To see the other types of publications on this topic, follow the link: GPRS modul.
Dissertations / Theses on the topic 'GPRS modul'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'GPRS modul.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Pál, Tamás. "Nízkoenergetický GSM/GPRS modul pro senzorické aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220607.
Full textAbstract:
This project deals with the problematics of self-powered universal GSM/GPRS module which is used for sensorical applications. The first part analyzes features of mobile networks and applying energy from the environment. The second section expalins the various parts and characteristic of their associated components together with some fundamental functions of the technology for possible realization of sensoric module. The third part describes plan for system realisation and fourth parth illustrates achiaved results.
2
Famfulík, Lukáš. "Modul pro sledování mobilních objektů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219329.
Full textAbstract:
The aim of this thesis is to innovate NCL 07 unit made by NAM system a.s. The new device is intended to have improved parameters and diminished dimensions. It should be fully comparable to similar products on market. In the first part there are described features and individual circuits of NCL07 unit. Further there is done an analysis to suggest modifications leading to reduce proportions of DPS and to enhance other parameters including SW design improvement. Theoretical part deals with selection of main measured values and methods of verification of measurement accuracy. There is also described theoretical basis used in the oncoming sections of the thesis. In the practical part there are presented procedures of designs of innovated product. In the conclusion there will be made testing of new unit and results will be compared to competitive commodities.
3
Sedláček, Petr. "Hybridní modul pro průmyslovou lokalizaci." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242196.
Full textAbstract:
Tato diplomová práce si klade za cíl návrh hybridního lokalizačního zařízení, které je schopno lokalizace uvnitř i vně budov. Lokalizace uvnitř budov je dosažena pomocí technologie Ultra Wideband a venkovní lokalizace je provedena pomocí kombinace technologie RTK GNSS a PPP pomocí open - source softwaru zvaného RTKLIB. První část textu se zaměřuje na vysvětlení používaných technologií a výběr nejpřesnější technologie pro venkovní lokalizaci. Druhá část se zaměřuje ma vývoj potřebného hardware a software finálního zařízení a na integraci systému pro venkovní lokalizaci do systému pro lokalizaci vnitřní. Výstupem práce je plně funkční zařízení, které je schopné plynulé lokalizace uvnitř i vně budov. Funčnost celého zařízení je dokázána na finálních testech uskutečněných ve vnitřních i venkovních prostorách. Na závěr také práce zmiňuje možná vylepšení celého zařízení, která mohou být v budoucnu provedena.
4
Prečan, David. "Komunikační zařízení přes GSM/GPRS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218345.
Full textAbstract:
This master thesis deals with a data remote transmission by means of SMS and GPRS technology. The overview of current solutions is presented and then a remote temperature measurement and a data transmission employing a communication module GSM/GPRS TM1 through GSM network using GPRS technology is described. As a response to an impulse, the communication module sends SMS. The technical solution is described in details including HW and SW design of the data transfer and processing equipment using a ATmega 162 microprocessor. This equipment communicates with a server (PC), which displays the measured temperature. A prototype which was used for a validation of the design is also described.
5
Pietrowicz, Daniel. "Návrh vhodných HW a SW komponent pro dálkový přenos dat." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442864.
Full textAbstract:
This thesis is focused on the design of remote data transmission equipment, without access to mains power. The device will measure the voltage of the gas pipeline and send this information to the operator for processing. Analysis of today's technologies for long-distance transmission and based on the selected technology, the device will be designed. According to selected components, its power supply will be designed with the aim of long-term functionality and continuous operation.
6
Rusinský, Jan. "Použití GPRS modulu pro přenos JPG souborů v reálném čase." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218336.
Full textAbstract:
This document describes a design procedure of interface between VGA camera and GSM/GPRS modem for displaying JPEG pictures captured by camera on website. Interface is realized by eight-bit micricontroller ATMEL with application written in C language. For picture transfer to server a TCP/IP stack is implemented into modem. The document is divided into two main parts. The first part describes architecture of the system, used components (camera, modem, microcontroller) and electronic circuit design. The second part of the document is focused on the software for the system. Firstly operating system of modem is desribed, OpenAT development environment for modem application design and WIPsoft library, which is used to implement TCP/IP stack. Next is described application for microcontroller which controlls camera and modem. Last part of this document describes server application and web interface.
7
Žák, Tomáš. "Telemetrie pro RC modely letadel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221147.
Full textAbstract:
Master‘s thesis is focused on problematic about state of RC plane model during the flight. Device is able to measure overload, height, position, pressure and velocity of the flight and store this measurement data to memory medium. The main aim of the master‘s thesis was to design a functional board, firmware for device and design simple program for evaluating of measured data. Involvement consists of five basic parts. First part is microcontroller, which processes measurement data and communicate with others parts. Next is accelerometer. Accelerometer is used for scanning overload of the plane. Barometer is used for measurement of height and pressure. For measuring position and velocity is used GPS module. Last part is memory medium. MicroSD is used as memory medium for storing measurement data. Evaluation of measured data is realized as simple program with base graphical user interface. Program was created in Matlab.
8
Ribeiro, Marcelle Dorneles. "Tecnologia GPS em pesquisa de origem e destino." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/101182.
Full textAbstract:
As pesquisas de origem e destino (Pesquisas O/D) são tradicionalmente realizadas a partir do relato dos participantes de todas as viagens ocorridas nos últimos dias. No entanto, uma série de estudos realizados recentemente aponta que existem equívocos nos relatos dos participantes nas pesquisas O/D tradicionais, principalmente em relação à distância e ao tempo dos percursos relatados. Esses estudos apontam a utilização da tecnologia GPS (Global Positioning System) como uma forma confiável para a obtenção de informações sobre cada etapa de viagem. A tecnologia GPS, apesar de suas limitações, está disponível popularmente nos últimos anos e apresenta resultados significativos de registros em tempo real, inclusive de viagens curtas. Dessa forma, foram levantadas as experiências internacionais de estudos de pesquisas O/D segmentadas por etapa de viagem, utilizando a tecnologia GPS. Com base nisso, foi aplicada uma pesquisa de origem e destino na Região Metropolitana de Porto Alegre com GPS e com Entrevistas posteriores. Os estudos estrangeiros apontam que essa é a melhor forma para obtenção dos dados e minimização dos erros. Os dados coletados na pesquisa O/D foram tabulados em um banco de dados e as informações registradas foram tratadas em softwares gráficos gratuítos. Sendo assim, foi possível cruzar os dados relatados pelos participantes na entrevista com os dados registrados pelo aparelho GPS. As análises apontam que todos os indivíduos apresentaram discrepâncias no relato da duração e da distância, em comparação aos dados efetivamente registrados. Essas discrepâncias foram tanto positivas quanto negativas. As implicações dessas diferenças entre os dados relatados e registrados no GPS para fins de modelagem foram vistas nos modelos de escolha modal Logit Multinomial elaborados. O modelo elaborado a partir de dados registrados pelo GPS aponta ajustes apropriados e resultado significativo de variáveis. O modelo elaborado com base nos dados relatados não se comporta como o esperado, conforme as hipóteses previamente estabelecidas, e apresenta variáveis não significativas.Origin and destination surveys are traditionally made from the participants' reports of all trips occurring in the last days, known as Diary Trip. However, a number of recent studies show that there are mistakes in the accounts of participants in traditional origin and destinations surveys, especially in relation to distance and time. These studies point the use of GPS (Global Positioning System) technology as a reliable way to obtain information about each trip leg. GPS technology, despite its limitations, is popularly available in recent years and presents significant results of real-time records, including short trips. Therefore, we surveyed the experiences of international origin and destination studies segmented by leg trip, using GPS technology. Based on this, a origin and destination survey was applied in the metropolitan region of Porto Alegre with GPS and Diary Trip. Foreign studies indicate that this is the best way to obtain the data and minimizing errors. The data collected in the origin and destination survey were tabulated in a database and the information recorded was treated in free graphics software. Therefore, it was possible to cross the data reported by the participants in the Diary Trips with the data recorded by the GPS. The analyzes suggest that all subjects had discrepancies in reporting the duration and distance, compared to the data actually reported. These discrepancies have been both positive and negative. The implications of these differences, between reported and recorded on the GPS data, for modeling, can be seeing in the modal choice model Multinomial Logit elaborate. The model developed from data recorded by the GPS indicates appropriate adjustments and significant outcome variables. The model developed based on reported data does not behave as expected, as previously established hypotheses, and presents no significant variables.
9
Liuxu and Zhang Qishan. "THE DESIGN OF INTERFACE MODULE FOR VENDOR MANAGING SYSTEM BASED ON INTERNET." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605346.
Full textAbstract:
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaWith the high-speed development of IT, the managing method of the vendor has been changed from the manpower management into the network management .The paper discusses the structure of vendor managing system based on Internet. And it introduces the important constitute part of the system in detail, which is called interface module, including the design scheme of hardware and software.
10
Hort, Marek. "Konstrukce GPS přístroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218691.
