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Capacity Optimization In Cooperative Cognitive Radio Networks

Mahdi Pirmoradian, Olayinka Adigun, Christos Politis
2015 Zenodo  
Olayinka Adigun and Christos Politis are with WMN Research Group Kingston University, London, UK (e-mail:,  ... 
doi:10.5281/zenodo.1338304 fatcat:hvogditgsjdeno24nv32qy6l6e

Choice of Anaesthetic Technique for Delivery of Pregnancy Complicated by Placenta Previa in Ibadan

Adigun TA, Tinuola Abiodun Adigun, Olayinka Eyelade
2012 Journal of Anesthesia & Clinical Research  
anaesthesia while 16⁄58 had stable blood pressure and were done under spinal anaesthe-Choice of Anaesthetic Technique for Delivery of Pregnancy Complicated by Placenta Previa in IbadanAdigun TA* and Olayinka  ... 
doi:10.4172/2155-6148.1000205 fatcat:yck3gki6bbhjxd4xbnosfwf4py

Sensing Optimization in Cooperative Cognitive Radio Networks

Mahdi Pirmoradian, Olayinka Adigun, Christos Politis
2014 Procedia Computer Science  
Cooperative spectrum sensing is a key function in cognitive radio networks in order to provide unused spectrum access opportunities and mitigate the impact of interference to the primary networks. Cooperative sensing can incur additional cooperation overhead, increased energy consumption, extra sensing time and delay in heterogeneous networks. In this paper, the sensing time period is optimized to minimize energy consumption in a diverse cooperative network using square law combining decision
more » ... le. The evaluation results confirm significant improvement in the sensing time and sensing task energy consumption.
doi:10.1016/j.procs.2014.07.075 fatcat:gjvg4zsanzfq5bh2jwwrm3tlyi

Adaptive Spectrum Opportunity Access in Cognitive Radio Networks

Mahdi Pirmoradian, Olayinka Adigun, Christos Politis
2013 Journal of Networks  
This paper presents the Adaptive Spectrum Opportunity Access (ASOA) scheme. The proposed scheme greatly improves spectrum utilization and provides improved QoS for the secondary users. The secondary data delivery time is adapted in different spectrum opportunities through ASOA scheme based on the estimated collision rates in a sophisticated way. The performance evaluations in terms of the channel utilization, channel collision, secondary data delivery and handoff rates are assessed and compared
more » ... with the Maximum Idle Channel Remaining Lifetime (MICRL) schemes. The simulation results confirm the viability of the ASOA scheme in comparison with MICRL schemes.
doi:10.4304/jnw.8.4.747-754 fatcat:xhpz6eaknrhv3mo34zpq3krtci

Entropy-based opportunistic spectrum access for cognitive radio networks

Mahdi Pirmoradian, Olayinka Adigun, Christos Politis
2014 Transactions on Emerging Telecommunications Technologies  
ACKNOWLEDEMENTS The authors acknowledge contribution from their colleagues, in particular Olayinka Adigun for reading the manuscript and his comments.  ... 
doi:10.1002/ett.2886 fatcat:d4eyy5p7mvhc5fkd6qjruoxe5u

Control Techniques and Power Factor Correction Methods: A Review

Ganiyu Adedayo Ajenikoko, Oluwatomi Adigun, Amend Olayinka Rafiu
2018 Journal of Engineering Research and Reports  
The ratio of real power flowing into the load to the apparent power in a circuit is referred to as the power factor (PF). It has no unit as its values lie between 0 and 1. Power factor correction (PFC) leads to a reduction in apparent power drawn from the ac source which in turn saves energy and minimizes the transmission losses. This paper reviews various methods used for PFC as well as the various control measures for power factor. The correction methods include distributed PFC, group PFC,
more » ... tralized PFC and combined PFC. Distributed PFC is applicable to large electrical equipment with constant load and power with long connection times. Combined PFC is the hybrid between a distributed and a centralized correction method. Peak current control technique makes use of constant switching frequency even though, the presence of sub-harmonic oscillations at a duty cycle greater than 50% is a disadvantage. The presence of constant switching frequency and better input current waveforms are some of the applications of average current control. In the discontinuous current pulse width modulation (PWM) control, the internal current loop is completely eliminated so that the switch is at a constant frequency. In nonlinear carrier controllers, the duty ratio is determined by comparing a signal derived from the main switch current with a periodic nonlinear carrier waveform. Therefore, combined PFC and nonlinear carrier controllers are more accurate PFC methods for the power plant because they employ a high power factor boost converter with low total harmonic distortion for installations of large equipment with a constant load. This research paper forms a basis for power system planning as it assists in recommending the appropriate and adequate technique(s) for correcting and controlling the pf of the factory.
doi:10.9734/jerr/2018/v2i19883 fatcat:hyriwalzm5fv5c4s2q7h7kuobm

