Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"preemption"”.
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Special Operations Forces: From Reaction to Preemption
… to an act of war and enabled a doctrine of preemption. This change has profound implications for the Special Operations Command (SOCOM), which is tasked as the lead military agency in the Global War on Terrorism (GWOT). Global deployments of SOF reflect a strategy aimed at both working with …
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Towards power of preemption on parallel machines
… In this thesis, we focus on one of the notion of preemption, a foundational concept in scheduling, which defines the ability to interrupt the processing of a job and resuming it at a later time, or in the case of multiple processors, on a different machine. Preemptive scheduling is limited to the …
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Real-time system design using preemption thresholds
… an environment forms the scope of this thesis. Preemption threshold is introduced to control undesirable preemptions. Via a novel application of this concept, this thesis proposes a general scheduling model that subsumes both preemptive and non-preemptive scheduling models as special cases. The …
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Traffic Adaptive Offset-Based Preemption for Emergency Vehicles
… analyzed and evaluated a new strategy for preemption of emergency vehicles along a corridor, which is route-based and adaptive to real-time traffic conditions. The method uses dynamic offsets which are adjusted using congestion levels to provide uninterrupted preempted green signal for the …
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Real-Time GPU Scheduling with Preemption Support for Autonomous Mobile Robots
The use of graphical processing units (GPUs) for autonomous robots has grown recently due to their efficiency and suitability for data intensive computation. However, the current embedded GPU platforms may lack sufficient real-time capabilities for safety-critical autonomous systems. The GPU driver …
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Methodology to Assess Traffic Signal Transition Strategies Employed to Exit Preemption Control
… strategy is the most effective to exit from preemption control and transition back to the traffic signals normal timing plan. Common among these traffic signal transition strategies is the method of either increasing or decreasing the cycle length of the signal timing plan, as the process …
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A Macroscopic Model for Evaluating the Impact of Emergency Vehicle Signla Preemption on Traffic
… past, the study of Emergency Vehicle (EV) signal preemption has been mostly done using field studies. None of the simulation models that are currently commercially available have the capability to model the presence of EVs and simulate the traffic dynamics of the vehicles surrounding them. This …
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Investment Strategies under Uncertainty: Theory and evidence of preemption in case of geographical market entrance
… the stronger firm to enter the market at his preemption point and as a consequence the rent equalisation between the firms does not occur. However, it is also shown that the critical level of asymmetry is mitigated or strengthened by common economic factors such as the host market profit …
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Localities and their natural gas : stories of problem diffusion, state preemption, and local government capacity
… choosing different policy options, though state preemption is still not preventing localities from regulating oil and gas. Second, in the process of regulating drilling, local governments are undergoing what I call "problem diffusion." Rather than participating in policy diffusion, in which …
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Towards the Development of a Decision Support System for Emergency Vehicle Preemption and Transit Signal Priority Investment Planning
… capable of integrating emergency vehicle preemption and transit priority operations. However, investment planning for such an integrated system is not a trivial task. Investment planning for such a system requires a holistic approach that considers institutional, technical and financial …
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Assessing the Performance of an Emergency Vehicle Preemption System: A Case Study on U.S. 1 in Fairfax County, Virginia
… have been deployed to provide emergency vehicle preemption (EVP) at signalized intersections. Industry and transportation researchers have worked to develop analytical methods to establish the degree of benefit of emergency vehicle preemption to the emergency vehicle (EV) community and the impact …
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A Framework and Analytical Methods for Evaluation of Preferential Treatment for Emergency and Transit Vehicles at Signalized Intersections
Preferential treatments are employed to provide preemption for emergency vehicles (EV) and conditional priority for transit vehicles at signalized intersections. EV preemption employs technologies and signal control strategies seeking to reduce emergency vehicle crash potential and response times. …
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Analysis of the characteristics of emergency vehicle operations in the Washington D.C. Region
… have led to the implementation of signal preemption systems to facilitate the efficient and safe movement of emergency vehicles. However, to date only limited research has been carried out on the travel characteristics of emergency vehicles. This paper presents an analysis of emergency …
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Improving Routing Efficiency, Fairness, Differentiated Servises And Throughput In Optical Networks
… the fairness of OBS networks based on burst preemption is presented. The scheme uses carefully designed constraints to avoid excessive wasted channel reservations, reduce cascaded useless preemptions, and maintain healthy throughput levels. A new scheme to improve the throughput of OBS …
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Using the Macroscopic Fundamental Diagram to Characterize the Traffic Flow in Urban Network
… improved. In this thesis, the emergency vehicle preemption (EVP) operation is also evaluated by using the MFDs. The concept of MFD can help to illustrate the effect on various types of roads due to EVP operation. The results show that the volume of links along the emergency route is increased and …
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Utilizing High Resolution Data to Identify Minimum Vehicle Emissions Cases Considering Platoons and EVP
… GPS-based and similar priority systems by giving preemption through signalized intersections. Two flowcharts are developed to consider presence of emergency vehicle (EV) in the system so called EV life cycle and EV preemption (EVP). Three scenarios are implemented, namely base case scenario when …
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Two concrete problems in timing analysis of embedded software
… delay in the execution time of the task due to preemption by a higher priority task. Such delays are called as cache related preemption delay (CRPD). It is important to derive an upper bound on the CRPD for the schedulability analysis of tasks running in a real-time system. In this thesis we …
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Aperiodic Job Handling in Cache-Based Real-Time Systems
… take into account, the indirect cache-related preemption delays that the execution of aperiodic jobs might impose on the lower-priority sporadic tasks, thus jeopardizing their safety. To solve this problem, we propose an enhancement to the aperiodic server that we call a Cache Delay Server. …
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Optimizing Traffic Network Signals Around Railroad Crossings
… in SOURCAO is to intelligently choose a proper preemption phase sequence to promote HRGC safety. An inference engine is designed in place of traditional traffic signal preemption calls to prevent the queue from backing onto HRGC. The potential hazard is dynamically examined as to whether any …
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Fast bug finding in lock-free data structures with CB-DPOR
… performs similar to the concurrently developed preemption-bounded BPOR algorithm. CODEX is a tool for finding bugs in lock-free data structures. CODEX implements CBDPOR and this thesis demonstrates how to use CODEX to find bugs. This thesis describes new bugs in open-source lock-free data …
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