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QoS is a key factor to the utility of Wireless Sensor Network (WSN) especially in the case of multiple sources data detecting with different time property. For environment detecting, there are not only same sensors just for one element but also heterogeneous sensors for multiple elements. Sometimes a single sensor has multiple functions to get several(More)
Rays in city canyon is the most common mode of radio propagation. Our research is also based on this kind of urban assumption. This paper studies the impact of spatial building distribution on the path-loss exponent. The results are obtained by simulation. The simulation is based on a 3D ray tracing algorithm for the computation of the received power and on(More)
This paper discusses collaborative MIMO techniques among nearby base stations, relay stations and user equipments. It is vital to optimize performance and choose collaborative nodes due to unnecessary collision and cost while unlimited abusing of neighbors. After proving the usage possibility of helping node under certain situation, a node choosing protocol(More)
In this paper, we propose a novel hybrid method for the segmentation and automatic counting of biological cell image. The method is based on techniques of morphology, thresholding and watershed. It performs well in low contrast image where gradient-based method may fail. Experimental results on practical cell images are shown in the paper with the emphasis(More)
This work proposes to model city maps with a particular family of random tessellations: Crack STIT tessellations. This family of tessellations allow the generation of realistic city maps with a reduced number of parameters: the Anisotropy Ratio (ξ) and the Mean Building Block Area (MBBA). These city models are then used as input to a 3D ray tracing(More)
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