Background.It has been suggested that contrast sensitivity can provide valuable information about visual function in addition to visual acuity assessment.Some patients retain relatively good visual acuity, yet complain of poor vision.In these patients, other tests of visual function such as contrast sensitivity should be evaluated.Methods.We examin
Mobility is a key factor that influences the spatial and temporal fluctuation of wireless traffic, which is highly coupled with the user experience.Previous researches barely explore the properties of the traffic when the mobility is considered.In this paper, by combining stochastic geometry and queueing theory, we model the spatio-temporal propert
Patent thickets create external resource constraints that reduce the market value of enterprises.In the process of technological innovation, it is no longer possible to obtain competitive advantage by relying on individual resource endowment alone.Patent cooperation is considered an important institutional element in social network relations, throu
Xenotransplantation is emerging as a vital solution to the critical shortage of organs available for transplantation, significantly propelled by advancements in genetic engineering and the development of sophisticated immunosuppressive treatments.Specifically, the transplantation of kidneys from genetically engineered pigs into human patients has m
This study considers a system of multi-server queues with two classes of impatient customers: Heels high-priority and low-priority.Customers join the system according to a Poisson process and customers may abandon service after entering the queue for an exponentially distributed duration with distinct rates.In this paper, we consider last come-firs