Full textAbstract:
Aim of this Diploma thesis was to create a device capable of receiving navigational data from GPS. These data are subsequently stored in fixed memory and after connection with the PC are displayed it on the satellite map. The device was realized by using FPGA and GPS module LEA-5s. Description was created in the VHDL language, which was implemented into the circuit. The part of VHDL design was description of PICOBLAZE processor that controls whole system. For displaying and archiving data stored in device was created PC application GPS TRACER. It is able to display stored trace on the satellite map by using Google maps server. For created device were designed and manufactured PCBs, which were manually fitted.
11
Pivnička, Martin. "Uživatelské měřicí moduly pro platformu cRIO." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221294.
Full textAbstract:
This thesis describes design and manufacture of measuring and communication modules for CompactRIO platform. In the first section is described platform from National Instrument suitable for measurement and control technology. There is written more fact about CompactRIO. The second part is focused on description of the hardware requirements needed to construct the module, communication and working modes. The third part describes information about support programs. At the end of third part is describes practical application of input digital card. Next section consists of practical proposal modules (input / output analog module, GPS modulu) and achievements.
12
Horn, Stefan. "Simulations of complex atmospheric flows using GPUs - the model ASAMgpu -." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-187994.
Full textAbstract:
Die vorliegende Arbeit beschreibt die Entwicklung des hochauflösenden Atmosphärenmodells ASAMgpu. Dabei handelt es sich um ein sogenanntes Grobstrukturmodell bei dem gröbere Strukturen mit typischen Skalen von Deka- bis Kilometern in der atmosphärischen Grenzschicht explizit aufgelöst werden. Hochfrequentere Anteile und deren Dissipation müssen dabei entweder explizit mit einem Turbulenzmodell oder, wie im Falle des beschriebenen Modells, implizit behandelt werden. Dazu wurde der Advektionsoperator mit einem dissipativen Upwind-Verfahren dritter Ordnung diskretisiert. Das Modell beinhaltet ein Zwei-Momenten-Schema zur Beschreibung mikrophysikalischer Prozesse. Ein weiterer wichtiger Aspekt ist die verwendete thermodynamische Variable, die einige Vorteile herkömmlicher Ansätze vereint. Im Falle adiabatischer Prozesse stellt sie eine Erhaltungsgröße dar und die Quellen und Senken im Falle von Phasenumwandlungen sind leicht ableitbar. Außerdem können die benötigten Größen Temperatur und Druck explizit berechnet werden. Das gesamte Modell wurde in C++ implementiert und verwendet OpenGL und die OpenGL Shader Language (GLSL) um die nötigen Berechnungen auf Grafikkarten durchzuführen. Durch diesen Ansatz können genannte Simulationen, für die bisher Supercomputer nötig waren, sehr preisgünstig und energieeffizient durchgeführt werden. Neben der Modellbeschreibung werden die Ergebnisse einiger erfolgreicher Test-Simulationen, darunter drei Fälle mit mariner bewölkter Grenzschicht mit flacher Cumulusbewölkung, vorgestellt.
13
O'Connell, Jonathan F. "A dynamic programming model to solve optimisation problems using GPUs." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/97930/.
Full textAbstract:
This thesis presents a parallel, dynamic programming based model which is deployed on the GPU of a system to accelerate the solving of optimisation problems. This is achieved by simultaneously running GPU based computations, and memory transactions, allowing computation to never pause, and overcoming the memory constraints of solving large problem instances. Due to this some optimisation problems, which are currently not solved in an exact manner for real world sized instances due to their complexity, are moved into the solvable realm. The model is implemented to solve, a range of different test problems, where artificially constructed test data is used to ensure good performance even in the worst cases. Through this extensive testing, we can be confident the model will perform well when used to solve real world test cases. Testing of the model was carried out using a range of different implementation parameters in relation to deployment on the GPU, in order to identify both optimal implementation parameters, and how the model will operate when running on different systems. All problems, when implemented in parallel using the model, show run-time improvements compared to the sequential implementations, in some instances up to hundreds of times faster, but more importantly also show high efficiency metrics for the utilisation of GPU resources. Throughout testing emphasis has been placed on GPU based metrics to ensure the wider generic applicability of the model. Finally, the parallel model allows for new problems to be defined through the use of a simple file format, enabling wider usage of the model.
14
Horcher, Andy. "Improving Helicopter Yarding with Onboard GPS." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26678.
Full textAbstract:
Despite its relatively high cost, helicopter yarding has become a common means of timber extraction where site sensitivity, access, or regulations limit the use of less costly alternatives. The high costs associated with helicopter yarding, as well as the desire to expand the application of this system to extract lower value timber, increases the need for innovation to improve the operations.
The cost or benefit of a particular harvest prescription or innovative technique is commonly assessed with a time and motion study. Capturing time study data require additional personnel or an imposition on the operator to record additional information. Onboard GPS can reduce or eliminate the need for additional personnel and/or operator input providing a rapid means of assessing and improving helicopter operations.
This research employed onboard GPS in helicopter yarding to assess the potential of developing time studies using GPS data. Three helicopter models were sampled on a total of nine sites. Three of the sites have both experienced and inexperienced pilot data. Hemispherical canopy images were sampled at three sites. This complement of data permitted the following analysis: assessment of differences between experienced and inexperienced pilots, assessment of canopy cover on hook time, and the development of production models.
The results indicate onboard GPS and the automated processing methods are suitable for creating time study data. Specifically, in all three case studies quantitative results were obtained, analyzed and opportunities for improvement identified. The time penalty suffered from using inexperienced pilots created 64 to 94% additional turn time. Increasing canopy cover correlated with increased hook time at two sites for the zenith angle segment 0 â 15°. Regressions assessing production show distance, slope, and choker delivery to be significant. This research shows the combination of onboard GPS, the automation process, and commonly collected turn information presents a number of opportunities, enabling the assessment of a wide range of helicopter yarding conditions.Ph. D.
15
Jurajda, David. "Modul kombinované globální satelitní navigace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220291.
Full textAbstract:
The thesis objective is design of methodology focused on accuracy measurement in field of GPS/GLONASS receivers. Text is devided into five main parts. The first one is focused on GNSS technology. Second one deals with used coordinate systems and map projections (ETRS89, WGS84, UTM, Gauss-Krüger). Next part discusses statistical methods. Part four is focused on hardware. Then the final part describes experiment realization and obtained data analysis.
16
Kim, Changryol. "A Physical Model Experiment on the Hydrogeologic Applications of GPR." Connect to resource, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1214416561.
Full text
17
Molák, Josef. "Základnová stanice pro agentní platformu WSageNt s využitím GSM modulu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236532.
Full textAbstract:
This master's thesis describes the software and hardware extension of multiagent platform WSageNt to ensure communication between basestation and web interface Control Panel using GSM network. Sensor node FITmote is used as a basestation and modem Teltonika is used as a interface to GSM. The physical interconnection of the devices implementing the newly created bridge to connect different logic voltage levels of their serial interface. Application for basestation was extended to serial communication with modem. This extend provide communication over GSM network to Internet. Application on control server also was modified for TCP/IP communication.
18
Santos, Paulo Carlos Ferreira dos. "Extração de informações de desempenho em GPUs NVIDIA." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-02042013-090806/.
Full textAbstract:
O recente crescimento da utilização de Unidades de Processamento Gráfico (GPUs) em aplicações científicas, que são voltadas ao desempenho, gerou a necessidade de otimizar os programas que nelas rodam. Uma ferramenta adequada para essa tarefa é o modelo de desempenho que, por sua vez, se beneficia da existência de uma ferramenta de extração de informações de desempenho para GPUs. Este trabalho cobre a criação de um gerador de microbenchmark para instruções PTX que também obtém informações sobre as características do hardware da GPU. Os resultados obtidos com o microbenchmark foram validados através de um modelo simplificado que obteve erros entre 6,11% e 16,32% em cinco kernels de teste. Também foram levantados os fatores de imprecisão nos resultados do microbenchmark. Utilizamos a ferramenta para analisar o perfil de desempenho das instruções e identificar grupos de comportamentos semelhantes. Também testamos a dependência do desempenho do pipeline da GPU em função da sequência de instruções executada e verificamos a otimização do compilador para esse caso. Ao fim deste trabalho concluímos que a utilização de microbenchmarks com instruções PTX é factível e se mostrou eficaz para a construção de modelos e análise detalhada do comportamento das instruções.The recent growth in the use of tailored for performance Graphics Processing Units (GPUs) in scientific applications, generated the need to optimize GPU targeted programs. Performance models are the suitable tools for this task and they benefits from existing GPUs performance information extraction tools. This work covers the creation of a microbenchmark generator using PTX instructions and it also retrieves information about the GPU hardware characteristics. The microbenchmark results were validated using a simplified model with errors rates between 6.11% and 16.32% under five diferent GPU kernels. We also explain the imprecision factors present in the microbenchmark results. This tool was used to analyze the instructions performance profile, identifying groups with similar behavior. We also evaluated the corelation of the GPU pipeline performance and instructions execution sequence. Compiler optimization capabilities for this case were also verified. We concluded that the use of microbenchmarks with PTX instructions is a feasible approach and an efective way to build performance models and to generate detailed analysis of the instructions\' behavior.
19
Araya, Yeheyies. "Detecting Swiching Points and Mode of Transport from GPS Tracks." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91320.
