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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Use Geospatial Web Service to Access Geospatial Data Base on Web2.0

Wu, Tsung-Han 16 August 2007 (has links)
Due to rapid development of the internet, it changes the life style of the human. The internet expert had reported that we are now in Web2.0 era. This research tries to explore how web GIS can fullfil the spirit of the Web2.0 and its possible applications. The first step of the research is to review the related techniques and applications of Geospatial web services and Web2.0. Then, a system with open GIS data structure was proposed and a web system was also established according to the spirit of Web2.0 - ¡§user participation¡¨. Web Map Services (WMS) and Web Feature Services (WFS) defined by Open Geospatial Consortium(OGC) were used in Geospatial web services system to search and view Geospatial data on the internet. Users can integrate spatial data from various sources on the internet and their own geospatial data and save as Web Map Context (WMC) file format. Then, WMC can be exchanged by other OGC Geospatial web services. In addition, the system supports file format transformation from WMC to KML, which is compatible with Google Earth. So users can use Google Earth to view the spatial layer information more easily. This study also developed a platform to demonstrate geospatial information in the blog, so users can share their Geospatial data in open GIS format with other bloggers. The system also use Google Map API and folksonomy in the data sharing process in order to speed up the web flow and to communicate their comments more easily.
2

Draining your Brain: The Effects of Four Fatiguing Task Domains on Executive Function and Prefrontal Cortex

Mouloua, Salim A 01 January 2019 (has links)
The present study empirically examined the effects of four fatiguing task domains on executive function through participants' reaction time, accuracy, and brain activity in prefrontal cortex (PFC). Forty college-age participants were collected (16 males and 24 females), of which eleven were examined using a functional near-infrared spectroscopy (fNIRS) imaging system. The present study used a 4×2 mixed factorial design consisting of fatiguing task (arm contractions task, vigilance task, distance-manipulated Fitts' task, size-manipulated Fitts' task) as a between-participant variable and n-back testing period (pre-test versus post-test 3-back task) as a within-participant variable. Results indicated significant increases in 3-back performance after the fatiguing tasks, and significant increases in 3-back compensatory brain activity in dorsomedial and dorsolateral prefrontal cortex (dmPFC and dlPFC) after the fatiguing tasks. Furthermore, results showed an interaction between 3-back target type and fatiguing task on standardized changes in reaction time, and an interaction between fatiguing task and testing period on brain activity in dmPFC. Theoretical and practical implications are discussed. Findings from this study may be used to help draw the boundaries on different domains of fatigue and their effects on the brain and body.
3

Representing sounds and spellings : Phonological decline and compensatory working memory in acquired hearing impairment / Representationer av ljud och stavning : Försämrad fonologisk förmåga och kompensatoriskt arbetsminne vid förvärvad hörselnedsättning

Classon, Elisabet January 2013 (has links)
This thesis examined phonological processing in adults with postlingually acquired moderate-to-severe hearing impairment (HI) and whether explicit working memory processing of phonology and individual working memory capacity (WMC) can compensate for degraded phonological representations in this group (papers I-III). A second aim was to provide reference data for a test of WMC, the reading span test, and to examine the relation between reading span test performance and speech recognition in noise in a larger sample of 50-89 year olds with HI (paper IV). Non-auditory tasks of phonological processing, episodic long-term memory and WMC were used in papers I-III, and both behavioral and electrophysiological measures were collected. Results showed that phonological processing was impaired in the group with HI but that WMC and explicit working memory processing of phonology could be employed to compensate for degraded phonological representations. However, this compensation may come at the cost of interfering with episodic memory encoding. An  electrophysiological marker of HI in text-based rhyme judgments was found. Paper IV presented reference data for reading span test performance in two versions of the test in individuals with HI, and results suggesting that WMC may be differentially predictive of speech recognition in noise in different age groups of older adults with HI. The clinical implications of the present results concerns the double disadvantage of individuals with lower WMC and HI. A structured assessment of WMC in rehabilitative settings would help to identify these individuals and tailor treatment to their needs. The reading span test is suggested as a suitable future candidate for clinical WMC assessment. / I denna avhandling undersöktes fonologiska processer hos personer med postlingualt förvärvad, måttlig till mycket grav hörselnedsättning (HNS) och om inkoppling av explicit bearbetning av fonologi eller individuell arbetsminneskapacitet kan kompensera för försämrade ljudminnen i denna grupp (studie I-III). Ett andra syfte var att sammanställa referensdata för ett test av arbetsminneskapacitet, lässpann, och undersöka relationen mellan prestation på lässpann ochigenkänning av tal-i-brus i en större grupp av 50-89 åriga personer  med HNS (studie IV). Icke-auditiva test av fonologisk förmåga, episodiskt långtidsminne och arbetsminneskapacitet användes i studie I-III och både beteendedata och elektrofysiologiska data samlades in. Resultaten visade på försämrad fonologisk förmåga i gruppen med HNS men också att explicit bearbetning av fonologi och arbetsminneskapacitet kunde användas för att kompensera för försämrade fonologiska representationer i denna grupp. Denna kompensation kan dock ske på bekostnad av att inkodning i episodiska långtidsminnet störs. Vidare identifierades en elektrofysiologisk markör för HNS i en textbaserad rimuppgift. I studie IV presenterades referensdata i två versioner av lässpanntestet för personer med mild till mycket grav HN och resultat som pekar mot möjliga skillnader mellan olika åldersgrupper i hur väl arbetsminneskapacitet predicerar igenkänning av tal-i-brus. Kliniska implikationer rör den dubbla belastning det innebär att ha både en HN och relativt sänkt arbetsminneskapacitet. En strukturerad bedömning av arbetsminneskapacitet i samband med rehabilitering skulle kunna bidra till att synliggöra dessa personer och anpassa insatser efter deras behov. Lässpanntestet är ett test som i framtiden skulle kunna vara användbart i det sammanhanget.
4

