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Hybrid Successive CFA Image Encryption-Watermarking Algorithm Based on the Quaternionic Wavelet Transform (QWT)

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Journal of Information Security 2022年第4期13卷 244-256页

作者： Hervé abena Ndongo Marcelin Vournone Mireille Pouyap Taya Ngakawa paul abena malobe Energy Signal Imaging and Automatic Laboratory (LESIA) Department of Electrical and Industrial Automatic Engineering National School of Agro-Industrial Sciences (ENSAI) University of Ngaoundere Ngaoundere Cameroon Mapping Production Division Department of Data Collection National Institute of Cartography Yaounde Cameroon Department of Physics Higher Teacher Training College University of Maroua Maroua Cameroon Department of Physics Faculty of Science (FS) University of Ngaoundere Ngaoundere Cameroon

In this paper, we present a new robust hybrid algorithm combining successively chaotic encryption and blind watermarking of images based on the quaternionic wavelet transform (QWT) to ensure the secure transfer of digital data. The calculations of the different evaluation parameters have been performed in order to determine the robustness of our algorithm to certain attacks. The application of this hybrid algorithm on CFA (Color Filter Array) images, allowed us to guarantee the integrity of the digital data and to propose an autonomous transmission system. The results obtained after simulation of this successive hybrid algorithm of chaotic encryption and then blind watermarking are appreciated through the values of the evaluation parameters which are the peak signal-to-noise ratio (PSNR) and the correlation coefficient (CC), and by the visual observation of the extracted watermarks before and after attacks. The values of these parameters show that this successive hybrid algorithm is robust against some conventional attacks.

关键词： Encryption Blind Watermarking Chaos CFA Images QWT

Biological Profile and Cardiovascular Risk in Patients Receiving Neuroleptics at the Psychiatric Department of the University Hospital Center of Brazzaville

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Journal of Biosciences and Medicines 2024年第6期12卷 33-42页

作者： Landry Martial Miguel paul Gandou Justecidi Kiang Choupette Ravelle Dobhat-Doukakini Didier Gesril Njilo Tchatchouang Childerick Lekana Destin Mbemba Bahamboula Archange Emmanuel Mboungou Malonga Donatien Moukassa Alain Maxime Mouanga Ange Antoine abena Biochemical and Pharmacology Laboratory Faculty of Health Sciences Marien Ngouabi University Brazzaville Republic of Congo Psychiatric Department University Hospital Center Brazzaville Republic of Congo Department of Biological Sciences Dnis Sassou-NGuesso University Kintl Republic of Congo

Several studies report the problem of cardiovascular tolerance of treatments with neuroleptics, given the important number of morbidities in patients with mental illnesses. This preliminary work aimed to describe the epidemiological and biological profile of patients taking neuroleptics and followed in the psychiatry department of Brazzaville University Hospital, from the angle of cardiovascular risk. Fifty (50) patients (17 men and 33 women), with a mean age of 33.9 10.7 years, were included. Epidemiological data (sex, age, tobacco or alcohol consumption) were collected on pre-established survey forms. Biochemical (total cholesterol, HDL-c, triglycerides and atherogenicity index) and inflammatory parameters (ultra-sensitive CRP, troponin I and NT-ProBNP) were investigated using enzymatic and indirect immunofluorescence technical, respectively. The results obtained showed that 54% of patients were obese, 94% were non-smokers, and 12% had high blood pressure. 10% of patients had high total cholesterol levels and 90% had HDL cholesterol levels below 60 mg/dl. Triglycerides and atherogenicity index were significantly elevated in relation to Body Mass Index (BMI). Ultrasensitive CRP was elevated in 38% of patients. In conclusion, this study revealed an association between lipid parameters (triglycerides and atherogenicity index) in relation to BMI in patients taking neuroleptics followed in the Psychiatry Department of University Hospital Center of Brazzaville.

