Towards On-device Deep Neural Network Inference and Model Update for Real-time Gesture Classification

Mustapha Deji Dere,Jo Ji-hun,Boreom Lee 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11

Deep learning resurgence ushered in the application of pattern recognition algorithms in high-impact research fields with impressive accuracy. In addition, deep neural networks (DNN) have recently been used to classify gestures for rehabilitation device control utilizing raw electromyography data. However, the computational resources required by a convolution neural network (CNN) are a constraint that often limits deployment to embedded devices for real-time inference. An optimized edge adaptive convolutional neural network using a short-time Fourier transform (STFT) spectrogram input was proposed in this study. The models classification accuracy was evaluated offline and on-device for inter-subject accuracy. Furthermore, an adaptive weight update approach was implemented to improve inference model accuracy due to degradation. The proposed model and optimization technique achieved offline accuracy of 92.19 % and 94.29 % for the raw and STFT input, respectively. However, the on-device accuracy for raw and STFT input to the model was 82.26 % and 85.19 %, respectively. On the other hand, the adaptive model update increased the respective accuracy by an average of 7% on-device. Finally, our study demonstrates the deployment of DNN on-device for real-time gesture classification inference.

A new higher order shear and normal deformation theory for functionally graded beams

Mustapha Meradjah,Abdelouahed Tounsi,Abdelhakim Kaci,Mohammed Sid Ahmed Houari,S. R. Mahmoud 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.3

In this scientific work, constructing of a novel shear deformation beam model including the stretching effect is of concern for flexural and free vibration responses of functionally graded beams. The particularity of this model is that, in addition to considering the transverse shear deformation and the stretching effect, the zero transverse shear stress condition on the beam surface is assured without introducing the shear correction parameter. By employing the Hamilton's principle together with the concept of the neutral axe's position for such beams, the equations of motion are obtained. Some examples are performed to demonstrate the effects of changing gradients, thickness stretching, and thickness to length ratios on the bending and vibration of functionally graded beams.

Ethanol extract of aloe vera ameliorates Artemether-Lumefantrine-induced reproductive toxicity in adult male Albino rats (Wistar Strain)

Mustapha Olamide Oluwayemisi,Fatola Olanrewaju,Ola-Davies Olufunke,Ajayi Olusola Lawrence,Oyeyemi Matthew 환경독성보건학회 2023 환경독성보건학회지 Vol.38 No.4

Artemether-Lumefantrine (AL) is one of the alternative drugs used in treating malaria – an endemic scourge in Africa. AL has been reported to generate free radicals with long term use implicated in testicular pathologies. The antioxidative properties of Aloe vera (AV) has been well documented. This study investigated the ameliorative effect of ethanol extract of Aloe Vera on Artemether-Lumefantrine induced testicular toxicity. Thirty adult male albino rats were randomly divided into 5 groups (Control, AL-dosed, AV-dosed, AL+AV concurrently administered and AV-pretreated). Spermiogram, serum testosterone, testicular histopathology and inducible nitric oxide synthase (iNOS) immunohistochemistry were carried out. AL-dosed rats had poor spermiogram indices which were greatly improved in AV-dosed and AV-pretreated rats. These also corresponded with the testicular histopathology observations and were further buttressed by oxidative stress marker (iNOS) as AL-dosed rats had higher signal intensity compared to the control and AV-pretreated rats. Authors posit that concurrent administration of AV and AL protected testicular architecture while pretreating with AV prior AL administration improved the spermiogram. AL induces testicular pathology, thus should be used with care in male subjects. AV can confer a level of protection against these defects if used prior to administration of the drug.

STUDY OF A CRITICAL Φ-KIRCHHOFF TYPE EQUATIONS IN ORLICZ-SOBOLEV SPACES

Mustapha Haddaoui,Najib Tsouli,Ayoub Zaki 경남대학교 수학교육과 2022 Nonlinear Functional Analysis and Applications Vol.27 No.3

This paper is concerned with the existence of solutions for a class of Φ-Kirchhoff type equations with critical exponent in Orlicz-Sobolev spaces. Our technical approach is based on variational methods.

