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Search Results: 1 - 10 of 461761 matches for " A. Agyemang "
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Experimental Evaluation of the Attenuation Effect of a Passive Damper on a Road Vehicle Bumper  [PDF]
A. Agyei-Agyemang, G. Y. Obeng, P. Y. Andoh
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23021
Abstract: To mitigate the degree of damage to passengers caused by automobile collisions, a friction damper was built and used in experimental tests to test its effectiveness in impact energy attenuation. The study revealed that energy absorption capacity of a bumper can be improved with the addition of a friction damper. The results revealed that the addition of the friction damper to an automobile bumper to give a bumper-damper system could attenuate about 32.5 % more energy than with the bumper alone. It can be concluded that the effectiveness of automobile bumpers to withstand impact of vehicles by absorbing the kinetic energy from the impact can be improved with the use of a passive friction damper. That is, a passive friction damper system could be used to attenuate more road vehicle impact energy in collisions.
Optimisation of Plate Thickness Using Finite Difference Method
A Agyei-Agyemang, P Akangah
Journal of Science and Technology (Ghana) , 2008,
Abstract: A finite difference numerical method of solving biharmonic equation is presented. The biharmonic equation and plate theory are used to solve a classical engineering problem involving the optimisation of plate thickness to minimise deformations and stresses in the plate. Matlab routines were developed to solve the resulting finite difference equations. The results from the finite difference method were compared with results obtained using ANSYS finite element formulation. Using the finite difference method, a plate thickness of 277 mm was obtained with a mesh size of 3 m and a plate thickness of 271 mm was obtained with a mesh size of 1 m., whiles using ANSYS finite element formulation, a plate thickness of 270 mm was obtained. The significance of these results is that, by using off-the-shelf general application tool and without resorting to expensive dedicated application tool, simple engineering problems could be solved.
Testosterone and Its Bioactive Components Are Associated with Libido and the Metabolic Syndrome in Men  [PDF]
H. Alidu, N. Amidu, W. K. B. A. Owiredu, C. K. Gyasi-Sarpong, A. T. Bawah, P. P. M. Dapare, E. B. Agyemang Prempeh
Advances in Sexual Medicine (ASM) , 2017, DOI: 10.4236/asm.2017.72008
Abstract: Background: Some evidence has shown that the prevalence of hypoactive sexual desire and erectile dysfunction (ED) is associated with testosterone levels whilst higher levels of testosterone have been reported to increase the frequency of intercourse. Available evidence points towards an etiologic role for hypogonadism in the causation of diabetes, metabolic syndrome (Mets) and sexual dysfunction (SD) even though the exact pathophysiological linkage is yet to be fully elucidated. This study therefore sought to evaluate the impact of testosterone as well as its bioactive components on both the MetS and SD. Method: Diabetic men engaged in a stable heterosexual relationship for at least 2 years were recruited for this study. Participants were at least 18 years and provided an informed and signed consent to partake in this study. Fasting blood samples were taken from the participants for biochemical and hormonal assay. The participants were then evaluated using the Golombok Rust Inventory of Sexual Satisfaction for males (GRISS-M). Metabolic syndrome was assessed using the NCEP-ATP III, IDF and WHO criteria. All data analyses were performed using the SPSS software, version 11.0 systat, Inc. Germany and GraphPad Prism, version 5.0, San Diego California, USA. Results: The mean total, free and bioavailable testosterone as well as SHBG recorded among the participants was 7.10 ± 1.23 ng/ml, 0.10 ± 0.01 ng/ml, 7.01 ± 1.41 ng/ml and 4.33 ± 1.12 nmol/l respectively. Subjects with the MetS showed significantly lower SHBG levels in comparison with subjects without the MetS. Participants with raised triglyceride levels showed significantly lower levels of total, free and bioavailable testosterone when compared to participant without raised triglycerides. Participants with problems of avoidance and infrequency of sexual activity showed significantly lower levels of total, free and bioavailable testosterone when compared to participants without avoidance or infrequency problems. The +SD/+MetS group recorded the lowest SHBG levels. Conclusion: Testosterone and its bioactive components are associated with male libido as well as the metabolic syndrome. Low levels of free and bioavailable testosterone are true determinants of the MetS in men.
