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Analysis of a class of distributed queues with application
Recently we have developed a class of media access control algorithms for different types of Local Area Networks. A common feature of these LAN algorithms is that they represent various strategies by which the processors in the LAN can simulate the availability of a centralized packet transport facility, but whose service incorporates a particular type of change over time known as 'moving sever' overhead. First we describe the operation of moving server systems in general, for both First-Come - First-Served and Head-of-the-Line orders of service, together with an approach for their delay analysis in which we transform the moving server queueing system into a conventional queueing system having proportional waiting times. Then we describe how the various LAN algorithms may be obtained from the ideal moving server system, and how a significant component of their performance characteristics is determined by the performance characteristics of that ideal system. Finally, we evaluate the compatibility of such LAN algorithms with separable queueing network models of distributed systems by computing the interdeparture time distribution for M/M/1 in the presence of moving server overhead. Although it is not exponential, except in the limits of low server utilization or low overhead, the interdeparture time distribution is a weighted sum of exponential terms with a coefficient of variation not much smaller than unity. Thus, we conjecture that a service centre with moving server overhead could be used to represent one of these LAN algorithms in a product form queueing network model of a distributed system without introducing significant approximation errors
Planning and managing water resources at the river-basin level: emergence and evolution of a concept
River basin development / Legislation / Environmental effects / Water resource management / Watersheds
Elements for a political ecology of river basins development: The case of the Chao Phraya River Basin, Thailand
River basin developmentHistory
Development trajectories of river basins: a conceptual framework
River basin development / Water use / Water demand / Water supply / Water scarcity / Water allocation / Water conservation / Farm ponds / Tanks / Reservoirs / Irrigation management / Water use efficiency / Aquifers / Pumping
Why enough is never enough: The societal determinants of river basin âoverbuildingâ
River basin developmentWater scarcityWater rights
Irrigation and water policies in the Mekong region: current discourses and practices
Water resource management / Water policy / Water law / Participatory management / Irrigation management / River basins / Governance / South East Asia / Thailand / Cambodia / Laos / Vietnam / Myanmar / China / Mekong Region
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