Purpose–To systematically characterize and objectively evaluate basic railway safety management capability,creating a closed-loop management approach which allows continuous improvement and optimization.Design/method...Purpose–To systematically characterize and objectively evaluate basic railway safety management capability,creating a closed-loop management approach which allows continuous improvement and optimization.Design/methodology/approach–A basic railway safety management capability evaluation index system based on a comprehensive analysis of national safety management standards,railway safety rules and regulations and existing safety data from railway transport enterprises is presented.The system comprises a guideline layer including safety committee formation,work safety responsibility,safety management organization and safety rules and regulations as its components,along with an index layer consisting of 12 quantifiable indexes.Game theory combination weighting is utilized to integrate subjective and objective weight values derived using AHP and CRITIC methods and further combined using the TOPSIS method in order to construct a comprehensive basic railway safety management capability evaluation model.Findings–The case study presented demonstrates that this evaluation index system and comprehensive evaluation model are capable of effectively characterizing and evaluating basic railway safety management capability and providing directional guidance for its sustained improvement.Originality/value–Construction of an evaluation index system that is quantifiable,generalizable and accessible,accurately reflects the main aspects of railway transportation enterprises’basic safety management capability and provides interoperability across various railway transportation enterprises.The application of the game theoretic combination weighting method to derive composite weights which combine experts’subjective evaluations with the objectivity of data.展开更多
Purpose–Basic safety message(BSM)is a core subset of standard protocols for connected vehicle system to transmit related safety information via vehicle-to-vehicle(V2V)and vehicle-to-infrastructure(V2I).Although some ...Purpose–Basic safety message(BSM)is a core subset of standard protocols for connected vehicle system to transmit related safety information via vehicle-to-vehicle(V2V)and vehicle-to-infrastructure(V2I).Although some safety prototypes of connected vehicle have been proposed with effective strategies,few of them are fully evaluated in terms of the significance of BSM messages on performance of safety applications when in emergency.Design/methodology/approach–To address this problem,a data fusion method is proposed to capture the vehicle crash risk by extracting critical information from raw BSMs data,such as driver volition,vehicle speed,hard accelerations and braking.Thereafter,a classification model based on information-entropy and variable precision rough set(VPRS)is used for assessing the instantaneous driving safety by fusing the BSMs data fromfield test,and predicting the vehicle crash risk level with the driver emergency maneuvers in the next short term.Findings–Thefindings and implications are discussed for developing an improved warning and driving assistant system by using BSMs messages.Originality/value–Thefindings of this study are relevant to incorporation of alerts,warnings and control assists in V2V applications of connected vehicles.Such applications can help drivers identify situations where surrounding drivers are volatile,and they may avoid dangers by taking defensive actions.展开更多
October 14<sup>th</sup> will be an important day for all of our colleagues engaged in standardization.The theme of the 2008 World Standards Day is'Intelli-gent and sustainable buildings'.The requir...October 14<sup>th</sup> will be an important day for all of our colleagues engaged in standardization.The theme of the 2008 World Standards Day is'Intelli-gent and sustainable buildings'.The requirements for urban residential developments are rising daily,accompanied by increasing public awareness展开更多
In recent years, because of the supply-side structural reform in our country, the form of national coal has changed the previous development pattern and layout, and the coal price has generally rebounded, technical ma...In recent years, because of the supply-side structural reform in our country, the form of national coal has changed the previous development pattern and layout, and the coal price has generally rebounded, technical management, safety management, comprehensive quality of personnel, safety input, equipment management, system improvement, etc. At the same time, the state and industry to strengthen supervision, environmental and energy-saving situation is grim, resources and environmental constraints are more and more strong, coal mining and construction, mining conditions are more and more complex. With the depth of development and increase, gas, soil temperature, soil pressure, management, personnel and other issues intertwined bring many new problems. Therefore, the system safety engineering is particularly important in the basic construction of coal mine.展开更多
