Abstract The existing typical combined query image retrieval methods adopt Euclidean distance as sample distance measurement method, and the model trained by triple loss function blindly pursues absolute distance between samples, resulting in unsatisfactory image retrieval performance.Meanwhile, these methods singularly adopt Convolutional Neural N
The existence of exclusive rights to produce or supply services means a monopoly.Often it is called a natural monopoly.Exclusive rights are granted for a long period of time, which should encourage major investments in infrastructure, the development of which is unlikely to occur without a guaranteed market.But sometimes exclusive rights are used i
Objective We studied the safety and efficacy of hydroxychloroquine (HCQ) as pre-exposure prophylaxis for COVID-19 in healthcare workers (HCWs), using a meta-analysis of randomised controlled trials (RCTs).Data sources PubMed and EMBASE databases were searched to identify randomised trials studying HCQ.Study selection Ten RCTs were Accessories ident