Lianming Xu

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An integrated location algorithm using satellite location and wireless sensor networks (WSN) is put forward to solve the issues of seamless location both indoors and outdoors in a pervasive computing environment in this paper. Pseudorange observation data of global positioning system (GPS) and distance observation data of WSN are utilized to carry out(More)
For the goal of seamless indoor and outdoor location based services(LBS), a integrated navigation algorithm with both satellite location and WSN is put forward in this paper. This paper also design semi- physical simulation platform based on software receiver structure, which integrate GPS receiver and WSN nodes. Pseudorange observation data of global(More)
ˉThe stress filed and deformation of the slope could be calculated by FEM method, but the coefficient of safety could not be obtained from the results. It is relatively straightforward to get the coefficient of safety when the critical slip surface (CSS) is clear based on stress filed, while it is complex when the CSS is unknown. However, there are several(More)
Traditional global positioning system (GPS) is not suitable for indoor location environments. A wireless sensor network (WSN)-aided GPS location algorithm is put forward in this paper in order to realize seamless connection between indoor and outdoor locations and shorten search and acquisition time of GPS signal. The algorithm utilizes auxiliary location(More)
Queuing is common in urban public places. Automatically monitoring and predicting queuing time can not only help individuals to reduce their wait time and alleviate anxiety but also help managers to allocate resources more efficiently and enhance their ability to address emergencies. This paper proposes a novel method to estimate and predict queuing time in(More)
—An improved Kalman filter algorithm is proposed by two kinds of anti-perturbation method which is derived according to the perturbation theorem of inverse matrix. Furthermore, direction-correcting has been merged into the algorithm by using multiple hypothesis testing theory which can detect the current direction of a target. Finally, Both quantitative and(More)
üThe accurate determination of initial geo-stress field is the important premise of numerical simulation to the excavation of underground powerhouse. It is usually measured to get the value of initial geo-stress field. But it can not meet the demand of construction by this way. So it is very important to seek the methods that simulates initial geo-stress(More)
This paper proposed the concept of LAGMS (Large-scale Architectural Grid Management and Service) using the basic idea of SIMG (Spatial Information Multi-grid), as well as the framework and construction of LAGMS system. Utilizing Internet, wireless communications technology comprehensively the system arranged the management processes, optimized the(More)