We will be concerned here with efficiencies of point-to-point and multidrop links. Directly or indirectly, these efficiencies translate to dollars. For instance, a point-to-point link often takes the form of a leased high-quality telephone line, which may be very expensive. In the case of a multidrop link, the line may be owned rather than leased, but if its efficiency is too small, its users w...

AbstractWe propose a dial-up optical access architecture that allows an end host to dynamically request and receive a high-speed circuit for connection to its Internet Service Provider’s router. We carry out an analytical comparison of the current leased-line architecture and our proposed dial-up architecture for access networks. It shows significant capacity savings, for example, savings of 39...

It is difficult to predict future traffic precisely although it is assumed that the amount of future traffic is predictable in many researches on a multi-period planning for WDM networks. In this paper, we propose a wavelength-routing algorithm that maximizes the number of accommodated lightpaths without precise prediction of future traffic demand. Since our algorithm reduces the number of leas...

In this paper, we investigate two dimensional leased contracts for a dump truck operated in a mining industry. To keep the truck in a good operational condition, an imperfect preventive maintenance (PM) policy is applied. When the truck fails then corrective maintenance (CM) is done. PM and/or CM can be leased to an external agent or a lessor for an economic reason. The situation under study is...

introduction: one of the fundamental issues in the agricultural sector in iran is the absence of optimal water and soil resources utilization and lack of new agricultural science and technology adoption through major prevailing transformations in agricultural land exploitation system. the studies conducted in the history of agricultural development in iran cast light on the fact that the farmin...

In the future the Mallee is going to be hot and dry. Farming in the Mallee is going to be very profitable sometimes, middling profitable in some years and not profitable at all at times as has always been the case. In 10 years time there will be less Mallee farmers; they will be farming a little differently to now; and most will earn a good living. The scale of operations will be greater. The r...

The focus of the Japanese local telecommunications policy is moving toward how to solve the problem of the digital divide that accompanies the spread of high-speed and broadband services. This paper estimates the translog cost function of two outputs, the standard telephone service and the leased circuit service, and measures the regional gap of those stand-alone costs and incremental costs. Th...

This paper presents a knowledge-based approach to the design of leased line networks. The tool OPTOLL assists in the optimization of networks by applying in a successive way a number of rules based on heuristics. The optimization so far is driven by the costs of the network, but other optimization criteria can be implemented in an easy way by modifying the knowledge base. The optimization start...

Given a communication demand between each pair of nodes of a network, we consider the problem of deciding what capacity to install on each edge of the network in order to minimize the building cost of the network and to satisfy a given demand between each pair of nodes. The feasible capacities that can be leased from a network provider are of a particu­ lar kind in our case. There are a few so-...