Recently,the importance of vehicle safety supporting system has been highlighted as autonomous driving and platooning has attracted the researchers.To ensure driving safety,each vehicle must broadcast a basic safety m...Recently,the importance of vehicle safety supporting system has been highlighted as autonomous driving and platooning has attracted the researchers.To ensure driving safety,each vehicle must broadcast a basic safety message(BSM)every 100 ms.However,stable BSM exchange is difficult because of the changing environment and limited bandwidth of vehicular wireless communication.The increasing number of vehicles on the road increases the competition to access wireless networks for BSM exchange;this increases the packet collision rate.An increased packet collision rate impairs the transmission and reception of BSM information,which can easily cause a traffic accident.We propose a solution,the vehicular safety support system(V3S),which exchanges BSMs reliably even when many vehicles are on the road.The V3S uses a clustering scheme to decrease network traffic by reducing the amount of data exchanged between a vehicle and the roadside unit(RSU).In addition,the V3S reduces the collision rate of wireless network packets by broadcasting the vehicle’s BSM in an allocated timeslot using the time division multiple access(TDMA)MAC protocol.The V3S also deals with insufficient bandwidth for dedicated short-range communications(DSRC)by changing DSRC channels according to traffic flow.In evaluating the packet error rate for stable BSM packet delivery,the V3S demonstrates an excellent packet error rate of less than 1%,compared to the 802.11p with its packet error rate of 82%.展开更多
A review was undertaken of the operation process and development of transcutaneous electrical acupoint stimulation(TEAS)and related devices for TEAS,with the aim to offer a reference for developing an international st...A review was undertaken of the operation process and development of transcutaneous electrical acupoint stimulation(TEAS)and related devices for TEAS,with the aim to offer a reference for developing an international standard for the basic safety and essential performance of the devices.The articles related to TEAS and instruction of devices for TEAS were searched using the EMBASE,MEDLINE,and Web of Science databases with the time period from inception to July 18,2023.In the absence of a parameter description of the stimulators,a multimeter was used to measure the output voltage,resistance,and current.Thirty-two related devices for TEAS were obtained.The safety parameters ofmost devices were neither clearly defined,nor standardized,and in some cases weremissing.There was a noticeable disparity in the upper safety limits of the output current among the devices.The sizes of the skin electrode pads as well as the lengths of the electrode connecting wires of most devices were not clearly indicated.Acupoints on different parts of the human body,including the upper limbs,head,auricle,chest,abdomen,trunk,and lower limbs,required different maximum tolerable current intensities and current densities.It is important to indicate comprehensive output/safety parameters and essential performance for devices for TEAS to meet the need of global distribution,achieve precise stimulation parameters at different acupoints across the human body,and allay any safety concern of national therapeutic device authorities,the regulators,manufacturers,and end users.展开更多
基金supported by the China National Railway Group Co.,Ltd.Research and Development Project(P2023T002).
文摘Purpose–To systematically characterize and objectively evaluate basic railway safety management capability,creating a closed-loop management approach which allows continuous improvement and optimization.Design/methodology/approach–A basic railway safety management capability evaluation index system based on a comprehensive analysis of national safety management standards,railway safety rules and regulations and existing safety data from railway transport enterprises is presented.The system comprises a guideline layer including safety committee formation,work safety responsibility,safety management organization and safety rules and regulations as its components,along with an index layer consisting of 12 quantifiable indexes.Game theory combination weighting is utilized to integrate subjective and objective weight values derived using AHP and CRITIC methods and further combined using the TOPSIS method in order to construct a comprehensive basic railway safety management capability evaluation model.Findings–The case study presented demonstrates that this evaluation index system and comprehensive evaluation model are capable of effectively characterizing and evaluating basic railway safety management capability and providing directional guidance for its sustained improvement.Originality/value–Construction of an evaluation index system that is quantifiable,generalizable and accessible,accurately reflects the main aspects of railway transportation enterprises’basic safety management capability and provides interoperability across various railway transportation enterprises.The application of the game theoretic combination weighting method to derive composite weights which combine experts’subjective evaluations with the objectivity of data.
基金supported by National Key R&D Program of China(Grant No.2017YFC0803900)National Nature Science Foundation of China(Grant No.61703160,No.51775396)+1 种基金Jiangxi Provincial Department of Education Science Research Fund Project(No.GJJ170420)Jiangxi Provincial Department of Transportation Science Research Fund Project(No.2018X0015).
