As big data,Artificial Intelligence,and Vehicle-to-Everything(V2X)communication have advanced,Intelligent Transportation Systems(ITS)are being developed to enable efficient and safe transportation systems.Electronic T...As big data,Artificial Intelligence,and Vehicle-to-Everything(V2X)communication have advanced,Intelligent Transportation Systems(ITS)are being developed to enable efficient and safe transportation systems.Electronic Toll Collection(ETC),which is one of the services included in ITS systems,is an automated system that allows vehicles to pass through toll plazas without stopping for manual payment.The ETC system is widely deployed on highways due to its contribution to stabilizing the overall traffic system flow.To ensure secure and efficient toll payments,designing a distributed model for sharing toll payment information among untrusted toll service providers is necessary.However,the current ETC system operates under a centralized model.Additionally,both toll service providers and toll plazas know the toll usage history of vehicles.It raises concerns about revealing the entire driving routes and patterns of vehicles.To address these issues,blockchain technology,suitable for secure data management and data sharing in distributed systems,is being applied to the ETC system.Blockchain enables efficient and transparent management of ETC information.Nevertheless,the public nature of blockchain poses a challenge where users’usage records are exposed to all participants.To tackle this,we propose a blockchain-based toll ticket model named AnonymousTollPass that considers the privacy of vehicles.The proposed model utilizes traceable ring signatures to provide unlinkability between tickets used by a vehicle and prevent the identity of the vehicle using the ticket from being identified among the ring members for the ticket.Furthermore,malicious vehicles’identities can be traced when they attempt to reuse tickets.By conducting simulations,we show the effectiveness of the proposed model and demonstrate that gas fees required for executing the proposed smart contracts are only 10%(when the ring size is 50)of the fees required in previous studies.展开更多
In order to investigate the role of Toll-like receptor 4 （TLR4） in cerebrocardiac syndrome （CCS）, the partial cerebral ischemia/reperfusion （I/R） models in mice with different TLR4 genotypes were established in ...In order to investigate the role of Toll-like receptor 4 （TLR4） in cerebrocardiac syndrome （CCS）, the partial cerebral ischemia/reperfusion （I/R） models in mice with different TLR4 genotypes were established in the present study. TLR4 wild-type （C3H/HeN） and mutant （C3H/HeJ） mice of 6-8 weeks of age were divided into 4 groups at random： C3H/HeN sham group （n=10）, C3H/HeJ sham group （n=10）, C3H/HeN model group （n=10） and C3H/HeJ model group （n=10）. Partial cerebral I/R was caused by the middle cerebral artery occlusion （MCAO） to duplicate CCS models in mice. After the operation, the electrocardiogram （ECG）, the level of tumor necrosis factor-alpha （TNF-c0 in myocardial tissue and the cardiac pathological changes were observed in each group. It was shown that the brain infarct volume in C3H/HeN model group was larger than that in C3H/HeJ model group （P〈0.01）. The ST segment change and T wave inversion occurred frequently in model groups. Moreover, the TNF-ct level in C3H/HeN model group was higher than that in C3H/HeJ model group （P〈0.01）. The myocar- dial injury was aggravated in C3H/HeN group as compared with C3H/HeJ group. It was concluded that TLR4 was implicated in the development of CCS.展开更多
The backward secondary electron emission yields of MeV ions(H^(+),He^(+),He^(++),Cl,Si,and Cu)impinging on thick carbon and gold targets are studied.The measured results for H+(1MeV≤E≤5MeV)on carbon are proportional...The backward secondary electron emission yields of MeV ions(H^(+),He^(+),He^(++),Cl,Si,and Cu)impinging on thick carbon and gold targets are studied.The measured results for H+(1MeV≤E≤5MeV)on carbon are proportional to the electronic stopping power.Our experimental data and fitting formula of yields for H+(1 MeV≤E≤4.5MeV)impacting Au are compared with the theoretical expectation.The influence of the collective field and the charge state of ions on the secondary electron emission yield is discussed.展开更多