Futurs africains, postcolonialisme et mythe du developpement

( Mustapha Machrafi ) 서울대학교 불어문화권연구소 2012 Revue dEtudes Francophones Vol.1 No.-

Assessment and Correlation of Saline Soil Characteristics using Electrical Resistivity

Mustapha Maliki,Fatima Zohra Hadjadj,Nadia Laredj,Hanifi Missoum The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.3

Soil salinity is becoming one of the most devastating environmental hazards over the years. Soil investigation involves fast, low cost and non disturbing methods to measure soil characteristics for both construction projects as well as for agricultural use. The electrical resistivity of saline soils is greatly governed by salt concentration and the presence of moisture in soil matrix. Experimental results of this investigation highlight that there is a significant relationship between the electrical resistivity of soil samples mixed with chloride solutions (NaCl, KCl, and MgCl₂) at various concentrations, and soil physical properties. Correlations represented by quadratic functions were obtained between electrical resistivity and soil characteristics, namely, water content, degree of saturation and salt concentration. This research reveals that the obtained correlations between electrical resistivity, salt concentration, water content and degree of saturation are effective for predicting the characteristics of salt affected soils in practice, which constitute a governing element in the assessment of saline lands sustaining infrastructure.

Optimization and characterization of biodiesel produced from vegetable oil

Mustapha, Amina T.,Abdulkareem, Saka A.,Jimoh, Abdulfatai,Agbajelola, David O.,Okafor, Joseph O. Techno-Press 2013 Advances in energy research Vol.1 No.2

The world faces several issues of energy crisis and environmental deterioration due to over-dependence on single source of which is fossil fuel. Though, fuel is needed as ingredients for industrial development and growth of any country, however the fossil fuel which is a major source of energy for this purpose has always been terrifying thus the need for alternative and renewable energy sources. The search for alternative energy sources resulted into the acceptance of a biofuel as a reliable alternative energy source. This work presents the study of optimization of process of transesterification of vegetable oil to biodiesel using NaOH as catalyst. A $2^4$ factorial design method was employed to investigate the influence of ratio of oil to methanol, temperature, NaOH concentration, and transesterification time on the yield of biodiesel from vegetable oil. Low and high levels of the key factors considered were 4:1 and 6:1 mole ratio, 30 and $60^{\circ}C$ temperatures, 0.5 and 1.0 wt% catalyst concentration, and 30 and 60 min reaction time. Results obtained revealed that oil to methanol molar ratio of 6:1, tranesetrification temperature of $60^{\circ}C$, catalyst concentration of 1.0wt % and reaction time of 30 min are the best operating conditions for the optimum yield of biofuel from vegetable oil, with optimum yield of 95.8%. Results obtained on the characterizzation of the produced biodiesel indicate that the specific gravity, cloud point, flash point, sulphur content, viscosity, diesel index, centane number, acid value, free glycerine, total glycerine and total recovery are 0.8899, 4, 13, 0.0087%, 4.83, 25, 54.6. 0.228mgKOH/g, 0.018, 0.23% and 96% respectively. Results also indicate that the qualities of the biodiesel tested for are in conformity with the set standard. A model equation was developed based on the results obtained using a statistical tool. Analysis of variance (ANOVA) of data shows that mole ratio of ground nut oil to methanol and transesterification time have the most pronounced effect on the biodiesel yield with contributions of 55.06% and 9.22% respectively. It can be inferred from the results various conducted that vegetable oil locally produced from groundnut oil can be utilized as a feedstock for biodiesel production.

Design and Study of a Micro Solar Converter Connected to an Autonomous Photovoltaic System

Mustapha Belhabib,Azzedine Hamid,Abderrahim Mokhefi,Vincent Bley,Tahar Alili,Fatima Zohra Medjaoui 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.5

In this study we presented the design and modeling of a DC–DC two boost micro-converter in parallel, containing two micro-coils identical planar circular spiral, which is part of a stand-alone photovoltaic system. This micro-converter is controlled by an MPPT command (incrementing conductance) which will ensure that the maximum power supplied by the photovoltaic module is maintained. This design required an in-depth study of each component of the photovoltaic system: The photovoltaic module, the micro-converter, the micro-coils and the MPPT control.

