Basic and Applied Sciences

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These are scholarly outputs of the Faculty of Basic and Applied Sciences

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3-D Seismic Interpretation and Volumetric Estimation of “Osaja Field” Niger Delta, Nigeria
(International Letters of Natural Sciences, 2016) Lawson-Jack, Osaki; Iheanyichukwu, Opara A.; Njoku, Okereke C.; Petters, Adiela U.; Onyema, Njoku I.; Terhemba, Emberga T.; Ndidiamaka, Eluwa
3-D seismic interpretation and petrophysical analysis of the Osaja Field, Niger Delta, was carried out with aim of carrying out a detailed structural interpretation, reservoir characterization and volumetric estimation of the field. Four wells were correlated across the field to delineate the lithology and establish the continuity of reservoir sand as well as the general stratigraphy of the area. The petrophysical analysis carried out, revealed two sand units that are hydrocarbon bearing reservoirs (Sand_A and Sand_B).The spatial variation of the reservoirs were studied on a field wide scale using seismic interpretation. Time and depth structural maps generated were used to establish the structural architecture/geometry of the prospect area of the field. The depth structure map revealed NE-SW trending anticlinal structures with F5 and F6 as faults assisted closures to the reservoir. Furthermore, reservoir parameters such as net pay, water saturation porosity, net-to-gross etc, were derived from the integration of seismic and well log data. The structural interpretation on the 3-D seismic data of the study area revealed a total of seven faults ranging from synthetic to antithetic faults. The petrophysical analysis gave the porosity values of the reservoir Sand_A ranging from 18.1 - 20.3% and reservoir Sand_B ranging from 13.1-14.9% across the reservoir. The permeability values of reservoir Sand_A ranging from 63-540md and reservoir Sand_B ranging from 18-80md hence there is decrease in porosity and permeability of the field with depth.The net-to-gross varies from 22.1% to 22.4% in Rerservoir Sand A to between 5.34- 12% for Rerservoir Sand _A while Sw values for the reservoirs ranges from 38-42% in well 2 to about 68.79-96.06% in well 11. The result of original oil in place for all the wells calculated revealed that well 2 has the highest value with 9.3mmbls. These results indicate that the reservoirs under consideration have a poor to fair hydrocarbon (oil) prospect.
3D Geomechanical reservoir model for Appraisal and Development of Emi-003 field In Niger Delta, Nigeria
(Ajast, 2018-12) Lawson-Jack, Osaki; Uko, Etim D.; Opara, Alex
In this paper, geomechanical parameters were effectively integrated in 3-D geostatic model of Emi-003 reservoir in the Niger Delta basin, Nigeria for deformability and rock strength appraisal using well logs and 3D seismic volume. Unconsolidated sandstone and compacted shale were delineated and evaluated by determined elastic moduli (Poisson ratio, Young modulus, Bulk modulus, Shear modulus and Compressibility) and the Unconfined compressive strength (UCS) using sonic logs and petrophysical analysis, correlations and cross plots for comparison of the evaluated reservoir strength, physical properties (such as modulus, porosity, velocity) of the five mapped zones from five vertical wells in the studied reservoir for validation were done. Finally, incorporation of elastic properties, unconfined compressive strength in 3D static model of the studied reservoir was carried out to capture strong lateral variance of rock elastic moduli and strength into areas where well control may not exist. especially off the well points. The results show average parameters of the weakly cemented sand to have lower Poisson ratio, Young, Bulk, Shear modulus and Unconfined compressive strength (0.27, 2.3GPa, 10.8GPa, 6.91GPa, 14.21MPa respectively,) high compressibility and porosity (0.13 GPa-1, 0.26) conversely the compacted shale have higher Poisson ratio, Young, Bulk, Shear modulus and rock strength as (0.36, 8.91GPa, 18.05GPa, 21.09GPa, 56.44MPa respectively) lower compressibility and porosity (0.05 GPa-1, 0.05 respectively). There is a marked increase of rock strength and elastic moduli with relative decrease in porosity. The mechanical failure in the NNW direction of the reservoir will be relatively lower than other areas as analyse using the 3D earth model. The information gathered will help manage reservoir stress and strain induced during development and maximize reservoir performance, while mitigating risk.
A Cancelable Biometric Based Security Protocol for Online Banking System
(International Journal of Computer Science and Information Security, 2020-06) Tom, Joshua J.; Alese, Boniface K.; Thompson, Aderonke F.