With the continuous progress ofscience and technology,the Internet has gradually entered every field of daily life.In addition to the information generated by the Internet in the form of digitization,it has become the...With the continuous progress ofscience and technology,the Internet has gradually entered every field of daily life.In addition to the information generated by the Internet in the form of digitization,it has become the main media for people to store information.In the field of criminal offenses,the network is likely to be used to perpetrate criminal schemes,implement crimes,or help hinder investigations afterward.These acts will leave an electronic data trail,such as WeChat information,emails,or blogs.After a crime occurs,an evidence investigator should accurately,timely,and comprehensively obtain all electronic data related to the case by collecting,extracting,and transferring this data according to the law,and examining the authenticity,legality,and relevance of the evidence.Through a comprehensive review,the investigator should clarify the relationship between the electronic data and the facts to be proved and make full use of the obtained electronic evidence in criminal proceedings.展开更多
In this paper,we theoretically investigate the existence and propagation of low amplitude nonlinear ion waves in a dense plasma under the influence of a strong magnetic field.The plasma consists of ultra-relativistic ...In this paper,we theoretically investigate the existence and propagation of low amplitude nonlinear ion waves in a dense plasma under the influence of a strong magnetic field.The plasma consists of ultra-relativistic and degenerate electrons and positrons and non-degenerate cold ions.Firstly,the appearance of two distinct linear modes and their evolution is studied by deriving a dispersion equation with the aid of Fourier analysis.Secondly,the dynamics of low amplitude ion solitary structures is investigated via a Korteweg-de Vries equation derived by employing a reductive perturbation method.The effects of various plasma parameters like positron concentration,strength of magnetic field,obliqueness of field,etc.,are discussed in detail.At the end,analytical results are supplemented through numerical analysis by using typical representative parameters consistent with degenerate and ultra-relativistic magnetoplasmas of astrophysical regimes.展开更多
介绍了一种电子雷管总线电流采集方法的专利技术,使用低成本的硬件方案,实现高精度、宽范围的电流采集。应用于电子雷管的工作电流、通讯电流、充电电流、雷管总线电流负载的采集,实现电子雷管的状态监测、数据通讯、总线保护等。重点...介绍了一种电子雷管总线电流采集方法的专利技术,使用低成本的硬件方案,实现高精度、宽范围的电流采集。应用于电子雷管的工作电流、通讯电流、充电电流、雷管总线电流负载的采集,实现电子雷管的状态监测、数据通讯、总线保护等。重点论述低成本电路设计思想,实现高精度、高分辨率、宽范围的电流采集方法。电子雷管控制模块的工作电流一般为10~30 uA,通过电流载波方式向起爆控制器发送数据,通讯电流一般为0.5~2 mA,并通过总线为发火储能电容充电,充电峰值电流1~2 mA。起爆控制器通过采集总线电流,判断电子控制模块的工作状态、采集通讯数据、充电情况等。电子雷管总线电流采集方法,使用低边电阻对电流采样,通过3路低成本的运算放大器代替差分比较器,使用MCU内部集成的12 bit AD转换器代替外部16 bit AD转换器,硬件成本降低80%以上。通过将电流分段采集,既满足了小电流采样精度,又扩展电流采样范围30倍,电流采样可覆盖总线额定电流。因无需外部AD转换模块,采样效率显著提高。展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2021R1A2C1095591).
文摘As big data,Artificial Intelligence,and Vehicle-to-Everything(V2X)communication have advanced,Intelligent Transportation Systems(ITS)are being developed to enable efficient and safe transportation systems.Electronic Toll Collection(ETC),which is one of the services included in ITS systems,is an automated system that allows vehicles to pass through toll plazas without stopping for manual payment.The ETC system is widely deployed on highways due to its contribution to stabilizing the overall traffic system flow.To ensure secure and efficient toll payments,designing a distributed model for sharing toll payment information among untrusted toll service providers is necessary.However,the current ETC system operates under a centralized model.Additionally,both toll service providers and toll plazas know the toll usage history of vehicles.It raises concerns about revealing the entire driving routes and patterns of vehicles.To address these issues,blockchain technology,suitable for secure data management and data sharing in distributed systems,is being applied to the ETC system.Blockchain enables efficient and transparent management of ETC information.Nevertheless,the public nature of blockchain poses a challenge where users’usage records are exposed to all participants.To tackle this,we propose a blockchain-based toll ticket model named AnonymousTollPass that considers the privacy of vehicles.The proposed model utilizes traceable ring signatures to provide unlinkability between tickets used by a vehicle and prevent the identity of the vehicle using the ticket from being identified among the ring members for the ticket.Furthermore,malicious vehicles’identities can be traced when they attempt to reuse tickets.By conducting simulations,we show the effectiveness of the proposed model and demonstrate that gas fees required for executing the proposed smart contracts are only 10%(when the ring size is 50)of the fees required in previous studies.
