pedestrian transformation rules into the static field model. The model divides pedestrians into familiar environment and unfamiliar environment, and considers the influence of environmental familiarity on evacuation process. Then, two evacuation strategies and pedestrian transformation rules are simulated to discuss the effects of blind evacuation, rational evacuation and changing the probability of pedestrian transformation on evacuation under different visibility. The results show that environmental familiarity affects evacuation efficiency, and environmental familiarity is proportional to evacuation efficiency. When the pedestrian density is small, the visibility has a great influence, the best visibility is 11(4.4 m). If the visibility is greater than 11(4.4 m), rational evacuation should be selected. If the environmental familiarity is constant, the increase of conversion probability will reduce the evacuation time, and the optimal conversion parameter is 0.01.

    Review of pedestrian and traffic evacuation simulation software
    LIN Zhiyang, LIU Zheng, FANG Zhiming, LIU Jialin, ZHANG Peng, JIANG Rui
    2022, 32(9):  100-110.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2993
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    In order to find out the development direction of pedestrian and traffic evacuation simulation software with independent intellectual property rights, the existing mainstream software was sorted out and the problems and key technologies of software development were put forward. Firstly, the development status of pedestrian and traffic evacuation simulation software was introduced, the mainstream software at home and abroad were compared in terms of underlying model, functionality and expandability. Then, judgment rules of the technical level of software and the level of independent intellectual property rights were introduced, and the problems and difficulties in the development of pedestrian and traffic evacuation simulation software were clarified. Finally, the application and impact of pedestrian and traffic evacuation simulation software were introduced. Strategic requirements, objectives and key frontier technologies for software development were proposed. The results show that pedestrian and traffic evacuation simulation software is widely used, and there is still a big gap between domestic software and foreign mainstream commercial software. The underlying model of mainstream commercial software cannot be changed and the application scenarios are limited, so it is necessary to do research on self-developed simulation software of pedestrian and traffic evacuation.

    Pedestrian evacuation model considering panic and wall-following guidance
    WANG Guanning, CHEN Tao, ZHENG Huijie, JIANG Wenyu
    2022, 32(9):  111-117.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2675
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    In order to investigate the guidance effect on evacuation under a limited visibility environment, an extended cellular automaton model was put forward to study the panic evacuation behavior and the influence of wall-following guidance on evacuation. First, a dynamical model of panic evacuation was established, considering wall-following guidance. Second, the dynamic process of crowd evacuation in the presence of a hazard source was simulated when a rescuer adopted the wall-following strategy. Finally, the influence of pedestrian panic degree and hazard position scheme on evacuation was analyzed. The simulation results show that the higher the degree of panic, the more sensitive pedestrians are to the hazard, and the less able to rationally search for exits, leading to blindly following and gathering in corners. The guidance of rescuers can effectively curb the spread of panic, ease the crowd's panic, and improve evacuation efficiency. When the hazard is closer to the exit, the panic will have a greater impact, and the evacuation time will be longer. However, the guidance of rescuers can significantly improve evacuation efficiency, and especially when the hazard is closer to the safety exit, the rescuer guidance efficiency is even more remarkable. Under the limited visibility circumstance, with the influence of panic, pedestrians are more inclined to evacuate along the wall. Unsafe behaviors appear, such as blindly following and gathering in corners. The "Wall-following" guidance promotes rational evacuation behaviors and significantly improves evacuation efficiency.

    Application and progress of software in urban flood risk assessment
    ZHENG Anna, LI Jianwei, CHEN Sixi, GUO Wei, CHEN Xiaomeng
    2022, 32(9):  118-125.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2721
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    In order to study application status and progress of software in urban flood risk assessment, and explore its development prospects, firstly, application of Hadoop software in scientific calculation and data processing, use of SWMM, MIKE and InfoWorks in urban flood simulation, and progress of GIS software in risk visualization expression were systematically summarized from aspects of scientific calculation and data processing, urban flood simulation and visual expression. Then, key technologies of software development were discussed through analysis on advantages and disadvantages of different software and their scope of application. Finally, development direction of integrated system of assessment software was summarized, and possible research trends were prospected. The results show that the application and progress of software have expanded the means of urban flood risk assessment. Moreover, integration of key technologies and software will help build a more perfect urban flood management system and provide safety guarantee. And the realization of software autonomy is also the key direction of future research.

