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Homotopic routing asks for a path going around holes according to a given “threading”. Paths of different homo-topy types can be used to improve load balancing and routing resilience. We propose the first lightweight homotopic routing scheme that generates constant bounded stretch compared to the shortest path of the same homotopy type. Our main insight is that in a sequence of triangles to traverse,...
We consider the problem of deployment of cameras inside a complex indoor setting for surveillance applications. We formulate the problem of the minimum guarding network that places a minimum number of cameras satisfying both visual coverage of the domain and wireless network connectivity. We prove that finding the minimum guarding network in both the geometric setting and discrete setting is NP-hard...
E-government is the application of computer and network technology to integrate the government's management and services on the Internet to achieve national administrative organization structure and work flow optimization, reorganization, beyond time, space and departmental restrictions on physical separation, to provide efficient and comprehensive, transparent and standardized, convenient and consistent...
The tidal-flow constructed wetland is a new type of constructed wetland proposed by the University of Birmingham, U.K. The principal of the wetland takes advantage of the rhythmical movement of wastewater and air which accelerates the alternation of aerobic and anaerobic to realize and enhance pollutant removal. This study focused on two aspects, the different operation performances for treating pollutants...
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