Agile earth observing satellite (AEOS), the new generation of earth observing satellite, is mobile along three axes (roll, pitch and yaw). This mobility increases not only the efficiency of the whole system, but also ...
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NASA researchers are developing surface optimization algorithms and a concept of operations for an airport surface traffic management tool called Spot And Runway Departure Advisor (SARDA). As part of this research, th...
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ISBN:
(数字)9781624102257
ISBN:
(纸本)9781624102257
NASA researchers are developing surface optimization algorithms and a concept of operations for an airport surface traffic management tool called Spot And Runway Departure Advisor (SARDA). As part of this research, the SARDA scheduling algorithms have been adapted to work at several capacity-constrained airports. Adapting the SARDA scheduling algorithms to airports with dissimilar geometries and operational characteristics requires a careful study of the trade-offs between competing optimization objectives and conflicting constraints. This paper presents three trade-off studies, which were performed using a fast-time simulation of the Charlotte Douglas International airport (CLT). The first study explores a trade-off between minimizing system-wide delay and allocating delay equitably among flights. The equitable delay allocation objective was achieved through a simple scheduler formulation modification. The second study focuses on a tradeoff between minimizing system-wide delay and employing an aggressive gate holding strategy. The scheduler's gate holding strategy was managed by adding a new departure queue duration scheduling parameter to control how long departures are allowed to wait in the runway queue. The third study explores the effectiveness of controlling how aircraft merge together in the ramp area in order to achieve a departure sequence which maximizes throughput. This study was motivated by CLT's distinctive airport geometry, which forces departures to merge together in the ramp area to form departure sequences prior to reaching the runway. The paper describes and summarizes the results of these three studies.
The IEEE 802.16 standard, which includes specification for the Medium Access Control (MAC) and Physical (PHY) layers, was designed to handle the requirements of different contemporary applications with diverse QoS req...
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scheduling is one of the research issue in cloud computing. It affects the performance of the cloud. To provision cloud resources to the users or to run cloud applications efficiently underlying infrastructure of the ...
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Efficient task scheduling is crucial in the domain of cloud computing. Cloud computing is a service that allows users to access and share virtual resources as needed in order to fulfil their jobs. The primary objectiv...
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Smart Environment aims to improve humans' quality of life. IoT is an emerging paradigm that makes the environment smart by using sensing technologies in IoT devices and cloud computing technology. Various surveys ...
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Deficit Round Robin (DRR) is a scheduling algorithm which provides fair queuing at O(1) complexity. However, due to its round robin structure, its latency properties are not adequate for latency-critical applications,...
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ISBN:
(纸本)1595935045
Deficit Round Robin (DRR) is a scheduling algorithm which provides fair queuing at O(1) complexity. However, due to its round robin structure, its latency properties are not adequate for latency-critical applications, such as voice. For this reason, router manufacturers implement variants of the DRR algorithm which guarantee lower latencies to one (or a subset of) queue(s). In this paper we evaluate the performance of two such variants, both of which are known as Modified Deficit Round Robin, currently implemented in commercial routers. The comparison is carried out analytically, by deriving the latency and bandwidth sharing properties of both algorithms, and by simulation. Copyright 2006 ACM.
Dynamic scheduling has been always a challenging problem for real-time distributed systems. EDF (Earliest Deadline First) algorithm has been proved to be optimal scheduling algorithm for single processor real-time sys...
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In this article, we are discussing various aspects of CPU scheduling. We first introduce the concept of CPU scheduling, different types of schedulers and the typical terminology used in relation to processes. Scheduli...
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scheduling algorithm is a hot research topic of real-time system. The quality of real-time scheduling algorithm has a direct impact on real-time system's throughput capacity, response time, even on tasks' sche...
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