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Anesthesiological Management of Eclampsia in Tropical Africa: Experience of the University Hospital Center of Bouake

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Open Journal of Anesthesiology 2018年第3期8卷 93-99页

作者： Kouadio konan Stéphanie Irié Bi Gohi Serge Pete Yaich Koffi N’Guessan Yao Kouassi Christian Ogondon Bernard Nda-Koffi Cinthia Samake Yaya kouame konan edmond Brouh Yapo Anesthesia-Intensive Care Unit Bouake Hospital Bouake Ivory Coast Pediatric Department Bouake Teaching Hospital Bouake Ivory Coast Obstetrics and Gynecology Department Bouake Teaching Hospital Bouake Ivory Coast

Introduction: Eclampsia is a common cause of maternal mortality in developing countries. The objective of this study is to evaluate the practice of anesthesia for eclampsia in tropical Africa. Patients and Methods: Retrospective descriptive study on the parturients who benefited from eclampsia anesthesia in the operating theaters of the gynecology and obstetrics department, the University Hospital Center (CHU) of Bouake over a two-year period (January 2015 to December 2016). The parameters studied were: anesthetic risk assessment, anesthetic management, immediate anesthetic and post-anesthetic accidents and incidents. Results: Out of a total of 3831 emergency cesarean sections, 65 were for eclampsia, or 1.69% of obstetrical surgical activity. The mean age of the patients was 20.30 ± 3.34 years (range: 14 years and 39 years). Prenatal consultation was not performed in 70% of cases and 85% of patients were primiparous. Patients classified as ASA IIIU accounted for 75% of the population and in 62% of cases, the Glasgow score was between 9 and 12. Induction was achieved with thiopental in 98% of patients and vecuronium was the only muscle relaxant used. The most common fetal complications were hypotrophy (50%), prematurity (30%) and respiratory distress (40%). Postoperative anesthetic complications were agitation (70%) and wake delay (15%). Maternal mortality was 5% and the neonatal death rate was around 7.69%. The elements of poor maternal prognosis were the ASA IVU class (P = 0.015) and the Aldrete awakening score between 3 and 5 awakening (P = 0.001). Conclusion: Anesthesia for eclampsia at CHU of Bouake is difficult. It needs to be improved thanks to better equipment of the health structures.

关键词： Eclampsia Emergency Anesthesiology Ivory Coast

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Primary Malignant Bones Cancers in Cote d’Ivoire: Epidemiological and Histopathological Aspects

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Open Journal of Pathology 2018年第2期8卷 51-59页

作者： Kone Samba J. N’dah kouame R. Kouakou konan A. Ngandjeu Nawé Doukoure Brahima Bana Abdoulaye Eti edmond Agoh Serge Service de Traumatologie-CHU de Cocody Abidjan Cote d’Ivoire Service d’Anatomie et Cytologie Pathologiques-CHU de Cocody Abidjan Cote d’Ivoire Service de Stomatologie-CHU de Cocody Abidjan Cote d’Ivoire Service de Rhumatologie-CHU de Cocody Abidjan Cote d’Ivoire

Primary bones cancers are rare and ubiquitous malignant tumors. Aim: Our study aimed was to describe the epidemiological and histopathological aspects of primary malignant bone cancers in Ivory Coast. Material and method: This is a retrospective and descriptive study of primary malignant bone cancers diagnosed over the period 1990 to 2013 (24 years). The studied parameters were: epidemiological aspects (frequency, age, sex, topography) and histological aspects. Results: Over the study period, primary malignant bone cancers accounted for 1.93% (n = 228) of cancers. The average age was 27.02 years with extremes of 2 and 85 years. The sex ratio was 1.65. They were in the skull and maxilla in 43.9% (n = 105), lower limbs (23.8%), spine and ribs (19.8%), pelvis (5.3%) and upper limbs (2.3%). The clinic was dominated by pain and alteration of general state. Radiology was variable depending on the histological type. In children, primary malignant bone cancers were found in the maxillary (77.9%) and the lower limb (15.8%). Burkitt’s lymphomas represented 36.4% (n = 66) of the histological types followed by 22.4% osteosarcomas (n = 51). In adults at histology, sarcomas were the most common (10%), followed by cancers of the hematopoietic and lymphatic organs (8.09%). Conclusion: Primary malignant bone cancers are rare in Ivory Coast. They most often affect male children with maxillofacial involvement and predominant lower extremity. Burkitt’s lymphoma and osteosarcoma are the often diagnosed histological types.

