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Denoising Letter Images from Scanned Invoices Using Stacked Autoencoders

Computers, Materials & Continua 2022年第4期71卷 1371-1386页

作者： Samah Ibrahim Alshathri desiree juby vincent V.S.Hari Department of Information Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department of Electronics College of Engineering ChengannurKerala Technological UniversityChengannur689121India

Invoice document digitization is crucial for efficient management in *** scanned invoice image is often noisy due to various *** affects the OCR(optical character recognition)detection *** this paper,letter data obtained from images of invoices are denoised using a modified autoencoder based deep learning method.A stacked denoising autoencoder(SDAE)is implemented with two hidden layers each in encoder network and decoder *** order to capture the most salient features of training samples,a undercomplete autoencoder is designed with non-linear encoder and decoder *** autoencoder is regularized for denoising application using a combined loss function which considers both mean square error and binary cross entropy.A dataset consisting of 59,119 letter images,which contains both English alphabets(upper and lower case)and numbers(0 to 9)is prepared from many scanned invoices images and windows true type(.ttf)files,are used for training the neural *** is analyzed in terms of Signal to Noise Ratio(SNR),Peak Signal to Noise Ratio(PSNR),Structural Similarity Index(SSIM)and Universal Image Quality Index(UQI)and compared with other filtering techniques like Nonlocal Means filter,Anisotropic diffusion filter,Gaussian filters and Mean *** performance of proposed SDAE is compared with existing SDAE with single loss function in terms of SNR and PSNR *** show the superior performance of proposed SDAE method.

关键词： Stacked denoising autoencoder(SDAE) optical character recognition(OCR) signal to noise ratio(SNR) universal image quality index(UQ1)and structural similarity index(SSIM)

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Mineralogy and geochemistry of sands of the lower course of the Sanaga River, Cameroon: implications for weathering,provenance, and tectonic setting

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Acta Geochimica 2021年第3期40卷 348-365页

作者： Marie Therese Nanga Bineli vincent Laurent Onana Sylvie desiree Noa Tang Yves Robert Bikoy Georges Emmanuel Ekodeck Department of Earth Sciences Faculty of ScienceUniversity of Yaounde IP.O.Box 812YaoundeCameroon Department of Geology Higher Teacher’s Training CollegeThe University of Yaounde IP.O.Box 47YaoundeCameroon

This study focuses on the mineralogy and bulk chemical composition of 19 sediment samples,collected from the Sanaga River bed,between Nanga-Eboko and the Atlantic Ocean in Cameroon,to infer provenance,weathering,and tectonic *** textural analysis revealed that these sediments are mainly coarse-grained sands.X-ray diffraction and heavy mineral analyses show that these sands are made of quartz,microcline,plagioclase,muscovite,ilmenite,anatase,magnetite,opaques,and *** Index of Chemical Variability values(1.07–2.68)indicates that the sands are *** Chemical Index of Alteration(53–66%),Plagioclase Index of Alteration(PIA;57–75%),and Mafic Index of Alteration(54–67%)values revealed a moderate intensity of weathering for these *** to the compositional maturity diagram,the sands are mainly *** studied sands show enrichment in light rare earth elements relative to heavy rare earth elements and a negative anomaly in Eu(Eu/Eu*=0.32–0.83).These sands were derived from felsic metamorphic rocks dated Meso to Neoproterozoic from the Pan-African(700–1000 Ma)domain of south ***/U ratios(mean=5.40;n=19)reveal that these sands originating from felsic source rocks and are low to moderately *** the tectonic discrimination diagrams,all the samples are plotted in the rift and passive margin domains,which is consistent with the tectonic history of Pan African in southern Cameroon.

