China Safety Science Journal

Deep learning method for processing pan-scene data on construction safety

TONG Ruipeng, CHEN Ce, CUI Pengcheng, FU Gui, AN Yu

2017, 27(5): 1-6. doi:10.16265/j.cnki.issn1003-3033.2017.05.001

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In order to identify potential accidents at construction scenes and process the pan-scene data on construction safety intelligently, the construction scenes were divided into two groups, unsafe behavior scenes and unsafe state scenes, on the basis of the scene factors. Using deep learning method, the object semantics, spatial relation semantics, scene semantics and behavior semantics were extracted from the pan-scene data on the basis of the division of image semantics hierarchies. Then, the correspondences were obtained between image semantics and the pan-scene data according to the theory of pan-scene data on construction safety. Building construction site photos were collected as the sample source to acquire the scene data of unsafe behavior in construction, and the feasibility of processing the pan-scene data by using a deep learning method was validated by analyzing the scene data of unsafe behavior in construction. The result shows that the pan-scene data can be acquired antomatically and processed efficiently through extracting the image semantics with a deep learning method.

Analysis of topics structure and frontier of safety science

LI Jie, YANG Mian, WU Chao

2017, 27(5): 7-12. doi:10.16265/j.cnki.issn1003-3033.2017.05.002

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To analyze the development and frontier of safety science research, papers in China Safety Science Journal and Safety Science among years 2006-2015 were chosen as the data samples. The high frequency terms were extracted from the English titles and abstracts of the papers, and analyzed by using mapping and clustering methods from VOSviewer. The authors have come to the conclusion that in the past ten years, China's safety science research paid close attention to the themes of enterprise safety, coal, and explosion and organization supervision, that the themes can be classified into five large groups and they are the safety life science, the safety natural science, the safety technology science, the safety social science and the safety system science, and that the international safety science research has shown more social science attributes.

Research on mode of safety culture development in context of “Internet+”

HUANG Xi, WANG Bing, WU Chao

2017, 27(5): 13-18. doi:10.16265/j.cnki.issn1003-3033.2017.05.003

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In order to promote the development of safety culture and enhance national safety cultural quality, based on the definition of “Internet +”, a definition of “Internet + safety culture” was proposed from the perspective of safety culture construction. According to the six-occasion communication theory of information dissemination, a six-occasion safety culture propagation model of “Internet + safety culture” was built. And based on this, a model was proposed for “Internet + safety culture” construction which is guided by the Internet thinking, and a safety culture construction frame of “Internet + safety culture” was presented. Concrete optimization paths of safety culture construction in the context of “Internet +” were studied. The results show that the Internet users' group is the core part in safety culture propagation in the context of “Internet +”, and that the construction of safety culture should be optimized along four specific paths, such as improving the construction of safety culture websites, broadening network communication channels of safety culture, promoting the construction and innovation of safety cultural online industries and establishing capacity evaluation system for safety culture communication.

Impacts of grassland highway landscape elements on driver's eye movement indices

SHANG Yan, ZHU Shoulin, QI Chunhua, GAO Mingxing, ZHAO Ting, WANG Yuhua

2017, 27(5): 19-24. doi:10.16265/j.cnki.issn1003-3033.2017.05.004

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For the sake of studying the influence of the complexity of the landscape elements of grassland highway on the eye movement index of the driver, field tests were carried out, 5 participants' blink duration, fixation duration, the pupil diameter and scanning amplitude were collected on a grassland highway having three landscapes. The eye movement indices were collected by BeGaze2.4 and analyzed by SPSS. The relationship between the three landscape elements and the eye movement index was established and the variation law was analyzed. The results of the analysis were verified by a subjective questionnaire survey. The results show that the increase of landscape elements makes both the drivers' fixation duration and blink duration reduce,but makes both the pupil diameter and scanning amplitude increase slightly. Compared with the landscape a and c, landscape b can increase more grassland highway driving comfortableness, reduce the negative emotions.

