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Kwang‐Cheng Chen Bilge Kartal Cetin Yu‐Cheng Peng Neeli Prasad Jin Wang Songyoung Lee 《Wireless Communications and Mobile Computing》2010,10(4):451-466
Cognitive radio (CR) has been considered a key technology to enhance overall spectrum utilization by opportunistic transmissions in CR transmitter–receiver link(s). However, CRs must form a cognitive radio network (CRN) so that the messages can be forwarded from source to destination, on top of a number of opportunistic links from co‐existing multi‐radio systems. Unfortunately, appropriate routing in CRN of coexisting multi‐radio systems remains an open problem. We explore the fundamental behaviors of CR links to conclude three major challenges, and thus decompose general CRN into cognitive radio relay network (CRRN), CR uplink relay network, CR downlink relay network, and tunneling (or core) network. Due to extremely dynamic nature of CR links, traditional routing to maintain end‐to‐end routing table for ad hoc networks is not feasible. We locally build up one‐step forward table at each CR to proceed based on spectrum sensing to determine trend of paths from source to destination, while primary systems (PSs) follow original ways to forward packets like tunneling. From simulations over ad hoc with infrastructure network topology and random network topology, we demonstrate such simple routing concept known as CRN local on‐demand (CLOD) routing to be realistic at reasonable routing delay to route packets through. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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The amylases produced by a Bacillus subtilis were purified from three different media which occurred nonstarch, starched and after eight hours shocked by starch media. Purified enzymes were compared each other Km, purification steps, thermal stability, pH and bacterial growth. In shocked medium, bacterial growth and amylase production are much more than in starched medium. The enzyme was stable at 65°C in three media. Km values were found different in three media where maltose inhibited the amylase activity. This inhibition is a competitive inhibition. 相似文献
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Microsystem Technologies - MEMS (micro-electromechanical system) vibratory gyroscopes have attracted a lot of interest recently and these gyroscopes made their way through portable devices and... 相似文献
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Aksoy Talha Cetin Mehmet Cabuk Saye Nihan Senyel Kurkcuoglu Muzeyyen Anil Bilge Ozturk Gulsah Cabuk Alper 《Clean Technologies and Environmental Policy》2023,25(1):51-68
Clean Technologies and Environmental Policy - The study presents a GIS- and RS-based diagnostic model to determine the changes in the existing vegetation in the Urla, Çeşme, and Karaburun... 相似文献