Alcohol Consumption Is Associated with Hypogonadism and Decreased Sexual Function in Ghanaian Diabetics  [PDF]
Huseini Alidu, William K. B. A. Owiredu, Nafiu Amidu, Christian Kofi Gyasi-Sarpong, Peter Paul Mwinsanga Dapare, Ahmed Tijani Bawah, Arnold Togiwe Luuse, Emmanuel Barima Agyemang Prempeh
Advances in Sexual Medicine (ASM) , 2017, DOI: 10.4236/asm.2017.73009
Abstract: Introduction: Alcohol usage has largely been seen as a risk factor for the development of sexual dysfunction as well as erectile dysfunction. Others have reported that prolonged alcohol usage and abuse is compatible with normal sexual function in the absence of endocrinological problems as well as hepatic dysfunction. About seventy five (75) percent of alcoholics have various sexual difficulties with improvements in sexual functions occurring after treatment of alcoholism and psychosexual therapy. It is evident from the various reports over the years that mild and occasional alcohol usage is not as much implicated in the causation of SD and its other forms as heavy, addictive or dependent alcohol usage. Alcohol usage has also long been linked to hypogonadism, testicular atrophy as well as leydig cell toxicity. Alcohol induced hypogonadism has been reported to resolve after withdrawal of alcohol use. Since both diabetes and alcohol usage have been strongly associated with both hypogonadism and sexual dysfunction, it is logical to expect that diabetics who frequently consume alcohol will have a worsened hypogonadal state and sexual function. This research therefore seeks to provide evidence of an association between alcohol consumption in diabetics and a worsened sexual dysfunction in comparison to diabetics who did not consume alcohol. Methods: Type II diabetic patients attending the Diabetic Clinic at the Maamobi General Hospital between the periods of January 2010 and March 2011 were consecutively recruited for this study. Diabetics with other known endocrinological diseases and physical disabilities were excluded from the study. Sexual function was assessed using the GRISS-M. Early morning fasting samples were used in lipid and testosterone profile assays. Results: Study participants who consumed alcohol recorded higher levels of triglycerides and LDL-Cholesterol. They also recorded significantly lower levels of bioavailable testosterone. Furthermore they also recorded higher scores for impotence, premature ejaculation, non-sensuality and infrequency but lower scores for avoidance and were about six times more likely to be infrequent in their sexual activity in comparison with those who did not consume alcohol. Conclusion: Alcohol consumption among diabetic males is associated with hypogonadism and has an impact on several domains of male sexual function. Diabetic males should be advised to avoid alcohol abuse in order to facilitate the management of diabetes associated sexual
Optimized Homomorphic Scheme on Map Reduce for Data Privacy Preserving  [PDF]
Konan Martin, Wenyong Wang, Brighter Agyemang
Journal of Information Security (JIS) , 2017, DOI: 10.4236/jis.2017.83017
Abstract: Security insurance is a paramount cloud services issue in the most recent decade. Therefore, Mapreduce which is a programming framework for preparing and creating huge data collections should be optimized and securely implemented. But, conventional operations on ciphertexts were not relevant. So there is a foremost need to enable particular sorts of calculations to be done on encrypted data and additionally optimize data processing at the Map stage. Thereby schemes like (DGHV) and (Gen 10) are presented to address data privacy issue. However private encryption key (DGHV) or key’s parameters (Gen 10) are sent to untrusted cloud server which compromise the information security insurance. Therefore, in this paper we propose an optimized homomorphic scheme (Op_FHE_SHCR) which speed up ciphertext (Rc) retrieval and addresses metadata dynamics and authentication through our secure Anonymiser agent. Additionally for the efficiency of our proposed scheme regarding computation cost and security investigation, we utilize a scalar homomorphic approach instead of applying a blinding probabilistic and polynomial-time calculation which is computationally expensive. Doing as such, we apply an optimized ternary search tries (TST) algorithm in our metadata repository which utilizes Merkle hash tree structure to manage metadata authentication and dynamics.
