Results 21 to 30 of about 575,267 (307)

Dynamic spectrum access and sharing through actor-critic deep reinforcement learning

open access: yesEURASIP Journal on Wireless Communications and Networking, 2022
When primary users of the spectrum use frequency channels intermittently, secondary users can selectively transmit without interfering with the primary users.
Liang Dong, Yuchen Qian, Yuan Xing
doaj   +1 more source

Systems for the management of respiratory disease in primary care - an international series: United Kingdom [PDF]

open access: yes, 2010
INTRODUCTION: The UK National Health Service (NHS) is essentially publicly funded through general taxation. Challenges facing the NHS include the rise in prevalence of long-term conditions and financial pressures.
Allison Worth   +14 more
core   +1 more source

Performance of Cognitive Stop-and-Wait Hybrid Automatic Repeat Request in the Face of Imperfect Sensing

open access: yesIEEE Access, 2016
The cognitive radio (CR) paradigm has the potential of improving the exploitation of the electromagnetic spectrum by detecting instantaneously unoccupied spectrum slots allocated to primary users (PUs).
Ateeq Ur Rehman   +3 more
doaj   +1 more source

Performance of Cognitive Selective-Repeat Hybrid Automatic Repeat Request

open access: yesIEEE Access, 2016
In this paper, a novel transmission protocol is proposed based on the classical selective-repeat hybrid automatic repeat to access a primary user (PU) channel, which is referred to as the CSR-HARQ.
Ateeq Ur Rehman   +3 more
doaj   +1 more source

Matrix support in the care network to people with needs by the use of alcohol and other drugs

open access: yesCadernos Brasileiros de Terapia Ocupacional, 2020
The study focuses on the relationship between the Centers for Psychosocial Care Alcohol and other drugs (CAPS AD) and Basic Care through the Matrix Support.
Paula de Fátima Oliveira Faria   +2 more
doaj   +1 more source

Bayesian compressive sensing for primary user detection

open access: yesIET Signal Processing, 2016
In compressive sensing (CS)‐based spectrum sensing literature, most studies consider accurate reconstruction of the primary user signal rather than detection of the signal. Furthermore, possible absence of the signal is not taken into account while evaluating the spectrum sensing performance.
Başaran, Mehmet   +3 more
openaire   +2 more sources

Comparing primary heroin and primary amphetamine users’ knowledge of withdrawal and treatment options in inner metropolitan Brisbane, Australia [PDF]

open access: yes, 2003
The present study compared knowledge of withdrawal and treatment services among 12 primary heroin injectors (PHIs) and 14 primary amphetamine injectors (PAIs). Assessment of knowledge about withdrawal and treatment was made using the Withdrawal Knowledge
Howick, Guy A., Sullivan, Karen A.
core   +1 more source

Primary User Localization and Its Error Analysis in 5G Cognitive Radio Networks

open access: yesSensors, 2019
It is crucial to estimate the location of primary users (PUs) for the development of cognitive radio networks (CRNs). Great efforts have been made in the past to develop localization algorithms with better accuracy but low computation.
Nasir Saeed   +3 more
doaj   +1 more source

Controlling Emissions To Atmosphere Through The Use Of A Dry-Sliding Secondary Containment Seal [PDF]

open access: yes, 1993
Lecturepg. 55Increasing concern over the emission of hazardous compounds to the atmosphere has led to stricter regulations regarding the acceptable amount of leakage from pumps.
Sandgren, Jan E.   +2 more
core   +1 more source

Maximizing Cognitive Radio Networks Throughput Using Limited Historical Behavior of Primary Users

open access: yesIEEE Access, 2018
Cognitive radios (CRs) mainly aim to reuse the spectrum holes in order to efficiently utilize the available scarce radio spectrum. However, current CRs techniques have a throughput limitation problem which ultimately limits telecommunication applications
Srinivasa Kiran Gottapu   +3 more
doaj   +1 more source

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