Results 51 to 60 of about 478,149 (274)
Packet Relaying Control in Sensing-based Spectrum Sharing Systems
, 2013 Cognitive relaying has been introduced for opportunistic spectrum access systems by which a secondary node forwards primary packets whenever the primary link faces an outage condition.
Foukalas, F., Khattab, T., Poor, H. V.
core +1 more source
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source
Spectrum Hole Geolocation for Database-Driven IoT-Enabled Dynamic Spectrum Access
IEEE AccessThe effective realization of dynamic spectrum access (DSA) subsumes that, when a secondary terminal seeks a vacant band, the geolocation of the candidate spectrum hole coincides with the position of the terminal.
Dayan Adionel Guimaraes
doaj +1 more source
Spectrum sharing through distributed coordination in dynamic spectrum access networks [PDF]
Wireless Communications and Mobile Computing, 2007 AbstractSpectrum sharing in Open Spectrum systems is a challenging problem, particularly since users experience dynamic spectrum availabilities that vary over time and location. In the absence of any centralized infrastructure, users coordinate their spectrum usage to support fair access of spectrum and avoid interference.
Zhao, J, Zheng, H, Yang, GH
openaire +3 more sources
Organoids in pediatric cancer research
FEBS Letters, EarlyView.Organoid technology has revolutionized cancer research, yet its application in pediatric oncology remains limited. Recent advances have enabled the development of pediatric tumor organoids, offering new insights into disease biology, treatment response, and interactions with the tumor microenvironment.
Carla Ríos Arceo, Jarno Drost
wiley +1 more source
IEEE Access, 2020 With the envisioned massive connectivity era, one of the challenges for 5G/Beyond 5G (B5G) wireless systems will be handling the unprecedented spectrum crunch.
Soo-Min Kim +7 more
doaj +1 more source
Decentralized Dynamic Hop Selection and Power Control in Cognitive Multi-hop Relay Systems [PDF]
, 2010 In this paper, we consider a cognitive multi-hop relay secondary user (SU) system sharing the spectrum with some primary users (PU). The transmit power as well as the hop selection of the cognitive relays can be dynamically adapted according to the local
Lau, Vincent K. N., Ruan, Liangzhong
core +1 more source
Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?
FEBS Letters, EarlyView.This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes +3 more
wiley +1 more source
5G Technology: Towards Dynamic Spectrum Sharing Using Cognitive Radio Networks
IEEE Access, 2020 The explosive popularity of small-cell and Internet of Everything devices has tremendously increased traffic loads. This increase has revolutionised the current network into 5G technology, which demands increased capacity, high data rate and ultra-low ...
W. S. H. M. W. Ahmad +6 more
doaj +1 more source
Dynamic spectrum sharing game by lease
, 2008 We propose and analyze a dynamic implementation of the property-rights model of cognitive radio. A primary link has the possibility to lease the owned spectrum to a MAC network of secondary nodes, in exchange for cooperation in the form of distributed space-time coding (DSTC).
Li, Cuilian +3 more
openaire +2 more sources