20世纪90年代后期,美军在指挥、控制、通信、计算机和情报(C^4l)领域的一个重大举措是决定建立全球信息栅格网(Global Information Grid,GIG)。建立这样一种系统的目的就是——“把恰当的信息,在恰当的时间,以恰当的方式,送交给恰当的...20世纪90年代后期,美军在指挥、控制、通信、计算机和情报(C^4l)领域的一个重大举措是决定建立全球信息栅格网(Global Information Grid,GIG)。建立这样一种系统的目的就是——“把恰当的信息,在恰当的时间,以恰当的方式,送交给恰当的指战员”展开更多
An effective assemble-oriented framework for grid Web service based on open grid service architecture was proposed,in which Web service semantics network constructed by software reuse was designed to enhance the locat...An effective assemble-oriented framework for grid Web service based on open grid service architecture was proposed,in which Web service semantics network constructed by software reuse was designed to enhance the locating of assemble-oriented service resources.The successful Web services assembled structure was exploited to design semantics network,the logical and the physical structure of the resource was separated in Web service,and the logical resource derived from type ID of Web service was combined with semantic structure.The organizing protocol,data structures and the mechanism of implementation in the model were presented.Experiment results show that the success ratio of Web service request comes to 100% while providing completely assembly semantics set.This model provides guarantee of the reliability of assemble Web service and establishes the foundation of Web service automatic interaction,customizing application service and dynamic service configuration.展开更多
This dissertation aims at providing steady sensing for the shape detection of colonoscopes. The research especially deals with the key techniques of fiber bragg grating (FBG) large curvature sensor and sensor net, int...This dissertation aims at providing steady sensing for the shape detection of colonoscopes. The research especially deals with the key techniques of fiber bragg grating (FBG) large curvature sensor and sensor net, integrates the techniques of mechatronics and computer graphics, and develops real time FBG shape sensing system and incremental shape sensing system for colonoscopies.展开更多
High-precision fiber Bragg grating se nsor demodulation instrument with wide-range dynamic scanning can effectivel y improve the measuring range of the optical fiber grating sensor.Ethernet com munication module is an...High-precision fiber Bragg grating se nsor demodulation instrument with wide-range dynamic scanning can effectivel y improve the measuring range of the optical fiber grating sensor.Ethernet com munication module is an extremely important part of the high-precision grating sensor demodulation device.Network interface based on Ethernet control chip D M9000A is used to send and receive the Bragg grating sensing pulse.The network transformer YL18-2050S is used to convert and filter the pulse from network.The transmitting and receiving program of grating demodulation,hardware circuit of Ethernet transmission interface are designed.The experimental results show that the network interface can achieve accurate and real-time transmissi on of the grating sensing information at high speed.展开更多
The improvement of the signal to noise ratio （SNR） has significant meaning to the fiber Bragg grating （FBG） sensing system. The source of the noise as well as the signal attenuation of the FBG sensing system is an...The improvement of the signal to noise ratio （SNR） has significant meaning to the fiber Bragg grating （FBG） sensing system. The source of the noise as well as the signal attenuation of the FBG sensing system is analyzed. It is found that optical noise caused by the optical return loss （ORL） is the main source of noises in the system, and the coupler is the main source of attenuation of the signal. The cause of the ORL in fiber-optic elements （such as jumper cables connector and fiber end） is presented. In addition, suggestions to optimize the fiber optical sensing network in order to improve the SNR are presented. Methods to suppress noises caused by the fiber end interfaces of FBGs, including using index-matching fluid, bending fiber p!gtails in the way mentioned in this paper and cleaving the slant angle of the fiber interfaces to be 8, all contribute to the optimized SNR. Besides, the thermo-weld method is suggested to be used for both parallel and serial FBG setups to provide a low insertion loss. The results would be a useful engineering tool to design the high SNR optical sensing system.展开更多
基金Project (60573127) supported by the National Natural Science Foundation of ChinaProject (06023960) supported by the Natural Science Foundation of Guangdong Province, ChinaProject (06JJ30032) supported by the Natural Science Foundation of Hunan Province, China
文摘An effective assemble-oriented framework for grid Web service based on open grid service architecture was proposed,in which Web service semantics network constructed by software reuse was designed to enhance the locating of assemble-oriented service resources.The successful Web services assembled structure was exploited to design semantics network,the logical and the physical structure of the resource was separated in Web service,and the logical resource derived from type ID of Web service was combined with semantic structure.The organizing protocol,data structures and the mechanism of implementation in the model were presented.Experiment results show that the success ratio of Web service request comes to 100% while providing completely assembly semantics set.This model provides guarantee of the reliability of assemble Web service and establishes the foundation of Web service automatic interaction,customizing application service and dynamic service configuration.
文摘This dissertation aims at providing steady sensing for the shape detection of colonoscopes. The research especially deals with the key techniques of fiber bragg grating (FBG) large curvature sensor and sensor net, integrates the techniques of mechatronics and computer graphics, and develops real time FBG shape sensing system and incremental shape sensing system for colonoscopies.
文摘High-precision fiber Bragg grating se nsor demodulation instrument with wide-range dynamic scanning can effectivel y improve the measuring range of the optical fiber grating sensor.Ethernet com munication module is an extremely important part of the high-precision grating sensor demodulation device.Network interface based on Ethernet control chip D M9000A is used to send and receive the Bragg grating sensing pulse.The network transformer YL18-2050S is used to convert and filter the pulse from network.The transmitting and receiving program of grating demodulation,hardware circuit of Ethernet transmission interface are designed.The experimental results show that the network interface can achieve accurate and real-time transmissi on of the grating sensing information at high speed.
文摘The improvement of the signal to noise ratio （SNR） has significant meaning to the fiber Bragg grating （FBG） sensing system. The source of the noise as well as the signal attenuation of the FBG sensing system is analyzed. It is found that optical noise caused by the optical return loss （ORL） is the main source of noises in the system, and the coupler is the main source of attenuation of the signal. The cause of the ORL in fiber-optic elements （such as jumper cables connector and fiber end） is presented. In addition, suggestions to optimize the fiber optical sensing network in order to improve the SNR are presented. Methods to suppress noises caused by the fiber end interfaces of FBGs, including using index-matching fluid, bending fiber p!gtails in the way mentioned in this paper and cleaving the slant angle of the fiber interfaces to be 8, all contribute to the optimized SNR. Besides, the thermo-weld method is suggested to be used for both parallel and serial FBG setups to provide a low insertion loss. The results would be a useful engineering tool to design the high SNR optical sensing system.