Full textAbstract:
In recent years, various researches are under progress to enhance the quality of the travel survey. These researches were mainly performed with the aid of GPS technology. Initially the researches were mainly focused on the vehicle travel mode due to the availability of GPS technology in vehicle. But, nowadays due to the accessible of GPS devices for personal uses, researchers have diverted their focus on personal mobility in all travel modes. This master’s thesis aimed at developing a mechanism to extract one type of travel survey information particularly travel mode from collected GPS dataset. The available GPS dataset is collected for travel modes of walk, bike, car, and public transport travel modes such as bus, train and subway. The developed procedure consists of two stages where the first is the dividing the track trips into trips and further the trips into segments by means of a segmentation process. The segmentation process is based on an assumption that a traveler switches from one transportation mode to the other. Thus, the trips are divided into walking and non walking segments. The second phase comprises a procedure to develop a classification model to infer the separated segments with travel modes of walk, bike, bus, car, train and subway. In order to develop the classification model, a supervised classification method has been used where decision tree algorithm is adopted. The highest obtained prediction accuracy of the classification system is walk travel mode with 75.86%. In addition, the travel modes of bike and bus have shown the lowest prediction accuracy. Moreover, the developed system has showed remarkable results that could be used as baseline for further similar researches.
20
Horn, Stefan [Verfasser], Eberhard [Akademischer Betreuer] Renner, Eberhard [Gutachter] Renner, and Siegfried [Gutachter] Raasch. "Simulations of complex atmospheric flows using GPUs - the model ASAMgpu - : Simulations of complex atmospheric flows using GPUs - the model ASAMgpu - / Stefan Horn ; Gutachter: Eberhard Renner, Siegfried Raasch ; Betreuer: Eberhard Renner." Leipzig : Universitätsbibliothek Leipzig, 2015. http://d-nb.info/1239739745/34.
Full text
21
Veronez, Maurício Roberto. "Proposta de um modelo regional para a redução do efeito sistemático da ionosfera através do método seqüencial de ajustamento." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-28092015-095816/.
Full textAbstract:
O posicionamento de pontos, com o sistema GPS, tornou-se uma ferramenta importante, aplicável nas mais diferentes áreas do conhecimento. No entanto, em algumas situações, a exigência de elevadas precisões trouxe a inconveniência de um custo elevado na aquisição de receptores de dupla freqüência. Mesmo com os avanços tecnológicos, a ionosfera é uma das fontes de erro que mais afetam o posicionamento de pontos. Para os usuários que possuem equipamentos de dupla freqüência, este erro é modelado com grande eficiência através do processamento de dados com solução iono free. No Brasil, a maioria dos usuários possui equipamentos que captam informações apenas do código C/A e/ou código C/A e portadora L1. Neste caso faz-se uso de alguns modelos, como, por exemplo, o de Klobuchar, com redução do erro nos posicionamentos absolutos de, aproximadamente, 50%. Nos posicionamentos relativos, com bases superiores a 20 Km, a utilização deste modelo não é a mais indicada. Neste contexto, este trabalho consiste no desenvolvimento de um método que possibilite modelar o atraso ionosférico através de um polinômio do segundo grau, baseado no ajustamento seqüencial de observações. As informações necessárias para esta modelagem são advindas das estações GPS da Rede Brasileira de Monitoramento Contínuo. Isto possibilita, em posicionamentos absolutos, determinar o atraso ionosférico de uma forma mais eficiente que o obtido pelo modelo de Klobuchar. Em posicionamentos relativos, para os usuários de equipamentos de simples freqüência, tal modelagem permite a geração de um código com características semelhantes ao código P2. Assim, com os dados gerados por receptores de uma freqüência, é possível processar vetores de bases longas por meio da solução iono free code. Os resultados obtidos indicam que tal metodologia pode ser uma alternativa eficiente para minimizar o efeito ionosférico no posicionamento de pontos com o sistema GPS. Horizontalmente, através dos métodos de posicionamento Single Point e relativo, respectivamente, o modelo ionosférico proposto proporcionou uma melhoria de 39% e 26% se comparado com o modelo de Klobuchar.Point positioning, with GPS, became an important tool applicable to the most different areas of the knowledge. However, in some situations, the requirement of high precisions brought the inconvenience of a high cost in the acquisition of dual receivers frequency. Despite of the technological advances, the ionosphere is one of the error sources that affect most point positioning. For users who have dual equipment frequency, this error is modeled with great efficiency through data processing with the ionosphere free solution. In Brazil the majority of the users has equipments that process C/A code information only and/or C/A code and L1 carrier. In this case it is necessary to use some models, for example the Klobuchar model, with error reduction of approximately 50% in absolute point positioning. In the relative positioning, with baselines longer than 20 Km, the use of this model is not indicated. Thus, this work consists in developing a method that makes possible to model the ionospheric delay using a second degree polynomial, based on sequential adjustment of observations. The necessary information for this modeling is obtained from GPS stations that compose the RBMC (Brazilian Network for Continuous Monitoring of GPS). Thus it is possible to determine the ionospheric delay in a more efficient way in absolute positioning than when using the Klobuchar model. In relative positioning, for single frequency users, such modeling allows the generation of a code, with similar characteristics to the P2 code. Hence, with data generated by single frequencies, it is possible to process long base line vectors, using the iono free code solution. The results obtained indicate that such methodology can be an efficient alternative to minimize the ionospheric effect in the GPS point positioning. Horizontally, through the methods of positioning Single Point and relative, respectively, the ionospheric model considered provided an improvement of 39% and 26% if compared with the Klobuchar model.
22
Andersson, Johan Vium. "A Complete Model for Displacement Monitoring Based on Undifferenced GPS Observations." Doctoral thesis, Stockholm : Division of Geodesy, Royal Institute of Technology (KTH), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4794.
Full text
23
Gaffuri, Anne-Lise. "Drosophila melanogaster, as a model system to study the cell biology of neuronal GPCRs." Thesis, Paris 5, 2012. http://www.theses.fr/2012PA05T063.
Full textAbstract:
Le récepteur cannabinoique de type 1 (CB1R) est l’un des récepteurs couplés aux protéines G les plus abondants du cerveau mammifère. CB1R a longtemps été décrit comme un récepteur présynaptique régulant de manière rétrograde la transmission synaptique. Cependant, depuis les vingt dernières années, de nouveaux rôles ont été découverts et il est maintenant clairement admis que l’action des endocannabinoides (eCBs) ne se limite pas à la régulationde la neurotransmission au niveau de synapses adultes déjà établies. En effet, les eCBs et le CB1R sont des acteurs majeurs de l’ensemble des phases du développement cérébral. Cependant, les mécanismes moléculaires impliqués n’ont toujours pas été identifiés. Les mécanismes cellulaires auxquels nous nous intéressons ne dépendant pas de l’environnement cellulaire, nous proposons donc de combiner la puissance génétique du modèle drosophile à l’accessibilité et la haute résolution offerte par la culture primaire de neurones. De plus, le récepteur CB1 ne possédant pas d’orthologue parmi les invertébrés, ce système offre la possibilité d’étudier la biologie du récepteur en s’affranchissant de la machinerie endocannabinoide. Cependant, actuellement, aucun protocole de culture primaire de neurones de drosophile ne permet d’obtenir des cellules hautement différenciées et polarisées à basse densité. Ainsi, nous avons tout d’abord développé, optimisé et validé un nouveau protocole permettant de d’obtenir des neurones fonctionnels, hautement différenciés et polarisés en culture de basse densité. Dans un second temps, nous avons démontré que l’activation durécepteur CB1, exprimé ectopiquement dans les neurones de drosophile, entrainait son internalisation, de manière identique à ce qui avait déjà été observé chez les mammifères. Puis, nous avons étudié l’effet de l’expression et de l’activation ectopique de CB1R sur le développement neuronal chez la drosophile. Ainsi, nous avons démontré que l’activation du récepteur module directement la dendritogénèse. Afin de compléter la caractérisation de notremodèle, nous avons démontré que l’activation transitoire du récepteur dans les corps pédonculés (le centre de la mémoire olfactive chez la drosophile) altérait spécifiquement la formation d’une forme consolidée de mémoire après un conditionnement aversif. En conclusion, la validation du modèle drosophile dans l’étude de la biologie cellulaire durécepteur CB1 ouvre de nouvelles perspectives quant à la détermination des mécanismes moléculaires régissant l’action du récepteur sur le fonctionnement neuronalThe type-1 cannabinoid receptor (CB1R), the neuronal receptor for the major psychoactive substance of marijuana, is one, of the most abundant G-protein coupled receptors in the mammalian central nervous system. CB1R is traditionally described as a presynaptic receptor that retrogradely regulates synaptic transmission. In addition to this now relatively wellcharacterized function, in the last two decades it has become widely recognized that endocannabinoid (eCB) actions in the brain are not limited to the regulation of neurotransmission at established adult synapses. Indeed, eCB and CB1R are now recognized to be involved in brain development at the synaptic, neuronal and network levels. However, precise mechanisms underlying these processes remain poorly described. Since cellular mechanisms that mediate CB1R-activition dependent neuronal remodeling and subneuronal targeting have been demonstrated to be cell-autonomous, we aimed to combine the power of Drosophila genetics with the experimental accessibility and single-cell resolution of lowdensity primary neuronal cultures, a tool currently lacking in Drosophila. Moreover, becauseDrosophila does not have a CB1R ortholog, CB1R cell biology may be observed independently from eCB machinery. Thus, we first developed and validated an in vitro culture protocol that yields mature and fully differentiated Drosophila neurons. Secondly, we showed that activation-dependent endocytosis of ectopically expressed CB1R is conserved in Drosophila neurons. Next, we investigated whether ectopic expression and activation of CB1R in Drosophila modulate neuronal development. As observed in mammals, we observed that activation of CB1R impairs dendritogenesis in a cell-autonomous manner. For further characterization of our model, we showed that, as with mammals, transient ectopic CB1R expression and activation in mushroom body neurons (the center of olfactory memory in Drosophila) modulate the formation of a consolidated form of aversive memory. In conclusion, the validation of this new animal model opens new perspectives to better characterize mechanisms underlying modulation of neuronal functions induced by CB1Ractivity
24
EDWARDS, KARLA ROBERTA LISA. "Site-Specific Point Positioning and GPS Code Multipath Parameterization and Prediction." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1300860715.
