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Academic Stress Assessment Using Virtual Reality as an Educational Tool in Spine Surgery

Open Journal of Modern Neurosurgery 2024年第2期14卷 114-123页

作者： Diana Chávez Lizárraga Jesús Alberto Pérez Contreras fernando Alvarado Gómez Evelyn Quintero Medina Emmanuel Cantú Chávez Iván Ulises Sámano López Ana Sofía Peña Blesa Department of Neurosurgery ángeles Pedregal Ciudad de México México Department of Traumatology and Orthopedics Hospital Santa Fe Bogotá Colombia

Introduction: The evaluation of academic stress in medical students and residents is a topic of significant interest, given the considerable challenges they face during their learning process with traditional teaching methods. The use of technologies like virtual reality presents an opportunity to enhance their skills through simulations and training. The main objective of this study is to qualitatively assess the stress levels experienced by medical students and residents by integrating virtual reality into their current learning methods, aiming to improve their ability to manage stressors in their practice. Material and Methods: A questionnaire was conducted with 12 medical students and 12 Traumatology and orthopedics residents. The purpose of the questionnaire was to evaluate the levels of academic stress using the SISCO inventory. The stress levels were calculated by transforming average values into percentages, and the following criteria were assigned: 0 to 33% for Mild Stress, 34 to 66% for Moderate Stress, and 67 to 100% for Deep Stress. Then, a virtual reality class focused on spine surgery was provided. Both medical students and residents were trained using the Non Nocere SharpSurgeon software platform and Oculus Quest 2 virtual reality glasses. At the end of the session, a second questionnaire related to the practice with virtual reality was conducted with the same evaluation criteria and a comparative analysis was carried out. Results: 12 undergraduate students from Hospital Angeles Mexico, CDMX and 12 traumatology and orthopedics residents at Hospital Santa Fe, Bogota were evaluated. The students in CDMX reported an average qualitative stress of 28.50% during habitual practices, which decreased to an average of 14.67% after virtual reality practice. Residents in Bogotá experienced an average qualitative stress of 30.50% with their current learning methods but this reduced to an average of 13.92% after using virtual reality. These findings indicate that t

关键词： Virtual Reality Academic Stress Learning Strategies Spine Surgery Training

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Performance Comparison of Field-oriented Control,Direct Torque Control,and Model-predictive Control for SynRMs

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Chinese Journal of Electrical Engineering 2022年第1期8卷 24-37页

作者： Hazem Hadla fernando Santos Polytechnic Institute of Viseu Higher School of Technology and Management of LamegoLamego 5100-074Portugal

Simulation studies of three synchronous reluctance motor(SynRM)control strategies are presented:field-oriented control(FOC),direct torque control(DTC),and finite-set model-predictive control(FS-MPC).FOC uses linear controllers and pulse-width modulation to control the fundamental components of the load voltages *** contrast,DTC and FS-MPC are nonlinear strategies wherein the voltage vectors are directly generated in the absence of a *** operating principles and control structures of these control strategies are ***,a comparative analysis of the static and dynamic performance of the control strategies is conducted using Matlab/Simulink to identify their advantages and *** is confirmed that each of the control strategies has merits and that all three of them satisfy the requirements of modern high-performance drives.

关键词： Field-oriented control direct torque control model-predictive control synchronous reluctance motor

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Betanidin significantly reduces blood glucose levels in BALB/c mice fed with an atherogenic diet

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Natural Products and Bioprospecting 2012年第4期2卷 154-155页

作者： Agustin LUGO-RADILLO Ivan DELGADO-enciso Elpidio PEÑA-BELTRÁN Instituto Nacional de Geriatría Periférico Sur 2767San Jerónimo LídiceMagdalena Contreras10200 México D.F.México Facultad de Medicina Universidad de ColimaAv.Universidad 333Colonia Las Víboras28040 ColimaColimaMéxico Facultad de Ciencias Biológicas y Agropecuarias Universidad de Colima.Carr.Colima-Manzanillo km 4028100 TecománColimaMéxico

Six weeks BALB/c mice were fed with an atherogenic diet for 24 weeks and purified water ad *** experimental group was given betanidin,orally,during the last 40 days of the experiment at a dose of 9.6 mg per mouse per *** controls were fed with standard rodent chow *** was measured at the end of the experiment,after overnight *** group treated with betanidin presented a highly significant reduction of 50.94%compared to positive *** conclude that betanidin reduces glycemia in BALB/c mice by an unidentified mechanism.

