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- 저자 : De Leenheer, Marc (검색결과 2 건)
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ASTAS: Architecture for Scalable and Transparent Anycast Services
Stevens, Tim,De Leenheer, Marc,Develder, Chris,De Turck, Filip,Dhoedt, Bart,Demeester, Piet The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.4
Native information provider(IP) anycast suffers from routing scalability issues and the lack of stateful communication support. For this reason, we propose architecture for scalable and transparent anycast services(ASTAS), a proxy-based architecture that provides support for stateful anycast communications, while retaining the transparency offered by native anycast. Dynamic resource assignment for each initiated session guarantees that a connection is established with the most suitable target server, based on network and server conditions. Traffic engineering in the overlay can be realized in an effective way due to the dissemination of aggregated state information in the anycast overlay. To minimize the total deployment cost for ASTAS architectures, we propose optimized proxy placement and path finding heuristics based on look-ahead information gathered in network nodes. Contrary to a regular integer linear program(ILP) formulation, these heuristics allow to optimize proxy placement in large networks. A use case on a European reference network illustrates that lower proxy costs enable proxy deployment closer to the end-users, resulting in a reduced network load.
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Output Diffusion of the Monopolist over Time and Space
Hyungho Youn,Patrick De Leenheer,Victor Tremblay 한국재정학회 2015 한국재정학회 학술대회 논문집 Vol.2015 No.3
In this paper, we develop an output diffusion model in which a monopoly firm faces a cost of adjusting output over time and across geographic regions. First, we investigate a dynamic monopoly model and a simple spatial model with only regional adjustment costs. Then, we explore how the firm maximizes profits over time and space, a problem of calculus of variation. The Euler equation yields a partial differential equation, the output diffusion model. It extends the traditional inter-temporal output path into output diffusion over time and space. As long as regional adjustment costs exist, steady-state output in the diffusion model is less than the static monopoly output level. This model suggests that a policy designed to lower regional adjustment costs can increase supply in all geographic regions.
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