The internet revolution has brought significant benefits to humanity. Undeniably, most businesses in both the public and private sectors now provide their services online through the internet. One of the businesses that have embraced the use of the internet to provide services to their customers is the banking sector. Banks obtain competitive advantage and increased productivity through the adoption of online banking. Bank customers enjoy online banking as it provides them with anytime, anywhere banking experience. Away from the benefits is the issue of security of customer transaction data and customer privacy. Many authors have proposed various solutions to address the online banking security problem but while some focus solely on client authentication, others dwell only on security of the data transfer channels. In this paper, we propose a cancellable biometric based authentication protocol which guarantees secure mutual authentication, customer privacy and offer a secure end-to-end transmission of customer transaction data. The protocol in this paper is designed using Biohashing, a biometric template protection technique and dual cryptographic algorithm that combines Advanced Encryption Standard (AES) and Data Encryption Standard algorithms. With these, we realized strong authentication and secure transaction information exchange protocol for online banking
A communal catalogue reveals Earth’s multiscale microbial diversity
(Nature Publishing Group, 2017-11-01) Osuolale, Olayinka; Thompson, Luke; The Earth Microbiome Project Consortium; Knight, Rob; Gilbert, Jack; Jansson, Janet; Ackermann, Gail; Kosciolek, Tomasz; Gibbons, Sean
Our growing awareness of the microbial world’s importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple studies and allow us to explore patterns of diversity at an unprecedented scale. The result is both a reference database giving global context to DNA sequence data and a framework for incorporating data from future studies, fostering increasingly complete characterization of Earth’s microbial diversity
A Comparative Study of Biosurfactant Synthesis by Pseudomonas aeruginosa Isolated from Clinical and Environmental Samples
(Taylor & Francis Group, 2012-02-15) Agwu, O. A.; Ilori, Matthew O.; Adebusoye, S. A.; Amund, Olukayode O.
Evaluation of emulsifying activities indicates that biosurfactants were produced by an environmental (strain EP1) and a clinical (strain CP1) species of Pseudomonas aeruginosa. During growth on hydrocarbons, the organisms produced biosurfactants. Both strains grew luxuriantly on motor oil and readily synthesized abundant surfactants at the expense of easily metabolizable substrates. During a 12-day cultivation on motor oil, the organisms produced growth-associated extracellular surfactants with emulsification activities of 71 and 38% for EP1 and CP1, respectively. The generation times obtained for EP1 and CP1 were 1.74 and 2.66 days. The biosurfactants that could not be secreted on glucose were partially purified and putatively identified as rhamnolipids. The surface-active compounds present high emulsification activity and stability in the pH range of 3.0–10.0, temperature range of 4°C–100°C, and salinity range of 16–44% and are capable of stabilizing oil-in-water emulsions with several hydrocarbons. Typical emulsions produced were stable for several weeks. The results also showed that the biosurfactants were able to remove a significant amount of crude oil from contaminated soil; for instance, strain EP1 surfactant removed 54%, CP1 41%, detergent 42%, and water 30%. The rhamnolipids from these strains represent a new class of biosurfactants that have potential for use in a variety of biotechnological and industrial applications where extremes of pH, thermal, and saline conditions would have little or no effect on activity.
A comparative study of serum ferritin and other acute phase reactants (APR) in minor and major surgery
(Academic Journals, 2009-12-31) Asaolu, M. F.; Oyeyemi, A. O.; Fakunle, Julius B.
This study was carried out on serum ferritin, acute phase reactants (APR), iron (Fe) and total iron binding capacity (TIBC) in healthy women in Ado Ekiti, Nigeria and in female patients undergoing suture (minor operation) and ceaserean operations at the Obafemi Awolowo University Teaching Hospital Complex, Ile-Ife, Nigeria between February and March, 2009. The results revealed post-operative serum ferritin and APR concentrations to be significantly higher (p> 0.01) while iron and TIBC were significantly lower in patients undergoing caesarean operation compared to both patients with minor operation and healthy women. The pre-operative results of serum ferritin were however significantly lower in patient undergoing major operation than in patients with minor operation. The present study was carried out to examine the changes in serum ferritin and other acute phase reactants in response to the magnitude of tissue damage. It can be concluded that the concentrations of serum ferritin and acute phase reactant increases as the magnitude of tissue damages increases. There is an acute phase response of serum ferritin levels following major surgery.