关键词： Central Africa Sanaga River sediments Heavy minerals Major and trace elements Source rocks Rift and passive setting

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Influence of Some Physicochemical Exposure Factors on the Metronidazole Content of a Pharmaceutical Product: Flagyl®250 mg Tablet

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Open Journal of Physical Chemistry 2022年第3期12卷 31-45页

作者： Mariette desiree Yehe Frédérique Yah Marie-Pierre Nikiema Linda Hé vincent De Paul Ovi Jean-Kisito Kouame Patrick Grah Atheba Gildas Komenan Gbassi Department of Analytical Sciences and Public Health UFR of Pharmaceutical and Biological Sciences (UFR SPB) Félix Houphou&#235 t Boigny University Abidjan Ivory Coast National Public Health Laboratory Food Control Service Abidjan Ivory Coast Félix Houphouë t Boigny University Laboratory of Analytical Chemistry Bromatology General Chemistry and Inorganic Chemistry Abidjan Ivory Coast

The present work aims to study the influence of some physicochemical parameters (light, temperature, ethanol, bile salts, potassium hydroxide, hydrogen peroxide) on the content of Metronidazole (MTZ) contained in the reference substance (SR) and in a pharmaceutical specialty Flagyl® 250 mg tablet (FLG). The method developed was linear and accurate in accordance with USP 38 and the MTZ contents were obtained by UV-visible spectrophotometry at 278 nm. These contents ranged from 225 mg to 275 mg and were thus consistent with the concentration present in the proprietary medicines (250 mg). The study of the influence of physicochemical parameters on the MTZ content in SR and FLG showed that MTZ contents are unstable in the presence of Ethanol at 96˚, KOH at 0.1N and bile salts but also when the temperature is higher than 25˚C. However, they remain stable in the presence of light and H2O2 and undergo degradation in an acidic environment.

关键词： Metronidazole Influence Physicochemistry Content Stability

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Influence of Some Physico-Chemical Exposure Factors on the Carbocysteine Content of an Opened Pharmaceutical Product

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American Journal of Analytical Chemistry 2022年第12期13卷 495-505页

作者： Jean-Kisito Kouame Mariette desiree Yehe Carine Nina Able vincent De Paul Ovi Hervé Tazoh Broh Claude Bérenger Ngalemo Ngantchouko Gildas Komenan Gbassi National Public Health Laboratory (NPHL) Food Control Service Abidjan Ivory Coast Department of Analytical Sciences and Public Health UFR Pharmaceutical and Biological Sciences Félix Houphou&euml t Boigny University Abidjan Ivory Coast

The aim of this study was to investigate the stability of Carbocysteine (CBC) contained in a reference substance (RS) and in a sample of opened RHINATHIOL® 5% syrup (RNTL 5%) under the effect of some physicochemical parameters (temperature, light, time, pH, bile salts). The developed method was linear, precise and accurate according to USP 38. The co-efficient of determination R2 for linearity was 0.9993. The respective RSD of intra-day and inter-day between days (1st, 2nd and 3rd day) were respectively 0.338% and the interval from 0.05% to 0.387%. The average recovery rate ranged from 98.490% to 100.450%. The detection and quantification limits were 0.0001 mg/mL and 0.001 mg/mL respectively. The method was applied to four samples of opened syrup containing CBC and the CBC content in these samples was found to be in accordance with USP 38. The CBC content in the opened sample of RNTL 5% was obtained by UV-visible spectrophotometry at 217 nm and was 4.887 g/100mL. The study of the influence of physico-chemical factors on the content of CBC in RS and RNTL 5% showed that the evolution of CBC contents in each drug matrix remained dependent on pH and temperature. However, these levels remained stable in the presence of light.

关键词： Influence Physico-Chemistry Content Carbocysteine Stability

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Influence of Some Physicochemical Exposure Factors on the Metronidazole Content of a Pharmaceutical Product: Flagyl® 250 mg Tablet

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Open Journal of Physical Chemistry（物理化学期刊） 2022年第3期

作者： Mariette desiree Yehe Frédérique Yah Marie-Pierre Nikiema LindaHé vincent De Paul Ovi Jean-Kisito Kouame Patrick Grah Atheba Gildas Komenan Gbassi

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Influence of Some Physico-Chemical Exposure Factors on the Carbocysteine Content of an Opened Pharmaceutical Product

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American Journal of Analytical Chemistry（美国分析化学） 2022年第12期

作者： Jean-Kisito Kouame Mariette desiree Yehe Carine Nina Able vincent De Paul Ovi Hervé Tazoh Broh Claude Bérenger Ngalemo Ngantchouko Gildas Komenan Gbassi

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