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Search Results: 1 - 10 of 32336 matches for " Peter Amoako-Yirenkyi "
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On the Analysis and Numerical Formulation of Miscible Fluid Flow in Porous Media Using Chebyshev Wavelets Collocation Method  [PDF]
Peter Amoako-Yirenkyi, Gaston Edem Awashie, Isaac Kwame Dontwi
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47126
Abstract: In this paper, the Chebyshev wavelet method, constructed from the Chebyshev polynomial of the first kind is proposed to numerically simulate the single-phase flow of fluid in a reservoir. The method was used together with the operational matrices of integration which resulted in an algebraic system of equations. The system of equation was solved for the wavelet coefficient and used to construct the solutions. The efficiency and accuracy of the method were demonstrated through error measurements. Both the root mean square and the maximum absolute error analysis used in the study were within significantly close range. The Chebyshev wavelet collocation method subsequently was observed to closely approximate the analytic solution to the single phase flow model quite well.
Performance Analysis of Image Smoothing Techniques on a New Fractional Convolution Mask for Image Edge Detection  [PDF]
Peter Amoako-Yirenkyi, Justice Kwame Appati, Isaac Kwame Dontwi
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.67048
Abstract: We present the analysis of three independent and most widely used image smoothing techniques on a new fractional based convolution edge detector originally constructed by same authors for image edge analysis. The implementation was done using only Gaussian function as its smoothing function based on predefined assumptions and therefore did not scale well for some types of edges and noise. The experiments conducted on this mask using known images with realistic geometry suggested the need for image smoothing adaptation to obtain a more optimal performance. In this paper, we use the structural similarity index measure and show that the adaptation technique for choosing smoothing function has significant advantages over a single function implementation. The new adaptive fractional based convolution mask can smoothly find edges of various types in detail quite significantly. The method can now trap both local discontinuities in intensity and its derivatives as well as locating Dirac edges.
Spatial Modeling and Mapping of Tuberculosis Using Bayesian Hierarchical Approaches  [PDF]
Abdul-Karim Iddrisu, Yaw Ampem Amoako
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.63043
Abstract: Global spread of infectious disease threatens the well-being of human, domestic, and wildlife health. A proper understanding of global distribution of these diseases is an important part of disease management and policy making. However, data are subject to complexities by heterogeneity across host classes. The use of frequentist methods in biostatistics and epidemiology is common and is therefore extensively utilized in answering varied research questions. In this paper, we applied the hierarchical Bayesian approach to study the spatial distribution of tuberculosis in Kenya. The focus was to identify best fitting model for modeling TB relative risk in Kenya. The Markov Chain Monte Carlo (MCMC) method via WinBUGS and R packages was used for simulations. The Deviance Information Criterion (DIC) proposed by [1] was used for models comparison and selection. Among the models considered, unstructured heterogeneity model perfumes better in terms of modeling and mapping TB RR in Kenya. Variation in TB risk is observed among Kenya counties and clustering among counties with high TB Relative Risk (RR). HIV prevalence is identified as the dominant determinant of TB. We find clustering and heterogeneity of risk among high rate counties. Although the approaches are less than ideal, we hope that our formulations provide a useful stepping stone in the development of spatial methodology for the statistical analysis of risk from TB in Kenya.
Adolescent religiosity and attitudes to HIV and AIDS in Ghana
KN Amoako-Agyeman
SAHARA J (Journal of Social Aspects of HIV/AIDS Research Alliance) , 2012,
Abstract: This study investigated the relationships between adolescent religiosity and attitudes to HIV/AIDS based on two major techniques of analysis, factor and regression analysis towards informing preventive school education strategies. Using cross-sectional data of 448 adolescents in junior high school, the study incorporated survey in a self-administered questionnaire and sought to identify underlying factors that affect pupils’ responses, delineate the pattern of relationships between variables and select models which best explain and predict relationships among variables. A seven-factor solution described the ‘attitude’ construct including abstinence and protection, and six for ‘religiosity’. The results showed relatively high levels of religiosity and a preference for private religiosity as opposed to organisational religiosity. The regression analysis produced significant relationships between factors of attitudes to HIV/AIDS and of religiosity. Adolescent with very high private religiosity are more likely to abstain from sex but less likely to use condoms once they initiate: protection is inversely related to religiosity. The findings suggest that religious-based adolescent interventions should focus on intrinsic religiosity. Additionally, increasing HIV prevention information and incorporating culturally relevant and socially acceptable values might lend support to improved adolescent school-based HIV/AIDS prevention programmes.