A Context-Adaptive Ranking Model for Effective Information Retrieval System
(International Journal of Information Science, 2018) Agbele, Kehinde K.; Ayetiran, Eniafe; Babalola, Olusola
Abstract When using Information Retrieval (IR) systems, users often present search queries made of ad-hoc keywords. It is then up to information retrieval systems (IRS) to obtain a precise representation of user’s information need, and the context of the information. Context-aware ranking techniques have been constantly used over the past years to improve user interaction in their search activities for improved relevance of retrieved documents. Though, there have been major advances in context-adaptive systems, there is still a lack of technique that models and implements context-adaptive application. The paper addresses this problem using DROPT technique. The DROPT technique ranks individual user information needs according to relevance weights. Our proposed predictive document ranking model is computed as measures of individual user search in their domain of knowledge. The context of a query determines retrieved information relevance. Thus, relevant context aspects should be incorporated in a way that supports the knowledge domain representing users’ interests. We demonstrate the ranking task using metric measures and ANOVA, and argue that it can help an IRS adapted to a user's interaction behaviour, using context to improve the IR effectiveness.
A Dependable Model for Attaining Maximum Authentication Security Procedure in a Grid Based Environment
(Trends in Applied Sciences Research, 2012) Agbele, Kehinde K.; Azeez, N. A.; Abidoye, A. P.; Adesina, A. O.
Grid computing is an emergent computing innovation which offers endless access to computing infrastructure across various organizations (academia and industry). Since this technology allows aggregation of various computer systems for usage by different users to run applications, the information stored on it which may be sensitive and private, remains vulnerable. According to related research on the attribute based access control for grid computing there is no adequate and appropriate security mechanism to authorize and authenticate users before accessing information on a grid system. The issue of security in grid technology has not been fully addressed even though it is a precondition for optimizing grid usability. Having realized the paucity of security guarantees, this research work focuses on developing a model for securing data and applications deployed on a grid on the basis of double identity authentication and public key. The implementation of the model has undoubtedly guaranteed the security of sensitive information on a grid vis-a-vis strict adherence to security policies and protocols.
A global metagenomic map of urban microbiomes and antimicrobial resistance
(Cell Journal by Elsevier, 2021-05-26) Osuolale, Olayinka O.; Danko, David; Bezdan, Daniela; et al
We present a global atlas of 4,728 metagenomic samples from mass-transit systems in 60 cities over 3 years, representing the first systematic, worldwide catalog of the urban microbial ecosystem. This atlas provides an annotated, geospatial profile of microbial strains, functional characteristics, antimicrobial resistance (AMR) markers, and genetic elements, including 10,928 viruses, 1,302 bacteria, 2 archaea, and 838,532 CRISPR arrays not found in reference databases. We identified 4,246 known species of urban microorganisms and a consistent set of 31 species found in 97% of samples that were distinct from human commensal organisms. Profiles of AMR genes varied widely in type and density across cities. Cities showed distinct microbial taxonomic signatures that were driven by climate and geographic differences. These results constitute a highresolution global metagenomic atlas that enables discovery of organisms and genes, highlights potential public health and forensic applications, and provides a culture-independent view of AMR burden in cities.
A Mathematical Model for the Transmission of HIV/AIDS with Early Treatment
(Journal of Advances in Mathematics and Computer Science, 2021) Akinwumi, T. O.; Olopade, I. A.; Adesanya, A. O.; Alabi, M. O.
In this paper, a mathematical model for the transmission of HIV/AIDS with early treatment is developed and analyzed to gain insight into early treatment of HIV/AIDS and other epidemiological features that cause the progression from HIV to full blown AIDS. We established the basic reproduction number which is the average number of new secondary infection generated by a single infected individual during infectious period. The analysis shows that the disease free equilibrium is locally and globally asymptotically stable whenever the threshold quantity is less than unity i.e. Numerical analysis shows that the early treatment of latently infected individuals reduces the dynamical progression to full blown AIDS. The result also showed that immunity boosted substances increase the red blood cells, sensitivity analysis of basic reproduction number with respect to parameters showed that effective contact rate must not exceed 0.3 to avoid endemic stage.
A Multiple Linear Regression Model for Analyzing and Predicting Educational Development in Nigeria
(NIPES Journal of Science and Technology Research, 2021-03) Orogun, A.O.; Ariyo, O.E; Ajayi, O.O.; Onyekwelu, B.
This paper explores the application of machine learning for predicting educational development in Nigeria, to determine its progress or regress in Ondo State. Numerous factors impact the performance of educational organizations, viz; infrastructure, learning condition, student ability, the immediacy of teachers, methods of educating and learning, research centers, grounds areas, and so forth served as the variable used for the prediction. The data for the study was obtained from Nigeria Education Digest Statistics Indicator 2005-2016, Ondo State Demographic Digest Statistics 2009. The study developed a predictive model using multiple linear regression, which considers the various factors that determines the progress of education in Nigeria. The result of the evaluation of the model shows that a somewhat rise in the educational development in the country, with regards to the feature attributes considered. The model showed that literacy rate has a higher correlation coefficient of 0.22.