基金supported by the National Nature Science Foundation of China(No.81201444,No.81101401)
文摘In order to investigate the role of Toll-like receptor 4 （TLR4） in cerebrocardiac syndrome （CCS）, the partial cerebral ischemia/reperfusion （I/R） models in mice with different TLR4 genotypes were established in the present study. TLR4 wild-type （C3H/HeN） and mutant （C3H/HeJ） mice of 6-8 weeks of age were divided into 4 groups at random： C3H/HeN sham group （n=10）, C3H/HeJ sham group （n=10）, C3H/HeN model group （n=10） and C3H/HeJ model group （n=10）. Partial cerebral I/R was caused by the middle cerebral artery occlusion （MCAO） to duplicate CCS models in mice. After the operation, the electrocardiogram （ECG）, the level of tumor necrosis factor-alpha （TNF-c0 in myocardial tissue and the cardiac pathological changes were observed in each group. It was shown that the brain infarct volume in C3H/HeN model group was larger than that in C3H/HeJ model group （P〈0.01）. The ST segment change and T wave inversion occurred frequently in model groups. Moreover, the TNF-ct level in C3H/HeN model group was higher than that in C3H/HeJ model group （P〈0.01）. The myocar- dial injury was aggravated in C3H/HeN group as compared with C3H/HeJ group. It was concluded that TLR4 was implicated in the development of CCS.
文摘The backward secondary electron emission yields of MeV ions(H^(+),He^(+),He^(++),Cl,Si,and Cu)impinging on thick carbon and gold targets are studied.The measured results for H+(1MeV≤E≤5MeV)on carbon are proportional to the electronic stopping power.Our experimental data and fitting formula of yields for H+(1 MeV≤E≤4.5MeV)impacting Au are compared with the theoretical expectation.The influence of the collective field and the charge state of ions on the secondary electron emission yield is discussed.
文摘With the continuous progress ofscience and technology,the Internet has gradually entered every field of daily life.In addition to the information generated by the Internet in the form of digitization,it has become the main media for people to store information.In the field of criminal offenses,the network is likely to be used to perpetrate criminal schemes,implement crimes,or help hinder investigations afterward.These acts will leave an electronic data trail,such as WeChat information,emails,or blogs.After a crime occurs,an evidence investigator should accurately,timely,and comprehensively obtain all electronic data related to the case by collecting,extracting,and transferring this data according to the law,and examining the authenticity,legality,and relevance of the evidence.Through a comprehensive review,the investigator should clarify the relationship between the electronic data and the facts to be proved and make full use of the obtained electronic evidence in criminal proceedings.
文摘In this paper,we theoretically investigate the existence and propagation of low amplitude nonlinear ion waves in a dense plasma under the influence of a strong magnetic field.The plasma consists of ultra-relativistic and degenerate electrons and positrons and non-degenerate cold ions.Firstly,the appearance of two distinct linear modes and their evolution is studied by deriving a dispersion equation with the aid of Fourier analysis.Secondly,the dynamics of low amplitude ion solitary structures is investigated via a Korteweg-de Vries equation derived by employing a reductive perturbation method.The effects of various plasma parameters like positron concentration,strength of magnetic field,obliqueness of field,etc.,are discussed in detail.At the end,analytical results are supplemented through numerical analysis by using typical representative parameters consistent with degenerate and ultra-relativistic magnetoplasmas of astrophysical regimes.
文摘介绍了一种电子雷管总线电流采集方法的专利技术,使用低成本的硬件方案,实现高精度、宽范围的电流采集。应用于电子雷管的工作电流、通讯电流、充电电流、雷管总线电流负载的采集,实现电子雷管的状态监测、数据通讯、总线保护等。重点论述低成本电路设计思想,实现高精度、高分辨率、宽范围的电流采集方法。电子雷管控制模块的工作电流一般为10~30 uA,通过电流载波方式向起爆控制器发送数据,通讯电流一般为0.5~2 mA,并通过总线为发火储能电容充电,充电峰值电流1~2 mA。起爆控制器通过采集总线电流,判断电子控制模块的工作状态、采集通讯数据、充电情况等。电子雷管总线电流采集方法,使用低边电阻对电流采样,通过3路低成本的运算放大器代替差分比较器,使用MCU内部集成的12 bit AD转换器代替外部16 bit AD转换器,硬件成本降低80%以上。通过将电流分段采集,既满足了小电流采样精度,又扩展电流采样范围30倍,电流采样可覆盖总线额定电流。因无需外部AD转换模块,采样效率显著提高。