关键词： betalains betanidin blood glucose hypoglycemiant

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An ACO-RFD hybrid method to solve NP-complete problems

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Frontiers of Computer Science 2013年第5期7卷 729-744页

作者： Pablo RABANAL Ismael RODRIGUEZ fernando RUBIO Dept. Sistemas Inforrnaiticos y Computacion Facultad de Informatica Universidad Complutense de Madrid Madrid 28040 Spain

In this paper we hybridize ant colony optimiza- tion （ACt） and river formation dynamics （RFD）, two related swarm intelligence methods. In ACt, ants form paths （prob- lem solutions） by following each other＇s pheromone trails and reinforcing trails at best paths until eventually a single path is followed. On the other hand, RFD is based on copy- ing how drops form rivers by eroding the ground and de- positing sediments. In a rough sense, RFD can be seen as a gradient-oriented version of ACt. Several previous experi- ments have shown that the gradient orientation of RFD makes this method solve problems in a different way as ACt. In particular, RFD typically performs deeper searches, which in turn makes it find worse solutions than ACt in the first exe- cution steps in general, though RFD solutions surpass ACt solutions after some more time passes. In this paper we try to get the best features of both worlds by hybridizing RFD and ACt. We use a kind of ant-drop hybrid and consider both pheromone trails and altitudes in the environment. We apply the hybrid method, as well as ACt and RFD, to solve two NP-hard problems where ACt and RFD fit in a different manner： the traveling salesman problem （TSP） and the prob- lem of the minimum distances tree in a variable-cost graph （MDV）. We compare the results of each method and we an- alyze the advantages of using the hybrid approach in each case.

关键词： river formation dynamics ant colony optimization heuristic algorithms NP-hard problems

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How Africa Is Promoting Agricultural Innovations and Technologies amidst the COVID-19 Pandemic

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Molecular Plant 2020年第10期13卷 1345-1346页

作者： Angela Joseph fernando Consultant-The Alliance of Bioversity International and CIAT Km 17 Recta Cali-PalmiraApartado Aéreo 6713763537 CaliColombia

The COVID-19 pandemic has left an indelible mark on Africa's Agribusiness *** of households whose livelihoods depend on farming are facing a huge food *** mitigate these effects,the African Agricultural Technology Foundation(AATF)gathered a panel of renowned agricultural experts through an interactive webinar themed"Promotion of Agricultural Technologies and Innovations for Agri-Business Resilience in Africa in the Wake of COVID-19",the first in a series of several interactive seminars to be held virtually until the end of December *** seminars will focus on several topics specific to agricultural transformation,which revolve around smallholder farmers in Sub-Saharan Africa(SSA)and aim to help them come out of the cataclysmic effect of COVID-19 and recover their business and livelihoods.

关键词： Agricultural Africa interactive

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Complexity of adaptive testing in scenarios defined extensionally

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Frontiers of Computer Science 2023年第3期17卷 11-28页

作者： Ismael RODRÍGUEZ David RUBIO fernando RUBIO Dpto.Sistemas Informáticos y Computación Facultad de InformáticaUniversidad Complutense de MadridMadrid 28040Spain Instituto de Tecnologías del Conocimiento Universidad Complutense de MadridMadrid 28040Spain Instituto de Biomecánica de Valencia.Universitat Politècnica de València València 46022Spain

In this paper,we consider a testing setting where the set of possible definitions of the Implementation Under Test(IUT),as well as the behavior of each of these definitions in all possible interactions,are extensionally defined,i.e.,on an element-by-element and case-by-case *** this setting,the problem of finding the minimum testing strategy such that collected observations will necessarily let us decide whether the IUT is correct or not(i.e.,whether it necessarily belongs to the set of possible correct definitions or not)is studied in four possible problem variants:with or without non-determinism;and with or without more than one possible definition in the sets of possible correct and incorrect *** computational complexity of these variants is studied,and properties such as PSPACE-completeness and Log-APX-hardness are identified.

关键词： formal testing adaptive testing computational complexity PSPACE-completeness approximation hardness

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Allophane as a Nanotechnological Additive in Masonry Materials to Increase Resistance and Waterproofing

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Advances in Materials Physics and Chemistry 2024年第8期14卷 196-212页

作者： Edward H. Jiménez Joao Rivera Juan H. Villalba Paola E. Vera Marlon Cuenca Belén Granja Javier Fuentes Sandra Gavilanes Daniel Hidalgo fernando Garcia Jose Bermudez Washington Ruiz Alexis Martial Debut Facultad de Ingeniera Qumica Universidad Central del Ecuador Quito Ecuador Facultad de Arquitectura y Urbanismo Universidad Central del Ecuador Quito Ecuador Nanomaterials Characterization Laboratory Universidad de las Fuerzas Armadas ESPE Sangolqu Ecuador

The constant need for high-strength materials in the construction industry promotes the research of additives that improve the properties of masonry materials. The use of allophane as an additive in concrete and mortar mixtures was implemented to improve their strength and waterproofing, respectively, using compression and water absorption tests according to their corresponding standards (ASTM C1231, ASTM D2938, and ASTM C1585). The samples were evaluated at different concentrations and curing ages. In addition, different sand/cement ratios were considered for the mortar. The results revealed that there was a 9.4% increase in compressive strength in concrete and a 23.7% reduction in water absorption in mortar for the 5:1 ratio. These changes would be the result of the interaction of the nanoporous additive in the atomic crystal structure of the material demonstrating the nanotechnological nature of allophane.