Improving Customer Service in the Banking Industry-Case of Ghana Commercial Bank (GCB)-Ghana
George K Amoako
International Business Research , 2012, DOI: 10.5539/ibr.v5n4p134
Abstract: Customer service has become so vital and significant to consider especially in the financial business sector whether locally or globally. As banks continue to provide an increasing number of financial services and products, they face the challenge of integrating these disparate systems into a coherent, efficient infrastructure, while delivering the highest level of customer service and convenience without exposing their customers to the bank’s internal system integration problems. However, banks in Ghana especially Ghana Commercial Bank (GCB) needed to improve and formalize its customer service and public relations programs. A descriptive research method was used to gather data from the respective target population. Customer service at GCB from the customers’ perspective is not satisfactory but has led to the increase in number of new customers, maintenance of existing customer and increase in profitability among others.
A New Generation Microarray for the Simultaneous Detection and Identification of Yersinia pestis and Bacillus anthracis in Food
Noriko Goji,Trevor MacMillan,Kingsley Kwaku Amoako
Journal of Pathogens , 2012, DOI: 10.1155/2012/627036
Abstract: The use of microarrays as a multiple analytic system has generated increased interest and provided a powerful analytical tool for the simultaneous detection of pathogens in a single experiment. A wide array of applications for this technology has been reported. A low density oligonucleotide microarray was generated from the genetic sequences of Y. pestis and B. anthracis and used to fabricate a microarray chip. The new generation chip, consisting of 2,240 spots in 4 quadrants with the capability of stripping/rehybridization, was designated as “Y-PESTIS/B-ANTHRACIS 4x2K Array.” The chip was tested for specificity using DNA from a panel of bacteria that may be potentially present in food. In all, 37 unique Y. pestis-specific and 83 B. anthracis-specific probes were identified. The microarray assay distinguished Y. pestis and B. anthracis from the other bacterial species tested and correctly identified the Y. pestis-specific oligonucleotide probes using DNA extracted from experimentally inoculated milk samples. Using a whole genome amplification method, the assay was able to detect as low as 1?ng genomic DNA as the start sample. The results suggest that oligonucleotide microarray can specifically detect and identify Y. pestis and B. anthracis and may be a potentially useful diagnostic tool for detecting and confirming the organisms in food during a bioterrorism event. 1. Introduction Microarray technology has great potential for use in diagnostics, and DNA microarrays have received considerable attention due to the ability to simultaneously analyse a very large number of nucleic acid sequence targets and detect multiple genetic targets or genomes from multiple pathogens on a single slide [1]. The technology has played an increasingly important role in genomics and has generated increased interest in the last decade. DNA microarrays consist of several oligonucleotide probes that have been immobilized on a solid glass support, and the technique has great potential to be used for the discrimination of closely related strains by employing oligonucleotides specific for each target organism. Hence, the design of a suitable probe set is the key in the development of microarrays as all probes on a microarray should be highly specific for their target genes. The probes should be able to bind efficiently to target sequences to allow the detection of very low abundance targets in complex mixtures with high sensitivity [2]. The use of DNA microarrays has been shown to be effective for the high-throughput detection of pathogenic microorganisms in clinical,
Presentation patterns of primary open angle glaucomas in North eastern Ghana
M Gyasi, W Amoako, M Adjuik
Ghana Medical Journal , 2010,
Abstract: Introduction: Previous reports have indicated that open angle glaucoma is a major problem in the Upper East region of Ghana. Such reports have shown high prevalence among young patients under the age of 40years. None has given enough details on the burden, pattern of distribution and extent of changes in the optic nerve head and intraocular pressures. This study aims at addressing these issues in order to highlight the situation. Methods: Retrospective case series involving review of clinical records of all first-time attendants diagnosed with glaucoma at the Bawku Hospital between October 2003 and December 2005. Case definitions and diagnostic criteria were made to conform as much as possible to the ISGEO and EGS recommendations. Data analysis was done using the Epi-Info software. Results: Records of 891 eyes of 446 patients were reviewed. Median age was 56 years with 23.6% below 40 years. POAG was diagnosed in 98.4% with 8.3% manifesting the NTG variant. One third (34.1%) of all the patients reported bilaterally blind while half were uniocularly blind. Nearly a third (70.2%) had CDRs>0.8 while more than half (54.9%) had CDRs measured at unity. Males were twice as many as females (65.5% and 34.5% respectively) but blindness sequelae among the latter was twice as much and this was statistically significant (p=0.0008;chi2 test) Conclusion: late presentation of open angle glaucoma cases is a major problem in this part of Ghana. We recommend a more aggressive approach to tackle the disease and reduce its blindness sequelae.
