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Kadari, Kishore Kumar. "Electroplating on 3D Printed Conductive Track." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7412.
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There are substantial advances in Additive Manufacturing (AM) technologies. The simplest and advantageous technique of AM in terms of cost and scaling of the substrate is Fused Deposition Modeling(FDM). Currently, integration of electronics to a 3D printed structure is done manually after fabrication of the structure. To print electronic circuits directly on a 3D printed structure, copper electroplating process has been studied in this work.
To electroplate on the 3D printed insulating substrate, various materials were studied to make substrate conductive. By using conductive Polylactic Acid (PLA) filaments, a compatible substrate for electroplating was printed. Electroplating was proved to be advantageous in terms of uniform distribution as well as fast deposition rate when performed laterally. The conductive levels of the electrodeposited layers on 3D printed conductive substrates were studied at different voltages in different configurations.
Furthermore, the textures of the electroplated layer were studied using Scanning Electron Microscopy(SEM) method. The resistance of samples was measured using four-point probe resistance setup. The Morphology and roughness of the samples were studied by an optical profilometer system.
In addition, the adhesion strength of the electrodeposited copper on conductive PLA material was tested by a peel test using scotch tape. Thickness and conductivity calculations were performed for uniformly deposited samples. Further study is required for optimizing electroplating process to be used for in situ metallizations of a 3D printed structure.
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Romps, John F. (John Francis). "Modelling track maintenance and its effects on the reliability of a single track railroad line." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12397.
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Faiz, Rizwan Bin. "An empirical rail track degradation model based on predictive analysis of rail profile and track geometry." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6455.
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It is generally observed that the condition of rail tracks degrades rapidly over time until and unless effective maintenance is carried out. In the rail industry, rail maintenance actions are usually reactive, which means that maintenance is carried out after a defect has been identified. Unfortunately, this approach can lead to general safety concerns and may result in costly maintenance. Predictive maintenance, which aims to predict the future behaviour of track degradation based on the analysis of already recorded data, can be used to identify defects in advance, thus providing a solution for the above safety and cost concerns. Two important questions for which answers are sought in predictive maintenance of rail track are: where does the fault occur and when. The aim of the research presented in this thesis is to develop a novel predictive rail track degradation model that answers the above questions. The proposed model consists of an alignment component for effective alignment of data and a degradation component for understanding rail track degradation based on rail profile and track geometry parametric analysis. The thesis takes an incremental approach to data alignment proposing three different algorithms namely, distance alignment, fixed window based alignment and parameter based alignment. It is proven that the latter approach provides the most accurate data alignment algorithm. The degradation component of the proposed model is based on a comprehensive multivariate and univariate analysis. In multivariate analysis, parameters of a base file i.e. a file consisting of parameters belonging to the same segment of the rail track at a given time of measurement are predicted using all other parameters of the same file. In univariate analysis, every parameter of a given base file is predicted, temporally, from the corresponding parameters in the previous base files. Such contribution analysis manifests the level to which each parameter contributes in predicting other parameters and over time. Subsequent to univariate and iii multivariate analysis the predictive errors are thresholded into either exceedences i.e. they exceed the threshold line, needing immediate maintenance, or normal i.e. they are below the threshold line, needing no immediate maintenance. The research presented in this thesis shows that in multivariate analysis, rail profile parameters were predicted with 97% prediction accuracy below threshold, whereas track geometry parameters were predicted with 99% prediction accuracy below threshold. Both univariate and multivariate analysis will serve as the basis in monitoring track conditions and thus finding track degradation problems. This will greatly aid in planning predictive track degradation by providing an objective means of evaluating track conditions and hence the over all life of the rail track will increase.
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WILKENS, J. T. "Vehicle Track Sensing Based on Radio Tomographic Imaging." Universidade Federal do Espírito Santo, 2016. http://repositorio.ufes.br/handle/10/9672.
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Previous issue date: 2016-03-04O aumento da quantidade de veículos nas estradas faz com que engarrafamentos representam um problema global crescente. Monitoramento do tráfego é tarefa crucial para o melhoramento do fluxo de tráfego. O foco desta dissertação de Mestrado está na proposta e no desenvolvimento de uma metodologia para a estimativa em tempo real de ocupação e velocidade de um ou dois veículos em um único segmento de pista, trafegando à velocidades que variam entre 10 km/h e 50 km/h, usando uma rede de tomografia de rádio por imagem RTI (Radio Tomographic Imaging). RTI é uma tecnologia emergente e consiste de uma rede de sensores sem fio que produz imagens da mudançaa no campo eletromagnético de uma área monitorada usando potência do sinal recebido RSS (Received Signal Strength). Isso permite o rastreamento de objetos tais como pessoas e carros que não contêm dispositivos de transcepção. A proposta é a primeira a apresentar uma rede RTI que é dividida em várias sub-redes para alcançar uma frequência de varredura de rede suficientemente rápida para evitar a desfocagem nas imagens capturadas por veículos que andam a velocidades acima dos 50 km/h. Sugere-se nesta proposta um novo método de cálculo da matriz de peso, uma nova configuração de espaçamento de nó e um novo método de detecção de veículos. A principal contribuição deste trabalho é estimular a pesquisa sobre a possibilidade de usar redes RTI como sendo parte de um sistema de transporte inteligente em um ambiente de cidades inteligentes. Esta dissertação apresenta também um novo modelo de simulação relativamente completo para o sistema RTI proposto. Este modelo gera medições RSS baseado no protocolo IEEE 802.15.4 para a comunicação ZigBee, que são processadas utilizando técnicas RTI comumente utilizadas na literatura. O modelo permite a especificação de uma rede RTI a partir do zero, incluindo posições de nó, tamanho e geometria da rede, sendo que o processamento de medição de RSS pode utilizar qualquer técnica desenvolvida. Os resultados das simulações, obtidos pós a aplicação do sistema RTI proposto para o modelo de simulação validado, indicam que é possível detectar um ou dois carros populares simultaneamente. Usando técnicas que reduzem a variância do RSS devido aos efeitos múltiplos percursos, o desempenho da detecção de veículos apresentou acurácia entre 95% e 100%.
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Kuo, Pei-Hsin. "Measurement of Modulus Change with Temperature of Synthetic Track Materials." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/KuoPH2008.pdf.
