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 90 for “"Time variability"”.
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Microprocessor manufacturing throuhput time variability
Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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The cost of bus travel time variability
… reliability is a low level of day-to-day travel time variability (TTV). To obtain funds for reducing TTV, it is necessary to give evidence for the benefits from such improvement, but current tools for estimating the cost of TTV are insufficient. This thesis covers issues that arise when analysts …
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Physics from Time Variability of the VHE Blazar PKS 2155-304
… studied in detail some aspects of the temporal variability of the jet emission from PKS 2155-304, combining coordinated observations across the electromagnetic spectrum, from optical polarimetric measurements to X-ray and ground-based gamma-ray data. The temporal properties of the dataset …
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Space-time variability of soil salinity in irrigated vineyards of South Africa
… by a linear function, and its evolution over time. A method was proposed to reduce the number of samples necessary to determine this salt depth trend and to estimate the quality of the soil water that drains below the rooting zone. One of the important findings was that an ECe threshold for …
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Investigating objective markers of ADHD across development: Micromovements and reaction time variability
… candidate ADHD endophenotypes, intrasubject variability in reaction time (ISV RT) and infrared measures of micromovements, examining the potential of these endophenotypes in differentiating between ADHD and typically developing (TD) populations. All participants completed a diagnostic and …
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A satellite view of the space-time variability of phytoplankton biomass in the Mediterranean Sea
… datasets and techniques) the phytoplankton space time variability in the Mediterranean Sea (MED) using satellite data (SeaWiFS), at different timescales, and their relationship with the physical environment. A validation exercise was performed over SeaWiFS data in the context of the reliability of …
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Is response time variability on an exogenous visual orienting task associated with specific genetic markers?
… the contributions of genetic markers to RT variability. I consider the relationship between mean RT and RT variability and account for other potential predictors of RT variability such as age, ethnicity, and sleepiness. I ask, after accounting for other reasons that RT variability might be …
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Optimization of vehicle routing and scheduling with travel time variability - application in winter road maintenance
… scheduling, which can be used to collect travel time information, and also to perform winter road maintenance operations (e.g., salting, plowing). The objective of this research was to minimize the total vehicle travel time to complete a given set of service tasks, subject to resource constraints …
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Running time variability and resource allocation : a data-driven analysis of high-frequency bus operations
Running time variability is one of the most important factors determining service quality and operating cost of high-frequency bus transit. This research aims to improve performance analysis tools currently used in the bus transit industry, particularly for measuring running time variability and …
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Time variability of sea surface parameters in the tropical Atlantic using satellite and in situ data
… characterisation of the diurnal and other short timescale variability of the meteo-ocean variables measured in the tropical Atlantic Ocean by the PIRATA array, as well as derived air-sea heat fluxes. By combining the complementarity and mitigating the disadvantages of using the high temporal …
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Evaluation of the space-time variability of soil salinity by statistical, geostatistical and bayesian maximum entropy methods
… geostatistical methods for the analysis of space time data and their application to soil salinity. Special emphasis was put on how to characterize soil salinity. Also, the focus was on three groups of methods, i.e. statistical, geostatistical and Bayesian maximum entropy (BME) approaches. …
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Analytic Evaluation of the Expectation and Variance of Different Performance Measures of a Schedule under Processing Time Variability
… instances of uncertainties in job processing times, machine statuses (up or down), demand fluctuations, due dates of jobs and job priorities. These uncertainties stem from the inability to gather accurate information about the various parameters (e.g., processing times, product demand) or to …
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Modeling end-to-end order cycle-time variability to improve on-time delivery commitments and drive future state metrics
… to increase the percentage of orders that are ontime to a committed Estimated Delivery Date (EDD). EDDs for products vary greatly with the complexity of the customer purchase orders. In order to remain competitive, Dell has set an aggressive goal to provide better on-time delivery performance. …
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Simulation study of a kanban-controlled production system
Just-In-Time (JIT) has become one of the most popular production control philosophies in the last three decades. JIT did not find acceptance in the American companies until after the oil crisis. To be more flexible and to adapt quickly to changes in the market, many American companies took to the …
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The genetics of cognition in Schizophrenia
… measures on cognitive tasks or by measuring variability in performance across tasks or trials of a task that make up a cognitive test battery. Previous research has demonstrated that both cognitive ability and schizophrenia are highly heritable, and that there is a genetic contribution to …
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The genetics of cognition in Schizophrenia
… measures on cognitive tasks or by measuring variability in performance across tasks or trials of a task that make up a cognitive test battery. Previous research has demonstrated that both cognitive ability and schizophrenia are highly heritable, and that there is a genetic contribution to …
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Measurement of Magnetic Fields From Linear Polarization of Dust Emission
… (for e.g. Cygnus A, M87), monitoring the time variability of polarized SiO maser emission (RLeo, Orion IRc2) and studying the linear polarization of quasars.
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Sea level variability and coastal trapped waves around southern Africa
… The observed records showed sea level variability dominated by the short time variability with a period shorter than one month. This short time variability varies from season to season with the largest CTW amplitude during austral winter. The short time variability propagates …
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Intermodal variability and optimal mode selection
… mode based on freight cost and average transit time. Besides these two factors, the transit variability associated with each mode choice also impacts the transportation cost in an indirect way. In particular, higher variability of transit time will lead to a higher safety stock level in order to …
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