By comparing the difference between the security aspects of 2G and 3G system, user′s secure access in the 2G & 3G network is investigated, and the authentication mechanism of the 2G and 3G roaming users′ access to the 2G & 3G network is analyzed.
This paper studies the realization scheme of the virtual Navigation System based on VRML virtual reality and Java technology with the research in depth in the usage of the technology of Java realizing interactivity in virtual environment based on VRML and fashion that realizing interactivity of virtual object and user.
(3) Using embedded Visual C++ and MapX / MapX Mobile of MapInfoCompany software tools, PDA navigation software are developed, the function ofsoftware include loading, zoom in, zoom out, choice, roving electronic map, GPSnavigation state map and airscape, GPS navigation module and so on.
In our scheme, an algorithm is developed for an HLR to identify such VLRs that there are new MSs roaming into them since the latest HLR database backing up.
The system has been used in behavior experiments for monitoring and recording bar-pressing in the operant chamber, contriolling rat roaming in the eight-arm maze, as well as navigating rats through a 3D obstacle route.
The map texture technology, LOD algorithm and dynamic multi-differentiating texture technology are of benefit to the construction of 3D road GIS, and improve the speed of roaming and effective visualization.
The frequencies of specific types of deformities in newly metamorphosed organisms from the microcosm studies and in free-roaming field-collected specimens were also similar.
Elevated whole body petroleum hydrocarbons and metals tissue residues were detected in organisms from the laboratory microcosms, as well as in the free-roaming specimens collected.
The simulation results showed that DTV positioning technology could remarkably improve the precision of system state estimates using smoothing methods for positioning systems or integrated navigation systems.
A Charge Coupled Device (CCD) camera is used for measuring and for visual navigation.
The visual navigation and control system allow the robot to navigate and track the target and to accomplish autonomous locomotion.
Finally, the algorithm of movement navigation based on the generalized coordinate system is put forward, and the part movement is guided.
Such photonic structures have attracted great interest due to their novel physics, link to photonic crystals, as well as potential applications in optical switching and navigation.