Results 201 to 210 of about 262,424 (257)

Attitude and Environmental Factors Associated With Successful E-Cigarette Quitting Among Secondary School Students: A Cross-Sectional Observational Study. [PDF]

J Prim Care Community Health
Jiraporncharoen W, Buawangpong N, Singhasiri P, Oon-Arom A, Sirikul W, Choradon P, Yotruangsri T, Aramrattana A, Thaikla K, Tongton K, Champa A.   +10 more
europepmc   +1 more source

Association of long-term 5α-reductase inhibitor use with survival in men with renal cell carcinoma: a nationwide population-based cohort study. [PDF]

Front Pharmacol
Lee S, Lee J, Min K, Tae JH, Lee CU, Choi J, Kim JH, Lee YS, Nguyen TT, Choi SY.   +9 more
europepmc   +1 more source

Benzodiazepine or Z-hypnotic use during pregnancy and risk of psychiatric disorders in children: population based cohort study.

BMJ
Cho Y, Choi A, Woo J, Han JY, Kim JW, Shin JY.   +5 more
europepmc   +1 more source

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Percolation Degree of Secondary Users in Cognitive Networks

IEEE Journal on Selected Areas in Communications, 2012
A cognitive network refers to the one where two overlaid structures, called primary and secondary networks coexist. The primary network consists of primary nodes who are licensed spectrum users while the secondary network comprises unauthorized users that have to access the licensed spectrum opportunistically.
Luoyi Fu, Xinbing Wang, Xiaohua Tian
exaly   +2 more sources

DSCA: Dynamic Spectrum Co-Access Between the Primary Users and the Secondary Users

IEEE Transactions on Vehicular Technology, 2015
In the current architecture of dynamic spectrum access , secondary users (SUs) only opportunistically access the spectrum of primary users (PUs). The resurgence of PUs disrupts secondary communications, which can result in poor performance for SUs. In this paper, we propose a novel architecture for dynamic spectrum access, termed dynamic spectrum
Chunsheng Xin, Jonathan Backens, Changlong Chen   +2 more
exaly   +2 more sources

Serving Secondary Users:

College & Undergraduate Libraries, 1994
In the past, undergraduate libraries have tried to provide unlimited services to secondary users. Increased technological change, severe budget cuts, and lack of human resources are forcing libraries to examine their mission and audience and to determine what level of service they can offer unaffiliated users.
Mary Ellen Bobp, Debora Richey
openaire   +1 more source

Primary User Boundary Detection in Cognitive Radio Networks: Estimated Secondary User Locations and Impact of Malicious Secondary Users

IEEE Transactions on Vehicular Technology, 2018
Cognitive radio is an effective technology to improve spectrum utilization through spectrum sharing among primary users (PUs) and secondary users (SUs). Developing accurate and efficient methods to determine the PU coverage is crucial in order to avoid potential interference from SU to PU. In this paper, we propose to use the estimated location of each
Huaxia Wang, Yu-Dong Yao
openaire   +1 more source

Optimizing Secondary User Performance under Delay Constraint for Primary User

2017 IEEE Wireless Communications and Networking Conference (WCNC), 2017
We consider a cognitive radio network with one primary (PU), one secondary user (SU), and two distinct destinations. SU not only exploits the idle time slots (i.e. PU is not transmitting) to send its own packets, but also interfere with the PU with a certain probability that is optimized to maximize the stable throughput of the SU under a delay ...
Mohamed Salman, Lijun Chen 0001
openaire   +1 more source

Secondary User Satisfying Primary User Rate Constraint for Cognitive Radio

2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall), 2015
In this paper, we propose a generalized model for underlay based cognitive radio (CR) that is based on the information theoretic interference channel model. Utilizing the achievable rate region for the two user interference channel proposed by Han and Kobayashi, we establish achievable rates for the unlicensed or the Secondary User (SU) that depends ...
Aaqib Patel, S. N. Merchant, Md. Zafar Ali Khan, Uday B. Desai   +3 more
openaire   +1 more source