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Saenz, David Pael. "Measuring College Readiness: Developing a System of On-Track and Off-Track Metrics for Texas High School Students." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707239/.
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The purpose of this study was to analyze and determine the predictive power of individual and a combination of different indicators that are used to determine college readiness. For this study a logistic regression analysis was conducted due to the dichotomous nature of the dependent variable. The dependent variable for the study was the earning of a post-secondary credential. The independent variables included high school diploma type, Advanced Placement course taken, Advanced Placement test performance, SAT performance, ACT performance, a multidimensional index made up of all the variables, and high school GPA. The study found that high school GPA had the strongest odds ratio, Exp(B), for the participants earning a post-secondary credential (Exp(B) = 6.597), followed by diploma type (Exp(B) = 6.316), taking an Advanced Placement course (Exp(B) = 4.368), earning at least one qualifying Advanced Placement test score (Exp(B) = 3.846), a multidimensional index (Exp(B) = 2.318), ACT score (Exp(B) = 1.161) and SAT score (Exp(B) = 1.003). Future analysis is needed by using live data of student's college performance, stratifying the data to account for differences in post-secondary performance by different racial and socio-economic groups, and studying the effects of the State of Texas' chosen college readiness variables.
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Powell, Raymond Brown E. R. "Predicting field performance on the NCAT pavement test track." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Dissertations/POWELL_RAYMOND_1.pdf.
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Khodary, Reda Hassan. "Influence of track shoe design on its performance characteristics." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389954.
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Svedberg, Victoria. "Towards optimal railway track utilization based on societal benefit." Licentiate thesis, Linköpings universitet, Kommunikations- och transportsystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150995.
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Infrastructure managers in railway systems are striving to have as efficient track utilization as possible. There are no unanimous interpretation of efficiency in terms of track utilization, but the aim of the Swedish Transport Administration is to allocate track capacity such that societal benefit is maximized. This means that the tracks should be used by as much traffic as possible and by traffic that provides as much benefit for the society as possible. To allocate track capacity such that the track utilization is optimal would be an easy task if the track capacity were not a scarce resource. Today, many train operators share railway network and there are cases when two or more operators want to use the same track capacity at the same time. The infrastructure manager must then make priorities and reject some operators, and the question is which operators to reject. The guiding principle is to grant the operators that provide the highest societal benefit access to the tracks. However, the question would then change into how to know which operator that provides the highest societal benefit. In this thesis, the societal benefit of publicly subsidized traffic is estimated using social cost-benefit analysis. Mathematical models and methods are developed for quantifying and computing the number of departures for the publicly subsidized traffic and their distribution in time, i.e. a train timetable, that provides the maximal societal benefit in a social cost-benefit analysis setting. The societal benefit of commercial traffic is estimated using the market value for their requested train timetables. The market value is set using dynamic pricing. A suggestion of a dynamic pricing process that can be used in the train timetabling process is described. Mathematical models and methods for calculating the supply and demand of a track access request are developed and tested, which enables the use of a dynamic pricing process on track capacity
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Olson, Ted. ""Love’s 'Forever Changes': An Essentially Timeless Album Fifty Years On" and "Love’s 'Forever Changes': The Original Album Track-by-Track"." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/1152.
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Handstanger, Anne Christine Torp. "Scheduled waiting time from crossing on single track railway lines." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5779.
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For the long term planning of railway infrastructure several analyses are necesarry. One of them is the prognosticated demand for future railway transportation. This information serves as input parameter for the capacity and benefit cost analysis. For the capacity analysis, timetable independent analytical methods that can estimate the scheduled waiting time in dependency of the number of trains running on the line is required. If the scheduled waiting time is too long, the operators risk losing customers and the infrastructure operators risk losing the operators as customers. Changes must be made in infrastructure or in train mixture to reduce the scheduled waiting time in an early planning stage. There are only a few existing models concerning scheduled waiting time. The crossing situation has hardly been investigated in studies since the main focus has been on double track lines. The scheduled waiting time as a topic so far has not been paid enough attention to since unscheduled waiting time has been the main focus. Estimating the scheduled waiting time is even important than the estimation of the unscheduled waiting time. An overbooked railway line will seldom be as successful as a balanced railway line as a transportation offer or in operation. The planner’s task is to estimate and design an infrastructure that will support the market on time in best way with regards to both scheduled and unscheduled waiting time. There is a demand to develop and to improve models for the calculation of scheduled waiting time. This thesis is an attempt to meet a part of the demand of the research within this subject. In this thesis a deterministic analysis of the crossing situation of trains on single track lines has been performed. A new model for the calculation of the number of crossings, the expected waiting time for crossing and merging has been developed on the basis of the conditions formed for incuring a crossing. This analysis states that the conditions for a train to incur a crossing is similar to the conditions given in [Schw81] for an overtaking to take place. The analytical model developed makes use of stochastics in order to estimate the expected waiting time from crossing for each train model. This ensures a timetable independent estimation. The model focuses on mixed train traffic in both directions with a strict hierarchical priority system. An exponential buffer time distribution between the requested train paths of higher priority is assumed to make it possible for trains of lower priority to merge in between the trains of higher priority. This philosophy is based on a timetable construction process where different train models are given different priority due to their trackage rights achieved. The train model with highest priority will be included into the timetable first. The expected waiting time from crossing within a train model can then be estimated. In the model deduced, one direction is chosen to take priority over the opposite direction. The prior direction can, for example, be outward traffic. This means that the trains running in the direction of lower priority risks incuring waiting time from crossing. A case study of the timetable characteristics on single track lines was carried out to investigate whether the timetables follow a cyclic or a stochatic pattern. The noncyclic timetables were further analysed by a χ2 - test of goodness of fit of the buffer time between the trains of higher priority if the buffer time distribution could be exponential, hyper-exponential or Erlang2 distributed. An asynchronous simulation tool has been used to control and evaluate the model. Random timetables were generated and served as input to the simulation tool. A dummy illustrating a railway single track line was constructed and served as the main study object. An existing train model was chosen to run the line in both directions. The number of crossings, the number of multiple crossings and the waiting times were recorded and compared with the results from the model established. The evaluation of the reliability of the model requires more research by simulation before a satisfactory statement can be fulfilled. Two different priority strategies were simulated and compared. A priority strategy with equal priority between the trains of opposite directions tend to generate more crossings than a strategy with strict priority for one direction. On the other hand a strategy with one direction priori over the opposite direction tend to generated more multiple crossings relative to the number of crossings compared to the equal priority strategy. An attempt has been made to use the same methodology for the derivation of a model for the estimation of the expected waiting time from crossing with constant buffer times between the requested train paths of higher priority. This model has some weaknesses and has therefore not been further analysed. Finally, a sensitivity analysis of the model developed illustrates that the time gap necessary for a train to reach the next station before meeting an opposing train has the most influence on the estimated result. The model is therefore probably most suited for railway lines with less variation in the occupation time between the stations.