Research on pedestrian crossing decision without signal control

ZHAO Jia, SONG Zhu, ZHANG Mingfang, WANG Chang

2017, 27(5): 25-30. doi:10.16265/j.cnki.issn1003-3033.2017.05.005

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In order to study the traffic characteristics of pedestrian crossing the street without signal control further, data on motion of incoming vehicle during the process of pedestrian crossing the street were collected by using a Lidar, and effects of external factors on pedestrian crossing decision and those of the psychological needs of pedestrians on safe crossing were taken into consideration. The parameters, including the distance between the pedestrian and the incoming vehicle, the velocity of the vehicle and the gap for crossing, were analyzed for two decision results, crossing directly and crossing after waiting. The above parameters were used to build a psychological distance model for the pedestrian crossing the street safely and a multivariate Logistic regression decision model. The effectiveness of the two models was evaluated. The results show that the probability of crossing the street for the pedestrian increases when the distance between the pedestrian and the incoming vehicle grows, the velocity of the vehicle decreases, and the gap of crossing becomes larger, that with the same gap of crossing, as the velocity grows, the probability of crossing gets larger, that the effectiveness of the models is great, and that the research results can provide a basis for the optimization of the on-board pedestrian warning system.

Research on optimal combination model for forecasting traffic accident

SONG Yinghua, CHENG Lingxi , LIU Dan, LYU Wei

2017, 27(5): 31-35. doi:10.16265/j.cnki.issn1003-3033.2017.05.006

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To predict death toll caused by traffic accident accurately,a UGM(1,1)-Holt combination forecasting model was built by using the entropy method, and the Markov model was improved by introducing the slide transition probability thinking into it to realize optimization of combination forecasting. Finally, Hubei traffic accident death toll in 2012-2014 was predicted, and a comparison of 4 models' predicted values with the measured value was made. The results show that mean relative error(MRE) of the optimal combination forecasting model's fitted value is further reduced to 0.451 0%, MRE of predicted values of 2012-2014 reduced to 1.25%, and that the model can gain advantages of the single models, and can ensure greater prediction accuracy.

Comprehensive evaluation model of freeway traffic safety considering subjective and objective factors

CHEN Jie, HU Qizhou, ZHU Yun

2017, 27(5): 36-40. doi:10.16265/j.cnki.issn1003-3033.2017.05.007

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In order to accurately evaluate the level of freeway traffic safety, this paper analyzed the characteristics of accidents on freeway and the factors affecting the freeway traffic safety, established an evaluation index system for freeway traffic safety, and constructed a comprehensive evaluation model based on hierarchical entropy and a comprehensive evaluation model based on vector similarity. The hierarchical entropy evaluation model used the analytic hierarchy process(AHP) and the entropy weight method to determine the subjective and objective weights of the evaluation indexes, the weighted average of the index data and the evaluation results. The vector similarity evaluation model used the vector similarity degree to analyze the traffic safety status of the freeway and conduct a comprehensive analysis. The two models were used to evaluate the traffic safety level of the freeway in Jiangsu Province. The results show that the traffic safety level of freeway in Jiangsu Province is high and the evaluation results are consistent with the actual situation.

Research on generalized safety structure theory

JIN Zhixin, WANG Yansheng, DENG Cunbao, GUO Sicong, ZHANG Xun

2017, 27(5): 41-46. doi:10.16265/j.cnki.issn1003-3033.2017.05.008

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In order to strengthen the study of safety science and safety engineering theory, based on the bioinformatics and the factor space theory, a generalized safety structure theory was worked out, and essential laws of safety issues were clarified, components of the safety structure and mathematical logic analysis frameworks of the components were studied, in addition, the composition and construction process of the active safety control system were given. The results show that the safety is the structural form formed by the interaction between human or material activities and activity environment,that the changing law of structural form is the essence law of the beginning, occurrence and evolution of safety issues,that the safety structure is composed of four elements: safety events structure, environment structure, activity structure, interaction mechanism between activity and environment,and that the paradigm of active safety control system is composed of five parts: environment factors attribute space, activity factors space, information space, system external factors, safety control and the association (mapping) between the parts.