Comparison of model checking and simulation to examine aircraft system behavior

Gelman, Gabriel E. 15 July 2013 (has links)
Automation surprises are examples of poor Human-Machine Interaction (HMI) where pilots were surprised by actions of the automation, which lead to dangerous situations during which pilots had to counteract the autopilot. To be able to identify problems that may arise between pilots and automation before implementation, methods are needed that can uncover potentially dangerous HMI early in the design process. In this work, two such methods, simulation and model checking, have been combined and compared to leverage the benefits of both. In the past, model checking has been successful at uncovering known automation surprises. Simulation, on the other hand, has been successful in the aviation domain and human factor issues. To be able to compare these two approaches, this work focused on a common case study involving a known automation surprise. The automation surprise that was examined, is linked to the former Airbus speed protection logic that caused aircraft on approach to change the flight mode, resulting in a sudden climb. The results provided by the model checking with SAL (Symbolic Analysis Laboratory) in a previous work, have been used to provide input for simulation. In this work, this automation surprise was simulated with the simulation platform WMC (Work Models that Compute) and compared to the corresponding results from SAL. By using the case study, this work provides a method to examine system behavior, such as automation surprises, using model checking and simulation in conjunction to leverage the benefits of both.
5

Psychometric Properties of a Working Memory Span Task

Alzate Vanegas, Juan M 01 January 2018 (has links)
The intent of this thesis is to examine the psychometric properties of a complex span task (CST) developed to measure working memory capacity (WMC) using measurements obtained from a sample of 68 undergraduate students at the University of Central Florida. The Grocery List Task (GLT) promises several design improvements over traditional CSTs in a prior study about individual differences in WMC and distraction effects on driving performance, and it offers potential benefits for studying WMC as well as the serial-position effect. Currently, the working memory system is composed of domain-general memorial storage processes and information-processing, which involves the use of executive functions. Prior research has found WMC to be associated with attentional measures (i.e., executive attention) and the updating function, and unrelated to the shifting function. The present study replicates these relationships to other latent variables in measures obtained from the GLT as convergent and discriminant evidence of validity. In addition, GLT measures correlate strongly with established measures of WMC. Task reliability is assessed by estimates of internal consistency, pairwise comparisons with a cross-validation sample, and an analysis of demographic effects on task measurements.
6

A computational approach to situation awareness and mental models in aviation

Mamessier, Sebastien 20 September 2013 (has links)
Although most modern, highly-computerized flight decks are known to be robust to small disturbances and failures, humans still play a crucial role in advanced decision making in off-nominal situations, and accidents still occur because of poor human-automation interaction. In addition to the physical state of the environment, operators now have to extend their awareness to the state of the automated flight systems. To guarantee the accuracy of this knowledge, humans need to know the dynamics or approximate versions of the dynamics that rule the automation. The operator's situation awareness can decline because of a deficient mental model of the aircraft and an excessive workload. This work describes the creation of a computational human agent model simulating cognitive constructs such as situation awareness and mental models known to capture the symptoms of poor human-automation interaction and provide insight into more comprehensive metrics supporting the validation of automated systems in aviation.
7

FLERVÅNINGSHUS MED TRÄSTOMME : En undersökning av utformningsprocessen för detaljlösningar i trä

Lundberg, Albin, Forsberg, Pontus January 2019 (has links)
Multi-story wood frame construction is a highly relevant topic today because of the need to continue to develop the relatively new building technique to create a sustainable way to keep constructing new buildings. Because the use of wood as a frame material in multi-story buildings is still new, there are still issues that come with the choice to use it. One of these issues is in the detailed technical solutions that are constructed, they often have faults that may lead to problems with moisture. The purpose of this degree project is to investigate these problems and more importantly the process behind constructing them. This work is also examining what can be done to counteract or minimize the issues in the planning phases of the construction as well as look at why it is important to continue developing wood construction. There are two parts of the method used in this degree project. The first part is a literature study which brings up the attributes of wood, factors for using and not using wood, the techniques used to build multi-story buildings in wood, as well as a look into the detailed technical solutions that are used and the planning process behind them. The second part is the interview study where experts in the field are interviewed to get answers about the issues that this work brings up. The interviews provided a lot of information that is relevant for this work and the result consists of the most important answers from them. The biggest factor for continuing to develop the use of wood as a frame material, from the interviews, was about the eco-friendliness of the material. The attitude to use wood in multi-story buildings varies quite a bit depending on which part of the construction sector is asked. The developers are curious but still a bit worried, because of this they have not yet taken the next step in using it more. The entrepreneurs are still sceptical about the use in multi-story constructions and there is not enough knowledge about it for them to earn the same amounts of money as if they were to use concrete or steel. Because of that they are also worried about taking the next step towards using wood more. The consultants, like the architects and construction engineers, are more positive to the use of wood and are inclined to use it more and more. The issues that come up the most are different types of attachments of balconies and exterior corridors, parts that are installed too close to the ground and solutions where the end grain of the wood is in water. There were three main problems that came up repeatedly. The biggest one was the lack of knowledge in the planning and the production phases. The second one was about how there is often no one who looks at the bigger picture in the projects which entails mistakes that could be caught. The last issue was in the installation where the construction workers might not do it according to the construction drawings or a lack of drawings which leads to improvisation at the construction site. Recommended improvements could be a standardisation of the solutions that are proven to work for everyone to use. There is also a need for better communication which provides feedback to the designers of the solutions, that way they will know what to do better in the future. More relevant education within the topic and better coordination will also prove vital in the continued development of multistory wooden constructions.

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