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Stanley, Christina C. "Back on track| Evaluating the impact of the Opportunity program." Thesis, California State University, Fullerton, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3573281.
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Education leaders have turned to alternative schools and classroom settings for help as students continue to fail classes and fall behind in acquiring the required units for graduation. Alternative programs, such as Opportunity Education, help at-risk students make academic progress, recover graduation units, learn appropriate classroom behavior, reintegrate into the comprehensive high school setting, and graduate from a comprehensive high school. The purpose of this study was to evaluate the impact of participation in the Opportunity Program on student academic success. Data included graduation units recovered, graduation requirements met in the comprehensive or alternative setting, attendance rates, and length of time spent in alternative education. Findings indicate that students in the Opportunity program did not recover sufficient graduation units while enrolled but did improve daily school attendance during and after exit from the program. The majority of students enrolled in the Opportunity program did not return to the comprehensive high school setting, sustain academic progress, or graduate on time with their four-year cohort. At-risk factors continued to influence students' academic progress after intervention.
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Witt, Stephen. "The Influence of Under Sleeper Pads on Railway Track Dynamics." Thesis, Linköping University, Department of Management and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12232.
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In this work the influence of Under Sleeper Pads on the dynamic forces on a railway track is investigated. A special interest is devoted to the effect of using Under Sleeper Pads in a railway track with changing vertical stiffness. The contact force between wheel and rail and the ballast contact forces are examined. For the investigation a finite element model with the length of thirty sleepers is created and calculations are performed with the software LS-DYNA. Three different cases of varying vertical track stiffness are studied: the transition from an embankment to a bridge, a randomly varying track stiffness along the railway track and hanging sleepers.
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Yeung, Ngai-hang Ian, and 楊毅恆. "Sound on track: study of railway noise in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31254457.
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Yeung, Ngai-hang Ian. "Sound on track : study of railway noise in Hong Kong /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21301530.
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Abadi, Taufan. "Effect of sleeper and ballast interventions on rail track performance." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/388080/.
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Leiviskä, Albin. "Load generation on a CV90 track system using multibody dynamics." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187750.
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Kostov, Viktor, and Andriy Slyusar. "Development of a Track Editing System for Use with Maps on Smartphones." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-28426.
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Pritchard, Odalys G. "An Evaluation of the Effects of a Student Trajectory Enhancement Program (STEP UP) on High School Performance." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7893.
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The Student Trajectory Enhancement Program (STEP UP) was launched in 2014 by Hillsborough County Public Schools (HCPS) as a six-week summer program that targeted over-age, retained, potentially under-achieving students completing the sixth grade. The purpose of this study was to conduct a summative evaluation of the effectiveness of the STEP UP program in keeping program participants “on track” for high school graduation and to determine if the intended goals of the program were realized.
STEP UP was developed in response to compelling data that there is an unacceptably high number of overage students in middle school in HCPS. STEP UP was intended to decrease the number of potential dropouts in HCPS, with the assumption that a number of students who drop out of high school originate as overage students in the elementary and middle grades. The evaluation focused on students who participated in the initial cohort in the summer of 2014. Data analyzed were students’ attendance, behavior, course performance, and grade point averages—the district’s Key Performance Indicators (KPI’s) serving as the benchmark for determining whether students are “on track” to graduate.
Findings of the study suggested that students’ “on-track” performance on individual KPI metrics was significantly higher than the overall “on-track” performance on all Key Performance Indicators as an aggregate. Data reflected that the majority of students in the program were minority (78.74%), designated as Free/Reduced Lunch (91.27%), and classified as ESE and ELL
(54.09%). Of the variables studied (ethnicity, gender, ESE status, ELL status, and FRL status), students in poverty and students with profound exceptionalities had the lowest “on-track” performance rates. While there were differences in individual KPI performance rates among ethnic groups, there was little difference among the three largest ethnic subgroups in the data set (Hispanic, white and African-American) when analyzing “on-track” performance rates for all KPI’s together.
This study contributes to the school district’s ability to make improvements to the program. In addition, other districts might gain insights to help them determine if a similar program could prove beneficial for their overage, retained students in middle school.
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Hauke, Matthew D. "EVALUATING ATLANTIC TROPICAL CYCLONE TRACK ERROR DISTRIBUTIONS BASED ON FORECAST CONFIDENCE /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FHauke.pdf.
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Bona, Melissa Ellen. "The effect of straightening and grinding of welds on track roughness." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16180/.