Full text
25
Crowell, Brendan W. "Using GPS to Rapidly Detect and Model Earthquakes and Transient Deformation Events." Thesis, University of California, San Diego, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3558086.
Full textAbstract:
The rapid modeling and detection of earthquakes and transient deformation is a problem of extreme societal importance for earthquake early warning and rapid hazard response. To date, GPS data is not used in earthquake early warning or rapid source modeling even in Japan or California where the most extensive geophysical networks exist. This dissertation focuses on creating algorithms for automated modeling of earthquakes and transient slip events using GPS data in the western United States and Japan. First, I focus on the creation and use of high-rate GPS and combined seismogeodetic data for applications in earthquake early warning and rapid slip inversions. Leveraging data from earthquakes in Japan and southern California, I demonstrate that an accurate magnitude estimate can be made within seconds using P wave displacement scaling, and that a heterogeneous static slip model can be generated within 2-3 minutes. The preliminary source characterization is sufficiently robust to independently confirm the extent of fault slip used for rapid assessment of strong ground motions and improved tsunami warning in subduction zone environments. Secondly, I investigate the automated detection of transient slow slip events in Cascadia using daily positional estimates from GPS. Proper geodetic characterization of transient deformation is necessary for studies of regional interseismic, coseismic and postseismic tectonics, and miscalculations can affect our understanding of the regional stress field. I utilize the relative strength index (RSI) from financial forecasting to create a complete record of slow slip from continuous GPS stations in the Cascadia subduction zone between 1996 and 2012. I create a complete history of slow slip across the Cascadia subduction zone, fully characterizing the timing, progression, and magnitude of events. Finally, using a combination of continuous and campaign GPS measurements, I characterize the amount of extension, shear and subsidence in the Salton Trough, one of the most complex zone of active faulting and seismicity in California. I show the implications that faulting in the Salton Trough has for the evolution of the Brawley Seismic Zone, and more importantly, the southern San Andreas fault.
26
Andersson, Anders, and Daniel Hallgren. "Passive Aircraft Altimetry using GPS as a Bistatic Radar : A simulation model." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1958.
Full textAbstract:
A common way to measure height in aerial vehicles is to use a radar height altimeter (RHM). Since the RHM transmits radar pulses that can be detected, a passive alternative would be desirable in military applications. The idea to use reflected signals from the Global Positioning System (GPS) as a bistatic radar, has been established over the last years. The GPS signals are already present and would not reveal aeroplanes in covert operations.
In this thesis, the use of reflected GPS signals as a bistatic, passive altimeter is examined. A simulation model has been developed and implemented, and simulations using the model have been done. Different types of ground cover have been investigated, both water and land types, with varying reflectivity and scattering behaviour. For larger terrain variations, e.g. mountains and valleys, a ground elevation database has been used. Furthermore, several parameters, like the antenna coverage and the satellite elevation angle, have been varied and the result of this examined.
The results of these simulations show that measuring height is possible for bothsea and land surfaces. The accuracy depends on several error factors, like a bias originating from surface roughness and measurement errors due to noise in the receiver. The simulations also show that the most important design parameter is the antenna, which must be designed to give a sufficiently large SNR, capture the specular reflection and avoid unwanted reflections.
27
Klozar, Lukáš. "Lokalizační systém kombinující výhody GPS a GSM." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218628.
Full textAbstract:
Aim of this master´s project is to analyse localization possibilities in GSM and GPS wireless networks. Choise of proper module and design location device for both GPS and GSM networks. Design and construction of system, which is able to designate it´s positron, using both GPS and GSM networks. The location informations, are send to Internet server, using GPRS system. Localization techniques in both wireless network are described. The system which is able to get position information was designed and constructed. The module´s driving software and the software, which process the localization informations and controls the database storing process, was designed.
28
Rahman, Anis Ur. "Face perception in videos : contributions to a visual saliency model and its implementation on GPUs." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT102/document.
Full textAbstract:
Les études menées dans cette thèse portent sur le rôle des visages dans l'attention visuelle. Nous avons cherché à mieux comprendre l'influence des visages dans les vidéos sur les mouvements oculaires, afin de proposer un modèle de saillance visuelle pour la prédiction de la direction du regard. Pour cela, nous avons analysé l'effet des visages sur les fixations oculaires d'observateurs regardant librement (sans consigne ni tâche particulière) des vidéos. Nous avons étudié l'impact du nombre de visages, de leur emplacement et de leur taille. Il est apparu clairement que les visages dans une scène dynamique (à l'instar de ce qui se passe sur les images fixes) modifie fortement les mouvements oculaires. En nous appuyant sur ces résultats, nous avons proposé un modèle de saillance visuelle, qui combine des caractéristiques classiques de bas-niveau (orientations et fréquences spatiales, amplitude du mouvement des objets) avec cette caractéristique importante de plus haut-niveau que constitue les visages. Enfin, afin de permettre des traitements plus proches du temps réel, nous avons développé une implémentation parallèle de ce modèle de saillance visuelle sur une plateforme multi-GPU. Le gain en vitesse est d'environ 130 par rapport à une implémentation sur un processeur multithreadStudies conducted in this thesis focuses on faces and visual attention. We are interested to better understand the influence and perception of faces, to propose a visual saliency model with face features. Throughout the thesis, we concentrate on the question, "How people explore dynamic visual scenes, how the different visual features are modeled to mimic the eye movements of people, in particular, what is the influence of faces?" To answer these questions we analyze the influence of faces on gaze during free-viewing of videos, as well as the effects of the number, location and size of faces. Based on the findings of this work, we propose model with face as an important information feature extracted in parallel alongside other classical visual features (static and dynamic features). Finally, we propose a multi-GPU implementation of the visual saliency model, demonstrating an enormous speedup of more than 132 times compared to a multithreaded CPU
29
Koopman, Fred Andrew. "An assessment of the perception and practices of general practitioners (GPs) in Cape Town regarding problem drinking amongst their patients." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=init_7441_1180442576.
Full textAbstract:
Since the anecdotal assumption is that GPs do not effectively diagnose and manage problem drinking amongst their patients, this study investigated the role of GPs in addressing problem drinking in Cape Town as well as the prevalence of problem drinking amongst their patients.
30
HURD, JOHN K. JR. "A GIS MODEL TO ESTIMATE SNOW DEPTH USING DIFFERENTIAL GPS AND HIGH-RESOLUTION DIGITAL ELEVATION DATA." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1177640172.
Full text
31
Chen, Lili 1975. "Smoothing spline based vector partially linear model estimation and its applications in GPS." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84017.
Full textAbstract:
The partially linear model (PLM) is a flexible extension of both the linear model and nonparametric model of time series. The vector partially linear model (VPLM) is an extension of PLM when there are a set of observations at one time point from several sources. Smoothing spline is one of the popular approaches for PLM estimation. This thesis extends the smoothing spline approach to a few VPLMs and presents algorithms to compute the estimates. Then, we apply the smoothing spline based vector partially linear model (SSBVPLM) approach to Global Positioning System (GPS) applications. In an unfavorable environment, the accuracy of position estimates, which are usually computed by the least squares (LS) method based on the linear model, can be impaired due to system errors. In order to account the system errors, we use the vector partially linear models instead of the linear models. We apply the SSBVPLM estimation techniques to kinematic and static relative positioning, based on both code and carrier phase measurements. The simulations show that the SSBVPLM approach can yield more accurate position estimates than the LS approach.
32
Lawrence, Shawn A. (Shawn Adam) 1975. "Kinematically consistent, elastic block model for the eastern Mediterranean constrained by GPS measurements." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/54506.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2003.Includes bibliographical references (p. 43-59).
