دانلود مقاله A comparative study of packet combining based error recovery schemes for wireless networks انتشار 2014

Int. J. Ad Hoc and Ubiquitous Computing, Vol. 16, No. 3, 2014 Sheng-Shih Wang*, Pei-Chun Lee, Kan-Yen Linand Tzu-Chang Yeh Abstract: To provide reliable communications in wireless environments, two fundamental errorcontrol mechanisms, automatic repeat request (ARQ) and forward error correction (FEC) areproposed. However, the ARQ mechanism may suffer frequent retransmissions and the FECmechanism incurs bandwidth overhead. To reduce the number of retransmissions and supportefficient correction, pr ...

Ecology of Cities and Towns, A Comparative Approach

760 صفحه پی دی اف ContentsList of contributors xiiPreface xix1 Introduction: Scope of the book and need for developinga comparative approach to the ecological study of citiesand towns 1Mark J. McDonnell, Ju¨rgen H. Breuste and Amy K. HahsPart I Opportunities and challenges of conductingcomparative studies 72 Comparative urban ecology: challenges and possibilities 9Jari Niemela¨, D. Johan Kotze and Vesa Yli-Pelkonen3 Frameworks for urban ecosystem studies: gradients, patch dynamicsand the ...