关键词： Allophane Nano Additive Strength Impermeability Concrete Mortar

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Multiomics approaches to uncover endometrial receptivity in embryo implantation:a mini-review

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Reproductive and Developmental Medicine 2024年第3期8卷 178-185页

作者： Sudini R.fernando Yang Yan Manish Kumar Hoi-Lam Lai Yin-Lau Lee Ernest H.Y.Ng William S.B.Yeung Kai-Fai Lee Department of Obstetrics and Gynaecology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong SAR 999077China Department of Animal Science Faculty of Animal Science and Export AgricultureUva Wellassa UniversityBadullaSri Lanka Shenzhen Key Laboratory of Fertility Regulation The University of Hong Kong-Shenzhen HospitalFutian DistrictShenzhen 518053China

Successful implantation requires concerted interactions during the apposition,adhesion,and invasion of the embryo into a receptive ***,the embryo implantation rate for assisted reproduction remains low despite the transfer of good quality *** in endometrial transcriptomics,proteomics,lipidomics,and even microbiota all play important roles in embryo ***,the expression of steroid hormone-regulated adhesive and anti-adhesive molecules during the embryo implantation window is becoming an area of increasingly intense *** review(a)summarizes the different molecules expressed in the receptive endometrium and(b)proposes the use of surface protein markers to predict pregnancy outcomes from assisted reproduction.

关键词： Cell surface proteins Steroid regulation Endometrial receptivity Receptivity marker Infertility

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Hepatotoxicity Induced by Biological Agents: Clinical Features and Current Controversies

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Journal of Clinical and Translational Hepatology 2022年第3期10卷 486-495页

作者： Nelia Hernandez fernando Bessone Hospital de Clinicas Universidad de la RepublicaMontevideoUruguay Hospital Provincial del Centenario University of Rosario School of MedicineRosarioArgentina

Novel biological agents including cytokines and recombinant fusion proteins are increasingly prescribed for cancer,rheumatologic,autoimmune,and inflammatory diseases,and are currently being evaluated in hepatocellular carcinoma(HCC).They are classified by their mechanism of action and include tumor necrosis factor-alpha(TNF-α)antagonists,T cell mediated antitumor inhibitors,interleukin receptor antagonists,and immune checkpoint inhibitors(ICIs).Some ICIs cause frequent hepatotoxicity with a variable clinical,biochemical,and serological presentation,especially in patients receiving another immunomodulatory *** of the cases of liver damage induced by biological agents spontaneously regress after drug withdrawal,but the others require steroid ***,there are no widely accepted recommendation for the use of corticosteroids in these patients,even though international cancer societies have their own *** drug-induced autoimmune hepatitis(DIAIH)from classic AIH is challenging for pathologists,but liver biopsy is valuable,particularly in cases with unclear clinical ***,novel histological patterns have been described in liver damage induced by these agents(i.e.,endothelitis,ring granuloma and secundary sclerosing cholangitis associated with lymphocytic infiltration of cytotoxic CD8+T cells).Here,we describe the clinical and biochemical characteristics of patients with hepatotoxicity induced by TNF-αantagonists and *** issues involved in the administration of corticosteroid therapy,and hepatitis B virus(HBV)reactivation induced by immunosuppressive therapy are also discussed.

关键词： Hepatotoxicity Checkpoint inhibitors Biologics Autoimmune hepatitis Drug-induced liver injury

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Nonalcoholic fatty liver disease in type 2 diabetes: awareness is the first step toward change

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Hepatobiliary Surgery and Nutrition 2020年第4期9卷 493-496页

作者： fernando Bril Division of Endocrinology University of FloridaGainesvilleFLUSA Diabetes and Metabolism 2Internal MedicineDepartment of MedicineUniversity of FloridaGainesvilleFLUSA

In a recent article published in J Hepatol,Younossi et *** a comprehensive systematic review and meta-analysis on the prevalence of NAFLD,NASH and advanced fibrosis in patients with type 2 diabetes mellitus(T2DM)across the globe(1).Among the 80 studies included in the final analysis(for a total of 49,419 patients)the prevalence of NAFLD was between 50–70%in all continents,except for Africa,where a prevalence of 30.4%was *** lower prevalence of NAFLD in Africa is consistent with prior reports showing a lower prevalence of NAFLD among African-American individuals(2,3).Of note,once African-American patients develop NAFLD,their progression to NASH and advanced fibrosis is similar to other ethnic groups,and still a significant cause of cirrhosis in this population(4).

关键词： NAFLD prevalence al.

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