GUI Database for the Equipment Store of the Department of Geomatic Engineering, KNUST
J. A. Quaye-Ballard,R. An,A. B. Agyemang,N. Y. Oppong-Quayson
International Journal of Advanced Computer Sciences and Applications , 2012,
Abstract: The geospatial analyst is required to apply art, science, and technology to measure relative positions of natural and man-made features above or beneath the earth’s surface, and to present this information either graphically or numerically. The reference positions for these measurements need to be well archived and managed to effectively sustain the activities in the spatial industry. The research herein described highlights the need for an information system for the Land Surveyor’s Equipment Store. Such a system is a database management system with a user-friendly graphical interface. This paper describes one such system that has been developed for the Equipment Store of the Department of Geomatic Engineering, Kwame Nkrumah University of Science and Technology (KNUST), Ghana. The system facilitates efficient management and location of instruments, as well as easy location of beacons together with their attribute information; it provides multimedia information about instruments in an Equipment Store. Digital camera was used capture the pictorial descriptions of the beacons. A Geographic Information System (GIS) software was employed to visualize the spatial location of beacons and to publish the various layers for the Graphical User Interface (GUI). The aesthetics of the interface was developed with user interface design tools and coded by programming. The developed Suite, powered by a reliable and fully scalable database, provides an efficient way of booking and analyzing transactions in an Equipment Store.
Antimicrobial and uterine smooth muscle activities of Albizia ferruginea extracts
C. Agyare,G. A. Koffuor,A.Y. Mensah,D. O. Agyemang
Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas , 2006,
Abstract: Actividad antimicrobiana, actividad musculatura lisa uterina, Albizia ferruginea, extracto de hojas, extracto de corteza del tallo
Blood pressure patterns in rural, semi-urban and urban children in the Ashanti region of Ghana, West Africa
Charles Agyemang, William K Redekop, Ellis Owusu-Dabo, Marc A Bruijnzeels
BMC Public Health , 2005, DOI: 10.1186/1471-2458-5-114
Abstract: We conducted a cross-sectional survey among school children aged 8–16 years in the Ashanti region of Ghana (West-Africa). There were 1277 children in the study (616 boys and 661 females). Of these 214 were from rural, 296 from semi-urban and 767 from urban settings.Blood pressure increased with increasing age in rural, semi-urban and urban areas, and in both boys and girls. The rural boys had a lower systolic and diastolic blood pressure than semi-urban boys (104.7/62.3 vs. 109.2/66.5; p < 0.001) and lower systolic blood pressure than urban boys (104.7 vs. 107.6; p < 0.01). Girls had a higher blood pressure than boys (109.1/66.7 vs. 107.5/63.8; p < 0.01). With the exception of a lower diastolic blood pressure amongst rural girls, no differences were found between rural girls (107.4/64.4) and semi-urban girls (108.0/66.1) and urban girls (109.8/67.5). In multiple linear regression analysis, locality and BMI were independently associated with blood pressure in both boys and girls.These findings underscore the urgent need for public health measures to prevent increasing blood pressure and its sequelae from becoming another public health burden. More work on blood pressure in children in sub-Saharan African and other developing countries is needed to prevent high blood pressure from becoming a major burden in many of these countries.High blood pressure has been identified as one of the leading causes of cardiovascular disease and premature mortality in the world [1]. In traditional African societies, high blood pressure, once rare, [2] is rapidly becoming a major public health burden [3-6]. The recent data show prevalence rates as high as 33% in some communities [3,4]. The increasing prevalence of hypertension is well reflected in the increasing stroke and cardiovascular disease morbidity and mortality [7-9].In children, blood pressure tracking patterns confirm that persistent blood pressure elevation may be related to hypertension in adulthood [10,11]. The emerging dat
