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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
321

Gras development, approval and implementation in Australia

Ely, William Stewart, Surveying & Spatial Information Systems, Faculty of Engineering, UNSW January 2006 (has links)
This Thesis covers the development of an alternative Global Navigation Satellite System (GNSS) augmentation technology that has become known as the Ground-based Regional Augmentation System (GRAS). GNSS augmentation technologies in support of aviation have largely been developed by countries with large economies such as the USA and members of the European Union. These technologies have focussed on solutions to the specific problems of the host nations, based on the demographics, political and economic factors relevant to them. Outside these countries, the role of GNSS augmentation has largely been ignored, specifically when considering wide area augmentation utilising Satellite Based Augmentation Systems (SBAS). SBAS technologies are expensive, and cannot be justified for nations like Australia with a relatively small number of aircraft, operated in a focussed geographic area. Utilising SBAS services provided by another country introduces cultural, legal and institutional issues that are not always easily addressed. GRAS was derived to provide a cost-effective wide area augmentation capability to nations that lacked the economic ability to field SBAS technologies. This work covers the evolution of the GRAS concept, the construction and testing of the GRAS test bed and its associated test avionics, as well as the development of standards needed to support GRAS as an internationally accepted aviation standard. The major outcome from this work was the confirmation that GRAS could meet the Required Navigation Performance (RNP) standards for Approaches with Vertical Guidance Level 2 (APV-II) as well as all less demanding modes of flight. Results from numerous ground and flight tests conducted under this research program have been reviewed by the International Civil Aviation Organisation (ICAO) GNSS Panel (GNSSP), and been instrumental in the development and validation of Standards and Recommended Practices (SARPs) which promulgate how ICAO standardised systems should perform. The final component of this work describes the project management and technology approval processes needed to get an internationally standardised system into operational use, and the particular problems that a small country like Australia has in progressing these tasks on the World stage.
322

How Nelo´s image is perceived in Germany : An empirical investigation amongst their agents

Bektesevic, Alisa, Oloya, Grace, Schöblom, Tom January 2009 (has links)
<p> </p><p>The purpose of this research was to investigate how the German market is segmented and what the German consumers perceive of Nelo’s positioning by assessment of what the Agents corroborate. The insights derived from it points out if Nelo’s image is rightly perceived in the German market.</p><p> </p><p>In this paper a qualitative approach is used. Data collection method used was both interviews and documentation. Telephone interviews were conducted with three different agents operating in southern Germany. The secondary data the authors used were articles and books. Since it is a research based on a qualitative approach, the theories and the findings will be synthesized to make implication regarding the study.</p><p> </p><p>The investigation has shown that the target segment for Nelo in Germany are the middle to high income group in the age 40+, but it is shown that the products offered by Nelo don’t attract this segment in southern Germany. Though product quality is good the design and material used, does not fit with the target customer rendering the brand unknown. Nelo is not well positioned in the target market because it has not been successful in communicating a clear image. To conclude Nelo´s position is not consistent with their image.</p><p> </p>
323

Support System for Landing with an Autonomous Unmanned Aerial Vehicle

Östman, Christian, Forsberg, Anna January 2009 (has links)
<p>There are a number of ongoing projects developing autonomous vehicles, both helicopters and airplanes. The purpose of this thesis is to study a concept for calculating the height and attitude of a helicopter. The system will be active during landing. This thesis includes building an experimental setup and to develop algorithms and software.</p><p>The basic idea is to illuminate the ground with a certain pattern and in our case we used laser pointers to create this pattern. The ground is then filmed and the images are processed to extract the pattern. This provides us with information about the height and attitude of the helicopter. Furthermore, the concept implies that no equipment on the ground is needed. With further development the sensor should be able to calculate the movement of the underlying surface relative to the helicopter. This is very important when landing on a moving surface, e.g. a ship at sea.</p><p>To study the concept empirically an experimental setup was constructed. The setup provides us with the necessary information to evaluate how well the system could perform in reality. The setup is built with simple and cheap materials. In the setup an ordinary web camera and laser pointers that are avaliable for everyone have been used.</p> / <p>Det finns flera pågående projekt inom autonomflygande farkoster, både för helikoptrar och flygplan. Syftet med vårt examensarbetet är att undersöka ett koncept för en landningssensor för autonom landning med helikopter. Examensarbetet innebär att bygga en fysisk modell för test av konceptet samt att utveckla mjukvara.</p><p>Konceptet för sensorn består av att belysa marken med ett speciellt mönster, i vårt fall skapas mönstret av laserpekare, som därefter fotograferas och bildbehandlas. Detta mönster ger sedan information om helikopterns höjd och attityd i luften. Vidare innebär konceptet också att ingen markutrustning krävs för att sensorn ska fungera. I förlängningen ska man med detta koncept kunna beräkna hur underlaget rör sig relativt helikoptern, vilket är väldigt viktigt vid landning på objekt som rör sig, till exempel ett fartyg.</p><p>För att undersöka hur bra sensorn presterar i verkligheten så har en rigg byggts. Riggen är byggd med enkla och billiga material. I det här fallet används en webbkamera och laserpekare som går att köpa i vanliga elektronikaffärer.</p>
324

