In order to design a more efficient and more convenient temperature acquisition system, an approach combining USB data acquisition card with K type thermocouple temperature sensor is proposed under the circumstance of...In order to design a more efficient and more convenient temperature acquisition system, an approach combining USB data acquisition card with K type thermocouple temperature sensor is proposed under the circumstance of LabVIEW 2012 programming software. Firstly, the LabVIEW 2012 programming software is used to complete a temperature acquisition control program. Secondly, K type thermocouple temperature sensor is employed to transfer the temperature information. Thirdly, Then the USB data acquisition card can collect the voltage of K type thermocouple temperature sensor and convert it to a temperature scale. And, the simplification of experimental procedure can reduce the cost of development greatly. Finally, the experimental results illustrate that the range of measurement temperature is more wide and the temperature scale is more accurate.展开更多
In this paper,we report the electronics of a timing measurement system of PTB(portable TDC board), which is a handy tool based on USB interface,customized for high precision time measurements without any crates. The t...In this paper,we report the electronics of a timing measurement system of PTB(portable TDC board), which is a handy tool based on USB interface,customized for high precision time measurements without any crates. The time digitization is based on the High Performance TDC Chip(HPTDC).The real-time compensation for HPTDC outputs and the USB master logic are implemented in an ALTERA's Cyclone FPGA.The architecture design and logic design are described in detail.Test of the system showed a time resolution of 13.3 ps.展开更多
With the increasing demand for information security,traditional single-factor authentication technology can no longer meet security requirements.To this end,this paper proposes a Universal Serial Bus(USB)Key hardware ...With the increasing demand for information security,traditional single-factor authentication technology can no longer meet security requirements.To this end,this paper proposes a Universal Serial Bus(USB)Key hardware and software system based on a two-factor authentication protocol,aiming to improve the security and reliability of authentication.This paper first analyzes the current status and technical principles of USB Key-related research domestically and internationally and designs a two-factor authentication protocol that combines impact/response authentication and static password authentication.The system consists of a host computer and a USB Key device.The host computer interacts with the USB Key through a graphical user interface.The Secure Hash Algorithm 1(SHA-1)and MySQL database are used to implement the authentication function.Experimental results show that the designed two-factor authentication protocol can effectively prevent replay attacks and information tampering,and improve the security of authentication.If the corresponding USB Key is not inserted,the system will prompt that the device is not found.Once the USB Key is inserted,user identity is confirmed through two-factor verification,which includes impact/response authentication and static password authentication.展开更多
针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了US...针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了USB设备访问控制系统.实验验证了该模型及其访问控制系统的可行性,表明该系统可解决传统USB设备访问控制存在的粗粒度、静态分配等问题.展开更多
文摘In order to design a more efficient and more convenient temperature acquisition system, an approach combining USB data acquisition card with K type thermocouple temperature sensor is proposed under the circumstance of LabVIEW 2012 programming software. Firstly, the LabVIEW 2012 programming software is used to complete a temperature acquisition control program. Secondly, K type thermocouple temperature sensor is employed to transfer the temperature information. Thirdly, Then the USB data acquisition card can collect the voltage of K type thermocouple temperature sensor and convert it to a temperature scale. And, the simplification of experimental procedure can reduce the cost of development greatly. Finally, the experimental results illustrate that the range of measurement temperature is more wide and the temperature scale is more accurate.
基金Supported by the National Natural Science Foundation of China(Grant No.10775133)
文摘In this paper,we report the electronics of a timing measurement system of PTB(portable TDC board), which is a handy tool based on USB interface,customized for high precision time measurements without any crates. The time digitization is based on the High Performance TDC Chip(HPTDC).The real-time compensation for HPTDC outputs and the USB master logic are implemented in an ALTERA's Cyclone FPGA.The architecture design and logic design are described in detail.Test of the system showed a time resolution of 13.3 ps.
基金funded by the College-level Characteristic Teaching Material Project(Project No.20220119Z0221)The College Teaching Incubation Project(Project No.20220120Z0220)+3 种基金The Ministry of Education Industry-University Cooperation Collaborative Education Project(Project No.20220163H0211)The Central Universities Basic Scientific Research Fund(Project No.3282024009,20230051Z0114,and 20230050Z0114)The Beijing Higher Education“Undergraduate Teaching Reform and Innovation Project”(Project No.20220121Z0208 and 202110018002)The College Discipline Construction Project(Project No.20230007Z0452 and 20230010Z0452)。
文摘With the increasing demand for information security,traditional single-factor authentication technology can no longer meet security requirements.To this end,this paper proposes a Universal Serial Bus(USB)Key hardware and software system based on a two-factor authentication protocol,aiming to improve the security and reliability of authentication.This paper first analyzes the current status and technical principles of USB Key-related research domestically and internationally and designs a two-factor authentication protocol that combines impact/response authentication and static password authentication.The system consists of a host computer and a USB Key device.The host computer interacts with the USB Key through a graphical user interface.The Secure Hash Algorithm 1(SHA-1)and MySQL database are used to implement the authentication function.Experimental results show that the designed two-factor authentication protocol can effectively prevent replay attacks and information tampering,and improve the security of authentication.If the corresponding USB Key is not inserted,the system will prompt that the device is not found.Once the USB Key is inserted,user identity is confirmed through two-factor verification,which includes impact/response authentication and static password authentication.
文摘针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了USB设备访问控制系统.实验验证了该模型及其访问控制系统的可行性,表明该系统可解决传统USB设备访问控制存在的粗粒度、静态分配等问题.
