the computer industry has defined the ieee 802.16 family of standards that will enable mobile devices to access a broadband network as an alternative to digital subscriber line technology. as the mobile devices join and leave a network, security measures must be taken to ensure the safety of the network against unauthorized usage by encryption and group key management. ieee 802.16e uses multica...

As the NSFNET backbone service migrates into a commercial environment, so will access to the only set of publicly available statistics for a large national U.S. backbone. The transition to the new NSFNET program, with commercially operated services providing both regional service as well as cross-service provider switching points, or Network Access Points (NAPs), will render statistics collecti...

In the case of next generation wireless networks, different users with various multi-homed personal wireless devices will aim to exploit the full potential of the choice of services and applications available over different radio access networks. In their selection of a certain radio access network consumers will consider money and delay preferences for the current application and will rely on ...

When packet filtering is used as a security mechanism, different routers may need to cooperate to enforce the desired security policy. It is difficult to ensure that they will do so correctly. We introduce a simple language for expressing global network access control policies of a kind that filtering routers are capable of enforcing. We then introduce an algorithm that, given the network topol...

Ethernet topology discovery has gained increasing interest in the recent years. This trend is motivated mostly by increasing number of carrier Ethernet networks as well as the size of these networks, and consequently the increasing sales of these networks. To manage these networks efficiently, detailed and accurate knowledge of their topology is needed. Knowledge of a network's entities and the...

extended abstract 1. introduction the important roles played by green space are the social, economic, cultural and environmental aspects of sustainable development. thus, the quality and quantity of green space should be appropriate to the physical size of the city and the needs of society and also it should be developed according to the ecological conditions of the city and its future developm...

This paper considers the optimal regulation of access charges, and the effect such regulation has on incentives for non-price discrimination. I show that when a vertically integrated firm is able to discriminate against rivals by means of non-price measures, optimal access charges must be set higher than in the case when no discrimination is possible since the level of the access charge affects...

In this paper, a novel multi-objective bus stop location model is proposed, which considers not only the coverage of demand and minimization of access time but also the necessities of suitable stops for transit network design phase. Three objective functions are considered including minimizing (I) sum of the total access distance (time), (II) the weighted combination of stops, and (III) the num...

ion will also support better automation. Current network technologies leave too much room for human error. Some tasks, such as adding a new airline or shop, may be repeated many times and should become routine; dependencies with local implementation detail must be better hidden to make this simple and dependable. The main driver in day-to-day operations is cost. The air transport industry opera...