4 research outputs found
Internists' Satisfaction with Clinical Laboratories Services of Basra City: A Pilot Study
No full textBackground: The quality of laboratory services is a very important tool for patient care. Medical decisions in diagnosing disease and providing appropriate treatment mainly depends on the results of laboratory tests jointly with the clinical examination and interview. So this study was conducted to assess the confidence of internists in laboratory services and to analyze the strengths and limitations imposed on these services. Method: A cross sectional study was conducted among 53 respondent internists from government and private sector laboratories in Basra Governorate from 1st of April to 30th of May 2022. This study included doctors specialized in internal medicine in private and public hospitals and clinics. A structured, self-administered questionnaire was used, which consisted of a 2-5 point Likert scale questions with 22 survey principles and two main sections: personal information and data on services provided by laboratories. All participants were informed of the contents of the questionnaire form and gave consent. The collected data were fed to a database made through IBM SPSS statistics for Windows, version 24 to obtain statistical analyzes. After securing validity, reliability analysis was carried out and Alpha Cronbach (0.732) was considered reliable. The average score for each item on the scale was calculated, and an overall degree of physicians' confidence in laboratory services was calculated. Results: Respondents' mean age was 50.62 years and the mean experience years was 20. Most of the respondents were male internists nearly half of them held a doctorate or the Arab/Iraqi board for medical specializations' degrees. The average general-confidence of participants was 58.5%. Nearly half of the internists were satisfied with the laboratory services provided by government hospitals in Basra Governorate. However, there are some services that need attention. For the private sector, mostly (84.9%) of participants preferred private sector laboratories. Conclusion: All the doctors who were included in the study were convinced with services provided by the private sector laboratories, and relationships between internal medicine specialists and laboratory staff were good, which may have a positive impact on the provision of services.
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Analysis of optimized multilevel matrix converter for DFIG based wind energy conversion system
Get PDFWind power generation is an increasing trend worldwide. Multilevel converters in this regard are playing an essential role in high power system applications due to various features. In this paper, multi-objective optimization based multilevel matrix converter (MOMMC) is proposed for wind energy conversion system. The assessment of feasibility through the discussion of two objectives: reliability and cost have been considered in this study. Initially, the model of the two objectives is assessed against redundancy configuration and power loss. Then a multi-objective function is defined for achieving low cost and high reliability. The optimal topology for the matrix multi-level converter is determined using the membership function, and the solution is selected from the Pareto-optimal set. The reliability and cost analysis of the proposed MOMMC is performed. Simulation is carried out for the proposed multi-objective optimization based multilevel matrix converter using the PSIM software. To establish the validity of the proposed method, two different cases: 1) fixed and 2) variable speed of 9 MW doubly-fed induction generator-based wind energy system are considered. The results show the superiority of the proposed method over the others.
Detección de fallos de integridad en sistemas de posicionamiento (GPS) de vehículos aéreos no tripulados (UAVs)
No full textLa justificación de este proyecto se fundamenta en la creciente importancia de los Vehículos Aéreos no Tripulados en misiones militares de alta relevancia, donde su correcto funcionamiento es crucial para el éxito de las operaciones. Los UAVs desempeñan un papel vital en entornos estratégicos, brindando capacidades de reconocimiento y comunicación que inciden directamente en la toma de decisiones y el cumplimiento de objetivos militares.
Un ejemplo ilustrativo de la vulnerabilidad de los UAVs a ataques cibernéticos es el incidente del espectáculo de drones sobre el puerto Victoria en Hong Kong. Este evento, destinado a celebraciones, terminó abruptamente cuando 46 drones perdieron el control y cayeron al mar debido a interrupciones en las señales GPS. Investigaciones preliminares atribuyeron el percance a un acto deliberado de piratería informática. Este incidente destaca las graves implicaciones del spoofing y jamming del GPS, implicando en este caso pérdidas financieras estimadas en HK127,500). [12]
En este contexto, la vulnerabilidad del subsistema GPS en los UAVs se presenta como una preocupación significativa, dado que estas señales carecen comúnmente de encriptación, haciéndolas propensas a ataques cibernéticos. [6] El GPS constituye una pieza fundamental para la navegación y el posicionamiento preciso de los UAVs, y su compromiso puede generar consecuencias graves, como pérdida de curso, análisis erróneo de zonas estratégicas y mayores implicaciones operativas y de seguridad.
En consonancia con la evolución tecnológica constante en el ámbito de los UAVs, los ciberataques también han ido adquiriendo mayor sofisticación y complejidad. La necesidad de resguardar estos sistemas críticos de amenazas emergentes y en constante evolución impulsa la adopción de tecnologías avanzadas en ciberseguridad. Este proyecto no solo busca identificar y comprender a fondo las posibles ciber amenazas al subsistema GPS de los UAVs, sino que también aspira a desarrollar una solución enfocada en la detección y prevención de fallas de integridad.
La aplicación de redes neuronales adaptativas como parte central de esta solución representa un enfoque innovador y prometedor para la detección y prevención de ataques cibernéticos. La simulación de escenarios de ciberataque fortalecerá la efectividad y la aplicabilidad de la solución propuesta. En última instancia, este proyecto aspira a contribuir significativamente al fortalecimiento de la seguridad y operatividad de los UAVs, en un entorno dinámico donde la tecnología y las amenazas cibernéticas evolucionan constantementePregrad
