Li-Fi (Light Fidelity) is an important green technology being sought after these days. It is used in environments where Wi-Fi is a constraint, for example in hospitals, airplanes, schools, security installations, etc and areas where higher bandwidth and faster data speeds are required since Wi-Fi signals may interfere destructively with the existing signals generated by these environments. Li-Fi provides security by obeying the principle of the line of sight (LoS) and prevents the signals from leaking out of the room, hence preventing eavesdropping. The Li-Fi technique without modifications for optical communication, degrades and disables the transmitting signal to navigate far within the room. Various factors can be enhanced and adapted to improve the overall efficiency and efficacy, such as modulation, LED and Photodiode arrays in a particular geometrical pattern, alignment and synchronization, optical filters, and lenses to guide the transmitting signal onto the receiver for optimal output response. The paper proposes the improvement of Li-Fi transmission range using modulation techniques in an indoor environment. The authors have demonstrated experimentally, how the LED transmission of signal data through Li-Fi link is improved by implementing a simple OOK modulation. We have also demonstrated the transmission of the data packet of the patients by performing OOK with PWM modulation for transmission and sending a flicker free and constant light current. By doing this the transmission range was improved to 3mtrs, which is Quite acceptable.
Um surto de pneumonia associado a um novo coronavírus, surgiu em Dezembro de 2019 na cidade de Wuham, província de Hubei na China e foi denominado por Síndrome Agudo Respiratório Severo Coronavírus 2 (SARS-CoV-2). Este vírus é altamente contagioso, o que levou à adaptação de novas técnicas de atuação em contexto hospitalar, nomeadamente no Bloco Operatório. Confrontado com esta nova realidade, o Técnico de Radiologia que tem uma participação cada vez mais relevante em várias intervenções cirúrgicas, tem agora uma responsabilidade acrescida no manuseamento dos seus equipamentos e no correto uso de equipamentos de proteção individual de forma a reduzir os riscos de disseminação do agente infecioso entre profissionais e pacientes. Este estudo advém da experiência que a Equipa Técnica de Radiologia obteve através de uma intervenção cirúrgica realizada no Centro Hospitalar e Universitário de Coimbra (CHUC) a um doente com COVID-19 positivo. Foram retiradas diversas conclusões deste estudo, como por exemplo a enorme importância de uma boa comunicação interdisciplinar e a criação de protocolos de procedimentos em Bloco Operatório adequados a doentes COVID-19 positivos por parte da Equipa Técnica de Radiologia.
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