I use a Global Positioning System (GPS) velocity field to constrain block models of the eastern Mediterranean and surrounding regions that account for the angular velocities of constituent blocks and elastic strain accumulation on block-bounding faults in the interseismic period. Kinematically consistent fault slip rates and locking depths are estimated by this method. Eleven blocks are considered, including the major plates, based largely on previous geodetic, seismic, and geologic studies: Eurasia (EU), Nubia (NU), Arabia (AR), Anatolia (AN), Caucasus (CA), South Aegea (AE), Central Greece (GR), North Aegea (NE), Southeast Aegea (SE), Macedonia (MA), and Adria (AD). Two models are presented, one in which the best-fitting locking depth for the entire region (-15 km) is used on all boundaries (Model A), and one in which shallower locking depths are used on the Marmara Fault, the Hellenic and Cyprus Arcs, and in the Greater Caucasus (Model B), based on a consideration of locally best-fitting locking depths. An additional block, Black Sea (BS), is postulated in a third model. The models are in fair to good agreement with the results of previous studies of plate motion, fault slip rates, seismic moment rates and paleomagnetic rotations. Notably, some block pairs in the Aegean region have Euler poles on, or near to, their common boundaries, in qualitative agreement with so-called pinned block models, e.g., for the transfer of slip from the right-lateral North Anatolian Fault system to a set of left-lateral and normal faults in central and northern Greece (McKenzie and Jackson, 1983; Taymaz et al., 1991a; Goldsworthy et al., 2002).
(cont.) In addition, roughly three-quarters of the deformation in the Hellenic Arc and Greater Caucasus appears to be aseismic, in approximate agreement with previous studies (Jackson and McKenzie, 1988; Jackson, 1992). Increased data coverage will better constrain block motions, the locations of boundaries and the applicability of this method.
by Shawn A. Lawrence.
S.M.
33
González, Marcos Tulio Amarís. "Performance prediction of application executed on GPUs using a simple analytical model and machine learning techniques." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-06092018-213258/.
Full textAbstract:
The parallel and distributed platforms of High Performance Computing available today have became more and more heterogeneous (CPUs, GPUs, FPGAs, etc). Graphics Processing Units (GPU) are specialized co-processor to accelerate and improve the performance of parallel vector operations. GPUs have a high degree of parallelism and can execute thousands or millions of threads concurrently and hide the latency of the scheduler. GPUs have a deep hierarchical memory of different types as well as different configurations of these memories. Performance prediction of applications executed on these devices is a great challenge and is essential for the efficient use of resources in machines with these co-processors. There are different approaches for these predictions, such as analytical modeling and machine learning techniques. In this thesis, we present an analysis and characterization of the performance of applications executed on GPUs. We propose a simple and intuitive BSP-based model for predicting the CUDA application execution times on different GPUs. The model is based on the number of computations and memory accesses of the GPU, with additional information on cache usage obtained from profiling. We also compare three different Machine Learning (ML) approaches: Linear Regression, Support Vector Machines and Random Forests with BSP-based analytical model. This comparison is made in two contexts, first, data input or features for ML techniques were the same than analytical model, and, second, using a process of feature extraction, using correlation analysis and hierarchical clustering. We show that GPU applications that scale regularly can be predicted with simple analytical models, and an adjusting parameter. This parameter can be used to predict these applications in other GPUs. We also demonstrate that ML approaches provide reasonable predictions for different cases and ML techniques required no detailed knowledge of application code, hardware characteristics or explicit modeling. Consequently, whenever a large data set with information about similar applications are available or it can be created, ML techniques can be useful for deploying automated on-line performance prediction for scheduling applications on heterogeneous architectures with GPUs.As plataformas paralelas e distribuídas de computação de alto desempenho disponíveis hoje se tornaram mais e mais heterogêneas (CPUs, GPUs, FPGAs, etc). As Unidades de processamento gráfico são co-processadores especializados para acelerar operações vetoriais em paralelo. As GPUs têm um alto grau de paralelismo e conseguem executar milhares ou milhões de threads concorrentemente e ocultar a latência do escalonador. Elas têm uma profunda hierarquia de memória de diferentes tipos e também uma profunda configuração da memória hierárquica. A predição de desempenho de aplicações executadas nesses dispositivos é um grande desafio e é essencial para o uso eficiente dos recursos computacionais de máquinas com esses co-processadores. Existem diferentes abordagens para fazer essa predição, como técnicas de modelagem analítica e aprendizado de máquina. Nesta tese, nós apresentamos uma análise e caracterização do desempenho de aplicações executadas em Unidades de Processamento Gráfico de propósito geral. Nós propomos um modelo simples e intuitivo fundamentado no modelo BSP para predizer a execução de funções kernels de CUDA sobre diferentes GPUs. O modelo está baseado no número de computações e acessos à memória da GPU, com informação adicional do uso das memórias cachês obtidas do processo de profiling. Nós também comparamos três diferentes enfoques de aprendizado de máquina (ML): Regressão Linear, Máquinas de Vetores de Suporte e Florestas Aleatórias com o nosso modelo analítico proposto. Esta comparação é feita em dois diferentes contextos, primeiro, dados de entrada ou features para as técnicas de aprendizado de máquinas eram as mesmas que no modelo analítico, e, segundo, usando um processo de extração de features, usando análise de correlação e clustering hierarquizado. Nós mostramos que aplicações executadas em GPUs que escalam regularmente podem ser preditas com modelos analíticos simples e um parâmetro de ajuste. Esse parâmetro pode ser usado para predizer essas aplicações em outras GPUs. Nós também demonstramos que abordagens de ML proveem predições aceitáveis para diferentes casos e essas abordagens não exigem um conhecimento detalhado do código da aplicação, características de hardware ou modelagens explícita. Consequentemente, sempre e quando um banco de dados com informação de \\textit esteja disponível ou possa ser gerado, técnicas de ML podem ser úteis para aplicar uma predição automatizada de desempenho para escalonadores de aplicações em arquiteturas heterogêneas contendo GPUs.
34
O'Connor, Daryl Brian. "An investigation of job strain and sources of occupational stress on mental well-being, and physiological activity in general practitioners." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367009.
Full text
35
Ajmaya, Davi, and Dennis Eklund. "Machine learning based pedestrian event monitoring using IMU and GPS." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-41100.
Full textAbstract:
Understanding the behavior of pedestrians in road transportation is critical to maintain a safe en- vironment. Accidents on road transportation are one of the most common causes of death today. As autonomous vehicles start to become a standard in our society, safety on road transportation becomes increasingly important. Road transportation is a complex system with a lot of dierent factors. Identifying risky behaviors and preventing accidents from occurring requires better under- standing of the behaviors of the dierent persons involved. In this thesis the activities and behavior of a pedestrian is analyzed. Using sensor data from phones, eight dierent events of a pedestrian are classied using machine learning algorithms. Features extracted from phone sensors that can be used to model dierent pedestrian activities are identied. Current state of the art literature is researched to nd relevant machine learning algorithms for a classication model. Two models are implemented using two dierent machine learning algorithms: Articial Neural Network and Hid- den Markov Model. Two dierent experiments are conducted where phone sensor data is collected and classied using the models, achieving a classication accuracy of up to 93%.
36
Cummings, Siobhan Anne. "Desensitisation of the Pituitary Vasopressin Receptor: Development and Use of a Stably-Transfected Model Cell System to Assess the Role of G Protein-Coupled Receptor Kinases." Thesis, University of Canterbury. School of Biological Sciences, 2011. http://hdl.handle.net/10092/5351.
Full textAbstract:
Stress impacts upon all organisms and a robust stress response is required for adaptive interactions of the organism with the environment. In most higher organisms, an individual’s response to stress is mediated by the hypothalamic pituitary adrenal (HPA) axis. Inappropriate regulation of this axis can cause debilitating mental health disorders including depression and anxiety. These disorders can affect an individual’s ability to interact and respond appropriately as different situations arise.
An important component of this axis is the vasopressin V1b receptor (V1bR), which mediates adrenocorticotropin (ACTH) secretion from the anterior pituitary in response to stimulation by arginine vasopressin (AVP). AVP also potentiates the ACTH secretion mediated by corticotropin-releasing hormone type 1 receptor (CRH-R1) in response to corticotropin- releasing hormone (CRH) stimulation. Both the V1bR and CRH-R1 are G protein coupled receptors (GPCRs). A common feature of GPCR signalling is desensitisation of the response following prolonged or repeated exposure to an agonist. Phosphorylation of the receptor is one of the mechanisms of desensitisation. This directly, or indirectly, results in rapid and reversible uncoupling of the receptor from its heterotrimeric guanine nucleotide binding protein (G-protein). Previous research has shown that G protein coupled receptor kinases (GRKs) are key phosphorylators involved in the molecular mechanism of GPCR desensitisation. One of the mains goals of the research carried out in the Mason laboratory is to examine the molecular mechanisms of V1bR desensitisation. The current short term aim is to examine the potential role for GRKs in this mechanism.