Experimental study on spreading characteristics of jet fuel spill fire

LIU Quanyi, YANG Rui, ZHANG Hui

2017, 27(5): 47-51. doi:10.16265/j.cnki.issn1003-3033.2017.05.009

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An experimental platform was designed and built for aviation fuel spill fires. Experiments were carried out for the sake of ensuring the safety of jet fuel storage and transportation and fire safety in airports. Jet fuel (JP4) was selected as the fuel in the continuous spill fire for four different leaking rates based on the rotation of the peristaltic pump. Parameters were measured, including the flame front location, burning area, spreading rate, as well as the spill fire videos recorded. The variations of the typical characteristic parameters were analyzed according to the experimental phenomena. The results show that there is a stable linear burning rate of 3.71×10^-5 m/s and an increase of 5.5 mm/s for initial spreading rate with the increase of leaking rate for JP4, and that there is a positive correlation between the typical characteristic parameters and the leaking rates.

Study on condition for establishing disaster ventilation system in emergency rescue station between tunnel portals

LI Qi, YU Li, WANG Mingnian

2017, 27(5): 52-57. doi:10.16265/j.cnki.issn1003-3033.2017.05.010

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In order to set reasonably disaster prevention and ventilation systems for emergency rescue stations for a given long railway tunnel group from the point of view of disaster prevention and rescue, effects of train fire smoke on the environments in the adjacent tunnels were studied by means of model tests and numerical simulation. The results show that within the range of 20 m from the fire source point, the smoke has a great influence on the environmental temperature and visibility, but there is almost no effect on the region more than 50 m away from the fire source point, that when the distance between emergency rescue station and tunnel portals is greater than 250 m, the train fire smoke has almost no effect on the tunnel environment and there's no need to set a disaster prevention and ventilation system considering the length of the fire source, the fire train parking error, the influence range of the smoke and other factors, and that when the distance is not greater than 250 m, a disaster prevention and ventilation system should be set.

Flame characteristics of deposited coal powder explosion induced by high-pressure airflow carrying coal dust

LI Yucheng, LIU Tianqi, ZHOU Xihua, LIU Rongzheng

2017, 27(5): 58-63. doi:10.16265/j.cnki.issn1003-3033.2017.05.011

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In order to study flame characteristics of combined explosion of coal dust carried by high pressure airflow and induced deposited coal powder, experiments were carried out on samples of the lignite, long flame coal, non-stick coal and gas coal by using a horizontal glass tube test device. Effects of the mass of deposited coal powder(m), the particle size of deposited coal powder(r) and the mass of CaCO\-3 mixed with deposited coal powder(k) on flame characteristics of combined explosion, the longest distance of flame propagation(l) and the duration of flame(t)were studied. Study result shows that with the increase of m in the range of 0-4.5 g, l and t of four kinds of coal dust increase first and then decrease, after l and t reach the local maximum value, they begin to decrease, that for these four kinds of coal dust, l decreases slowly with the increase of r, that the maximum values of l are 106, 73, 37 and 22 cm respectively. t\-3 and t\-4 increase with the increase of r, even when r> 40 μm and that when k=6 g, the inhibitory efficiency of lignite and long flame coal are 62.5% and 79.7% respectively, while the non-stick coal and the gas coal are no longer explosive.

Numerical simulation of steel floating-roof storage tank destruction under blast impact

LU Shengzhuo, CHEN Weidong, WANG Wei, ZHANG FengchaoMA Jingxin, SHI Yaqin

2017, 27(5): 64-69. doi:10.16265/j.cnki.issn1003-3033.2017.05.012

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For the sake of exploring the damage mechanism of steel storage tank with a floating roof under the blast impact, the process of structural failure and changes in interal forces were researched through theoretical analysis, scaled model test and numeical simulations. It is found that the tank walls produce a great compressive internal force in the circumferential direction, because of the instantaneous impact. Besides, the upper area yields and the tank body loses its stability, as well as a concave and buckling region appears in the structure in the process of approaching elastic-plastic response. Moreover, the tensile (or compressive) stress and stress giving birth to bending moment are main internal forces, but the effect of tensile (or compressive) stress is much obvious. The walls form a compressive state and a tensile state in their circumferential and axial directions respectively.

Fatigue risk evaluation model and system for civil aviation maintenance personnel

WANG Lei, REN Yong

2017, 27(5): 70-75. doi:10.16265/j.cnki.issn1003-3033.2017.05.013

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For the sake of evaluating fatigue risk of civil aviation maintenance personnel in a quantitative way, firstly an evaluation index system of fatigue inducing factors was developed based on Delphi method and a fatigue risk evaluation model for aviation personnel was built based on the gray clustering principles. Then the practical data were collected from a certain maintenance company and a case study was conducted for validating the model. Finally, the model was integrated into the development of a fatigue maintenance management system where the electronic questionnaire processing and the automated calculation process were realized. The findings of this study indicate that this gray clustering model could be used to quantitatively evaluate fatigue risk of maintenance personnel and the system could be used by maintenance organizations as a practical tool for fatigue risk management.