文摘Purpose–Basic safety message(BSM)is a core subset of standard protocols for connected vehicle system to transmit related safety information via vehicle-to-vehicle(V2V)and vehicle-to-infrastructure(V2I).Although some safety prototypes of connected vehicle have been proposed with effective strategies,few of them are fully evaluated in terms of the significance of BSM messages on performance of safety applications when in emergency.Design/methodology/approach–To address this problem,a data fusion method is proposed to capture the vehicle crash risk by extracting critical information from raw BSMs data,such as driver volition,vehicle speed,hard accelerations and braking.Thereafter,a classification model based on information-entropy and variable precision rough set(VPRS)is used for assessing the instantaneous driving safety by fusing the BSMs data fromfield test,and predicting the vehicle crash risk level with the driver emergency maneuvers in the next short term.Findings–Thefindings and implications are discussed for developing an improved warning and driving assistant system by using BSMs messages.Originality/value–Thefindings of this study are relevant to incorporation of alerts,warnings and control assists in V2V applications of connected vehicles.Such applications can help drivers identify situations where surrounding drivers are volatile,and they may avoid dangers by taking defensive actions.
文摘October 14<sup>th</sup> will be an important day for all of our colleagues engaged in standardization.The theme of the 2008 World Standards Day is'Intelli-gent and sustainable buildings'.The requirements for urban residential developments are rising daily,accompanied by increasing public awareness
文摘In recent years, because of the supply-side structural reform in our country, the form of national coal has changed the previous development pattern and layout, and the coal price has generally rebounded, technical management, safety management, comprehensive quality of personnel, safety input, equipment management, system improvement, etc. At the same time, the state and industry to strengthen supervision, environmental and energy-saving situation is grim, resources and environmental constraints are more and more strong, coal mining and construction, mining conditions are more and more complex. With the depth of development and increase, gas, soil temperature, soil pressure, management, personnel and other issues intertwined bring many new problems. Therefore, the system safety engineering is particularly important in the basic construction of coal mine.
基金This work was supported in part by the Chung-Ang University Research Grants in 2019,and in part by R&D Program for Forest Science Technology(Project No.“2021338C10-2123-CD02)provided by Korea Forest Service(Korea Forestry Promotion Institute).
文摘Recently,the importance of vehicle safety supporting system has been highlighted as autonomous driving and platooning has attracted the researchers.To ensure driving safety,each vehicle must broadcast a basic safety message(BSM)every 100 ms.However,stable BSM exchange is difficult because of the changing environment and limited bandwidth of vehicular wireless communication.The increasing number of vehicles on the road increases the competition to access wireless networks for BSM exchange;this increases the packet collision rate.An increased packet collision rate impairs the transmission and reception of BSM information,which can easily cause a traffic accident.We propose a solution,the vehicular safety support system(V3S),which exchanges BSMs reliably even when many vehicles are on the road.The V3S uses a clustering scheme to decrease network traffic by reducing the amount of data exchanged between a vehicle and the roadside unit(RSU).In addition,the V3S reduces the collision rate of wireless network packets by broadcasting the vehicle’s BSM in an allocated timeslot using the time division multiple access(TDMA)MAC protocol.The V3S also deals with insufficient bandwidth for dedicated short-range communications(DSRC)by changing DSRC channels according to traffic flow.In evaluating the packet error rate for stable BSM packet delivery,the V3S demonstrates an excellent packet error rate of less than 1%,compared to the 802.11p with its packet error rate of 82%.
基金supported by the National Key R&D Program of China(2022YFC3500501)Science and Technology Innovation Project(CI2023C017YL)of China Academy of Chinese Medical Sciences2021 Qihuang Scholar Support Project(Peijing Rong).
文摘A review was undertaken of the operation process and development of transcutaneous electrical acupoint stimulation(TEAS)and related devices for TEAS,with the aim to offer a reference for developing an international standard for the basic safety and essential performance of the devices.The articles related to TEAS and instruction of devices for TEAS were searched using the EMBASE,MEDLINE,and Web of Science databases with the time period from inception to July 18,2023.In the absence of a parameter description of the stimulators,a multimeter was used to measure the output voltage,resistance,and current.Thirty-two related devices for TEAS were obtained.The safety parameters ofmost devices were neither clearly defined,nor standardized,and in some cases weremissing.There was a noticeable disparity in the upper safety limits of the output current among the devices.The sizes of the skin electrode pads as well as the lengths of the electrode connecting wires of most devices were not clearly indicated.Acupoints on different parts of the human body,including the upper limbs,head,auricle,chest,abdomen,trunk,and lower limbs,required different maximum tolerable current intensities and current densities.It is important to indicate comprehensive output/safety parameters and essential performance for devices for TEAS to meet the need of global distribution,achieve precise stimulation parameters at different acupoints across the human body,and allay any safety concern of national therapeutic device authorities,the regulators,manufacturers,and end users.
