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 290 for “"performance degradation"”.
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INVESTIGATION OF PERFORMANCE DEGRADATION OF EVAPORATOR FOR LOW TEMPERATURE REFRIGERATION APPLICATIONS
… and operated to investigate the evaporator performance degradation for low temperature refrigeration applications. Measurements have been taken of air- and refrigerant-side temperatures, refrigerant-side pressures, air- and refrigerant-side differential pressures, air- and refrigerant-side …
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Stagnation temperature test methods for determining solar collector thermal performance degradation
… a proposed method for determining the thermal degradation of materials used in flat-plate solar collectors. The proposed method is based on measuring stagnation (no-flow) temperatures of the absorber plate. A comparison of the advantages and limitations of the proposed method is made with the …
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Investigation of performance degradation and test methods for flat-plate solar collectors
An analysis of outdoor collector performance data collected as part of the NBS Durability/Reliability Test Program is presented. The data is analyzed for consistent patterns of performance degradation resulting from prolonged outdoor exposure at low flow rate and stagnation conditions. The analysis …
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Techniques for Reliable and Efficient Analog to Digital Conversion
… capability to minimize process-variation induced performance degradation. In addition, a redundant stage is added to perform online testing and to replace a faulty stage, to enhance defect tolerance or improve yield. Simulations demonstrate that with the reconfiguration technique, a pipelined ADC …
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Benchmarking of fault-tolerant systems
… of catastrophic incidents and (2) the average performance degradation. The catastrophic incident count represents the recovery coverage of the system, while the performance degradation reflects the performance of the system in the presence of faults.
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Stability of distributed power supply systems
… power system (DPS) is performed. The possible performance degradation and stability problems caused by the loading effect of cascaded converters are analyzed. The effect of impedance overlap on the system and individual subsystems is examined. By applying the loop gain analysis technique, a …
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Computer-generated speech training versus natural speech training at various task difficulty levels
Performance degradation -- Training from natural vs. automated voice.
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Computer-generated speech training versus natural speech training at various task difficulty levels
Performance degradation -- Training from natural vs. automated voice.
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Autonomic Workload Management for Database Management Systems
… levels of business importance and distinct performance objectives. When the workloads execute concurrently on a database server, interference may occur and result in the workloads failing to meet the performance objectives and the database server suffering severe performance degradation. To …
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Matching on -Chip Data Storage to Telecommunication and Media Application Properties
… power are achieved without sacrificing code performance. When slight performance degradation can be tolerated, the compiler uses profile feedback to realize an average of 51.7% static and 9.4% dynamic power reduction.
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Fault-tolerant ring embeddings in hypercubes -- A reconfigurable approach
… the aim of minimizing reconfiguration cost and performance degradation. The cost is measured by the number of node-state changes or reconfiguration steps needed for processing of the reconfiguration, and the performance degradation is characterized as the dilation of the new embedding after …
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Robustness and Optimality in CSMA Wireless Networks
… network throughput while others suffer from poor performance. As a solution to this problem, recent theoretical studies have proposed distributed CSMA adaptation protocols that, under certain assumptions, maximize a network utility function, yielding high throughput fairly distributed among flows. …
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Video transmission over constrained bandwidth channels
… video). Such a service should provide graceful performance degradation as resources become scarce by exploiting the particular characteristics of the media type. In this thesis, we consider providing a best effort service targeted for video transmission, by multiplexing multiple video streams …
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Selective machine learning for stock market prediction
… of a wide universe of stocks, leading to performance degradation caused by significant noise. In this study, we apply two mechanisms from Selective Machine Learning and Curriculum Learning to enhance the robustness of our model to noise and improve overall performance. Additionally, we …
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Modeling and simulation of hot-carrier induced device and circuit degradation for VLSI reliability
… presented for estimating the hot-carrier induced degradation of MOSFET device characteristics and circuit performance. The proposed simulation tool provides information on (i) the evolution of device and circuit performance degradation during long-term dynamic operation, (ii) the amount of …
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Equalizers for communications satellites
… filter complexity requirements, and narrow band performance degradation. After examining various architectures, it was determined that the FIR filter was the best equalizer structure given the nature of the channel. The basic calibration procedure was also extended for use at high RF frequencies …
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Study Of Oxide Breakdown, Hot Carrier And Nbti Effects On Mos Device And Circuit Reliability
… and interface generation cause long term performance drift and related reliability problems in devices and circuits. The RF front-end circuits include low noise amplifier (LNA), local oscillator (LO) and mixer. It is desirable for a LNA to achieve high gain with low noise figure, a LO to …
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The Effect Of Hot Carrier Stress On Low Noise Amplifier Radio Frequency Performance Under Weak And Strong Inversion
This thesis work is mainly focused on studying RF performance degradation of a low noise amplifier (LNA) circuit due to hot carrier effect (HCE) in both the weak and strong inversion regions. Since the figures of merit for the RF circuit characterization are gain, noise figure, input, and output …
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Techniques for sequential circuit automatic test generation
… can be prohibitive in both area overhead and performance degradation. Therefore, an efficient sequential circuit test generation system which generates tests for all detectable faults and identifies all untestable faults in the original design is necessary. The information on untestable faults …
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Nonreciprocal microwave devices using parametric frequency conversion
This thesis endeavors to characterize the performance of nonreciprocal microwave devices enabled by parametric frequency conversion. Although such devices have been explored somewhat superficially in the 1960s, resurgent interest in low-noise nonreciprocal components has motivated new research in …
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