Airport hotspot recognition method considering spatial and temporal overlap of aircraft taxiing track

XIA Zhenghong, WAN Jian, ZHU Xinping

2017, 27(5): 76-80. doi:10.16265/j.cnki.issn1003-3033.2017.05.014

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For the sake of studying aircraft taxiing conflicts in the big airports without aerodrome surveillance radar, aircraft taxiing conflict models were built, and an airport hot-spot identification method taking into account spatial and temporal overlap of aircraft taxiing tracks based on ADS-B data. Effects of both the heading difference threshold and the distance threshold on the hotspots were studied. The proposed method was used to identify hotspots in a certain airport in the southwest of China. The results show that the method of hot-spot identification based on taxiing track of spatial and temporal overlap can be used to identify hotspots effectively.

Building and analyzing model for measuring risk in nuclear power plant construction

LI Jielin, LIU Weijie, LIU Hanwen

2017, 27(5): 81-86. doi:10.16265/j.cnki.issn1003-3033.2017.05.015

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For the sake of evaluating the safety status of engineering construction of nuclear power station scientifically and rationally and finding potential safety hazard in the construction process, a risk measurement and evaluation system of nuclear power plant construction and a membership function grade table of nuclear power station construction safety condition were established. A risk measurement model was built for engineering construction of nuclear power plant based on Analytica software. The model was applied to the risk assessment of the engineering construction project of 1-4 safety building and nuclear island project of a certain nuclear power plant. The results show that the evaluation results obtained by using the conform with the actual situation, and the model can be used to judge the risk category and calculate the quantitative value of risk category, then make targeted countermeasures.

Status quo of and progress in research on LNG ship maritime transport safety

NIE Xiliang, LIU Qiang, LI Guoshuai, DAI Ran

2017, 27(5): 87-92. doi:10.16265/j.cnki.issn1003-3033.2017.05.016

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To keep LNG ships safe during navigating, loading and unloading, the data on LNG ship accidents were statistically analyzed and the related literatures were reviewed. The analysis reveals that the researches on LNG ship maritime transport safety in the existing literatures mainly focused on six fields, including LNG ship security zone settings, channel adaptation and channel performance, anchoring and mooring, LNG ship handling, LNG leak consequence modeling analysis, and risk identification and safety assessment,that most of the current methodologies incorporate mathematical models, and are gradually developing towards quantification analysis, that simulation and test data are used fully, which can enhance the reliability,that further improvement and expansion are needed for these models to form an intelligent safety evaluation terminal,and that changes in both LNG ships and their loading way will bring new problems of safety, to which a great deal of attention should be paid.

Leakage risk analysis of water-submerged natural gas pipelines in absence of data

YU Xuchao, LIANG Wei, ZHANG Laibin, WANG Rui

2017, 27(5): 93-98. doi:10.16265/j.cnki.issn1003-3033.2017.05.017

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For the purpose of quantifying the leakage risk of water-submerged natural gas pipelines under the condition of missing data, a probabilistic risk analysis method based on BN and FST was worked out. First, causation analysis was carried out for leakage failure by using FTA. Then, a corresponding BN model was obtained through mapping. In view of the absence of basic failure probabilities into account, probabilities were elicited from expert knowledge to substitute the missing statistical failure probabilities. To handle the uncertainty caused by the ambiguity and subjectivity of expert knowledge, FST and multi-expert AHP were combined to elicit fuzzy probabilities, as the practical prior probabilities to be inputted into the BN model for quantitative analysis. The proposed method was applied to a water-submerged dual natural gas pipeline for leakage risk analysis. The result shows that the method can be used to characterize and quantify the leakage risk in the absence of data, and that the dynamic risk assessment and the identification of critical failure factors can be realized by utilizing the forward prediction and probability update abilities of BN.