It is difficult to study a single receptor type and the molecular mechanisms involved in its regulation in a system larger than a cell based assay. As the proposed method of assessing the involvement of GRKs in desensitisation of the V1bR is to use RNA interference (RNAi) to knock down the expression of the GRKs, primary cell cultures of pituitary corticotrophs are an inappropriate choice. This is due to a number of factors, including the difficulty involved in transfecting primary cells, and the difficulty involved in interpreting the results from primary cell culture experiments as these cultures are composed heterogenous population of cells. Therefore, the main aim of this research was to develop a model cell system from an immortalised cell line, stably-transfected with the V1bR, in which the involvement of GRKs in the molecular mechanism of V1bR desensitisation could be studied. Development of stably-transfected cell lines requires substantial preliminary work and planning in order to produce a successful outcome. Once developed, characterisation of the clonal cell lines is required.
The preliminary work involved determining the cell proliferation rate of the parental cell line, plasmid sub-cloning and production of a large quantity of plasmid DNA, optimisation of the antibiotic selection conditions, and optimisation of the transfection protocol, as well as modification of the inositol phosphate (IP) assay protocol. The V1bR activates the phospholipase Cβ (PLCβ) second messenger signalling pathway in response to stimulation with AVP. This results in the production of IPs and therefore, measurement of IPs in response to AVP stimulation of cells labelled with myo-[³H]inositol can be used as an indicator of functional V1bR expression.
In this research a total of nine clonal cell lines resistant to the antibiotic G418 were generated.
Initial testing of these lines indicated that four probably expressed the V1bR and these were
selected for characterisation in greater detail. All of these four lines showed significantly
increased IP production in response to AVP stimulation (P<0.05; t-test). A significant
decrease in IP production in response to AVP stimulation following an AVP pre-treatment
was also seen with all four lines (P<0.05; t-test). Current evidence therefore suggests that the
V1bR in these clonal cell lines signals and desensitises in the normal way. Although further
characterisation of the clonal cell line is desirable, the data to date indicate that these lines
should be considered to provide an appropriate model system for examining the molecular
mechanisms involved in the regulation of the V1bR. It appears that there are some minor
differences in signalling between the clonal cell lines and therefore this should be a
consideration when deciding which line is most appropriate to use for investigating a
particular question.
37
Habart, Lukáš. "Využití moderních kamerových systémů při analýze silničních nehod." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-232761.
Full textAbstract:
Diploma thesis deals with the possibilities of using video records in analysis road accidents. There are described static and dynamic camera systems. There are also explained the principles of functioning digital cameras and other related terms and associated principles. In this thesis there are compared several types of dynamic cameras, desribed analysis an evaluation procedure. Part of this thesis is to describe the legal issues of recording.
38
Moore, Daniel James. "A Zone-Based Multiple Regression Model to Visualize GPS Locations on a Surveillance Camera Image." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73594.
Full textAbstract:
Surveillance cameras are integral in assisting law enforcement by collecting video information that may help officers detect people for whom they are looking. While surveillance cameras record the area covered by the camera, unlike humans, they cannot "understand" what is happening. My research uses multiple curvilinear regression models to accurately place differentially corrected GPS points with submeter accuracy onto a camera image. Optimal results were achieved after splitting the image into four zones with the focus on calibrating each area separately. This resulted in adjusted R2 values as high as 99.8 percent, indicating that high quality GPS points can form a good manual camera calibration. To ascertain whether or not a lesser quality GPS point associated with a social media application would allow location of the person sending the message, I used an iPhone 5s to do a follow up. Using the zone-based calibration equations on GPS point locations from an iPhone 5s show that the locations collected are less accurate than differentially corrected GPS locations, but there is still a decent chance of being able to locate the correct person in an image based off that person's location. That chance, however, depends on the population density inside the image. Pedestrian density tests show that about 70-80 percent of the phone locations in a low-density environment could be used to locate the correct person that sent a message while 30-60 percent of the phone locations could be used in that manner in a high-density environment.Master of Science
39
Moroney, Gerard. "Utveckling av en ny modul i WM-datas arbetsorderhanteringssystem för registrering av snöröjning respektive sandning." Thesis, Högskolan Dalarna, Datateknik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:du-2865.
Full textAbstract:
WM-data tillhandahåller en lösning för mobil arbetsorderhantering. Lösningen innehåller planeringsverktyg med ärenden, personal och karta och möjlighet att leverera arbetsorder till fältpersonal. Den innehåller dessutom handhållna mobilenheter, vilka fältpersonalen använder för att ta emot aktuella arbetsorder.Vissa kunder önskar ytterligare en modul i denna mobila lösning. Den nya modulen skall användas för att kontinuerligt rapportera in genomförda åtgärder i snöröjningssammanhang.Detta examensarbete går ut på att utveckla den här modulen för att registrera snöröjning respektive sandning. Applikationen exekveras på en PDA, en så kallad Pocket PC med Windows Mobile 5.0. Anledningen till att just Windows Mobile 5.0 skall användas är att detta operativsystem har inbyggt stöd för GPS-positionering. Ett önskemål av WM-data var att detta inbyggda stöd skulle undersökas, rapporteras och användas i applikationen.Resultatet blev en applikation där man via en Pocket PC kontinuerligt sparar undan fordons GPS-position, arbetsåtgärd samt tidpunkterna när GPS-positionerna togs. Denna information är sedan anpassad för att kunna skickas vidare via GPRS till en befintlig databasserver under vissa tidsintervaller.Applikationen utvecklades med hjälp av programmeringsspråket C Sharp (C#) i Visual Studio 2005.
40
Bakhshi, Zanjani Akbar. "Deriving Statewide Freight Truck Flows from Global Positioning System (GPS) Data." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5177.
Full textAbstract:
An accelerated growth in the volume of freight shipped on Florida's highways has led to a significant increase in truck traffic, influencing traffic operations, safety, and the state of repair of highway infrastructure. Traffic congestion in turn has impeded the speed and reliability of freight movement on the highway system. Appropriate planning and decision making processes are necessary to address these issues. However, a main challenge in establishing such processes is the lack of adequate data on statewide freight movements. As traditional data sources on freight movement are either inadequate or no longer available, new sources of data must be investigated.
A recently available source of data on nationwide freight flows is based on a joint venture by the American Transportation Research Institute (ATRI) and the Federal Highway Administration (FHWA) to develop and test a national system for monitoring freight performance measures on key corridors in the nation. This data is obtained from trucking companies who use GPS-based technologies to remotely monitor their trucks. The database contains GPS traces of a large number of trucks as they traveled through the national highway system. This provides unprecedented amounts of data on freight truck movements throughout the nation (and in Florida). Such truck GPS data can potentially be used to support planning, operation, and management processes associated with freight movements. Further, the data can be put to better use when used in conjunction with other freight data obtained from other sources.
The overarching goal of this thesis is to investigate the use of large streams of truck-GPS data from the American Transportation Research Institute (ATRI) for the estimation of statewide freight truck flows in Florida. To this end, first, an algorithm was devised to convert large streams of raw GPS data into a database of truck trips. The algorithm was applied to four months of ATRI's truck-GPS data comprising over 145 Million GPS records to derive a database of more than 1.2 million truck trips starting and/or ending in Florida. This database was used to analyze truck travel characteristics and origin-destination truck flow patterns for different geographical regions in Florida. The resulting database was used in conjunction with the GPS data to analyze the extent to which ATRI's data represents observed truck traffic flows in the state. It was found that at an aggregate level, almost 10% of heavy truck traffic flows in Florida is captured in the ATRI data.
Finally, the database of truck trips derived from ATRI's truck-GPS data was combined with observed heavy truck traffic volumes at different locations within and outside Florida to derive an origin-destination (OD) table of truck flows within, into, and out of the state. To this end, first, the truck trip database developed from ATRI's truck-GPS data was converted into a seed OD table at the TAZ-level spatial resolution used in FLSWM. Subsequently, a mathematical procedure called origin-destination matrix estimation (ODME) method was employed to combine the OD flow table generated from the ATRI data with observed truck traffic volume information at different locations within and outside Florida. The OD table of truck flows estimated from this procedure can be used for a variety of purposes, including the calibration and validation of the heavy truck modeling components of FLSWM.
41
Marques, Artur Pantoja. "Proposta de um programa de gestão de qualidade para uma empresa genérica de posicionamentos com GPS." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-10022009-124605/.
