Wireless Sensor Networks (WSNs): Security and Privacy Issues and Solutions

Wireless sensor networks (WSNs) have become one of the current research areas, and it proves to be a very supportive technology for various applications such as environmental-, military-, health-, home-, and office-based applications. WSN can either be mobile wireless sensor network (MWSN) or static wireless sensor network (SWSN). MWSN is a specialized wireless network consisting of considerable number of mobile sensors, however the instability of its topology introduces several performance issues during data routing. SWSNs consisting of static nodes with static topology also share some of the security challenges of MWSNs due to some constraints associated with the sensor nodes. Security, privacy, computation and energy constraints, and reliability issues are the major challenges facing WSNs, especially during routing. To solve these challenges, WSN routing protocols must ensure confidentiality, integrity, privacy preservation, and reliability in the network. Thus, efficient and energy-aware countermeasures have to be designed to prevent intrusion in the network. In this chapter, we describe different forms of WSNs, challenges, solutions, and a point-to-point multi-hop-based secure solution for effective routing in WSNs

Lithostructural description and metalogeny of Alagbede gold deposit, West Central Nigeria

Alagbede gold deposit located about 25km northwest of Malete in Moro Local Government Area of Kwara State, West Central Nigeria consists of gold-bearing quartz veins as stringers set in metasediments (quartzites and talc schist) overlying the migmatite gneiss basement. It is a southern extension of the northwestern end of Yauri goldfield, resulting from the development of the intercontinental Anka-Yauri-Iseyin (AYI) transcurrent fault during the Pan-African. Evidence of granitization abounds within the gneisses of the area. Structural features mapped in the area include folds, faults and joints. Discordant and concordant shear planes are partly healed with vein quartz ranging from 2-8m depth. The ongoing study indicates the preponderance of a reducing environment of sulphide association with fine-grained gold in vein quartz and schitose rocks. The general NNE to SSW trends suggest a temporal and spatial correlation with other Nigeria goldfields. Keywords: Gold, Deposit, Metasediments, Transcurrent, Fault, Sulfide

Massive sublingual bronchogenic cyst with airway compromise

Bronchogenic cysts are primary cysts of the mediastinum. In rare situations, it can present in the oral cavity as a swelling of the tongue and the floor of the mouth. Usually, it is not a life-threatening clinical entity. In this report, we present a massive sublingual bronchogenic cyst with life-threatening clinical characteristics in an adult patient of a Nigerian tertiary-level medical center and the management of the case

Logistic regression showing the relationship between job description versus SARS-CoV-2 seroprevalence and SARS-CoV-2 positivity.

Logistic regression showing the relationship between job description versus SARS-CoV-2 seroprevalence and SARS-CoV-2 positivity.</p

Participants’ demographics versus SARS-CoV-2 Serological test IgG (ABBOTT).

Participants’ demographics versus SARS-CoV-2 Serological test IgG (ABBOTT).</p

Description of COVID-19 PCR and SARS-CoV-2 serological tests results stratified by different participants’ demographics.

Description of COVID-19 PCR and SARS-CoV-2 serological tests results stratified by different participants’ demographics.</p

Comparison between participant’s demography and COVID-19 PCR results.

Comparison between participant’s demography and COVID-19 PCR results.</p