This paper presents a passive monitoring mechanism, loss）, nodes inference （LoNI）, to identify loss）, nodes in wireless sensor network using end-to-end application traffic. Given topology dynamics and bandwidth co...This paper presents a passive monitoring mechanism, loss）, nodes inference （LoNI）, to identify loss）, nodes in wireless sensor network using end-to-end application traffic. Given topology dynamics and bandwidth constraints, a space-efficient packet marking scheme is first introduced. The scheme uses a Bloom filter as a compression tool so that path information can bc piggybacked by data packets. Based on the path information, LoNI then adopts a fast algorithm to detect lossy nodes. The algorithm formulates the inference problem as a weighted set-cover problem and solves it using a greedy approach with low complexity. Simulations show that LoNI can locate about 80% of lossy nodes when lossy nodes are rare in the network. Furthermore, LoNI performs better for the lossy nodes near the sink or with higher loss rates.展开更多
This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the com...This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the compression performance of RAC columns as well as the flexural performance of RAC slabs are overviewed and summarized.The seismic responses of beam-column joints,shear walls as well as frames made of RAC are also covered.The experimental observations indicate that the structural performance of RAC elements and structures is somewhat similar to that of natural aggregate concrete(NAC) members.A brief introduction to the application of RAC in sustainable buildings in China is also presented.展开更多
文摘This paper presents a passive monitoring mechanism, loss）, nodes inference （LoNI）, to identify loss）, nodes in wireless sensor network using end-to-end application traffic. Given topology dynamics and bandwidth constraints, a space-efficient packet marking scheme is first introduced. The scheme uses a Bloom filter as a compression tool so that path information can bc piggybacked by data packets. Based on the path information, LoNI then adopts a fast algorithm to detect lossy nodes. The algorithm formulates the inference problem as a weighted set-cover problem and solves it using a greedy approach with low complexity. Simulations show that LoNI can locate about 80% of lossy nodes when lossy nodes are rare in the network. Furthermore, LoNI performs better for the lossy nodes near the sink or with higher loss rates.
基金supported by the Natural National Science Foundation of China (Grant No. 51178340)the Shanghai Science and Technology Committee (Grant No. 10231202000)the New Century Excellent Talents in China Ministry of Education Project (Grant No. NCET-06-0383)
文摘This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the compression performance of RAC columns as well as the flexural performance of RAC slabs are overviewed and summarized.The seismic responses of beam-column joints,shear walls as well as frames made of RAC are also covered.The experimental observations indicate that the structural performance of RAC elements and structures is somewhat similar to that of natural aggregate concrete(NAC) members.A brief introduction to the application of RAC in sustainable buildings in China is also presented.