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Rail is a very expensive component of the railway track. Therefore, research methods extending rail life have great economic importance. During the past thirty years and, particularly during the past ten years there has been an increasing awareness throughout most rail networks in the world of the need to introduce improved design criteria, better construction techniques and higher standard track generally. This implies that quality control at all levels is mandatory if these objectives are to be achieved. With the improved understanding of degradation of track, a more complete comprehension of the costs associated with different operating and infrastructure conditions should also be developed, aiding in the determination of efficient maintenance costs and their contribution to access charges. Track and structures together account for 60% of maintenance costs, with 50% of the total being track. The UIC has done a lot of work on comparative performance indicators, and these show what potential savings much be out there for the taking, just by adopting current best practice. The old wisdom is that it's not enough o do things rights; we have to make sure that we do the right things. These developments have largely resulted from the demand for higher speeds particularly in passenger services and the demand to accept heavier axle loads of freight traffic. Whilst the conventional railway track structure is not likely to change significantly over the next ten years there will be a requirement over that period for better quality track infrastructure. This means less rail surface defects, less internal defects and less wheels irregularities. The presence of rail surface defects generally increases the roughness of the track leading to a poor passenger ride and increased safety risk with freight traffic. In addition, rail surface defects will generally increase the degradation rate of other track components; however, not all defects will produce visible track deterioration. Dynamic impacts produced by the rollingstock running over rail surface defects, such as poor welds, will, over time, create continuous rail defects, loosening of fastenings, abrasion and skewing of sleepers, crushing of ballast and loss of formation geometry. It is only in the recent years that the importance of poor welds in track has been identified. Dips and peaks must be recognised as a severe track irregularity that needs to be addressed and removed. Current maintenance activities have little effect on removing misaligned welds in track and the improvement obtained after the maintenance works is generally short lived. On the other hand, straightening operations have proven to solve the problem and maintain the results following 7 months of traffic. As part of this project, a six kilometre test section was selected on the Mt Isa Line and all welds located in this region were monitored for over 9 months to increase the understanding of the effect of individual maintenance activities on the track roughness. Three 2km Divisions were established; each Division had different maintenance activities and levels of intervention completed over the duration of the project. Over 15,000 readings were recorded and analysed. The following conclusions were drawn. The effect of cycle tamping was clearly identified when comparing the means of weld located in Division 1, 2 to the mean of welds in Division 3. Cycle tamping showed to have a significant positive effect on the dipped welds geometry and an increase in severity of peaked welds prior to their correction. Straightening operations completed in Division 1 and 2 reduced the overall mean of weld misalignments. These Divisions were subjected to different levels of straightening intervention however they produced similar results. Division 1 all dips were straightened and Division 2 only dips >0.3mm were straightened. This means that no additional benefit, in terms of overall misalignment of welds, can be gained when straightening operations target dips with a misalignment smaller than 0.3mm. Cycle grinding proved to have little effect on the removal of both dips and peaks. In fact, due to the configuration of the grinding machine, grinding operation produced a slight worsening of the dips misalignments and only a minor improvement of peaks. Although long term monitoring of the site may show minor variations in weld geometry performance, after approximately 3.9 Mgt of traffic the mean of dipped welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening. Furthermore, the mean of peaked welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening.
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Mohd, Kamalludeen Rosemaliza. "Curriculum Track And Its Influences On Predicting High School Dropout Likelihood." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28324.
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Dropping out of school is a major concern as high school graduation credentials have been used as an important measurement tool to define post-secondary success. Numerous researchers presented a multitude of factors that predict dropouts at individual and school levels. Curriculum track choice, or high school course-taking sequence, defines studentsâ schooling career and ultimately the post-secondary path that they choose (Plank, DeLuca, & Estacion, 2008). Scholars have debated on various outcomes related to dropouts influenced by various curriculum choices, namely academic, career and technical education (CTE), dual enrollment, and general curriculum. Several argued students following academic tracks are more likely to graduate. Others claim that CTE benefits students who are at-risk and suppresses dropout likelihood (Rumberger & Sun, 2008). New vocationalism or dual enrollment has proven successful at reducing dropout rates.
This study attempted to investigate the influence of curriculum track and CTE program areas on dropout likelihood while controlling for possible individual differences. Analysis was conducted via Hierarchical Generalized Linear Modeling (HGLM) due to the nested data structure of Education Longitudinal Study of 2002 (ELS). Variables included were academic background, academic and career aspiration, school-sponsored activity participation, school minority composition, school average student socio-economic status (SES), school type (private or public), school urbanicity, CTE courses offered at the school, and demographic indicators (gender, race, and SES). Findings reflect higher dropout likelihood among general curriculum participants than academic and occupational concentrators after controlling for all possible individual differences. Dual concentrators had 0% dropout rate, and therefore comparison with other curriculum tracks was not possible via HGLM analysis. Results suggest substantial importance of academic background, post-secondary education plans, and school-sponsored activity participation in predicting dropout likelihood.
Comparing CTE program areas, Family and Consumer Sciences, Human Services, Public Services, Health and Education (Human Services area) participants were more likely to drop out than other program areas while Technology Education participants were less likely to drop out than Human Services and 2 or more CTE program area participants. Results suggest 9th grade overall GPA and school-sponsored activity participation as substantial predictors of dropout likelihood among occupational concentrators. Variability across schools was insignificant.Ph. D.
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Meyer, Steven J. "GPS Receiver Testing on the Supersonic Naval Ordnance Research Track (SNORT)." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609808.
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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, NevadaThere is an interest in using Global Positioning System (GPS) receivers to find: Time Space Position Information (TSPI), miss distances between a missile and target, and using the data real time as an independent tracking aid for range safety. Ashtech, Inc. has several standalone GPS receivers they believe can work at high g levels. This paper investigates how the Ashtech GPS receivers work under high g loading in one axis. The telemetry system used to collect data from the receivers and the reconstruction of the data will also be discussed. The test was done at SNORT (Supersonic Naval Ordnance Research Track) located at NAWS, China Lake, CA. The g level obtained was about +23 g’s with a deceleration of -15 g’s. The velocity reached was about Mach 2.0. A summary of the errors is included.
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Cuhadar, Cerag Esra Rubinstein Robert A. "Evaluating track-two diplomacy in pre-negotiation a comparative assessment of track-two initiatives on water and Jerusalem in the Israeli-Palestinian conflict /." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.
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Souza, Neto Jose Batista de Gaver Donald Paul. "Effects of non-normal outlier-prone error distribution on Kalman filter track." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School; Available from the National Technical Information Service, 1991. http://handle.dtic.mil/100.2/ADA247036.
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Hardt, Julie E. "Optimization of the competitive swimming track start based on lower limb asymmetry." University of Western Australia. School of Sport Science, Exercise and Health, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0192.