关键词： Neuroleptic Cardiovascular Risk Psychiatry Brazzaville

Generation of Hyperchaos from the LüSystem with a Sinusoidal Perturbation

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Journal of Applied Mathematics and Physics 2021年第5期9卷 1100-1107页

作者： Philippe Djondiné paul abena Malobé Department of Physics Higher Teacher Training College The University of Ngaoundéré Bertoua Cameroon Department of Physics Faculty of Sciences The University of Ngaoundéré Ngaoundéré Cameroon

This paper introduces a hyperchaotic system from the Lü system with a sinusoïdal perturbation. This hyperchaotic system has more complex dynamical behaviors, and can generate 2-scroll hyperchaotic attractor and 2-scroll chaotic attractor under different control parameters. Theoretical analyses and simulation are conducted to investigate the dynamical behaviors of the proposed hyperchaotic system by means of Lyapunov exponents, analysis of the bifurcation diagram and phase portraits.

关键词： Hyper-Chaotic Bifurcation Lü System Lyapunov Exponent

Radio-Medicine and Public Health in Rural Ghana

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Journal of Biosciences and Medicines 2022年第4期10卷 181-192页

作者： abena Ansomaa Debrah Wiafe Clement Tetteh Narh Florence Kuukyi paul Adjei Kwakwa Department of Physician Assistantship Faculty of Medical Sciences Presbyterian University College Ghana Agogo Ghana Department of Epidemiology and Biostatistics School of Public Health University of Health and Allied Sciences Hohoe Ghana Accra Metropolitan Assembly Accra Ghana University of Energy and Natural Resources Sunyani Ghana

Radio is know-how that comes with low manufacturing costs, and low infrastructure costs and its marginal cost of distribution is very low which is close to zero. This study was conducted to examine the rate at which radios advertise medical services and products;the factors that promote the patronage of radio-medicine and evaluate the effects of radio-medicine on people who patronize it. The study took place at Agogo by interviewing 50 people belonging to 10 different professional groups as follows: Farmers, Drivers, shopkeepers, tailors/seamstresses, teachers, hairdressers, barbers, market women, students and the unemployed. Through SPSS, the data was analyzed and the result indicated that 44.0% listen to radio once a day, 14.0% listen every hour, and 42.0% listen all day. On the reasons for patronizing radio-medicine, 24% bought per testimonies shared from others, 12% said it is easy to patronize, 12.0% do that for affordability and effectiveness, 8.0% said it is good, 4.0% were highly convinced by suppliers, 4.0% patronized because there are no side effects, 12.0% were for just trials, 10.0% said there is no time to go to the hospital, 8.0% did so because they had minor conditions and 6.0% patronized for first aid and relieve of symptoms. In addition, 68.0% agreed that the medicine worked for them as expected but 32.0% agreed that the medicine did not work as expected. It was concluded that most people listen to radio all day and most of them participate, in medicines advertised on the radio, because of testimonies shared by others. Even-though majority of the respondents thought they could be affected they did not care about it. Recommendations have been made to the Ministry of Health to regulate radio-medicine and its patronage and also for further research by research institutions.

关键词： Radio Medicine Public Health Rural Advertisement

Thermal and Physicochemical Characterization of Fibers from Coffee Hulls as Filler for Linear Low Density Polyethylene (LLDPE)

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Advances in Materials Physics and Chemistry 2021年第10期11卷 155-166页

作者： Ahmat Tom Abel Tame paul Nestor Djomou Djonga Bakary Tigana Djonse Justin Eugenie Géraldine Nga abena Department of Energy Engineering University Institute of Technology University of Ngaoundere Ngaoundere Cameroon Department of Chemistry Faculty of Science University of Yaoundé I Yaoundé Cameroon Department of Textile and Leather Engineering National Advanced School of Engineering of Maroua Maroua Cameroon Department of Chemistry Faculty of Science University of Maroua Maroua Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

This work presents the thermal, physical and chemical characterization of Coffee canephora, from littoral region of Cameroon, for their use as reinforcement for polymeric materials. The infrared of coffee hulls shows the presence of a large peak intensity at 3299 cm-1 that can be attributed to O-H stretching group of alcohol (cellulose content in coffee pulp). The intensity 2926 cm-1 can be attributed to C-H stretching group of alkanes or the vibration of methoxy group of lignin. Thermo gravimetric analysis shows that around 440°C, the biomass has been completely consumed;the temperature profiles show a peak at 86°C that could correspond to the loss of water as evaporation at a percentage of 8%;the peak at 321°C is accompanied by a water loss of 64.50%; this temperature is assimilated to the degradation of hemicelluloses;the temperature range from 321°C to 401°C is accompanied by a loss of mass of 22.80%, which would be due to the degradation of cellulose. SEM images of the surface of raw coffee hulls, coffee hulls treated with caustic soda respectively clearly reveal gaps between the fibers. The results showed that the incorporation of coffee hulls fiber in LLDPE matrix might result in composites with suitable property application for various industrial fields

