We analyze the influence of tax progression on optimal investment policy and its value. We show that three possible optimal regimes arise, depending on the nature of the tax policy. If the exogenously given progression threshold lies between the optimal capital stocks in the case of higher and lower marginal profit taxes, then the optimal investment policy is independent of profit tax rates. Bu...

I n a call center, staffing decisions must be made before the call arrival rate is known with certainty. Once the arrival rate becomes known, the call center may be over-staffed, in which case staff are being paid to be idle, or understaffed, in which case many callers hang-up in the face of long wait times. Firms that have chosen to keep their call center operations in-house can mitigate this ...

In the paper, we propose three threshold secret sharing schemes that are based on difference equations. The first scheme is a (t, n)− threshold scheme which is an ideal perfect secure. The other two schemes add the restricted order structure to the set of shadows and the access structure of secret sharing policy. The basis of the access structure of one scheme allows that only subsets that cont...

The distributional effects of some proposed Social Security law changes (for example, an increase in Social Security’s early entitlement age (EEA)) are at least partially dependent on the distribution of health and mortality risk throughout the fully insured Social Security–covered worker population. To evaluate these types of proposals, retirement policy analysts typically tabulate the percent...

This paper studies the N policy M/G/1 queue with server vacations; startup and breakdowns, where arrivals form a compound Poisson process and service times are generally distributed. The server is turned off and takes a vacation whenever the system is empty. If the number of customers waiting in the system at the instant of a vacation completion is less than N, the server will take another vaca...

This paper investigates the steady state property of queue length for a batch arrival queue under N-policy with single vacation and setup times. When the system becomes empty, the server is turned off at once and takes a single vacation of random length V . When he returns, if the queue length reaches or exceeds threshold ( 1) N N  , the server is immediately turned on but is temporarily unava...

vspace{0.2cm}In this paper, we design a data structure for the following problem. Let $pi$ be an $x$-monotone trajectory with $n$ vertices in the plane and $epsilon >0$. We show how to preprocess $pi$ and $epsilon$ into a data structure such that for any horizontal query segment $Q$ in the plane, one can quickly determine the minimal continuous fraction of $pi$ whose Fr{'e}chet and Hausdo...

cardiac function during exercise is assumed to be important in determining exercise tolerance. the aim of this study was to evaluate hemodynamic changes of blood flow at anaerobic threshold and its effect on exercise tolerance. 24 patients with coronary artery disease were voluntarily divided into two groups of experimental (n=12) and control (n=12). the experimental group participated in 8 wee...

Red Blood Cell (RBC) transfusion is an integral part of many medical treatments and surgeries. Recently, a growing body of research suggests a correlation between the age of transfused blood and adverse clinical outcomes for its recipients. Therefore, there is a need for effective and practical inventory management policies which could reduce the age of transfused RBC units without compromising...

This paper introduces a threshold policy with hysteresis (TPH) for the control of the logistic onespecies model. A nonstandard scheme is used for the discretization of the model since it results in preservation of the qualitative characteristics of the continuous-time models. Two theorems that establish the global stability of the logistic discrete model subject to the threshold policy (TP) and...