Positionering för överlevnad? : - en kvalitativ studie om nystartade företags arbete med sin positionering

Björk, Linnea, Andersson, Kerstin January 2007 (has links)
<p>Purpose:</p><p>Only 60 percent of the newly started companies survive their three first years. The purpose of this report is to obtain a deeper understanding regarding how newly started companies work with their positioning and if there are some kind of a relationship between positioning and the survival rate of newly started companies.</p><p>Research questions:</p><p>Do newly started companies know what position is? Do they incorporate positioning in their day to day marketing?</p><p>Approach:</p><p>We have used a hypothetical-deductive way of reasoning and a qualitative study to gather the information needed. We have through interviews asked our questions to six newly started companies in three different cities.</p><p>Findings:</p><p>In our essay, we reached the conclusion that newly started companies do not spend sufficient time or energy on positioning their products. The companies interviewed only market their product as a good product. They did not highlight or position the product as having additional benefits in comparison to similar products and the companies included in our study did not have a positioning strategy.</p><p>Conclusions:</p><p>We would like to advice all newly started companies to look into the competitive advantages they can gain through their positioning. We would also advice them to develop a positioning strategy giving them a clearer understanding of how to communicate their uniqueness to their customers.</p><p>Value of research:</p><p>Only 60 percent of the newly started companies survive their three first years. In our study we researched newly started companies work with positioning and we looked at the relationship between positioning and the survival rate among newly started companies. Our conclusion in this study is that the companies did not have a positioning strategy. This can be one reason why the survival rate among newly started companies is so low and we find this interesting issue for further research.</p><p>Key words:</p><p>positioning, marketing, newly started companies</p>
325

The Design & User Experiences of a Mobile Location-awareness Application: Meet App

Westerlund, Markus January 2010 (has links)
<p>This paper intends to describe the work and result of the design project Meet App. Meet App lets users interact around their current locations in a direct manner. The user experience is evaluated to get an understanding of the usefulness and interaction with this type of design. The project is related to the context-awareness research field where findings put the project in a greater whole. The result indicates usefulness and enjoyment interacting with the application, but because of the low number of participants the findings cannot be validated.</p>
326

GPS : Nätverks-RTK eller RTK med Fast referensstation i Vänersborgs kommun

Bjarneskär, Anneli, Eriksson, Eva January 2003 (has links)
No description available.
327

Near real-time precise orbit determination of low earth orbit satellites using an optimal GPS triple-differencing technique

Bae, Tae-Suk, January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 174-186).
328

Least-squares variance component estimation : theory and GPS applications /

Amiri-Simkooei, AliReza, January 2007 (has links)
Originally presented as the author's thesis (doctoral)--Delft University of Technology. / Includes bibliographical references (p. [185]-194) and index.
329

Hull/Mooring/Riser coupled motion simulations of thruster-assisted moored platforms

Ryu, Sangsoo 17 February 2005 (has links)
To reduce large motion responses of moored platforms in a harsh environment in deep waters, a thruster-assisted position mooring system can be applied. By applying the system, global dynamic responses can be improved in terms of the mooring line/riser top tensions, operational radii, and the top and bottom angle of the production risers. Kalman filtering as an optimum observer and estimator for stochastic disturbances is implemented in the developed control algorithm to filter out wave frequency responses. Investigation of the performance of thruster-assisted moored offshore platforms was conducted in terms of six-degree-of-freedom motions and mooring line/riser top tensions by means of a fully coupled hull/mooring/riser dynamic analysis program in the time domain and a spectral analysis. The two cases, motion analyses of a platform with thrusters and without thrusters, are extensively compared. The numerical examples illustrate that for deepwater position-keeping of platforms a thruster-assisted moored platform can be an effective solution compared to a conventionally moored platform.
330

Positionering för överlevnad? : - en kvalitativ studie om nystartade företags arbete med sin positionering

Björk, Linnea, Andersson, Kerstin January 2007 (has links)
Purpose: Only 60 percent of the newly started companies survive their three first years. The purpose of this report is to obtain a deeper understanding regarding how newly started companies work with their positioning and if there are some kind of a relationship between positioning and the survival rate of newly started companies. Research questions: Do newly started companies know what position is? Do they incorporate positioning in their day to day marketing? Approach: We have used a hypothetical-deductive way of reasoning and a qualitative study to gather the information needed. We have through interviews asked our questions to six newly started companies in three different cities. Findings: In our essay, we reached the conclusion that newly started companies do not spend sufficient time or energy on positioning their products. The companies interviewed only market their product as a good product. They did not highlight or position the product as having additional benefits in comparison to similar products and the companies included in our study did not have a positioning strategy. Conclusions: We would like to advice all newly started companies to look into the competitive advantages they can gain through their positioning. We would also advice them to develop a positioning strategy giving them a clearer understanding of how to communicate their uniqueness to their customers. Value of research: Only 60 percent of the newly started companies survive their three first years. In our study we researched newly started companies work with positioning and we looked at the relationship between positioning and the survival rate among newly started companies. Our conclusion in this study is that the companies did not have a positioning strategy. This can be one reason why the survival rate among newly started companies is so low and we find this interesting issue for further research. Key words: positioning, marketing, newly started companies

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