Absfract-We a d h the pmblem of designing optimal bufYer management policies in shared memory switches when packets already accepted in the switcb can be dropped (pushed*ut). Our goal is to maximize the overall throughput, or equivalently to d n h h e the overall loss probability in the system. For a system with two output ports, we prove that the optimal policy is of push-out with threshold ty...

Consider the problem of a controller sampling sequentially from a finite number of N ≥ 2 populations, specified by random variables X k, i = 1, . . . , N, and k = 1, 2, . . .; where X i k denotes the outcome from population i the k time it is sampled. It is assumed that for each fixed i, {X k}k≥1 is a sequence of i.i.d. uniform random variables over some interval [ai, bi], with the support (i.e...

An embedded Markov chain is used to analyze a G/M/1 queuing system with N policy. When the system is empty, the server remains idle (deactivates) and does not start serving the waiting customers in the queue until the number of arrivals reaches N. The service is performed in batches of min(n, N) if there are n customers waiting at the completion of service. Service times of the server depend o...

This article addresses policymaking related to Emergency Care Units (ECU) in the State of Rio de Janeiro between 2007 and 2013, duly identifying the relationships between the various levels of government in this process. It prioritized the context of policy formulation, the factors that motivated the inclusion and maintenance of ECUs on the state agenda and the process of how the policy was imp...

In this paper we consider policies for scheduling cells in an input-queued multicast switch. It is assumed that each input maintains a single queue for arriving multicast cells and that only the cell at the head of line (HOL) can be observed and scheduled at one time. The policies are assumed to be work-conserving, which means that cells may be copied to the outputs that they request over sever...

Recently, much emphasis has given to study the control and maintenance of production inventories of the deteriorating items. Rework is one of the main issues in reverse logistic and green supply chain, since it can reduce production cost and the environmental problem. Many researchers have focused on developing rework model, but few of them have developed model for deteriorating items. Due to t...

let $r$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎a right $r$-module $m$ is called $(n‎, ‎d)$-projective if $ext^{d+1}_r(m‎, ‎a)=0$ for every $n$-copresented right $r$-module $a$‎. ‎$r$ is called right $n$-cocoherent if every $n$-copresented right $r$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $r$-module is $(n‎, ‎d)$-projective‎. ‎$r$ ...

BACKGROUND Removing user fees in primary health care services is one of the most critical policy issues being considered in Africa. User fees were introduced in many African countries during the 1980s and their impacts are well documented. Concerns regarding the negative impacts of user fees have led to a recent shift in health financing debates in Africa. Kenya is one of the countries that hav...

mndo semi-empirical scf mo calculations are used to study the pyramidal nitrogen atom inversion and configurational equilibria in the title compounds.