Learn More
While the current generation of peer-to-peer networks share predominantly static files, future peer-to-peer networks will support sharing of files that are modified frequently by their users. In this paper, we present techniques to maintain temporal consistency of replicated files in a peer-to-peer network. We consider the Gnutella P2P network and present(More)
BACKGROUND Obesity, physical inactivity, and reduced physical fitness contribute to the rising burden of chronic diseases in China. We investigated these factors in Chinese adults over a 14-year period (2000-14) using data from randomised national surveys. METHODS We did four national surveys in 2000, 2005, 2010, and 2014 among Chinese adults aged 20-59(More)
Traditionally, the most precise way to get the mutual inductance value is by a Campbell calculable mutual inductor. Here, an approach of measuring the mutual inductance at low frequency with compensation method is described. A multi-channel direct digital frequency synthesis source is developed to provide stable and precise phase. The mutual inductance is(More)
2-(4-Azidophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (14), 2-(4-azidophenyl)benzimidazole-1-oxide-3-oxyl (16), 2-(4-azidophenyl)-1,2,6-triphenylverdazyl (19), 2-(3-azidophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (21), and (3-azidophenyl)-N-tert-butyl-N-aminoxyl (25) were photolyzed in frozen solution to give(More)
Peer-to-peer (P2P) file sharing systems provide infrastructure for communities to share storage space (e.g., Napster, Gnutella [1], Kazza [2]). Unlike traditional distributed systems, P2P networks aim to aggregate large numbers of computers that join and leave the network frequently and might not have permanent network (IP) addresses. In a pure distributed(More)
To evaluate accurately the drilling status that affect safety of oil well drilling and reduce the occurrence rate of drilling accidents, this paper firstly analyzes the factors which affect the safety of drilling to determine the drilling safety evaluation indexes. Then it adopts analytic hierarchy process to construct a drilling safety evaluation model,(More)
Wireless body area network (WBAN) is a body-centric near field wireless communication network. It is a promising new technology for continuously telemedicine monitoring systems. Furthermore, ultra-wideband (UWB) is a promising air interface for near field communication matching the requirements of WBAN. Multipath effect caused by body scattering extremely(More)