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Search Results: 1 - 10 of 461262 matches for " A Adeosun "
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Traditional open surgery for advanced benign nasal tumours in an era of endoscopy: review of 38 cases.
AO Lasisi, A Adeosun
African Journal of Health Sciences , 2007,
Abstract: During the past decade open nasal surgery has been overtaken by endoscopic resection in the management of benign sinonasal tumours in the advanced countries. However, due to limited availability of endoscopic surgical facilities and training in most parts of sub-Saharan Africa, open surgery still seems popular. This report determines the indications and outcome of open nasal surgery for benign tumours in a resource – poor tertiary centre in sub-Saharan Africa and compares with endoscopic resection. This is retrospective study of 38 open surgeries done by the authors for cases of benign sinonasal tumours. Seventeen (45%) caldwel-luc procedures, 12 (31%) external (lynch-howarth) fronto-ethmoidectomy and 9(24%) lateral rhinotomy were carried out. The indications were simple nasal polyps 17(45%), mucocoele 10(26%), inverted paplloma 8(21%), invasive fungal sinusitis 2(5%) and ossifying fibroma 1(2%). Postoperatively, recurrence was 1/17(6%) caldwel-Luc surgery and 1/9 (11%) lateral rhinotomy for inverted papilloma. Facial scar was seen in 21/38(55%) but the cosmetic effect of the scars was acceptable to our patients. Postoperative stay was between 5 to 17 days. We conclude that open nasal surgery met the therapeutic expectations of our patients. The recurrence rate compared with that of endoscopic resection reported in the literature and cosmetic effect of facial scar was acceptable to the patients, however, postoperative stay in the hospital is longer. It is our hope that this will serve as a baseline to compare the result of endoscopic nasal surgery in future when it becomes a widespread procedure in the developing countries. African Journal of Health Sciences Vol. 14 (1-2) 2007: pp. 44-48
Optimum Calcium Carbonate Filler Concentration for Flexible Polyurethane Foam Composite  [PDF]
M. A. Usman, S. O. Adeosun, G. O. Osifeso
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.113023
Abstract: The production cost of flexible polyurethane foam is significantly dependent on the cost of polyol, which constitute the largest percentage of materials used in foam production with the characteracterics to induce superior mechanical properties. Suitable fillers that are relatively cheap can be introduced in the foam matrix as replacement for polyol. However, certain compositions of filler have deleterious effect on some relevant mechanical properties of the foam. This paper investigates the effect of CaCO3 filler in flexible polyurethane foam matrix for the dual purposes of achieving sustained mechanical properties and reduction in production cost. The optimum CaCO3 composition was found to be 20 wt % representing a concomitant 18.54% reduction in cost of production.
A Semi-Analytical Method for Solutions of a Certain Class of Second Order Ordinary Differential Equations  [PDF]
S. O. Edeki, H. I. Okagbue, A. A. Opanuga, S. A. Adeosun
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513196
Abstract:

This paper presents the theory and applications of a new computational technique referred to as Differential Transform Method (DTM) for solving second order linear ordinary differential equations, for both homogeneous and nonhomogeneous cases. For the robustness and efficiency of the method, four examples are considered. The results indicate that the DTM is reliable and accurate when compared to the exact solutions of the solved problems.

Predictors of hearing loss in school entrants in a developing country
Olusanya Bola,Okolo A,Adeosun A
Journal of Postgraduate Medicine , 2004,
Abstract: Background: Hearing loss is a prevalent and significant disability that impairs functional development and educational attainment of school children in developing countries. Lack of a simple and practical screening protocol often deters routine and systematic hearing screening at school entry. Aim: To identify predictors of hearing loss for a practical screening model in school-aged children. Settings and Design: Community-based, retrospective case-control study of school entrants in an inner city. Methods: Results from the audiologic and non-audiologic examination of 50 hearing impaired children in randomly selected mainstream schools were compared with those of a control group of 150 normal hearing children, matched for age and sex from the same population. The non-audiologic evaluation consisted of medical history, general physical examination, anthropometry, motor skills, intelligence and visual acuity while the audiologic assessment consisted of otoscopy, audiometry and tympanometry. Statistical Analysis: Multiple logistic regression analysis of significant variables derived from univariate analysis incorporating student t-test and chi-square. Results: Besides parental literacy (OR:0.3; 95% CI:0.16-0.68), non-audiologic variables showed no association with hearing loss. In contrast, most audiologic indicators, enlarged nasal turbinate (OR:3.3; 95% CI:0.98-11.31), debris or foreign bodies in the ear canal (OR:5.4; 95% CI:1.0-36.03), impacted cerumen (OR:6.2; 95% CI:2.12-14.33), dull tympanic membrane (OR:2.2; 95% CI:1.10-4.46), perforated ear drum (OR:24.3; 95% CI:2.93-1100.17) and otitis media with effusion OME (OR:14.2; 95% CI:6.22-33.09), were associated with hearing loss. However, only parental literacy (OR:0.3; 95% CI:0.16-0.69), impacted cerumen (OR:4.0; 95% CI:1.66-9.43) and OME (OR:11.0; 95% CI:4.74-25.62) emerged as predictors. Conclusion: Selective screening based on the identification of impacted cerumen and OME will facilitate the detection of a significant proportion of hearing impaired school entrants.