    Technology and engineering of disaster prevention and mitigation
    Review on regional seismic analysis software
    CHEN Yongqiang, WU Zhipeng, YANG Xiangjuan, CHEN Pu, SUN Shuli
    2022, 32(9):  126-136.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2808
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    In order to strengthen the capabilities of disaster prevention, mitigation, disaster resistance, and disaster relief, it is necessary to study the technology of rapid calculation of earthquake and rapid information reporting, and realize the rapid analysis of the earthquake response of the structure, which provides an important guarantee for public safety rescue. Firstly, seismic analysis software's current status and development trend were introduced, and the main commercial and open source software widely used in China and abroad were systematically sorted out. Then, the self-developed regional seismic dynamics numerical simulation platform EQSDA(Earthquake Simulation and Damage Analysis) and its four major modules were explained in detail, i.e., equivalent source restoration, ground seismic response analysis, community building seismic response analysis, and progressive damage analysis of building structures. The theory and techniques used in each module were illustrated, respectively. Functions of each module were demonstrated through calculation examples. The results show that the advanced seismic wave numerical simulation method combined with machine learning technology can be used to carry out the numerical simulation research of earthquakes and strong ground motion, so the full-chain analysis from the source analysis to the earthquake simulation calculation and the building structure failure simulation can be realized more accurately.

    Review on application of cutting-edge information technology in urban flood prevention system
    LI Haichen, FENG Wenwen, ZHANG Shaokai, WANG Chao, ZHANG Peng, LEI Xiaohui
    2022, 32(9):  137-143.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2707
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    In order to comprehensively understand the application status of cutting-edge information technology in urban flood disaster prevention in China, promote the construction of smart platform for urban flood disaster prevention, strengthen the application of cutting-edge information technology, and improve the urban ability of urban flood disaster prevention, this paper systematically reviews the research status and application of urban flood prevention system and various new technologies, points out the problems existing in the application of new technologies, such as imperfect monitoring data, poor multi-source data fusion and low level of intelligence, and look forward to the future development trend, and puts forward suggestions such as strengthing the localization of urban flood simulation software, intelligentizing flood defense system, and paying attention to the advantages of big data and the Internet of Things in basic data collection. The results show that the application of advanced information technology can significantly improve the urban flood disaster prevention ability. It is necessary to strengthen the construction of the smart platform of the urban flood disaster prevention system. Big data technology and Internet of Things technology are the most critical basic technologies, which play an important role in improving the monnitoring and early warning system of urban flood disaster. Localization of software products is the focus of the next research and further development.

    Spatial-temporal evolution and obstacle factors of urban disaster resilience in Zhongyuan urban agglomeration
    LI Mengjie, LIU Delin
    2022, 32(9):  144-151.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2072
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    In order to enhance urban disaster resilience, this paper studied the urban disaster resilience of Zhongyuan urban agglomeration from a dynamic perspective. Firstly, the evaluation index system of urban disaster resilience was constructed from four aspects: infrastructure resilience, economic resilience, social resilience and ecological resilience. Secondly, the weight of each index was calculated by the entropy method, and the evaluation model was established by the comprehensive index method. Finally, ESDA and obstacle degree model were used to reveal the temporal and spatial differentiation characteristics and obstacle factors of urban disaster resilience in Zhongyuan urban Agglomeration from 2003 to 2019. The results show that during the study period, the urban disaster resilience level of Zhongyuan urban Agglomeration shows a sustained growth trend, showing an obvious regional imbalance and uncoordinated phenomenon, which is mainly manifested in the spatial distribution pattern of high in the central region and low around. On the whole, urban disaster resilience shows a positive spatial correlation, and the spatial agglomeration mode is mainly low-low agglomeration and high-high agglomeration. The obstacle factors were mainly focused on economic and social aspects.