Study on formation mechanism of blind spot for truck turning right and safety of intersection

WANG Qingzhou, XU Lingxuan, FAN Xin, GUO Kai

2017, 27(5): 99-104. doi:10.16265/j.cnki.issn1003-3033.2017.05.018

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In order to explore the formation mechanism of truck drivers' blind area when the truck is turning right, and the influence of truck turning right on safety of the road intersection, a right-turn model was built by using the Matlab software. Based on analyzing the characteristics of truck's inner wheel difference, the results of test of model car and results of large trucks turning tests, and fixing trajectory turning, the turning process of truck was simulated accurately. A method was worked out for calculating the visual blind area. A index was putforward for road intersection safety evaluation. A truck right-turn blind spot area based evaluation of safety was made for right-turn separation, slow turn interaction and sharp turn interaction. The results show that the blind area is 40.39 m² for six-axle truck turning right, and that right-turn separation crossing has higher safety.

Experimental study on thermodynamic process of coal and gas outburst

WU XIN, LI Ji, LI Guohui, NIE Wen, TU Zihan

2017, 27(5): 105-110. doi:10.16265/j.cnki.issn1003-3033.2017.05.019

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In order to further improve forecasting of major disasters in mines such as coal and gas(methane) outburst, some quantitative studies were carried out on the thermodynamic phenomena in the whole process of coal and gas outburst. Coal samples crushed were pressed and molded in a similar simulation test bed of coal and gas outburst. Adsorption, desorption and coal and gas outburst tests of the coal samples with different particle sizes were carried out. Variation in coal temperature during the test was obtained. The results show that the evolution of coal body temperature can be described by a natural logarithm function in the process of coal and gas outburst, that the coal particle size has a significant effect on the variation in coal temperature, and the smaller the coal particle is, the greater and faster the variation in temperature will be, and that the coal particle size determines the gas adsorption capacity and the gas internal energy, and in turn, the gas internal energy determines the coal and gas outburst intensity to a great extent.

Mechanical characteristics of complex geological structure zone and its effect on gas outburst

GAO Kui, LIU Zegong, LIU Jian

2017, 27(5): 111-116. doi:10.16265/j.cnki.issn1003-3033.2017.05.020

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In order to deeply understand the disasters of coal and gas outburst occurring in the geological structure area, a self-developed simulation experimental device of coal and gas outburst was used to research the stress distribution throughout the complex geological structure zone, the influence of the stress on the gas occurrence and accumulation in the geological structural belt was analyzed, and the mechanical mechanism of the coal and gas outburst in the complex geological structure zone was explained from the view of geology. The results show that the distribution of stress throughout the complex structure zone is complicated, that the concentration positions of the stress are mainly distributed over the area around the turning point along the fracture surface of the reverse fault, and the concentrated stress can reach 1.3 to 1.7 times of the primary rock stress, that in the process of complex structure forming, the coal body structure is seriously damaged and the tectonic coal develops very well,that the stress would facilitate the gas migration to and accumulation in the seam area, making it a enrichment region of high pressure gas, and that both the development of tectonic coal and much gas under the artesian condition create a necessary condition for the coal and gas outburst.

Parameter sensitivity and critical criterion thermal runaway of batch reaction system

JIANG Jiajia, YANG Jianzhou, JIANG Juncheng, PAN Yong, GU Wei

2017, 27(5): 117-121. doi:10.16265/j.cnki.issn1003-3033.2017.05.021

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Batch reaction systems are a nonlinear dynamic system that exhibits parametric sensitivity within a certain operating range. Experiments were carried out on hydrolysis reaction of acetic anhydride with a catalyst of sulfuric acid to study the parameter sensitivity of the batch reaction system under different initial temperature and initial concentration conditions. The critical parameters of the batch reaction system were simulated according to the critical criterion based on traces of Jacobian matrix. The research results show that the small changes in the parameter value will cause drastic changes of temperature when the operating parameters approach the critical value, and that the critical criterion based on traces of Jacobian matrix can accurately predict the critical parameters of the thermal runaway system, the simulation results are in good agreement with the experimental data.