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The swimming track start is a complex motor skill that utilizes asymmetric lower limb action. The purpose of this study was to explore whether it could be optimized by applying the commonly accepted view that there are asymmetries in the function and behaviors of the lower limbs. Initially, the study aimed to examine the relationship between various measures of lower limb asymmetry and the swimmers' preferences for forward foot placement in the swimming track start. Participants underwent a 7 week training period whereby both the left foot forward (LFF) and the right foot forward (RFF) track starts were practiced. The philosophy behind this training protocol was to ensure that participants received equal practice with the preferred and non-preferred stance so that a dominant stance, if it existed, could emerge. Consequently, the relationships between the dominant track start stance and the lower limb asymmetry measures could be determined more accurately. Participants were male (N=11) and female (N=11) swimmers, aged 12-16 years, from the UWA-Uniswim National Age Squad. Kinetic and kinematic data were collected for the track start prior to and following the 7 week training intervention. The intervention was finished when a participant had completed approximately 14 dive sessions where both the LFF and RFF track starts were practiced. The performance criterion measure was time to 5 m. Despite significant differences in vertical force and velocity contributions following the intervention, time to 5 m did not improve for either the LFF or the RFF track start. Four different measures of lower limb asymmetry were collected, including footedness, the preferred track start stance, and the dominant take-off limb for the unilateral and bilateral counter-movement jump (CMJ). Sixteen of 22 participants displayed changes in their dominant track start stance. Eleven participants showed biases for one stance (6 for the LFF & 5 for the RFF), and 11 participants remained or became more symmetrical. Results indicated that the preferred track start stance was the only measure of asymmetry that was significantly related to track start performance (x2[2]= 6.71, p=.04 for pre-intervention & x2[2]=7.77, p=.02 for post-intervention). All other measures of lower limb asymmetry were shown to be unrelated to track start preference and performance. It was suggested that the 7 week training intervention did not provide a sufficient amount of time to see conclusive effects on 5 m time or to make conclusive comparisons between the dominant track start stance and measures of asymmetry. Since the preferred track start corresponded with better performance less than 50% of the time, it was suggested that swimmers and coaches experiment with different dive techniques to find the start which is most effective for them and spend more time on them during training.
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Dyrhauge, Helene. "On the right track? : DG TREN's role in EU railway policy making." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535684.
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Souza, Neto Jose Batista de. "Effects of non-normal outlier-prone error distribution on Kalman filter track." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/43756.
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This report is about the effects of non-normality on the efficiency of the Kalman filter, particularly when the distribution of measurement errors is still symmetric but the tails are extended, which means that the observations are outlier-prone. Kalman Filter.
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Yeo, Graeme James. "Monitoring railway track condition using inertial sensors on an in-service vehicle." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7531/.
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Effective maintenance of railway track is critical for the safe operation of any railway network. Efficient maintenance may also result in economic benefits for rail operators. The work in this thesis looks into how an inexpensive measurement system could be fitted to in-service railway vehicles such as commuter trains, to provide a relatively high frequency of measurement on their routes of operation, when compared to dedicated measurement vehicles. This thesis describes how a prototype inertial measurement system was designed and built, and fitted to a commuter train operating in the region south of London, UK. Inertial data is processed to provide a vertical profile of the track. A novel use of a modified Bryson-Frazier filter is used to produce vertical profile datasets which are repeatable to within 0.2 mm. Profiles calculated from multiple passes of the same areas of track are compared to show track degradation. Methods of estimating track stiffness are developed using vertical geometry data from repeated passes of the same track sections at differing speeds. Some correlation to stiffness is shown through the results, but exact measurements were not possible. Finally, two case studies are presented which show findings at a bridge approach, and through two level crossings.
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Brooks, Callen T. (Callen Theodore). "Modeling the effects of aircraft flight track variability on community noise exposure." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113722.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 119-121).
The implementation of Performance Based Navigation (PBN) routes across the National Airspace System (NAS) has caused a significant concentration of flight tracks. This flight track concentration also creates a concentration of noise impacts on the communities surrounding airports, which has led to an increase in noise complaints at many airports that have implemented these routes. In order to understand these changes in noise, and to design procedures that could help mitigate any negative effects, it is important to have modeling tools capable of capturing the noise impacts of flight track variability. This thesis develops a model for this purpose. First, twenty days of radar flight trajectory data from 2015 and 2016 at Boston Logan International Airport (KBOS) is used to quantify the observed distributions of variability in speed, altitude, and lateral track position. It is shown that altitude and speed variability have relatively small impacts on noise, but that the impacts of observed lateral variability are significant. Using this information, a physics-based model is developed to capture the noise impacts of lateral flight track variability. This tool is then used to model several example scenarios. First, the changes in noise due to pre- and post-PBN procedures are examined for KBOS Runway 33L departures. Next, a hypothetical procedure is designed to intentionally introduce lateral dispersion to KBOS Runway 33L departures. Finally, the tool is used to rapidly model noise impacts on due to both arrival and departure operations on all runways at KBOS. The model is shown to reduce computational expense by 1-2 order of magnitude relative to traditional methods. The results of these example analyses show that increased lateral dispersion causes a significant noise reduction at higher noise levels directly below the flight track at the cost of wider contours at lower noise levels. Because of this, any decision to add or remove flight track lateral dispersion has highly localized impacts that depend on the geometry of the route and the population of the surrounding area, and thus must be closely analyzed on an individual basis.
This work was sponsored by the FAA under ASCENT Center of Excellence Project 23, Cooperative Agreement 13-C-AJFE-MIT-008.
by Callen T. Brooks.
S.M.
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Thomas-Hilburn, Hale G. "Getting Back On Track: An Exploratory Qualitative Study of Former High School Dropouts." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/193376.
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Research on high school dropouts has largely focused on dropout prevention and the identification of risk factors that contribute to leaving school early. While the long-term prognosis of dropouts is often very poor, some individuals manage to change course and return for additional education later in life. In this exploratory qualitative study, five individuals who successfully returned for additional education and continued on to higher education were interviewed. Self-Determination Theory was used to analyze the data, which were examined for the decision-making processes that led to the changes in direction, and the factors that contributed most to facilitating their transitions. Overall, the participants followed similar stages of growth, and ultimately arrived at a turning point that resulted in their new directions. Several themes emerged from their stories, including the need for sufficient social capital, the significance of family and friends, the importance of taking responsibility, and overcoming previous negative experiences.
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Riabinina, Olena. "Keeping all eyes on track : visually guided navigation of ants, honeybees and bumblebees." Thesis, University of Sussex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499565.
