in this paper, a new stage structured prey-predator model with linear functional response is proposed and studied. the stages for prey have been considered. the proposed mathematical model consists of three nonlinear ordinary differential equations to describe the interaction among juvenile prey, adult prey and predator populations. the model is analyzed by using linear stability analysis to ob...

abstract background: rehabilitation of facial paralysis is one of the greatest challenges faced by reconstructive surgeons today. the traditional method for treatment of patients with facial palsy is the two-stage free gracilis flap which has a long latency period of between the two stages of surgery. methods: in this paper, we prospectively compared the results of the one-stage gracilis flap m...

Data envelopment analysis (DEA) is a method for measuring the efficiency of peer decision making units (DMUs) which uses a set of inputs to produce a set of outputs. In some cases, DMUs have a two-stage structure, in which the first stage utilizes inputs to produce outputs used as the inputs of the second stage to produce final outputs. One important issue in two-stage DEA is the sensitivity of...

Data envelopment analysis is a nonparametric technique checking efficiency of DMUs using math programming. In conventional DEA, it has been assumed that the status of each measure is clearly known as either input or output. Kao and Hwang (2008) developed a data envelopment analysis (DEA) approach for measuring efficiency of decision processes which can be divided into two stages. The first stag...

A retrospective review of all British Army patients presenting to the Queen Elizabeth Military Hospital with a diagnosis of Hodgkin's disease between 1977 and 1987 was performed, with a minimum follow-up of 7 years. The results were similar to those reported in other (similar) series, and the changes in investigations and treatment observed during this period matched those occurring in wider cl...

chronic kidney disease is one of the most common complication of systemic lupus erythematosus, which if untreated can lead to  the end-stage renal disease (esrd). early diagnosis and adequate treatment of lupus nephritis (ln) is critical to prevent the chronic kidney disease incidence and to reduce the development of esrd. the treatment of ln has changed significantly over the past decade. in p...