Mechanism of instability of surrounding rock of stope in close distance coal seam group and control technology

LI Jiazhuo, TAN Wenfeng, LI Chuanming, ZHU Chuanqi, MA Haifeng

2017, 27(5): 122-127. doi:10.16265/j.cnki.issn1003-3033.2017.05.022

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For the sake of exploring the mechanism of instability of surrounding rock of stopes in close distance coal seams and developing a technology for controlling the instability, distribution of mining pressure field under coal seam group mining was studied by means of calculation, simulation and laboratory experiments. A mechanical mechanism of water injection reinforcement was illustrated. Comprehensive technical measures of the deep-hole presplitting explosion, the short-hole water infusion at working face and the deep-hole water infusion in haulage roadway and coal mining technology were worked out. The research shows that two working faces influence each other tempestuously, that if the under working face is arranged in the distressed zone of the upper working face, then the original stress of the upper working face can be reduced, that the deep-hole presplitting explosion can be used to avoid the shock to the under working face for the key stratum fracture, that the short-hole water infusion at working face and the deep-hole water infusion in haulage roadway can be used to improve the shear strength of loose coal and the stability of coal wall.

Study on tree-diagram layout algorithm for fault tree automatic synthesis system

KONG Tao, XIONG Yi

2017, 27(5): 128-133. doi:10.16265/j.cnki.issn1003-3033.2017.05.023

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For the purpose of making the automatically generated fault tree-diagram to meet the requirements of tree-diagram aesthetics standards, an algorithm was worked out for automatically generating fault tree drawing layout on the basis of general tree structure principle and tree aesthetic law principle. Initial coordinates, modified coordinates and final coordinates were used to represent the positions of the tree nodes. The relative layout between the sibling nodes was done by the initial coordinates and the overlap circumvention between the nodes was completed by the post-traveled formed modified coordinates. As a consequence, it is showed that the drawn fault tree-diagram has advantages of good visual effects, high space utilization, and friendly user interaction, providing valid diagram visualization and data interaction solutions for risk assessment and reliability analysis of fault trees.

Fuzzy control theory based quantitative evaluation of dust protection facilities in coal mine

WEI Yong

2017, 27(5): 134-139. doi:10.16265/j.cnki.issn1003-3033.2017.05.024

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In order to improve the evaluation of the dust removal effect of coal mine dust protection facilities, a quantitative evaluation method with fuzzy control theory was developed. Firstly, a multi-level assessment index system was established for the dust protection facilities, and membership functions of the evaluation factors were constructed with Logistic equation as the main body. Secondly, based on the fuzzy control theory, a fuzzifier and a defuzzifier of evaluation universe were studied and established, and the weights of the evaluation factors were determined by using AHP. A mathematical model of FCQE was built. Finally, a quantitative evaluation was carried out at a certain mine heading face. The results show that the FCQE method improves the way to obtain the evaluation universe in AHP, which means there is no longer the need to rely on the experts' judgment (the expert knowledge is integrated into the weight of the evaluation factors), so that the quantitative evaluation can be achieved quickly after collecting the data directly, and that the evaluation results conform to the actual situation.

Progress in research on test and evaluation of protective clothing performance in disaster environment

XU Chang, SHEN Shifei, FU Ming, WANG Daoliang, QIAN Yiwu

2017, 27(5): 140-145. doi:10.16265/j.cnki.issn1003-3033.2017.05.025

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To have a general overview of the progress in research on performance test and evaluation of protective clothing, fire, explosion,and leakage of dangerous chemicals were selected as typical disaster environmental conditions, a systematic and thorough literature investigation was carried out. From the two aspects of single and complex disaster environments, the status of research on protective clothing performance evaluation was analyzed, and the future trends were predicted. The research results show that for single disaster environments, the fabric performance test methods are currently widely used, while the research on clothing ensemble protective performance test is insufficient,that the protective clothing performance tests in complex disaster environment are carried out under multi independent disaster environmental conditions, while no method has been developed for testing the performance in multi-hazards coupling environments,and that the trends in the research are to optimize the ensemble and comprehensive protective performance test methods and evaluate the protective clothing's performance under complex disaster environment conditions.

