We consider a queueing system with c servers and a threshold type vacation policy. In this system, when a certain number d<c of servers become idle at a service completion instant, these d servers will take a synchronous vacation of random length together. After each vacation, the number of customers in the system is checked. If that number is N or more, these d servers will resume serving the ...

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We consider an inventory model for spare parts with two stockpoints, providing repairable parts for a critical component of advanced technical systems. As downtime costs for these systems are huge, ready-for-use spare parts are kept on stock, to be able to quickly respond to a breakdown of a system. We allow for lateral transshipments of parts between the stockpoints upon a demand arrival for a...

This paper develops some important concepts with respect to networks and compatibility. We note that the familiar concept of complementarity lies at the heart of the concept of compatibility. We further note the distinction between two-way networks (e.g., telephones, railroads, the Internet) and one-way networks (e.g., ATMs, television, distribution and service networks). In the former, additio...

I propose a generalization of the probabilistic voting model in two-candidate elections. Unlike in all previous works, I assume that the candidates have general von Neumann-Morgenstern utility functions defined over the voting outcomes. For a finite number of voters, I derive necessary and sufficient conditions for the existence of a local Nash equilibrium in which the policy platforms of the c...

the first step in policy making is describing the objectives and choosing the policy instruments and management strategies and then, analyzing and assessing the impacts of them. in this study, farmers’ responses to selected policy instruments and management strategies were assessed using a semi-distributed planning model in qazvin irrigation and drainage network. the proposed model, simulates t...

this paper analyzes a controllable discrete-time machine repair problem withl operating machines and two repairmen. the number of working servers can be adjusteddepending on the number of failed machines in the system one at a time at machine&apos;s failure orat service completion epochs. analytical closed-form solutions of the stationary probabilities ofthe number of failed machines in the sys...

This paper explores the role of public policy in the development of tourism in Jamaica. It focuses on two separate and contrasting periods. In the first, 1972–80, referred to here as ‘The Socialist Era’, the Jamaican government pursued goals of self-reliance combined with seeking to integrate tourism into Jamaican life. In the second period, 1980–89, ‘The Period of Capitalism’, emphasis was shi...

Sound environmental regulation must achieve environmental objectives while maximizing economic efficiency. This paper evaluates the impact of regulation on efficiency by measuring annual productivity across regulatory regimes in two similar fisheries with differing policy expectations. Anticipation of regulatory change produced strategic behavior in one fishery, leading to depressed productivit...