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Insects are an established neurobiological model, in particular in the field of vision and navigation. For an insect traversing a route, the acquisition and processing of the visual information may serve an immediate goal or be remembered for a lifetime. This thesis brings together different approaches to study both short- and long-term visually-driven navigation in Hymenoptera.
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Qazizadeh, Alireza. "Development and on-Track Tests of Active Vertical Secondary Suspension for Passenger Trains." Licentiate thesis, KTH, Spårfordon, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159572.
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Tseng, You-Chen, and 曾右辰. "The Dynamic Analysis of Vehicle-Track Systems on a Curved Track." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/59121125220578921121.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
93
When a vehicle moves along a track, each wheel has not only longitudinal and vertical motion but also sliding motion. Sliding motion is influenced by factors such as the dynamic contact between wheels and tracks and the shapes of wheels and rails. The motion which makes wheels move left and right while proceeding is called “hunting”. The vertical and lateral dynamic characteristics of a moving vehicle is investigated in the thesis. First, apply Newton’s second law and finite element method to get the discretized equations of each component of the vehicle and track systems, respectively. These equations can be further combined to yield the equations of motion for the vehicle and track systems, respectively. For vehicle/track systems, the interaction between wheels and tracks is an important factor. This interactive forces include the normal contact force and tangential creep force. The normal contact force can be simulated by nonlinear Hertzian’s theory for elastic contacts. The tangential creep force can be simulated by Kalker’s linear theory. The tangential creep force calculated from Kalker’s linear theory is further modified by the heuristic theory to control its range. Finally, Newmark’s method is used to obtain the values of the dynamic responses of every component of the vehicle and track systems at each time step. The research findings indicate that the larger the friction coefficient between the wheel and track is, the larger the amplitude of the lateral contact force between the wheel and track will be. When a vehicle moves along a curve track, each component of the vehicle and track systems will have more violent changes in displacement,velocity and acceleration under the following conditions: high speeds, shorter curve radii, and improper cant angles.
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Tian, Linzhu. "Track position and track climate another look at tracking effects on students' achievement /." 1989. http://catalog.hathitrust.org/api/volumes/oclc/19992263.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1989.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 32-35).
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Hsu, Wei-Lun, and 許維倫. "Influence of long-wavelength track irregularities on the train-track-bridge dynamic response." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8c5zg3.
Full textAbstract:
博士國立臺灣大學
工程科學及海洋工程學研究所
106
The purpose of this study is to investigate the abnormal vibration of high-speed trains to improve riding comfort. Inductive reasoning of abnormal vibration could be the result of suspension failure of a train, track irregularity, abnormal bridge deflection, interaction of train track–bridge, etc. Vertical track irregularities over pre-stressed concrete bridges caused by concrete creep could be a reason to enlarge train vibration. For this reason, this study focused on the influence of long-wavelength track irregularities on the train track–bridge dynamic response. Via literature review, the influence of long-wavelength track irregularities on the train track bridge is mostly studied by theoretical analysis. Furthermore, it is rare to find the literature on this field that combines in situ measurements with theoretical analysis. For this reason, this study will investigate vibration levels of a high-speed train, track, and bridge system using 3D finite-element (FE) transient dynamic analysis, before and after adjustment of vertical track irregularities and in situ measurements. Using the chosen research method, first this study will discuss the key parameters that influence the train track–bridge interaction response by literature review. In the train system, track irregularities will enlarge train vibration at “critical wavelengths” and “resonance speed”; in the bridge system, the passing train will enlarge educe the bridge vibration level at “resonancecancelation speed.” Second, we will verify the accuracy of the explicit integration method, which is used in this study by alignments with literature results. After that, wheel–rail contact will be carried out by penalty method and using LS-DYNA to solve the whole train track–bridge equilibrium equation. Furthermore, the finite element (FE) model will also be verified by in situ system identification and dynamic measurement. Finally, the verified model will be used to carry out sensitivity analysis of track irregularity magnitude, wavelength, and train speed. In addition, this study also evaluates the study results via international standards such as riding comfort, derailment index, etc. In conclusion, this study is inductive of the influence of track “irregularity magnitude” and “irregularity wavelength” on the train, track, bridge system by both in situ measurement and 3D FE transient dynamic analysis. In addition, this study also provides suggestions for improving the “resonancecancelation speed” via theoretical analysis, and uses the above results to carry out applications, i.e., a discontinuous shimming pattern is proposed to avoid vehicle suspension resonance, monitor track situation by revenue operation train, etc. Finally, conclusions were made regarding the topics, which are worthy of further study. Hopefully, this thesis may become a basis for localization railway research and have the ability to go abroad.
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Sequeira, Inês Mariani Appelt. "Valuation methods : On!Track case study." Master's thesis, 2019. http://hdl.handle.net/10400.14/28391.
Full textAbstract:
O presente trabalho, sobre a forma de estudo de caso, tem como objetivo a quantificação do valor criado por um investimento realizado pela empresa R, num software de controlo de gestão, designado por On!Track.
O conceito de valor de mercado está presente em todas as decisões financeiras de uma empresa. Considerando que os seus gestores têm como principal objetivo a criação de valor para os seus acionistas, irão tomar decisões cujos resultados tenham um impacto positivo no seu valor de mercado.
O objetivo deste estudo de caso é aplicar os modelos de avaliação por Discount Cash Flow a um caso de investimento real e quantificar o valor criado para os acionistas. Tendo em conta as características da estrutura da empresa e os dados disponíveis, foram selecionados os seguintes modelos: free cash flow to firm (FCFF) and compressed adjusted present value (CAPV).
Após a aplicação de ambos os modelos, foi possível concluir que o investimento, no software On!Track, acrescentou valor à empresa estudada. O valor criado pelo software difere de um modelo para o outro e, pode ser quantificado em 16,616.28€ e 15,807.41€ por FCFF e CAPV, respetivamente.