A cluster-randomized controlled trial evaluating the effect of culturally-appropriate hypertension education among Afro-Surinamese and Ghanaian patients in Dutch general practice: study protocol
Joke A Haafkens, Erik JAJ Beune, Eric van Charante, Charles O Agyemang
BMC Health Services Research , 2009, DOI: 10.1186/1472-6963-9-193
Abstract: A cluster-randomized controlled trial will be conducted in four primary care practices in Amsterdam, all offering hypertension care according to Dutch clinical guidelines. After randomization, patients in the usual care sites (n = 2) will receive standard hypertension education. Patients in the intervention sites (n = 2) will receive three culturally-appropriate hypertension education sessions, culturally-specific educational materials and targeted lifestyle support. The primary outcome will be the proportion of patients with a reduction in systolic blood pressure ≥ 10 mmHg at eight months after the start of the trial. The secondary outcomes will be the proportion of patients with self-reported adherence to (i) medication and (ii) lifestyle recommendations at eight months after the start of the trial. The study will enrol 148 patients (74 per condition, 37 per site). Eligibility criteria for patients of either sex will be: current diagnosis of hypertension, self-identified Afro-Surinamese or Ghanaian, ≥ 20 years, and baseline blood pressure ≥ 140/90 mmHg. Primary and secondary outcomes will be measured at baseline and at 3 1/2, 6 1/2, and eight months. Other measurements will be performed at baseline and eight months.The findings will provide new knowledge on how to improve blood pressure control and patient adherence in ethnic minority persons with a high risk of negative hypertension-related health outcomes.ISRCTN35675524Hypertension (HTN) is a major risk factor for cardiovascular morbidity and mortality [1]. In western countries, ethnic minority populations of African descent are disproportionately affected by HTN and HTN-related cardiovascular morbidity and mortality [2-4]. This has also been observed among two major immigrant groups of African descent in the Netherlands: African-Surinamese from the former Dutch colony of Suriname (hereafter referred to as Surinamese) [5], and Ghanaians [6,7]. Poor adherence to prescribed medication and lifestyle changes such as
Yield Evaluation of Three Early Maturing Bambara Groundnut (Vigna subterranea L. Verdc) Landraces at the CSIR-Crops Research Institute, Fumesua-Kumasi, Ghana
J.N. Berchie,J. Sarkodie-Addo,H. Adu-Dapaah,A. Agyemang
Journal of Agronomy , 2010,
Abstract: The aim of this study was to determine the field performance of three early maturing bambara groundnut landraces which were identified in a controlled environment study by the lead author at the University of Guelph, Guelph-Ontario, Canada between October 2008 and March, 2009. Bambara groundnut is an indigenous African grain legume which is cultivated for food especially in the dry areas with short and erratic rainfall. Three bambara groundnut landraces; Burkina, Zebra coloured and Mottled Cream were evaluated for yield at the CSIR-Crops Research Institute, Kumasi-Ghana. The trial was sown on the 1st of April, 2009. The experiment was arranged in a Randomized Complete Block Design with three replications. Plants were sown at a spacing of 50 by 20 cm at two seeds per hill and thinned to one seedling per hill at 20 DAS. Zebra coloured took the least number of days to mature (89.5 days) followed by Mottled Cream (98.2 days) and Burkina (112.5 days). Zebra coloured produced the greatest pod yield per plant (23.6 g) followed by Burkina (17.7 g) and Mottled Cream (12.5 g). The base colour of the three landraces which is cream has been identified to be the preference of bambara groundnut growers and consumers. In areas with erratic rainfall and the lower latitudes where long daylength can negatively affect bambara groundnut yields, these early maturing landraces have the potential to reduce variation in bambara groundnut yields.
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