Full textAbstract:
Este trabalho trata da proposta de um Sistema de Gestão da Qualidade para uma empresa genérica prestadora de serviços de posicionamento com o GPS, como alternativa para melhorar a gestão da organização e garantir a qualidade de seus serviços e produtos. O aumento da demanda por esse tipo de serviço estimulou o aparecimento de novas empresas específicas em GPS e adaptação de antigas para atender um mercado crescente e cada vez mais exigente. Por se tratar de um processo novo, sua implantação requer mudanças significativas tanto de ordem técnica (intimamente ligadas ao conhecimento específico do sistema e suas capacidades) como administrativa (meios e políticas que possam garantir uma gestão efetiva de todos os processos envolvidos no posicionamento com o GPS dentro da empresa). A modernização imposta ao setor de topografia e geodésia em seu cenário produtivo e econômico, com o aparecimento de novas técnicas produtivas e ferramentas gerenciais, não pode mais ser protelada. Isso impõe às organizações uma necessidade emergencial de mudança e grandes desafios, entre eles o de sua própria sobrevivência. A execução de um serviço de posicionamento com o sistema GPS consiste em uma seqüência de procedimentos práticos que, se forem bem executados, proporcionarão maior probabilidade de êxito ao resultado final. Os procedimentos dependem muito de cada caso, e normalmente são definidos por indicações dos fabricantes dos instrumentos, normas e especificações oficiais e, na grande maioria das vezes, pela própria experiência prática do responsável. Como parte desse trabalho foi desenvolvida uma pesquisa social para identificar como são e como agem as empresas que prestam serviços de posicionamento com o sistema GPS no Brasil. Com base nos resultados dessa pesquisa, elaborou-se uma empresa genérica de posicionamento com GPS, com características similares à maioria, e que serviu como referência na concepção dos padrões para os processos básicos da empresa. O modelo de gestão da qualidade proposto teve como guia o Sistema da Qualidade preconizado pela ISO série 9000. Consideraram-se também as ferramentas de gestão e controle da qualidade comumente aplicados na indústria de manufatura e adaptados aos serviços de um posicionamento com GPS. O resultado apresenta uma seqüência de implantação do modelo com as devidas recomendações e viabilidades. Para ilustrar, são apresentados os resultados benéficos obtidos com a aplicação direta dos padrões técnicos da empresa genérica, em um posicionamento real para pontos estáticos, em que se considerou apenas a parte produtiva. O resultado mostrou-se bastante convincente.This thesis deals with a proposal for quality management for a generic GPS surveying company as an alternative to management and service quality improvement. As a result of the GPS measurement demand increasing, an important number of new companies and/or renovated ones have been established in order to operate in that market. But considering that it is a new process some changes must be performed in order to accommodate the old surveying techniques and the old fashioned management to the new reality. This implies in a new management organization which must be based on a well described procedure sequence aiming a final quality control success. As an important part of that research a social research has been applied to several Brazilian GPS service provider companies with the purpose of knowing the status of the sector related to the quality management. Based on that research a hypothetical company was considered in order to give subsides to the elaboration of a standardized company. The proposed quality management model was based on the ISO 9000 Quality System adopting management tools and quality control operators applied in the general industry adapted to the GPS surveying companies. This thesis shows the results of that research presenting an implementation model for quality management considering a real surveying GPS work based on the new GPS measurement techniques.
42
Hallmén, Mathias. "Map-Aided GPS Tracking in Urban Areas : Application to Runner Tracking in Sprint Orienteering." Thesis, Linköpings universitet, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121649.
Full textAbstract:
The GPS tracking in sprint orienteering is often a poor supplement to the viewer experience during events taking place in urban areas because of multipath effects. Since the GPS tracking of runners is an important means to making the sport more spectator friendly, it is of interest to make it more accurate. In this thesis project, the information provided by the map of a competition is fused with the GPS tracker position measurements and punch time data in a particle filter to create estimates of the runner trajectories. The map is used to create constraints and to predict motion of runners, as well as to create a model of the GPS reliability depending on map position. A simple observation model is implemented, using the map to decide if a GPS measurement is reliable or not depending on the distance to the closest building. A rather complex motion model is developed to predict the runner motion within the constraints given by the map. The results show that given certain conditions the improvements are vast compared to the traditional GPS tracking. The estimates are bound to possible routes, and they are often very good given that alternative route choices are easily separable. It is however principally difficult to generally improve the tracking using this method. Better measurements or observation models are needed in order to receive a fully satisfying tracking.
43
Spinler, Joshua C. "Investigating Crustal Deformation Associated With The North America-Pacific Plate Boundary In Southern California With GPS Geodesy." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/332879.
Full textAbstract:
The three largest earthquakes in the last 25 years in southern California occurred on faults located adjacent to the southern San Andreas fault, with the M7.3 1992 Landers and M7.1 1999 Hector Mine earthquakes occurring in the eastern California shear zone (ECSZ) in the Mojave Desert, and the M7.2 2010 El Mayor-Cucapah earthquake occurring along the Laguna Salada fault in northern Baja California, Mexico. The locations of these events near to but not along the southern San Andreas fault (SSAF) is unusual in that the last major event on the SSAF occurred more than 300 years ago, with an estimated recurrence interval of 215± 25 years. The focus of this dissertation is to address the present-day deformation field along the North America-Pacific plate boundary in southern California and northern Baja California, through the analysis of GPS data, and elastic block and viscoelastic earthquake models to determine fault slip rates and rheological properties of the lithosphere in the plate boundary zone. We accomplish this in three separate studies. The first study looks at how strain is partitioned northwards along-strike from the southern San Andreas fault near the Salton Sea. We find that estimates for slip-rates on the southern San Andreas decrease from ~23 mm/yr in the south to ~8 mm/yr as the fault passes through San Gorgonio Pass to the northwest, while ~13-18 mm/yr of slip is partitioned onto NW-SE trending faults of the ECSZ where the Landers and Hector Mine earthquakes occurred. This speaks directly to San Andreas earthquake hazards, as a reduction in the slip rate would require greater time between events to build up enough slip deficit in order to generate a large magnitude earthquake. The second study focuses on inferring the rheological structure beneath the Salton Trough region. This is accomplished through analysis of postseismic deformation observed using a set of the GPS data collected before and after the 2010 El Mayor-Cucapah earthquake. By determining the slip-rates on each of the major crustal faults prior to the earthquake, we are able to model the pre-earthquake velocity field for comparison with velocities measured using sites constructed post-earthquake. We then determine how individual site velocities have changed in the 3 years following the earthquake, with implications for the rate at which the lower crust and upper mantle viscously relax through time. We find that the viscosity of the lower crust is at least an order of magnitude higher than that of the uppermost mantle, and hypothesize that this is due to mafic material emplaced at the base of the crust as the spreading center developed beneath the Salton Trough since about 6 Ma. The final study investigates crustal deformation and fault slip rates for faults in the northern Mojave and southern Walker Lane regions of the ECSZ. Previous geodetic studies estimated slip-rates roughly double those inferred via geological dating methods in this region for NW striking strike-slip faults, but significantly smaller than geologic estimates for the Garlock fault. Through construction of a detailed elastic block model, which selects only active fault structures, and applying a new, dense GPS velocity field in this region, we are able to estimate slip-rates for the strike-slip faults in the ECSZ that are much closer to those reported from geology.
44
Al-Soloh, Mohanad, and Arkan Al-Isawi. "Robustness in constructing a network of induced emissions based on GPS-tracking data." Thesis, Högskolan Dalarna, Mikrodataanalys, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:du-25848.
Full textAbstract:
The mobility of people, freight and information is fundamental to economic and social activities such as commuting, manufacturing, distributing consumer goods and supplying energy. There are two major problems that arise as a result of mobility. The first is economic cost and the second is environmental impact which is of increasing concern in sustainable development due to emission levels, particularly as a result of car use. This study focuses on constructing a network of induced emissions (NOIEs) by using three models and checking the robustness of NOIEs under varying parameters and models. The three models are Stead’s model, the NAEI model, and Oguchi’s model. This study uses the Swedish city of Borlänge as the case study. Calculating CO2 emissions by constructing the NOIEs using Stead’s model appears to give an underestimation when compared to results from a NOIEs which applies Oguchi’s model. Results when applying the NAEI model in constructing a NOIEs also give an underestimation compared to a NOIEs applying Oguchi’s model. Applying the NAEI model is, however, more accurate than applying Stead’s model in constructing a NOIEs. The outcomes of this study show that constructing a NOIEs is robust using Oguchi’s model. This model is preferable since it takes into account more important variables such as driving behavior and the length of the road segments which have a significant impact when estimating CO2 emissions.
45
Buonocore, Chiara. "Development of a model to choose the path of cyclists using GPS data collected via smartphone." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17199/.
Full textAbstract:
Nowadays it is impossible being indifferent to the improvement of the urbanization and the mobility and sustainable road infrastructures.It has to be taken into account the bike as a mode of transport for many reasons such as:reduction of pollution and the emissions,safety on the road,less space and healthy.Mostly in big cities,perhaps it is the fastest mode of transport because it's not subject to traffic and its bottlenecks that block the flow.The Netherlands is the most interested country to travel by bike.It's the place where there are more bikes than cars.In recent years the availability of GPS data has seen a marked improvement in terms of accuracy,continuity and quality of data,thanks to the spread of smartphones and applications for auto-location and navigation.The main advantage is to obtain information on the travel routes actually followed by a large sample of cyclists on the entire network, from their origin to their destination.When GPS tracks can be attributed to detailed transport networks, it is possible to evaluate the factors that users consider in the process of choosing a specific route.It's important to study the choice of the route that cyclists make for many reasons.The objective of this thesis is to examine the aspects that the cyclists taking into account when they choose a route instead of another one.We want to focus on the time travelled,considering the average speed per each link and its correspondent length,and the average waiting times at the intersections:how the time influences cyclists choice. This research will investigate which aspects of the bicycle infrastructures have greater or lesser repercussions on the path made by the cyclists and to model their route choices.It will explore the link between the routes chosen by the cyclists and some attributes of the transport network of the Netherlands.The chosen routes will be compare with the fastest and the shortest calculated thanks to the network analyst in ArcMap for each OD pair.
