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.
Results
Showing 1 to 20 of 39 for “"lower layers"”.
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Providing availability in the lower layers of a wireless network: philosophies and case studies
… can disrupt the connectivity offered by the lower layers of a wireless network and interrupt the provided services; thus, network availability in the lower layers is essential both to prevent inconveniences and to reliably provide critical services. This dissertation considers three major …
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Vessel : a lightweight container for network analysis
… on the Internet from the development of lower layers. However, the abstraction hides useful low-level information from researchers and administrators who could otherwise use the insights from the performance of TCP and lower layers to diagnose problems and improve TCP performance. Though …
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Anatomical analysis of the feedback projections from extrastriate cortex to area 18 in ferret visual cortex
… have a modulatory influence on the responses of lower order neurons providing information already processed. Input from feedback connections can supposedly elicit changes in the response to stimuli within the receptive field and may be involved in the role of discriminating objects relative to …
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Performance evaluation of packet video transfer over local area networks
… of the processing is performed by the higher layers of the Open Systems Interconnection (OSI) reference model, while the lower layers provide real-time services. Implementation methods are discussed for coding schemes, including data compression, the network interface unit, and the underlying …
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Investigation of the impact of desalination on the salinity of the Persian Gulf
… in dense saline water that naturally sinks to lower layers and exits the Gulf into the Indian Ocean.
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A Transport Layer Approach to Host Mobility
… to end-to-end information not available at lower layers. Coupled with inverse multiplexing techniques and error classification algorithms, such information can be used to achieve a significant improvement in data throughput to mobile hosts. This research centers on the design of a transport …
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Balloon Borne GPS-Enabled Radiosondes That Enable Simultaneous Multi-Point Atmospheric Sensing With a Single Ground Station
… critical tool for understanding dynamics in the lower layers of the atmosphere. The low-cost radiosondes developed in the Space and Atmospheric Instrumentation Lab have been further developed to improve the system's use as a science-quality atmospheric instrument that is unique in its ability to …
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Water Quality Changes Under Ice Cover in Northern Prairie Lakes
… of dissolved impurities present in surface layers of the ice. No substantial concentrations of any ions were found in the ice of lower layers. Specific conductance increased over 40% under ice cover in two of the lakes studied. Increases in other lakes ranged from 19 to 38%. Major ions …
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Micro-macroscopic modeling and simulation of an Automated Highway System
… The focus of the system modeling is towards the lower layers of this control system architecture, involving a comprehensive modeling of the regulation and physical layers and a simple, yet realistic modeling of the functionalities of the link layer. The regulation and physical layer design …
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A delay-constrained cross-layer model using network coding
… is predicated on the assumption that the lower layers are reliable, but this comes at a high cost in terms of data rate on a band-limited, lossy wireless channel. This cost is tolerable over one underutilized link, but when the network demands high-capacity wireless links, it may be time …
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Evaluator: Cloud-Based Software for Collaborative Evaluation
… is the subject we want to evaluate, towards the lower layers it is divided into more and more simple indicators. Therefore, the evaluators are responsible for assessing the project in terms of only the most simplified indicators. As a result, a precise evaluation which is not subject to human …
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Error Control in Wireless ATM Network
… physical layer error conditions are handled in lower layers under ATM transport layer. Automatic Repeat reQuest schemes (ARQ) and Forward Error Correction (FEC) have been widely used for reliable data transmissions. However, the current existing ARQ schemes can potentially introduce unbounded …
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Getting More Out of the Existing Internet Infrastructure To Improve User Experiences
… the infrastructural inefficiencies in the lower layers of the network stack, and in the other we focus on efficient allocation of bandwidth to applications based on user preferences. With these goals in mind, this thesis attempts to answer the following questions specifically: (a) How slow …
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Broad-based side-channel defenses for modern microprocessors
… augment the compiler with information about the lower layers of the computing stack, so that the compiler is aware of potential side channels and so that the compiler can rewrite programs to avoid leaking information through those side channels. In doing so, our solutions define new abstractions …
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Protocol stacks for power-aware wireless microsensor networks
… With the integrated design framework, lower layers of the network stack provides configurable power-aware features to be controlled by higher network layers that maintain broaderview knowledge of the environment. TDMA has been chosen as a MAC Layer protocol for its inherited power-aware …
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A climatology of the coastal low in the SW Cape
… strong divergence dynamically compresses the lower layers into low level wind speed maxima on either side of the centre of the system. The Coastal Low appears to have a very complex structure, and two results from this study in the. SW Cape bear particular mention. Firstly the offshore flow at …
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Airblue : a highly-configurable FPGA-based platform for wireless network research
… are typically two to three orders of magnitude slower than commodity hardware. FPGA-based platforms provide much better speeds but are quite difficult to modify because of the way high-speed designs are typically implemented by trading modularity for performance. Experimenting with cross-layer …
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Radiative Transfer in the Martian Environment: In-Situ Results from the MSL Curiosity Rover and Laboratory Experimentation on Martian Regolith and Crystalline Rock Analogs
… suggesting little mixing between the upper and lower layers. The dust within the crater appears to be well mixed horizontally, implying that dust events (such as dust devils or lateral dust transport) in the northern plains of Gale Crater are rare, even during the most convective time of day. …
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On the Interaction of Natural Convection and Mechanical Ventilation
… at the interface between the original upper and lower layers; large decreases lead to an intrusion below the original lower layer. Increasing the buoyancy of the supply fluid leads to mixing between the supply fluid and the fluid already in the space. Small increases only mix the lower layer, but …
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Exploring the effects of an obstruction on the evolution of the Rayleigh-Taylor Instability
… the interface between an upper heavy layer and lower light layer. In the first case, a single horizontal opening connects the upper and lower layers. A bidirectional flow exchanges fluid through the opening, establishing a circulation cell in each layer. These cells exist quasi-steadily for long …
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