Effects of Heat Treatment on Strength and Ductility of Rolled and Forged Aluminum 6063 Alloy  [PDF]
S. O. Adeosun, S.A. Balogun, O.I. Sekunowo, M.A. Usman
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.98054
Abstract: This work examines the effect of heat treatment on tensile strength and ductile responses of rolled and forged AA6063 aluminum alloy. Some cast samples were rolled while some were forged at ambient temperature (32℃). The deformed samples were subjected to heat treatment processes. The tensile strengths of rolled (212 MPa) and forged (127 MPa) samples are enhanced at ambient temperature but with poor elongation responses. A combination of improved strength and elongation (127 MPa, 24%) can be obtained in rolled sample when solution heat treatment (SHT) is applied after deformation and cooling in water. The forged sample when homogenized, solution treated and water quenched has elongation of about 24% with improved strength of 137 MPa. These results were obtained because of the development of very fine AlFeSi texture in the matrix and along the grain boundaries.
Effect of Deformation on the Mechanical and Electrical Properties of Aluminum-Magnesium Alloy  [PDF]
S. O. Adeosun, O. I. Sekunowo, S.A. Balogun, L.O. Osoba
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.106042
Abstract: This paper presents the effect of deformation on the tensile strength, toughness, hardness and electrical resistance of aluminum 6063 alloy. Cast samples were cold rolled in the range of 0-24 percent thickness reduction and subjected to mechanical (static, dynamic) and electrical resistance tests. Results show significant improvement in hardness and electrical resistance properties of the alloy. The nature, amount and distribution of the secondary phase, Mg2Si,particles precipitated within the matrix which was influenced by the extent of cold-work, are responsible for the observed behaviour. The resistance of the alloy also depends on the degree of cold work carried out prior to use.
Review of Green Polymer Nanocomposites  [PDF]
Samson O. Adeosun, G. I. Lawal, Sambo A. Balogun, Emmanuel I. Akpan
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.114028
Abstract: Recently, attention has been drawn to the use of bio-reinforced composites in automotive, construction, packaging and medical applications due to increased concern for environmental sustainability. Green polymer nanocomposites show unique properties of combining the advantages of natural fillers and organic polymers. Plant fibers are found suitable to reinforce polymers. They have relatively high strength and stiffness, low cost of acquisition, low density and produce low CO2 emission. They are also biodegradable and are annually renewable compared to other fibrous materials. Organic polymers on the other hand, are desirable because they are either recyclable or biodegradable without causing environmental hazards. This paper reviews current research efforts, techniques of production, trends, challenges and prospects in the field of green nanocomposites.
Strategic Modeling and Analysis of Internet Connectivity Using Markov Process to Enhance Internet Performance
O.O. Adeosun,E.R. Adagunodo,I.A. Adetunde,T.H. Adeosun
Asian Journal of Information Technology , 2012,
Abstract: Internet system is developed to satisfy a set of requirements that meet a need. A requirement that is important in Internet system is that it should be highly dependable. Fault tolerance is a means of achieving that dependability. This is our main focus in this study. This research presents a framework for optimizing Internet services using fault-tolerant approach. For effective monitoring, we describe an algorithm for accessing files over replicated proxy servers. The realization and actualization of this modeling is through the use of Markovian processes in which time is measured discretely, or counted.
Deterministic Strategy Approach to the Problem of Decision Making
O.O. Adeosun,T.H. Adeosun,I.A. Adetunde
International Journal of Soft Computing , 2012,
Abstract: In this study, an overview of decision making with emphasis on two-person zero-sum game is presented. A deterministic approach, which assumes rational behaviour on part of the players are given. And finally, an overall control structure of a computer solution to solving a two-person zero-sum game is presented.
Strategic Planning for Fault-Tolerant Internet Connectivity Using Basic Fault-Tolerant Architectural Design as Platform
O.O. Adeosun,E.R. Adagunodo,I.A. Adetunde,T.H. Adeosun
Asian Journal of Scientific Research , 2008,
Abstract: Present focus in this study is to provide Internet connectivity without any interruption even at the presence of faults/failures thereby enhancing Internet services performance. To achieve this, the deployment and redeployment of faulty component(s) are done using Basic Fault-Tolerant (BFT) architectural design. A framework to provide enhanced performance in terms of confidentiality, integrity and availability in clusters is suggested using BFT, considering all sources of vulnerabilities including operating system/software, communication hardware, user-level communication and network protocols.
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