A Naive Bayes approach to fraud prediction in loan default
(IOP Conf. Series: Journal of Physics: Conf. Series, 2019) Eweoya, Ibukun; Adebiyi, A A; Azeta, A A; Chidozie, F; Agono, F O; Guembe, B
The essence of granting loans to individuals and corporate beneficiaries is to boost the economy while the lenders make profit from the interest that accrues to the lending. However, due to non-compliance to basic rules, fraud is prevalent in credit administration and traditional methods of detecting fraud have failed. Furthermore, they are time-consuming and less accurate. This work uses a supervised machine learning approach, specifically the Naïve Bayes to predict fraudulent practices in loan administration based on training and testing of labeled dataset. Previous works either predict credit worthiness or detect loan fraud but not predicting fraud in credit default. The approach employed in this work yielded 78 % accuracy.
A Neuro-Fussy Based Model for Diagnosis of Monkeypox Diseases
(International Journal of Computer Science Trends and Technology (IJCST), 2018) Tom, Joshua J.; Anebo, Nlerum P.
The largest vertebrate viruses known, infecting humans, and other vertebrates are poxviruses including cowpox, vaccinia, variola (smallpox), and monkeypox viruses. Monkeypox was limited to the rain forests of central and western Africa until 2003. A smallpox-like viral infection caused by a virus of zoonotic origin, monkeypox belongs to the genus Orthopoxvirus, family Poxviridae, and sub-family Chordopoxvirinae. Monkeypox has a clinical presentation like ordinary forms of smallpox, including flulike symptoms, fever, malaise, back pain, headache, and characteristic rash. In view of the eradication of smallpox, such symptoms in a monkepox endemic region should be carefully diagnosed. The problem in diagnosing monkeypox lies in the fact that it is clinically indistinguishable from other pox-like illnesses making virus differentiation difficult. In this paper, we present a neuro-fuzzy based model for early diagnosis of monkeypox virus with a differentiation from other pox families.
A Novel Document Ranking Algorithm That Supports Mobile Healthcare Information Access Effectiveness
(Academic Journals Inc., 2011) Agbele, Kehinde K.; Adesina, Ademola O.; Azeez, Nureni A.; Abidoye, Ademola P.; Febba, Ronald
This study presented DROPT; an acronym for Document ranking Optmization algorithm approach, a new idea for the effectiveness of meaningful retrieval results from the information source. Proposed method extracted the frequency of query keyword terms that appears within the user context of Frequently Asked Questions (FAQ) systems on HIV/AIDS content related-documents. The SMS messages were analyzed and then classified, with the aim of constructing a corpus of SMS related to HIV/AIDS. This study presented a novel framework of Information Retrieval Systems (IRS) based on the proposed algorithm. The developed DROPT procedure was used as an evaluation measure. This “Term Frequency-Inverse Document Frequency (TFIDF)” method was applied to obtain the experimental result that was found promising in ranking documents not only the order in which the relevant documents were retrieved, but also both the terms of the relevant documents in feedback and the terms of the irrelevant documents in feedback might be useful for relevance feedback, especially to define its fitness function (mean weight).
A novel routing algorithm for energy optimization in wireless sensor networks
(Research Journal of Information Technology, 2012) Abidoye, Ademola P.; Azeez, Nureni A.; Adesina, Ademola O.; Agbele, Kehinde K.
Wireless sensor networks (WSNs) have become an interesting area to researchers in recent times due to the low cost of sensor nodes, wide application areas and with low or no cost of maintenance after deployment in a target area. Sensor nodes are expected to remain in operation for a longer time without human intervention. However, due to the small size and cost of these nodes, they have been equipped with small batteries with limited energy source. This has been a major constraint to WSNs, since in most cases sensor nodes are deployed in large number where it may be difficult or impossible to replace the batteries of each node when they run out of supplying power. In this study, a novel Routing Algorithm for Energy Optimization in WSNs (RAEO) has been proposed to reduce communication distance among the nodes by transmitting sensed data through the shortest path from source node to the base station along the neighbouring nodes. The simulation results show that our approach reduces energy consumption during data transmission and increases networks lifetime compared with MECN and SPIN protocols. Finally, the proposed algorithm reduces protocol propagation delay and packets loss during data transmission.
A Query-Based SMS Translation in Information Access System
(International Journal of Soft Computing and Engineering (IJSCE), 2011-11) Agbele, Kehinde K.; Adesina, Ademola O.; Nureni, Azeez A.; Abidoye, Ademola P.
