Performance Review of Selected Topology-Aware Routing Strategies for Clustering Sensor Networks

In this paper, cluster-based routing (CBR) protocols for addressing issues pertinent to energy consumption, network lifespan, resource allocation and network coverage are reviewed. The paper presents an indepth  performance analysis and critical review of selected CBR algorithms. The study is domain-specific and simulation-based with emphasis on the tripartite trade-off between coverage, connectivity and lifespan. The rigorous statistical analysis of selected CBR schemes was also presented. Network simulation was conducted with Java-based Atarraya discrete-event simulation toolkit while statistical analysis was carried out using MATLAB. It was observed that the Periodic, Event-Driven and Query-Based Routing (PEQ) schemes performs better than Low-Energy Adaptive Clustering Hierarchy (LEACH), Threshold-Sensitive Energy-Efficient Sensor Network (TEEN) and Geographic Adaptive Fidelity (GAF) in terms of network lifespan, energy consumption and network throughput.Keywords: Wireless sensor network, Hierarchical topologies, Cluster-based routing, Statistical analysis, Network simulatio

Histomorphological study of lead-induced lungs lesion of mice treated with Moringa oleifera leaves extracts

Background: Moringa oleifera leaves extracts are currently among the most common medicinal plants used to cure some diseases. Many studies have been conducted on the benefits of Moringa oleifera leaves extracts but only few studies focused on its Antifibrotic effects on lung tissue. Aim: To study the Histomorphological changes associated with Moringa oleifera Leave extracts on lead-induced lung lesion of Mice. Materials and Method: Twenty adult mice were divided into four groups, three test groups (A, B and C) and a control group (D). The test groups were administered orally with 5mg/kg lead acetate and 10mg/kg Moringa oleifera leaves extract concurrently; 5mg/kg lead acetate only; 10mg/kg Moringa oleifera leaves extract only; while the control group did not receive any intervention. The intervention period lasted for three weeks. On the twenty-two day of the research, the animals were sacrificed; lung tissues were harvested, processed for histological examination and stained using Hematoxylin and Eosin staining technique. Result: Group A animal administered with lead acetate and Moringa oleifera leaves extract concurrently, shows that the deleterious effects of Lead were ameliorated, with an improve histological features of the lungs when compared with that of the Group B. while an Ill defined alveoli, thinned alveoli wall, sacs emphysema and distortion of the parenchyma cells that constitute the lung tissue are seen in test Group B, administered with lead acetate only. A remarkable, intact lung alveoli, lung parenchyma cells were observed to in test Group C and very much correlated to that of the control group. Conclusion: Moringa oleifera administration reduced the severity of lead’s damaging effects to the lungs, and may likely exhibits anti-fibrotic as well as prophylactic effects by repairing damaged alveoli and in the latter case by preserving and /or regenerating the lung tubules. Key words: Anti-fibrotic; lead-induced; lung; lesion; Moringa oleifer

Dual Band Fractal Antenna Design for Wireless Application

The objective of this paper was to design and analyze a dual wide band compact antenna for wireless application. Microstrip patch antenna limitation was overcome by using fractal geometry. The proposed antenna was designed with a radius of 15mm on a FR4 lossy substrate with relative permittivity of 4.4 and loss factor of 0.025. Measurement result showed that the antenna has a dual band of operation with bandwidth for return loss below -10dB of 1.84GHz (2.2GHz-4.07GHz) and 2GHz (6GHz-8GHz) which can be applied to wireless local area network (WLAN) and Ultra wide band applications