Tendo em consideração o peso da dívida e do capital próprio sobre o total de capital investido, nas previsões efetuadas, foi possível observar o seu rácio, de aproximadamente 50%, se mantém estável ao longo dos anos observados. Por esta razão, sendo a estrutura de capitais estável, o modelo mais robusto para este estudo de caso é o FCFF.The following assignment takes the form of a case study with the objective of quantifying the value created by a firm’s investment in a control management software, designated On!Track. The concept of market value is present in every financial decision taken by a firm. As firm’s managers main objective is to create value for the shareholders, they will attempt to make decisions whose results will have a positive impact in the firm’s market value. This assignment’s objective is to apply the Discount Cash flow valuation method to a real investment and quantify the value created for its shareholders. Taking into account the firm’s structure and available data, the following models were selected: free cash flow to firm (FCFF) and compressed adjusted present value (CAPV). After applying both models it is concluded that investing in On!Track software adds value to the firm. The value created by the software differs from one model to the other and it can be quantified by 16,616.28€ and 15,807.41€ by FCFF and CAPV respectively. Considering the weight of debt and equity on the total invested capital, in the forecasts made, it is possible to observe that its ratio, of approximately 50%, is relatively stable for the analysed period. For this reason, having a stable capital structure, it is considered that the FCFF is more appropriate for this case study.
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Eunike, Eunike. "On Track Singapore: Many Architectures, One City." Thesis, 2013. http://hdl.handle.net/1911/71951.
Full textAbstract:
The scholarly interest is the sway singular architectures can have on the collective aesthetic of a generic city: How to exploit this capacity and better orchestrate an impact?
The obsession is with Singapore — a city Rem Koolhaas describes as “all foreground and no background,” without geometry, fabric or legible urban form that physically defines the city’s aesthetics. Singapore is necessarily a sum of its architectures, and is still waiting for a greater aesthetic to emerge from its heterogeneous collection.
The initiative: to revitalize the former Malayan rail lands, a site spanning the full width of the country. The plan follows Singapore’s recent practice: building distinct, free-style architectures on shifting sands — only this time anchored by a formless, yet permanent and straightforward high-speed axis that induces continuity and reinforces the island’s status as a singular, cohesive entity.
Only extreme differentiation, held in tension by the thinnest infrastructural line, can induce a forthright sense of direction in a capitalist city that must necessarily adopt multiple architectural solutions.
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I, Fang-Ju, and 易芳如. "Dicussion on Woman track cycling sprinter training." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99724975767435671534.
Full textAbstract:
碩士正修科技大學
休閒與運動管理所
103
In the 21st century today, sports science has improved as timepassed, the performance breakthrough human limits , from early stage of old fashioned training method to today’s quality and quantity combination trainings, Which is emphasizing more in professionalism, and specialization. Athletes must have the best performance in the limited time. Our women's short distance event has always been one of the major focus development for young athletes, Effectively improve the riding speed, would enhance the ability of the final sprint at the middle to long distance competition. This study is based on the review of the abilities, performance factors and organizing the technical and specialization trainings for Female 500 meters short distance event. Based on the methods which had been collected in this studying, the future training program can be rearrange to become more effective for athletes.
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Seladas, Carlota. "Jerónimo Martins: Jerónimo Martins back on track." Master's thesis, 2015. http://hdl.handle.net/10362/15386.
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Verstuyft, Lloyd C. "Comparison of On-Track and Not-On-Track Senior High School Students: An Assessment of Student Needs and Social Characteristics." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7905.
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The student dropout dilemma in the American educational system has remained unchanged for the past 30 years. Dropout figures show more than 6 million high school dropouts living in the United States today. The purpose of this study was to compare and analyze potential dropout variables between two groups of senior students at a local high school.
This study included 228 senior students who were identified within two groups: on-track for graduation and not-on-track for graduation based on state exit exam results. A student questionnaire and student records were used to gather data. The study included descriptive, multivariate, and analysis of variance to determine the relationship of variables between the two groups that may lead to increased probability of students belonging to either group.
Findings from the study suggested the following:
1.Not-on-track students desired more assistance from their school in educational development and planning.
2.On-track students had higher mean averages in academic scores.
3.Not-on-track students had fewer mothers, more children, and more adults living in the family home and were less represented in extracurricular activities.
4.Not-on-track students endorsed more negative responses about themselves.
Research suggests that state exit exam requirements for graduation most likely do not cause additional student dropouts; however, research shows that exit exams may be the tipping factor for many students to ultimately drop out. Thus, exit exams can possibly increase student dropouts. The not-on-track students in this study may be at their tipping point. The results from this study show on-track students have fewer dropout factors within their group and higher academic averages than students in the not-on-track group.
The following recommendations are based on the study:
1. Further research should be conducted that uses a student need's assessment instrument but includes former students who dropped out.
2. A study that concentrates on student's feelings of their school should be conducted at the middle school grade levels.
3. A study comparing responses of students versus responses of teachers could shine light on the school environment.
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Tu, Ming-yu, and 杜明育. "Study on Contactless Power Transmission for Linear Track." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95844209491791457544.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
95
The design and implementation of contactless power transmission for linear track system are presented in this paper. Based on the character of inductive power transmission without the need for power wire or metal contact of the conventional device, the design is mainly aimed at the track of specific demand to construct the inductive power transmission system. It also can acquire the sustained energy and signal transmission for the mobile apparatuses. In the system, the single-stage full-bridge is utilized to inverter with the property of ZVS, driving selectively the inductive winding of linear track consisted of five components. The energy transmission structure is chosen to verify the feasibility of coupling structure of coaxial winding. Besides, PIC16F876A is adopted to run the selective arousing system for the section winding and control the frequency conversion. As a result, it is disclosed that the system can provide the energy for the moving load with the comparative location which is commanded by the controlling signal from primary frame.
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Chen, Kai Daw, and 陳凱道. "On the Mechanical Analysis of Slab Track Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/27368630522873781540.
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Chen, Sheng-Jian, and 陳勝建. "Study on Contactless Weaving-Type Power Transmission Track." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/22404658602631563609.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
97
This thesis investigates the novel inductive coupler of contactless inductive power transmission track for moving vehicle. And the proposed coupler is a weaving-type. Because there is no wire connection for power supply, the motion of the vehicle is unrestricted. At first the different coupling structures are simulated and analyzed. Then the weaving-type inductive structure is used to build a contactless power transmission track. In order to improve the transmission efficiency, the appropriate resonant circuit is chosen and selective excitation is adopted. The primary side circuit utilizes microcontroller to achieve section excitation for employing track effectively as well as control the frequency of the system to reduce the power loss. In addition, in order to induce the sufficient power for the motor and Li-Polymer battery, the pick up is excited selectively according to the position on the track. Finally, by simulation and experiment, the contactless inductive power transmission track system is accomplished.