Caudal Anaesthesia in Ambulatory Colonoscopy: Lidocaine Only vs. Lidocaine/fentanyl Combination

Olufemi O Adejumo, Olayinka R Eyelade, Tinuola A Adigun, Adegboyega A Akere
2017 Journal of Anesthesia & Clinical Research  
This study aimed to compare the analgesic effects of caudal anaesthesia in patients undergoing ambulatory colonoscopy using lidocaine only or lidocaine/fentanyl combination. Methods: Fifty-one consecutive adult patients scheduled for colonoscopy participated in the study. Participants were randomly allocated into two equal groups (A and B). Caudal anaesthesia was instituted in both groups with 1.5% preservative free lidocaine (19.4 ml); 0.6 ml of normal saline was added in Group A and 30 mcg of
more » ... fentanyl made to 0.6 ml in Group B. The time of onset and height of caudal block, Numeric Pain Rating Scale (NPRS) score at different stages during colonoscopy were evaluated and compared. The number of patients requiring rescue analgesia (fentanyl/midazolam) were also evaluated and compared. Results: Twenty-six patients in the saline-lidocaine group (A) and twenty-five patients in the fentanyl-lidocaine group (B) completed the study. The mean and standard deviation of the caudal block onset time (minute) in group A was 11.71 ± 4.26 comparable to group B which was 13.50 ± 4.85, p=0.15. The median NPRS while navigating the splenic flexure was 2 in group A and 3 in group B; and while navigating the hepatic flexure it was 5 in group A and 3 in group B. But p values are 0.285 and 0.031 respectively. Rescue analgesia was employed in fewer number of patients in group B (16%) compared to group A (34.6%). Conclusion: Caudal epidural block with lidocaine/fentanyl combination provided superior, safe and satisfactory anaesthesia for ambulatory colonoscopy.
doi:10.4172/2155-6148.1000764 fatcat:gmc66sene5gvng5y3vfc54vdsi

Towards a scalable routing approach for Mobile Ad-hoc Networks

Tipu A. Ramrekha, Olayinka Adigun, Alexandros Ladas, Nuwan Weerasinghe, Christos Politis
2015 2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (CAMAD)  
The Internet is evolving towards a two-fold architecture that will comprise of traditional infrastructure based networks as well as emerging self organised autonomic peripheral networks. Such Internet peripheral networks are being termed as the Internet of things (IoT) whereby smart objects and devices will be connected together in a fully distributed fashion to provide ubiquitous services through pervasive networking. Mobile Ad hoc Networks (MANETs) is regarded as one of the pervasive
more » ... nised networks that will play a major role in autonomic future internet communication. There are several wellknown challenges to be addressed in order to enable MANET deployments of large islands of interconnected smart devices. Therefore, in this paper, we perform simulations using the ns-2 software, for various well-known routing protocols for MANETs in order to determine the scalability of these protocols. This paper analyses the scalability of the routing protocols with respect to routing overhead required by approaches while also considering the packet delivery latency, which is an important Quality of Service (QoS) metric.
doi:10.1109/camad.2015.7390521 dblp:conf/camad/RamrekhaALWP15 fatcat:267uyi3mt5gb3jrvlhhhba5yky