Mobile technology has contributed to the evolution of several media of communication such as chats, emails and short message service (SMS) text. This has significantly influenced the traditional standard way of expressing views from letter writing to a high-tech form of expression known as texting language. In this paper we investigated building a mobile information access system based on SMS queries. The difficulties with SMS communication were explored in terms of the informal communication passage and the associated difficulty in searching and retrieving results from an SMS-based web search engine under its non-standardization. The query is a pre-defined phrase-based translated English version of the SMS. The SMS machine tool normalization algorithm (SCORE) was invented for the query to interface with the best ranked and highly optimized results in the search engine. Our results, when compared with a number of open sources SMS translators gave a better and robust performance of translation of the normalized SMS.
A study of bacteria from the digestive system of two advanced termites (Isoptera, Termitidae) in Nigeria
(1986) Amund, Olukayode O.; Yakubu, O. S.; Malaka, S. L. O.
1. The total heterotrophic counts of bacteria present in the digestive system of Macrotermes bellicosus Smeathman and Amitermes evuncifer Silvestri were carried out. 2. The populations of bacteria in the guts of workers were generally higher than in those of soldiers. 3. A total of nineteen bacterial strains belonging to four main genera, namely Cytophaga, Micrococcus, Bacillus and Sarcina were isolated; six of these organisms were capable of producing cellulose-digesting enzymes. 4. The possible role of these cellulolytic bacteria in termite nutrition was discussed.
A study of Microbial composition and Lignocellulose degradation in the mound soil of Macrotermes bellicosus Smeathman.
(1998) Amund, Olukayode O.; Onumonu, M. N.; Onawale, T. A.; Malaka, S. L. O.
Mound soil samples of Macrotermes bellicosus Smeathman and the adjacent soils were examined for total heterotrophic bacteria, yeasts, moulds, actinomycetes, nitrogen fixers and cellulose decomposers. There were higher populations of the various microbial groups in the mound soil than in the adjacent soils with the exception of yeasts. In the mound soil were Klebsiella, Micrococcus, Aeromonas, Flavobacterium, and Bacillus. The yeasts were Candida, Rhodororula and Torulopsis, whilst the moulds were capable of utilizing lignin and cellulosic substrates for growth with the production of cellulolytic enzymes. Growth of Aspergillus oryzae and Mycelia sterilia on wood dust resulted in substantial weight loss, carbohydrate and lignin depletion of the wood residues. The significance of fungal delignification in relation to termite nutrition is emphasized and discussed.
A study of tannic acid degradation by soil bacteria.
(Science Alert, 2007) Ilori, Matthew O.; Adebusoye, Sunday A.; Amund, Olukayode O.; Oyetoran, Bodunde O.
A tannin-degrading strain of Bacillus sp. AB1 was isolated from a garden soil by enrichment. This organism was able to utilize 1% (w/v) tannic acid-a gallotannin at 30°C and pH below 4.5 in a defined mineral medium where the acid was the sole source of carbon and energy under 96 h. Growth resulted in increase in OD concomitant with gradual decrease in pH of the culture medium. Analysis of the culture fluid by paper chromatography revealed glucose and gallic acid as major metabolites of tannic acid degradative pathway. Mineralization of tannic acid was informed when none of the metabolites was recovered after 96 h of incubation. The degradation potential of this isolate could be exploited for the production of tannase, improvement of livestock production and also detoxification of tannery effluents at extreme acidic conditions.
A Systematic Literature Review of Mobile Cloud Computing
(International Journal of Multimedia and Ubiquitous Engineering, 2015) Eweoya, Ibukun; Olawande, Daramola
Mobile cloud computing (MCC) is a relatively new concept that leverages the combination of cloud technology, mobile computing, and wireless networking to enrich the usability experiences of mobile users. Many field of application such as mobile health, mobile learning, mobile commerce and mobile entertainment are now taking advantage of MCC technologies. Since MCC is new, there is need to advance research in MCC in order to deepen practice. Currently, what exist are mostly descriptive literature reviews in the area of MCC. In this paper, a systematic literature review (SLR), which offers a structured, methodical, and rigorous approach to the understanding of the trend of research in MCC, and the least and most researched issue is presented. The objective of the study is to provide a credible intellectual guide for upcoming researchers in MCC to help them identify areas in MCC research where they can make the most impact. The SLR was limited to peer-reviewed conference papers and journal articles published from 2002 to 2014. The study reveals that privacy, security and trust in MCC are the least researched, whereas issues of architecture, context awareness and data management have been averagely researched, while issues on operations, end users, service and applications have received a lot of attention in the literature.

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