    Forest fire risk prediction model based on machine learning
    ZHU Xin, LI Jianwei, GUO Wei, BI Sheng, WU Yuefei
    2022, 32(9):  152-157.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2729
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    In order to reduce the damage caused by forest fires, the forest fire risk was modeled and predicted through a literature review. This paper summarizes the research status of forest fire risk prediction based on the machine learning method, and analyzes and expounds on the selection of forest fire impact factors, the selection of appropriate fire risk prediction models and the model test methods. The results show that the main influencing factors of forest fire risk include the characteristics of combustibles, meteorological factors, terrain, human activities, etc. In the forest fire risk prediction model, the back propagation(BP) neural network method needs to be improved and applied. The SVM method requires high data, the random forest(RF) method has strong universality and high accuracy, and the deep learning method has less research, but the accuracy is high. The commonly used test methods of the model are accuracy, receiver operating characteristic(ROC) curve and area under curve(AUC) value.

    Emergency technology and management
    Mine intelligent ventilation and disaster emergency decision platform
    WEI Lianjiang, ZHOU Fubao, XIA Tongqiang, WANG Kai, JIANG Heguo, WANG Jian
    2022, 32(9):  158-167.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2817
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    In order to ensure the reliable and economical air supply on demand of the mine ventilation system, realized the real-time calculation, abnormal diagnosis, disaster judgment and air flow emergency control of the mine ventilation network, deeply analyzed the principle and software architecture of MIVDEDP, proposed the MIVDEDP software architecture, discussed the communication mode and data storage method of multi-source data collaborative fusion, and proposed the real-time calculation method of the mine ventilation network. The three-dimensional visualization MIVDEDP was developed and tested in Yangchangwan coalmine of national energy group, Fucun coalmine and Zhuanlongwan coalmine of Shandong energy group. The results show that the research and development of MIVDEDP can realize the real-time calculation and abnormal intelligent diagnosis of mine ventilation network, disaster judgment and air flow emergency control.

    Review on development of simulation software technologies for emergency rescue in complex disaster scenarios
    CHEN Bin, WANG Xianghan, YANG Mei, QIU Xiaogang
    2022, 32(9):  168-175.  doi:10.16265/j.cnki.issn1003-3033.2022.09.0356
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    In order to enhance resilience of society to complex disasters, assist decision makers to formulate emergency management plans and efficiently carry out post-disaster rescue works, simulation tests and analysis of complex disasters were carried out based on simulation software. Firstly, simulation software technologies for emergency rescue in complex disaster scenarios were introduced in general with the scenarios being divided into four categories, i.e., natural disasters, accidents disasters, public health disasters and social security disasters. Then, typical simulation software technologies in these four scenarios were introduced respectively, and relevant researches at home and abroad were compared. The results show that compared with software in foreign countries, domestic one has a certain gap in technology and application scale, and relevant practitioners need to make up it from three aspects, which is core technology, industry scale and legal policy, to realize a role transformation from following to leading one in this field.

    Emergency material distribution and transportation optimization model considering altruistic behavior of disaster victims
    WANG Zhiying, FU Hanxue, NIE Huifang, CHANG Zhipeng
    2022, 32(9):  176-181.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2694
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    In view of the realistic problem that the victims had empathy and altruistic behavior spontaneously after emergencies, a multi-objective optimization model of emergency material distribution and transportation considering the altruistic behavior of victims and regret theory was constructed to optimize the distribution and transportation process of materials from the perspective of victims. Firstly, considering the reality of material shortage in the disaster area and the behavior conditions of the victims ' neighborhood mutual assistance, the unmet amount of material distribution was minimized in the process of emergency materials distribution. Secondly, in the process of emergency material transportation, the perceived utility function was obtained by using the regret theory and the transportation cost is minimized.. Finally, NSGA-II algorithm was used to analyze the actual case. The results show that the optimization model takes into account the altruistic behavior of the victims and gives emergency supplies to more need people, which helps to improve the utilization rate of supplies, alleviate the pressure of the disaster area and make the distribution of supplies more reasonable.