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Hsueh, Hsin-Yin, and 薛心茵. "Journey on the Track-A Study on Illustration and Animation Creation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60297907622240537166.
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碩士國立臺灣藝術大學
視覺傳達設計學系
97
With the change of time, vehicles on the track getting more rapid and diversified, the pace of living becomes faster, which leads to the change of our living environment. In the violent changing city, inspired by the current issues of the growing process and the distance between parents and children, the author created the story of the track. As a matter of fact, in different stages of life, the interactive patterns between parents and children are different, and the adolescent stage is the stage that the relationship between parents and children changes the most. However, with the increase of age, the relationship between parents and children would become steady. Because of the distinctiveness of the adolescent stage, the author aims at exploring the interaction between parents and children in the puberty. The story describes the adventure story of how the main character, “Mei-mei”, and the bird of protection that represents family love, “Pun-pun”, experience all kinds of happiness and sadness and grow up together. The story portraits the main character’s growth and the value of family love in different stages. The story was created by the traditional hand-drawing style, assisted by the computer graphics, and presented in the form of 2D animation. The story concept, character setting, animation creation, scene production, script setting, and animation production are all individually done by the author. Besides, the author composed and recorded the theme song by herself, presenting an integrated creation. The story is inspired by the “track”, and the author’s use of the track has two meanings: the first one is the metaphor within the system, that is, parents’ expectation and care to their children, and the internal struggle from infants to adolescents and adults; the other is the image of the age, representing the vehicles moving on the track and the change caused in the society and environment. Using the animation that represents the track, the story expects that the viewers would feel the warmth of family love and cherish the memory of the change of time.
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Chang, Yen-Yu, and 張晏瑜. "The Study of Female Track Services on Web system." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/48020764664762554116.
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碩士中原大學
電子工程研究所
97
ABSTRACT Due to changes of life styles, the women go home later and later and the crime rate as well as on increase in these years. According to Social Event Inspect Report, the crime events often happen between evening and midnight, and most of the victims are the women. Therefore, the late home female need to paid attention and protected. Recently, the positioning technologies were developed rapidly, and the cost for personal positioning service became more and more cheap. In this thesis, we proposed a real-time tracking system mainly for the night shift women, which combine the GPS positioning technology and Web service to offer an integrated tracking and monitoring service. First of all, the study focus on how to combine the GPS to mobile service on track of the night shift women and then provide the immediate tracking service and region-aware alert by short message service (SMS). We also build a web platform which let user to register, download software, and get the real-time tracking service.
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Chang, Shih-hua, and 張詩華. "Preference Elicitation on WWW: An Improved Track Analysis Method." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/15520638292806878907.
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碩士國立中正大學
資訊管理學系
87
Abstract The rapid growth of World Wide Web and Internet has brightened the prospective of Internet commerce. Many companies have devoted considerable resources to their own homepages to promote products and services. Since the visitors of a web site are also potential customers of the products and services provided by the company, understanding the preference of web surfers will provide useful inference to the propensity of potential customers. In “ Track Analysis Method ” (Hwai-En Han, 1997), the author utilized the log files of a web server and analyzed the “traces” left behind by a web surfer. By analyzing the “traces”, the preference of the web surfer can be elicited. The preference elicitation framework was validated in a laboratory experiment setting where the subjects’ stated preferences were derived from questionnaire and the Analytical Hierarchy Process (AHP). This research re-validated the “Track Analysis Method” on the Internet and used Multinomial Logit Model (MNL) to analyze browsing data. By using MNL, the subjects’ preferences can be revealed by using a simple question instead of a complicated AHP table.
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Tzu-FanChiang and 蔣子凡. "Influences of railway ballast resistance on track buckling temperature." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d33qnp.
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碩士國立成功大學
土木工程學系
105
In order to provide better service for passengers, Continuously Welded Rail (CWR) has been used in the railway industry. However, rails can’t stretch with the change of temperature, stress accumulation will cause buckling and tension crack. The study found that lateral resistance impact buckling temperature a lot. Therefore, setting up a model of predict buckling temperature and lateral resistance. Further, the best way to increase buckling temperature and lateral resistance is accumulating ballast. Moreover, heaping on shoulder is the most effective.
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Fawzia, Meuthia, and 穆西亞. "Smart Surveillance System with Movable Cameras on the Track." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2hbe9m.
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碩士國立交通大學
電機資訊國際學程
105
Surveillance system is widely used for many purposes, such as: hall, office, factory and school. Nowadays most surveillance systems provide network function, thus the operator is able to monitor the target/situation of interested area remotely. However, most cameras are deployed at a fixed position, for example, ceiling or wall. In order to reach full coverage or capture all target objects in the environment, we have to deploy many cameras to achieve it, which leads to high cost. Nevertheless, most cameras are not in use because of no events occur, the video data is redundancy. If we can capture the key video when new events occur, the video data is significant. The goal can be reached by combining camera with moving ability, ex: camera slide track, camera on robot or drone. In this thesis, we propose a smart surveillance system with movable cameras to capture the key video based on camera slide track. From simulation results, most events can be captured in time and keep high coverage ratio. We also implement a prototype to demonstrate the performance. Via the prototype, we show that the smart surveillance system has the ability to provide reliable surveillance.
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蘇冠丞. "Environmental Vibration induced by Moving Loads on Railway Track." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xz5vw6.
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碩士國立宜蘭大學
土木工程學系碩士班
106
The purpose of the research is to know the steady-state displacements and stresses of elastic half-space generated which caused by moving load with constant speed. We Used 3D-Fourier transform to solve wave equation. The solution requested is frequency domain of the steady-state displacements and stresses of elastic half-space generated, to present Fourier integral of wavenumbers. Due to the Fourier integral can not solve the analytic solution, we have to process integral though proper Numerical method. The method of this research is Romberg tree integral method (RTI), and using inverse fast Fourier integral to time domain responses. On the other hand, we have used Numerical result to simulate the steady-state displacements and stresses of nearby building caused by a moving train whit constant speed, and use ETABS 9 Structural Software for Building Analysis, inputting the time-history response and check if the results meets the recommended standard vibration values.