关键词： Characterization Coffee Hulls Filler LLDPE Physicochemical and Thermal

Low Density Linear Polyethylene Reinforced with Alkali and MAPE Treated Fibers from Coffee Pulp

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Open Journal of Composite Materials 2021年第4期11卷 94-110页

In this work fibers derived from coffee, hulls have been incorporated into Linear Low Density Polyethylene (LLDPE). The influence of the filler content on the thermal and physicomechanical properties of the composites obtained was assessed. The results showed that the incorporation of fibers was able to improve the thermostability of LLDPE/Coffee hulls fibers;comparing the treated fiber composite with untreated fiber composites, the chemical treatment reduces by 58.3% the water absorption, while increasing the elongation and tensile strength by about 48% and 17% respectively. Moreover, due to better interfacial interaction induced by MAPE, the corresponding composite exhibited better properties compared to the untreated fiber composite. Results are indicative of the fact that both mercerization and MAPE (coupling agent) have significant positive effects on the fiber-matrix interaction in terms of adhesion, wetting and dispersion, this treatment produced a better fiber distribution and consequently a more uniform composite morphology without voids and gaps between the fibers and the matrix, allowing the possibility to use higher fiber contents (up to 30% wt.) with acceptable mechanical properties.

关键词： Fiber from Coffee Fiber Hull Linear Low Density Polyethylene Composite MAPE

Mental health and quality of life burden in Buruli ulcer disease patients in Ghana

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Infectious Diseases of Poverty 2021年第4期10卷 93-94页

作者： Yaw Ampem Amoako Nancy Ackam John-paul Omuojine Michael Ntiamoah Oppong abena Gyawu Owusu-Ansah Harriet Boateng Mohammed Kabiru Abass George Amofa Elizabeth Ofori Portia Boakye Okyere Michael Frimpong Freddie Bailey David Hurst Molyneux Richard Odame Phillips Kumasi Centre for Collaborative Research in Tropical Medicine Kwame Nkrumah University of Science and TechnologyKumasiGhana 不详

Background Buruli ulcer disease(BUD)is a necrotic skin neglected tropical disease(NTD)that has both a mental and physical health impact on affected *** there is increasing evidence suggesting a strong association between neglected tropical diseases(NTDs)and mental illness,there is a relative lack of information on BUD’s impact on the mental health and quality of life(QoL)of affected individuals in *** study is to assess the impact of BUD on mental health and quality of life of patients with active and past BUD infection,and their *** We conducted a case control study in 3 BUD endemic districts in Ghana between August and November ***-to-face structured questionnaire-based interviews were conducted on BUD patients with active and past infection,as well as caregivers of BUD patients using WHO Quality of Life scale,WHO Disability Assessment Schedule,Self-Reporting Questionnaire,Buruli Ulcer Functional Limitation Score and Hospital Anxiety and Depression Scale data *** statistics were used to summarize the characteristics of the study *** groups were compared using student t test and chi-square(χ2)or Fisher’s exact *** quality of life scores are reported with their respective 95%confidence *** was analysed using STATA statistical *** Our results show that BUD patients with active and past infection,along with their caregivers,face significant levels of distress and mental health sequelae compared to ***(P=0.003)was more common in participants with active(27%)and past BU infection(17%),compared to controls(0%).Anxiety was found in 42%(11/26)and 20%(6/29)of participants with active and past BUD infection compared to 14%(5/36)of *** of life was also significantly diminished in active BUD infection,compared to *** the physical health domain,mean QoL scores were 54±11.1 and 56±11.0(95%CI:49.5‒58.5 and 52.2‒59.7)respectively for p

关键词： Mental health Depression Anxiety Quality of life Buruli ulcer disease Neglected tropical disease