Identification of critical safety risk factors in oil depot based on complex network theory

YUE Xijian, YUAN Yongbo, ZHANG Mingyuan, HE Xiang

2017, 27(5): 146-151. doi:10.16265/j.cnki.issn1003-3033.2017.05.026

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To improve the level of oil depot safety management, a method was proposed for identifying the most important set of risk factors based on complex network theory and the influence of the correlation between risk factors on their importance. Based on the identification of the safety risk factors, a weighted safety risk network model was built according to the relationship and influence intensity among them. Importance evaluation criteria of the risk factors were designed based on the risk level and their influence on local and global network. Importance sequencing of those factors was carried out by using the AHP-GRA-TOPSIS model, providing a basis for recognition of the critical factors. A certain oil depot project was taken as an example, the risk factors in which were identified by using the method. The results show that weakness in performance of personnel and that in safety management are the critical risk factors of the oil deport project.

SEM-based research on construction workers safety knowledge sharing mechanism

ZHANG Shilian, LIU Man, CHEN Xianglei

2017, 27(5): 152-157. doi:10.16265/j.cnki.issn1003-3033.2017.05.027

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In order to analyze the relationships between the factors influencing the construction enterprise workers safety knowledge sharing,literature review and expert consultations were carried out to identify 6 indicators including 34 factors, and to build a conceptual assumption model for factors influencing building enterprise workers'safety knowledge sharing behavior.A questionnaire survey was conducted to quantify the factors. A verification analysis of factors was made by using AMOS and SPSS for the model. The results show that the organization atmosphere, interest stimulation, safety training and project discussion have a great influence on workers safety knowledge sharing, and the first one has the greatest influence, and that for the sake of preventing the construction safety accidents, the construction enterprises should pay full attention to improving the atmosphere of the enterprise, strengthening the internal management, improving the communication between the employees and communication, and inereasing the frequency of the workers'safety knowledge sharing behavior.

Analysis of black spot for freeway based on both statistics and hypothesis testing

MENG Xianghai, QIN Wei

2017, 27(5): 158-163. doi:10.16265/j.cnki.issn1003-3033.2017.05.028

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In order to identify the black spots of freeway's basic segment and recognize the crash contributing factors, statistical distribution fitting and hypothesis testing were used to analyze the statistical distribution of crashes. Methods of critical crashes number determination and segment division were provided. Similarities and differences between the sliding window method and the equal-length division method were analyzed, and then probability formulas and an identification method of crash contributing factors which based on binomial test methods were given. The results showed that the crashes on freeway basic segments fit the negative binomial distribution, that the segment division method which based on negative binomial distribution is reliable, and taht although the sliding window method has a tendency to exaggerate the number of black spots, it does reflect the intensity of crashes. Case study also showed that crash contributing factors of black spots can be identified by the binomial test method.

Safety assessment of bridge based on RBF neural network and adaptive fuzzy inference

WANG Bin, XU Xiuli, LI Xuehong, LI Zhijun, ZHANG Jiandong

2017, 27(5): 164-168. doi:10.16265/j.cnki.issn1003-3033.2017.05.029

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In order to accurately evaluate the safety performance of bridge, an evaluation index system was established for safety assessment of existing reinforced concrete bridges based on the structure properties. Rating standards were developed for the evaluation indexes. RBF neural network was used to replace the traditional BP neural network, improving the learning speed and scope of application. A safety evaluation system was established for existing bridges based on RBF neural network and adaptive fuzzy inference. The system was used to evaluate the safety of a certain steel concrete bridge. The results show that a large number of experts evaluation data can provide sufficient input data for the evaluation system, and that the system after studying can imitate the actual evaluation results of experts quickly and efficiently, and can accurately evaluate the actual safety condition of the bridge.

Homogeneous and heterogeneous building blocks in national emergency organizational collaboration networks

LIU Liang, WANG Jian, HAN Chuanfeng

2017, 27(5): 169-174. doi:10.16265/j.cnki.issn1003-3033.2017.05.030

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In order to comparatively analyze the basic building blocks of national emergency management systems across different countries,the NEOCN of China and of the U.S. (i.e., NEOCN-CHN and NEOCN-US) were constructed. The homogeneous and heterogeneous building blocks were comparatively investigated using the network motif method. Results show that the building blocks in the NEOCN of China and of the U.S. are characterized by homogeneous types of (anti-)motifs, as well as heterogeneous distribution of (anti-)motifs, and that the optimization of emergency organizational collaboration system needs to take into account both the identity in connotation between emergency network motifs and the difference in construction mechanism between emergency networks.

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