The main purpose of the model is to present how the Unified Modeling Language (UML) can be used for modeling digital video database system (VDBS). It demonstrates the modeling process that can be followed during the a...The main purpose of the model is to present how the Unified Modeling Language (UML) can be used for modeling digital video database system (VDBS). It demonstrates the modeling process that can be followed during the analysis phase of complex applications. In order to guarantee the continuity mapping of the models, the authors propose some suggestions to transform the use case diagrams into an object diagram, which is one of the main diagrams for the next development phases.展开更多
It has been found that unknown meteor showers could be efficiently discovered from the single station video meteor database of the International Meteor Organization(IMO)by assuming the geocentric velocity and adjustin...It has been found that unknown meteor showers could be efficiently discovered from the single station video meteor database of the International Meteor Organization(IMO)by assuming the geocentric velocity and adjusting it within the dynamically permitted range.The mean geocentric velocities of new meteor showers can be obtained,as well as the coordinates of the radiants.The activity period and maximum time can also be obtained if there are sufficient shower meteors.All single station video meteor observations between February 13 and 17(from 2000 to 2005)in IMO's database are processed with this method.As a result,two new meteor showers,one near RA=245.10°,Dec=41.82°in Hercules and the other near RA=233.03°,Dec=17.04°in Serpenids,are discovered.Some dynamical characteristics of the new meteor showers are also determined.Considering the random nature on the selection of period in this work,it is expected that there are some more potential new meteor showers in IMO's video database.展开更多
基金Supported by the Scientific Item of National Power Company(SPKJ0 16 -0 71)
文摘The main purpose of the model is to present how the Unified Modeling Language (UML) can be used for modeling digital video database system (VDBS). It demonstrates the modeling process that can be followed during the analysis phase of complex applications. In order to guarantee the continuity mapping of the models, the authors propose some suggestions to transform the use case diagrams into an object diagram, which is one of the main diagrams for the next development phases.
基金the National Natural Science Foundation of China(Grant No.10373004)
文摘It has been found that unknown meteor showers could be efficiently discovered from the single station video meteor database of the International Meteor Organization(IMO)by assuming the geocentric velocity and adjusting it within the dynamically permitted range.The mean geocentric velocities of new meteor showers can be obtained,as well as the coordinates of the radiants.The activity period and maximum time can also be obtained if there are sufficient shower meteors.All single station video meteor observations between February 13 and 17(from 2000 to 2005)in IMO's database are processed with this method.As a result,two new meteor showers,one near RA=245.10°,Dec=41.82°in Hercules and the other near RA=233.03°,Dec=17.04°in Serpenids,are discovered.Some dynamical characteristics of the new meteor showers are also determined.Considering the random nature on the selection of period in this work,it is expected that there are some more potential new meteor showers in IMO's video database.