关键词： Cancers Bones Epidemiology Histopathology Cote d’Ivoire

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Bionic MEMS for Touching and Hearing Sensations: Recent Progress, Challenges, and Solutions

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Journal of Bionic Engineering 2022年第3期19卷 590-615页

作者： Chang Ge edmond Cretu Department of Electrical and Computer Engineering The University of British ColumbiaVancouverBCV6T 1Z4Canada

This paper reviews the recent progress on bionic microelectromechanical systems(MEMS)used for touching and hearing sensations,focusing on the following three types of devices:MEMS tactile sensors,MEMS directional microphones,and MEMS vector *** reviewing the electromechanical coupling principles,design,and performance of these MEMS devices,the authors conclude that it is vital for future research efforts in bionic MEMS to focus more on microfabrication *** development of robust microfabrication flows is the basis to implement hybrid electromechanical coupling principles based on novel functional ***-quality polymeric micromachining technologies can also significantly enhance the potential of existing bionic MEMS designs for more practical applications.

关键词： Bionic MEMS Tactile sensor Directional microphone Vector hydrophone Polymeric micromachining PDMS SU-8

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A polymeric piezoelectric MEMS accelerometer with high sensitivity,low noise density,and an innovative manufacturing approach

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Microsystems & Nanoengineering 2023年第6期9卷 149-164页

作者： Chang Ge edmond Cretu The Department of Electrical and Computer Engineering The University of British ColumbiaVancouverCanada

The piezoelectric coupling principle is widely used(along with capacitive coupling and piezoresistive coupling)for MEMS *** MEMS accelerometers are used primarily for vibration *** piezoelectric MEMS accelerometers offer the merits of heavy-metal-free structure material and simple microfabrication *** importantly,polymeric piezoelectric MEMS accelerometers may be the basis of novel applications,such as fully organic inertial sensing microsystems using polymer sensors and organic integrated *** paper presents a novel polymer piezoelectric MEMS accelerometer design using PVDF films.A simple and rapid microfabrication flow based on laser micromachining of thin films and 3D stereolithography was developed to fabricate three samples of this *** proof-of-concept experiments,the design achieved a sensitivity of 21.82 pC/g(equivalent open-circuit voltage sensitivity:126.32 mV/g),a 5%flat band of 58.5 Hz,and a noise density of 6.02µg/√***,this design rivals state-of-the-art PZT-based counterparts in charge sensitivity and noise density,and it surpasses the performance capabilities of several commercial MEMS ***,this design has a 10-times smaller device area and a 4-times larger flat band than previous state-of-the-art organic piezoelectric MEMS *** experimentally validated performance metrics demonstrate the promising application potential of the polymeric piezoelectric MEMS accelerometer design presented in this article.

关键词： piezoelectric accelerometer noise

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Polymeric piezoelectric accelerometers with high sensitivity,broad bandwidth,and low noise density for organic electronics and wearable microsystems

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Microsystems & Nanoengineering 2024年第3期10卷 63-74页

作者： Chang Ge edmond Cretu The Department of Electrical and Computer Engineering The University of British ColumbiaVancouverBCCanada