    Key technologies of emergency management informatization for forest fires
    JIANG Wenyu, WANG Fei, SU Guofeng, LI Xin, MENG Qingxiang, WANG Guanning
    2022, 32(9):  182-191.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2693
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    In order to comprehensively and efficiently assist emergency management agencies to carry out forest fire prevention, control and response actions, an independent "Forest Fire Early Warning and Emergency Command System" was developed to cover the whole process of emergency management based on comprehensive elements like "prevention" and "rescue" as well as multi-agent collaboration needs. In consideration of important steps of risk assessment, monitoring and early warning, emergency response and case review, this system developed various independent algorithm models with its focus on key information technologies such as multi-scale dynamic risk assessment, air-space-earth integration monitoring and early warning, forest fire spread prediction, and timestamp-based visual case review. The system had been applied in many places such as Guangdong province and Zhejiang province, which played an important role in emergency command of many forest fires. The results show that it can achieve informatization management of the whole forest fire process, provide independent intelligent assistant analysis services in critical aspects of emergency management, which significantly improves the modernization capability of government emergency agencies in prevention and response to forest fires.

    Construction of emergency supplies dispatch mode based on block chain Fabric
    LI Xiteng, WANG Lin, QIN Hongnan, WANG Baoqing, LI Xin
    2022, 32(9):  192-199.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2213
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    In order to improve the efficiency of emergency material dispatching under emergencies, standardize the behavior of all parties in the process of emergency material dispatching. Firstly, the problems of information island and rent-seeking in traditional material dispatching are pointed out, and the application value of blockchain Fabric in emergency material dispatching is analyzed. Secondly, a set of operation mode of emergency supplies based on privacy technologies such as intelligent contracts and consensus mechanisms is constructed to describe the specific operation in four links of emergency supplies reserve, transportation, donation and supervision. Finally, the functional elements of service layer and information collection layer are analyzed, and the implementation path of the operation mode is expounded from three dimensions of human-computer interaction, human-computer interaction and machine-computer interaction. The results show that compared with the traditional emergency material dispatching mode, the emergency material dispatching mode based on Fabric is more scientific and reasonable, and the emergency material information in the dispatching process is always in an open and transparent state.

    Occupational health
    Fatigue safety resilience model of assembly line work and its application
    LI Xin, YANG Fuqiang, HONG Yidu, DUAN Zaipeng
    2022, 32(9):  200-205.  doi:10.16265/j.cnki.issn1003-3033.2022.09.2056
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    In order to improve the safety level of assembly line work and solve the fatigue hazard of workers in assembly line work, the influencing factors of fatigue were analyzed with fault tree analysis (FTA) method, and the fatigue safety resilience model of workers was constructed. The model consisted of three modules: management system, fatigue repair and man-machine system. The model runs continuously in four stages of resistance, recovery, learning and optimization. Based on the practical application of the model, the fatigue management redundancy system was constructed, and the approximate and accurate rest mechanism and the conveyor belt alarm system were proposed. The results show that the fatigue management redundancy system has the function of monitoring and feedback information, and can prevent the fatigue damage of the factory. The fatigue repair method can approximately or accurately determine the rest time, and can avoid fatigue in the same posture. Optimizing human-machine systems can improve human factors reliability and environment. The model can eliminate the hazards of long-term work in the same-position, reduce fatigue and effectively solve the fatigue risk of the factories.