An Analysis of the Impact of Strategic Marketing on Profitability of Rural Banks – A Case Study of Dangme Bank
George K. Amoako,Kwasi Dartey-Baah
International Journal of Marketing Studies , 2012, DOI: 10.5539/ijms.v4n2p150
Abstract: The purpose of this study is to examine the factors that influence strategic marketing in relation to profitability in rural banking in Ghana. The research was conducted to see how management and employees follow strategic marketing programmes in delivering superior quality service to their customers and how customers view the service that they receive from the bank. Data was collected from primary and secondary sources. The research revealed that strategic marketing has an effect on the profitability of rural bank services; it revealed that Dangme Rural Bank was marketing oriented and were practicing strategic marketing very well. All employees and the management were conscious of strategic marketing process and activities.
An Unusual Case of Gastric Outlet Obstruction in a Ghanaian Woman  [PDF]
Joachim Amoako, Henry Obaka, Nelson Affram, Wordui Theodore, Faizal Z. Asumda
Case Reports in Clinical Medicine (CRCM) , 2017, DOI: 10.4236/crcm.2017.67020
Abstract: Foreign body ingestion is an uncommon cause of gastric outlet obstruction in adults. Not all ingested objects pass the gastrointestinal tract spontaneously. In most cases, endoscopic removal is required. A surgical approach is required if endoscopic removal is unsuccessful or in the event of a complication. We present a case of a 45-year-old woman, previously diagnosed endoscopically with chronic duodenal ulcer with pyloric stenosis, who presented with copious effortless offensive non-bilious vomiting, and epigastric pain of three weeks’ duration. She was dehydrated with positive gastric succussion splash. Esophago-gastro-duodenoscopy showed an impacted neck-pendant occluding a stenosed pylorus which dislodged on attempts to extract it and was later excreted in the stool, with resolution of her symptoms.
Transient Studies of Ghana Research Reactor-1 after Nineteen (19) Years of Operation Using PARET/ANL Code  [PDF]
Bright Madinka Mweetwa, Emmanuel Ampomah-Amoako, Edward Horga Korbla Akaho
World Journal of Nuclear Science and Technology (WJNST) , 2017, DOI: 10.4236/wjnst.2017.74018
Abstract: The Program for the Analysis of Reactor Transients/Argonne National Laboratory (PARET/ANL) code was used to predict the thermal hydraulic behaviour of the Ghana Research Reactor-1 after adding 9.0 mm of beryllium to the top shim tray of the core. The core was analysed for reactivity insertions 2.1 mk, 3.0 mk, 4.0 mk, 5.0 mk and 6.7 mk, respectively. The reactor is still safe to operate in the range 2.1 mk to 4.0 mk. However, 2.1 mk would be ideal since the reactor automatic shutdown (SCRAM) is set not to exceed 120% of reactor nominal power.
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