2014 Procedia Computer Science  
Adigun, Christos Politis TELEMODE -A proposal towards Technology Enhanced Learning, Engineered with MObile DEvices Vijayarengan Ramanuja Chary A Semantic Approach for Service Adaptation in Context-Aware  ...  Virtual Machine Resource Allocation for Multimedia Cloud: A Nash Bargaining Approach Mohammad Mehedi Hassan, Atif Alamri Sensing Optimization in Cooperative Cognitive Radio Networks Mahdi Pirmoradian, Olayinka  ... 
doi:10.1016/j.procs.2014.07.001 fatcat:xjqjjfc5mzdcpfexqmuk7rygdm

Anaesthetic Management of the Elderly with Low Ejection Fraction Undergoing Non-cardiac Surgery

O.F. Salami, K.M. Onuoha, P.K. Uduagbamen, B.A. Olayinka, O.A. Alade
2020 Research Journal of Health Sciences  
. , Olayinka B.A. , Alade O.A. . Eur J Anaesthesiol 2014; 31(10): 517epidural blockade offers stability in patients with 573. cardiovascular diseases. A combination of both offers 3.  ...  Eyelade O, Sanusi A, Adigun T, Adejumo O. an early block and a continuous top-up dose to Outcome of anaesthesia in elective surgical maintain adequate cardiac stability and anaesthesia. patients with comorbidities  ... 
doi:10.4314/rejhs.v8i3.7 fatcat:j3xff6k2mjgtdfeioqdeupctta

Introduction pages

2016 Notulae Scientia Biologicae  
ADIGUN, Abeeb Abiodun YEKEEN, Oluwafemi O.  ...  FATTAHI, Abbas HASSANI, Saber AVESTAN Effects of Ground and Unground Rice Straw on the Yield and Proximate Composition of Groundnut (Arachis hypogeae L.) 176-180 Abdul'Aziz Ayinla, Bolaji Umar OLAYINKA  ... 
doi:10.15835/nsb.8.2.9854 fatcat:fhltuhxofvaclmw2gvck2pmbne

Comparative Growth Analysis and Fruit Quality of Two Varieties of Tomato under Hand Weeding and Pendimethalin Herbicide

B U Olayinka, O O Esan, I O Anwo, E O Etejere
2017 Journal of Agricultural Sciences  
Percentage yield loss in tomato as a result of weed infestation could range from 40 to 95 % (Adigun, 2000; Madueke et al., 2012) .  ...  Olayinka and Etejere (2015) had reported similar results in their studies of weed control methods in groundnut.  ... 
doi:10.4038/jas.v12i3.8262 fatcat:sle6f5lwlfd2nncpasqbh4mm2m

Effective Management of Private Schools in Nigeria: Necessity for Governments' Intervention

John Oluyemi Egbebi, Olayinka Tijani Wakili
2020 Randwick International of Education and Linguistics Science Journal  
: 2723-2441 John Oluyemi Egbebi, Olayinka Tijani Wakili  ...  As if this is not enough, learners' academic achievement in most of the private schools is found to be above that of government owned schools sometime (Yusuf and Adigun, 2010) .  ... 
doi:10.47175/rielsj.v1i2.87 fatcat:2lbsk3wo3zb6nfqqklvvxayqca

An impulse response function analysis of the impact of modern payment technologies on money demand in Nigeria

Tersoo David Iorngurum, Chukwudum Godwin Nwaobi
2021 Zenodo  
, point of sales terminals (PoS), web-based payment platforms, and mobile-based payment platforms have gained recognition as some of the core objectives of Nigeria's central banking system (Kama and Adigun  ...  basic financial services, and therefore needs these technologies in order aid the extension of digitized financial services from the urban developed financial sector to the rural undeveloped sector (Olayinka  ... 
doi:10.5281/zenodo.5658277 fatcat:zykoyf6lxjhw3n46z74ku3hbhi

Integrated geophysical and hydrochemical investigations of subsoil and groundwater pollution around three cassava processing factories at Ireti-Ayo community, Ilesha, Southwestern Nigeria

E. O. Adigun, M. O. Olorunfemi
2017 Ife Journal of Science  
Geophysical methods involving Vertical Electrical Sounding (VES) and 2D electrical resistivity imaging are relevant in the mapping of subsurface lithology and pollution plume (Amidu and Olayinka, 2006  ... 
doi:10.4314/ijs.v19i2.6 fatcat:6d42iz3zyrazxadxvv3wvne7ja
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