46
Betaille, David Francois. "Assessment and improvement of the capabilities of a window correlator to model GPS multipath phase errors." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446495/.
Full textAbstract:
This thesis is concerned with the modelling of Global Positioning System (GPS) phase multipath. GPS is increasingly used for very high precision (centimetre level) engineering surveying applications such as setting out on construction sites and the control of major civil engineering plant (e.g. bulldozers, graders and pavement layers). In such applications the phase of the carrier signal is the basic observable and the dominant error source is muldpath (electromagnetic reflections of the carrier waves from surfaces in the surroundings of the antennas). The work contained in the thesis has been carried out in collaboration with the LCPC (Laboratoire Central des Ponts et Chaussees) in Nantes, France, which made available its test facility and Leica Geosystems, Heerbrugg, Switzerland, a GPS manufacmrer, which funded the work and which made available modified equipment for testing. The specific subject of the research is the assessment and improvement of the capabilities of a Phase Multipath Mitigation Window correlator (PMMW) to model GPS multipath phase errors. The phase window correlator is a new sampling technique dedicated to the estimation of multipath errors in phase measurements. The thesis contains background material on GPS multipath mitigation and on several existing patents related to the PMMW technique. The main contribution of the work relates to:The rigorous mathematical modelling of multipath, starting from the physics of the phenomenon, right through to the phase measurement process itself, particularly that based on the PMMW correlator. The design of a general testing methodology in a controlled environment to assess the efficacy of multipath mitigation techniques. The carrying out of full-scale experiments at the LCPC in both static and kinematic modes and the assessment of the performances and limitations of the PMMW correlator. Initial investigations into the design of a new real-time correction strategy for phase multipath phase errors based on a combination of multipath observables including the signal-to-noise ratio, the output from the PMMW correlator and an estimation of the code multipath errors from dual frequency phase data. A key feature of the new strategy is its ability to overcome the major limitation of the PMMW technique, i.e. its insensitivity to multipath caused by very close reflectors. It enables the multipath corrupted phase measurements to be improved by 10 % in average in this case, whereas the PMMW corrections on their own had almost no effect.
47
Robidoux, Jeff. "Real-Time Spatial Monitoring of Vehicle Vibration Data as a Model for TeleGeoMonitoring Systems." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32426.
Full textAbstract:
This research presents the development and proof of concept of a TeleGeoMonitoring (TGM) system for spatially monitoring and analyzing, in real-time, data derived from vehicle-mounted sensors. In response to the concern for vibration related injuries experienced by equipment operators in surface mining and construction operations, the prototype TGM system focuses on spatially monitoring vehicle vibration in real-time. The TGM vibration system consists of 3 components: (1) Data Acquisition Component, (2) Data Transfer Component, and (3) Data Analysis Component. A GPS receiver, laptop PC, data acquisition hardware, triaxial accelerometer, and client software make up the Data Acquisition Component. The Data Transfer Component consists of a wireless data network and a data server. The Data Analysis Component provides tools to the end user for spatially monitoring and analyzing vehicle vibration data in real-time via the web or GIS workstations. Functionality of the prototype TGM system was successfully demonstrated in both lab and field tests. The TGM vibration system presented in this research demonstrates the potential for TGM systems as a tool for research and management projects, which aim to spatially monitor and analyze data derived from mobile sensors in real-time.Master of Science
48
Hellström, Nils. "Fleet Management Services in GSM-modules." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8539.
Full textAbstract:
This report studies a low cost hardware platform for Fleet Management Services, FMS. The platform manages vehicle data, positioning and wireless communication. The core of the platform is a new kind of ‘intelligent’ GSM modem, called a GSM module. A GSM module is basically a stripped down mobile phone that allows embedded third party application code and has an IP-stack. The report reviews the modules available on the market today and presents experiences from the implementation of a prototype based on the Aplicom A12 module. The main conclusion is that the concept is feasible though the modules' limited performance must be considered in the design.
49
Loy, James Michael. "RELATING NATURALISTIC GLOBAL POSITIONING SYSTEM (GPS) DRIVING DATA WITH LONG-TERM SAFETY PERFORMANCE OF ROADWAYS." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1078.
Full textAbstract:
This thesis describes a research study relating naturalistic Global Positioning System (GPS) driving data with long-term traffic safety performance for two classes of roadways. These two classes are multilane arterial streets and limited access highways. GPS driving data used for this study was collected from 33 volunteer drivers from July 2012 to March 2013. The GPS devices used were custom GPS data loggers capable of recording speed, position, and other attributes at an average rate of 2.5 hertz.
Linear Referencing in ESRI ArcMAP was performed to assign spatial and other roadway attributes to each GPS data point collected. GPS data was filtered to exclude data with high horizontal dilution of precision (HDOP), incorrect heading attributes or other GPS communication errors.
For analysis of arterial roadways, the Two-Fluid model parameters were chosen as the measure for long-term traffic safety analysis. The Two-Fluid model was selected based on previous research which showed correlation between the Two-Fluid model parameters n and Tm and total crash rate along arterial roadways. Linearly referenced GPS data was utilized to obtain the total travel time and stop time for several half-mile long trips along two arterial roadways, Grand Avenue and California Boulevard, in San Luis Obispo. Regression between log transformed values of these variables (total travel time and stop time) were used to derive the parameters n and Tm. To estimate stop time for each trip, a vehicle “stop” was defined when the device was traveling at less than 2 miles per hour. Results showed that Grand Avenue had a higher value for n and a lower value for Tm, which suggests that Grand Avenue may have worse long-term safety performance as characterized by long-term crash rates. However, this was not verified with crash data due to incomplete crash data in the TIMS database. Analysis of arterial roadways concluded by verifying GPS data collected in the California Boulevard study with sample data collected utilizing a traditional “car chase” methodology, which showed that no significant difference in the two data sources existed when trips included noticeable stop times.
For analysis of highways the derived measurement of vehicle jerk, or rate of change of acceleration, was calculated to explore its relationship with long-term traffic safety performance of highway segments. The decision to use jerk comes from previous research which utilized high magnitude jerk events as crash surrogate, or near-crash events. Instead of using jerk for near-crash analysis, the measurement of jerk was utilized to determine the percentage of GPS data observed below a certain negative jerk threshold for several highway segments. These segments were ¼-mile and ½-mile long. The preliminary exploration was conducted with 39 ¼-mile long segments of US Highway 101 within the city limits of San Luis Obispo. First, Pearson’s correlation coefficients were estimated for rate of ‘high’ jerk occurrences on these highway segments (with definitions of ‘high’ depending on varying jerk thresholds) and an estimate of crash rates based on long-term historical crash data. The trends in the correlation coefficients as the thresholds were varied led to conducting further analysis based on a jerk threshold of -2 ft./sec3 for the ¼-mile segment analysis and -1 ft./sec3 for the ¼-mile segment analysis. Through a negative binomial regression model, it was shown that utilizing the derived jerk percentage measure showed a significant correlation with the total number of historical crashes observed along US Highway 101. Analysis also showed that other characteristics of the roadway, including presences of a curve, presence of weaving (indicated by the presence of auxiliary lanes), and average daily traffic (ADT) did not have a significant correlation with observed crashes. Similar analysis was repeated for 19 ½-mile long segments in the same study area, and it was found the percentage of high negative jerk metric was again significant with historical crashes. The ½-mile negative binomial regression for the presence of curve was also a significant variable; however the standard error for this determination was very high due to a low sample size of analysis segments that did not contain curves.
Results of this research show the potential benefit that naturalistic GPS driving data can provide for long-term traffic safety analysis, even if data is unaccompanied with any additional data (such as live video feed) collected with expensive vehicle instrumentation. The methodologies of this study are repeatable with many GPS devices found in certain consumer electronics, including many newer smartphones.
50
Zhao, Xiaoyun. "Road network and GPS tracking with data processing and quality assessment." Licentiate thesis, Högskolan Dalarna, Mikrodataanalys, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:du-17354.
Full textAbstract:
GPS technology has been embedded into portable, low-cost electronic devices nowadays to track the movements of mobile objects. This implication has greatly impacted the transportation field by creating a novel and rich source of traffic data on the road network. Although the promise offered by GPS devices to overcome problems like underreporting, respondent fatigue, inaccuracies and other human errors in data collection is significant; the technology is still relatively new that it raises many issues for potential users. These issues tend to revolve around the following areas: reliability, data processing and the related application. This thesis aims to study the GPS tracking form the methodological, technical and practical aspects. It first evaluates the reliability of GPS based traffic data based on data from an experiment containing three different traffic modes (car, bike and bus) traveling along the road network. It then outline the general procedure for processing GPS tracking data and discuss related issues that are uncovered by using real-world GPS tracking data of 316 cars. Thirdly, it investigates the influence of road network density in finding optimal location for enhancing travel efficiency and decreasing travel cost. The results show that the geographical positioning is reliable. Velocity is slightly underestimated, whereas altitude measurements are unreliable.Post processing techniques with auxiliary information is found necessary and important when solving the inaccuracy of GPS data. The densities of the road network influence the finding of optimal locations. The influence will stabilize at a certain level and do not deteriorate when the node density is higher.