Dynamics of Hexavalent Chromium in Four Types of Aquaculture Ponds and Its Effects on the Morphology and Behavior of Cultured Clarias gariepinus (Burchell 1822)

Mustapha, Moshood Keke Korean Society of ToxicologyKorea Environmental Mu 2017 Toxicological Research Vol.33 No.2

Hexavalent chromium is a bio accumulative toxic metal in water and fish. It enters aquaculture ponds mainly through anthropogenic sources. Hexavalent chromium concentrations and its effects on the morphology and behavior of Clarias gariepinus were investigated from four aquaculture ponds for 12 weeks. Chromium was measured using diphenyl carbohdrazide method; alkalinity and hardness were measured using colometric method and analyzed with Bench Photometer. Temperature and pH were measured using pH/EC/TDS/Temp combined tester. Temporal and spatial replications of samples were done with triplicates morphological and behavioural effects of the metal on fish were observed visually. Chromium ranged from no detection to 0.05 mg/L, alkalinity 105 to 245 mg/L, hardness 80 to 165 mg/L, pH 6.35 to 8.03 and temperature 29.1 to $35.9^{\circ}C$. Trend in the chromium concentrations in the ponds is natural > earthen > concrete > collapsible. There was a significant difference (P < 0.05) in chromium, alkalinity, water hardness, pH and temperature among the four ponds. Significant positive correlation also existed between alkalinity, water hardness, pH, with chromium. Morphological and behavioural changes observed in the fish include irregular swimming, frequent coming to the surface, dark body colouration, mucous secretion on the body, erosion of gill epithelium, fin disintegration, abdominal distension and lethargy. High chromium concentration in natural pond was due to anthropogenic run-off of materials in to the pond. Acidic pH, low alkalinity, low water hardness also contributed to the high chromium concentration. Morphological and behavioural changes observed were attributed to the high concentrations, toxicity and bio accumulative effect of the metal. Toxicity of chromium to fish in aquaculture could threaten food security. Watershed best management practices and remediation could be adopted to reduce the effects of toxicity of chromium on pond water quality, fish flesh quality and fish welfare.

Development of novel cilostazol–loaded solid SNEDDS using a SPG membrane emulsification technique: Physicochemical characterization and in vivo evaluation

Mustapha, Omer,Kim, Kyung Soo,Shafique, Shumaila,Kim, Dong Shik,Jin, Sung Giu,Seo, Youn Gee,Youn, Yu Seok,Oh, Kyung Taek,Lee, Beom-Jin,Park, Young Joon,Yong, Chul Soon,Kim, Jong Oh,Choi, Han-Gon Elsevier 2017 Colloids and Surfaces B Vol.150 No.-

<P><B>Abstract</B></P> <P>The objective of this study was to develop a novel solid self-nanoemulsifying drug delivery system (SNEDDS) using a membrane emulsification technique involving Shirasu porous glass (SPG) which produced very small and uniform emulsion droplets, resulting in enhanced solubility, dissolution and oral bioavailability of poorly water–soluble cilostazol. The effects of carriers on the drug solubility were assessed, and pseudo-ternary phase diagrams were plotted. Among the liquid SNEDDS formulations tested, the liquid SNEDDS composed of peceol (oil), Tween 20 (surfactant) and Labrasol (cosurfactant) at a weight ratio of 15/55/30, produced the smallest emulsion droplet size. The cilostazol–loaded liquid SNEDDS formulation was suspended in the distilled water and subjected to SPG membrane emulsification. Calcium silicate was added as a solid carrier in this liquid SNEDDS, completely suspended and spray–dried, leading to the production of a cilostazol–loaded solid SNEDDS. The emulsion droplet size, solubility and dissolution of the emulsified solid SNEDDS were assessed as compared to the solid SNEDDS prepared without emulsification. Moreover, the physicochemical characteristics and pharmacokinetics in rats were evaluated with the emulsified solid SNEDDS. The emulsified solid SNEDDS provided significantly smaller and more uniform nanoemulsions than did the non-emulsified solid SNEDDS. The emulsified solid SNEDDS showed significantly higher drug solubility and dissolution as compared to the non-emulsified solid SNEDDS. The crystalline drug in it was converted into the amorphous state. Moreover, in rats, it gave significantly higher initial plasma concentrations and AUC compared to the drug powder, suggesting its improved oral bioavailability of cilostazol. Thus, this novel solid SNEDDS developed using a membrane emulsification technique represents a potentially powerful oral delivery system for cilostazol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cilostazol-loaded solid SNEDDS was prepared using membrane emulsification technique. </LI> <LI> It was prepared with calcium silicate as a solid carrier. </LI> <LI> It provided smaller and more uniform nanoemulsions than the non-emulsified SNEDDS. </LI> <LI> It gave higher drug solubility and dissolution than the non-emulsified SNEDDS. </LI> <LI> This SNEDDS improved the oral bioavailability of cilostazol. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>