Piezoelectric accelerometers excel in vibration *** the emerging trend of fully organic electronic microsystems,polymeric piezoelectric accelerometers can be used as vital front-end components to capture dynamic signals,such as vocal vibrations in wearable speaking assistants for those with speaking ***,high-performance polymeric piezoelectric accelerometers suitable for such applications are *** organic compounds such as PVDF have inferior properties to their inorganic counterparts such as ***,most existing polymeric piezoelectric accelerometers have very unbalanced performance *** often sacrifice resonance frequency and bandwidth for a flat-band sensitivity comparable to those of PZT-based accelerometers,leading to increased noise density and limited application *** this study,a new polymeric piezoelectric accelerometer design to overcome the material limitations of PVDF is *** new design aims to simultaneously achieve high sensitivity,broad bandwidth,and low *** samples were manufactured and characterized,demonstrating an average sensitivity of 29.45 pC/g within a±10 g input range,a 5%flat band of 160 Hz,and an in-band noise density of 1.4μg/√*** results surpass those of many PZT-based piezoelectric accelerometers,showing the feasibility of achieving comprehensively high performance in polymeric piezoelectric accelerometers to increase their potential in novel applications such as organic microsystems.

关键词： piezoelectric polymeric overcome

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Interference Suppression and Jitter Elimination Ability-Based Adaption Tracking Guidance for Robotic Fishes

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 126-137页

作者： Dongfang Li Jie Huang Rob Law Xin Xu Limin Zhu edmond Q.Wu IEEE the School of Electrical Engineering and Automation Fuzhou University the Key Laboratory of System Control and Information Processing Ministry of Education the School of Electrical Engineering and Automation Fuzhou University 5G+Industrial Internet Institute Fuzhou University the University of Macau the College of Mechatronics and Automation National University of Defense Technology the School of Mechanical Engineering Shanghai Jiao Tong University the Department of Computer Science and Engineering Shanghai Jiao Tong University

This work presents an adaptive tracking guidance method for robotic fishes. The scheme enables robots to suppress external interference and eliminate motion jitter. An adaptive integral surge line-of-sight guidance rule is designed to eliminate dynamics interference and sideslip issues. Limited-time yaw and surge speed observers are reported to fit disturbance variables in the model. The approximation values can compensate for the system's control input and improve the robots' tracking ***, this work develops a terminal sliding mode controller and third-order differential processor to determine the rotational torque and reduce the robots' run jitter. Then, Lyapunov's theory proves the uniform ultimate boundedness of the proposed method. Simulation and physical experiments confirm that the technology improves the tracking error convergence speed and stability of robotic fishes.

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Formulation of Motor Oil from Blends of Rubber Latex Cup Bottom Oil (RLBO) and Used Frying Oil (UFO)

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Journal of Sustainable Bioenergy Systems 2024年第3期14卷 35-43页

作者： konan edmond Kouassi Abollé Abolle Dogafolô Soro Tindo Sylvie konan David Boa Kouassi Benjamin Yao Laboratoire de Thermodynamique et Physico-Chimie du Milieu (LTPCM) UFR-SFA UNA Abidjan Cte dIvoire Laboratoire des Procds Industriels de synthse de lEnvironnement et des Energies nouvelles (LAPISEN) de lInstitut National Polytechnique Flix Houphout Boigny de Yamoussoukro Yamoussoukro Cte dIvoire

Most motor oils are made from mineral oils derived from petroleum, the reserves of which are limited and exhaustible. The aim of this study is to produce and characterize motor oil formulations based on mixtures of rubber latex cup bottom oil (RLCBO) and used frying oil (UFO). The results show that these formulations have a density between 0.91 and 0.92. These densities evolve linearly with the proportion of cup bottom oil and temperature. Similarly, the kinematic viscosity of the blends follows an exponential relationship with temperature. By plotting the logarithm of these kinematic viscosities against the inverse of the temperature, we were able to determine the activation energy of the various blends and deduce that the formulations behave Newtonian.

关键词： Formulation Oils Blend Motor Oils Latex Bottoms Oil

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Optimization designed large-stroke MEMS micromirror for adaptive optics

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Chinese Optics Letters 2010年第12期8卷 1163-1166页

作者：孙全 Kelly He edmond Cretu College of Optoelectronics Science and Engineering National University of Defense Technology Department of Electrical and Computer Engineering University of British Columbia

A novel micromirror based on the PolyMUMPs process is designed and presented. The hexagonal micromirror with a diameter of 450 μm consists of three supporting bilayer cantilevers and a mirror plate. The bilayer cantilevers, formed with a polysilicon layer and a gold layer, elevate the mirror plate according to residual stress-induced bending. Both analytical and finite element analysis （FEA） models are built to calculate the elevated height of the free end of the cantilever. The analytical solution is in accordance with the FEA simulation results, with longitudinal stresses applied only. Results of a three-dimensional （3D） simulation with two direction stresses applied also show the elevated height to be proportional to the width of the cantilever and the length of the gold layer. Due to the torque of the joint, the elevated heights of the two kinds of cantilevers assembled with the mirror plates are much smaller than those of the free end of the cantilevers. Both micromirrors with different cantilevers are fabricated. The elevated heights of the fabricated micromirrors are measured using Veeco optical profiler, which show good coincidence with simulation results.

关键词： Finite element method Microelectromechanical devices Mirrors Polysilicon Three dimensional Three dimensional computer graphics

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Physical and Chemical Characterizations of Rubber Latex Cup Bottom Oil

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Advances in Bioscience and Biotechnology 2024年第9期15卷 511-521页

作者： Kouassi konan edmond Abolle Abollé Aketchi Tanoé Lucien konan Affoué Tindo Sylvie Boa David Yao Kouassi Benjamin Laboratoire de Thermodynamique et Physico-Chimie du Milieu (LTPCM) Unit de Formation et de Recherche Sciences Fondamentales et Appliques Universit Nangui Abrogoua Abidjan Cte dIvoire Laboratoire des Procds Industriels de synthse de lEnvironnement et des Energies Nouvelles (LAPISEN) de lInstitut National Polytechnique Flix Houphout Boigny de Yamoussoukro Yamoussoukro Cte dIvoire

Rubber latex is an important economic resource. However, the residues from its harvesting are thrown away, even though they contain lipids that can be recycled. This recovery of the residues from the bottom of the cup requires first and foremost their characterization. The aim of this study is therefore to determine the main physical and chemical characteristics of rubber latex cup bottom oil. Oil’s physical parameters determination shows that it has a density of 951 kg∙m−3, a kinematic viscosity of 48.57 cSt and a water content of 0.0845%. Chemical parameters, meanwhile, indicate that this cup bottom residue has a fat content of 95.96%, an acid number of 2.805 mg KOH/g and an iodine number of 92.42 g I2/100g. Therefore, rubber latex cup bottom oil can be used in the formulation of biofuels, biolubricants, paints, varnishes, alkyd resins, polishing oils, soaps, and insecticides.

关键词： Rubber Latex Cup Bottoms Oil Density Viscosity Characterizations

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Three trajectories for narrative visualisation

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Visual Informatics 2021年第2期5卷 26-40页

作者： Cameron edmond Tomasz Bednarz Expanded Perception&Interaction Centre(EPICentre) School of Art&DesignUNSWSydney NSWAustralia CSIRO’s Data61 Sydney NSWAustralia

Narrative Visualisation(NarVis)is the pairing of data visualisation with narrative *** to its interdisciplinary applications and scholarship,NarVis presentations often feature vastly different interpretations of"narrative"and"visualisation",which is echoed in NarVis authoring *** map the morphology of how the narratives of NarVis manifest,we identify three different trajectories for the *** trajectories are identified through an analysis of selected NarVis presentations and tools,with an emphasis on identifying how traditional narrative techniques are adopted,transposed or indeed challenged by NarVis *** then populate our categories with additional examples and tools,providing a foundational point of reference for NarVis scholars,authors and tool developers.

关键词： Visualisation Narrative techniques Communication Storytelling Interaction design

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